HomeMy WebLinkAbout; Sewer Maintenance Acces Road Shoreline Protection; North Agua Hedionda Interceptor Western Segment; 2004-05-01Western Segment
Sewer Maintenance, Access Road & Shoreline Protection Project
AY 2 0 0 4
PREPARED FOR:
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
PREPARED BY:
Dudek & Associates, Inc.
605 Third Street
Encinitas, CA 92024,
4ft
BIOLOGICAL ASSESSMENT
for
NORTH AGLA HEDIONDA INTERCEPTOR
WESTERN SEGMENT
SEWER MAINTENANCE, ACCESS ROAD AND
SHORELINE PROTECTION PROJECT
Prep^ared for:
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
Contact: Mark Biskup^
Tel. (760) 602-2763
Prefpared by:
DUDEK
& ASSOCIATES, INC,
Professional Teams for Complex Projects
605 Third Street
Encinitas, CA 92024
Contact: Vifpul Joshi
Tel. (760) 942-5147
NAY 2004
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Biological Assessment
NAHI West - Sewer Maintenance, Access Road, and Shoreline
Protection Project
TABLE or CONTENTS
Section Page No.
3.0
4.0
4i
5.0
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EXECUTIVE SUMMARY IV
1.0 INTRODUCTION 1
1.1 Purpose and Need ^
1.2 Project Location ^
1.3 Project Description ^
2.0 CONSULTATION REQUIRED TO SATISFY FEDERAL ENDANGERED
SPECIES .8
SPECIES OF CONCERN ^
3.1 Federally Proposed and Listed Species Potentially Occurring in the Project
Area ^
3.2 Literature Review
3.3 Informal Consultation With Public Agency Personnel 10
METHODS ^1
4.1 Botanical Resources ^ ^
4.2 Zoological Resources ^2
4.3 Sensitive and/or Regulated Resources 12
4.4 Assessment of Direct, Indirect, and Cumulative Impacts 14
5.1.1
5.1.2
ENVIRONMENTAL SETTING 14
5.1 General Biota
Botany
Zoology 25
5.1.2.1 Birds 25
5.1.2.2 Reptiles and Amphibians 26
5.1.2.3 Mammals 26
5.1.2.4 Invertebrates 26
5.2 Sensitive Resources 27
5.2.1 Sensitive Plant Species 27
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TABLE OE CONTENTS {Cent:)
Section Page No.
5.2.2 Sensitive Animal Species 28
5.3 Regional Resource Planning Context 29
6.0 RESULTS 32
6.1 California Gnatcatcher 32
6.2 Direct Impacts 40
6.3 Indirect Impacts 40
6.4 Cumulative Impacts 40
7.0 MEASURES TO AVOID, MINIMIZE AND MITIGATE IMPACTS 41
7.1 Avoidance and Minimization 41
7.2 Specific Mitigation Measures for California Gnatchatcher 42
8.0 ACKNOWLEDGMENTS 45
99.0 LITERATURE CITED 45
APPENDICES
Appendix A Vascular Plant Species
Appendix B Wildhfe Species
Appendix C Sensitive Species Categories
Appendix D Habitat Restoration Plan
LIST OE EIGLRES
Figure 1 Regional Map 3
Figure 2 Vicinity Map 4
Figure 3 Project Components 5
Figures 4A-E Biological Resources and Jurisdictional Delineation Maps 15-19
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Figure 5 Regional Vegetation and Species, Proposed FPA Flard/ Soft Lines and
Critical Habitat Map 30
Figures 6A-E Biological Resources and Jurisdictional Delineation Maps with Limits of
Permanent and Temporary Impacts 33-37
Figure 7A Sewer Access Road Typical Section with Cribwall 38
Figure 7B Sewer Access Road Typical Section with 2:1 cut Slope & Culvert 39
Figure 8A Proposed Habitat Creation 43
Figure 8B Proposed habitat Creation Area 44
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EXECUTIVE SUMMARY
This document addresses the potential direct, indirect, and cumulative impacts to the
federally-listed threatened coastal CaHfornia gnatcatcher {Polioptik californica californica)
and its habitat at North Agua Hedionda Interceptor Sewer Maintenance, Access Road,
and Shoreline Protection, Western Segment (NAHI West) project site. This document
includes a discussion of the project setting, study methodology, impacts and proposed
mitigation measures.
Proiect Description
The proposed NAHI West project is located along the northern shore of Agua Hedionda
Lagoon in the City of Carlsbad, CaHfornia. The proposed project consists of six
components: (1) re-establishment of the sewer maintenance access road; (2) construction
of a shoreline protection wall; (3) sewer pipeline improvements; (4) rehabilitation of
existing manholes; (5) future maintenance and operation activities for the sewer pipeline
facilities; and (6) development of a portion of the regional trail system. The first three
components of the project require construction activities within areas of existing native
and non-native vegetation communities. The rehabilitation of manholes, future
maintenance and operations activities, and trail use would occur within the reestablished
access road.
Summary of Findings, Impacts and Proposed Mitigation
This document contains a detailed description of the federally-listed threatened coastal
California gnatcatcher and its habitat as it pertains to the NAHI West project, as weU as
detailed mitigation measures proposed by the City of Carlsbad. Potential cumulative
impacts to this Hsted species and its habitat are also discussed. Together, the proposed
mitigation measures comprise a complete mitigation package that would fully
compensate for all potential direct, indirect and cumulative impacts to the CaHfornia
gnatcatcher and its habitat associated with implementation of the NAHI West project.
The NAHI West project does not occur within United States Fish and Wildlife Service
(USFWS) designated critical habitat for the federally-listed threatened California
gnatcatcher. Suitable habitat occurring on the project site for California gnatcatcher
includes 9.0 acres of coastal sage scrub. Of this, 0.3 acre would be permanently impacted
by the proposed development, 0.74 acre would be temporarily impacted and the
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remaining 7.9 acres would be avoided. As a public infrastructure project within the
proposed Focused Planning Area (FPA), the City of Carlsbad's Draft Habitat Management
Plan (HMP) allows for impacts to covered habitats and species but also requires
mitigation.
Dudek and Associates, Inc. (Dudek) biologists conducted focused surveys for the coastal
CaHfornia gnatcatcher under federal permit number TE-781084. Dr. Anita M. Hayworth
conducted surveys in March and April, 1999; JuHe Vanderwier conducted surveys in
September and October, 2001. During both sets of surveys, two pairs of CaHfornia
gnatcatcher were observed within the NAHI West project corridor.
The project would result in the permanent loss of 0.30 acre of coastal sage scrub. This
impact would be mitigated through the creation of like-habitat within the Agua Hedionda
Lagoon area at a ratio of 1:1 and through either habitat preservation at a ratio of 1:1
within the Lake Calavera mitigation bank or through the creation of additional like-
habitat within the Agua Hedionda Lagoon area at a ratio of 1:1. The total mitigation for
permanent impacts to coastal sage scrub shaH consist of 0.60 acre, or a 2:1 mitigation
ratio. The project may also temporarily impact up to 0.74 acre of coastal sage scrub.
These impacts shaU be mitigated through onsite restoration of aH impact areas at a ratio
of 1:1.
Potential noise impacts during construction would be avoided through restriction of
project noise levels to below 60 dBA at coastal California gnatcatcher nest sites during the
February 15 - August 30 breeding season. Habitat clearing would be restricted to outside
the breeding season to protect nest sites and nesting activity. Long-term indirect impacts
would be reduced through implementation of sewer maintenance and operation
guidelines and a trail maintenance and monitoring program that minimizes potential
future disturbance to habitat and to wildlife activity.
In summary, the proposed project and mitigation plan described in detail in this
document would provide benefits through the conservation of existing CaHfornia
gnatcatcher habitat and potential habitat in a configuration that would contribute to the
regional conservation of the species. The proposed mitigation plan would fully
compensate for the direct, indirect and cumulative impacts of the NAHI West project.
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1.0 INTRODUCTION
This document addresses the potential direct, indirect, and cumulative impacts to the
federally-listed threatened coastal California gnatcatcher {Polioytila californica californica)
and its habitat within the North Agua Hedionda Interceptor (NAHI) West project site.
This document includes a detailed discussion of the project setting, study methodology,
impacts and proposed mitigation measures to reduce impacts. Suitable habitat on the
project site for the California gnatcatcher includes 9.0 acres of coastal sage scrub. Of this,
0.3 acre would be permanently impacted by the proposed development, 0.8 acre would be
temporarily impacted, and 7.9 acres would be avoided.
Detailed discussions of the project setting, alternatives considered and analyzed, general
impacts, and conceptual mitigation measures are provided in the Biological Resources
Technical Report (Dudek 2004) and the Draft Environmental Impact Report (City of
Carlsbad 2004). Information from these documents is incorporated herein as appropriate.
1.1 Purpose and Need
The North Agua Hedionda Interceptor (NAHI) is a 24-inch diameter vitrified clay pipe
gravity sewer, constructed by the City in 1965, along the north shore of Agua Hedionda
Lagoon. Agua Hedionda Lagoon is a tidal, saltwater lagoon owned by San Diego Gas &
Electric (SDG&E). The northern shoreline, however, is under private ownership mainly
held by individuals. The NAHI sewer pipeline runs west from the intersection of El
Camino Real and Cannon Road, across Agua Hedionda Creek, along the north shore of
Agua Hedionda Lagoon to an existing pump station (Foxes Lift Station) immediately east
of Interstate 5 (1-5). The pump station conveys wastewater in a pipeline under 1-5 and
the NAHI sewer flows westerly an additional 2,000 feet, approximately, to its termination
into a larger interceptor paraUeling the railroad right-of-way. The western segment of the
NAHI sewer pipeline, as defined for this project, includes the portion extending from
manhole number 25, located at Cove Drive, north westward to the Foxes Hft station; this
pipeline segment is approximately 3,800 linear feet in length.
While the 39-year old NAHI sewer pipeline is considered in good condition, the original
unpaved sewer maintenance access road has deteriorated significantly due to wave, water,
and wind driven erosion. In addition, a portion of the sewer line is exposed, several
manholes are in need of rehabilitation, a portion of the Hne has been made inaccessible
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due to construction of a private voHeybaU court and driveway, and service is not
established to two parcels on the alignment. The purposes of this project are to restore
and stabilize the access road to avert further undermining and/or erosion, to aUow routine
sewer maintenance, cleaning, rehabilitation and emergency repairs without deleterious
environmental impacts, to provide sewer service to existing and planned development
along the alignment, and to provide a portion of the regional trail system. The proposed
project consists of six components: (1) re-establishment of the sewer maintenance access
road; (2) construction of a shoreline protection waU; (3) sewer pipeHne improvements;
(4) rehabilitation of existing manholes; (5) future maintenance and operation activities
for the sewer pipeline facilities; and (6) development of a portion of the regional trail
system.
1.2 Project Location
The proposed project site is situated along the northern shore of Agua Hedionda Lagoon
in the City of Carlsbad, California {Figure 1). The project begins in the north at the Foxes
lift station, and foUows the shoreline a short distance west but primarily south and east to
the southem terminus of Cove Drive. The property lies within the southwestern quarter
of the U.S. Geological Survey San Luis Rey, California 7.5 minute quadrangle map {Figure
2).
1.3 Project Description
Each of the six project components is iHustrated in Figure 3 and further described below.
Re-establishment of the maintenance access road, construction of the shoreline protection
waU and relocation of pipeline may include the foUowing equipment: cranes, excavators,
front end loaders, delivery (dump) trucks, soil compactors, pumps for dewatering,
desilting tanks and/or graders. The City of Carlsbad Department of Public Works (City)
would first remove existing vegetation along the project corridor and install appropriate
erosion control measures. The City would then grade the roadbed, instaUing additional
erosion control as necessary, compact the soils and instaU the road shoreline protection
waH. InstaUation of the shoreline protection waU would be accomplished by a technique
that involves drilHng columns that are structurally filled immediately, the "Cast-In-Drill-
Hole" method. The road would then be surfaced and the protection waH would be
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North Agua Hedionda Sewer Western Segment - Biological Assessment
Regional Map
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BASE MAP SOURCE: USGS 7.5 Minute Series, San Luis Rey Quadrangle
CORP
1" =2000'
North Agua Hedionda Sewer Western Segment • Biological Assessment
Vicinity Map
FIGURE
North Agua Hedionda Western Segment Project - Biological Assessment
Project Components
FIGURE
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
sculpted and colored. Relocation of the existing sewer line in the vicinity of the eastern
project terminus would be accompUshed via open trenching. RehabiHtation of manholes
and installation of trail infrastructure would occur after road and wall construction. All
future maintenance activities would be conducted in accordance with maintenance
operations guidelines set forth by this project.
1. Sewer Maintenance Access Road
A 12-foot wide, 3,080-foot long access road would be designated as part of the project and
would mainly be centered on the sewer line. The sewer line access road alignment is
shown in Figure 3 and a detailed description of the sewer maintenance access road is
^ provided in the attached DEIR.
The proposed access road alignment follows the centerline of the NAHI from manhole
number 8 east past manhole number 19 to new manhole number 1 (approximately 2,400
Hnear feet). This section of road would be composed of decomposed granite except for a
«i 150-foot section where paving already exists and no improvements are proposed. In
«i addition to the 2,400 feet of decomposed granite access road, a 230-foot long paved
approach road from Hoover Street is proposed. From new manhole numbers 1 to 2, the
maintenance access road diverts from the centerline of the sewer. This 450-foot portion
of the access road would be shifted approximately 70 feet south toward the lagoon and
would use the existing compacted sandy base rather than decomposed granite in order to
avoid existing residential use areas.
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The proposed access road is designed with a 2% drainage slope towards the landward side
of the alignment. The landward side of the access road would be defined by either a 2:1
slope or a crib wall. Separating the toe of slope or edge of crib wall from the road would
be a vegetated drainage swale varying from 18 inches to 36 inches wide, with gravel beds
at culvert inlets (i.e., catch basinsj. All drainage, including natural slope runoff upstream
of the project, would be collected at the culvert locations, filtered through mechanical
Best Management Practice (BMP) devices, and discharged through the seawall.
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^ 2. Shoreline Protection Wall
The proposed shoreUne protection wall would extend approximately 1,800 feet, from
* manhole numbers 10 to 19 {Figure 3). The top of the shoreline protection wall would be
approximately 0.5 to 1.0 foot above the elevation of each of the manholes. Since the
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height of the manholes varies in relation to the shoreline, the height of the wall also
would vary, with a maximum height of approximately six feet. The shoreline protection
wall would be constructed with a drilled pier foundation, consisting of 24-inch diameter,
structurally-reinforced piers spaced on six- to eight-foot centers, extending to the stable
subsurface bedrock (approximately five to 30 feet below existing grade elevation). The
area between the drilled piers is in-filled with structural concrete. A 3.5-foot high, three-
cable railing is proposed to be anchored into the shoreline protection wall where the
height of the wall exceeds 30 inches above the shoreline.
3. Sewer Pipeline Improvements
Two portions of the sewer pipeline alignment require relocation to allow permanent
access without disrupting existing land uses. Manhole number 20 and approximately 70
feet of sewer pipeline are currently located within a private volleyball court, which was
constructed on top of the existing sewer easement. Manhole number 20 is proposed to be
abandoned and a replacement manhole would be constructed.
Currently, manhole numbers 23 and 23A and approximately 240 feet of sewer run
underneath a private driveway, which was constructed over the existing sewer easement.
The City proposes to install a new stretch of sewer pipeline and two new manholes (new
manhole numbers 2 and 3) to allow continued access at the eastern edge of the alignment.
The City may abandon the two current manholes and the existing sewer segment.
Two residential lateral connections west of manhole number 19 are proposed to provide
connections to these existing lots. The lateral connections would be constructed entirely
within the existing sewer easement ROW and would tie into manhole number 19.
4. Rehabilitation of Manholes
Several manholes would be rehabilitated with lining and structural concrete patching of
*• the deteriorating concrete. These procedures would take approximately 30 days to
complete and would be conducted after the access road and shoreline protection wall have
been constructed.
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5. Future Maintenance and Operation Activities
The City would perform routine maintenance on the sewer pipeline and associated
manholes. Routine maintenance by the City requires the use of a vacuum/water jet pump
vehicle to clean accumulated debris from the sewer pipeline and manholes. Other routine
maintenance includes as often as monthly visual inspection of the access road, shoreline
protection wall, cable railing, and drainage swale.
Maintenance and operation activities includes minor grading, such as addition of
decomposed granite, inspection of manholes and manhole covers; graffiti removal,
repair/replacement of cable railing; removal of debris/trash from the swale; weed removal
along the access road; and cleaning of culverts and catch basins to remove debris and
sediment. Due to nearby sensitive biological resources, the City would maintain the
NAHI in a manner that avoids and minimizes potential impacts to sensitive wildlife as
described in detail in the attached DEIR.
Ifl 6. Development of a Portion of the Regional Trail System
The proposed maintenance access road would serve as part of the regional trail system
^ described in Carlsbad's Local Coastal Program {Figure 3). Trail amenities, including signage
describing trail rules and regulations, trash cans and waste disposal facilities for pets,
il would be located at the end of the cul-de-sac at Hoover Street and near manhole number
m 19.
^ Trail easement designations are proposed where the City is acquiring new sewer easement
as part of this project. In general, the trail easement would be coincident with the access
road where a shoreline protection wall is proposed from approximately manhole numbers
10 to 19. Future trail easements would be acquired through conditions of approval for
future development along the approximately 250-foot long section of shoreline east of the
end of the shoreline protection wall. This future trail easement would connect to the
existing trail extending west from the end of Cove Drive.
2.0 CONSULTATION REQUIRED TO SATISFY FEDERAL
ENDANGERED SPECIES
Section 7 of the Federal Endangered Species Act (FESA), as amended, stipulates that any
federal action that may affect a species listed as threatened or endangered requires a
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consultation with the United States Fish and WildUfe Service (USFWS) to ensure that the
action is not likely to jeopardize the continued existence of the listed species or result in
destruction or adverse modification of habitat of such species which is determined to be
critical (section 7[a] [2]).
To facilitate compliance with the requirements of section 7(a)(2), the federal agency shall
request a list of endangered, threatened, candidate, or proposed species in the area of the
proposed action. If these species may be present, a Biological Assessment (BA) is needed
to identify any endangered or threatened species that are likely to be affected by the
action (section 7[c]) and whether a formal consultation with the USFWS is required. If a
formal consultation is required, the USFWS reviews the Biological Assessment and
determines through a Biological Opinion (BO) whether the action is likely to jeopardize
the continued existence of any endangered or threatened species or result in the
destruction or adverse modification of habitat of such species which is determined to be
critical. The BO also may recommend reasonable and prudent alternatives that are
consistent with the intended purpose of the action (project) and would allow the action
to proceed without violation of section 7(a)(2).
This document constitutes the BA for a federally-Usted threatened species, the California
gnatcatcher. This species may potentially be directly and indirectly affected by the
proposed project and were the subject of site surveys described below. For the purpose of
establishing mitigation for other impacts to sensitive biological resources resulting from
the project, in accordance with National Environmental Policy Act (NEPA) requirements,
this document also describes other species which may be present and describes avoidance,
minimization and mitigation measures.
3.0 SPECIES OF CONCERN
m 3.1 Federally Proposed and Listed Species Potenfially Occurring in
m the Project Area
Coastal sage scrub is the dominant upland vegetation community within the project
corridor. The coastal California gnatcatcher was considered to have a high likelihood of
occurring onsite.
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Habitat within the project corridor was searched for indications that "narrow endemic"
plant species could be present, and it was determined that there is no suitable habitat for
any such potentially-occurring species including the following federally-listed species: San
Diego thornmint {Acanthomintha ilicifoli), Del Mar manzanita (Arctostaphylos glandulosa
ssp. Crassifolia), coastal dunes milk-vetch (Astragalus tener var. titi) thread-leaved brodiaea,
(Brodiaea filifolia), Orcutt's spineflower {Chorizanthe orcuttiana), and salt marsh bird's-beak
(Cordylanthus maritimus ssp. maritimus). Dudek biologist Phil Behrends, Ph.D. conducted a
habitat survey for the federally-listed endangered Pacific pocket mouse {Perognathus
longimemhris pacificus) and determined that potential habitat supporting this species is not
present. Several sensitive bird species are associated with southern coastal salt marsh,
beach/mudflat and other habitats commonly found in lagoon environments like Agua
Hedionda. Dudek biologists Anita Hayworth and Harold A. Wier surveyed the entire
project area and assessed the availability of both foraging and nesting habitat for these
birds. The following federally-listed bird species were determined to have a low potential
to occur based on lack of suitable habitat: western snowy plover (Charadrius alexandrinus
nivosus), Belding's savannah sparrow (Passerculus sandwichensis heldingi), California brown
pt\icd.n (Pelecanus occidentalis californicus), light-footed clapper rail (Rallus longirostris
levifes), and California least tern (Sterna antillarum brownii).
3.2 Literature Review
Sensitive biological resources present or potentially present onsite were identified through
a literature search using the following sources: U.S. Fish and WildUfe Service (2004),
California Department of Fish and Game (CDFG 20024 a,b,c), the CaHfornia Native Plant
Society (CNPS) Inventory of Rare and Endangered Vascular Plants (CNPS 2001), and the
vegetation and sensitive species mapping performed for the Multiple Habitat
Conservation Program (SANDAG 2001). General information regarding wildlife species
present in the region was obtained from Unitt (1984), Ehrlich (1988), and Garrett and
Dunn (1981) for birds; Bond (1977) for mammals; Stebbins (2003) for reptiles and
amphibians; and Emmel and Emmel (1973) for butterflies. Numerous other literature
sources were consulted during the studies, as referenced in Section 4-2.
3.3 Informal Consultation With Public Agency Personnel
John Martin from the USFWS Carlsbad field office was consulted by Dudek in 1999.
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4.0 METHODS
Biological studies for the 23.2-acre project study area were conducted by Dudek biologists
in 1999, 2001 and 2003 and were reported in a Biological Resources Technical Report
submitted by Dudek in December 2003. The wildlife Hst for the proposed project site was
updated by Dr. Hayworth in April 2003.
Vegetation mapping, rare plant surveys and a jurisdictional wetlands delineation were
conducted in December 1998 and January 1999 by Dudek biologists Howie Wier, Sherri
Miller and Vipul Joshi. The survey area covered the entire 23.2 acre site.
Updates to vegetation mapping, rare plant surveys and jurisdictional wetlands were
conducted in August 2001 by Dudek biologists Vipul Joshi and Michelle Balk. All plant
species encountered during the field survey were identified and recorded. Any species
identified as sensitive by the CDFG or the USFWS were mapped onsite.
WildUfe species observed or detected during field surveys by binocular-aided sight, calls,
tracks, scat, or other sign were recorded. In addition to species actually observed, this
report discusses expected sensitive wildlife use of the area based previous biological
surveys {e.g., Surveys conducted by Dudek 1998, 1999, 2001 and 2003) and on knowledge
of habitat preferences and species distributions in the area.
4.1 Botanical Resources
The project corridor is located along the north shore of Agua Hedionda Lagoon
immediately east of 1-5. Plant communities and wetland delineation were mapped
directly onto a 240-scale (1"=240') aerial photograph (Photo Geodetic Corporation, flown
17 June 1998) of the site. The boundaries were transferred to a digital topographic base by
Dudek GIS technician Lesley Terry using ArcCAD. In addition to data gathered from field
surveys, limits of the original access road and riprap were transferred from the original
mapping of the project corridor (Associated Engineers 1965).
Plant community classifications used in this report foUow HoUand (1986), with
modifications to accommodate the lack of conformity of the observed communities to
those of HoUand. Locations of rare or sensitive plant and wUdlife species also were
mapped.
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4.2 Zoological Resources
WUdlife species were detected and recorded during general and focused surveys conducted
m at the NAHI West site between March 1999 and August 2003. WUdlife species were
m identified by direct observation or by sign such as songs, calls, nests, scat, tracks or
skeletal remains.
4.3 Sensitive and/or Regulated Resources
• A rare plant assessment of the entire project site was conducted in December 1998 by
^ Dudek biologists Howie Wier, Sherri MiUer and Vipul Joshi. The site was surveyed again
^ for rare plants in August 2001 by Dudek biologists Vipul Joshi and MicheUe Balk. AU
plant species encountered during the field survey were identified and recorded. Any
• species identified as sensitive by the CNPS, CDFG or the USFWS were mapped onsite.
^ Focused surveys for the coastal California gnatcatcher were conducted by Dudek
^ biologists Julie Vanderwier and Dr. Anita M. Hayworth in March and AprU 1999, and
September and October 2001 for the coastal California gnatcatcher. All surveys for the
• California gnatcatcher were conducted in accordance with the USFWS protocol: three
surveys of each 100-acre potential habitat area, each survey separated by one week.
^ Focused surveys for the salt marsh skipper {Panoquina errans) were conducted by Dudek
biologist Dr. Anita M. Hayworth in August 2003. This species is not Usted as sensitive,
• threatened, or endangered by CDFG or USFWS, but is considered locally sensitive as
• demonstrated by its inclusion on the covered species list for Multiple Habitat
^ conservation Plan (MHCP) and the Carlsbad Habitat Management Plan (HMP).
^ Although no survey protocol is established for this species, surveys were conducting using
a method that maximizes detection of the species. The survey methods included three
•i visits surveying suitable habitat within the project corridor during the documented peak
iH of the flight season and during the warmest period of the day.
