HomeMy WebLinkAbout3537; North Agua Hedionda Interceptor West Segment; North Agua Hedionda Interceptor West Segment; 2007-05-01May 1,2007 4775-05
Mr. Mark Biskup
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
Subject: Biological Resource Letter Report
NAHI Western Segment Realignment Project, Carlsbad, California
Dear Mr. Biskup:
INTRODUCTION
In October 2004, the City of Carlsbad certified a Final Environmental Impact Report (EIR) and
approved the North Agua Hedionda Interceptor (NAHI) Western Segment Sewer Maintenance
Access Road and Shoreline Protection Project. The purposes of that project was to restore the access
road that has deteriorated substantially over the years due to wave, water and wind erosion, and
provide shoreline stabilization to avert ftirther undermining and/or erosion, and to allow future
routine sewer maintenance cleaning, rehabilitation and emergency repairs of the westem segment of
the NAHI.
In September 2005, the City submitted a coastal development permit application to the California
Coastal Commission (Commission) for the project. As part of the Commission permit application
process, concerns were raised regarding construction of the shoreline protection wall as well as
impacts to environmentally sensitive habitat areas (ESHA) and wetlands. To address the
Commission's concerns, the City has re-designed the project to relocate the existing NAHI located
along the northern shoreline of the Aqua Hedionda Lagoon to further inland by utilizing micro-
tunneling techniques. The re-designed project, referred to as the "NAHI Westem Segment
Realignment Project," would eliminate the need to re-establish the sewer maintenance access road
and construct the associated trail, as well as construction of the shoreline protection wall and would
also avoid impacts to wetlands and to ESHA.
The purposes of this letter are to review the biological resources assessment conducted for the
original project and provide an updated assessment of impacts associated with the new realignment
project. This letter includes discussions of methodology, results (i.e., existing biological conditions),
impacts analysis, determination of significant impacts and recommended mitigation measures. This
letter report, along with the original Biological Resources Technical Report (Dudek 2004) provides
Mr. Mark Biskup
Re: B^lo^cal Resources Letter p^ejm^r^AHI Westem Segment Realignment Project 'y-
sufficient information to evaluate project impacts to biological resources pursuant to the California
Environmental Quality Act (CEQA), state and federal wetlands and endangered species regulations,
and the City of Carlsbad Habitat Management Plan (HMP).
METHODS
Sensitive biological resources present or potentially present onsite were identified through a
literature search using the following sources: U.S. Fish and Wildlife Service (2006), California
Natural Diversity Database (CDFG 2006 a, b, c), the California Native Plant Society (CNPS)
Inventory or Rare and Endangered Vascular Plants (CNPS 2006), 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 form Unitt (1984),
Ehrlich (1988), and Garrett and Dunn (1981) for Birds; Bond (1977) fOTHiammals; Stebbins (1985)
for reptiles and amphibians; and Emmel and Emmel (1973) for butterflies.
Dudek biologist Jeimifer Tximbull conducted a biological reconnaissance survey and general wildlife
survey of the project study area on January 15, 2007. The survey took place fi^om 1:15 to 3:45 pm
with weather consisting of clear skies, 60 to 65 degree temperatures, and winds that ranged fi"om
three to 12 miles per hour. During this survey the entire project area was walked and vegetation
communities within the project study area that were previously mapped by Dudek in 2001 were
visually confirmed. A more detailed delineation of vegetation community boundaries was conducted
within the proposed staging area B using a global positioning system (GPS) backpack unit with sub-
meter accuracy. All wildlife observed within the study area was recorded (Appendix B).
Following completion of the field work, the vegetation boimdaries were transferred to a topographic
base and digitized into an AutoCAD drawing. Using ArcCAD, a GIS coverage was created, and the
acreages of each vegetation type were determined.
All vegetation communities were mapped according to Holland (1986) with modifications to
accommodate the lack of conformity of the observed communities to those of Holland.
Wildlife species detected during the field survey by sight, vocalizations, burrows, and other sign
were recorded. Binoculars were used to aid in the identification of observed wildlife. Latin and
common names of animals referred to in this report follow Stebbins (1985) for reptiles and
amphibians, American Ornithologists' Union (1983,1989,2000) for birds, and Jones et al. (1997) for
mammals. A cumulative list of wildlife species observed on the project site during all surveys is
presented in Appendix B.
