HomeMy WebLinkAbout3190; Rancho Sante Fe Road Bridge Replacement; Rancho Sante Fe Road Bridge Replacement; 2000-12-01DRAFT
CONCEPTLAL WETLAND MITIGATION AND
MONITORING PLAN
rOR THE RANCnO SANTA EE ROAD REALIGNMENT
AND BRIDGE REPLACEMENT PROJECT
] CITY or CARLSBAD, CALIEORNIA
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*' Prepared for:
- CITY OF CARLSBAD
PUBLIC WORKS - ENGINEERINCi!
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1635 Faraday Avenue
Carlsbad, California 92008
Contact: Douglas Helming
TeL (760) 92.9-1600
Prtpartd by:
DUDEK
& ASSOCIATES, INC.
m PmfessioTuiI Teams for Complex Projects
m 605 Tfiird Street
li Encmitas, Califorma 92024
Sherri L Milltr, Stnior Biologist
ohn L Minchin, Landscape Architect # 2225/
m ( / Habitat Restoration Specialist
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DECEMBER 2000
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
TABLE OF CONTENTS
Section Page
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EXECUTIVE SUMMARY iv
1.0 PROJECT DESCRIPTION AND SITE EVALUATION 1
1.1 Location of Project 2
1.2 Brief Summary of Regulatory Framework 2
1.3 Responsible Parties 5
1.4 Jurisdictional Areas Affected by the Project 5
1.5 Functions and Values of Areas Affected by the Construction Work 7
1.5.1 Water Quahty Issues 7
1.5.2 Rare Or Endangered Species 8
1.5.3 Plant Communities/Habitats 9
1.5.4 Wildhfe 10
1.6 Impacts to Jurisdictional Areas 11
2.0 WETLAND MITIGATION PROGRAM 12
2.1 Goal of Mitigation 12
2.1.1 Types of Habitat to be Created 13
2.1.2 Functions and Values of Habitat to be Created 15
2.1.3 Time Lapse 20
2.1.4 Cost Estimate 20
2.2 Final Success Criteria 21
2.2.1 Existuig Functions and Values of Mitigation Area 21
2.2.2 Target Functions and Values 22
2.2.3 Target Hydrological Regime 22
2.2.4 Target Jurisdictional Acreage to be Created and Enhanced 23
2.3 Proposed Mitigation Areas 23
2.3.1 Location and Size of Mitigation Areas 24
2.3.2 Present and Proposed Uses of Mitigation Area 24
2.4 Implementation Plan 27
2.4.1 Rationale for Expecting Implementation Success 27
2.4.2 Prehminary Schedule 28
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
TABLE OF CONTENTS [CONTmUEm
Section Page
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2.4.3 Site Preparation 29
2.4.4 Final Landscape/Revegetation Plans 30
2.4.5 Temporary Irrigation System 31
2.4.6 As-Built Conditions 32
2.5 Maintenance During Monitoring Period 32
2.5.1 Makitenance Activities 33
2.5.2 General Habitat Maintenance GuideUnes 34
2.5.3 Schedule of Maintenance/Monitorhig Inspections 35
3.0 MONITORING PLAN 35
3.1 Performance Standards 35
3.2 Monitoring Methods 38
3.3 Annual Reports 38
3.4 Schedule for Monitoring 39
3.5 Completion of Mitigation 39
3.5.1 Notification of Completion 39
3.5.2 Regulatory Agency Confirmation 39
3.6 Contingency Measures 40
3.6.1 Procedures for Initiating Contmgency Measures 40
3.6.2 Funding Mechanisms 40
4.0 ACKNOWLEDGMENTS 40
UTERATURE CITED AND REFERENCED 40
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1576-9
Praftuioiwl Teonu jm Complei Projfcti December 2000
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
TABLE OF CONTENTS KCONTMNUEm
Page
LIST or riGLRCS
Figure 1 Regional Map 3
Figure 2 Vicmity Map 4
Figure 3 Jurisdictional Impact Areas 1 & 2 and Onsite Revegetation 6
Figure 4 Biological Resources Map (University Commons Area) 14
Figure 5 Jurisdictional Delineation Map of University Commons Area
With Offsite Revegetation Site 16
Figure 6 Conceptual Revegetation Map (Offsite Location) 25
Figure 7 Site Photos 26
LIST or TABLrS
Table 1 Acreage Impacts to Jurisdictional Areas
for the Proposed Project 12
Table 2 Mitigation Summary for Permanent and Temporary Impacts 13
Table 3 Recommended Container Plants and Seed Mix for
Southem Willow Scrub Revegetation 17
Table 4 Recommended Container Plants and Seed Mix for
Freshwater Marsh Revegetation 18
Table 5 Recommended Container Plants and Seed Mix for
Southern Willow Scrub Enhancement 18
Table 6 Recommended Seed Mix for Restoration of Wetland Habitats 19
Table 7 Recommended Seed Mix for Restoration of Wetland Habitats 18
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DUDEK
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1576-9
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
EXECUTIVE SUMMARY
The purpose of this Conceptual Wetland Mitigation and Monitoring Plan is to outline
appropriate revegetation measures to mitigate impacts to biological resources that will result from
the Rancho Santa Fe Road reaUgnment and bridge replacement (proposed project). The City of
Carlsbad proposes to widen and realign Rancho Santa Fe Road from two lanes to an ultimate six
lane prime arterial roadway, from approximately 100 feet south of the La Costa Avenue/Rancho
Santa Fe Road intersection to approximately 100 feet north of the Melrose Drive/Rancho Santa
Fe Road intersection. The proposed project also includes the replacement of the bridge crossing
at San Marcos Creek. The project site is located in the approved Fieldstone Habitat Conservation
Plan that encompasses 1,940.2 acres of land in southeast Carlsbad.
Implementation of the proposed project wiU permanently hnpact a total of 0.69 acre of
jurisdictional wetlands, comprised of 0.42 acre of southem wiUow scrub and 0.27 acre of
disturbed wetlands. In addition, 0.24 acre of unvegetated, ephemeral waters wiU be permanently
impacted. To mitigate for these permanent unpacts, this Conceptual Wetland Mitigation and
Monitoring Plan outluies guidelines for the creation of wetland habitats composed of southern
wiUow scrub and freshwater marsh. Proposed mitigation for permanent knpacts to southern
willow scrub wiU consist of creation of 1.26 acres of southern wiUow scrub. Proposed mitigation
for permanent impacts to disturbed wetland habitat wiU consist of the creation of 0.27 acre of
freshwater marsh habitat and enhancement of 0.54 acre of freshwater marsh habitat. Proposed
^ mitigation for permanent impacts to unvegetated ephemeral waters of the U.S. wiU consist of the
^ creation of 0.24 acres of freshwater marsh habitat.
* The proposed mitigation site for permanent impacts resulting from the Rancho Santa Fe Road
Realignment and Bridge Replacement Project wiU be located offsite withki the University
^ Commons project along San Marcos Creek. The proposed offsite mitigation area is located
g| immediately east of Rancho Santa Fe Road along the margins of San Marcos.
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Temporary wetland impacts associated with the Rancho Santa Fe Road ReaUgnment and Bridge
Replacement Project construction will include 0.97 acre of southern v^iUow scrub. Proposed
mitigation for temporary impacts to southem wiUow scrub consist of onsite restoration of 0.54
acre of southern wiUow scrub within the areas of temporary knpact. Because of bridge shading
effects, creation of 0.43 acre of southern wiUow scrub and enhancement of 0.86 acre of southern
wiUow scrub wiU occur at the proposed offsite mitigation area.
DUDEK & ASSOCIATES, INC.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
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A total of 4.14 acres of wetland habitat creation, enhancement and restoration wiU be provided
kl order to compensate for total knpacts of 1.90 acres (i.t., permanent knpacts to 0.69 acre of
wetlands and 0.24 acre of unvegetated, ephemeral waters and for temporary impacts to 0.97 acre
of wetlands).
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This Conceptual Wetland Mitigation and Monitormg Plan has been prepared in accordance with
the guidelines recommended by the U.S. Army Corps of Engkieers (ACOE) for mitigation plan
preparation. This plan presents information on project location and work descriptions,
permitting requirements, project impacts, mitigation requirements, planting and irrigation
recommendations, maintenance requkements, monitorkig methodology and final revegetation
success criteria.
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DUDEK &ASSCX:iATES, INC.
1576-9
IV<>fwlon<dT«nuf<>rCon>t>laPr<>M' DeCembSr 2000
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
1.0 PROJECT DESCRIPTION AND SITE EVALUATION
The City of Carlsbad (the AppUcant) proposes to widen and reaUgn Rancho Santa Fe Road from
two lanes to an ultknate six lane prkne arterial roadway ki the eastem portion of the City of
Carlsbad and western portion of San Marcos, CaUfornia. The proposed project wiU widen and
reaUgn Rancho Santa Re Road from approximately 100 feet south of the La Costa
Avenue/Rancho Santa Fe Road intersection to approxknately 100 feet north of the Melrose
Drive/Rancho Santa Fe Road kitersection. The proposed project also kicludes the replacement
and relocation of the San Marcos Creek bridge crossing. In accordance with the City of
Carlsbad's General Plan and the 1992 Envkonmental Impact Report (EIR), Rancho Santa Fe Road
wUl be upgraded to a Prime Arterial Roadway which wiU include a 126-foot right-of-way
contakiing six travel lanes, bike lanes, an 18-foot wide raised median, sidewalks, curb and gutter.
The proposed project is divided into Phases 1 and 2. Phase 1 includes the realignment of
approxknately 7,000 feet of Rancho Santa Fe Road from La Costa Avenue to the bridge and the
removal of the existmg Ranch Santa Fe Road. Phase 2 consists of the proposed bridge
replacement as weU as the reaUgrmient of the 2,200 feet approach from Melrose Drive to
approximately 600 feet south of the Questhaven/Rancho Santa Fe Road intersection.
The project site is located ki the approved City of Carlsbad's Fieldstone/La Costa Associates
Habitat Conservation Plan (HCP) that encompasses 1,940.2 acres of land in southeast Carlsbad.
Implementation of the proposed project wiU permanently impact 0.42 acre of southem willow
scrub, 0.27 acre of disturbed wetlands and 0.24 acre of unvegetated ephemeral waters of the U.S.