^ Observations of other sensitive species were recorded during reconnaissance and focused
surveys. In general, species lists gathered during field visits were compared with listings
• of sensitive species (USFWS 2004; CDFG 2004 a,b,c,; CNPS 2002).
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4.4 Assessment of Direct, Indirect, and Cumulative Impacts
Direct impacts would result from: (1) re-establishment of the sewer maintenance access
road, (2) construction of a shoreline protection wall, and (3) relocation of 300 feet of the
sewer pipeline. Direct permanent impacts include the footprint of the proposed road,
seawaU, cribwalls, and areas between the road and waUs. Direct permanent impacts to
jurisdictional waters include 0.04 acre of intertidal mudflat, <0.01 acre of intertidal rocky
beach, 0.10 acre of southern coastal salt marsh, and <0.01 acre of unvegetated ephemeral
stream channel. In addition, 0.30 acre of coastal sage scrub would be directly impacted.
All other direct permanent impacts to vegetation communities and land cover types are
not considered significant.
Indirect Impacts are very difficult to identify and quantify but are presumed to occur.
They primarily result from adverse "edge effects": either short-term indirect impacts
related to construction or long-term, chronic indirect impacts associated with the location
of urban development in proximity to biological resources within natural open space. In
particular, long-term indirect impacts associated with this project include the last three
project components: (1) rehabUitation of manholes, (2) future maintenance and
H operation activities, and (3) development of a portion of the regional traU system.
•f
During construction of the project, short-term indirect impacts may include dust and
noise that could disrupt habitat and species vitality temporarily and construction related
** soU erosion and runoff. Long-term indirect impacts may include intrusions by humans
m and domestic pets, noise, lighting, invasion by exotic plant and wUdUfe species, effects of
li toxic chemicals {e.g., fertUizers, pesticides, herbicides, and other hazardous materials),
urban runoff from developed areas, soU erosion, litter, fire, and hydrological changes {e.g.,
groundwater level and quality).
Cumulative Impacts refer to incremental individual environmental effects of two or
more projects when considered together. These impacts taken individually may be minor,
but coUectively significant as they occur over a period of time. The analysis of cumulative
impacts is based on the project's consistency with existing regional resource planning
documents including the HMP, Open Space and Conservation Resource Management
Plan, and the Agua Hedionda Land Use Plan and Local Coastal Program.
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5.0 ENVIRONMENTAL SETTING
The proposed project study area is situated along the northern shore of Agua Hedionda
Lagoon in the City of Carlsbad, CaUfornia {Figure 1). The project area extends along the
sewer alignment from immediately east of Interstate 5 (1-5), foUows the shoreline east
then south and east to the southern terminus of Cove Drive {Figure 2). The upland areas
in the northwestern portion of the project corridor consist primarily of undeveloped lands,
disturbed to varying degrees. Upland land use is simUar in the southeastern portion of the
project. However, this area also includes several developments including private
residences and a commercial boat launch/restaurant.
According to Bowman (1973) there are two soU types found onsite: Carlsbad gravelly
sandy loam and Marina loamy coarse sand. Elevations along the project corridor vary
from approximately three feet below mean sea level (msl) to 30 feet above msl. The
project area consists mostly of vacant land supporting an intertidal zone and
hiUsides/bluffs with native scrub habitat. Several homes and a few businesses also occupy
•1 portions of the study area.
^ 5.1 General Biota
1^
The general biota of the NAHI West project site is described in detaU in the Biological
• Resources Technical Report (Dudek 2003). A brief overview of the biota of the project
* site is provided below.
ii 5.1.1 Botany
^ Nomenclature for plant communities follows HoUand (1986), with modifications to
accommodate the lack of conformity of the observed community to those of HoUand.
Based on species composition and general physiognomy, eight native plant communities
or habitat types were identified onsite: open water, intertidal mudflat, intertidal rocky
shore, southern coastal salt marsh, disturbed southern coastal salt marsh, disturbed
southern wiUow scrub, coastal sage scrub, and disturbed coastal sage scrub (Figures 4A-E).
m In addition, five altered or non-native habitat types are present: annual (non-native)
il grassland, eucalyptus woodland, ruderal habitat, ornamental plantings, and disturbed
_ habitat. Finally, a category for developed land is included.
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ti fti m^M mm m-m K.I • a •! fti ft a fti 11 fti It t I 11
I /
4C
4E
SEE FIGURE 4B FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delination Index Map
FIGURE
4A
• 1 ft ft M mM M m.M fti ft! m.M mm mm ft ft J ft I fti fti II f I I i
VEGETATION TYPES/LANDCOVERS:
Annual Grassland AGL DH
CSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
EUC
IM
IRB
Disturbed Habitat
Eucalyptus Woodland
Intertidal Mudflat
Intertidal Rocky Beach
NOTE:
A lower case'd' in front of a vegetation type designator indicates that it is disturbed.
An upper case 'J' following a vegetation type designator indicates that it is Jurisdictional.
^
Waters of the U. S.
(Number indicates width of unvegetated
channel.)
O Data station
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher (Dudek, 2001)
SMS Salt marsh skipper (Dudek, 2003)
BASE PHOTO SOURCE: CITY OF CARLSBAD
SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. (ADJUSTED TO TOPOGRAPHIC FEATURES)
ORN
OW
RUD
SWS
Ornamental
Open Water
Ruderal
Southern Willow Scrub
\
\ / Study Area
Impact Area
Sewer System
CAGN General Area of
Calling/Movement
SENSITIVE PLANT SPECIES:
Ac Adolphia californica
Ja Juncus acutus ssp. leopoldii
NOTE: Number indicates individual plant
counts at that location.
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delineation Map
FIGURE
4B
fti lift ft ft ft::! ft ft ft; ft mm Sft K:! ft ft fti ft ft fti fti fti i II f I i 1
Si
CO
u
I
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delineation Map
FIGURE
4C
k s ft. J ft « ft J ft J ^ J ft. J II J ft. J ft J J h J ft J I. J n J 1^ J I J II
.1
CO
I
SEE FIGURE 4B FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Project • Biological Assessment
Biological Resources & Jurisdictional Delineation Map
FIGURE
4D
i i ^ M i i fk M Ik M g Ik i H J & i li J i i a J i i i j i j i j i i | | | |
SEE FIGURE 48 FOR BIOLOGICAL
RESOURCES LEGEND SCALE IN FEET
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delineation Map
FIGURE
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
^ Opfen Water
^ This habitat type refers to the lagoon area beyond the shore, which permanently contains
water and does not contain emergent vegetation. This land cover type onsite is present
wk along the southwestern and southern borders of the project site. This habitat is regulated
^ under Sections 401 and 404 of the Clean Water Act as a wetland, is of limited occurrence
in southern California, and therefore is considered sensitive.
m
^ Intertidal Mudflat
m
^ Intertidal mudflat areas include all of the sandy shore located within the normal tide flow
between highest tide (+4.91 ft msl) and mean lower low tide (-2.88 ft msl) (Holland
1986). This area contains little vegetation aside from algae, but it is used for foraging by
some shorebirds. This habitat occupies the majority of the intertidal zone within the
project corridor. Although this area contains mostly sand, it is not considered a sandy
beach because it is regularly inundated and does not have the loose soil composition
typical of a sandy beach community. This habitat is regulated under Sections 401 and 404
of the Clean Water as a wetland, is of limited occurrence in southern California, and
therefore is considered sensitive.
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Intertidal Rocky Beach
The rocky intertidal areas in the project area consist of exposed bedrock and rip-rap
probably remnant from the shoreline protection associated with construction of the sewer
line and access road in 1965. All rocky intertidal habitat within the project corridor is
unvegetated. Two rocky intertidal areas were identified; one is located near the middle of
the project (approximately 200 ft in length) and another smaller area (approximately 50 ft
in length) is located near the eastern terminus of the project. This habitat is regulated
under Sections 401 and 404 of the Clean Water as a wetland, is of limited occurrence in
m. southern California, and therefore is considered sensitive.
Southern Coastal Salt Marsh
Southern coastal salt marsh occurs in bays, lagoons and estuaries receiving marine tidal
influence (Holland 1986). Vegetation, containing salt-tolerant hydrophytes, is typically
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highly productive, forming moderate to dense cover up to one meter (m) tall. Most
species are active in the summer and dormant in the winter. Vegetative composition
varies with tidal influence and period of inundation with the greatest diversity of species
occurring with least tidal influence. Typical species include alkali weed {Cressa
truxillensis), salt grass, salty Susan (Jaumea carnosa), salt-cedar {Monanthochloe littoralis),
pickleweed {Salicornia spp.), California cordgrass {Spartina foliosa) and California sea-blite
{Suaeda californica).
Onsite, southern coastal salt marsh occurs below ten feet in elevation, adjacent to the
sandy or rocky shoreline. Typical species found were salt grass, common pickleweed,
salty Susan, spiny rush and saltbush {Atriplex spp.). Coastal salt marsh patches are
present in a variety of sizes and are concentrated in the western region of the project site.
Four large patches of salt marsh are located along the shoreline near Hoover Street and
near the middle of the project adjacent to the rocky shore. For the remainder of the
project site southern coastal salt marsh is interspersed with ruderal and coastal sage scrub
habitats.
Coastal salt marsh habitat in California has been greatly. This incremental loss of
* wetland habitat has placed coastal salt marsh and other wetland habitat under sensitive
status. Furthermore coastal salt marsh is a regulated habitat under Sections 401 and 404
of the Clean Water Act as wetland habitat.
Disturbed Southern Coastal Salt Marsh
Three areas of disturbed southern coastal salt marsh are mapped in the eastern portion of
the project corridor. These patches support salt grass and other indicator species but also
several non-native species including Bermuda grass {Cynodon dactylon) and several escaped
exotics from adjacent landscaping.
Although disturbed, this community provides similar function as a non-disturbed salt
marsh and is regulated under the Clean Water Act as wetland habitat. Therefore, this
community is considered sensitive.
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Disturbed Southern Willow Scrub
Holland (1986) describes southern willow scrub as a dense, broad-leafed, winter-deciduous
riparian thicket dominated by several species of willow {Salix spp.), with scattered
emergent Fremont's cottonwood {Populus fremontii) and western sycamore (Platanus
racemosa). The closed canopy of this riparian community typically inhibits the
development of a diverse understory.
Onsite, disturbed southern willow scrub occurs between Foxes Lift Station and the
manufactured slope of Interstate 5 within a drainage ditch . The area supports a canopy
of mature arroyo willow (Salix lasiolep>is) with an understory dominated by exotic
invasive species such as castor-bean (Ricinis communis), black-eyed susan (Thunhergia
alata), and fan palm (Washingtonia rohusta). Despite the disturbance of invasive species,
this community onsite retains wetlands functions and values and is regulated during the
Clean Water Act and Fish and Game Code as wetlands habitat. Therefore, this
community is considered sensitive.
Coastal Sage Scrub
Coastal sage scrub is a native plant community composed of a variety of soft, low,
aromatic shrubs, characteristically dominated by drought-deciduous species such as
California sagebrush {Artemisia californica), flat-top buckwheat {Friogonum fasciculatum),
and sages {Salvia spp.), with scattered evergreen shrubs, including lemonadeberry {Rhus
integrifolia), laurel sumac {Malosma laurina) and toyon {Heteromeles arbutifolia). It typically
develops on south-facing slopes and other xeric situations (Holland 1986).
Coastal sage scrub is the most common upland habitat along the project corridor. Coastal
sage scrub habitat extends landward from the southern coastal salt marsh and ruderal
habitat. This habitat type is dominated by California sagebrush, black sage, California
encelia {Fncelia californica), flat-top buckwheat, coyote brush {Baccharis pilularis),
lemonadeberry and laurel sumac, but also includes pampas grass {Cortaderia selloana) and
prickly-pear {Opuntia littoralis).
Coastal sage scrub is recognized as a sensitive plant community by local, state, and federal
resource agencies. It supports a rich diversity of sensitive plants and animals, and it is
estimated that it has been reduced by 75-80% of its historical coverage throughout
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southern California. It is the focus of the current State of California Natural
Communities Conservation Program (NCCP).
Disturbed Coastal Sage Scrub
Five areas of disturbed coastal sage scrub were mapped in the project corridor. These
patches contained lemonadeberry, laurel sumac, black sage {Salvia mellifera), and other
indicator species, but they also contained several non-native species including pampas,
hottentot-fig {Carpobrotus edulis), curly dock {Rumex crispus), horehound {Marrubium
vulgare), and slender wild oat {Avena barbata). Disturbed coastal sage scrub onsite
supports 20 to 50% cover by coastal sage scrub indicator species.
Although disturbed, this habitat type provides similar function as the non-disturbed
variety and therefore is considered sensitive.
Annual (non-native) Grassland
Where native plant communities have been subject to repeated or severe disturbance, the
habitat frequently reverts to annual or non-native grassland. These areas usually are
dominated by annual grasses, such as bromes {Bromus spp.) and wild oats {Avena spp.),
and other disturbance-tolerant species such as filarees {Frodium spp.), telegraph weed
{Heterotheca grandiflora), and doveweed {Fremocaryus setigerus).
Onsite, annual (non-native) grassland is present in one patch in approximately the middle
of the project site, adjacent to a developed area. This area is dominated by ripgut grass
{Bromus diandrus), slender oat {Avena barbata), and Bermuda grass. Other introduced,
weedy species such as black mustard {Brassica nigra), sweet fennel {Foeniculum vulgare),
and bristly ox-tongue {Picris echioides) are also present in this habitat type onsite. Annual
grassland is typically only considered sensitive when it occurs in large blocks of open
habitat where it may provide significant function for raptor foraging and rodent habitat.
The occurrence of annual grassland within the project corridor is not considered sensitive.
Eucalyprtus Woodland
Although not recognized as a native plant community by Holland (1986), eucalyptus
woodland is a distinct vegetation type that is fairly widespread in southern California. It
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typically consists of monotypic stands of introduced, Australian eucalyptus trees
{Fucalyptus spp.). The understory is either depauperate or lacking owing to shade and the
possible allelopathic (toxic) properties of the eucalyptus leaf litter. Although eucalyptus
woodlands are of limited value to most native plants and animals, they frequently provide
nesting and perching sites for some local raptors.
Two stands of eucalyptus are present in the eastern section of the study area. Eucalyptus
woodland is not considered a sensitive habitat although some raptor species may use it for
nesting.
Ruderal
Ruderal habitats are dominated by non-native forb species but may also contain some
non-native grasses.
Ruderal habitat onsite is dominated by Hottentot-fig {Carpobrotus edulis), but also
includes cockle-bur {Xanthium strumarium), Bermuda grass, telegraph weed and castor-
bean. The largest extent of ruderal habitat was mapped in the area extending from
Hoover Street to the shore. The remainder of the ruderal habitat occurs in two smaller
patches in the western region of the project site and in one small patch along Cove Street
in the eastern region. Ruderal habitat is not considered sensitive.
Ornamental/Develof^ed Land
Ornamental land cover consists of landscaped areas associated with private development.
^ The ornamental vegetation includes Bermuda grass and a variety of woody and
«• herbaceous landscape plants. Developed land cover refers to areas that currently support
structures. Developed areas include: the boat launch/restaurant, several pilings, a
volleyball court on a private residence and parking garage and sidewalk adjacent to an
apartment complex. Ornamental/developed land is not considered sensitive; however, in
« four areas in the eastern portion of the study corridor, these land use types occur below
m five feet above msl and are regulated habitat under Sections 401 and 404 of the Clean
Water Act; these areas are therefore considered sensitive.
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Disturbed Habitat
m
These areas generally are the result of severe or repeated mechanical perturbation but
m appear to be capable of recovering to a native vegetation community. Within the project
ii corridor, this vegetation type includes areas that appear to experience a high level of
_ vehicular and pedestrian traffic. This habitat type is only sparsely vegetated by a mixture
of coastal sage scrub species (less than 20%), non-native grass and forbs. Disturbed
habitat was found mainly in the eastern region of the project and surrounding the boat
launch, with a small patch mapped near the center of the project. Disturbed habitat is
not considered sensitive.
Floral Diversity
m
ii
A total of 130 species of vascular plants: 76 native (58 percent) and 54 non-native (42
percent), was recorded from the site {Appendix A). The recorded flora of the site is limited
as a consequence of the limited number and extent of native plant communities, and the
fact that surveys were conducted in winter and fall.
5.1.2 Zoology
The wildlife list of the project study area represents cumulative data most recently
updated by Dudek biologist Dr. Anita M. Hayworth during general and focused wildlife
surveys in April and August 2003. The cumulative list of species observed during Dudek's
surveys is included as Appendix B.
5.7.2.7 Birds
Thirty-seven bird species were observed during the cumulative survey visits {Appendix B).
The diversity of birds is limited due to the small amount of habitat and relatively low
habitat quality. The coastal sage scrub and ornamental plantings onsite provide habitat
for a variety of birds, including house finch {Carpodacus mexicanus), Anna's hummingbird
{Calypte anna), California towhee {Pipilo crissalis), bushtit {Psaltriparus minimus), American
crow {Corvus brachyrhynchos) and the federally-listed threatened coastal California
gnatcatcher. The coastal salt marsh and intertidal areas provide habitat for a number of
birds, including great blue heron {Ardea herodias), killdeer {Charadrius vociferus), willet
{Catoptrophorus semipalmatus) and American coot {Fulica americana). All species were
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observed within the project corridor with the exception of a brown pelican {Pelecanus
occidentalis californicus), state- and federally-listed as endangered, and Caspian and Forster's
terns (Sterna caspia and S. foresti) which were observed south of the project corridor on
open water.
5.7.2.2 Reptiles and Amphibians
One reptile species was observed onsite: side-blotched lizard {Uta stansburiana).
However, reptiles common in the area and likely to occur onsite include western fence
lizard {Sceloporus occidentalis), gopher snake {Pituophis melanoleucus), red-diamond
rattlesnake {Crotalus ruber), coachwhip {Masticophis flagellum) and common kingsnake
{Lampropeltis getulus).
No amphibian species were observed during the survey; however, one or more of the
following species may occur onsite: garden slender salamander {Batrachoseps attenuatus),
western toad {Bufo boreas) and Pacific treefrog {Hyla regilla).
Habitat quality for reptiles and amphibians is low and the diversity of these species is
expected to be low because of the small amount of habitat available and the likely
negative effects of the adjacent urban development.
5.7.2.3 Mammals
Mammal species, or their sign, observed onsite during the survey include brush rabbit
{Sylvilagus bachmani), Botta's pocket gopher {Thomomys bottae), California pocket mouse
{Chaetodipus californicus), striped skunk {Mephitis mephitis) and domestic dog {Canis
familiaris). Mammals not observed onsite but likely to be present include California
ground squirrel {Spermophilus beecheyi), California mouse {Peromyscus californicus), deer
mouse {Peromyscus maniculatus), Dulzura California pocket mouse {Chaetodipus californicus
femoralis), cactus mouse {Peromyscus eremicus), woodrat {Neotoma sp.), Virginia opossum
{Didelphis virginiana) and coyote {Canis latrans).
5.7.2.4 /nvertebrotes
A number of intertidal species were observed during the survey visit which was scheduled
during a springtime low tide in order to maximize detection of invertebrates. The species
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observed include those that occur within mudflat habitats and those that occur within
the rocky intertidal zone. The mudflat species included the mud-flat crab {Hemigrapsus
oregonensis), and scattered dead individuals of clams and scallops that had washed onto the
mudflat areas. Burrows of clams were visible but individuals were not dug up in order to
identify them. It is likely there are many other mudflat dwelling organisms including a
variety of worms and other soft bodied invertebrates. Within the limited areas of rocky
intertidal habitat, clusters of blue mussels {Mytilus edulis) and barnacles {Balanus glandula)
were observed with scattered individuals of various limpet and snail species. A complete
list of the invertebrates observed during the visits is included m Appendix B.
Eight species of butterfly were recorded during surveys including cabbage butterfly {Pieris
rapae), west coast lady {Vanessa annabella), pygmy blue (Brephidium exile), fiery skipper
(Hylephila phyteus), salt marsh skipper, and buckeye Qunonia coenia). The moderate plant
species richness onsite is undoubtedly accompanied by a fairly diverse number of
phytophagous (plant-feeding) insect species. In particular, a variety of species of
Lepidoptera (butterflies and moths) and a comparable number of Coleoptera (beetles),
Hymenoptera (bees, ants and wasps), and Diptera (flies) are expected to be present within
the local area.
5.2 Sensitive Resources
The following resources are discussed in this section: (1) plant and animal species present
in the project vicinity that are given special recognition by federal, state, or local
conservation agencies and organizations owing to declining, limited, or threatened
populations, that are the results, in most cases, of habitat reduction; and (2) habitat areas
that are unique, are of relatively limited distribution, or are of particular value to wildlife.
Sources used for determination of sensitive biological resources are as follows: wildlife ~
USFWS (2004), CDFG (2004 a,b,c), Remsen (1978), Everett (1979), McGurty (1980), and
Murphy (1990); plants ~ USFWS (2004), CDFG (2004), and California Native Plant
« Society (2001); and habitats - Holland (1986),
5.2.1 Sensitive Plant Species
No state- or federally-listed threatened or endangered plant species were observed within
the NAHI West project site. One species, southwestern spiny rush (Juncus acutus ssp.
leopoldii), recognized as locally sensitive by the CNPS, was detected and recorded onsite
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ii
during rare plant surveys conducted by Dudek in 1998 and 2001 (Figure 4D).
* No other sensitive plant species were detected or determined to potential occur within the
il project study area.
ii
^ Implementation of the proposed project would result in direct impacts to approximately
^ 35 individual spiny rush plants within the project corridor.
^ 5.2.2 Sensitive Animal Species
Ml
Implementation of the proposed project would result in the permanent and temporary
ii loss of habitat that is occupied by two pair of coastal California gnatcatcher (Figure 4D).
A detailed description of the California gnatcatcher is provided below. The listing
authorities and an explanation of listing categories are presented in Appendix C.
ii
Polioptila californica californica - coastal California gnatcatcher
•i USFWS: Threatened
^ CDFG: Species of Special Concern
The California gnatcatcher is a small gray non-migratory bird with black tail markings.
During the breeding season the male has a distinct black cap. Gnatcatchers eat insects
•* and build a small, cup-shaped nest of plant material, animal hair, and spider webs. A pair
of gnatcatchers typically forages over 5 to 20 acres during the breeding season and more
widely at the end of spring. The present known range of the California gnatcatcher
extends from the Ventura County south through Orange, western Riverside, western San
*• Bernardino and San Diego counties, into northern Baja California, Mexico. The
gnatcatcher is a near obligate resident of sage scrub plant communities. Individuals of
this species generally are found at elevations below 900 feet in San Diego, Orange,
Ventura and Los Angeles counties, and below 1600 feet in San Bernardino and Riverside
Counties (Atwood 1990). Based on recent resource mapping for subregional management
m plans e.g. Multiple Species Conservation Plan (MSCP), Multiple Habitat Conservation
il Plan (MHCP), and Orange County Natural Communities Conservation Plan (NCCP), it is
estimated that there are 3,000 to 3,500 pairs in CaHfornia.
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Focused surveys indicate that habitat occupied by two pairs of coastal California
gnatcatcher occur onsite.
Non-listed Sensitive Animal Species
Sixteen individuals of saltmarsh skipper within the project were observed in seven
locations within the 0.36 acre of southern coastal salt marsh within the project corridor,
generally nectaring on wild heliotrope (Hetiotropium currassavicum) (Figures 4Q A E).
The saltmarsh skipper is listed as a Special Animal by CDFG (2002c) and is a covered
species under the City of Carlsbad's Habitat Management Plan (HMP), but is neither a
California Species of Concern or considered sensitive by the USFWS.
Sensitive species not detected but with a high potential to occur within the project
alignment include San Diego horned lizard {Phrynosoma coronatum blainvillei), western
whiptail {Cnemidophorus tigris multiscutatus), orange-throated whiptail (C hyperythrus
beldingi), southern California rufous-crowned sparrow {Aimophila ruficeps canescens),
California horned lark {Fremophila alpestris actia), San Diego desert woodrat {Neotoma
lepida intermedia), and Dulzura California pocket mouse {Chaetodipus californicus femoralis).
These species would also be affected by the permanent and temporary loss of native
habitat.
5.3 Regional Resource Planning Context
Cr/f/ca; Hob/tat
The proposed project is located outside of designated critical habitat for the California
gnatcatcher. Proposed mitigation is location within designated critical habitat (Figure 5).
Relationship to Carlsbad HMP
In terms of compliance with regional resource planning documents, the Carlsbad HMP is
the most recently approved document and supercedes previous plans in terms of
permitted biological impacts (Carlsbad 1999). The City's HMP guides biological resource
planning, protection, and development within the City in conformance with California's
Natural Communities Conservation Planning Act (NCCP). The HMP has been approved
by the City and the California Coastal Commission (CCC), but to date the USFWS and
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Vegetation / Landcover:
Agriculture
Chaparral
I Sage Scrub
Developed
I Disturbed Habitat
Grassland
I Open Water
Riparian Scrub / Woodland
^ Wetland
MHCP FPA
OQ] Hard Line
Soft Line
• Sensitive Species
Project Alignment Area
e
l^^l Critical Habitat for Coastal California Gnatcatcher
(J) Proposed Habitat Creation Site
750 1.500 3,000
SOURCE: City of Carlsbad, SANDAG & USFWS .
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Regional Vegetation & Species, Proposed FPA Hard/Soft Lines and Critical Habitat Map
FIGURE
5
m
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
CDFG have not issued Take Authorization for any covered species and an Implementing
Agreement has not been finalized.