DUDEK 4775^5
2 May 2007
Mr. Mark Biskup
Re: Biological Resources Letter Report, NAJ^I Western Segment Realignment Project
RESULTS
Project Location
The proposed project is located along the north shore of Agua Hedionda Lagoon fijom Hoover Street
in the west to Cove Drive in the east (Figures 1 & 2). Land use within the study area has not
changed substantially since the 2004 report. Other physical characters such as hydrology, soils,
topography are also unchanged and exist as described in the 2004 report.
Vegetation Communities and Land Covers
Based on species composition and general physiognomy, eight native vegetation commimities or
habitat types were identified onsite: open water, intertidal mudflat, intertidal rocky shore, southern
coastal salt marsh, disturbed southern coastal salt marsh, disturbed southern willow scrub, coastal
sage scrub, and disturbed coastal sage scrub (Figures 3A-3E). In addition, five altered or non-native
vegetation communities or land covers are present: aimual (non-native) grassland, eucalyptus
woodland, disturbed land, ornamental, and developed land. The acreage of each vegetation
conununity and land cover type within the project study area, based on the 2007 survey, is presented
in Table L
In general, vegetation communities and land cover types exist in the same location and with the same
composition of species as documented in Dudek's previous Biological Resources Technical Report
(Dudek 2004). Changes observed during the January2007 site visit include the expansion of coastal
salt marsh near Hoover Drive, boundary adjustments of coastal sage scrub in and around proposed
staging area B, and conversion of land around the proposed eastern tunnel pit location.
Within the vicinity of staging area B, vegetation was mapped at a high level of detail. Three types of
communities were identified in the area: coastal sage scrub containing native shrub cover of 50% or
greater, disturbed coastal sage scrub supporting native shrub cover of 20 to 50%, and disturbed
habitat supporting native shrub cover less than 20%. A minimum mapping unit of 0.1 acrewasused
in the area in order to document any potential ESHA, The same mapping thresholds were used in the
assessment of highly disturbed land near the proposed eastern tuimel pit location. Although native
shrubs are present within that area, shrub cover is less than 20% in any given 0.1-acre area and
therefore the area is mapped as disturbed habitat.
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DUDEK 4775-05
3 May 2007
Mr. Mark Biskup
Re: Bioi>cal Resources Letter Report, NAHI Westem Segment Realignment PrpJ ect'
TABLE 1
EXISTING VEGETATION COMMUNITY & LAND COVER TYPES
Annual Grassland 0.08
Coastal Salt Marsh 0.60
Disturtied Coastal Salt Marsh 0.06
Coastal Sage Scrub 4.12
Disturt)ed Coastal Sage Scrub 0.63
Developed Land 8.87
Developed Land - Jurisdictional 0.05
Disturbed Land 5.11
Eucalyptus Woodland 0.38
Intertidal Mudflat 3.22
Intertidal Rocky Beach 0.25
Ornamental Plantings 0.77
Open Water 0.91
Disturbed Southern Wiliov/ Scrub 0.11
Jurisdictional Waters
In addition to the regulated wetland habitat types described above, two unvegetated ephemeral
stream channels occur in the project study corridor. These areas are defined by a bed and bank
support an ordinary high water level between one and three feet ^vide, but do not support wetland
vegetation. Rather, they support vegetation consistent with surrounding uplands. As stream
channels, these areas are considered non-wetland waters regulated by sections 401 and 404 of the
Clean Water Act and Sectionl600oftheFish and GameCode and are therefore considered sensiti^^ resources.
The alignment of the eastern drainage was modified as a result of the 2007 survey. This drainage
appears to have been realigned during construction of the private residence on that parcel.
Zoology-Wildlife Diversity
Cumulative survey visits to the project site resulted in the observation of 48 bird species 1 reptile
species, 5 mammal species, and 20 invertebrates, including 8 butterfly species and 12 'intertidal
DUDEK
4775-05
May 2007
Mr. Mark Biskup
Re: BiSlo'^ical Resources Letter Report, NAHI Westem Segment Realignment Project
species. Overall composition of wildlife species within the study area has not changed based on
conditions observed during the 2007 survey, A list of wildlife species observed within the project
area is presented in Appendix B.
Sensitive Plant Species
One sensitive plant species was confirmed within the project study area: southwestern spiny rush
(Juncus acutus spp. leopoldii). As was previously detennined, the site does not support habitat for
other sensitive plant species. A cumulative list of plant species observed within the project area is
presented m Appendix A.