Temporary impacts include 0.97 acre of southem wiUow scrub. These habitat types are
considered jurisdictional wetlands and waters. The proposed mitigation program will include a
total of 2.2 acres of offsite creation and 1.40 acres of offsite enhancement of jurisdictional
southern willow scrub and freshwater marsh habitats. The proposed mitigation area is located
immediately east of the project corridor within University Commons along San Marcos Creek
{Figurts 4 and 5). The mitigation area will be preserved as an element of the Fieldstone HCP. In
addition, 0.54 acre of jurisdictional southern wiUow scrub habitat wiU be restored onsite within
the area of impact along San Marcos Creek.
In order to determine the appropriate mitigation measures for the project, the pre-existkig
conditions of the proj ect site were assessed through a plant community/habitat survey, a wetland
DUDEK
& ASSOCIATES, INC.
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p™;i™i™iT«<iwji>r Comple. PMi«ci» December 2000
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
deUneation and general wildlife surveys conducted from 1990 to 2000 by biologists from Dudek
& Associates, Inc. (DUDEK), HeUx Envkonmental (HELIX) and Sweetwater Envkonmental
(SEB). AdditionaUy, site evaluations to determkie mitigation/revegetation potential at the
proposed onsite mitigation areas as weU as within the University Commons project were
conducted by Myloc Nguyen (Biologist/Habitat Restoration SpeciaUst) and John L. Mkichki
(Landscape Architect#2225/Habitat Restoration SpeciaUst) in September and October 2000. The
site visits mcluded mapping of potential creation and enhancement areas.
1.1 Location of Project
The proposed project site occupies 138 acres in the eastern portion of the City of Carisbad and
western portion of the City of San Marcos, CaUfornia, approxknately one mile southwest of Lake
San Marcos {Figurt 1). Rancho Santa Fe Road defines the jurisdictional boundary between
Carlsbad and San Marcos. Residential developments are located west of the existing Rancho
Santa Fe Road in the southern portion of the project site and north of San Marcos Creek. An
kidustrial park is situated northeast of Rancho Santa Fe Road and Questhaven Road. Vacant
lands occupy areas west of existing Rancho Santa Fe Road ki association with San Marcos Creek
and areas on the east side of existkig Rancho Santa Fe Road between La Costa Avenue and
Questhaven Road. The project footprkit lies within the northwestern portion of the Rancho
Santa Fe, CaUfornia, U.S. Geological Survey 7.5 minute quadrangle; Sections 1,6,19,20,29,30,
31 and 32; Townships 12 and 13 South; Range 3 and 4 West; longitude 117°13' 29" and latitude
33°05'42" {Figurt 2). The project site is located in the City of Carlsbad's Fieldstone/La Costa
Associates HCP.
1.2 Brief Summary of Regulatory Framework
This mitigation plan addresses biological knpacts that are regulated by the Federal Clean Water
Act and the California Fish and Game Code; and administered by the U.S. Army Corps of
Engmeers (ACOE), Califomia Department of Fish and Game (CDFG) and the Regional Water
QuaUty Control Board (RWQCB). This plan outlmes mitigation and revegetation strategies that
wiU fulfiU the regulatory requirements ofthe Federal Clean Water Act and CaUfornia Department
of Fish and Game Code and wiU support applications for issuance of ACOE 404 Nationwide
g| permks 14,18,33 and a CDFG 1601 Streambed Alteration Agreement. This plan is designed to
comply with regulatory requirements to achieve ''No Net Loss of Wetlands."
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Orange
County
San Orego
r-SMiles Tijuana
MBXICO
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Conceptual Wetland Mitigation and Monitoring Plan • Rancho Santa Fe Road
Regional Map
FIGURE
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Offsite Ranctro Santa Fe Road
Revegetation Site
(See Figure 6)
University Commons
Revegetation Sites
-^--w i:-;-^rm
BASE MAP SOURCE: USGS 7.5 Minute Series, Rancho Santa Fe Quadrangle l"-2000'
Conceptual Wetland Mitigation and Monitoring Plan - Rancho Santa Fe Road
Vicinity Map
FIGURE
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
to 1.3 Responsible Parties
This Conceptual Wetland Mitigation and Morutormg Plan is submitted on behalf of the City of
Carlsbad (the Applicant). The representatives for the Applicant are Mr. Douglas Helmmg and
Ms. Carrie Loya. The Applicant wiU be fimanciaUy responsible for aU negotiations and costs
*• associated with the implementation, monitoring, maintenance and protection of the mitigation
site defined ki this document.
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Proposed wetland mitigation/revegetation areas withki the project area shaU be accessible to the
* ACQE and CDFG throughout the project review and permittkig phase, as weU as during the
instaUation and five-year monitoring period.
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^ This plan was prepared by DUDEK staff serving as envkonmental consultants to the City of
Carlsbad. The representatives at DUDEK are Sherri L. Miller (Biologist), John L. Minchin
^ (Landscape Architect#2225/Habitat Restoration SpeciaUst), and Myloc Nguyen (Biologist/
Habitat Restoration Specialist).
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^ 1.4 Jurisdictional Areas Affected by the Project
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m A delkieation of "waters of the United States" and wetlands under the jurisdiction of the ACOE
was conducted for the project area between 1997 and 2000 by SEB, HELIX and DUDEK
^ biologists. The ACOE jurisdictional wetland delineation was conducted ki accordance with the
^ 1987 U.S. Army Corps ofEnginters WttlandDtlintationManual (TR Y-87-1); hydrology, vegetation,
and soils were examined at potential wetland sites. MunseU Soil Color Charts were used to
* determine soil chroma and value and the kidicator status of the plant species was determined by
* using the U.5. Fish and Wildlift Service National List of Plant Species that Occur in Wetlands:
^ California (Region 0). The extent of wetland features was determined in the field by stakkig,
g| surveykig, and using Global Positionkig System (GPS) equipment; these shapes were transferred
to the topographic base, and digitized into an ArcCAD file {Figure 3).
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The proposed project would include permanent impacts to 0.42 acre of southern willow scrub,
^ 0.27 acre of disturbed wetlands and 0.24 acre of unvegetated ephemeral waters of the U.S. within
li the proj ect site. Permanent knpacts to southern willow scrub and unvegetated ephemeral waters
of the U.S. would occur as a result of the fillkig and dredgmg for construction of abutments,
* bridge piers and a storm draki outfall stmcture associated with the repiacement of the bridge over
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li Conceptual Wetland Mitigation and Monitoring Plan - Rancho Santa Fe Road
Jurisdictional Impact Areas 1 and 2 and Onsite Revegetation
FIGURE
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
San Marcos Creek. Permanent knpacts to disturbed wetlands and unvegetated ephemeral waters
of the U.S. would be incurred as a result of the fiUkig and gradkig for construction of the roadway
and associated slopes (Figure 3).
Temporary knpacts to southern wiUow scrub, totalkig 0.97 acre, would occur as a result of the
demolition of the old bridge and replacement of the bridge over San Marcos Creek (Figure 3).
1.5 Functions and Values of Areas Affected by tfie Construction Worl(
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1.5.1 Water Quality Issues
Water quality withki San Marcos Creek could be affected by the realignment and widening of
Rancho Santa Fe Road, the bridge replacement over San Marcos Creek and proposed revegetation
program. Measures to avoid or mitigate knpacts to water quaUty have been mcorporated kito the
project design and include the foUowing:
• Construction Phase: During the construction phase, Best Management Practices (BMPs)
wiU be applied to control stormwater runoff and to provide sedknent and dust controL
These measures include:
Gravel berm, filter fabric fences, Unes of straw bales, to prevent erosion;
Surfacing of roadways wiU occur as soon as possible;
Project design wiU ensure that no additional runoff durkig constmction will drain
kito San Marcos Creek;
AU trash, debris, and refuse generated during gradkig will be contained and
removed;
Periodic watering of areas to rxiinimize dust;
- - Prompt revegetation of surrounding areas to prevent erosion;
When feasible, hauling by the developer wiU be accompUshed in a marmer that
mkiimizes the spiUage of soU onto roads ki developed areas;
Trash, debris and refuse material such as oil, grease, broken equipment and
construction trash generated during grading wiU be properly contained and
removed offsite to a disposal site;
The Bridge Replacement Final AUgnment Plans wiU adhere to recommendations
made by Dokken Engkieerkig in thek 2000 report entitled Structural Calculations
for Rancho Santa Fe Road Bridge Over San Marcos Creek regarding bridge
construction;
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
The Contractor wiU prepare and submit to the RWQCB a Stormwater PoUution
Prevention Plan (SWPPP) in accordance with the requirements of a constmction
activity permit; and
- - To minimize water quaUty degradation by sedimentation of the creek charmel
during constmction, construction of the new piers and demolition of existing piers
will be limited to the dry season (March to October).
• Operational Phase: The roadway design mcludes devices for storm water treatment.
These devices capture and treat the storm water prior to discharge to the creek. BMP's
wiU also be applied to reduce pollutant loads to the creek. These BMP's wiU include use
of rip-rap at storm drain outlets to reduce the velocity of runoff.
- - The City wiU follow aU recommendations made pertakikig to erosion control m the
geotechnical evaluation by Geocon, Inc., the Cityof Carlsbad's Gradkig, Clearmg and
Gmbbing PoUcy, Gradkig Ordmance, and the City's Landscape Manual.
1.5.2 Rare Or Endangered Species
No state- or federaUy- Usted rare, threatened or endangered species were observed onsite. Three
species recognized as locally sensitive (i.e., narrow endemic) by the California Native Plant Society
(Skinner and PavUk 1994) were detected and mapped onsite: southwestern spkiy rush (Juncus
acutus var. leopoldii), California adolphia {Adolphia californica) and San Diego golden-star {Muilla
clevelandii). A small population of southwestern spiny rush was observed withki San Marcos
Creek and could be affected by the instaUation of a temporary access road and construction of
bridge abutments (Figure 3). An undetermkied number of California adolphia and approximately
1,500 kidividuals of San Diego golden-stars would be permanently impacted by the proposed
project.