The HMP identifies core and linkage areas throughout the City and focused preserve
assembly on these areas. The Agua Hedionda Lagoon lies within Core 4 and has
associated linkages east of the lagoon. These core and linkage areas contain important
vegetation communities including saltmarsh, freshwater marsh, coastal sage scrub,
southern maritime chaparral, and riparian scrub. Important populations of saltmarsh
skipper, light-footed clapper rail (Rallus longirostris levipes), western snowy plover
(Charadrius alexandrinus nivosus), California least tern (Sterna antillarum brovc^ni),
andBelding's Savannah sparrow (Passerculus sandwichensis beldingi) occur in the estuarine
habitats associated with Agua Hedionda Lagoon. This lagoon is also important for the
California brown pelican and American peregrine falcon (Falco peregrinus anatum). Upland
species identified as having important occurrences within this area include wart-stemmed
ceanothus (Ceanothus verrucosus). Based on proposed development and biological
resources, hard and soft line Focus Planning Areas (FPA) are designated in the HMP. Hard
line areas generally require 100% conservation and soft line areas generally require specific
conservation standards to be implemented during development review.
The proposed project lies mostly within the hardline FPA (Figure 5). The project study
corridor contains several habitat types considered sensitive by the Draft HMP: intertidal
mudflats, intertidal rocky beach, open water, disturbed southern willow scrub, southern
coastal salt marsh and coastal sage scrub. Sensitive species found within the study area
which are covered under the HMP include California gnatcatcher and saltmarsh skipper.
Regional Wildlife Corridors
Agua Hedionda Lagoon is part of Core Area 4 of the Carlsbad HMP (Carlsbad 1999). It is
linked to other preserve core areas to the north, northeast, southeast, and south via
Linkage Areas B and F. Linkage B extends north to link to Core 2 (352 acres north of
Carlsbad Village Drive) and northeast to Core 3 (1,164 acres around Lake Calavera).
Linkage F extends southeast to Core 6 (1,134 acres south of Palomar Airport Road) and
south to Core Area 8 (1,129 acres around Batiquitos Lagoon). The linkage to Core 3 is
considered a moderately effective linkage for bird and mammal movement. The other
linkages are crossed by roads that reduce their value as a movement corridor for mammal
species and reptiles, but still serve as stepping-stone linkages for bird dispersal (Carlsbad
1999).
& ASSOCIATES, INC.
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
The project is located in the northwestern part of Agua Hedionda Lagoon, outside of these
regional linkages and is surrounded by residential development. Several small patches of
coastal sage scrub occur north of the site but are separated by residential development.
The intertidal and adjacent native upland area is not likely to function as a mammalian
movement corridor as it is bounded on both the east and west ends by marinas, but may
provide a wetlands buffer for bird species which utilize this portion of the lagoon. Long-
term project impacts to bird use in the area are not significant due to the low acreage of
permanent impacts and restoration of temporary impacts. Therefore, the proposed
project would not directly impact functioning linkages or corridors.
ConnectiVi'fy to Open Space
Agua Hedionda Lagoon is part of Core Area 4, a 1,063-acre area includes upland areas or
primarily grassland and coastal sage scrub east and south of the lagoon. Major areas of
coastal sage scrub and small patches of grassland, southern maritime chaparral, and
coastal sage scrub/chaparral are present in this regionally important open space area.
Because the project is on the northern side of Agua Hedionda Lagoon and the open space
extends to the south and east, connectivity to open space would not be impacted by the
project. These coastal sage scrub patches north of the project area are likely to continue
to function as a buffer for water birds using the lagoon or intertidal area, as described
above.
* 6.0 RESULTS
This section addresses potential impacts to the California gnatcatcher that would result
from implementation of the proposed NAHI West project. A plan view of the permanent
and temporary impact footprints is shown on Figures 6A-6F. Cross sections of the road are
depicted in Figures 7A 62 7B.
6.1 California Gnatcatcher
Focused surveys for the California gnatcatcher conducted at the NAHI West site by
Dudek biologists in March and April 1999, and in September and October 2001 detected
two pair of California gnatcatchers occupying coastal sage scrub on the NAHI West
project site.
2798-03
May 2004
Professumal Teams for Complex Projerti
II f i 1 i m M Ik M m M i. J i. J a J i J ik j ik i n i i i i j i j i i i i i §
^^liiL^s ^^"^
BEST ORIGINAL
SEE FIGURE 6B FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delination Map
with Limits of Permanent &Temporary Impacts
FIGURE
6A
VEGETATION TYPES/LANDCOVERS:
Annual Grassland AGL DH
CSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
EUC
IM
IRB
Disturbed Habitat
Eucalyptus Woodland
Intertidal Mudflat
Intertidal Rocky Beach
NOTE:
A lower case'd' in front of a vegetation type designator indicates that it is disturbed.
An upper case 'J' following a vegetation type designator indicates that it is Jurisdictional.
/ \r/ Waters of the a S.
(number indicates width of unvegetated
channel.)
O Data Station
Limits of Permanent Impact
Limits of Temporaiy Impact
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher (Dudek, 2001)
BIAS Salt marsh skipper (Dudek, 2003)
BASE PHOTO SOURCE: CITY OF CARLSBAO
SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. (ADJUSTED TO TOPOGRAPHIC FEATURES)
ORN
OW
RUD
SWS
Ornamental
Open Water
Ruderal
Southern Willow Scrub
Study Area
Impact Area
Sewer System
CAGN General Area of
Calling/Movement
SENSITIVE PLANT SPECIES:
Ac Adolphia californica
Ja Juncus acutus ssp. leopoldii
liOTE: Number indicates individual plant
counts at that location.
North Agua Hedionda Sewer Western Segment Project • Biological Assessment
Biological Resources & Jurisdictional Delination Map
with Limits of Permanent &Temporary Impacts
FIGURE
6B
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delination Map
with Limits of Permanent &Temporary impacts
FIGURE
6C
Figure 6C -Tl 10A -A /
V • •' See <U 1
^ •
CSM-/ ^ • il
SEE FIGURE 68 FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delination Map
with Limits of Permanent &Temporary impacts
FIGURE
6D
SEE FIGURE 6B FOR BIOLOGICAL
RESOURCES LEGEND
SCALE IN FEET
North Agua Hedionda Sewer Western Segment Project - Biological Assessment
Biological Resources & Jurisdictional Delination Map
with Limits of Permanent &Temporary impacts
FIGURE
6E
t i fti fti i i i i fti fti ft J i i i i Hi i i i i i i t i t i i i i i i «
Onsite
CSS
Mitigotion
RECOMMENDED
•BROW DITCH
Cribwoll
CRIBWALL
Droinoge
Swole
12"
r12" MIN. AGGREGATE
ROAD SECTION
PROPOSED DRILLED
PIER WALL
Ox
SEWER PIPELINE-^
Sewer Access Rood
CALTRANS CABLE RAIL
(WHERE REQUIRED)
CARVED/HAND-SCULPTURED FACE
MEAN HWL (5.5)
Sou
Morsh
intertidol
Rocky
Beoch
Intertidol
Mudflot
NOT TO SCALE
North Agua Hedionda Sewer Western Segment - Biological Assessment
Sewer Access Road Typical Section with Cribwall
FIGURE
7A
fti fti fti fti fti ft fti fti fti fti fti i i i i t i i i i i i i I i i i
PROPOSED 2:1
SLOPE (MAX)
Onsite CSS
Mitigotion
12" MIN. AGGREGATE
ROAD SECTION
2%
Droinoge
Swole
CULVERT (WHERE SHOWN
ON PLAN)
PROPOSED DRILLED-
PIER WALL
Q
SEWER PIPELINE
Sewer Access Rood
CALTRANS CABLE RAIL (WHERE REQUIRED)
2' CARVED/HAND-SCULPTURED FACE
V CN MEAN HWL (5.5)
Intertidol
Soit Rocky Intertidol
Morsh Beoch Mudflot
NOT TO SCALE
North Agua Hedionda Sewer Western Segment • Biological Assessment
Sewer Access Road Typical Section with 2:1 Cut Slope & Culvert
FIGURE
78
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
Based on all biological surveys of the project study area, no other listed species would be
affected by the project.
6.2 Direct Impacts
The NAHI West project site completely avoids designated critical habitat for the federally-
listed threatened California gnatcatcher. However, suitable habitat on the project site
forthe CaHfornia gnatcatcher includes 9.0 acres of coastal sage scrub. Of the 9.0 acres of
coastal sage scrub, 0.3 acre would be permanently impacted by the proposed development,
0.8 acre would be temporarily impacted and 7.9 acres would be conserved.
Breeding birds can be significantly affected by short-term construction-related noise,
which can result in the disruption of foraging, nesting, and reproductive activities.
6.3 Indirect Impacts
Indirect impacts associated with project implementation are primarily adverse edge effects
related to ongoing maintenance and trail activities. Despite construction of trail
amenities which discourage trash dumping, pollution, etc., and limited scheduled sewer
maintenance, these activities still have the potential to significantly impact adjacent
sensitive vegetation communities including coastal sage scrub.
6.4 Cumulative Impacts
Implementation of the proposed project, in conjunction with other projects, would
contribute to significant cumulative loss of biological resources by converting vacant areas
supporting natural habitat into urban land uses. It is anticipated that cumulative impacts
to sensitive biological resources would be mitigated on a project-by-project basis by
preservation and revegetation within project boundaries and compliance with appropriate
permit conditions as determined by resource agencies, including the CDFG, ACOE,
USFWS, and CCC. Also, projects must demonstrate compliance with the Carlsbad HMP
despite lack of final take authorization under this document.
The HMP allows for public projects within the proposed FPA; however, project
conformance includes avoidance and minimization of impacts to covered species and
habitats to the maximum extent practicable. For unavoidable impacts to covered
2798-03
& ASSOCIATES, INC. | May 2004 40
Profe55umaI Teams for Complex Projects
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
habitats, conformance with the HMP requires mitigation at the following ratios: wetlands
^ (no net loss) and gnatcatcher-occupied coastal sage scrub (2:1). Specific conditions of
• coverage for covered species which would be affected by this project include the
restriction of clearing of coastal scrub between March 1 and August 15. Other measures
for coastal California gnatcatcher and salt marsh skipper relate to preserve management
and habitat restoration/enhancement. Therefore, conformance with the HMP requires
«i that the proposed project avoid and minimize impacts to covered species and habitats, not
«i preclude preserve management directives and to the extent feasible, the project and
resulting mitigation measures contribute to these preserve management directives. The
^ proposed project is in conformance with the Carlsbad HMP.
m 7.0 MEASURES TO AVOID, MINIMIZE AND MITIGATE IMPACTS
411 The following proposed mitigation measures are expected to reduce identified impacts to
^ sensitive biological resources to a level which is less than significant. Specific methods for
implementing these measures are provided in Section 6.1 of the Biological Resources
• Technical Report (Dudek 2003). Implementation of the following measures would serve
to avoid and minimize potential direct, indirect and cumulative impacts associated with
^ the NAHI West project to the California gnatcatcher and jurisdictional areas.
In addition, a Mitigation, Monitoring, and Reporting Program (MMRP) has been prepared
for the NAHI West project as required by Section 21081.6 of the Public Resources Code.
• The primary goal of the MMRP is to ensure that during final design, construction, and
^ operation, the project would avoid or reduce potentially significant environmental
^ impacts.
^ 7.1 Avoidance and Minimization
li
mi 1. All clearing of coastal sage scrub habitat shall occur during the non-breeding
ii season of most wildlife; i.e., August 16 to February 28.
^ 2. Construction work areas shall be delineated and marked clearly in the field
prior to habitat removal, and the marked boundaries maintained throughout
m the construction period.
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Professional Teams for Complex Projects
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
3. A biological monitor shall be present during construction and mitigation
programs, shall ensure that conservation measures required in the final SEIR,
resource agency permits, and construction documents are performed in
compliance with those documents and any concurrent or subsequent
mitigation plans.
4. Typical erosion control measures, Best Management Practices (BMPs), in the
vicinity of streams shall be employed.
5. A pre-construction survey of the proposed construction corridor adjacent to
appropriate habitat for the California gnatcatcher shall be conducted according
to protocols recommended by the USFWS and CDFG. The purpose of the
survey is to determine the current status of this species onsite immediately
prior to construction activities.
6. Construction activities within 500 feet of habitat occupied by California
gnatcatchers shall be avoided during the breeding season when feasible; if not
feasible, noise attenuation measures would be implemented to reduce
construction noise levels to 60 dB or below at the location of known nesting
sites.
7.2 Specific Mitigation Measures for California Gnatcatcher
The permanent loss of coastal sage scrub habitat occupied by coastal California
gnatcatcher shall be mitigated through the creation of 0.30 acre of coastal sage scrub
within Agua Hedionda Lagoon and either the deduction of 0.30 acre credits at the Lake
Calavera mitigation bank (yet to be finalized) or creation of an additional 0.30 acre of
coastal sage scrub adjacent to Agua Hedionda Lagoon (Figures 8A 61 SB). The temporary
loss of habitat for the species shall be mitigated through implementation of the Habitat
Restoration Plan {Appendix D). In addition, the potential for direct impacts to coastal
California gnatcatcher individuals shall be mitigated by restricting the clearing of coastal
sage scrub within the project alignment to outside of the gnatcatcher breeding season
(August 16 through February 28).
iif 111 2798-03
& ASSOCIATES. INC. I May 2004 42
Professional Teams for Comjilci Projerti
• 1 mm mm mm i i ma mm § i i i i i m § t i i i i i t i t i i i t i i J
VEGETATION TYPES/LANDCOVERS:
Brackish Marsh BM DH
CCSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
FWM
IM
ORN
Disturbed Habitat
Freshwater Marsh
Intertidal Mudflat
Ornamental
NOTE:
A lower case'd' in front of a vegetation type designator indicates tiiat it
is disturbed.
OW
RUD
SB
Open Water
Ruderal
Sandy Beach
Waters of the U. S.
(liumber indicates width of unvegetated
channel.)
O Data Station
^/y7/^ Proposed Habitat
V/^I Creation
SENSITIVE PLANT SPECIES:
Ap Atriplex pacifica
Ja Juncus acutus ssp. leopoldii
NOTE: Number indicates individual
plant counts at that location.
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher
CAGN General Area of
Calling/Movement
North Agua Hedionda Sewer Western Segment - Biological Assessment
Proposed Habitat Creation Legend
FIGURE
8A
North Agua Hedionda Sewer Western Segment • Biological Assessment
Proposed Habitat Creation Area
FIGURE
8B
m
m
m
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
The potential short-term increase in noise related to construction of the access
road/seawall, sewer line improvements, and manhole rehabilitation shall be mitigated
through avoidance of construction during the gnatcatcher breeding season OR
maintenance of noise levels below 60 dBA Leq at occupied nest locations. The
maintenance of appropriate noise levels shall be confirmed through protocol gnatcatcher
surveys to determine presence of all gnatcatcher within 500 feet of project construction
and noise measurements at nest locations during peak construction activity by a qualified
acoustician.
8.0 ACKNOWLEDGMENTS
This report was prepared by DUDEK biologists Paul Lemons and Dave Flietner and
m reviewed by Vipul Joshi and Sherri Miller. Graphics and CIS mapping and analyses were
if provided by Lesley Terry; Tonette Foster provided word processing.
^ 9.0 LITERATURE CITED
* Abrams, L. 1923. Illustrated flora of the Pacific States. Stanford University Press, Stanford,
* California.
American Ornithologists' Union. 1983. The Check-list of North American Birds, 6th edition.
Allen Press, Lawrence, Kansas.
American Ornithologists' Union. 1989. Thirty-seventh Supplement to the American
Ornithologists' Union Check-List of North American Birds. The Auk 106:532-538.
Associated Engineers. 1965. Plans for the Construction of Agua Hedionda Interceptor Severer
and Dovc^n Tovc^n Force Main.
Atwood, J. L. 1990. Status revievc^ of the California gnatcatcher {Polioptila californica).
Unpublished technical report, Manomet Bird Observatory, Manomet,
Massachusetts. 79 pp.
DUDEK
&ASSCXnATES,INC.
2798-03
Profesjioiul Teonu for Complex Projects
May 2004 45
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
Beauchamp, R. M. 1986. A flora of San Diego County, California. Sweetwater Press,
National City, California. 241 pp.
Bond, S.L 1977. An annotated list of the mammals of San Diego County, California. Trans.
* San Diego Soc. Nat. Hist. 18: 229-248.
Bowman, R. Fl. 1973. Soil Survey, San Diego Area, California, Part 1. United States
Department of the Agriculture. 104 pp. + appendices.
Brown, J. W., Fl. A. Wier, and D. Belk. 1993. New records of fairy shrimp (Crustacea:
Anostraca) from Baja California, Mexico. Southwest. Nat. 38.
Bury, B. 1971. Status report on California's threatened amphibians and reptiles. California
Department of Fish and Game, Inland Fisheries Administrative Report #72-2.
1 California Department of Fish and Game (CDFG). 2004a. At the Crossroads: A Report on
ii the Status of California's Fndangered and Rare Fish and Wildlife. State of California
Resources Agency, Sacramento. California.
California Department of Fish and Game (CDFG). 2004b. Fndangered, Rare, and
Threatened Animals of California. State of California Resources Agency, Sacramento,
California.
California Department of Fish and Game (CDFG). 2004c. California Natural Diversity
Database, Special Animals. The Resources Agency, Wildlife and Habitat Data
Analysis Branch.
California Native Plant Society (CNPS). 2001. Inventory of Rare and Fndangered Plants of
California (sixth edition). Rare Plant Scientific Advisory Committee, David P.
Tibor, Convening Editor. California Native Plant Society. Sacramento, CA
x+388pp.
Dudek &: Associates. 2003. Biological Resources Technical Report for the North Agua Hedionda
Interceptor Project, City of Carlsbad, County of San Diego, California. City of Cadsbad,
California.
2798-03
May 2004 46
ProfcsJioiuI Teams for Complex Projects
m
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
Dudek & Associates. 2003. Final Fnvironmental Impact Report for the North Agua Hedionda
Interceptor Project, City of Carlsbad, County of San Diego, California. City of Carlsbad,
California.
Ehdich, P.R. 1988. The Birder's Handbook: a Field Guide to the Natural History of North
American Birds. Simon and Schuster, Fireside, New York, New York.
Emmel, T. C. and J. F. Emmel. 1973. The butterflies of Southern California. Natural History
Museum of Los Angeles County, Science Series 26:1-148.
Everett, W. T. 1979. Sensitive, threatened and declining bird species of San Diego County. San
Diego Audubon Society Sketches 29:2-3.
m Garrett, K. and J. Dunn. 1981. Birds of Southern California: Status and Distribution. Los
ii Angeles Audubon Society, Los Angeles, California.
^ Grinnell, J. and A. Miller. 1944. The distribution of the birds of California. Pacific Coast
Avifauna 27: 1-608.
Hickman, J. C. 1993. The Jepson Manual: Higher plants of California. University of
California Press, Berkeley. 1400 pp.
Holland, R. F. 1986. Preliminary descriptions of the terrestrial natural communities of
California. Nongame-Heritage Program, California Department of Fish and Game.
156 pp.
Jones, C, R.S. Hoffmann, D.W. Rice, R.J. Baker, M.D. Engstrom, R.D. Bradley, D.J.
Schmidly, and CA. Jones. 1997. Revised checklist of North American mammals
north of Mexico, 1997. Occasional Papers, Museum of Texas Tech University, No.
173, 23 pp.
McGurty, B. M. 1980. Survey and status of endangered and threatened species of reptiles
natively occurring in San Diego, California. San Diego Herpetological Society.
2798-03
Pro/essionol Teams for CotnpUi Projf rtJ
May 2004 47
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
Munz, P. 1974. A flora of Southern California. University of California Press, Berkeley,
California. 1086 pp.
Murphy, D. D. 1990. A report on the California butterflies listed as candidates for endangered
status by the United States Fish and Wildlife Service. Draft Report for California
Department of Fish and Game, Contract No. C-1755. 60 pp.
Reed, P. B. 1988. National List of Plant Species That Occur in Wetlands: California (Region
0). Biological Report 88(26.10). United States Fish and Wildlife Service, Department
m of the Interior.
Remsen, J. V. 1978. Bird species of special concern in California: An annotated list of declining
or vulnerable bird species. Administrative Report No. 78-1. Nongame Wildlife
Investigations, Wildlife Management Branch, California Department of Fish and
Game.
SANDAG (San Diego Association of Governments). 2001 Multiple Habitat Conservation
Program. CD-ROM.
Stebbins, R. C. 1985 and 2003. A field guide to vc^estern reptiles and amphibians. Houghton
Mifflin Co., Boston, Mass.
Stewart, G. R. 1971. Rare, endangered, and depleted amphibians and reptiles in California.
Herpetology 5:29-35.
United States Fish and Wildlife Service (USFWS). 2004. Federally Listed and Candidate
Species that May Occur vc^ithin the Jurisdiction of the Carlsbad Fish and Wildlife Office.
Microsoft Excel Spreadsheet. Provided by: Cadsbad Fish and Wildlife Office.
Carlsbad, California.
Unitt, P. A. 1984. Birds of San Diego County. Memoir 13, San Diego Society of Natural
History. 287 pp.
Wiggins, I. L. 1980. A flora of Baja California. Stanford University Press. 1025 pp.
DUDEK & ASSOCIATES, ESTC.
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
Willet, G. 1933. Revised list of birds of southvc^estern California. Pacific Coast Avifauna 21:1-
204.
Wright, W. S. 1930. An annotated list of the butterflies of San Diego County, California. Trans.
San Diego Soc. Nat. Hist. 6: 1-40.