Sensitive Wildlife Species
One federally-listed threatened wildlife species was confirmed to occupy habitat with the project
study area: two pairs of California gnatcatcher (Polioptila califomicd) . One non-listed wildlife
species considered locally sensitive, the salt marsh skipper (Panoquina errans) was previously
observed within the project study area and is considered to still be present based on unchanged
habitat conditions. Focused surveys resulted in observation of 16 individuals in seven locations
throughout the project alignment. The salt marsh skipper is a HMP covered species. The general
Agua Hedionda Lagoon environment supports habitat for other sensitive wildlife species including:
silvery legless lizard (Anniella pulchra pulchra), coastal westem whiptail {Cnemidophorus tigris
multiscutatusX orange-throated whiptail (Cnemidophorus hyperythrus beldingi), San Diego horned-
lizard (Phrynosoma coronatum blainvillei). Southern California rufous-crowned sparrow (Aimophila
ruficeps canescens), westem snowy plover (Charadrius alexandrinus nivosus), California homed
lark {Eremophila alpestris actia), loggerhead shrike (Lanius ludovicianus), large-billed savannah
sparrow (Passerculus sandwichensis rostratus), Belding's savannah sparrow (Passerculus
sandwichensis beldingi), white-faced ibis (Plegadis chihi), westem burrowing owl (Speotyto
cunicularia hypugaea), elegant tem (Sterna elegans), California least tem (Sterna antillarum
browni), Dulzura California pocket mouse, (Chaetodipus califomicusfemoralis), San Diego black-
tailed jackrabbit (Lepus califomicus bennettii), San Diego desert woodrat (Neotoma lepida
intermedia), and American badger (Taxidea taxus).
Wildlife Corridors and Habitat Linkages
Due to its location and surrounding residential development, the habitat present within the project
site is not connected to any substantial natural terrestrial habitat. Several small patches of coastal
sage scrub occur northeast of the site but are separated by development. These areas likely fimction
more as a buffer for waterbirds using the lagoon or intertidal area than as a movement corridor for
DUDEK 4775^5
5 May 2007
Mr. Mark Biskup
Re: Biological Resources Letter R^ort, NAHI Western Segment Realignment Project
upland species. The intertidal area also is not likely to fimction as a movement corridor as it is
bounded on both the east and west ends by marinas.
Regional Resource Planning Context
The lagoon lies within Local Facilities Management Plan Zone 1 as addressed in the City's Growth
Management Program. The planning standards for this zone include no net loss of wetlands,
preservation of coastal sage scrub, and management of natural habitats adjacent to the lagoon as
wetlands buffers. Unavoidable impacts should be mitigated by creation or enhancement of like
habitats adjacent to the lagoon or within biological core and linkage areas.
Agua Hedionda Lagoon and surrounding properties are also regulated by the City's Aqua Hedionda
Land Use Plan and Local Coastal Program (LCP) (1982). The LCP identifies the lagoon as
supporting water quality, viewshed, public use, and biological values that require protection.
The proposed project is located within the City of Carlsbad, which has a Habitat Management Plan
(HMP) approved in 2004, to guide biological resowce planning, protection and development within
the City in conformance with the NCCP. 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 vdthin the hardline FPA
(Figure 4). The project study corridor contains several habitat types considered sensitive by the
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 salt marsh skipper. As a public
infi-astructure project within the proposed FPA, the HMP allows for impacts to covered habitats and
species but also requires mitigation.
IMPACTS ANALYSIS
The project involves realigning the existing westem segment of the NAHI with a new forcemain
pipeline. The carrier pipeline would be constructed of thick wall High Density Polyethylene (HDPE)
with heat fiised (welded) joints, or bell and spigot PVC, dependent on constraction methods selected
by the Contractor. Total pipeline length would be approximately 2,257 linear feet. The Proposed
gravity pipeline will be installed using both conventional trenching methods and micro-tunneling
construction methods (Figure 5).
The various components of the project include: staging, trenching, microtunnelling, and
establishment of a section of non-improved new access road. Once construction has been completed,
DUDEK 4775^05
6 May 2007
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Mr. Mark Biskup
Re: Biological Resources Letter Report, NAHI Westem Segment Realignment Project
the existing westem segment of the NAHI will be abandoned in place. All aspects of the project are
incorporated into the Construction Footprint and considered a direct impact with the exception of
areas that are microtunnel only and non-improved access used for construction (Figures 6A-E).