One wildlife species, California gnatcatcher (Polioptila californica) recognized as threatened by the
USFWS was not detected but could potentiaUy occur within the coastal sage scrub onsite. In
addition, the foUowing species recogrkzed as USFWS "sensitive species" and/or as "species of
mi special concern" by CDFG either occur or could potentiaUy occur witfm the proj ect area: Cooper's
H hawk (Accipiter cooperii), loggerhead shrike (Lanius ludovicianus), BeU's sage sparrow (Amphispiza
belli belli), southern CaUfomia mfous-crowned sparrow {Aimophila ruficeps canescens), two-striped
* gartersnake (Thamnophis hammondii), San Diego homed lizard {Phrynosoma coronatum blainvillei),
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
western spade-foot toad (Scaphiopus hammondii), coastal western whiptail (Cnemidophorus tigris
multiscutatus), red-diamond rattlesnake (Crotalus exsul), coastal rosy boa (Lichanura trivirgata
roseofusca), Dulzura California pocket mouse (Chaetodipuscalifornicus femoralis), northwestern San
Diego pocket mouse (Chaetodipus fallax fallax), San Diego desert woodrat (Neotoma lepida
intermedia) and San Diego black-tailed jackrabbit (Lepus californicus bennettii). Mitigation for
potential impacts to the species discussed above is addressed within the Biological Resources
Technical Rtport d2 Impact Analysis for the Rancho Santa Fe Road Realignment and Bridge Projtct,
prepared by DUDEK and dated April 2000.
1.5.3 Plant Communities/ Habitats
The wetlands within the proposed impact areas consist of southem wUlow scmb and disturbed
wetlands. Impacted habitats are shown ki Figurt 3. Descriptions of these plant communities/
habitats are provided below.
ACOE and CDFG ]urisdictiona! Areas
Southem Willow Scmb
(0.42 acre permanent unpact and 0.97 acre temporary impact)
HoUand (1986) describes southern wiUow scmb as "dense, broad-leafed, winter-deciduous riparian
m thickets dominated by several species of wiUows (Salix sp.), with scattered emergent Fremont
ig cottonwood (Populus frtmontH) and western sycamore (Platanus racemosa)" The understory is
usuaUy depauperate owing to the dense canopy.
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* The southern wiUow scrub habitat in San Marcos Creek was not bumed during the 1996 fke and
supports arroyo wiUow (Salix lasiolepis), western sycamore, Fremont cottonwood, rush (Juncus
ii spp.), wmged tfiree-square {Scirpus americanus), Mexican elderberry (Sambucus mexicanus), and
cattails (Typha sp.). Understory species ki the southem wiUow scrub habitat kiclude Califomia
mugwort {Artemisia douglasiana), curly dock (Rumtx crispus), yerba mansa {Antmopsis californica),
rigid hege-nettle (Stachys ajugoidts var. rigida), Mexican tea {Chenopodium ambrosioidts), and
poison-oak (Toxicodendron divtrsilobum). A total of 1.72 acres of southem wiUow scmb habitat was
M mapped by DUDEK {Figure 3).
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
Disturbed Wetlands
(0.27 acre permanent impact)
In general, the disturbed wetlands designation is used ki areas where hydrophytic vegetation,
significant hydrology and hydric soils are present and the plant community appears to be
disturbed. Disturbed wetlands are usuaUy dominated by herbaceous species such as English
ryegrass (Lolium multiflorum), rushes, curly dock and armual rabbit's foot grass (Polypogon
monspeliensis).
Within the proj ect area, disturbed wetlands occur in a shaUow drainage surrounded by bumed and
disturbed coastal sage scrub with some adjacent grasslands. Dominant species withki the
disturbed wetlands consist of EngUsh ryegrass, mshes, and curly dock. Disturbed wetlands
occupy 0.27 acre (Figure 3).
Unvegetated Effhemeral Waters ofthe U.S.
(0.24 acre permanent impact)
A total of 0.24 acre (3,890 Ikiear feet) of unvegetated ephemeral waters of the U.S. wiU be
permanently knpacted as a result of fiUing and gradkig activities between Questhaven Road and
La Costa Meadows Road.
1.5.4 Wildlife
WUdlife habitats present within the project area include riparian/wetland habitats and upland
habitats (Figure 3). WUdUfe habitats of greatest value are those that are (1) rare In San Diego
County, (2) highly productive, or (3) capable of supportmg sensitive species. The
vegetational/habitat diversity of the site, the large amount of "edge" habitat which provides
openings for wUdlife to forage ki and the existing wetland resources which provide water for both
upland and wetland wildlife species are expected to support a relatively rich native fauna. A
complete Ust of wUdlife species observed is attached as Appendix B of the Biological Resources
Technical Report cS^ Impact Analysis for the Rancho Santa Fe Road Realignment and Bridge Project. The
list includes wUdlife species which were detected before the Qctober 1996 fire but may no longer
be present due to the ioss of habitat and refuge resulting from the fke.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
A total of 84 species of bkds was observed during the wUdUfe surveys. The avifauna is comprised
of a moderately diverse assemblage of species associated with coastal sage scmb, along with
several species found more commonly in riparian habitats and grasslands. Habitats onsite
kicluding coastal sage scrub, southern mixed chaparral, armual grassland and riparian provide
habitat for a variety of bkds including the California towhee (Pipilo crissalis), spotted towhee (P.
erythrophthalmus), CaUfornia thrasher (Toxostoma redivivum), mourning dove {Zenaida macroura),
bushtit (Psahriparus minimus), wrentit (Chamaea fasciata), house finch (Carpodacus mexicanus),
black phoebe (Sayornis nigricans), and European starling (Sturnus vulgaris). Red-taUed hawk (Buteo
jamaicensis) and Cooper's hawk were observed foragmg m the riparian area.
A total of nkie species of reptUes was observed onsite. Common reptUe species occuring ki the
area mclude southern aUigator lizard (Gerrhonotus multicarinatus), side-blotched Uzard (JJta
stansburiana), western fence lizard (Sceloporus occidentalis), whiptaUs (Cnemidophorus spp.), gopher
snake (Pituophis mtlanoleucus) and rattlesnakes (Crotalus spp.).
A total of three amphibian species was observed ki the riparian area: CaUfornia treefrog (Hyla
cadaverina). Pacific treefrog (Pseudacris hyla regilla)and buUfrog (Rana catesbeiana).
A total of fourteen species of mammals was observed onsite. Common mammal species occuring
m the area kiclude rabbits (Sylvilagus spp.), striped skunk (Mephitis mephitis), deer mouse
(Peromyscus maniculatus), Dulzura Califorrua pocket mouse (Chaetodipus californicus femoralis), mule
deer (Odocoileus hemionus), coyote (Canis latrans), gray fox (Urocyon cinereoargenttus), and Pacific
kangaroo rat (Dipodomyus agilis), woodrats (Neotoma spp.) and harvest mouse {Reithrodontomuys
mtgalotis).
A total of 24 invertebrates was observed onsite. Common invertebrate species occurring in the
area include funereal duskywing (Erynnis funtralis), westem checkered skipper (Pyrgus albens),
swaUowtaUs (Papilio spp.), Behr's metaUnark (Apodemia mormo virguiti), West coast lady (Vannessa
annabella), painted lady (V. cardui) and common white {Pontia protodice).
^ 1.6 Impacts to Jurisdictional Areas
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DUDEK has determkied, uskig ArcCAD to overlay the proposed project footprint over the
jurisdictional areas, that a total of 0.93 acre of southem wiUow scmb, disturbed wetlands and
unvegetated waters of the U.S. under the jurisdiction of ACOE and CDFG wiU be permanently
impacted by the implementation of the proposed project. In addition, 0.97 acre of southem
wiUow scrub under the jurisdiction of ACOE and CDFG wUl be temporarUy impacted. See Table
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
i for a summary of aU impacts to jurisdictional areas associated with the implementation of the
proposed project and the resultant preserved wetland acreages.
TABLE 1. ACREAGE IMPACTS TO JURISDICTIONAL AREAS
FOR THE PROPOSED PROJECT
(Rancho Santa Fe Road Impact Area)
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Pemiamiit Impacts Temporary Impacts Remaining Acreages
Habitat Type Existing Acres (Acres) (Acres) after Impacts
Southem willow scrub 1.72 0.42 0.97 0.33
Distuited wetlands 0.27 0.27 0 0
Unvegetated waters 0.45 0.24 0.21 0
TOTAL 2.44 0.93 1.18 0.33
2.0 WETLAND l\/IITIGATION PROGRAM
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2.1 Goal of Mitigation
The maki goal of the wetland mitigation program is to mitigate for the permanent and
temporary impacts to wetland habitats within San Marcos Creek through offsite and onsite
revegetation efforts. Mitigation for permanent impacts to southem wiUow scrub and disturbed
wetland composed of freshwater marsh consists of offsite creation, at a ratio of 3:1, of 1.26 acres
of southem wUlow scrub; offsite creation, at ratio of 1:1, of 0.27 acre of freshwater marsh; and
offsite enhancement, at a ratio of 2:1, of 0.54 acre of freshwater marsh habitat. Mitigation for
permanent impacts to unvegetated ephemeral waters of the U. S. consists of offsite creation, at
a ratio of 1:1, of 0.24 acre of freshwater marsh. Additional proposed mitigation for temporary
impacts to southern wUlow scmb consists of onsite restoration, at a ratio of 1:1, of 0.54 acre of
southem wUlow scrub. The balance (0.43 acre) of the southern wiUow scrub habitat at the
temporarUy knpacted stream charmel wUl be mitigated offsite through creation, at a ratio of 1:1,
of 0.43 acre of southern wiUow scrub and enhancement, at a ratio of 2:1, of 0.86 acre of southern
wiUow scrub.
In total, 3.09 acres of southem wUlow scrub and 1.05 acres of freshwater marsh creation,
enhancement and restoration wUl be provided. Mitigation acreage to be provided wiU thus total
approximately 4.14 acres of wetland habitat credit. Table 2 shows the summarized permanent
and temporary impact quantities for the proposed project as weU as nutigation ratios and
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
nutigation requkements. Figure 6 iUustrates the prelkninary revegetation scheme for the proposed
mitigation site.