DUDEK
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APPENDICES
APPENDIX A
9t
« VASCULAR PLANT SPECIES
ii
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
« APPENDIX A
m
m VASCULAR PLANT SPECIES
* ANGIOSPERMAE (DICOTYLEDONES) m
m ACANTHACEAE - ACANTHUS FAMILY
m * Thunbergia alata - black-eyed susan vine
* AIZOACEAE - CARPET-WEED FAMILY
* Aptenia cordifolia - aptenia
m * Carpobrotus edulis - Hottentot-fig
« * Mesembryanthemum crystallinum - crystal ice plant
* Mesembryanthemum nodiflorum - sea-fig
AMARANTHACEAE - AMARANTH FAMILY
m Amaranthus blitoides - prostrate amaranth
•i
^ ANACARDIACEAE - SUMAC FAMILY
^ Malosma laurina - laurel sumac
Rhus integrifolia - lemonadeberry
H Rhus ovata - sugar bush
* Toxicodendron diversilobum - poison-oak
^ APIACEAE - CARROT FAMILY
* Foeniculum vulgare - sweet fennel
<l APOCYNACEAE - DOGBANE FAMILY
* Nerium oleander - oleander
ASTERACEAE - SUNFLOWER FAMILY
Ambrosia confertifolia - weak-leaved burweed
Ambrosia psilostachya var. californica - western ragweed
Artemisia californica - coastal sagebrush
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Pro/tMional Team, for Complex Projtcts
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX A (Cent)
Artemisia douglasiana - California mugwort
Baccharis pilularis - coyote brush
Baccharis salicifolia - mule fat
Baccharis sarothroides - broom baccharis
* Conyza canadensis - horse weed
* Chrysanthemum coronarium - garland chrysanthemum
Fncelia californica - California encelia
Fricameria ericoides - heather goldenbush
Filago arizonica - Arizona filago
* Filago gallica - narrow-leaf filago
Gnaphalium bicolor - bicolor cudweed
Grindelia camporum - gum plant
Hazardia squarrosa - saw-toothed goldenbush
* Hedypnois cretica - Crete hedypnois
Hemizonia fasciculata - fascicled tarweed
m Heterotheca grandiflora - telegraph weed
Isocoma menziesii ssp. veneta - coastal goldenbush
Jaumea carnosa - salty susan
Lessingia filaginifolia - virgate cudweed aster
Pluchea odorata - marsh-fleabane
* Picris echioides - bristly ox-tongue
* Senecio mikanioides - German ivy
* Sonchus asper - prickly sow-thistle
* Sonchus sp. - sow thistle
Xanthium strumarium - cocklebur
m
BORAGINACEAE - BORAGE FAMILY
Heliotropium curassavicum - wild heliotrope
BRASSICACEAE - MUSTARD FAMILY
* Brassica nigra - black mustard
* Cakile maritima - sea rocket
DUDEK
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2798-03
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX A (Cent)
^ Lepidium sp. - peppergrass
* Raphanus sativus - wild radish
• CACTACEAE - CACTUS FAMILY
m * Opuntia ficus-indica - Indian fig
m Opuntia littoralis - coastal prickly-pear
Opuntia prolifera - coast cholla
* CAPPARACEAE - CAPER FAMILY
li Isomeris arborea - bladderpod
CARYOPHYLLACEAE - PINK FAMILY
* Spergularia bocconii - sand-spurrey
CHENOPODIACEAE - GOOSEFOOT FAMILY
m Atriplex lentiformis- big saltbush, quail brush
Atriplex pacifica - south coast saltbush
^ Atriplex patula - spear oracle
* Atriplex semibaccata - Australian saltbush
ii Atriplex triangularis - spearscale
if * Bassia hyssopifolia - five-hooked bassia
* Chenopodium ambrosioides - Mexican tea
* Chenopodium murale - nettle-leaved goosefoot
^ Salicornia subterminalis - Parish's pickleweed
•i Salicornia virginica - common pickleweed
t§ * Salsola tragus - Russian-thistle
Suaeda californica - California sea-blite
CONVOLVULACEAE - MORNING-GLORY FAMILY
Calystegia macrostegia - western bindweed
Cressa truxillensis - alkali weed
Mill
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
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APPENDIX A (CoiitJ
CRASSULACEAE - STONECROP FAMILY
Crassula argentea - jade plant
Dudleya pulverulenta - chalk dudleya
CUSCUTACEAE - DODDER FAMILY
• Cuscuta salina - salt marsh dodder
EUPHORBIACEAE - SPURGE FAMILY
Chamaesyce sp. - spurge
* Ricinus communis - castor-bean
• FABACEAE - PEA FAMILY
^ Lotus scoparius - deerweed
^ * Medicago polymorpha - California burclover
• FRANKENIACEAE - FRANKENIA FAMILY
m Frankenia salina - alkali-heath
* GERANIACEAE - GERANIUM FAMILY
^ * Frodium sp. - filaree
HYDROPHYLLACEAE - WATERLEAF FAMILY
Friodictyon crassifolium - yerba santa
W LAMIACEAE - MINT FAMILY
* Marrubium vulgare - horehound
Salvia mellifera - black sage
MALVACEAE - MALLOW FAMILY
Malocothamnus fasciculatus - mesa bushmallow
* Malva parviflora - cheeseweed
Malvella leprosa - alkali-mallow
May 2004
2798-03
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•I
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NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX A (Cant)
MYOPORACEAE - MYOPORUM FAMILY
* Myoporum laetum - myoporum
MYRTACEAE - MYRTLE FAMILY
* Fucalyptus sp. - eucalyptus
OXALIDACEAE - WOOD-SORREL FAMILY
* Oxalis pes-caprae - Bermuda buttercup
PLANTAGINACEAE - PLANTAIN FAMILY
^ Plantago erecta - dot-seed plantain
PLATANACEAE - SYCAMORE FAMILY
Platanus racemosa - western sycamore
PLUMBAGINACEAE - LEADWORT FAMILY
* Limonium perezii - statice
POLYGONACEAE - BUCKWHEAT FAMILY
Friogonum fasciculatum - California buckwheat
* Rumex crispus - curly dock
PRIMULACEAE - PRIMROSE FAMILY
* Anagallis arvensis - scarlet pimpernel
RUBIACEAE - MADDER FAMILY
Galium angustifolium - narrow-leaved bedstraw
SALICACEAE - WILLOW FAMILY
Populus fremontii - Fremont's cottonwood
Salix exigua - narrow-leaved willow
Salix gooddingii var. gooddingii - black willow
Salix lasiolepis var. bracelinae - arroyo willow
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« NAHI West - Sewer Maintenance, Access road, and Shoreline
^ Protection Project
^ APPENDIX A (Cont)
m
m SAURURACEAE - LIZARD S-TAIL FAMILY
m Anemopsis californica - yerba mansa
• SOLANACEAE - NIGHTSHADE FAMILY
* * Datura vc^rightii - western jimsonweed
m Lycium californicum - California box-thorn
m * Nicotiana glauca - tree tobacco
TAMARICACEAE - TAMARISK FAMILY
^ * Tamarix sp. - tamarisk
m URTICACEAE - NETTLE FAMILY
il Urtica dioica - giant creek nettle
ZYGOPHYLLACEAE - CALTROP FAMILY
* Tribulus terrestris - puncture vine
il ANGIOSPERMAE (MONOCOTYLEDONES)
• ARECACEAE - PALM FAMILY
* Washingtonia robusta - fan palm
m CYPERACEAE - SEDGE FAMILY
* Cyperus involucratus - umbrella sedge
^ Fleocharis sp. - spike-rush
Scirpus acutus - hard-stemmed bulrush
«• Scirpus maritimus - prairie bulrush
il Scirpus robustus - Pacific coast bulrush
JUNCACEAE - RUSH FAMILY
Juncus acutus - spiny rush
• Juncus bufonius - toad rush
ii DUDE
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« APPENDIX A (Cont)
m LILIACEAE - LILY FAMILY
ii Agave americana - no common name
Chlorogalum pomeridianum - soap plant
* Lilium sp. - lily
* Yucca schidigera - Mohave yucca
d POACEAE - GRASS FAMILY
* Arundo donax - giant reed
* * Avena barbata - slender wild oat
* * Bromus diandrus - ripgut grass
fi * Bromus hordeaceus - soft chess
d * Bromus madritensis ssp. rubens - foxtail chess
* Cortaderia selloana - pampas-grass
* Cynodon dactylon - Bermuda grass
Distichlis spicata - salt grass
Hordeum sp. - barley
* Lolium multiflorum - English ryegrass
Nassella pulchra - purple needlegrass
* Paspalum dilatatum - dallis grass
* Poa sp. - bluegrass
* Polypogon monspeliensis - rabbit's-foot grass
* Vulpia myuros - rattail fescue
TYPHACEAE - CATTAIL FAMILY
Typha angustifolia - narrow-leaved cattail
Typha latifolia - broad-leaved cattail
ZOSTERACEAE - EEL-GRASS FAMILY
Zostera marina - eel-grass
signifies introduced (non-native) species
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m APPENDIX B
• WILDLIFE SPECIES OBSERVED OR
•I DETECTED ON THE PROJECT SITE
Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
] APPENDIX B
« WILDLIFE SPECIES OBSERVED OR
DETECTED ON THE PROJECT SITE
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WILDLIFE SPECIES -INVERTEBRATES
CLASS CRUSTACEA - BARNACLES, BEACH HOPPERS, SHRIMPS, LOBSTERS,
CRABS, ETC.
Balanus glandula - barnacle
Hemigrapsus oregonensis - mud-flat crab
CLASS GASTROPODA - SNAILS, LIMPETS, SEA HARES, NUDIBRANCHS,
ETC.
Collisella digitalis - fingered limpet
Collisella scabra - rough limpet
Littorina sp. (probably I. scutulata)- periwinkle species
Lottia gigantea - giant owl limpet
Tegula funebralis - black tegula
CLASS BIVALVIA - CLAMS, COCKLES, MUSSELS, OYSTERS, SHIPWORMS,
* ETC.
^ Mytilus edulis - blue mussel
^ Ostrea lurida - Pacific oyster
Tagelus subteres - razor clam
'•I Argopecten aequisulcatus - speckled scallop
*i Tresus nuttalli - gaper clam
BUTTERFLIES AND MOTHS
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^ HESPERIIDAE - SKIPPERS
«i Hylephila phyleus - fiery skipper
Panocjuina errans - salt marsh skipper
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NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX B (Cont)
PIERIDAE - WHITES AND SULFURS
Pieris rapae - cabbage butterfly
LYCAENIDAE - BLUES, HAIRSTREAKS, & COPPERS
Brephidium exile - pygmy blue
Leptotes marina - marine blue
Blue species
NYMPHALIDAE - BRUSH-FOOTED BUTTERFLIES
Vanessa annabella - west coast lady
Junonia coenia - buckeye
WILDLIFE SPECIES -VERTEBRATES
^ REPTILES
IGUANIDAE - IGUANID LIZARDS
Uta stansburiana - side-blotched lizard
^ BIRDS
m
^ PODICIPEDIDAE - GREBES
^ Podiceps nigricollis - eared grebe
Podilymbus podiceps - pied-billed grebe
PELECAMODAE - PELICANS
Pelecanus occidentalis - brown pelican
ARDEIDAE - HERONS
Ardea herodias - great blue heron
Casmerodius albus - great egret
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APPENDIX B (Cont)
^ RALLIDAE - RAILS & GALLINULES
* Fulica americana - American coot
CHARADRIIDAE - PLOVERS
Charadrius vociferus - killdeer
m
m SCOLOPACIDAE - SANDPIPERS
Actitis macularia - spotted sandpiper
^ Calidris mauri - western sandpiper
Catoptrophorus semipalmatus - willet
Numenius phaeopus - whimbrel
* LARIDAE - GULLS & TERNS
m Larus occidentalis - western gull
^ Sterna caspia - Caspian tern
Sterna forsteri - Forster's tern
COLUMBIDAE - PIGEONS & DOVES
Columba livia - rock dove
Zenaida macroura - mourning dove
TROCHILIDAE - HUMMINGBIRDS
Calypte anna - Anna's hummingbird
Calypte costae - Costa's hummingbird
TYRANNIDAE - TYRANT FLYCATCHERS
Sayornis nigricans - black phoebe
Tyrannus verticalis - western kingbird
Tyrannus vociferans - Cassin's kingbird
HIRUNDINIDAE - SWALLOWS
Hirundo pyrrhonota - cliff swallow
^ CORVIDAE - JAYS & CROWS
Aphelocoma coerulescens - scrub jay
•I
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NAHI West - Sewer Maintenance, Access road, and Shoreline
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APPENDIX B (Cont)
Corvus brachyrhynchos - American crow
AEGITHALIDAE - BUSHTITS
Psaltriparus minimus - bushtit
TROGLODYTIDAE - WRENS
Thryomanes bevcickii - Bewick's wren
MUSCICAPIDAE - KINGLETS, GNATCATCHERS, THRUSHES & BABBLERS
Polioptila californica - California gnatcatcher
MIMIDAE - THRASHERS
Mimus polyglottos - northern mockingbird
STURNIDAE - STARLINGS
* * Sturnus vulgaris - European stading
PARULIDAE - WOOD WARBLERS
Dendroica coronata - yellow-rumped warbler
Geothlypis trichas - common yellowthroat
EMBERIZIDAE - SPARROWS
Melospiza melodia - song sparrow
Pipilo crissalis - California towhee
Pipilo maculatus - spotted towhee
Zonotrichia leucophrys - white-crowned sparrow
FRINGILLIDAE - FINCHES
Carpodacus mexicanus - house finch
Carduelis psaltria - lesser goldfinch
MAMMALS
LEPORIDAE - HARES & RABBITS
Sylvilagus bachmani - brush rabbit
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NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX B (Cont)
GEOMYIDAE - POCKET GOPHERS
Thomomys bottae - Botta's pocket gopher
HETEROMYIDAE - POCKET MICE & KANGAROO RATS
Chaetodipus californicus - California pocket mouse
CANIDAE - WOLVES & FOXES
* Canis familiaris - domestic dog
MUSTELIDAE - WEASELS, SKUNKS, & OTTERS
Mephitis mephitis - striped skunk
* signifies introduced (non-native) species
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APPENDIX C
Sensitive Species Categories
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NAHI West - Sewer Maintenance, Access road, and Shoreline
Protection Project
APPENDIX C
Sensitive Species Categories
Federal
Endangered:
Taxa threatened throughout all or a significant portion of their range.
m
iffi Threatened:
g| Taxa likely to become endangered in the foreseeable future.
^ Candidate:
* Taxa for which the USFWS currently has on file substantial information on biological
^ vulnerability and threat(s) to support the appropriateness of proposing to list them as
^ endangered or threatened species.
Federal Species of Concern
«i Taxa that were formerly Category 2 Candidates for listing as threatened or
endangered. This category is an "unofficiaP' designation for species that may warrant
listing, but for which substantial information to support the listing is lacking.
State of California
Endangered:
Taxa which are in serious danger of becoming extinct throughout all, or a significant
portion, of their range due to one or more causes including loss of habitat, change in
habitat, over exploitation, predation, competition, or disease (Section 2062 of the Fish
m
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ll and Game Code).
Threatened:
Taxa which, although not presently threatened with extinction, are likely to become
endangered species in the foreseeable future (Section 2067 of the Fish and Game
Code).
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Biological Assessment
NAHI West - Sewer Maintenance, Access road, and Shoreline
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APPENDIX C (Cont)
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Rare:
Taxa which, although not presently threatened with extinction, are present in such
small numbers throughout their range that they may become endangered if the
present environment worsens (Section 1901 of the Fish and Game Code).
Candidate:
Taxa which the Fish and Game Commission has formally noticed as being under
review by the Department in addition to the list of threatened and endangered species.
California or CDFG Species of Special Concern
Taxa that appear to be vulnerable to extinction because of declining
limited ranges, and/or continuing threats.
California Native Plant Society (2001)
populations.
Lists
lA: Presumed Extinct in California
IB: Rare or Endangered in California and Elsewhere
2: Rare or Endangered in California, More Common Elsewhere
3: Need More Information
4: Plants of Limited Distribution
Note: Plants on CNPS list IB meet California Department of Fish and Game Criteria for
Rare or Endangered listing.
R-E-D Code
R (Rarity)
1- Rare, but found in sufficient numbers and distributed widely enough that the
potential for extinction or extirpation is low at this time.
2- Occurrence confined to several populations or to one extended population.
3- Occurrence limited to one or a few highly restricted populations, or present
in such small numbers that it is seldom reported.
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APPENDIX C (Cont)
E (Endangerment)
1- Not endangered
2- Endangered in a portion of its range
3- Endangered throughout its range
D (Distribution)
1- More or less widespread outside of California
2- Rare outside California
3- Endemic to California
DUDEK
& ASSOCIATES, INC.
2798-03
May 2004
Profeuional Teomi for Camf>Iex Projerti
^0
APPENDIX D
Habitat Restoration Plan
Conceptual Habitat Revegetation Plan
North Agua Hedionda Interceptor
Western Segment
Sewer Maintenance, Access Road & Shoreline Protection Project
MARCH 2004
PREPARED FOR:
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
PREPARED BY:
Dudek & Associates, Inc.
605 Third Street
Encinitas, CA 92024
iPUDEKI
DRArTCONCEPTLAL HABITAT
REVEGETATION PLAN
rOR THE ^
NORTII AGLA IIEDIONDA INTERCEPI^R JpWER
ACCES8 ROAD, SI10RELINE PROTECTION AND
MAINTENANCE PROJECT/.
CITY Of CARLSBAD,/ilALIEORNIA n"7
Prepared for:
City of CarJsbad\
1635 FaiadayAyeriiic^
Cadsbadi^S^ortua 9200S
\
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DUDEK .ASSOCIATES, INC,
^Tvfessional Teams for Complex Projects
605 Third Street
Encinitas, California 92024
i^untact: Vipul Joshi or Andy Thomson
(760) 942-5147
March 2004
DRArT CONCEPTLAL HABITAT REVCOCTATION PLAN
NORTH AQLA HEDIONDA SEWER - WESTERN SEGMENT
TABLE Or CONTENTS
Section Page No.
SUMMARY IV
1.0 INTRODUCTION
2.0
1.1 Proj ect Description rroject uescription ... • ^ - • -x • • - ^'' ^
1.1.1 Location of Project Alignment and 1 labital Greatujn'Xreas; , . . . . 2
1.2
1.1.2 Project Purpose \.
Project Responsibility and Documentation .,..
1.2.1 City of Carlsbad V *
1.2.2
1.2.3
1.2.4
1.2.5
Access Road/Shorelme Protection Structure Coritractor
Mitigation Site Contractor \.
Project Biologist . . . . .•, , _ .
Construction Personfiel EnvirdniheritalTdiic^tion 9
/
EXISTING CONDITIONS
2.1 Proj ect Alignment
2.1.1 VegetatiOj
Soil
. 9
. 9
. 9
17
dVali^;..:V 17
•Construction, and Long-term Uses 18
19
22
23
nd Values 23
Proposed Uses 26
FE MITIGATION PROJECT 26
Habitats to be Established 27
H^BS'^Tr^iMe Lapse • = . . 33
•48BS>^Estimated Cost • • • • 33
DUDEK I & ASSOCIATES, INC.,
Nortti Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
TABLE Or CONTENTS
Section Page No.
4.0 IMPLEMENTATION PLAN
4.1 Rationale for Expecting Implementation Success
Preliminary Schedule 4.2
4.3
4.4
4.5
4.6
General Outline of Habitat Creation Implementation-'St .Ucgy
\ 4.3.1 Onsite Mitigation - Project AligMent Ar^^? -38
4.3.2 Site A - Offsite Intertidal Wetlai^fc^ti^ion 38
4.3.3 Site F - Offsite Diegon Coastal s\^ Scrub Mitigation 41
Plant Materials and Installation Requir^#ntV. 41
Irrigation Plan . . . . X^. 45
Required Activities During Proje^^^feentation^ 46
4.6.1 Construction Monitom^^^^^yBiologistV 46
Site Preparation . ./. J. ^ --^ •
Soil Export, Impof^nd G^ng ,. v 48
Erosion Contiolf? /. M?^. .49
Constructive® Fencing^ 49
49
estrictions 50
Project Signage
Onsi^^Sstructio,
50
:ies^ 51
udelines 52
itror 52
td Trash Removal 53
bntrol and Repair • 53
Maintei^ce Schedule • 54
5.3.1 jMO-Day Plant Establishment Period 54
Five-Year Maintenance Period 54
SSNITORING PLAN • 55
6.1 Performance Criteria 55
6.2 Habitat Monitoring . • 57
6.3 Monitoring Schedule 60
6.4 Annual Reports • 61
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Profctsianai Teams for CompUx PrtfecU March 2004
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
TABLE Or CONTENTS
Section Page No.
7.0 COMPLETION OF MITIGATION
7.1 Notification of Completion .
7.2 Regulatory Agency Confirmation and Site Tlirnover ^.
7.3 Contingency Measures /.
/
8.0 SELECTED BIBLIOGRAPHY f,..
Ustof rigures )^
Fl
gure 1 Regional Location .. . .N^; 3
gure2 Vicinity Map y:^^-... .\. 4
gure 3 Project Components Map /C':. . . . / 5
gure 4A-4E Biological Resources Ma^^cess j\Oad' Seawall ^gnment Area 10-14
gures 5A-B Biological Resources M^Pote^l Habit^^Greation Area 20-21
Figures 6A-B Crib Wall Profile a^Kioss SeMt)n
28-29
Figures 7A-B Proposed Habita^^ation . . . . < 31-32
gures 8A-K Sewer Acccss^lp^Typicalp^^ Cnbwall and with Cut Slope . . . 39-40
^^^^^^^^
lets toVegetation Communities and Land Cover Types .... 15
Prelimin^^^^P: Schedule 36
Recomm^^^^pecies for Southern Coastal Salt Marsh Plant Palette 42
Recomi^pded Species for Diegan Coastal Sage Scrub Plant Palette 43
Recomffinded Species for Crib Wall Landscaping 44
ft Performance Cnteria for Southern Coastal Salt Marsh 56
Performance Cnteria for Diegan Coastal Sage Scrub 56
T^i£8^ii3'"^ 'visual Performance Cnteria for Crib Wall Landscaping 57
He 5
fable 0
DUDEK & ASSOCIATES, INC.
Preltsslmai Teamu for CampUx Projects
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
March 2004
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
SUMMARY
The City of Carisbad (City) proposes to implement the North Agua Hedionda Interceptor Sewer
Access Road, Shoreline Protection and Maintenance Project (NAHI Pro^^t). Tl^e^AHI Project
is being designed and proposed by the City to restore an existing degra^d acc^s road along the
NAHI sewer and provide shoreline stabilization for the accgs^oad t^^avert fujther undermining
and/or erosion. The purpose of the access road improvements is,:jto allow loutine se^^^
maintenance, cleaning, rehabilitation and emergency ^airs alo:^^e S^^^^^^e^iffiie
existing western segment of the NAHI sewer line. Th^ojec'^^ld resuf^^^rmaneiit and
temporary impacts to sensitive uplands and wetlandslegetStion communities.
Ax
As mitigation for permanent impacts, the City propos^to c
0.01 acre of intertidal rocky beach, 0.40 acre of souUrern coa
Diegan coastal sage scrub on the north shore of^^^fedjonda
of Diegan coastal sage scrub will either be^^^t^'
preserved via purchase of mitigation crg^S at 1
of intertidal mudflat,
i^rsh, and 0.30 acre of
additional 0.30 acre
the lagoon or will be
Mtigation Bank (not yet
finalized). Potential temporary impac^to 0-07 adre of in^^il^udflat, 0.01 acre of intertidal
rocky beach, 0.10 acre of southeriu^astal sal^arsh, <a01 acre of disturbed southern coastal
salt marsh, <0.01 acre of develop^^^d wi^S tidal ji^piction, 0.74 acre of coastal sage scrub,
<0.01 acre of disturbed co^ta^^e scru^^^^^^cre of unvegetated ephemeral stream
channel vvjif be i^i^igate^^^ffioring tl^^^^^nities in place to match pre-construction
conditiqifs^^^fflM^ f^^t o^^^walls proposed with the project will be planted
to establi^^^^Sfeaee sen
The propose^^^^^^llLQad an^^^all would be located along the north shore of the lagoon
within a^^mnat^^^^^^f the existing shoreline. Through this area, the shoreline is
chara^^ed by a sand^^^^^ mudflat that is frequently inundated, a narrow band of coastal
sal^&sh, and coastal sffl^mib of varying degrees of disturbance on variable slopes. The sewer
li^Sccurs at the baseMthe slopes, slightly above the shoreline. Permanent impacts from the
^^t include the ^^rint of the proposed access road and seawall. The proposed access road
)£ cent^^Ki the sewer line, at the grade of the existing manholes, with the shoreline
^^^e (i.e., seawall) directly adjacent rising approximately two feet above the grade
of n^^^^Temporary impacts may occur within a designated corridor outside the limits of
grading and on cut slopes and certain trenching and staging areas along the sewer alignment.
The proposed sites for habitat creation are located on the north shore of Agua Hedionda Lagoon
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Profession^ Temns for CompUx Projects March 2004
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
south of Park Drive between Bayshore Drive and Agua Hedionda Creek. The two proposed
locations were selected from six sites that were analyzed for their mitigation potential m a
Mitigation Feasibility Analysis that was performed by Dudek & Associates, Inc. (Dudek 2003)
m Fall 2003. The two sites that were selected were the sites with the greatest''potential for
creating the proposed habitat types. ^
One of the mitigation sites is an existing unvegetated ba^^in^surrounLlcd by sout|ern coastal sjlt
marsh and intertidal mudflat. This site will be over-|ccavated to remove poc^^, ^^^^^^
backfilled with appropriate soil to a finish elevation gk is t^^™<^ tliq^^t^^f the
existing southern coastal salt marsh habitat that su^^^e basin on tl^^i^t After
excavation, this site will be suitable for the installation (ft-soMiern coastal salt marsh, intertidal
mudflat and intertidal rocky beach.
The second site is located m a nearby upland ar^^^^^ntly s'^^^pon-native vegetation.
The non-native vegetation will be removed^^'he site.v/iil.be res^i/d with a minimum 0.30
acre Diegan coastal sage scrub vegetation^^g^ad^^^^^je^^ this site.
The revegetation of temporary imp^^^ t'^iisite h^Screation areas will be subject to
a five-year maintenance and mo^^ig pr^m. A^pstablishment of appropriate habitat
success criteria, all mitigation obligations wl^tbc consii^ered fulfilled.
. Ji.,.!'.;-*.
DUDEK \&i ASSOCIATES, INC.,
ProfessUmal Teams for C^mpUx Projects MZXU 2004
North Agua Hedionda • Draft Conceptual Habitat Revegetation Plan 2798-13
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
1.0 INTRODUCTION
The purpose of this conceptual mitigation plan is to outline appropriate revegetation measures
for creating and restoring the proposed habitat types at the two creation sit^^d along the
proposed construction corridor. The plan contains a proposed fiv|^^^mtenance and
monitoring program to ensure that the intended habitats ^|||pP in^cordance with mitigation
requirements. This plan presents information on P^^jf^^'^ocati^^^^^^descriptio^lf
permitting requirements, project impacts, revegetatic^xequir pl^tin^tid irriga|i6n
recommendations, maintenance requirements, mopforing methodology>saiid*,restoration
performance criteria. \ , - "
1.1 Project Description
:he North Aguafe&nda Interceptor Sewer The City of Carisbad (City) proposes to impk
Access Road, Shoreline Protection and Ma^^SceTrojecf (NAHlJio^ect). The NAHI Project
is being designed and proposed by the Cit^ ^^^^W '^^^^^^^^-'"^^^^ ^^^^^^
NAHI sewer and provide shoreline stabfeation^^he a^^^S^to avert further undermining
and/or erosion. The purpose o^^^^^ces^pad implements is to allow routine sewer
maintenance, cleaning, rehabilit^^nd ^P^S^^^^^^^^^^ ^^^^g 3,800 linear feet of the
exisiting western segment ^^^^^ ^^^^^^^^^^'^^^^ V70u\d result in permanent and
temporaiY^"pacts to se^^^Mplands a^^^^ms vegetation communities.
As mitig
0.01 acre of
coastal sage
coastal
shore
miti
e City proposes to create 0.16 acre of intertidal mudflat,
of southern coastal salt marsh, and 0.30 acre of Diegan
^^gua Hedionda Lagoon. An additional 0.30 acre of Diegan
reated on the north shore or will be preserved via purchase of
'avera Mtigation Bank (not yet formed). Potential temporary
mudflat, 0.01 acre of intertidal rocky beach, 0.10 acre of southern
salt marsh, <0^^ acre of disturbed southern coastal salt marsh, <0.01 acre of developed
K:tion, 0.74 acre of coastal sage scrub, <0.01 acre of disturbed coastal sage
of unvegetated ephemeral stream channel will be mitigated by restonng
m place to match pre-construction conditions. Additionally, 560 linear feet of
with the project will be planted to establish coastal sage scrub species.