The microtunnel only areas will have no ground disturbance during construction and the presence of
the undergrotmd pipe below the surface will not affect the viability , of vegetation or habitat
conditions and therefore no impacts would occur.
Construction access would utilize the existing compacted sandy base. Given that no material is
being deposited, no structures are being built, and future traffic will be uncommon, this aspect of the
project would not alter current environmental conditions in that area.
Proposed staging area B is depicted in Figure 6D as it is described in the temporary construction
easement for the project. However, construction plans and Mitigation Monitoring and Reporting
Plan (MMRP) for the project will note that additional resource avoidance is necessary in this area
due to the presence of coastal sage scmb. All direct impacts to coastal sage scrub (including
disturbed forms) within staging area B will be avoided during construction through the placement of
temporary fencing and monitoring by a qualified biologist. The project design feature will ensure
that the project results in no impacts to ESHA.
Direct Impacts
Implementation of the proposed project would result in impacts to vegetation communities and land
cover types listed in Table 2. No direct impacts to jurisdictional waters would occur as a result of
the project.
Regarding sensitive plant and wildlife species, the project avoids impacts to all known sensitive
plant and wildlife species locations as well as suitable habitat areas. Therefore, no direct impacts to
sensitive plant or wildlife species would occur.
Indirect Impacts
Indirect impacts to vegetation conrtmunities and waters from the proposed project primarily would
result from adverse construction-related "edge effects" that may include dust, soil erosion, pollution,
siltation, and runoff. Most of the indirect impacts to vegetation communities and waters can also
affect sensitive wildlife, in addition, short-term noise during construction has the potential to affect
wildlife activity including bird breeding behavior.
DUDEK 477W)5
7 May 2007
Mr. Mark Biskup
Re: Biological Resources Letter Report, NAHI Westem Segment Realignment Project
TABLE 2
IMPACTS TO VEGETATION COMMUNITIES & LAND COVER TYPES
Annua! Grassland 0.00
Coastal Salt Marsh 0.00
DistuFt)ed Coastal Salt Marsh 0.00
Coastal Sage Scrub 0.00
Disturt}ed Coastal Sage Scrub 0.00
Developed Land 0.22
Developed Land ~ Jurisdictional 0.00
Disturbed Land 1.26
Eucal^tus Woodland 0.00
Intertidal Mudflat 0.00
Intertidal Rocky Beach 0.00
Ornamental Plantings 0.01
Open Water 0.00
Disturbed Southern Willovi/ Scrub 0.00
SIGNIFICANCE/MITIGATION
Direct impacts to disturbed land, developed land, and ornamental plantings are not considered
significant due to the lack of native species utilizing these land cover types.
The indirect short-term impacts of dust, soil erosion, pollution, siltation, runoff, and noise from
construction activities are significant to vegetation communities, jurisdictional waters, and sensitive
wildlife. These impacts may be mitigated by the implementation of a Best Management Practices
(BMP) plan approved by the City that may include tiie use of silt fencing, straw bales, gravel bags,
and stabilized construction entrances prior to construction. Noise related impacts to sensitive
breeding birds including the California gnatcatcher may be mitigated by avoiding construction
activities during the breeding season or by the maintenance of noise levels below 60 dBA Leq at
occupied nest locations of sensitive species. The maintenance of appropriate noise levels would be
confirmed through nesting bird surveys to determine the presence of sensitive nesting birds within
500 feet of the project construction and noise measurements at nest locations during peak
construction activity by a qualified acoustician.
DUDEK 4775-05
May 2007
Mr. Mark Biskup
Re: Biological Resources Letter Report, NAHI Westem Segment Realignment Project
HMP COMPLIANCE
The proposed project is compliant with the HMP as it would avoid direct impacts to covered species
and habitat. With the implementation mitigation measures for indirect impacts, no resources covered
by the HMP would be affected by implementation of the project.
If you have any questions or comments, please do not hesitate to contact me at (760) 479-4284.
Very truly yours,
^^pul Jos
Biologist
An. Figures 1 — 6
cc: Pam Drew, City of Carlsbad
John Porieous, Dudek
Russ Berhoh, Dudek
LITERATURE CITED
Bond, S.I. 1977. Annotated List of the Mammals of San Diego County, California. Trans. San
Diego Soc. Nat. Hist. 18:229-248.