TABLE 2
MITIGATION SUMMARY FOR PERMANENT AND TEMPORARY IMPACTS
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Required Mitigation
m Required Mitigatiim Ratio (Acres) Total Proposed
m Impacts * Onsite Mitigation
Habitat Type (Acrsi) Creation Enhancement Restoration Creation Enhancement Restoration (Acres)
m Permanent Impacts*
m Southern willow
scrub
0.42 3:1 --1.28 - -1.26
m Disturbed wetlands 0.27 1:1 2:1 -0.27 0.54 -0.71'**
m Waters of the U.S. 0.24 1:1 --D.24 --0.24***
Temporary Impacts*"
m Southem Willow 0.97
m Scrub
onsite nutigation 0.54 - -1:1 - -0.54 0.54
m offsite mitigation 0.43 1:1 2:1 -0.43 0.86 -1.29
k Totals bvundad) U 1 2.2 tj40 0.54 4.14
• Permanent impacts resulting from the Rancho Santa Fe filling and grading.
• • Temporaiy impacts being compensated for through onsite restoration of temporary disturbance locations following completion of construction
and additional creation/enhancement acreage at the offsite locatioiL
**• Mitigation aaeage for impact to disturbed wetlands and waters of the U.S. will be compensated for with freshwater marsh creation and
enhancement offsite.
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2.1.1 Types of Habitat to be Created
The mitigation program proposes to provide revegetation of 4.14 acres of wetland habitats
through creation, enhancement and restoration of southern wiUow scmb and freshwater marsh,
both onsite and offsite. The proposed revegetation program wiU include 2.2 acres of creation, 1.40
acres of enhancement, and 0.54 acre of restoration of southem wUlow scrub and freshwater marsh
habitats. The creation and enhancement of southern wUlow scmb and freshwater marsh habitats
wUl occur offsite, while the restoration of temporarUy disturbed southem wUlow scmb habitat
wiU occur onsite (Figure 3). The proposed areas of wetland habitat creation wiU occur withki non-
native upland habitats adjacent to riparian vegetation which wUl be excavated to proper
elevations to support the kitended habitats (Figure 4). The southern wUlow scmb and freshwater
marsh enhancement areas wUl occur withki patches of existkig southern wUiow scrub habitat and
DUDEK & ASSOCIATES, INC.
1576-9
Profaiimud Teams for ComptaPr^ieU December 2000 13
ftl ftl WiM 1k..M ftl ftl ri II ftl ftl 11 11 Kl 11 1 ftl i I 11 i I
..: l-^^li'^'-'il' ' \ j^lfiA\^A'i:!iy--"--
•'^v^ Ownership Boundaiy
TMl = Brookfield/Brouwer
TM2 = CIC
TM3 = Shelley
BASE TOPO SOURCE: O'DAY CONSULTANTS
Sc^a in Feet
Conceptual Wetland Mitigation and Monitoring Plan - Rancho Santa Fe Road
Biological Resources Map • University Commons Area
FIGURE
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
freshwater marsh habitat that contain an abundance of exotic/weedy species such as eucalyptus
(Eucalyptus sp.) trees, pampas grass (Cortaderia selloana), ^ant reed (Arundodonax) and other weed
species (Figure 5). Also, the proposed enhancement areas wiU be located adjacent to the southern
wUlow scrub creation area, as weU as existmg freshwater marsh patches; therefore, the
enhancement program wiU help decrease exotic/weed invasion within the newly created wetland
habitat as weU as within the existing wetland habitat. The proposed restoration of 0.54 acre of
southern wiUow scrub habitat wUl occur onsite witiun the area of temporary impact resulting
from bridge constmction.
The mitigation/revegetation plant palettes have been designed to include a composition of species
simUar to existing and adjacent natural areas. Tables 3 through 6 show the intended species
compositions, the anticipated spacings on center, the size for kiitial plantings from container
stock, and the intended plant species from seed for creation, enhancement and restoration of
southern wUlow scrub and freshwater marsh habitats within the mitigation areas.
The created, enhanced and restored wetland habitats ultimately are expected to have higher
functions and vadues than the existing habitats to be impacted, through the expansion of the
riparian corridor, the enhancement of degraded wetlands, and the replacement of existing non-
native habitat with native habitat. The mtent of the revegetation program is to encourage the
natural restoration process as weU as to create and enhance wetland habitat by removing non-
native exotic species. This wUl help estabUsh appropriate native plant assemblages which wUl
further develop over time kito the intended plant communities.
2.1.2 Functions and Values of Habitat to be Created
The created, enhanced and restored wetland areas are ultknately expected to expand upon the
existing riparian habitat and become a functioning part of the riparian system. The intended
revegetation program wUl encourage the natural restoration process by helping to remove and
control non-native exotic weed species and wUl support the development of appropriate native
plant habkats.
The proposed revegetation areas are located immediately adj acent to existkig riparian vegetation
or are ki upland areas which can be marupulated through excavation to create appropriate
wetland conditions. In addition, degraded wetland areas would be improved and enhanced
through removal of exotics and revegetation. Thus, through site grading to lower elevations for
k better water table relationships, appropriate ecological conditions wUl be created to help support
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HW^ Herbaceous Wetland
OC ^ Open Channel
KQW| Open Water
/ Ownership Boundaiy
TMl = Brookfield/Brouwer
TM2 = ac
TM3 = Shelley
BASE TOPO SOURCE: O'DAV CONSULTANTS
Offsite Rancho Santa Fe Rd.
Mitigation Area (See figure 6)
Scale kl Feet
Conceptual Wetland Mitigation and Monitoring Plan • Rancho Santa Fe Road
Jurisdictional Delineation Map - University Commons Area (with Offsite Revegetation Site)
FIGURE
5
Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
TABLE 3. RECOMMENDED CONTAINER PLANTS AND SEED MDC FOR
SOUTHERN WILLOW SCRUB REVEGETATION
(1.69 acres offsite creation) (Assumes 100% cover)
Spacing on Approx.
mm BotanicallComnwn Name Container Size Convosition Center Quantitv
m Trees (overstonrKassumes 100% overstary cover)
Plataim raceimsa - western svcamore Igai. 10% 25 ft. 12
mm SaSxIask)!^ - arroyo wAw** IgaL 50% 12 ft. 256
m S^gooddm^ - black wiHow** IgaL 30% 15 ft. 98
SanAucus mexicanus - Mexican elderberry Igai-10% 12ft. 51
SiAtotat 417
m Shrubs (understoryXassunes 100% understory cover)
Iftft
Artemisia painefi - San Diego sagewort Igai. 10% 3 ft. 818
Baccharis saScifoia - mule fat Igai. 30% 6 ft. 613
m fvahayesma - San Diego marsh elder Igai. 10% 4 ft. 460
*tm Jmctis acutus - s|wiy rush Igai. 10% Sft. 115
Pkic/t^ odorata - salt marsh fleabane IgaL 15% 8ft. 173
m Rosa caSforma - CaSfomia wid rose IgaL 15% 6 ft. 307
Rubus arsmus - Ci\\forma blackberry IgaL 10% Sft. 294
SiAtotat Z780
*•
Total 3,197
Hydroseed Mix "%P/%G Us/Ac.
m Ambmsia p^ostachya • westem ragweed 2/30 2
Artemisia douglamia • mugwort 10/50 6
mm Artemisia pabmi • San Oiego sagewort 15/50 4
m Isocoma menmsi • coast goUenbush 98/75 2
Iva hayesiana - San Diego marsh elder 35/20 6
0m Lotus atf^arm • deerweed 90/60 4
m li^ms iKcohr • pygmy-lsaved lupine 98/80 2
f^hea odorata • marsh fleabane 35/60 4
Total Lbs. Per Acre 30 lbs.
%P/%G • Minimum percentage purity and percentage gennmation for acceptable seed quafity.
Local collection of propagules from tha San Oiego County region will be required as the source for these species.
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TABLE 4. RECOMMENDED CONTAINER PLANTS AND SEED MIX FOR
FRESHWATER MARSH REVEGETATION
(0.51 acre offsite creation) (Assumes 100% cover)
m Container Spacing Approx.
Botanical/Common Name Size Composition on Center Quantity
mm Ammof^is californica - Yerba mansa Igal. 10% 2 ft. 555
m Eleocharis macrostachya - pale spike-sedge 6" pot 10% 1ft. 2,222
m Juncus acutus - southwestem spiny rush Igal. 10% 4 ft. 139
Juncus hufonius - toad rush 6" pot 10% 1ft. 2,222
m Scirf^us americanus- Olney's bulrush Igal. 30% 2 ft. 1,666
m Scirf?us californicus - Califomia bulmsh Igal. 30% 3 ft. 741
m Total 7,545
m TABLE 5. RECOMMENDED CONTAINER PLANTS AND SEED MIX FOR
SOUTHERN WILLOW SCRUB ENHANCEMENT
mm (0.86 acre of offsite enhancement)
Container Spacing Approx.
Botanical/Common Name Size Composition on Center Quantitv
mm Trees (overstoiy) (assumes 70% overstory cover due to existing vegetation to be present)
Platanus racemosa - westem sycamore Igal. 5% 25 ft. 3
Salix lasiolepis - arroyo willow*' Igal-40% 12 ft. 104
Salix gooddingii - black willow* * Igal. 20% 15 ft. 33
Ml Sambucus mexicanus - Mexican elderberry Igal. 5% 12 ft. 13
Suhtotat
Shrubs (understory) (assumes 50% understory cover)
m Baccharis salicifolia ~ mule fat Igal. 30% 12 ft. 78
Iva hayesiana - San Diego marsh elder Igal. 10% Sft. 59
m Juncus acutus - spiny msh Igal. 10% 16 ft. 15
m Suirtotat iSZ
Total 305
m Hydroseed Mix (for ail bare areas) *%P/%G Lbs/Ac.
Itf Ambrosia psilostachya - westem ragweed 2/30 2
m Artemisia douglasiana - mugwort 10/50 6
Anemisia palmeri - San Diego sagewort 15/50 4
Isocoma menziesii - coast goldenbush 98/75 2
Iva hayesiana - San Diego marsh elder 35/20 6
il Lotus scoparius - deerweed 90/60 4
Lupinus bicolor - pygmy-leaved lupine 98/80 2
m Pluchea odorata - marsh fleabane 35/60 4
Total Lbs. Per Acre 30 Ibs.
%P/%G - Minimum percentage purity and percentage germination for acceptable seed quality.
* Local collection of propagules from the San Diego County region wiU be required as the source for these species.
DUDEK & ASSOCIATES, INC.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
TABLE 6
RECOMMENDED SEED MJX FOR RESTORATION OF WETLAND HABITATS
(0.54 acre of onsite restoration)
m Hydroseed Mbc (Apply to all bare/disturbed areas) *%P/%G Lbs/Ac.