Mtigation requirements associated with the permanent impacts of the proposed project are
calculated using a 4:1 ratio for tidal wetlands and 2:1 for sage scrub. Based on consultation with
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various resource agency personnel and evaluating the proposed project in terms of the California
Environmental Quality Act (CEQA), mitigation for tidal wetlands shall consist of
creation/restoration within the Coastal Zone and the Agua Hedionda watershed. Mtigation for
impacts to coastal sage scrub are required to be at a 2:1 ratio, with at leasVhl habitat
creation/restoration and the remainder as preservation, if any.
The creation and restoration of Diegan coastal sage scrubland intertidal wetlands habitat t\-pcsy
as discussed above, is the subject of this conceptual habitat revegetation plan.
1.1.1 Location of Project Alignment and Habit^3reation Areas
The access road/seawall project alignment area e^ffd^^^^^ sewer alignment from
immediately east of Interstate 5 (1-5), following the'fhorelin^^^^iouth to the southern
terminus of Cove Drive (Figures 1-5). The areanr^^^or hab^ creation is located south of
Park Drive on the north shore of Agua ^^pli^^^^^twee^ayshore Drive and Agua
Hedionda Creek {Figure 2). Both areas li^within^^^^^^^mions of the southwestern
quarter of the U.S. Geological Survc\- •^.5'minute^m*Lu^^^^drangle; Township 1 IS, Range
4W. ^'
The project alignment area incites P^i^^^^^^^^^ disturbed to varying degrees.
The south^ern portion^^^Moj ect ^^^^^^^^^^ several developments including private
residen^^^^^omm^^^^^aunch^^^^it. The habitat creation area is located in an
area tha^fe;feenfecntly^ the California Department of Fish and Game (CDFG) as
part of the^Semfeht^procSsmg^^ Ranch. An existing development occurs on the
western bordert^t"-;
1.1,2/ Project Purposeff
Tlfelprimary purpose
^mporary impacts
he NAHI Habitat Revegetation Project is to mitigate permanent and
vegetation communities, including jurisdictional wetlands, sensitive
l^nd sen^^^public views. In order to provide adequate mitigation in accordance with
"^onmental Quality Act (CEQA), California Coastal Act, California Fish and
G^^^^^id federal Clean Water Act (CWA) and Endangered Species Act (ESA), the City
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Orange
County
Camp
Pendleton
Fallbrook
Riverside County
Oceanside
O
o
Carlsbad '
Vista
San
Marcos
Valley
Center
Escondido
Encinitas
o
o
-z-Del Mar
Rancho
Santa Fe
Mira Mesa
La Jolla
San Diego
•X;
Rancho
Bernardo
Poway
Ramona
Coronado
National
City
Santee
La Mesa
Lemon
Grove
1" = 8 Miles
Imperial
Beach
Chula
Vista
Otay Mesa
Tijuana Mexico
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Regional Map
FIGURE
BASE MAP SOURCE: USGS 7.5 Minute Series, San Luis Rey Quadrangle 1" =2000'
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Vicinity Map
FIGURE
North Agua Hedionda Western Segment • Conceptual Habitat Revegetation Plan
Project Components
FIGURE
3
DRArT CONCEPTLAL HABITAT REVEGETATION PLIN
NORTII AQLA IIEDIONDA SEWER - WESTERN SEGMENT
proposes to create 0.16 acre of intertidal mudflat, 0.01 acre of intertidal rocky beach, 0.40 acre of
southern coastal salt marsh, and 0.30 acre Diegan coastal sage scrub, restore all temporary impacts
to sensitive vegetation communities, and establish coastal sage scrub vegetation on two crib walls
to be installed as part of the project. The project will increase the acreage of Diegan coastal sage
scrub and intertidal wetlands habitats within the Agua Hedionda Lagogn^osystem through
grading, removal of non-native vegetation, installation<of nat^|^^^^6, and long-term
maintenance/management. The increased habitat area will be availafilejo^^dlife that utilize
these habitat types, such as various waterfowl and ^tSe federallyfMfSfftlireatencd. coa^a
California gnatcatcher (Polioptila californica californica) ^ ^
T .2 Project Responsibility and Docum^^ption
The City of Carisbad has the responsibility for prq^^ unplem^mtion is the applicant for
a permit from the Army Corps of Engineers (AG^^^^^rdancev^ith section 404 of the Clean
Water Act, a Section 1602 Streambed Altei:a^^^^^^^^AAUr6m CDFG, a Section 401
Water Quality Certification from the R^ional ^^^^^^^^^ntrol Board (RWQCB), a
Biological Qpinion (BO) from U.S^ish andfWildli^^mce (USFWS), and a Coastal
Development Permit (CDP) frojcflt^e Calij^fnia Coital Commission (CCC). A Draft
Environmental Impact Report (BRpias bc(^preparc;d^ accordance with CEQA by the City
Planning Department.
This dr£ '^ScepLual reve^^^^plan wa^^^ared by Dudek and Associates, Inc. (Dudek), as
a consultanttoiJiei^ity. nS^^^^ responsible for implementing and achieving the
this pl^^^^mi Restoration Plan shall be prepared following issuance requirements prwM:
of permits ^^^^^P^
to all sve<^ conditio
onsiDi^^encies. The final plan will include appropriate reference
ictions.
sbad
project m^mer, the City of Carisbad will be responsible for coordination and
mtjiiJ^^spects of habitat revegetation with the assistance of the Project Biologist,
^solely responsible for administration of contracts for the project including
ath the Project Biologist, Installation Contractor, and Maintenance Contractor.
Decisions to stop work or suspend payment or terminate such contracts is the responsibility of
the City except where-noted herein. This includes all phases of project installation, long-term
maintenance, implementation of erosion control features, and biological monitoring. The City
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may, with sole discretion and at any time, replace any of these parties.
1.2.2 Access Road/Shoreline Protection Structure Contractor
The City currently anticipates constructing the proposed project m twQ|?hases!^1ie initial phase
would include vegetation clearing and grubbing and mstalla^n of ero|^^^k)l measures. This
initial phase would occur outside the nesting bird se^'^fMarchX - August 15) following
acquisition of all necessary permits. The construction^Sase wodd^^n as-soon as poss||>fe
thereafter, but may be delayed because of contract bid ^^war^fSeduresNlJe City will work
to shorten the gap between the two phases of the prop'tos^nmch as possible-iK^^errdue to
the breeding season restriction on clearing of habitat, leasing of the work is necessary.
The initial clearing and grubbing contractor will be respons^ihlc'^or CO plant salvage and
resource avoidance as directed by the Project Biolp^s^Installatioivand maintenance of fencing
demarcating the limits of the temporary^^sb:|Ktbn;easc erosion control Best
Management Practices (BMPs) will also he^'respprisibility of.theMtial clearing and grubbing
contractor. J /
/
The access road/seawall constru^&E^cont^^r will ^^^esponsible for coordinating with the
Proj ect Biologist regarding vario^^nstru^^^ctiA^^strictions such as noise levels during the
breeding s^^, erosion^^^ffisMPs, tencm|,..^^^ education, staging areas, etc. The
contrac^^^^foaintail^^^^^cation^^^^^Project Biologist throughout the construction
period, ^^^^^^^mple^^^^^^oad, seawall, and cribwalls, all temporary impacts areas
shall be rest^^^^^^onst^^^^^four grades and all materials and equipment shall be
removed froi^^^^^^^^ tem^^^^npact areas which did not support sensitive vegetation
prior to ^^^Sc^^^^^^^disturbed, shall be appropriately treated to minimize erosion,
sedimeJ^tion, and col^^^^fflby exotic invasive species. Any unauthorized impacts shall be
imiTO^iately disclosed ^^^entified to the City Project Manager and Project Biologist.
A^opriate remedial assures would need to be taken as soon as possible.
Mitlqafimi Site Contractor
dpates using a grading contractor to excavate the soil necessary to create the desired
grade at the wetlands creation area. The City also anticipates using a landscape contractor for
the installation of the plant materials, irrigation, and long-term maintenance during the five-year
maintenance and monitoring period for the temporary impact restoration areas, cribwall
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revegetation, and habitat creation areas. Under direct supervision by the City, a private
contractor may also be used to implement additional elements of this plan that are beyond the
normal capabilities the grading and landscape contractors. The contractor will be responsible for
conformance to this conceptual restoration plan, resource agency permits,^and contract
documents. The contractor's responsibility may continue until completion of the work and final
acceptance by the City. The contractor will not be releasedTrom cohttaetual obligations until
written notification is received from the City and thejropt Biol^^^^^^g satisfactojy
completion of all required installation tasks as defined m the in^tallafior^pntract.
1.2.4 Project Biologist \
\
The Project Biologist may be a City employee or a privatc-environn^ntal services consultant.
Preparation of this conceptual plan, interpretation^'f the^lan; fieto^^monitoring of access
road/seawall construction and mitigation site' constructio^^^atibn, monitoring of
revegetated areas during the 120-day maint^MB^^^^ biolo^^monitoring throughout
the five-year monitoring period are th^^^nsi^^^^^^^pct Biologist. The Project
Biologist shall coordinate with the City^arding^ttivi^^^^^nd monitoring success of the
project.
Construction monitoring and implementation of^^ccess road/seawall area and the habitat
creation are^^ill occur t^^fout the cMStriictipn periods. Monitoring time may increase
decreasi
Project Bl^^sl
where biologi
indirect imp^
observatig^-^ort t
proje^peficiencies. T
120-a^ plant establish
or
ed by^elg^CTltions aSBohstruction activities. During construction, the
jthe ^^^^^^Manager will have authority to stop work in situations
^^tos, not^^^^^ to be impacted, are in imminent danger of direct or
^^^^QStruo^^Etivities. Each site visit will be documented in an
^construction activities relating to the enhancement plan and any
Sbiologist will conduct four formal site observations during the
iiltpDeriod for all revegetation areas.
itenance monitofing visits will be documented with a checklist of project deficiencies and
lendations^^remedial measures. Monitoring documentation will be provided to the
^^r distribution and to resource agency staff as required or requested.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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1.2.5 Construction Personnel Environmental Education
Education of all project personnel will be conducted prior to implementation of the access
road/seawall and mitigation projects. Before any construction activity begigsjlwhen new
personnel and/or sub-contractors assume responsibilities for the res^ratic^^foject, or when
volunteer labor is utilized, the Project Biologist will meet onsite to reviewtffepriginal conceptual
plan and existing Held conditions. All project personn|rwill be iniormed ot ttie presence
potential presence of sensitive species and habitats ^thin or a^^en^^^^?rojea ^e^.
Information about laws relating to these biological res^rces JjfTbe discussed as parfpfthe
personnel education. The contractors will provide copierOf^atf^ontract docum^^#ncluding
permits, landscape plans, and conceptual plan, to sub-c5^^&. The City and the contractors
will review all aspects of pertinent contract docui^^^cluding,, but not limited to, site
protection, submittal, scheduling of formal site obser\^ations,^lines'of communication, and
persons with stop work authority.
2.0 EXISTING CONDITION^
2.1 Project Alignmen^^a
The following section desc^xsSisting C;
the proje^ragnment.
slopes
easement
staging areas ^S^^^$y:outes
impacts
a maxii^^narea o
and (^ptruction traffl
le landward side o
^^^^rfiin the potential restoration areas along
irect teMj^^^Spacts may occur in three ways: (1) graded
ewer^^^nment outside the road; and (3) a construction
^g and trenching activity that includes three designated
A-F). The first and second categories of temporary
ite shlD^t-term mechanical soil disturbance. The third category is
irt-term disturbance which would likely be limited to stockpiling
mited soil disturbance. In addition, two cribwalls are proposed
access road to limit cut slope impacts to coastal sage scrub. The
I'all locations are iMstrated on Figure 3.
Iiniyegetati^
• I heproject corridor is located along the north shore of Agua Hedionda Lagoon east of 1-5 (Figures
4A-E). Upland habitats and land covers include coastal sage scrub, annual (non-native) grassland,
ruderal, disturbed habitat, ornamental plantings, and developed land. Jurisdictional waters and
wetlands include open water, southern coastal salt marsh, disturbed southern coastal salt marsh
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• • I' ••! r. • •,
ivNisiao iS3a
SEE FIGURE 4B FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Biological Resources index Map - Project Alignment Area
FIGURE
4A
VEGETATION TYPES/LANDCOVERS:
Annual Grassland AGL DH
CSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
EUC
IM
IRB
Disturbed Habitat
Eucalyptus Woodland
Intertidal Mudflat
Intertidal Rocky Beach
NOTE:
A lower case'd' in front of a vegetation type designator Indicates that It is disturbed.
An upper case J foilowing a vegetation type designator Indicates that it is Jurisdictional.
•. 1 Waters of the U. S.
(number indicates width of unvegetated
channel.)
o Data Station
Limits of Permanent Impact
Limits of Temporaiy Impact
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher (Dudek, 2001)
SMS Salt marsh s/c/pper (Dudeia, 2003)
BASE PHOTO SOURCE: CITY OF CARLSBAD
SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. (ADJUSTED TO TOPOGRAPHIC FEATURES)
ORN
OW
ROD
Ornamental
Open Water
Ruderal
SWS Southern Willow Scrub
/ \ / Study Area
Impact Area
Sewer System
CAGN General Area of
Calling/Movement
SENSITIVE PLANT SPECIES:
Ac Adolphia californica
Ja Juncus acutus ssp. leopoldii
NOTE: Number indicates individual plant
counts at that location.
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Biological Resources Legend - Project Alignment Area
FIGURE
4B
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Biological Resources Map - Project Alignment Area
FIGURE
4C
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Biological Resources Map - Project Alignment Area
FIGURE
4D
I SEE FIGURE 48 FOR BIOLOGICAL
I RESOURCES LEGEND
160
SCALE IN FEET
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Biological Resources Map - Project Alignment Area
FIGURE
4E
DRArT CONCEPTLAL HABITAT REVEGETATION PLAN
NORTII AGLA MEPIONPA SEWER - WESTERN SEGMENT
disturbed southem willow scrub, intertidal mudflat, and intertidal rocky beach. Table 1 lists the
acreage of each community with the potential temporary impact areas.
TABLE 1: TEMPORARY IMPACTS TO
PLANT COMMUNITIES AND LAND USE TYPES *
InWgetated ephemeral stream^nnel is an overlay on the vegetation layer and therefore is not included in the total calculations. Numbers
rounding
, which require native habitat revegetation are limited to impacts to sensitive
vegetation^ommunities (intertidal mudflat, intertidal rocky beach, coastal salt marsh, disturbed
coastal salt marsh, coastal sage scrub, and disturbed coastal sage scrub). Impacts to non-sensitive
communities (including developed land within tidal jurisdiction and unvegetated stream channel)
and land cover types only require restoration of pre-construction contours and application of
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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appropriate BMPs {e.g., non-habitat forming/non-invasive erosion control seed mix application
and temporary fiber rolls). The following is a brief description of those native habitats that will
be subject to temporary impacts and thus require onsite restoration.
Intertidal Mudflat
Intertidal mudflat areas include all of the sandy shor^C)cated within the normal tide flcjw
between highest tide (4.91 ft AMSL) and mean lower^ow tide^.GS^^^V^L^ Thi^^a
contains little vegetation aside from algae, but it is iJs|d^r for|S^g ^y so^^^j8i^s#fhis
habitat occupies the majority of the intertidal zone w^^^^^roject corrido^^fifiofigh this
area contains mostly sand, it is not considered a sandy beacfe^calise it is regularly inundated and
does not have the loose soil composition typical of a sandyl)eaeh community.
Intertidal Rocky Beach
The rocky intertidal areas in the project^:;-. C' -ri ist of exposed bccii' >• 1 md rip-rap probably
remnant from the shoreline protection afsociatedtfvith construction of the sewer line and access
road in 1965. All rocky intertidal habipt with^the projegrcorridor is unvegetated. Two rocky
intertidal areas were identified; o^^focate^ear the^fidle of the project (approximately 200
ft in length) and another small^^a (apn^pnatel^O^'ft in length) is located near the eastern
terminus o^^he project.
Southern^oastal Salt Marsha
'fit'' - ' ^^^^^^^^^F
Onsite, soutlicm coastaliSalt marshi)ccurs below ten feet in elevation, adjacent to the sandy or
rocky sh^Tine. "^ yP^M^^^fo^^d ^^^^ {Distichlis spicata), common pickleweed
virginica), ^^^^^^^(I^^^^^ carnosa), spiny rush (juncus acutus ssp. leopoldii) and
{Atriplex spp.).^^^Sal salt marsh patches are present in a variety of sizes and are
col^ntrated in the weMrn region of the project site. Four large patches of salt marsh are located
shoreline n^Hoover Street and near the middle of the project adjacent to the rocky
tbem^Snder of the project site southern coastal salt marsh is interspersed with
sage scrub habitats.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
Disturbed Southern Coastal Salt Marsh
Three areas of disturbed southern coastal salt marsh are mapped in the eastern portion of the
project corridor. These patches support salt grass and other indicator species but also several non-
native species including Bermuda grass {Cynodon dactylon) and several e.scaped exotics from
adjacent landscaping. /i-^-'^-vA.
Coastal Sage Scrub ' •
MjJ^ "^^^ ^^^^^^^^^^^^^^^^^^^
Coastal sage scrub is the most common upland habitat alongj^e piojeci coiiidor,^oastal sage
scrub habitat extends landward from the southern coas^^|^^sh and ruderal habitat. This
habitat type is dominated by California sagebrush^(An^^^^^/c^); black sage {Salvia
mellifera), California encelia {Encelia californica), CalifSnia bi^M^^£r/ogottww fasciculatum),
coyote brush {Baccharis pilularis), lemonadeberg^|||^ggr/f()/^^^^aw sumac {Malosma
laurina), but also includes pampas grass {Gort^t^^i^a)^nd pri^y-pear {Opuntia littoralis).
/
Disturbed Coastal Sage Scrub
Five areas of disturbed coastal sa^eiscrub 'mappe^h the project corridor. These patches
contained lemonadeberry, laurelfumac, Ua^^^^^ other indicator species, but they also
contained seVcial non-nafiVe*species incli^^^^^as, hottentot-fig {Carpobrotus edulis), curly
dock (Ruinex.crisrus), liorehoxind.yiAlatru^^^Mgare), and slender wild oat {Avena barbata).
)edH:oastaI'sage scrub ori^mupp( Disturbccl-
species.
supports 20 to 50% cover by coastal sage scrub indicator
2.1.2
g to Bowman (^^^ere are two soil types found onsite: Carisbad gravelly sandy loam
.arina loamy coarffsand. Within the temporary impact areas, most areas should be subject
ely little S(^^sturbance {e.g., stockpiling, vehicular trafficj. For the 2T slopes on the
Wkrd side nf^ti^ccess road, the finished soil material will be native exposed cut slopes.
Functions and Values
The habitats subject to temporary impacts represent relatively undisturbed native communities
with a typical species composition for the area. One sensitive plant species occurs within the
project corridor, southwestern spiny rush; two sensitive animal species occur, the federally-listed
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
threatened coastal California gnatcatcher and salt marsh [wandering] skipper (Panoquina errans).
Habitat loss and direct impacts will affect each species, however each of the species is expected
to persist at relatively similar population levels post-project implementation.
The diversity of birds is limited due to the small amount of habitat ^^e^yely low habitat
quality. Habitat quality for reptiles and amphibians is lo^^^i the^&^^of these species is
expected to be low because of the small amount of habita^plHable arS^^E^gegative effe^s
of the adjacent urban development. A number of mterudal invert^a^^^^^^^ge ob^^d
or are expected to occur both within mudflat habitats ^^^^ ^^^^^""^^^^^"^^^ ^one.- The-Jhudflat
species include mud-flat crab {Hemigrapsus oregonens^^^^^vjorms and o^^^ft bodied
invertebrates. Within the limited areas of rocky i^t^^^^^^at, clusters of blue mussels
{Mytilus edulis) and barnacles {Balanus glanduli) weic^^^^d-witli scattered individuals of
various limpet and snail species.
2.1.4 Present, Post-Construction, and Long-term Uses .
The project area consists mostly of vaca^Fland supportir^^^ertidal zone and hillsides/bluffs
with native scrub habitat. Several ^^^s and busingses also occupy portions of the study
area.
The propo^^proj^ct
permane^^^^joad,
regional
reduce eevers^Welopments to the area. These include a
walls,^^^^ewer maintenance activities, and a designated
escribed below.
erallvil2 feet wide and constructed of decomposed granite with the
foot section east of manhole number 19, where the alignment
unch). In addition to the 2,400 feet of decomposed granite
approach road from Hoover Street is proposed. The access road
ct and convey storm water runoff to appropriate drainage points along
seawall.
cection wall would include a sculpted face colored to simulate a natural bluff
adj^ai^ffitiimi^lagoon edge. The shoreline protection wall would extend approximately 1,800 feet
from manhole numbers 10 to 19. The height of the manholes in relation to the shoreline varies
and therefore, the height of the wall, in relation to the shoreline, varies from no exposed wall to
approximately sbc feet of exposed sculpted wall (Figure 5). The shoreline protection wall would
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be constructed with a drilled pier foundation (also referred to as a cast-m-drilled-hole [CIDH] pier
wall or auger cast pile wall) which allows for a reduced construction corridor.
Crib walls are proposed in two areas to avoid large cut slopes. The location and the dimensions
of the crib walls are illustrated on Figure 3. The crib wall is a plantable surfac^nd will be an
earth-tone color, if available.
The City of Carisbad Public Works would perform roi^me'^aintenaiiccon the bcwer pipe|Je
and associated manholes following construction of the access road. XoutmeYi^mteAn
would require the use of a vacuum/ water jet pump vel^^^^^ accumulatec^^g|rom the
sewer pipeline and manholes. Other routine maintena^^gofllH include inspectiofMfThe access
road, shoreline protection wall, cable railing and drainageswale. There maintenance tasks would
be performed by City of Carisbad Public Works p^6nnelxm.'.a bi-annual basis outside the
breeding season with visual inspections occurringas^^uently as^_onffl^|:hroughout the year.
All activities are expected to remain conflned to the access road area, '.
The regional trail designation would occur from t^-endl^^^^Fde-sac at Hoover, east along
the alignment, for the length of the sh^line pr^rction ^^^Btgure 3). Trail amenities designed
as part of the project would be l^^p at tl^^d of tl^ul-de-sac at Hoover Street and near
manhole number 19 and includ^^age c^^ibing t^^n:ules and regulations, trash cans and
waste dispo^ facilities for
end of thc-'^S^de-sac at Mfc^Kitreet
pate rcstSl;in^-"«^^cular access would also be located at the
iCreafionfArea
The two
shore o^^ua Hedion
irea is currently
exreijus east to El
lement processi
^wetlands
Cai
:at
for ^^itat creation are located south of Park Drive on the north
etween Bayshore Drive and Agua Hedionda Creek {Figure 2).
nd that was part of the larger Kelly Ranch ownership which
al and south, across the lagoon, to Evans Point. As part of
'or development of Kelly Ranch, the developer dedicated 186-acres of
land to CDFG, including land on the north shore.of the lagoon in this
^aluated a 54-acre area extending from the shoreline to Park Drive and
patches of disturbed land (Figure 5A-B). Dudek conducted a mitigation
feasT^tyanalysis for the area which identified six potential habitat creation sites (Sites A-F).
The feasibility analysis took into account existing physical features of the land as well as current
ownership and planned development. Based on the highest likelihood of long-term successful
habitat restoration, two sites were chosen to mitigate permanent impacts of the NAHI project.
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Proftsdand Teams for CooipUx ProjecU March 2004 19
VEGETATION TYPESAANDCOVERS:
Brackish Marsh BM
CCSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
DH
FWM
IM
ORN
Disturbed Habitat
Freshwater Marsh
Intertidal Mudflat
Ornamental
NOTE:
A lower case d' in front of a vegetation type designator indicates that it
is disturbed.
OW
ROD
SB
Open Water
Ruderal
Sandy Beach
. 1 Waters of the il. S.
(Number indicates width of unvegetated
channel.)
o Data Station
r— I I I
L..
'1 Proposed Habitat
.J Creation
Approximate Property
Line Location
SENSITIVE PLANT SPECIES:
Ap Atriplex pacifica
Ja Juncus acutus ssp. leopoldii
NOTE: Number indicates individual
plant counts at that location.
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher
CAGN General Area of
Calling/Movement
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Potential Habitat Creation Area Legend
FIGURE
5A
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Biological Resources Map - Potential Habitat Creation Area
FIGURE
5B
DRArT CONCEPTUAL HABITAT RCVEOCTATION PLAN
NORTII AGLA LICDIONPA SCWCR - WESTERN SEGMENT
The offsite area proposed for coastal salt marsh, intertidal mudflat and intertidal rocky beach
mitigation is a shallow basin surrounded by existing coastal salt marsh and intertidal mudflat on
three sides and coastal sage scrub on the fourth side (Site A). The offsite area proposed for coastal
sage scrub mitigation is surrounded by an unvegetated dirt access road, Park Drive^ and existing
coastal sage scrub (Site F). Existing unvegetated dirt access paths ii^he ar^^buld provide
vehicular access to both of the potential mitigation sites. The lolloj^ing is'acscripiion of the
existing conditions of both Site A and F.
2.2.1 Vegetation
Site A
Site A is approximately 1.12 acres in size (Figur^''--^A-l^)'^~li'is-<a basin surrounded by
approximately two to threeToot high berms on^^west, ea^t;^rid south sides. The berms
surrounding the basin contain gaps that are ^^^^^^^&Jy ^^^^^ the basins.