California Department of Fish and Game, Nauiral Diversity Data Base (CDFG). 2006a. Rarefind.
Version 3.0.5. Computer database. March 3,2006.
m California Department of Fish and Game, Natural Diversity Data Base (CDFG). 2006b. Special
Animals. Biannual publication, mimeo. February 2006. 55 pp.
California Department ofFish and Game, Natural Diversity Data Base (CDFG). 2006c. Special
Vascular Plants, Bryophytes, and Lichens List. Biannual pubHcation, mimeo. May2006. 96
pp.
California Native Plant Society (CNPS). 2006. Inventory of Rare and Endangered Plants (online
edition, v7-06b 4-18-06). California Native Plant Society. Sacramento, CA.
DUDEK 4775^5
9 May 2007
Mr. Mark Biskup
Re: Biological ResourcesLeifer Report, NAHI Westem Segment Realignment Prdject
Carlsbad, City of2005. Habitat Management Plan (HMP). Carlsbad, CA.
Dudek 2004. Biological Resources Technical Report for tiie NAHI Westem Segment Maintenance
Access Road, and Shoreline Stabilization Project. Endnitas, CA.
Ehrlich, P.R. 1988. The Birder's Handbook: a Field Guide to tiie 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 Southem California. Natural History
Museum of Los Angeles County, Science Series 26:1-148.
Garrett, K. and J. Dunn. 1981. Birds of Southem California: Status and Distribution. Los Angeles
Audubon Societ>% Los Angeles, California.
SANDAG (San Diego Association of Governments). 2001 Multiple Habitat Conservation Program
CD-ROM
Stebbins, R.C. 1985. A Field Guide to Westem Reptiles and Amphibians. Houghton Mifflin Co.,
Boston, Mass.
United States Fish and Wildlife Service (USFWS). 2006. Endangered and Threatened Wildlife and
Plants; Review of Native Species that are Candidates or Proposed for Listing as Endangered
or Threatened; Annual Notice of Findings on Recycled Petitions; Annual Description of
Progress on Listing Actions. Federal Register 71(176): 53756 - 53835.
Unitt, P.A. 1984. Birds ofSan Diego County. Memoir 13, San Diego Society of Natural History.
DUDEK
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North Agua Hedionda Sewer Western Segment Realignment Project
Biological Resources Letter Report
Regional Map
FIGURE
m
i\ > Legend
Proposed Realignment
*H • ^— Existing NAHI Western Segment
XsOURCE: USGS 7.5 Minute^eries, San Luis Rey Quadrangle
500 Feet
North Agua Hedionda Sewer Western Segment Realignment Project
Biological Resources Letter Report
Vicinity Map
FIGURE
i ft i » i « ft « 1 I i i il i< fti t« fci K « «
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
BEST OR!Q!NAL^'°'°^'^^' & Jurisdictional Delineation Index Map
l« k« fta ii ii i I I i I i i t <b a k
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 vegetatton type designator indicates that it is disturbed.
An upper case 'J' following a vegetation type designator indicates that it is Jurisdictional.
. r A: Waters of the U. S.
(Plumber Indicates width of unvegetated
channel.)
O Data Station
SENSITIVE ANIMAL SPECIES:
CAGHOl California gnatcatcher (Dudek, 2001)
CAGN07 California gnatcatcher (Dudek, 2007)
SMS Salt marsh skipper (Dudek, 2003)
BASE PHOTO SOURCE: CITY OF CARLSBAD
SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. (AOJUSTED TO TOPOGRAPHIC FEATURES)
ORN
ow
Ornamental
Open Water
SWS Southem Willow Scrub
Study Area
Existing Sewer System
CAGN General Area of
Calling/Movement (2001^
SENSITIVE PLANT SPECIES:
Ac Adolphia caUfomica
Ja Juncus acutus ssp, leopoldii
NOTE: Number Indicates Indlvtdual plant
counts at that location.