Ambrosia psilostachya - westem ragweed 2/30 2
Anemisia douglasiana - mugwort 10/50 6
m Artemisia palmeri - San Diego sagewort 15/50 4
Isocoma menziesii - coast goldenbush 98/75 2
m Iva hayesiana - San Diego marsh elder 35/20 6
m Lotus scoparius - deerweed 90/60 4
Lupinus bicolor - pygmy-leaved lupine 98/80 2
m Pluchea odorata - marsh fleabane 35/60 4
m Total Lbs. Per Acre 30 lbs.
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the establishment of the intended wetland species and expansion of the riparian zone. The
southem wiUow scrub and freshwater marsh revegetation areas are expected to be fairly well-
developed by the end of the five-year maintenance and monitoring period due to their extremely
fast growth rate.
Throughout the project, conversion of degraded uplands to wetlands^ removal of exotics/weeds
from existing wetlands^ expansion of wetland resources and genetic continuity of plant materials
through the revegetation effort wUl be unportant goals of the overaU mitigation program and
should lead to improved functions and values for the overaU riparian system. Additional
container plantings and seed appUcations of appropriate native understory shrub and herbaceous
species wiU help stabUize the surface soUs and wUl help improve long-term habitat diversity
through understory plant development.
Mitigation for unpacts to wetlands wiU include replanting with native plant associations utiUzing
appropriate native species for the intended plant communities. The mitigation habitats have
been designed to provide a mixture of tree, shrub and herbaceous groundcover species to achieve
both overstory and understory compositions simUar to adjacent undisturbed natural areas.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
The revegetation effort wUl coimect and expand existmg patches of native habitat and wUl
enhance v^dldUfe habitat use along the riparian corridor by providmg increased plant cover and
protection. An added benefit of the revegetation program wiU be the eradication of non-
native/exotic plant species and weeds from the native habitats to be preserved. The eradication
program wiU be implemented during the revegetation site preparation procedures and wiU
continue durmg the long-term mamtenance period.
2.1.3 Time l^pse
It is Ukely that the southern wUlow scrub creation and enhancement areas require 10 to 15
years or longer to approach the general structure, height, and canopy cover of a mature riparian
habitat. However, within five years the Uitended native plant material compositions should be
established enough to survive under natural conditions and to have adequate coverage to help
minimize uivasion of exotic species. By the end of the five-year maintenance and monitoruig
period, it should be apparent whether the revegetation efforts have been successful and have lead
to a self-sustaUmg habitat.
The freshwater marsh creation and enhancement areas should be weU-established by the end of
the third year of the monitoring program.
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m 2.1.4 Cost Estimate
It is estimated that the uiitial cost for mstaUation and initial mauitenance of the
mitigation/revegetation effort for the 4.14 acres of wetland habitats required both onsite and
m offsitewiUcostapproxunately$192,500. This cost amounts to approxunately $46,500/acre. This
m cost estunate includes site preparation, grading, plantuig, temporary irrigation and maintenance
through the end of the initial 120-day estabUshment period (instaUing contractor responsibUity
including irutial revegetation mauitenance through the 120-day period). Revegetation
construction monitoring would cost approximately $10,800 through instaUation and the 120-day
m plant establishment period. Long-term mauitenance and biological monitoruig costs for the five-
iM year period total approximately $81,000 (responsibUity of the City of Carlsbad). The cost of
monitoruig and long-term mauitenance would be approxunately $22,000/acre. The total cost for
the entire program wUl be $284,300 or approxunately $68,700/acre through the entire five-year
period. These costs indude a 20 percent contingency factor for unforeseen costs as required by
the resource agencies. These costs do not include the purchase price or other charges associated
with acquisition of the offsite mitigation areas.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
2.2 Final Success Criteria
The final success criteria outimed herein wUl be used to determine completion of the Applicant's
mitigation responsibiUties. Fulfillment of these criteria shaU demonstrate that the mitigation
areas are progressuig toward the habitat types, functions and values which wUl fulfUl the long-
term goals of the mitigation effort. Success criteria wUl not be considered to have been met untU
aU artificial support has ceased (e.g., supplemental irrigation has been terminated for a minunum
of two years, container plant replacement complete, etc.), there is evidence of natural native plant
recruitment, and the designated five-year mauitenance/monitoring period has been successfuUy
^ completed with approval of the resource agencies. See Section 3.1 for specific performance
^ standards.
^ 2.2.1 Existinq Functions and Values of IVIitigation Area
m The proposed offsite mitigation area is currently composed of wetland habitats includuig
li southem wiUow scrub, mule fat scmb, freshwater marsh and open water of varying degrees of
disturbance and patch size and with significant amounts of exotic species invasion. The
immediate creek area likely forms a corridor for dispersal of wUdlife species downstream to the
west ofthe project area. Adjacent to the existing wetland vegetation vvithui proposed mitigation
areas, annual grassland and disturbed habitat exists providing Umited habitat value. Due to the
non-native species invasion of armual grassland and disturbed habitats, the existing functions and
values of these upland areas serve primarUy as foraging and nestuig habitat for raptors and habitat
for various wUdlife. The habitat to be created wUl improve the functions and values of the
existing site by replacing low quality non-native habitat with higher quaUty native habitat and
m reintroducing appropriate native overstory and understory species. These lower quaUty habitats
ii wiU be replaced with higher quality southem wUlow scrub and freshwater marsh habitats. The
^ majority of the existuig patches of wetland habitat wUl be left intact and/or enhanced with
^ connections re-estabUshed to provide a more cohesive habitat.
m The mitigation areas, through expansion of the riparian zone, should provide uicreased benefits
ii to native wUdlife. Expanding the riparian zone wUl provide increased benefits to native wUdUfe
by providing additional buffering effects from the adjacent development, mcreasing habitat
diversity and increasuig foraguig opportunities. The existing disturbed habitats in their current
condition actuaUy discourage native plant recolonization because of the level of disturbance adn
the presence of the exotics which tend to out-compete the native species.
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Rancho Santa Fe Road Realignment and Bridge Replacement Project
2.2.2 Target Functions and Values
The long-term goal of the revegetation effort is to create a self-sustainuig riparian system
composed of southern wiUow scrub and freshwater marsh habitats. The mitigation project
should ultunately create habitats with appropriate native plant assemblages suitable for animal
foraguig, nestuig and dispersal that are of better quality than the existing conditions of the site.
The proposed mitigation site wiU provide uicreased habitat cover and buffer areas for wUdlife
movement.
The created and enhanced habitats are expected to develop ui successlonal stages, even though
an appropriate quantity of native plant materials wiU be mstaUed initiaUy. Overstory and
understory species are expected to substantiaUy estabUsh vvithin the uiitial five-year period to
levels which should be self sustaining over the long term.
Within the southern VTUIOW scrub areas, the wiUow trees are expected to reach approxunately 70
percent of their ultimate overstory cover by the end of the five-year mauitenance/monitoring
period. Understory shrub and ground cover species in the southern wiUow scrub areas should
reach 80 percent of their intended coverage withui the initial five-year period.
The freshwater marsh areas are expected to develop quicker than the southern wUlow scrub areas
il if sufficient wet conditions can be created/sustauied to encourage the growth. Adequate
establishment is anticipated by the end of the third year. Natural recruitment of native
freshwater marsh species is also anticipated during this period. CattaUs (Typha latifolia) typicaUy
colonize freshwater marsh areas on theu own without being planted. Other species are Ukely to
establish on their own from wind blown seed, wUdlife dispersal and through water-born seed.
2.2.3 Taroet Hydrological Regime
The hydrological conditions within the San Marcos Creek wUl not be altered from the current
m conditions due to unplementation of the proposed project. Development of the surrounding
k watershed wiU affect the amount of water flow entering the drainage. As part of the proposed
project, storm drains wiU be placed to drain under the roadway fiUs at the wetland impact
locations and wUl help sustaui the remauiing southem wUlow scrub and freshwater marsh
vegetation.
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Rancho Santa Fe Road Realignment and Bridge Replacement Project
Regarduig the offsite mitigation area, it is envisioned that the mcrease in development m the
surrounding areas (e.g.. University Commons) wiU lead to additional runoff in the drainages
flowuig through the revegetation areas. This factor coupled with the excavation of the upland
areas to lower elevations closer to avaUable groundwater should help sustaui the intended
revegetation effort over the long term. The widening of the riparian corridor and excavation of
upland areas to wetland elevations should help accommodate additional creek flow.
2.2.4 Target Jurisdictional Acreage to be Created and Enlianced
The goal of the mitigatiorVrevegetation plan is to revegetate a total of 4.14 acres of wetland
habitat includuig 2.2 acres of offsite creation, 1.40 acres of offsite enhancement and 0.54 acre of
onsite restoration of jurisdictional wetland habitat. The offsite wetland creation and
enhancement areas wUl be set aside in permanent open space as part of the University Commons
proj ect (part of Fieldstone HCP) Umiting future use of the areas and preserving them ui perpetuity.
2.3 Proposed Mitigation Areas
The proposed offsite mitigation areas are located along San Marcos Creek in the City of San
Marcos, withui the University Commons Specific Plan area. The University Commons project
was approved by the City of San Marcos in February 1991. Approvals included a specific plan,
tentative map and development agreement. The majority of the specific plan area is currently
owned by Brookfield Homes who is currently processing amendments to the existing entitlements
withui the City of San Marcos. The offsite mitigation site described in this conceptual mitigation
plan is within the Brookfield/Brouwer ownership portion of the specific plan area. As part of
preparation of this conceptual mitigation plan, representatives of the City of Carlsbad have met
with representatives of Brookfield Homes to discuss locating the mitigation site withui the
Brookfield/Brouwer ownership and Brookfield Homes representatives have conceptuaUy agreed
to the proposed mitigation site configuration and location (pers. comm., December 4, 2000, D.
Poole, Brookfield Homes). The City of Carlsbad and Brookfield Homes wiU continue to
m coordkiate development and mitigation plannuig associated with the Rancho Santa Fe Road and
il University Commons proj ects. Ongoing coordination efforts wUl mclude design and planning for
the implementation, maintenance and monitoring of the wetland mitigation site(s).