The gaps in the berms connect the Site A b^^^^^^^^^^tos east and west sides, and
to the lagoon on the south side, that supi3^ffi southmi^^^^Sl^^arsh and intertidal mudflat;
however, the basin within Site A is a
of these native communities, and^^tt, re
marsh habitat is dominated by i5^Hewee
berms surrounding the
sage. The
disturbc laSkzoasta
approxima
SiteF
fi, precluding the establishment
s prima^ unvegetated. Southern coastal salt
{Frankenia salina) and salt grass. The
fe scrub habitat, dominated by California
transitions from disturbed habitat to
5.4-5). The elevation at the site ranges from
:en feet AMSL. ^^M£et to'
^^^^^^^^^^
approximaicly^^^^res in size and currently supports non-native ruderal vegetation
lated by fennel (Men^ulum vulgare), black mustard {Brassica nigra), and prickly-lettuce
ica serriola) {Figur^pA-B). The area is surrounded by an unvegetated dirt access road on the
iast, southeas^^nd south sides, Park Drive on the northwest side, and a patch of big
W^MUi^^^ntiformis) on the west side, which is associated with coastal sage scrub habitat,
^ted understory of pickleweed and salt grass {Figures 5A-B). Beyond the
unvegetated dirt access road, vegetation consists of ruderal and coastal salt marsh species,
including black mustard, brome grasses {Bromus spp), Australian saltbush (^triplex semibaccata)
and Hottentot fig in the ruderal areas and salt grass, pickleweed and alkali heath in coastal salt
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
ProfesdomdTtams for CompUx ProjecU MarCh 2004 22
DRArX CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA MEPIONPA SEWER - WESTERN SEGMENT
marsh habitat. Beyond the ruderal and coastal salt marsh habitats is a large area of freshwater
marsh to the east and south, dominated by cattails {Typha latifolia).
2.2.2 Soils
According to Bowman (1973), soils at the proposed mitigation areas c^g^J^idal Flat at Site
A and Las Flores Loamy Fme Sand at Site F. Tidal Flats ar|^nodicaI^p||^^ith tidal water
and are either barren or can support a sparse salt-toler^tlvegetatioiar The textuie of ^he^I
ranges from clay to very fine sand (Bowman, 1973) liipiores Loatri^^ine^^^^^^^|d^il
type that consists of moderately well drained loani)' fine-sands that have a^^^^^^tibsoil
(Bowman, 1973).
2.2.3 Functions and Values
Both of the proposed mitigation sites. Sites A and F, currei}tly pro>i^platively few, depressed
biological functions and values. Site A is p^^^tnvegetatec^^ exception of the berms
that surround the basin which support Die^ cQ^^^^crub vegetation, and Site F is
dominated by non-native vegetation^cludin^nnel (l^^Pt, Most Invasive Wildland Pest
Plants; Widespread) and black mu^^List l^pldland^st Plants of Lesser Invasiveness), both
invasive plant species, accordin^^K Cal^iia I^v^^ Plant Council (Cal-IPC; 1999). The
present funcji. .n; and values oi^es A an^Src^e^^ed in more detail below.
Hydrol^ic^Functions and^alues
Site A
north shore pa Fiedionda Lagoon, which connects to the Pacific Ocean. The
Tiigh-tide elevation. The lower portion (approximately one-
to tidal inundation at the highest of the high tides (above 6.6 feet
^tion of the site lacks tidal inundation and only experiences minimal
surrounding areas during rain events. There is a nearby storm drain
ly 200 feet to the west that introduces fresh water to the lagoon, and has
^ruitment of freshwater and brackish water habitats near the outfall. Fiowever,
^enough away from the storm drain outlet that adjacent habitat to the west is
southern coastal salt marsh and intertidal mudflat.
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PRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEPIONPA SEWER - WESTERN SEGMENT
The current hydrologic functions and values of Site A are short-term surface water storage during
high tides and long-term subsurface water storage. The values of short-term and long-term water
storage functions at the site are the support of limited algal growth which can support fisheries
and wildlife, and limited flood control. ^,
SiteF
g
/
Site F is adjacent to wetlands associated with the mouth p||Agua Fie^undl^reekas it enters igto
the lagoon. While the creek may recharge the water tawe under^tlT Site ^li^^surface • i\\iidlogy
at the site is limited to runoff during rain events. Site j^^^^ply level, wi^^^^^fation
of approximately 21.5 feet AMSL and a low elevation o^^^ffimately 18.5 feet S^'SL. If there
is sufficient surface water from a rain event to lesulMri-.surfa'ce, flow, it would be directed
downslope south and east toward the lagoon as. i .L a lio'.'.' Hicrc are n^' channels or depressions
of note in Site F that collect stormwater. ^
to alleviate flooding, moderate the soil^tnperat
and recharge surficial groundwat
Biogeochemica/ Funct/on^a^ Value
Site A
Currently, the
patches of
coastal J^F scrub sp
botto^d basin include
md trap to im
iction from ben
soil moisture for plant growth.
^^^rily barren, with the exception of some sparse isolated
rrounding the basin are sparsely vegetated with Diegan
^eochemical functions and values of the unvegetated sandy-
nutrient cycling by bacteria to support algal growth, sediment
ater quality and lessen coastal erosion, and minimal primary
diatoms and algae to improve water quality, bind sediments thereby
resuspen^^erosion, and fuel benthic food webs. The isolated patches of vegetation
^tated berms provide limited nutrient cycling by the deposition detritus into
fuels microbial food webs.
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PRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEPIONPA SEWER - WESTERN SEGMENT
SiteF
Site F currently supports nutrient cycling and organic carbon export functions. Vegetation at the
site is dominated by non-native fennel, black mustard and prickly-lettuce, which introduce
detritus into the system to fuel microbial food webs. Lfov/cver. vegetatiorf is sparse, and
consequently, these functions are depressed at the site. / /
Habitat Functions and Values
Site A
Currently, Site A provides limited habitat functions because tfiefe is yeiy little vegetation present
onsite. The vegetation present onsite does, howev^f'pro^^^^^^functions. The sparsely
vegetated berms provide wildlife habitat; howeve^^^^habitat^^^^^Md isolated from high
quality native habitat. Other functions of ^^mbkatjonsite ina^^^Smary and secondary
production to support food webs, see(^^^^^mon\='^^^ production and
accumulation of detritus to fuel microl^^^tivitidPmdjec^^ nutrients to support plant
growth. Each of these functions is de^essed a^me site^cause of the lack of plant diversity,
which limits the diversity of prima^§hd sec^pary pro^^ers, variety of seeds as food sources,
and diversity of detritus for mi(^^K and ^Miauna.^me lower portion of the basin that gets
inundated by high tides n^htffovide li^^^^^^R^ for primary producers such as benthic
diatoms an^leae and prd^^Toraping hSoit^^^^aterfowl.
Site F
The high ciegrce^£;^^^s^e sp?<;ics dominance within Site F severely limits the habitat
functiootj^or wildlife^^^^^^ The site is dominated by non-native species, which provides
nesting habit^^^^ras and limited foraging habitat for wildlife. Other functions of
fabitat onsite inclMe primary and secondary production to support food webs, seed
iction to suppo^pvildlife, production and accumulation of detritus to fuel microbial
fg of nutrients to support plant growth. Each of these functions is also
'because of the lack of plant diversity, which limits the diversity of primary
Reducers, variety of seeds as food sources, and diversity of detritus for microbes
and sonrauna.
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for C*mpUx Proi€CU March 2004 25
PRAET CONCEPTLAL HABITAT REVEGETATION PIAN
NORTH AGLA HEPIONPA SEWER - WESTERN SEGMENT
2.2.4 Present and Proposed Uses
Current uses for the proposed mitigation sites and adjacent areas include passive and active
outdoor recreation use, open space, wildlife habitat and tidal and non-tidal floo^torage. The
area is also used by individuals for riding bicycles, jogging and walking,dogs. GDFG has begun
management activities on the site by first installing signage indicating tfiat the land is public land
dedicated towards the preservation of natural resources. / . ' ^
As a CDFG preserve area, the primary long-term use <^i^e site w^J be U^Ovpreseryatio^^f^^^
and wildlife species. The proposed mitigation sites woi^^^^^^ailable hal^it;atf9i:numerous
sensitive species already present in the lagoon ecosyster^-.The habitat creation sires'%ould have
improved function as open space, wildlife habitat, passiv^^^^^^nd tidal and non-tidal flood
storage following implementation of this project. Aft;^&i^^^^^^ of this mitigation plan.
the areas will continue to be managed and maintained by CDFO^ut^^^nagement activities
will likely include designation of trail use areas;'and .giiidelineSTi^^pte disposal areas, and
interpretative signage. / ^ ... •. /"
3.0 GOALS OF THE Ml PROJEOT*
The primary goal of the NAHI ^|bitat Rei^egetatio
temporary bipacts to
replacemei^msre-cons^^^^^^iological^
'oject is to mitigate for permanent and
veget^^^^^^^nities and public views by ensuring
^"^"^'"'^Thetic conditions and "no net loss" of wetlands
within
upland
will prevent
Additional
followii
xosyst xroject will increase the acreages of intertidal wetlands and
|ation of native container plants, cuttings, and seed, and
-native weeds onsite through regular maintenance,
^ectives of the onsite mitigation program include the
Avoid disturMnce to existing saltmarsh habitats during implementation of the NAFil
mitigatior^m) j ect.
Salvag^^o reuse existing native plant species located within the project impact area
.mi^Kaximum extent practicable.
mnize indirect impacts such as erosion, sedimentation, noise, trash, etc. during
revegetation activities.
Prevent any impacts to threatened or endangered native plant and wildlife species.
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North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
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PRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEPIONPA SEWER - WESTERN SEGMENT
3.1 Type of Habitats to be Established
Cut Slopes
The landward side of the proposed access road will require cut slop^^^at a^l^ade in some
locations. These cut slopes will require revegetation with coastal sage^gbgecies typical of this
area, including California sagebrush, black sage, Califoi niaencelia, Califomiabuck\\'heat. ^'oyote
brush, lemonadeberry, laurel sumac, bladderpod {Isotneri> atlvrca)f,^\mi wild i^v (/-^'y|ws
condensatus) and white sage {Salvia apiana), among others. ApproxifnateK' 0.-19 acre 6f cut-siopes
are designed into the project (Figures 4A-E). \ \
Crib Walls
Two crib walls designed as part of the project ^^^^^lanted\<ith:coastal sage scrub species
{Figures 6A-B). The wall would be suited tos^^^ra^-.and native'grisses; therefore typical
species would include California sagebrush^'^^^^^^SlSia ep?Sia, California buckwheat
and coyote brush, among others. /
,../
Trench Areas /
Trenching for sewer repla^feient r- r. cxpected.tpmpact sensitive habitat and therefore no
revegeta^(^-3%cquired^||v^^^ V^|^
Temporary^Q^p^ction
3tockp4 ^ activities may occur within the temporary construction
mi access road on landward side and five feet beyond proposed
^ximately 40 feet total) (Figures 4A-E). Not including the
nent impacts an^heTutslopes areas, the construction corridor occupies a 1.89-acre area
fsting of 0.18 acr^^ intertidal wetlands and 0.57 acre of coastal sage scrub.
Construct^
corrido]^^ feet beyoil^I<J
seavgr on seaward si^
P
the construction corridor would be revegetated with coastal sage scrub of
^9^^^^^^^currently present in the area. Seaward portions of the corridor will require
replanting for coastal salt marsh but would be limited to re-establishment of pre-construction
contours for intertidal mudflat. Any rocks removed from intertidal rocky beach areas would need
to be replaced following construction.
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27
RECOMMENDED
BROW DITCH-GROUND
LINE
TOP OF WALL
0.33'
GROUND
LINE
NOTE: See Figure 3 for cribwall
locations & Figure 6B for
cribwall profiles.
* - BATTERED VERTICAL
INCREMENT 0.97'
FOR STD. 1:4 BATTER.
NOTE:
"X" MARKS FALSE
HEADERS. ALL
OTHERS ARE
FULL HEADERS.
TOE OF WALL
SECTION A-A
FRONT STRETCHERS
(TYP.)
TOP OF WALL ALTERNATING JOINTS
(TYP.)
TOE OF WALL
TYPICAL CRIB WALL ELEVATIONS
NOT TO SCALE
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Typical Cribwall Elevations
FIGURE
6A
APN 206-•
1^ o I Ol
T
o
CM
z CL <
Ij >
270± LF
•172-03 1
1 4' MAX. L_4' MAX. X
<
APN 206-172-05 ^ K 6* MAX. I—f
CRIBWALL NO. 1
292± LF
APN 206-200-01 APN 206-200-02 CM
CRIBWALL NO. 2
I APN
I 206-200-03
Cribwall Elevations
NOT TO SCALE
NOTE: See Figure 3 for cribwall locations.
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Cribwall Profiles
FIGURE
6B
DRArX CONCEPTLAL HABITAT RCVCQCTATION PLIN
NORTII AGLA HEDIONDA SEWER - WESTERN SEGMENT
Site A - Intertidal Wetlands Creation
The target habitat types to be created at Site A include southern coastal salt marsh, intertidal
mudflat and intertidal rocky beach (Figures 7A-B). Southern coastal salt marsh WLII^^ dominated
by pickleweed, alkali heath and saltgrass. This community type \vill be siimlar in vertical
/ ^^^^^
structure and spatial composition to the existing vegetation in the immegk|e^tinity of the site.
All plant species to be utilized on the site are shown in Section44 - PlmWInurials and Installation
Requirements. / •• / ^ --V- /
Currently, the elevations at Site A are too high to alfowTdl^idSl inundation^ Additionally,
existing berms on three sides of the basin preclude norn^ffiSMl^shing. At the higffSFhigh tide,
tidal inundation reaches into the lower one-quarter of th^^^^rading is proposed to bring the
mean high tide line back to the north edge of the basi^Sd^^eatet^appropriate conditions
for full tidal inundation in the entire basin on a rcgular.basis. OMe^he^^^ grade is low enough
to allow full tidal inundation during high tides, hydrologic functionS'£it|^?site will include water
storage. /^''""^^S!'-
/ / '
The creation of southern coastal salt n^sh, mtemdal mu^atend intertidal rocky beach habitat
at Site A is intended to expand up^^pisting^^ive wetl^p habitats adjacent to the mitigation
site. In order to accomplish this ^^^solat^ffitches^^astal sage scrub on existing berms will
be impacted An estimat^^.^acre o^^^^^^^^^crub would be impacted and require
replacem^^^^a 2:1 ^^^^^fci^ ^^^^^^^^^^^'-^^ creation site. Associated functions
accomp^^^^^^ropo^^^^^^reation, include improved habitat quality for invertebrates
and vertebr^^^^^^ed fo^^^^^to^uctivity onsite, and improved terrestrial and aquatic
micro-habitats^^^^^depres^^^^^primarily unvegetated basin.
Creation
habitat typeM) be created at Site F is Diegan coastal sage scrub. Diegan coastal sage
dominat^S'by California sage, California buckwheat, laurel sumac and white sage
are dominant plant species in the impact area. In addition to these
5, the Diegan coastal sage scrub habitat will include, coast goldenbush
and coyote brush, which are dominant species in the adjacent patch of native
)itat.
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Prefesslond Teams for CompUx ProjecU March 2004 30
VEGETATION TYPES/LANDCOVERS:
Brackish Marsh BM
CCSM
CSS
DEV
Coastal Salt Marsh
Coastal Sage Scrub
Developed Land
DH
FWM
IM
ORN
Disturbed Habitat
Freshwater Marsh
Intertidal Mudflat
Ornamental
NOTE:
A lower case'd' in front of a vegetation type designator indicates that it
is disturbed.
OW
ROD
SB
Open Water
Ruderal
Sandy Beach
Waters of the U. S.
(Number indicates width of unvegetated
channel.)
O Data Station
Proposed Habitat
Creation
SENSITIVE PLANT SPECIES:
Ap Atriplex pacifica
Ja Juncus acutus ssp. leopoldii
NOTE: Mumber indicates individual
plant counts at that location.
SENSITIVE ANIMAL SPECIES:
CAGN California gnatcatcher
CAGN General Area of
Calling/Movement
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Proposed Habitat Creation Legend
FIGURE
7A
iPotential J
Developed
[Area ^Proposed • - Proposed CSS|
J>EV
I^J^^y Access fc/V^ Creation Area i ^A/wK
^-'Route (0-3 Ac.) i^J\^-^^^
Fwir
CSS CSS
CSS
CSM IM
RUD CSM
SB
dCSi
IM 50
RUD
DH
OW CSS CSM
Proposed Wetlands
Creation Area
(0.6 Ac.)
Site A
^/^^ Proposed Habitat Creation
Potential Developed Area
/ ^ J Proposed A«ess Route
SEE FIGURE 7A FOR LEGEND
AERIAL BASE MAP SOURCE: AERIAL ACCESS LLC, JANIMAR 2002
ra7(
RUI
DH
IM
RUI
IM/
idC
CSI
Potential CSS
Creation Area
(0.3 Ac.)
- Site F
IM IM
200
Scale in Feet
North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan
Proposed Habitat Creation Area
FIGURE
7B
DRArT CONCEPTLAL HABITAT REVCOCTATION PLIN
NORTH AGLA MCDIONDA SCWCR - WCSTCRN SCGMCNT
As explained eadier, permanent impacts of the access road/seawall project require a minimum
of 1:1 habitat creation. As such a minimum of 0.30 acre of coastal sage scrub creation will be a
created. However, an additional 0.18 acre is required due to impacts to coastal sage scrub on Site
A. Also, the City is required to preserve an additional 0.30 acre of coastal sage scr^occupied by
California gnatcatchers for permanent impacts of the project. If adequate prese^lon of coastal
sage scrub cannot be achieved, the required acreage will bejreated ^^it|^^or a total of 0.78
acre. If this takes place, the revegetation will also be reqi^6d|o dem^^gra^giitability for use
by California gnatcatchers. The habitat creation are^§^ajrrentl>^^^^g^ P^^^^
gnatcatchers; one located north of Site A and another v^'t of Sit^^i^wr?lB«IMliDerma#nt
coastal sage scrub impacts are mitigated through habi^^^^Jira goal
effort will be to establish suitable habitat for existing ^^^^^^ P^^^^-
of ^^a^tion
In an effort to establish a weed-free buffer zone
practicable, non-native plants on the upland portbns of the
removed as part of this plan. Appropriate nati\^upland:spccies
California encelia, and California buckv^^^^il^befestabjishec
disturbance areas that are located in upland areas^
3.2 Time Lapse
•evegetation
Ipla
soutli
The variou
anticipa^
It is like
habitats wi
However, all
develop ii^
comm^^mes and
Sib habitats to re]
r
expectedkbl
XQ the maximum extent
iO-foot buffer will be
California sagebrush,
r erosion control on all
ome
)nn1
op at different rates, even though it is
and se^^^^^be installed at approximately the same time,
marsh, intertidal mudflat and intertidal rocky beach
uickly than the Diegan coastal sage scrub habitat.
Krs of maintenance and monitoring to ensure that they
Based on previous restoration experiences with similar
dek expects the southern coastal salt marsh and Diegan coastal
percent of the mature height, form, and cover of the like habitat
requir
ibitats
in the vicinity of Mis project within the five-year monitoring period.
Estimd^d Cost
..^.^i^bst of the NAHI Project will be approximately $455,000. The total project cost
includes project planning, grading, removal of non-native plants, installation of irrigation, erosion
control, and native container plants, application of hydroseed, site maintenance, five years of
biological monitoring, and 10% contingency.
DUDEK
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North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
33
DRACT CONCCPTLAL HABITAT RCVCOCTATION PLAN
NORTH AGLA HCDIONDA SCWCR - WCSTCRN SCGMCNT
4.0 IMPLEMENTATION PLAN
This implementation plan describes the habitat restoration that is proposed. The plan proposes
to restore temporarily impacted habitats, landscape crib walls, replace barren soil^th southern
coastal salt marsh, intertidal mudflat and intertidal rocky beach at Site^^and^^ative ruderal
vegetation with Diegan coastal sage scrub at Site F. Project restor^^^^will be achieved
through plant materials salvage, site grading, irrigation, ^d^piantin^sflescribed below.
4.1 Rationale for Expecting Implemerilation Success
/
Cut Slopes
Revegetation of the cut slopes should be successful b^use th£.ciit slopes will be capped with
salvaged topsoil from the impact area and will b^^^gt to exi'sffig'coas^al sage scrub habitat
at relatively similar aspect and slope. Addi^^^^^^^iate n^^^pecies, that naturally
occur in areas with similar soils, aspect ar^^^e/My^^^ planting the slopes. A
temporary irrigation system will be ins^^d and^Siz^^^^K initial two to three years of
the project to aid the establishmenUlJhe coa^pTsage sc^^^cies on the slopes.
Crib Walls
lative d^^P%e scrub species should be successful because
taken into consideration when specifying plant species,
j^^in similar crib walls in the area, and that occur in the
ll^^cted for planting. Additionally, measures will be taken
Serial behind the crib wall is used. A temporary irrigation
^ed during the initial two to three years of the project to aid the
esta^hment of the coa^!^^ scrub species planted in the crib wall. The irrigation system will
bejRed to promote a^ropriate root system development that will lead to self-sustaining
ition.
Vegetati^^^^ crib
the <^esi^^^^^tob Wl
Native pl^^i^^^^^^t wer^
coastal sage scr^^^^^miisite,
to ensure^^^^^^^OT
system^Sl be installec
Rruction Corridor
Revegetation of the temporary construction corridor has a high probability of success because
existing topsoil will be left in place, when feasible, and pre-construction contours will be re-
established prior to planting. Native plant species that are present within the temporary
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North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
ProfesdomA Temms for ComfXtx ProjecU March 2004 34
DRACT CONCCPTLAL HABITAT RCVCGCTATION PLAN
NORTH AGLA HCDIONDA SCWCR - WCSTCRN SCGMCNT
construction corridor prior to project impacts will be used to revegetate the temporary
construction corridor. A temporary irrigation system will be installed and utilized during the
initial two to three years of the project to aid the establishment of the coastal sage scrub species
on the temporaiy construction corridor.
Withm the five-foot wide temporary area extending from the edge of tjie proposed seawall to the
lagoon, there is potential for vegetation community ty^^mversi^^^^^anges m wave
energy following introduction of the seawall. These affe^^iU be m^^^^^^^he five-^
post-revegetation maintenance and monitoring periog Any c^ges wil^^^^^^^d; if
necessary, the City will cooperate with wetlands resource.agencies to resolveSiiw concems.
Site A - Intertidal Wetlands Creation
The project design at Site A has a high probability
for the establishment of the target habitat
conditions will be created by grading the
habitat. This will create the necessa
intended habitats at Site A. In additip.
lydrolo
down to 12 inches below the desi
the finish elevation. By excavati
to the existi^ hydrologic
{Figure ^^^M^itiona^
reveget^^^^^m^that o
ol-success bec^^^^^ppropriate conditions
e creat^^^^e. The appropriate
of adjacent functioning
^r the establishment of the
be o^^^SLvated below the existing grade
fevatioafand appr^riate soils will be imported to create
Ite elevations, the site will be subjected
r^^ime ot tiS^M^]ae^lfiagoon estuary and functioning habitats
ize the same dominant plant species to
existiiigaS[acent southern coastal salt marsh habitat.
The site is, an
factors out^
success M^e mitigatTcp^'effprf
ue to^^^^^^ained as natural open space, limiting the disturbance
intXQll^Mhis ^m{^-g-, human disturbance) and increasing the likelihood of
Sit - Coastal Sage ^rub Creation
roject desigv^Site F also has a high probability of success because the appropriate
^^^^^^tablishment of Diegan coastal sage scrub habitat already occur or will be
cf^tt^^^^^-dsting non-native plants will be removed from the site and existing soils will
be^^^Sd to ensure a proper balance of soil nutrients and organic matter are present to
promote healthy establishment of Diegan coastal sage scrub plant species. An irrigation system
will be designed and installed to ensure that the installed plants and seed receive sufficient water
to encourage healthy growth and development during the first two to three years of the five-year
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DRArT CONCCPTIJAL HABITAT REVEGETATION PIAN
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maintenance and monitoring period. The mitigation area will be positioned such that natural
barriers to non-native weed encroachment into the site are maximized {Figure JB). The
mitigation area will also be designed to be adjacent to existing Diegan coastal sage scrub habitat
west of Site F. Dominant plant species planted at the site will be typical of those that are
dominant in nearby Diegan coastal sage scrub habitat.
Similar to Site A, this site is, and will continue to be, mair^^d as naturaix)pen space, limiting
the disturbance factors outside the control of this planincreasin£?tbSlikeImood of succj#^
of the mitigation effort.
4.2 Preliminary Schedule
The schedule provided below in Table 2 represents a tii^'lmc cst;^^^foi^ of the
NAHI project based upon the City's intended^iKtruction sm^mefe\ final schedule for
implementation will be prepared by the City ago^^^^g|ito the rcsmpre agencies for approval
prior to the start of the project. Updates t^,^^[s schP^m||^e pjyided to all parties involved
in project, as necessary.
TABLE LIMimY PROJECmCHEDULE
ation
act Areas
truction Corridor
November 2003
December 2004
January 2005
March 2005
Cut Slopes
;ess Road/Seawall Construction
of pre-construction contours In temp, impact areas)
April 2005
June 2005
nstallation on Crib Walls/Temp. Impact Areas July 2005
n of Installation Report August 2005
Install site fencing September 2005
Non-native vegetation removal and plant salvage September 2005
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DRAET CONCEPTUAL HABITAT REVEGETATION PIAN
NORTII AGLA HEDIONDA SEWER - WESTERN SEGMENT
TABLE 2 (Continued)
TASK DATE •
Grading and site preparation September|005
Plant Installation ^ f^ctobe^fe
Site Seeding /_ November 2005
120-day plant estabiisiiment period .' \ No\|2pp§^Jan 2006 j
Assessment of Revegetation Effort /"^ J?n^2006 .