North Agua Hedionda Sewer Western Segment Realignment Project • Biological Resources Letter Report
Biological Resources & Jurisdictional Delineation Map
FIGURE
3B
ii ij |j II lia ill ki It 12 U i tt i fei ft« tta Ki
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Biological Resources & Jurisdictional Delineation Map
FIGURE
3C
I HA ftl ii kill fci fci ki h i k 4 k ti k » k
I SEE FIGURE 3B FOR BIOLOGICAL
I RESOURCES LEGEND
ow-SMS2 SCALE IN FEET
North Agua Hedionda Sewer Western Segment Realignment Project • Biological Resources Letter Report
Biological Resources & Jurisdictional Delineation Map
FIGURE
3D
^1 ii Ii Ii ii ftl fti fci fc« fti fei ftl ii
I SEE FIGURE 3B FOR BIOLOGICAL
i RESOURCES LEGEND
160
SCALE IN FEET
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Biological Resources & Jurisdictional Delineation Map
Vegetation / Landcover:
Agriculture
Chaparral
Sage Scrub
Developed
Disturbed Habitat
Grassland
I Open Water
Riparian Scrub / Woodland
Wetland
Woodland
Species Common Species Common
Label Name Label Name
AC California adolphia LH Loggerhead shrike
AG Del Mar manzanita LR Light-footed clapper rail
Al San Diego thorn-mint LT California least tern
BC Long-billed curlew MD Southern mule deer
BF Thread-leaved brodiaea MS Saltmarsh skipper
BJ S.D. black-tailed jackrabbit NE Black-crowned night heron
BK Black-shouldered kite NH Northern harrier
BS Belding's Savannah sparrow OS Osprey
BW Burrowing owl OW Orange-throated whiptail
CG California gnatcatcher QD Nuttall's scrub oak
CH Cooper's hawk RP CA rufous-crowned sparrow
CL Del Mar Mesa sand aster SC Ashy spike-moss
CV Wart-stemmed ceanothus SP San Diego pocket mouse
DD Blochman's dudleya ST Nan-ow-leaved nightshade
DL Double-crested cormorant BY Summer holly
DO Western dichondra TG Two-striped garter snake
EU Cliff spurge TV Turkey Vulture
GE Golden eagle WF SW willow flycatcher
GS Grasshopper sparrow WG Western grebe
HL San Diego horned lizard WP Western snowy plover
JA Southwestern spiny rush YC Yellow-breasted chat
LB Least Bell's vireo YW Yellow warbler
SOURCE: City of Carlsbad & SANDAG .
e 750 1,500 3,000
Feet North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Regional Vegetation & Species and Proposed FPA Hard/Soft Lines Map
FIGURE
4
AERIAL SOURCE: AIRPHOTO USA, JAN 2006
Legend
O Proposed Access Holes
• Proposed Access Hole Rehabilitation
Relocated NAHI using Conventional Open Trench
Relocated NAHI using Microtunneling
Proposed Sewer Lateral
(Reconnect existing lateral and provide new
lateral stub connection using conventional
open trench construction)
Microtunneling Pit Area
Staging Area
, Proposed Non-improved Sewer Access Road
— Existing Sewer System
— Existing Sewer Easement
— Existing Property Lines
100 200
iFPPt
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Project Components
FIGURE
SEE FIGURE 6B FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Realignment Project • Biological Resources Letter Report
Biological Resources & Jurisdictional Delination Map
with Construction Footprint & Non-Improved Access Road 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 MudHat
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
Relocated
Conventional Open Trench
Relocated Microtunneling
Microtunneling Pit Area
Staging Area
SENSITIVE ANIMAL SPECIES:
CAGNOI California gnatcatcher (Dudek, 2001)
CAGH07 California gnatcatcher (Dudek, 2007)
SMS Sa/£ marsh skipper (Dudek, 2003)
BASE PHOTO SOURCE: CITY OF CARLSBAD
SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. (ADJUSTED TO TOPOGRAPHIC FEATURES)
ORN
OW
SWS
Ornamental
Open Water
Southern Willow Scrub
' Study Area
Construction Footprint
Impact
Proposed Non-Improved
Access Road Impact
Proposed Sewer Lateral
Existing Sewer System
CAGN General Area of
Calling/Movement (2001)
SENSITIVE PLANT SPECIES:
Ac Adolphia califomica
Ja Juncus acutus ssp. leopoldii
NOTE: Number indicates individual plant
counts at that location.