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2.3.1 Location and Size of Mitigation Areas
The proposed offsite mitigation and revegetation areas, totaUng 3.6 acres, are situated along San
Marcos Creek south and east of the Rancho Santa Fe ReaUgnment and Bridge Replacement
Project site. The proposed mitigation areas are located on either side of San Marcos Creek and
east of the La Costa Meadows Busuiess Park. The mitigation sites wUl be located east of the
future extension of Melrose Drive which wiU be buUt with the University Commons project.
Vegetation along San Marcos Creek is domuiated by southern wiUow scrub, mule fat scrub,
freshwater marsh, aimual (non-native) grassland and disturbed habitat. The creation acreage wUl
occur within non-native upland areas composed of annual grassland and disturbed habitat (Figure
4). Southern wiUow scrub and freshwater marsh enhancement areas are located adjacent to
creation areas and contain exotic/weedy plant species that would potentiaUy cause weed uivasion
(Figure 6). Therefore, these areas were targeted for enhancement to improve the overaU quality
of the habitat and to help assure success withui the creation areas (Figure 7). Plantings in these
areas wiU be uistaUed during the winter and early spruig periods to take advantage of natural
ramfaU and to minimize supplemental irrigation needs. Ongoing maintenance, weed control and
exotic plant removals wUl be mcluded for these areas in the five-year maintenance program.
Additional recmitment and colonization of native species wUl be encouraged.
m 2.3.2 Present and Proposed Uses of Mitigation Area
k
At present, the proposed wetland creation areas consist of upland habitats including non-native
armual grassland and disturbed habitat. The proposed wetland enhancement areas contain
existing southern wiUow scrub, mule fat scmb and freshwater marsh wetland species. The
m proposed mitigation/revegetation areas wiU provide uicreased wUdUfe habitat and expand native
k wetland habitats. Additional native vegetation wiU help provide additional foraging opportunities
^ and native plant cover for wUdUfe species utiUzuig the riparian areas.
ii
The offsite mitigation site for the Rancho Santa Fe Road project is located entirely within the
« Brouwer portion of the Brookfield/Brouwer ovmership. Brookfield Homes intends to convey the
• portion of the Brouwer ownership east of the future extension of Melrose Drive, the area withui
which the mitigation site is located, in fee title to the Environmental Trust for long-term
morutoring and management. To ensure that the wetland mitigation program is appropriately
implemented and monitored, easements wiU be granted to the City of Carlsbad and Brookfield
^ Homes for unplementation and monitoring of the mitigation program. An open space easement
k
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Conceptual Wetland Mitigation and Monitoring Plan - Rancho Santa Fe Road
Revised Conceptual Revegetation Plan (Offsite Location at University Commons)
FIGURE
6
u
Photo 1: Northeast facing view of existing southern willow scrub. Photo 2: North facing view of existing southern willow scrub. Photo 3: Northeast facing view of the open channel.
Photo 4: Southwest facing view of the open channel and existing
southern willow scrub.
Photo 5: Northeast facing view of proposed wetland mitigation site.
Conceptual Wetland Mitigation and Monitoring Plan • Ranclio Santa Fe Road
Site Photographs
FIGURE
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Conceptual Wedand Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
covering the entue Brouwer ownership, east of the future extension of Mekose Drive, wUl be
granted to the City of San Marcos to ensure the long-term conservation of the property, includuig
the wetland mitigation/revegetation sites.
2.4 Implementation Plan
The foUowing plan describes the necessary unplementation measures for creatuig and enhancing
the rntended habitats and unplementing the uitended mitigation and revegetation program.
2.4.1 Rationale for Expecting Implementation Success
The areas to be revegetated are unmediately adjacent to existmg riparian habitat, mdicating
appropriate conditions exist to support these wetland species if grade alteration and weed
eradication can be completed. Graduig wUl be conducted to create appropriate elevations for
expanduig the riparian habitat. The surrounding native habitat species compositions were used
as reference for the revegetation habitat compositions. HeavUy invasive non-native and exotic
species that have displaced desirable native species within the revegetation areas wUl be removed.
The intent is to help create more naturaUy diverse native habitats that wUl be able to muumize
exotic and weed invasions. Where appropriate, native plant materials grown from sources
coUected from the local coastal San Diego area wUl be used tn order to preserve genetic integrity
and uicrease the potential for long-term success and sustainabUity.
Because areas adjacent to the proposed revegetation areas presently support wetland species, the
probabUity of successful revegetation of the uitended habitat types based upon the estabUshment
of simUar elevations and hydrological conditions onsite is high. The surface hydrology and
groundwater conditions appear to be appropriate, if modifications through excavation to estabUsh
appropriate water table elevations can be made to support successful growth and sustainabUity
of the various vegetation types. The soUs may have to be manipulated through excavations and
possibly supplemented with soU amendments in order to encourage the revegetation program and
m optimize plant growth.
m
^1
il
m As part of the final landscape/revegetation construction documents (plans and specifications), to
be prepared at a later date by a Landscape Architect/Habitat Restoration Designer, soU
preparation recommendations wUl be provided based upon soUs analyses taken from the proposed
revegetation areas. Final soU sampling and additionai analyses also wUl be required of the
contractor after grading to verify soU fertUity and agricultural suitabiUty recommendations prior
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
m
m
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m
to plantmg. This uiformation wUl be utUized to estabUsh final soU amending/conditioning
measures as necessary to correct poor soU conditions and to aUow for successful contauier
plantuigs and seeduig. Amenduig of the soU backfiU for contauier plants may be necessary to
correct deficient soU conditions if they exist in the areas proposed for planting. To the greatest
extent possible, the revegetation effort has been focused in aUuvial soU deposits where a more
fertUe soU profUe is present. Implementation procedures wUl be outlined further ui subsequent
sections and on the final revegetation plans and specifications.
2.4.2 Preliminap/ Schedule
The revegetation program which provides mitigation for permanent and temporary impacts is
contuigent upon the approval of this conceptual wetland mitigation plan by the resource agencies
and local jurisdictions. Upon appropriate approvals, the implementation of the revegetation
program could begin in the winter of 2001.
Implementation Tasks Schedule
in
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Contract growing agreement with nursery
OveraU mitigation site graduig
Site Preparation and weed/exotic removal
InstaUation of temporary irrigation system
Planting container stock
Hydroseed application
Completion of InstaUation/Assessment of
revegetation effort
Year 1 monitoring Spring and faU of year
Year 2 monitoring
Year 2 remedial efforts (if required)
Year 3 monitoring
Year 3 remedial efforts (if required)
Year 4 monitoruig
Year 4 remedial efforts (if required)
Year 5 monitoring
Year 5 remedial efforts (if required)
Final Sign-Off
No later than nuie months prior to plantmg
Summer/FaU of implementation year
Fall/Winter foUowuig grading
Winter/Spring foUowing site preparation
Spruig foUovidng irrigation instaUation
Spruig foUowing plantmg
FaU foUovmig completion of construction and
120 day maintenance period
one foUowing completion of instaUation phase
Spruig and FaU of foUowing year
Spring/Summer of foUowuig year
Spring and FaU of foUowing year
Spring/Summer of foUowing year
Spring and FaU of foUowuig year
Spruig/Summer of foUowuig year
Spring and FaU of foUowing year
Spring/summer of foUowing year
FaU/Winter of Year 5
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Conceptual Wedand Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
2.4.3 Site Preparation
The initial site preparation effort necessary to prepare the revegetation areas wiU include the
removal of aU non-native weed and exotic species from the limits of the creation, enhancement
and restoration areas, including but not limited to eucalyptus trees (Eucalyptus ssp.), pampas
grass, pampas grass^ salt cedar (Tamarixramosissima), sweet fennel (Foeniculum vulgare), artichoke
thistle {Cynara cardunculus), sweet clover (JVlelilotus sp), bristly ox-tongue (Pieris echioides), black
mustard (Brassica nigra), castor bean (Ricinus communis), tree tobacco (Nicotianaglauca), cocklebur
(Xanthium sp.)and other uivasive exotics from the limits of the mitigation areas. AU eucalyptus,
salt cedar, giant reed and other highly invasive/exotic species, as identified in Sections 2.5. id and
2.5.2 and as tagged by the biological monitor/habitat restoration specialist, shaU be physicaUy
removed and/or cut down and treated with an herbicide, where necessary, and removed from the
" site. Remauiuig trunks shaU be treated with a stump kiUer and periodicaUy sprayed with an
*" herbicide to help controi re-sprouts. Although not within the unmediate mitigation areas, the
mm physical/mechanical removal of any giant reed rootbaUs and aU associated cut vegetation may be
m necessary if giant reed colonizes the area duruig the maintenance period. AU cut vegetation from
giant reed wUl be disposed of at an acceptable off-site source or landfiU facUity. Any giant reed
*" clumps which are intertwined vdthin existing native vegetation, which would preclude
mechanical removal, shaU be cut back to the rootball by hand and sprayed with an acceptable
m herbicide as specified by a Licensed Pest Control Advisor.
m
If tree removal occurs during the migratory bird nesting season, a focused avian nestuig survey
* shaU be performed by a qualified wUdUfe biologist two days prior to tree removal in accordance
with the Migratory Bird Treaty Act (16 U.S.C. 703-712). T3^icaUy, birds ui southem CaUfornia
Ml nest between March 15 and August 31. Results shaU be documented m writing and forwarded
M to the permittuig agencies. If nesting birds are detected, the vegetation within the nest location
shaU be protected untU fledging has occurred.
ii
m
In order to create appropriate wetland habitat, the revegetation areas wiU be excavated to
plantmg levels compatible with the existing vegetation and/or within reasonable distance to
groundwater elevations. Finai grading plans for the revegetation areas wUl be prepared by the
proj ect civU enguieer in coorduiation with the Landscape Architect/Habitat restoration specialist
based on the intent of this conceptual mitigation plan. Wetland grading plans for the
revegetation areas shaU be incorporated into the final project gradmg plans or revegetation
landscape plans.
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Conceptual Wetiand Mitigation and Monitoring Plan
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Fuial soUs analyses shaU be initiated by the contractor after rough grading of the revegetation
areas is completed to verify whether additional soU remediation measures (i.e., amending/
conditioning) wiU be necessary. This wiU include representative soU sample analyses, completed
by a soUs testing laboratory, from each of the uitended revegetation areas to determuie
agricultural- suitabUity and soU fertiUty. Recommendations shaU be provided on the final
landscape plans (plans and specifications) for soU amending if necessary. SoU augering of the
container plant pits for tree species wUl also be required to help faciUtate roots reachuig the
avaUable water table.