Completion of Installation Letter Report \ / Febmary^OOe.,-.' T
Five-Year Revegetation Monitoring atid Reporting \ • .
First Annual monitoring report due ^ ^ December 2006
Remedial efforts, if necessary <C " --January 2007
Second Annual monitoring report due ,. . \ ' - Debmber 2007
Third Annual monitoring report due . \ -'December 2008
Fourth Annual monitoring report due / "^-'"-v December 2009
Fifth Annual monitoring report due / ^ December 2010
* Note: Actual dates are contingent upon res;)(fc§gency pemiit process./;
Restrictio
from M
nestlings,
the portions
restricted
quarter
a
^al are re^^^^^^ipty ^th the Migratory Bird Treaty Act
uall^^ms law generally prohibits the destruction of eggs,
tive nesting birds during this seasonal window. Because
tidal inundation, non-native plant removal will be
levels are at the lowest magnitude, usually around the
^sting birds are unlikely to occur in the habitat to be impacted,
the presence/absence of potentially-occurring species will be
:getation during project implementation if it occurs during the
nests will be identified and located by a qualified biologist. Plant
these areas until nesting activity has ceased. The proposed revegetation
icipated to exceed the 60 dBA noise threshold for harassment of coastal
^cher breeding activities. However, if noise levels during construction do exceed
the ^D'^BT^ noise threshold, noise attenuation strategies, such as the use of smaller, less noisy
equipment, changing the intensity and duration of work, the use of mufflers, or the use of a
sound wall, may be required.
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DRAfT CONCEPTLAL HABITAT REVEGETATION PLAN
NORTII AOLA HEDIONDA SEWER - WESTERN SEGMENT
The project implementation schedule above shall be in strict conformance with provisions listed
m the ACOE 404 permit, CDFG 1602 SAA, City of Carisbad Mitigation Monitoring and
Reporting Program and Environmental Impact Report, CDP, and California P\\VQCB 401 Water
Quality Certification.
4.3 General Outline of Habitat Creation Implernentation Strategy
The NAHI mitigation project includes restoration of th/temporangmpact
alignment (onsite mitigation) and creation of intertid^^^^^^nd Diegan
at Sites A and F (offsite mitigation) as mitigation for permaiient impacts
alignment. The general implementation strategy for th^^^^MS^escribed below.
4.3.1 Onsite Mitigation - Project Alignment?Area
Temporary impacts along the project align:
construction conditions. Pre-constructip#contou
areas where the soil surface has been^sturbed
shoreline protection wall on the ss^^rd sid
a cut slope on the landward sl^Mttgures
seaward side of the shorel^^S^tection
southern Q<^dl salt maxrf^^Sidal roc
to generally match pre-
as much as is practicable in
^ect alignment, there will be a
sew^^access road, and either a crib wall or
:t impacts should be minimal on the
fer, where temporary impacts do occur,
intertidal mudflat habitats will be restored
to resei
coastal sage^
A temporary if!
and on the.
item
l^ons as much as is feasible. On the landward side, Diegan
ited on disturbed areas, cut slopes and on the crib wall.
Td for the Diegan coastal sage scrub revegetation areas
)lants during the maintenance and monitoring period.
Site A - OffM^Krtidol Wetlands Mitigation
is currently a^pivegetated shallow basin surrounded by small berms on three sides
^ing the bas^^rom existing southern coastal salt marsh and intertidal mudflat. Grading
the mean high tide line back to the north edge of the basin to create the
ap^^^^^B^itions for full tidal inundation in the basin on a regular basis. Berms surround
the basin will be removed to allow unimpeded tidal inundation. The site will be over-excavated
to a depth of 12 inches in order to remove sandy, saline soils that are inappropriate for salt marsh
creation. Appropriate soils for salt marsh vegetation will be imported to the site to the design
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Onsite
CSS
Mitigotion
RECOMMENDED
BROW DITCH
Cribwall
CRIBWALL
Droinoge
Swole
PROPOSED DRILLED
PIER WALL
Q
\
SEWER PIPELINE-^
CALTRANS CABLE RAIL
(WHERE REOUIRED)
OJ
CARVED/HAND-SCULPTURED FACE
Sewer Access Rood
Solt
Morsh
MEAN HWL (5.5)
Intertidol
Rocky
Beoch
Intertidol
Mudflat
NOT TO SCALE
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Sewer Access Road Typical Section with Cribwall
FIGURE
8A
PROPOSED 2:1
SLOPE (MAX)
Onsite CSS
Mitigation
12" MIN. AGGREGATE
ROAD SECTION
2%
Drainage
Swole
CULVERT (WHERE SHOWN
ON PLAN)
PROPOSED DRILLED-
PIER WALL
Ox
SEWER PIPELINE^
Sewer Access Rood
CALTRANS CABLE RAIL
(WHERE REQUIRED)
CARVED/HAND-SCULPTURED FACE
MEAN HWL (5.5)
Intertidol
Salt Rocky Intertidol
Morsh Beoch Mudflat Ar
NOT TO SCALE
North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan
Sewer Access Road Typical Section with 2:1 Cut Slope & Culvert
FIGURE
8B
DRArT CONCCPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
elevation, which will be the same elevation as the adjacent existing southern coastal salt marsh
habitat. It is expected that intertidal mud flat will develop in a mosaic with southern coastal salt
marsh onsite in shallow depressions and in micro-channels where the duration of tidal inundation
is greater. A
Intertidal rocky beach will be created at the southern tip of^the berna€Kat^ends toward the
open water of Agua Hedionda Lagoon {Figure 7B). After t^^erm is fmJ^H^ck will be placed
on the shore of Agua Hedionda Lagoon to create the condjions for th|^'^M§^en^of intert^l
rocky beach. The imported rock will be salvaged froi^he imp^^rea Si^^^^^^^all
boulders and cobble. If there is not enough salvagedl^^^^bble from^^^^SjSrea to
adequately cover the intertidal rocky beach creation ar^ftditaonal rock will be &^drted from
a source approved by the City and the project biologisty-
.^^^ ^^^^^^^^^^
4.3.3 Site F - Offsite Diegan Coastal Sage Scrub Mitigation
Site F is currently at an appropriate elevation f-'.VxrcaUng Dieg-in/coa-Lil sage scrub habitat;
therefore, no grading will be required. Soij^mpleswilll^^^^^^nd tested to ensure that the
soils onsite are not in need of remedmt^ prior^mhe ins^^^^m of plant materials. If soils are
deficient, soil amendments may ^^Smm^ed. The^tial implementation strategy will be
to remove existing non-native ^^fror^^ prop^^Diegan coastal sage scrub mitigation
area, install an irrigation sys^^d perfo^^^^^^ grow and kill cycle by irrigating the area
hen coi^^^^^^ weeds. The grow and kill cycle will help
he soil, and thereby, improve conditions for native seed
ce long-term maintenance at the site.
until wee^^^ germ
to redu^^&e?we^ see
germinatio^^^Efii
Following il^P^^^i^^M^^tion cl^ng and the grow and kill cycle(s), container plants and seed
will be^^^ed in ac^^^^^^th Section 4-4 below. The plant species composition for Site F
is de^^d to be consis^^^^^plant species composition in nearby Diegan coastal sage scrub
ha^pt and to be appiSriSe for coastal California gnatcatcher use and/or occupation. The
is designed t^e dominated by California sage, black sage, California encelia, and
®rnia buckwh(
Materials and Installation Requirements
Implementation of this wetland and upland planting plan must be coordinated among the
Restoration Contractor, the City, the Project Biologist, and the nursery providing the plant
materials under the contract growing agreement. The contracting nursery and seed supplier shall
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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be given the maximum amount of lead time possible to allow for successful seed collection,
species propagation and preparation of plant materials for transport to the project site. Plant
materials for the planting plan will include container stock and seed of native coastal salt marsh
and Diegan coastal sage scrub plants as indicated m the plant palettes provided bg^w in Tables
3-5, /
TABLE 3: RECOMMEWDED SPECIES FOR SOUTHERN COA^/l^ALT MARSH PLANT PALEHE
CRATION AREA AND TEMPORARYWACT AREA'>
/
* These species may not be appropriate for the onsite southern coastal salt marsh along the seawall, depending upon the finish
elevation and frequency and duration of tidal inundation in that location.
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DRArT CONCEPTLAL HABITAT REVCOCTATION PIAN
NORTII AGUA IIEDIONDA SCWCR - WCSTCRN SCOMENT
TABLE 4: RECOMMENDED SPECIES FOR DIEGAN COASTAL SAGE SCRUB PLANT PALETTE
CREATION AREA AND TEMPORARY IMPACT AREA
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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TABLE 5: RECOMMENDED SPECIES FOR DIEGAN COASTAL SAGE SCRUB PLANT
PALETTE CRIB WALL LANDSCAPING
Botanical Name Common Name Size Ave. Spacing* Total Quantity^
\Diegan coastal sage scrub container { ilants (0.14 acre) -1
Artemisia californica California sagebrush 4-iji6h pot • ^-^-Sfeef... 160 ,
Bacctiaris pilularis coyote brush ^cTTpot /2-5,feet: -^ 80 /
Encelia californica Califomia sunflower ^Inch pot /.--2-5fcet,^ 'r.
Eriogonum fasciculatum Califomia buckwheat i4:|ch pot ^ 2-5 feet \
Isocoma menziesii goldenbush \4-inchpot' ' 2 - 5 feet ^
Isomeris arborea bladderpod ^chpot..: 2 - 5 feet 40
Lycium californicum desert thorn ^ffnchjwtr'--2 - 5 feet 40
Mimulus aurantiacus sticky monkeyflower <'4-inch p'bt^v: -a^steet 40
Salvia mellifera black sage ,..^,4-inch pot N,; ^::-T2r51eet 80
t'tiy 'sur.*i e' • ; -^^^^^^^^^^^^^^^^^^^
Note: Container plants will not be planted on the crib walljffiire it is shorter than approxiinatfy three feet. Instead, container plants
of the cribpall onl^^
the crib v^u and will be
will be planted at the base of the crib wall and on the
* Container plants will be planted in every othej-ce
five feet apart horizontally,
t Total quantity of container plants is an ^^te whict
height of six feet^nd 292 linear feet^h ffiverage hei|
that there wiySplantable surfe(^^^&p and at tf
also be plaraS) ttiere^;!?:-..
approximately two feet apart vertically and
i^mes thatjhffitwo crib walls will be 270 linear feet with an average
Additionally, in figuring the total quantity, it is assumed
ie crib wall when it is complete, and that container plants will
A contrac I rio^jiig^^^^^^nt v^^^ suitable nursery shall be initiated prior to implementing
the plan^^plan, to^^^^^^appropriate plant materials are reserved and to minimize costs
for p^^gation of the s^^^^muded in the plan. Plant material may be purchased from Tree
of y^nursery in San Juffi ^pistrano, El Native Nursery in Azusa, and Las Pilitas in Escondido.
approved sourc^por native plant materials may be available, based upon approval by the
)gist. The contracted nursery shall provide plants and seeds that are of
psunty origin.
StaiTS^^S^^anting procedures will be employed for installing most container stock. Holes
approximately twice the size of the rootball of the plant will be dug using a post hole digger or
power auger. If dry soil conditions exist at the time of plant installation, holes will be filled with
water and allowed to drain immediately prior to planting. Backfill soil will contain no
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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amendments or fertilizers unless the results of the soil tests indicate that soils are deficient and
are in need of amendments. Wire cages shall be installed around each of the coastal sage scrub
container plants to prevent herbivory while plants are becoming established. Following
installation, each plant shall be fully irrigated to the depth of the rootball to v^^er-settle the
backfill mix and provide moisture to the plant. ^^.^ '
Seed shall be of coastal San Diego County origin and may^d|;qbtaind||omto seed sources
including S&S Seeds m Carpenteria, Anderson Seed Cq^Escond^o^^|^^OTative some
approved by the City and the Project Biologist. Seed shgbe hydr^e^ded on'^^^^^^^^gan
coastal sage scrub creation area and on any onsite uplaii% a_rcas#\ransitionS^|^g^
during installation.
4.5 Irrigation Plan <
Site A
The primary goal of the NAHI Projec^p^ceptt^pu^^^^^n at Site A is to establish an
extension of the functional tidal we^^s syst^^hat is^^^Ie of maintaining and supporting
itself. Excavation of existing s^^pwn ^pppropriW elevations, will allow regular tidal
inundation at the site, comparaj^^the a^Sent ex^mg coastal salt marsh habitat. Thus, no
irrigation system is plann^c^ite A. ^^^^^necessary, the container plants will be
itH'avWater tj irrigated
Erosion com
'diately' installation.
isitiom
and existing uj
vegetative^^Si
for this^^ either; ho^
critic^Wo encourage init
a v^pr truck may be n
nDt.6i\'ui
tween the proposed southern coastal salt marsh habitat
lan coast^gge scrub habitat is intended to establish an appropriate
itive c^^al salt marsh and upland species. No irrigation is planned
feDpriate timing of planting to correspond with seasonal rains is
^^lishment of seeded plant species. Supplemental watering with
lired during the initial plant establishment phase if sufficient rains do
^m^^^Construction Corridor, Cut Slopes and Crib Walls
Irrigation systems will be installed to ensure that native container plants and seed installed at the
offsite Diegan coastal sage scrub site and the onsite temporary construction corridor, cut slopes,
and crib walls become established. The irrigation systems will be temporary and will be used
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DRAFT CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
only until the plants are established such that they can survive on their own from seasonal
rainfall.
The irrigation systems will be installed entirely above ground, so that all irriga^efp equipment
may be removed once the systems are decommissioned. The irrigationj^^^stemsj^^lll utilize City
water mains located in nearby streets and will be installed with a temp^^^ater meter (to be
installed by the City). All onsite irrigation will consist of PVGpipe srateaj'^made at 10 feet on^;
center and at all corners, providing 100 percent coveragpsing spr^€eaq^. Check valve^jdl
be installed to eliminate low-head drainage. Irrigation ^[ipone^^uch a^lvcs and ^priiifiler
heads, may be salvaged for re-use elsewhere at the end ^^^^^mishment per^^^Mrngation
will be installed by the Contractor. Irrigation shall st^ at the earliest possible^^e without
risking significant loss of plantings. It is expected that^iie^Kigation system will be abandoned
at the end of year 2 or year 3 of the five-year mainterfence^^^^^^ing period. Watering
onsite will gradually be decreased prior to the i^^^^s^^"^^^^^^^"^^^^^^^^^
the plants to become acclimated to the site'^&ural^ h^drolog)'. AH^^gation material shall be
removed from the site once irrigation is t^^^ate^;./':;:» •-•:>-. .
4.6 Required Activitie^^ring Project Implementation
4.6.1 Construction Mpngoring by^^roject Eulogist
^^^^^^ ^^^^^
ThePr
duration ^f^Ssl^et
as needed.
Project Biolo^
conditio^^id the
will ^mocumented in
^ted, as needed,
to^rip work in areas
(S^r of damage in
will^^e regular site obsfivations of revegetation activities throughout the
^^^^^^^iologist will visit habitat creation and revegetation areas
ion re^^^^^ding, irrigation installation and plant installation. The
lew ^^ffies for conformance to this plan, environmental permit
of contract plans and specifications. Each site observation visit
•B^^ation report. Photo-documentation of site conditions will be
Dject Biologist, via the construction manager, will have authority
fere biological resources, not permitted to be impacted, are in imminent
'construction activities.
•SitSPreparation
If construction of the road and wall begins outside of the breeding season (February 15 - August
30), habitat within the temporary construction corridor will only be cleared on an as-needed basis.
However, if construction of the road and wall begins during the breeding season, all habitat on
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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the landward side of the temporary construction corridor {i.e., coastal sage scrubj will have to be
cleared prior to construction because no clearing is allowed during the breeding season. Pre-
construction clearing would be limited to above ground vegetation removal with little or no root
disturbance. Breeding season clearing of coastal salt marsh would be allowed wi^^.pre-clearmg
nesting bird survey. In total, habitat removal along the project alignm|nt ar^ffiay include up
to 1 04 acre of coastal sage scrub, 0.20 acre of coastal salt marsh, 0.15 acre uf^intertidal mudflat
and 0.01 acre of intertidal rocky beach. ^P'^
> \ X Prior to beginning construction on the habitat creatio^tes, allnt)n-nativc^^x^^^^ br infasWe
vegetation must be removed and disposed of offsite at a^^ep^^e landfill facilit^^^^ptionally,
at Site F, a grow and kill cycle shall be completed after ^^^k^ has been instiled to reduce
the weed seed bank onsite. Site access for mechanized ^^^^^^^be required for removal of
the majority of the non-native vegetation via an exi^g u^^^^^Mrt access road. When
working in the proposed restoration areas, a corr^^^^er-tra^^^^pid/or track excavator
under 10,000 pounds operating weight sh^^^^^^to ens^^^t disturbance to site
substrates is minimized. Any other equipped tracked
equipment {e.g., no tires) to prevent soil^Spactig^n^^^^ffiiizing the pounds per square
foot of pressure exerted by the machine
At Site A, there is a very limited
onsite will ^salvaged to
to be salv^^X)nsite
plant
An attempt"^^^^^^de to s
berms that bord^^^fe: how^
scrub
^unt of ^^ing na^^Dlant cover. Existing native vegetation
:est ext^^^^^^^. Native coastal salt marsh plant species
leweed,^^^^^ and alkali heath. Other coastal salt marsh
Biologist, will be salvaged and reused onsite, if feasible,
lative coastal sage scrub shrubs growing on the existing
to the difficulty of transplanting mature coastal sage
^thcm rn^ be impractical.
ffiiited amount of existing native plant cover. Only a few native
salvaging them will not be practical.
the impact area will be identified by the Project Biologist prior to
to be salvaged from the impact area include selected - native plants (as
icie?51i^PF^^r^proiect biologist) from southern coastal salt marsh and Diegan coastal sage scrub
habitats, and boulders and cobble from the impacted areas of intertidal rocky beach. In areas
where grading is required, the top six inches of soil will be salvaged prior to construction and
spread back over the top of the revegetation areas after construction is complete. Additionally,
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DRAET CONCEPTLAL HABITAT REVEGETATION PIAN
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native plant material, from plants not salvaged, will be mulched and spread around the base of
container plants in the revegetation areas.
Methods of salvage will be coordinated with the contractor but will likely include removal of
plant materials with shovels and removal of rock and soil with mechan^ed maemnery. Salvaged
plant materials will likely include southern coastal salt marsh sp^^^^^^as salt grass and
pickleweed and coastal sage scrub species such as Califormpage brta^^^^pst prickly-pe^.
All native plants for salvage will be kept onsite in a loca^n agreed^^^S^^^^^ct Bi^^'t
and the Construction Manager, to prevent further dam^durin^evegetaflqn reiiioval dncl?ite
preparation activities. All native plants removed from. Site A aiplH the impact ^^^^^ed for
transplantation, shall be kept moist until they arc plaiSat meir receptor site.
4.6.3 Soil Export, Import and Grading
Site A
Soil export, import and grading will be n^ssar>' at-fite Alocreate-the appropriate elevation, soil
and hydrology for the intended hab^^ypes. ^^ing be^^Et surround Site A and the berm
that extends from the basin tow^^P lago^p^ill be g^ed down to the appropriate levels for
southern coastal salt marsh hal^ff^ Soils^fthin the»sin will be over-excavated at least 12
ine soilsj
identified by the City or the Restoration Contractor. The
s laboratory to ensure that it is appropriate for the
nsure that the soil is free of all contaminants and weed
y the Restoration Ecologist that the soil is appropriate for
and spread out across the over-excavated area to the design
inches to re^ve sandy, h
A soil
soil will firs
proposed
seed
Site A
eleV:
adjacent coastal salt marsh in this area, it is expected that a mosaic of
marsMna intertidal mud flat will develop at Site A. However, to increase the
:h habitat types develop at the site, approximately 0.16 acre of the site will be
itly lower elevation than the elevation for southern coastal salt marsh.
Rock from the permanently-impacted areas of intertidal rocky beach will be salvaged and
transported to the intertidal rocky beach creation site (Site A). If there is not enough salvaged
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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rock and cobble from the impact area to adequately cover the intertidal rocky beach creation area,
additional rock will be imported from a source approved by the City and the project biologist.
SiteF
No soil export, soil import or grading will be required at SiteE. However, clearing and grubbing
will be required to remove the existing non-native vegetation fioni'the site.-
4.6.4 Erosion Control
Both Sites A and F are relatively flat, with very little elevation change. Only limited erosion
control will be necessaiy to preserve final graded ele\^^ions^^^^cluding the slope at the
transition between the proposed southern coastal salt^narsh iSfiitat and i visting Diegan coastal
sage scrub habitat at Site A. To protect this slo^^^^eet erosicm; nurse crop species such as
arroyo lupine {Lupinus succulentus) and "^ot-^^^^^^to^^r^g^^^) that germinate and
quickly create vegetative cover will be i^^^^^ate^^^^^^^^pnal seed mix for that area.
Additional erosion control measures in^p form^^M^^^^^ilized during winter months
to ensure the project is acceptable ^^Regio^|l'Water ^Sity Control Board as stipulated in
the 401 water quality certificatio^^^it.
{e.g. straw wattles), straw erosidWontrol rfSakets
at key locations where watOTtlnott is ext
4.6.5 NCoris^ction
includ®! installation of silt fencing, fiber rolls
^ndbags, will be installed, as necessary,
hcentrate.
Temporary^^^^^^^^cn fe^SMl be installed to protect environmentally sensitive areas
that are -S^^nt t^^^^^^ources along the impact area and surrounding the proposed
mitig^n areas. Th^^^^^locations will be approved by the Project Biologist prior to
ins^ption and shall beffisMed prior to the beginning of vegetation clearing and grading. The
fdffi will consist of or^e snow fence attached to metal T-posts. All fencing materials must be
lum of foutJ^ high and remain in-place construction is complete,.
Signage that identifies the project sites as habitat restoration areas will be placed on the
perimeters of the sites,- and will include a phone number for additional information, directing
questions to appropriate City personnel. Signage will remain in-place until the end of the five-
year monitoring period.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
4.6.7 Onsite Construction Activity Restrictions
During construction of the NAHI Project mitigation sites, the following guidelines shall be
implemented onsite.
• No coastal sage scrub vegetation shall be cleared during the coastal Califoi ma gnatcatcher
breeding season. Construction during the coastalXMifornia g^^atcher bi ccdini; season
or the breeding season of any other sensitive bir^fshall only.^a ir after comnirt \jnma
nesting bird survey. j y"^
Pets or domesticated animals are not allowcLi on the sifc X.^^-
No machinery fluids will be added or changed on the re^^tion site or near the stream
channel; refueling of machinery will occur withln^'desigrfa^^eas and only over areas
with a non-permeable membrane installed. "
Concrete truck wash-out areas shall be designate<J,and imple^^ft in accordance with
CalTrans standards. .^^^
Only machinery necessary to P^^^^^ ^^"^^^^^^^^^^^^ allowed on site, and each
machine shall be removed imn^mtely aftei' its^^^^^plete.
All machinery used onsite e lowJ^ST equipp^TOcked equipment {e.g., no tires) to
prevent soil compaction.^
"^ion sit^&llb^^Knpact rubber-track loader and/or track
iunds of^^^^^^ht.
:kpili^^^^ will occur in or near wetland areas on site,
^will be limited to the existing unvegetated access path.
Equipment used in the
excatfator under 1
^^ig of
iructioii a -ces
MAINtENANCE PL^^
the project site as part of this plan will be subject to the
mnce plan. The City will be responsible for at least five years of
ring of all habitat revegetation areas, in compliance with this conceptual
-terrn^pLntenance and management responsibility for the restoration areas along
rest with City of Carisbad Public Works in coordination with private
Planning Department, CDFG, CCC, Agua Hedionda Lagoon Foundation, and
offsite habitat creation areas are under CDFG ownership and they will continue
ongoing maintenance and management of the site.
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DRAFT CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
The purpose of the maintenance plan is to provide guidelines for maintenance, erosion control,
and biological monitoring of the restoration and buffer areas. Maintenance activities will occur
in consultation with the Project Biologist. Because the goal of the restoration plan is to establish
a natural system that can support itself with little or no maintenance, the primar^^^ffort of the
maintenance plan is concentrated in the first few seasons of plant^grov^hfollowing the
enhancement effort, when weeds can easily out compete native/plants»?The intensity of
maintenance activity is expected to ease each year as tl^gative plSr^^^^^ become mc^e
established and local competition from non-native pM'Ffor res^el^^^^^ject ^e;is
minimized through direct removal of non-natives fromffie site. L^term rnli|itcnancc Juricerns
for the site will include non-native, exotic, and invasiye:planL-^ecies that \^^^^^^to be
carried onto the site through tidal action and wind. H^^^^^risk of large-sc^^e-invasion
of non-native plants onto the site can be adequatcK' mpii^edtiuring the first maintenance
period by adhering to the specific maintenanc(^ an^l management guidelines that are presented
below.