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Biological Resources & Jurisdictional Delination Map
with Construction Footprint & Non-Improved Access Road Impacts
North Agua Hedionda Sewer Western Segment Realignment Project • Biological Resources Letter Report
Biological Resources & Jurisdictional Delination Map
with Construction Footprint & Non-Improved Access Road Impacts
FIGURE
6C
SEE FIGURE SB FOR BIOLOGICAL
RESOURCES LEGEND
North Agua Hedionda Sewer Western Segment Realignment Project - Biological Resources Letter Report
Biological Resources & Jurisdictional Delination Map
with Construction Footprint & Non-Improved Access Road Impacts
FIGURE
6D
I SEE FIGURE 6B FOR BIOLOGICAL
I RESOURCES LEGEND
160
SCALE IN FEET
North Agua Hedionda Sewer Western Segment Realignment Project • Biological Resources Letter Report
Biological Resources & Jurisdictional Delination Map
with Construction Footprint & Non-Improved Access Road Impacts
FIGURE
6E
APPENDIX A
CUMULATIVE UST OF PLANT SPECIES OBSERVED ONSITE
VASCULAR PLANT SPECIES
ANGIOSPERMAE (DICOTYLEDONES)
ACANTHACEAE - ACANTHUS FAMILY
* Thunbergia alata - black-eyed susan vine
AIZOACEAE - CARPET-WEED FAMILY
* Aptenia cordifolia - aptenia
* Carpobrotus edulis - Hottentot-fig
* Mesembryanthemum crystallinum - crystal ice plant
* Mesembryanthemum nodijlorum - sea-fig
AMARANTHACEAE - AMARANTH FAMILY
Amaranthus blitoides - prostrate amaranth
ANACARDIACEAE - SUMAC FAMILY
Malosma laurina - laurel sumac
Rhus integrifolia - lemonadebeny
Rhus ovata - sugar bush
Toxicodendron diversilobum - poison-oak
APIACEAE - CARROT FAMILY
* Foeniculum vulgare - sweet fennel
APOCYNACEAE - DOGBANE FAMILY
* Nerium oleander - oleander
ASTERACEAE - SUNFLOWER FAMILY
Ambrosia confertifolia - weak-leaved burweed
Ambrosia psilostachya var. califomica - western ragweed
Artemisia califomica - coastal sagebrush
Artemisia douglasiana - California mugwort
Baccharis pilularis - coyote brush
Baccharis salicifolia - mule fat
Baccharis sarothroides - broom baccharis
* Conyza canadensis - horseweed
* Chrysanthemum coronarium - garland chrysanthemum
L^w Wi-ix ^ ^ May 2007
APPENDIX A
CARYOPHYLLACEAE - PINK FAMILY
* Spergularia bocconii - sand-spurrey
CHENOPODIACEAE - GOOSEFOOT FAMILY
Atriplex lentiformis- big saltbush, quail brush
** Atriplexpacifica - south coast saltbush
^ Atriplexpatula - spear oracle
^ * Atriplex semibaccata - Australian saltbush
Atriplex triangularis - spearscale
* * Bassia hyssopifolia - five-hooked bassia
* * Chenopodium ambrosioides - Mexican tea
* Chenopodium murale - nettle-leaved goosefoot
Salicomia subterminalis - Parish's pickleweed
Salicomia virginica - common pickleweed
* Salsola tragus - Russian-thistle
<m Suaeda califomica - California sea-blite
CONVOLVULACEAE - MORNING-GLORY FAMILY
Calystegia macrostegia - westem bindweed
- Cressa truxillensis - alkali weed
m
CRASSULACEAE - STONECROF FAMILY
Crassula argentea - jade plant
* Dudleya pulverulenta - chalk dudleya
CUSCUTACEAE - DODDER FAMILY
Cuscuta salina - salt marsh dodder
urn
* EUPHORBIACEAE - SPURGE FAMILY
^ Chamaesyce sp. - spurge
* Ricinus communis - castor-bean
FABACEAE - PEA FAMILY
« Lotus scoparius - deerweed
* Medicago polymorpha - California biirclover
DUDEK 477S05
A-3 May 2007
m
APPENDIX A
g^MULATIVmy^llE^ PLANT SPEglES QBSB?VED ONSITE SI
POLYGONACEAE - BUCKWHEAT FAMILY
Eriogonumfasciculatum - California buckwheat
* Rumex crispus - curly dock