2.4.4 Final Landscape/Revegetation Plans
A final set of landscape construction documents (plans and specifications) including planting
plans, irrigation plans, uistaUation detaUs and specifications (instaUation and maintenance
requirements) shaU be prepared by a Landscape Architect/Habitat Restoration Designer. The
plans shaU be acceptable for bidding and shaU be prepared to implement the conceptual guidelines
for the revegetation program outlined in this document. Implementation of the revegetation
program must be coordmated among the AppUcant, Landscape Architect/Habitat restoration
specialist, landscape contractor and plant material suppliers. The contracting nursery and seed
coUectors should be given the maxunum possible lead tune (i.e., no less than mne months prior
to actual planting instaUation) to complete special coUections and prepare plant materiai for the
project in order to assure avaUabUity and to minunize cost. Field coordination shaU be provided
by the biological monitor/landscape architect for construction of the mitigation/revegetation
areas.
Species to be planted in the revegetation areas are shown on the plant palette Tables 3 through 6,
which indudes the revegetation plant materials and seed for the proposed project. The conceptual
revegetation areas are graphicaUy depicted on Figure 6.
The nursery that provides plant materials should be contacted immediately foUowing approval
of the plan to aUow a muiimum of mne months to grow material prior to instaUation. Few
nurseries have experience deaUng with native plants, especiaUy those species not used for
ornamental purposes. An experienced native plant nursery such as Tree of Life nursery in San
Juan Capistrano, Mockuigbud Nursery in Paverside, or an approved equal, should be contracted
with to coUect propagules and supply the necessary contauier grown plant material. A deposit
wUI be required to initiate the contract growing agreement. A seed supplier specializing ui native
species, such as S&S Seeds in Carpenteria, or an approved equal, should be contracted v^ith to
supply the necessary seed.
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Appropriate tunuig of planting may decrease or eUminate the need for supplemental watermg and
wUI uicrease the survival of the plants. The best survival rates are achieved when planting is
achieved between 15 November and 15 AprU. Planting at the site should be accompUshed during
the late vmiter/early spruig immediately after the hazard from winter flooduig has subsided.
Some contauier plantuigs might be aUowable ui the late faU or early wkiter of the year, per
biological monitor approval, if the areas for plantmg are outside the area of flooduig. This wiU be
determined based upon the final unplementation schedule, upon actual field conditions and
nursery supply schedules. Hydroseedmg should be timed to take advantage of seasonal rainfaU
patterns and should be appUed between faU and spring, if possible. Planting areas to be irrigated
could be seeded outside of this time frame.
In September, foUowing the first summer after instaUation, the plants should be checked for
viabUity (i.e., number of dead container plants). Sufficient replacement plants shaU be instaUed
duruig the mauitenance period ui order to help achieve the year-end standards as defined in Section
3.1 performance standards (i.e., 100 percent survival contauier planted trees, 90 percent shrubs).
The dead plant material shaU be removed and replaced with the same size material as was planted
origuiaUy. Replacement planting should be completed ui the f aU of each year. The viabUity check
Ul September should be part of the technical assessment described ui the Monitoring Plan, Section
3.(9 of this report.
2.4.5 Temporary Irrigation System
The goal of the wetland revegetation program is to create, enhance and restore a functioning
riparian system to both the onsite and offsite locations capable of mauitauiuig and supportmg the
habitats in perpetuity. Native plants may, however, require temporary krigation for
establishment when they have been grown in nursery containers and are planted under initiaUy
dry site conditions. In addition, it may not always be feasible to instaU the intended plant
materials under the ideal seasonal plantmg conditions based upon construction and grading
schedules. Thus, a temporary krigation system is beneficial to supplement the natural rauifaU
conditions and to stimulate initial plant growth and promote establishment.
The landscape contractor shaU instaU a temporary overhead spray irrigation system for all
contakier-planted and seeded areas based upon final krigation plans prepared by the landscape
architect. Supplemental hand-watering shaU be accommodated by the instaUation of quick
coupling valves as part of the irrigation system in order to initiaUy water-in the plant material and
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Conceptual Wetiand Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
to supplement the irrigation system when necessary. The irrigation system shaU be fed from
potable water or reclauned water source(s) off water meter(s) from the nearest possible sources.
Crosskigs of the drainages with irrigation mainlme or lateral Une should be mkiknized or avoided
altogether, where possible, to avoid wash-out problems. The system should be instaUed for
temporary use for approxknately three years and then discontkiued once the plant materiais have
become adequately estabUshed. The system should be completely abandoned prior to the end of
the five-year maintenance/monitoring period. To be acceptable to the resource agencies, the
system use shaU have been discontinued for two years prior to acceptance. AU overhead spray
irrigation system components shaU be completely removed from the site prior to the end of the
maintenance/ monitoring period.
Irrigation shaU be used solely for the purpose of estabUshuig vegetation on the mitigation site and
is to be considered temporary in nature. The revegetated areas shaU be overhead spray-krigated
during the drier periods of the year untU the plant materials are adequately estabUshed to survive
on natural site conditions. Irrigation should be graduaUy withdrawn based upon dkection of the
biological monitor/habitat restoration speciaUst.
2.4.6 As-Built Conditions
The Applicant shaU submit a report to the ACOE and CDFG withki sbc weeks of completion of
site preparation and planting, acknowledging the completion of the instaUation phase and
documenting the as-buUt status of the mitigation project. The report shaU include a plan or map
diagram showkig the mitigation area and the final as-buUt locations of plantings and other
uistaUations. Photographs shaU also be uicluded to document the completion of the monitoring
period and the final site conditions.
2.5 Maintenance During l\/lonitoring Period
The purpose of the monitoring program is to provide guidelines for makitenance of the
revegetated habitat. Because the goal of the revegetation program is to create a natural system
that can support itself with little or no maintenance, the primary effort of the maintenance/
monitoring program is concentrated in the first few seasons of growth to control weeds and
promote plant and seed growth. The preserved patches of southern wiUow scmb, freshwater
marsh and other wetland resources should also be maintained to control weeds and exotic plant
growth.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
2.5.1
a)
b)
c)
d)
e)
Maintenance Activities
The revegetated areas shaU be urigated with an overhead spray system durmg the drier
parts of the year, primarUy the summer months. Irrigation systems shaU be
adequately makitakied to assure coverage of aU contauier planted and seeded areas as
uidicated on the fuial plans. Irrigation should last for approxunately three years and
be phased out per biological monitor/habitat restoration specialist direction prior to
the end of the five-year maintenance and monitoruig period. The plantuigs should
survive two summers without supplemental irrigation to demonstrate adequate
estabUshment to the resource agencies.
Native understory species wUl not be cleared ki the revegetated areas. Only non-
native, exotic/invasive plant material and weeds shall be cleared. Additional
vegetation thinning of native species, if necessary, must be authorized by the
biological monitor/habitat restoration speciaUst. GeneraUy, no pruning or clearing of
vegetation in the wetland areas wiU take place after the third year.
GeneraUy, the site wiU not be fertUized durkig the mamtenance period unless
determined necessary by the biological monitor as a remedial measure to correct soU
deficiencies. The native riparian vegetation wUl not be pruned unless so dkected by
the biological monitor.
Non-native/exotic species and weeds may invade the revegetation sites and may
become a problem before or durkig the estabUshment of the intended native plant
associations. The primary exotic/invasive, non-native species mcluding pampas gras^
salt cedai; castor bean, eucalyptus and tree tobacco should be hand removed as soon
as they begki to invade and before they become too large for hand extraction. An
approximate 90 percent exotics/weed-fiee condition should be makitakied throughout
the five-year maintenance period for these species. Other weed species to be
controUed are identified in Section 2.5.2.
Dead contauier plant material shaU be replaced each year, per the appropriate
percentages, as defined ui the success criteria.
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Conceptual Wetiand Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Projea
2.5.2 General Habitat Maintenance Guidelines
Irrigation: The krigation system for the revegetation areas should be temporary m nature and
shaU be abandoned/left ki place or removed once the plantkigs are adequately estabUshed. The
mauitenance contractor, in consultation with the biological monitor/habitat restoration
specialist, shaU determine the tunuig for termkiation of the irrigation system. Irrigation
components, such as valves and sprmkler heads, may be salvaged for re-use elsewhere as dkected
by the Applicant. AU above-ground pipe and components shaU be removed. Below-ground
components shaU be abandoned in place and/or salvaged as possible.
Dead Plant Replacement: AU dead contauier plant materials above the aUowable tolerance
levels, as defined in the Performance Standards (Section 3.1), shaU be replaced with the same
species and ui the same size containers as originaUy specified (see Stetion 2.1.1 original species
compositions).
Weed Control: Weed control measures shaU include the foUowing: (1) hand removal, (2) cuttkig
or mowing, (3) chemical herbicides, (4) light exclusion. Hand removal of weeds is the most
desuable method of control and shaU be used around individuai contauier plantings. Other
secondary weeds, other than those mentioned in Section 2.5.1 d, such as sweet fermel, black
mustard and bristly ox-tongue should be hand removed before they set seed. Cuttkig or mowing
can be the most practical method but requires that makitenance personnel be able to accurately
differentiate between native plantuigs and non-native weeds. Because these species are fast
growing, it is critical that they are controUed before they shade and out-compete revegetation
plantings. Chemical control and/or physical/mechanical removal shaU be used for the highly
invasive exotics and weeds. The biological monitor/habitat restoration specialist should
coordinate with the maintenance contractor to identify specific sites where chemical herbicides
may be used. Any herbicide treatment must be specified by a Ucensed Pest Control Advisor and
appUed by a Ucensed Pest Control AppUcator. Light exclusion entaUs temporarUy covering the soU
with a material which blocks Ught to the soU surface thus uihibiting weed growth. Such
coverkigs may include organic mulch, landscape/weed fabric, compost, or straw. AIO percent
total cover of secondary weed species wiU be tolerated at the end of the five-year maintenance
period. This means that 90 percent of the revegetation site shaU be weed/exotic-free.