5.1 Maintenance Activities /
A) Temporary impact restotaHbn are
establishment and plant«tlrviva
summer months. IrmgStion m
above normal
^^^tio
^^^myolu
irn^^^^^ition
N^^^^^m^em:
^^TOE^^^^^^date
with the pr^S^^^fcist
will be irrigated to promote seed
lier parts of the year, primarily the
inter months to simulate a normal or
^^Sation is lacking in volume or appropriate
continue for a maximum of three years,
radually reduced over time to acclimate plants to a non-
plete cessation of irrigation. Irrigation from June to
allow plants to experience normal drought cycles and
growth. The irrigation schedule shall be coordinated
r;.^ P)) Trash and i^ganic debris washed or blown onto the site will be removed regularly
' ip- in accordat^ with Section 5-2.2 below.
^^•^^Tf^'ii^es will not be fertilized during the maintenance period unless so directed by the
'"'^'^''^^^Q^^ Biologist and approved by the City.
D) Non-native species may invade the restoration site and become a problem before or
during the establishment of native plant associations. Weedy, invasive, and non-
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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native species (listed below in Section 5-2.1) will be controlled as soon as they begin to
appear onsite. While manual control of non-native species is the preferred method,
herbicide treatments may be required to adequately control some invasive species.
Herbicide treatments shall only be performed with approval from tl^^^City, and as
directed by the Project Biologist.
E) No service vehicles will be allowed in any habitatjarea at^any time.
F) Remedial container planting and/or supplemental h^^seeding^ay be r.ocessary
following each monitoring stage, as directed by thcrfoject Biologist^ .
G) Implementation of erosion control mea^jre^^^^^onducted for a minimum
of three years during the monitoring perim Er^^^^S^ features may include
sand bags, silt-fencing, installation of geojtmile fabr^^^^M^s {i.e., straw wattles)
H)
or other measures as determine
Contractor.
No machinery-dependen^namten
any sensitive birds withou^rst
a qualified avian biolo
I^the event
^^dinate
rescnt)e and
'roject Biologist or the
uring the breeding seasons of
gh a nesting bird survey by
goals are not achieved, the City shall
'to identify the project's success and shall
remedial measures to address the project shortcomings.
5.2 HamiffiPMaintena^^Guidelines
control will be n^ssary during the clear and grub period before grading begins, after initial
lation of plant^ffi seed, and throughout the five-year maintenance period. Ongoing weed
ictivities^pl occur within coastal salt marsh and coastal sage scrub habitat areas
ig-term maintenance period. All weed species will be removed from Sites A
^getation installation activities. All debris and slash generated from weed removal
activities will be disposed of offsite in a legally acceptable manner.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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Weed control measures will include the following: (1) hand removal, (2) cutting with weed
whip machines, and (3) herbicide application. Hand removal of weeds is the most desirable
method of control and will be used around individual plant installations. If hand removal is
ineffective for some difficult to control plant species, spot treatment with herbicid^jA^ill be done.
Any herbicide treatment must be applied by a licensed pest control applitator in^ccordance with
all applicable laws, regulations, safety precautions, and labeLdirections.
Weed control shall occur bi-weekly during January tl)K>ugh Ma^, and mgnt^^uring |^fie
through December of the first year of the long-term mmntena^ppkiod^l^^^^^s^^^^
weed control shall occur on a monthly basis. WeeM^^^^all be contrSl^^^rto the
formation of seed heads. More frequent weeding will^e performed as recommended by the
Project Biologist to keep any weeds establishing on th^^oject site at manageable levels.
The following weed species, which may occur^^^^Ml be cbntrolied before seed-set: black
mustard, African brass buttons {Cottda ^^^^^^^^^F^ fenni^Italian ryegrass {Lolium
multiflorum), perennial ryegrass {Lolium /^^^^^^h^^^^^^^^^rv//7ora), clover {Melilotus
spp.), tree tobacco {Nicotiana glauca), bnstly ox^pn^^^^^piioides), castor-bean {Ricinus
communis), dock {Rumex sp.), commJi sow-^stle {So^tms%leraceus), cocklebur {Xanthium
strumarium), salt cedar (r^w^r/.>c. s^fHotte
laetum), Brazilian pepper {Schir^Mnolle),
dactylon) an^nnual rabbi^^c^ grass (
appear
Project
5.2.2 Clearing and Trashxetnoval
areas
brotus edulis), myoporum {Myoporum
fundo donax), Bermuda grass {Cynodon
'speliensis). Additional weed species that
to this list if deemed necessary by the
clearing of ^^^a^fe vegetation will not be allowed within the restoration area,
as directed by th^^^t Biologist. Trash will be removed from the restoration areas by
a regular basis;^eaning no less than one-month intervals for the first year and quarterly
fter. Trash co^ts of all man-made materials, equipment, or debris dumped, thrown,
blown, aiffleft within the restoration areas.
Ion
5.. Erosion Control and Repair
Areas that exhibit a tendency to erode will be stabilized by revegetation, straw waddles, re-
compaction, or other means as prescribed by the Project Biologist and approved by the City.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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5.3 Maintenance Schedule
Maintenance activities will be conducted concurrent with the installation of the container plant
materials on the project site, and will continue throughout the initial 120-day plari^^tablishment
period, and through the scheduled five-year maintenance and monitoring period.
5.3.1 120-Day Plant Establishment Period
The installation contractor will be responsible for m£mtenanco^f the mitigation areas .for a
minimum period of 120 days. Maintenance visit^^ai^^^onducted t\\a^' per-month
throughout the 120-day establishment period. At the e^^^^g^riod, the City, tKe contractor
and the Biologist will review the mitigation areas to^^e^^^^^completion of the plant
establishment period. Any problems detected durii^his ^^^^^^e completed prior to
acceptance of the mitigation areas. The conti actors'hali.be respo
of all container plants at the end of this period
5.3.2 Five-Year Maintenance Period
'100 percent survival
Contractor maintenance activit^^n the
through May, and monthly di^^June
maintenan^^eriod. Aft^^kgst year.
The Proied^mlis^ist ^i^J^^^^^^P^^^i^
momtoriWlp'e'tldclj Re^^^^fflktions for maintenance efforts will be based upon site
observations^^ will include i^S^^Jrag irrigation, weed control, and trash and debris removal.
quar
bnducted bi-weekly during January
mber of the first year of the long-term
activities shall occur on a monthly basis,
terly basis for the duration of the five-year
'Summor^f es^lishromt following installation, all plants on the project site shall
viabilit)^^^^^®tdred percent survival of container plants is required during the
percen^^^^fter, of the five-year maintenance and monitoring period. If the
contaii^r plants exceed the survival requirements, they wiU be removed and
size material as was planted originally. Replacement planting wUl be
native plant establishment on the project site.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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6.0 MONITORING PLAN
6.1 Performance Criteria
The habitat types to be created at the project site include southern co^a| s^Snarsh, intertidal
mudflat, intertidal rocky beach and Diegan coastal sage^|yb. P^^^b^ criteria vary for
individual habitat types and have been established based U|pifexpec^g||^^ developm^t
withm a properly functioning native habitat. In additio^impacts t^ublf^^^^^ cribj|^alls
require landscaping to mimic natural aesthetics. Since the ciili^v^ffll revegS^^^^^pf not
intended to establish habitat, performance criteria tor'this component is F^|^|Dni visual
performance/success.
Performance criteria will be utilized to assess the annual progress of tl^^igation areas, and are
regarded as interim project objectives designed ^^^^^^^ ^^^^^^^^^^^^^^'^^^ Section 3.0
{Tables 6, Z and 8). Fulfillment of these criteriaHmU^ th^^ project is progressing
toward the intended habitat type and hjb^t ^^^^^^^^^^F^^^ long-term goals of
the plan. If the restoration efforts failJ'^eet th^er^^^^^andards in any one year, the
Project Biologist will recommend/|ffidial ^^ns to ^^^lemented that are intended to
enhance the vegetation to a leve^^^forr^^ce with^ original standards.
No perforn^^e criteria a
coastal 5^^^^^ habit
primary^^^^^^^ con
is important^^^^ptie an ac
be no less th^^^^^gt^on-nS
there shaU^^^oiiTvaSM
native*d^er exceeds thi
[flished fo^^^^^itional area between the proposed southern
"e^sting^S^^oastal sage scrub habitat at Site A because the
^life habitat. However, adequate native vegetation cover
el of erosion control. Native vegetation cover should
egetation cover should not exceed 10 percent cover, and
rc^^tiveTpecies at the end of the five-year monitoring period. If non-
^fflte anytime during the monitoring period, then additional native
seegl^ould be introducMl^hose areas lacking native cover.
leiffsite coastal^^e scrub creation area will have additional performance criteria to
Im^strate suiM^y for coastal California gnatcatchers, if the City is unable to preserve
"^^^^nS^mied habitat as part of the mitigation for permanent impacts of the project.
M^tkmng tor gnatcatcher behavior will begin two years following plant installation and
continue annually during the spring or summer until use of the created habitat is observed. "Use"
is defined by observation of male or female gnatcatcher activity within the created habitat area
over a minimum of one total hour during two survey days.
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TABLE 6: HABITAT PERFORMAWCE CRITERIA
FOR SOUTHERW COASTAL SALT MARSH
(creation and restoration areas)
Year
Percent Survival
Southern Coastal Salt Marh
Percent Native Cover
Maximum Percent Non-
Native Cover
1 100% 20% 10%
2 90% 40% 10%
3 90% 60% 5%
4 90% 80% 5%
5 90% 90% 5%
Percent Sun/ival = total percentage survival of all co^^^^^
Percent Cover = total percent cover of all native plant species, including planted and naturally recruited. • • • • •' .. •
Note tiiat Hi years one and two, perforniance criteria vnll be derived jrom qualitative data ^ from quarterly monitoring visits
to the mitigation s^^^
/
/
TABL^pABITAWRFORMAI^iE CRITERIA
^miEGAN^^TAL^#SCRUB
(creatioj^^Mttl^^areas)
Year
Diegan Coastal Sage Scrub • Creation and Restoration Areas
Percent Survival Percent Native Cover
Maximum Percent Non-
Native Cover
1 100% 15% 10%
2 90% 40% 10%
3 90% 70% 5%
4 90% 80% 5%
5 90% 90% 5%
^^^^^^^^^^^^^^^^^^^^^^(^^"we^omj^
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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TABLE 8: VISUAL PERFORMANCE CRITERIA
FOR DIEGAN COASTAL SAGE SCRUB
(crib walls)
DIegan Coastal Sage Scrub - Crib Walls
Maximum Percent Non-Native Cover
Percent Native Cover
1 10% 5%
2 20% 5%
3 30% 0%
4 40% 0%
5 50% 0%
Percent Cover = total percent cover of all native'plant species, including plahted arid naturally recruited.^ For the crib walls, percent.•
naUve cover will be visually estimated by the project biologist.:;;:.. • '[K'^'-:/ '> 'SC Xx.-"' •
6.2 Habitat Monitoring /
/
Site A - Intertidal Wetlands Cti^tipn
;idal muifflat aaddntertidal rocky beach habitat areas will be Habitat monitoring in the
limited t^^^tive ^s^^^^^o ^^^^^ habitats are developing as
"^^^^'^^^^^^^^^ ^^^^^^^^^ document the presence of visible functions of the habitats.
Quality as^^^^^^icato^^^^^^tidal mudflat will be based on the presence of shrinking
•^epreseOI^^WPtracked surface when dry, the accumulation of fine soil
^s, an^^ evidence of invertebrate animals on or within the mud,
:01^^^x>ther anecdotal evidence. In the intertidal rocky beach habitat,
Ssed on the development of visible functions such as the presence
tMiment sites for primary producers, roosting sites for birds, presence
ertebrate anima^pi rocks, under rocks, and in sediments under and surrounding rocks. A
fative assessraig^Df some of the intended functions of the intertidal rocky beach habitat
and swelling o^^^^S
particles, su^^^^^S
such as^^mow casing
qual^ffive assessments
of iSnanent and stabl
Q
^^^^onsidering the inaccessibility of the habitat to the Biologist. If this is the
^^^^^ habitat could still be assessed without access, and may be the
only reasonable parameter to monitor.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
Habitat monitoring m the southern coastal salt marsh areas will include both qualitative and
quantitative methods. Qualitative monitoring will be conducted to determine initial survival
rates of container plants, plant species diversity and visual evidence of use of the revegetated area
by wildlife species. Percent cover of native and non-native species planted on the j^oject site will
also be estimated by visual estimates during the first two years after project installation.
Quantitative monitoring will be conducted during years threethroifn;h five to determine native
and non-native plant species cover onsite. The following meffiodology for measurmg
jtab^shed
series
of 10 one-meter square quadrats will be placed over th^^^^pn in alternatingTashion every
other meter along the transect line. Percent cover of all^^^^^^^esent and bare ground will
be estimated to the nearest five percent cover (species® the one to five percent cover range will
be estimated to the nearest one percent cover). Tmns^^will be^^^Sotumented at the time
quantitative cover will be used: Three permanent 20-n^fer long^Aect liri^
randomly within the southern coastal salt marsh habitat. Alo^pach of the trahl^
imary)
[so be esSHished to document the
[information^thered and representative
of data collection. Permanent photo loca|
development of the habitat over time. A
photos will be presented in annual r^poifs.
Ifthe habitat develops sufficientl\^mtet th^stablishe^ve-year success criteria before the end
of the five-year maintenance moni^&ig P^^M quantitative measurements will be
discontinue^to avoid u^^^^ry traii^^^^^^ southern coastal salt marsh habitat.
Qualitat^^^^toring^^^^^ue, ho^^^^^ml the five-year maintenance and monitoring
period i^^^^^^^ ^^^^^^^c^,'!^^^^ accepted and signed-off by the regulatory agencies.
Site F - CoastallSae^fetub Creiti'oii
Habit^^ionitoring in^^^-^^^an coastal sage scrub habitat will include qualitative and
quamtative assessmen^^^Mitative monitoring will be conducted by a qualified biologist (as
by the City oOTadsbad and the resource agencies) and consist of a general site walkover
laracterization QTOe revegetation planting. General observations, such as health of planted
catering, and drought stress will be noted. Revegetation plantings will be
ly estimate percentage of cover, species mortality, species composition, seedling
recmtmeprf^d soil, weed and pest problems. Maintenance needs will be recorded and
submitted to the installation/maintenance contractor and the City for appropriate action
subsequent to each survey.
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
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To augment qualitative data collection, more precise data will be collected and analyzed by a
qualified biologist to document and evaluate the progress of the revegetation program toward
meeting habitat goals. At year three, or before, three permanent transect sampling locations will
be established at appropriate representative locations withm the revegetation area<|Quantitative
transect data will be collected along each of these transects in years threjlhrough'five. Transects
will be 25 meters long, and sampling will utilize the pomt-in^ercept niethodat 0.5 meter intervals
along each transect. Consistent sampling techniques will'^fee^used tlirpughout the monitoring
icu&entation stations process to ensure accuracy in comparative analysis. Pemanent ph^^^ ^
will be established along each transect to record the Kg^^ss o^e^'reveget^^^^gra^ind
plant establishment over the five-year monitoring pe^od. X'cgetation sampli^^gps^ill be
analyzed and included in annual monitoring reports, c^^^m^ow.
California gnatcatcher presence/absence surveys shal^e conducted by a qualified, permitted
biologist annually beginning two years after p^^^^^ationNSurveys shall be conducted in
accordance with the USFWS currently ^^cep^fe^^^^^ol for U^p^ecies, with a maximum
of three surveys per year. Surveys will be^^^te^^^^^^^#-year monitoring period or
until gnatcatcher use of the Diegan coas® sage scrub Mp^^^^ion site is observed.
/ /
Sewer Alignment Restoration^ea
Qualitative
beach,
monitor
pnitoringwiuAi
igan^ii
s will
consist of a ^^Siite^walkd
health of planteast^e'ciesisigns o
be exami
seedlinrfecruitment
only foim of m^^Mng for intertidal mudflat, intertidal rocky
e scrub^^t^on planted on the crib walls. Qualitative
;o those methods proposed for the creation areas and shall
acterization of the revegetation planting to determine
^patering, and drought stress. Revegetation plantings will
ate p^entage of cover, species mortality, species composition,
:ed and pest problems. Maintenance needs will be recorded and
maintenance contractor and the City for appropriate action
y.^All vegetation sampling results will be analyzed and included in
ts, discussed below.
Rve monitoring will be conducted for the habitats along the seaward side of
^potential habitat type conversion due to the construction of the seawall and
consequent changes to the wave energy dissipation. If type conversion is observed along the
seawall, then the City will need to consult with the resource agencies to determine if
amendments to the permits and appropriate mitigation are required.
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DRAET CONCEPTLAL HABITAT REVEGETATION PIAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
Both qualitative and quantitative monitoring will be conducted for Diegan coastal sage scrub
vegetation planted on the cut slopes and along the temporary construction corridor, and southern
coastal salt marsh vegetation planted along the temporary construction corridor.
Revegetated Diegan coastal sage scrub areas along the temporaiy con^tructioj^orridor will be
patchy, due to the varied topography along the north shore p|^g^^ He^idhda^Lagoon, and may
not be large enough to place 25-meter permanent monipoHng transects. ThcTcfore, transej:t
lengths shall be adjusted to fit within the Diegan coasmsage scr^^el^^^^^areas, ^lye
permanent monitoring transects will be established in a
the revegetation areas at or before year three of the fiv^
transect data will be collected along each of these trans
sampling will utilize the point-intercept method at
Consistent sampling techniques will be used throuflTout I
lropriate^fesentat^'V^^aCibns*^^thin
^^^ptoring progr^^^mntitative
:ears three through H^. Transect
torvals along each transect,
^ring process to ensure
tetis will be established
etei
randomi^^i
shall be est
total percent
nearest
develo
accuracy in comparative analysis. Permanent photo^documentat. .
along each transect to record the progress ol^ihc icycgetatiuii p-i >/Knn and plant establishment
over the five-year monitoring period, ^ \^"'^'* • •
For southern coastal salt marsh hab^^^uadra^easurei^ii^^^ of transects, shall be used
to quantify plant cover. At y^^hree, ^pefore, t^quadrats shall be placed randomly
throughout the southern coasta^^marsl^^getat^p.reas along the temporary construction
corridor. The location of ^^^^o^ ^^^^^^^^^^^"^^^^^^^^^^"^ ^ yearly basis. For each
of the 10.,^f^&)Qa ^ one^^^^^are quadrat shall be placed at the identified
the su^^^^^telative percent cover of individual species and bare ground
^'^^^^^'^^^^^^^''^^ ^^^^ percent for the herbaceous layer. The
e pla^^^^Snative plants and bare ground will be quantified to the
Perman^ffi^ photo locations will also be established to document the
ime.
6f^ f MonitoriM Schedule
monthly during the 120-day plant establishment period, and quarterly for
ipletion of the installation and the initial 120-day maintenance period. The
resrcu^LjIfin^rr^rt shall be assessed in fall following planting to determine mortality of individuals,
initial success of the erosion seeding and functioning of the irrigation system. Thereafter, the site
will be monitored four times per year for five years, with monitoring reports submitted quarterly
and annual reports submitted at year end. Qualitative monitoring will be conducted during each
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DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT
site visit through the five-year monitoring period. Quantitative transect data collection will be
collected m the spring of Years three through five.
6.4 Annual Reports y!};
An annual report outlining the results of the habitat monit^jing wiU€eiubmitted to the City,
RWQCB, ACQE, CCC, USFWS and CDFG at the begii^ggl^f each^^^^^annual reports
will describe the existing conditions of the project site d|rived from aUalitl^Md^P^
and quantitative data to provide a comparison of anrg^succ^s^riteria wit^^^^nditions,
identify all shortcomings of the restoration plan, and ^^^§nd remedial m^^kstfiecessary
for the successful completion of the restoration pro]&t. Each yearly report will provide a
summary of the accumulated data. Annual reports also^^^uto^^the following:
• a list of names, titles, and companies ^dl'persons wh5^^|pcl the content of the
annual report and participated in m^^^^^^^tes; \
• a copy of the resource agency permi^^^y s^^^^gk^|^nd any subsequent letters
of modification; /
• prints of biological monitormg^otog^hs;
• maps identifying monitijnn|^ areas^lanting^ones, and weed removal areas as
appropriate.
The final-fifth'-year mori^mgreport shaflliffilBde a vegetation map of the project site depicting
the confi'g^^^^^ ext^^f^he w^land and upland vegetation communities across the site.
The final re^^^^^^ude r^^^^^^^tions for long-term maintenance activities and identify
shortcomings.^^^^^^that^^^quire ongoing attention by the long-term management
entity, ai^^dj
succes'
ittecitp the city and resource agency personnel for evaluation of project
COMPLETON OF MITIGATION
^ll^li^^^Notifi^^ of Completion
\\^rfSoiiitoiing data collected at the site indicate that the project has met performance criteria,
the City will notify the resource agencies upon submitting the annual report. Al native wetland
communities established onsite will not have been irrigated for a minimum of two years before
successful revegetation is considered to have been achieved.
DUDEK \&L ASSOCIATES, INC. | ——
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North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
61
DRArT CONCCPTLAL HABITAT REVEGETATION PLAN
NORTn AGLA IIEDIONPA SEWER - WESTERN SEGMENT
7.2 Regulatory Agency Confirmation and Site Turnover
Prior to final acceptance of the mitigation site, a wetland delineation may be conducted to verify
that j urisdictional wetland habitat has indeed been created by the mitigation effc^tat Site A. The
wetland delineation report may be submitted to the ACQE for review^d^app^oval prior to final
sign-off. Following receipt of the final annual monitoring report-Wdlhe notification of
completion, representatives from the City, RWQCB, AC0E^i€CC, USFWS and CDFC.i ma\'vi0
the NAHI mitigation site to confirm the completion of the^mitigation^fort and com; -lianccOTh
all permit conditions. \
7.3 Contingency Measures
If the final success criteria are not met, the City will prepare^an ^^^js of the cause(s) of
failure(s) and, it determined to be necessary by^^^^patgry agend^^ppose a remedial action
for approval. If the revegetation site has4iot-<met .tlie^peiforr^^e criterion, the Cit/s
maintenance and monitoring obligationsjiMinue uffiUhc fijiai [;J ^ct confirmation is obtained.
8.0 SELECTED BIBLIOGRAPHY
Atkinson, Philip W. 2003
Tiusfi\)i Qrnith
CalEPPC.^§99. frhe^CalFPrn
'we Recre
Nunni'
tertidal Habitats for Shorebirds^ British
Norfolk, U.K. Bulletin 100, pp. 67-71.
Qc tobcfS12pp,'r7u.^
^fl^Cf^ iiVi!.* J^*\- ^ ^J^^ JSb^
Califorr^^mtural
'#)ivision, Califo
ic Pest Plants of Greatest Ecological Concern in California.
tabase (CNDDB). 2003. Unpublished Report, Natural F4eritage
tment of Fish and Game, Sacramento, California. April to May.
Hlk & Associates, J^. 2003. Mitigation Feasibility Analysis - North Shore of Agua Hedionda
('"Pit _ Lagoon - City^^arlsbad, California. City of Carlsbad, California.
'''luJKam^A^^Mitchel. 1986. A Flora of San Diego County, California. Sweetwater River
^^^National City, CA.
Bossard, C, J. Randall, and M. Fioshovsky Ed. 2000. Invasive Plants of California's Wildlands.
University of California Press, Berkeley, CA.
IDUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Professlond Teams for CompUx ProjecU March 2004 62
DRAET CONCEPTLAL HABITAT REVEGETATION PLAN
NORTII AGLA IIEDIONDA SEWER - WESTERN SEGMENT
Brinson, M.M., Richard D. Rhemhardt, F. Richard Haeur, Lyndon C. Lee, Wade L. Nutter, R.
Daniel Smith, Dennis Whigham. 1995. A Guidebook for Application of Hydrogeomorphc
Assessments to Wetlands. US Army Corps of Engineers, Wetlands Research Program
Techmcal Report WRP-DE-11.
Cooke, S.S. 1996. Wetland and Buffer Fimctions Semi-^tmntitpive Assessment Methodology. Draft
User's Manual. Cooke Scientific Services, Seattle, Washington.
Department of Environmental Protection, Maine. Hot^Dated^Lmertidan^abitats. Available:
www.maine.gQv/dep/blwq/vollpt2.pdf. Accels&T.ebjtijIry 25, 2004^-,^
Hickman lames C. 1993. The Jepson Manual. Universityof Califomia Press, Berkeley, CA.
\ ' ,
^^^^^^^^
Holland, R.F. 1986. Preliminary Descriptio^of^^^Terre^^l^lral Communities of
California. Nongame-Heritage Prograni#lif^ma Departrnmf'of Fish and Came.
V - ' ^'^ ' ' /r
Neckles, Hilary A., Dionne, Michele, Burcfick, David M ."Roman, Charles T., Buchsbaum, Robert,
and Hutchins, Eric. 2002. /^0onitori^Protocol t^Aisess Tidal Restoration of Sal Marshes
on Local and Regional Scales! Ke&toratidn Ecolog)^ol. 10 No. 3, pp. 556-563.
Pacific Estuarine Research Laboratory. 1996My\4^fl for Assessing Restored and Natural Coastal
^ms%with Ex^^^^ South^^^iprnia. Biology Department, San Diego State
Zedler, Joy.
Diegt
sh Resthr^^^A Guidebook for Southern California. Second Draft. San
nivoibit) '"^^
\
DUDEK & ASSOCIATES, INC.
North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13
Professlond Teams for CompUx ProjecU March 2004 63