PRIMULACEAE - PRIMROSE FAMILY
* Anagallis arvensis - scarlet pimpernel
RUBIACEAE - MADDER FAMILY
Galium angustifolium - narrow-leaved bedstraw
- SALICACEAE - WILLOW FAJVHLY
^ Populusfremontii - Fremont's cottonwood
^ Salix exigua - narrow-leaved willow
Salix gooddingii var. gooddingii - black willow
" Salix lasiolepis var. bracelinae - arroyo willow
m
SAURURACEAE - LIZARD'S-TAIL FAMILY
Anemopsis califomica - yerba mansa
SOLANACEAE - NIGHTSHADE FAMILY
« * Datura wrightii - westem jimsonweed
Lycium califomicum - California box-thom
Nicotiana glauca - tree tobacco
TAMARICACEAE - TAMARISK FAMILY
^ * Tamarix sp. - tamarisk
URTICACEAE - NETTLE FAMILY
• Urtica dioica - giant creek nettle
^ ZYGOPHYLLACEAE - CALTROP FAMILY
* Tribulus terrestris - puncture vine
* ANGIOSPERMAE (MONOCOTYLEDONES)
ARECACEAE - PALM FAMILY
m
Washingtonia robusta - fan palm
DUDEK
A-5 May 2007
T ^ ' APPENDIX A
^^' mvm^mE us^mmfims^ms OBSERVED ONSITE
ZOSTERACEAE - EEL-GRASS FAMILY
Zostera marina - eel-grass
signifies introduced (non-native) species
4775-05
May 2007
m
m
m
A^pr^^r V APPENDIX B
j4CUMliM^e/gy^l^ SPECIES 0^§€RVED ONSITE
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
CoUisella scabra - rough limpet
Littorina sp. (probably L. scutulata)- periwinkle species
Lottia gigantea - giant owl limpet
Tegula funebralis - black tegula
CLASS BIVALVLV - CLAMS, COCKLES, MUSSELS, OYSTERS, SHIPWORMS, ETC.
Mytilus edulis - blue mussel
Ostrea lurida - Pacific oyster
Tagelus subteres - razor clam
Argopecten aequisulcatus - speckled scallop
Tresus nuttalli - gaper clam
BUTTERFLIES AND MOTHS
HESPERHDAE - SKIPPERS
Hylephila phyleus - fiery skipper
Panoquina errans - salt marsh skipper
PIERIDAE - WHITES AND SULFURS
Pieris rapae - cabbage butterfly
LYCAENIDAE - BLUES, HAIRSTREAKS, & COPPERS
Brephidium exile - pygmy blue
Leptotes marina - marine blue
Blue species
DUDEK
B-1 May 2007
FNL APPENDIX B
'£aJSTX)F WILDLIFESPECIES OSBERVED ONSITE
« Actitis macularia - spotted sandpiper
^ Calidris mauri - westem sandpiper
^ Catoptrophorus semipalmatus - willet
Limosa fedoa - marbled godwit
* Numenius americanus — long-billed curlew
M Numenius phaeopus - whimbrel
LARIDAE - GULLS & TERNS
Larus occidentalis - westem gull
^ Larus califomicus - California gull
m Sterna caspia - Caspian tem
Sterna forsteri - Forster's tem
* ACCIPITRIDAE - HAWKS
V Buteo jamaicensis ~ red-tailed hawk
FALCONIDAE - FALCONS
Falco sparverius - American kestrel
PHASIANIDAE - PHEASANTS & QUAILS
Callipepla califomica - California quail
COLUMBIDAE - PIGEONS & DOVES
Columba livia - rock dove
Zenaida macroura - mourning dove
TROCHILIDAE - HUMMINGBIRDS
Calypte anna - Aima's hununingbird
Calypte costae - Costa's hummingbird
TYRANNIDAE - TYRANT FLYCATCHERS
Sayomis nigricans ~ black phoebe
Sayomis soya — Say's phoebe
Tyrannus verticalis - westem kingbird
Tyrannus vociferans ~ Cassin's kingbird
DUDEK 4775-05
B-3 May 2007
r Fi F:>ini> APPENDIX B
.ftWiGUMULATiVE LIST£>RWLDLIFE~SPECIES OBSERVED ONSITE
MAMMALS
LEPORIDAE - HARES & RABBITS
Sylvilagus bachmani ~ bmsh rabbit
GEOMYIDAE - POCKET GOPHERS
Thomomys bottae - Botta's pocket gopher
HETEROMYIDAE - POCKET MICE & KANGAROO RATS
Chaetodipus califomicus - California pocket mouse
CANIDAE - WOLVES & FOXES
* Cams familiaris - domestic dog
MUSTELIDAE - WEASELS, SKUNKS, & OTTERS
Mephitis mephitis - striped skunk
signifies introduced (non-native) species
DUDEK 4775-05
B-5 May 2007