Clearing and Trash Removal: Prunkig or clearing of existing and/or planted native vegetation
wUl not be aUowed within the nutigation/revegetation areas unless so dkected by the biological
monitor/habitat restoration speciaUst. Deadwood and leaf Utter of native trees and shmbs shaU
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not be removed. Downed logs and leaf litter provide valuable microhabitats for kivertebrates,
reptUes, smaU mammals and buds. In addition, the decomposition of deadwood and leaf Utter
is essential for the replenishment of soU nutrients and mkierals. Non-organic trash and debris wiU
be removed from the revegetation site by hand on a regular basis, at no less than one-month
intervals, for the first year and then quarterly thereafter. Trash consists of aU man-made non-
organic materials, equipment, or debris dumped, thrown, or left withki the mitigation/
revegetation areas.
2.5.3 Schedule of Maintenance/Monitoring Inspections
The biological monitor/habitat restoration speciaUst wiU conduct quarterly mauitenance
inspections during the five-year morutoring period. Recommendations for makitenance efforts
wUl be based upon these site observations. Weed removal bythe mauitenance contractor should
be conducted on a bi-weekly basis for the first year and monthly thereafter.
3.0 MONITORING PLAN
Monitoring of the mitigation/revegetation sites has a two-fold purpose: 1) To monitor the
progress of mitigation/revegetation plantuigs by comparing quantitative measures, such as
density, percent coverage, mortality and species diversity, with the performance standards; 2) To
duect and monitor the maintenance activities through qualitative methods and determkie
remedial actions in a manner that ensures proper and appropriate mauitenance occurs on a timely
basis. Weed control and herbivory are particularly important maintenance issues that often
require ongokig attention from mauitenance persormel. The quaUtative (visual) assessments of
the habitats shaU be performed by a quaUfied biologist/habitat restoration specialist.
3.1 Performance Standards
The foUowing performance standards shaU be achieved at the end of each year foUowing plantuig
within the creation, enhancement and restoration areas. Performance standards are viewed as
interim project objectives designed to achieve the final mitigation goal. If mitigation efforts faU
to meet performance standards in any one year, the biological monitor/habitat restoration
SpeciaUst should recommend remedial actions to be implemented the foUowuig year that wUl
enhance the project to a level of conformance with the origkial standard.
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Rancho Santa Fe Road Realignment and Bridge Repiacement Project
Southern Willow Scrub Habitat (creation, enhancement and restoration areas)
First Year Performance Standards:
100 percent survival of aU contakier planted tree species
90 percent survival of aU contauier planted shmb species
40 percent total coverage of container planted tree and shrub species combkied
10 percent coverage of seeded species
90 percent weed and exotics free
Second Year Performance Standards:
90 percent survival of aU container planted tree species
80 percent survival of aU container planted shrub species
50 percent coverage of container planted tree and shrub species combined
15 percent coverage of seeded species
90 percent weed and exotics free
Third Year Performance Standards:
90 percent survival of all contakier planted tree species
80 percent survival of aU contakier planted shrub species
*60 percent coverage of tree and shrub species combined
*20 percent coverage of seeded species
*10 foot mean height for arroyo v^^ows
90 percent weed and exotics free
(* per quantitative transect measurements)
Fourth Year Performance Standards:
90 percent survival of aU container planted tree species
80 percent survival of aU container planted shrub species
*70 percent coverage of tree and shrub species combined
*25 percent coverage of seeded species
*15 foot mean height for arroyo wUlows
90 percent weed and exotics free
(* per quantitative transect measurements)
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Fifth Year Performance Standards:
90 percent survival of aU container-planted tree species
80 percent survival of aU container-planted shrub species
*80 percent coverage of tree and shrub species combined (approximately 70 percent
canopy cover for wiUows and 10 percent cover for shrubs)
*30 percent coverage of seeded species
*20 foot mean height for arroyo wiUows
90 percent weed and exotics free
(* per quantitative transect measurements)
Freshwater Marsh Habitat (creation and enhancement areas)
First Year Performance Standards:
100 percent survival container planted species.
30 percent coverage of native species (planted and volunteer)
90 percent weed and exotics free
Second Year Performance Standards:
90 percent survival contakier planted species
40 percent coverage of native species
90 percent weed and exotics free
Third Year Performance Standards:
90 percent survival contakier planted species
50 percent coverage of native species
90 percent weed and exotics free
Fourth Year Performance Standards:
90 percent survival container planted species
60 percent coverage of native species
90 percent weed and exotics free
Fifth Year Performance Standards:
90 percent survival container planted species
70 percent coverage of native species
90 percent weed and exotics free
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Conceptual Wetiand Mitigation and Monitoring Plan
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3.2 Monitoring Methods
Monitorkig shaU consist of field monitoring visits during September of the first year after planting
and then during the spring and faU of each year thereafter by a quaUfied biological
monitor/habitat restoration specialist. Spring monitoring visits wiU kiclude quantitative data
coUection of sample transect measurements and random measurements of heights of individuals.
Spring monitoring sessions in year three should determine the need to contkiue the temporary
irrigation through the foUov^ing year. FaU monitoring visits wUl include qualitative evaluation
of percent cover based on visual analysis. FaU monitorkig should be conducted to assess plant
mortality and compUance with the intended yearly standard and need for dead plant
replacements.
Permanent vegetation transect pokits wiU be estabUshed within the mitigation sites at
appropriate representative locations. Transects shaU be used to determkie compUance and
achievement of the revegetation success standards; there wiU be a minimum of seven transects
instaUed within the southern wiUow scrub revegetation areas. Permanent photo-documentation
stations wiU be established along each vegetation transect to record the progress of the mitigation
program and to document plant establishment over the five-year period. Other representative
photographs shaU be taken from general vantage points for aU creation, enhancement and
restoration areas to show the overaU development of the areas.
3.3 Annual Reports
A report outlining the results of the armual monitoring surveys based upon the anniversary date
of the instaUation, shaU be submitted to the AppUcant, the ACOE and CDFG by the end of each
year's monitoring period, through the end of the five-year period. The monitoring reports shaU
describe the existing site conditions, identify aU shortcomings of the revegetation program, and
recommend remedial measures necessary for the successful completion of the revegetation
program and to demonstrate compliance with the appropriate permit conditions.
The reports also v^ include the foUowing:
1. A Ust of names, titles and companies of aU persons who prepared the content of the
aimual report and participated ui monitoring activities;
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2. A copy of the ACOE permit, CDFG permit, any special conditions and any
subsequent letters of modification to the origkial permits;
3. Copies of representative monitoring photographs;
4. Maps identifying monitorkig areas, transect locations, planting zones, etc. as
appropriate;
5. Ouantitative data from transect measurements, per area.
3.4 Schedule for Monitoring
The revegetation effort should be assessed in September followmg the fust summer after plantmg
to determine mortaUty of kidividual contauier plants, initial success of the seeding effort and
functionkig of the krigation system. Thereafter, the site shaU be monitored twice per year for five
years, once in the spruig (quantitative data coUection) and once in the faU (qualitative
evaluation), with year-end reports produced each year at the anniversaiy date of the completion
of the instaUation.
3.5 Completion of Mitigation
3.5.1 Notification of Completion
If the AppUcant beUeves that the final success criteria have been met at the end of the five-year
monitoring period, the Applicant shaU notify ACOE and CDFG upon submitting the annual
report for the final year and request acceptance of the site and release from the permit conditions.
Early release may be possible if success criteria/performance standards are met early and the
resource agencies concur with the level of establishment and agree to release the project from the
permit requkements.
3.5.2 Regulatory Agency Confirmation
FoUowing receipt of the notification of completion, the ACOE and CDFG may visit the ske to
confirm the completion of the mitigation effort and issue letters of formal acceptance. Any
remainkig bond monies would also be granted release at that tune.
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Conceptual Wetiand Mitigation and Monitoring Plan
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3.6 Contingency Measures
3.6.1 Procedures for Initiating Contingency Measures
If an annual performance criterion is not met for aU or any portion of the mitigation proj ect in any
year or if the 'final success criteria are not met, the Applicant shaU prepare an analysis of the
cause(s) of faUure and, if determined necessary by the ACOE and CDFG, propose remedial
contuigency measures for approval. If the mitigation site has not met the performance criteria,
the responsible party's makitenance and monitoring obligations wiU continue or alternative
contingency measures wUi be negotiated untU the ACOE and CDFG give final project permit
compliance/approval.
3.6.2 Funding Mechanisms
The same funduig source for the intended mitigation proj ect, as established by the Applicant, wiU
provide funding for any additional planning, implementation and monitoring of any contingency
procedures that may be required to achieve the mitigation goals.
4.0 ACKNOWLEDGMENTS
This report was prepared by DUDEK staff John L. Mkichki (Landscape Architect#2225S/Habitat
Restoration SpeciaUst) and Myloc Nguyen (Biologist/Habitat Restoration SpeciaUst) with review
by the project manager Sherri L. MiUer (Biologist). Graphics and GIS mappuig and analyses were
provided by Lesley Terry; Tonette S. Foster provided word processing.
LITERATURE CITED AND REFERENCED
Dudek & Associates. AprU 2000 Draft Biological Resources Report and Impact Analysis Rancho Santa
Fe Road Realignment and Bridge Replacement Project. City of Carlsbad, Califorrua.
Dudek & Associates. AprU 2000 Rancho Santa Fe Road Realignment Project Pre-Construction
Notification for Nationvcide Permits 14, 18, and 33. City of Carisbad, CaUfomia.
DUDEK
& ASSOCIATES, INC.
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Conceptual Wetland Mitigation and Monitoring Plan
Rancho Santa Fe Road Realignment and Bridge Replacement Project
Dudek & Associates. AprU 2000 Request for Water Quality Certification forRancho Santa Ft Road
Realignment Project. City of Carlsbad, CaUfomia.
Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California. University of California
Press, Berkeley. 1400 pp.
HoUand, R. F. 1986. Preliminary Descriptions of tht Ttrrtstrtal Natural Communities of California.
Nongame-Heritage Program, CaUfornia Department of Fish and Game.
Reed, P.B., Jr. 1988. National List of Plant Sptcits that Occur in Wttlands: California (RegionO). U.S.
Fish and WUdUfe Service Biological Report. 88(26.10).
U.S. Army Corps of Engineers. January 1987. 1987 U.S. Army Corps of Engineers Wetland
Delineation Manual (TR Y-87-1).
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