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Home My WebLink About3537; Vista/Carlsbad Interceptor Sewer; North Agua Hedionda Interceptor Western Segment; 2004-03-01Conceptual Habitat Revegetation Plan North Agua Hedionda Interceptor Western Segment Sewer Maintenance, Access Road & Shoreline Protection Project PREPARED FOR: City of Carisbad 1635 Faraday Avenue Carlsbad, CA 92008 PREPARED BY: Dudek & Associates, Inc. 605 Third Street Encinitas, CA 92024 DRArrCONCCPTLAL HABITAT RCVCQCTATION PIAN rOR THE NORTn AOLA HEDIONDA INTERCEPTOIlSp^ER ACCES8 ROAD, SHORELINE ^^TECTk^N AND MAINTENANCE PR^ECx) CITY or CARLSBAD, Prepared fc City of Car 1635 FaraJay Aven Carlsbad^siitomik^loU' 605 Third Street ncinitas, California 92024 VifulJoshiorAndy Thomson (760) 942-5147 March 2004 I I I I I I I I ll ll i i f i i i i I DRArr CONCCPTIJAL NABITAT REVEOCTATION PIAN NORTn AGLA MCDIONDA SEWER - WESTERN SEGMENT TABLE Or CONTEIVTS Section Page No. SUMMARY 1.0 INTRODUCTION 1.1 Project Description 1.1.1 Location of Project Alignment apd][Habita 1.1.2 Project Purpose ... 1.2 Proj ect Responsibility and Documentatrc^: ^.. ^> 1.2.1 City of Carlsbad .. 1.2.2 Access Road/Shoreline ProtectiifTStruc 1.2.3 Mitigation Site Contiacto^„^if^ 1.2.4 Project Biologist .. 1.2.5 Construction Perso meht''u^t{ii!^ion 9 2.0 EXISTING CONDITIONS.^.... /7. Ij: 2.1 Project AlignmentJ^ia 2.1.1 Vegetatio^^^ 2.1.2 Soih .3 FimqtiQ^J^id Valul ' re^^^^^^nstruction, and Long-term Uses ^reatic i.l.J::y^gtatiori^ :6 Function .4 Presci^mid Proposed Uses OF MITIGATION PROJECT 26 • Habitats to be Established 27 Lapse . 33 .'2S^*^stimated Cost 33 DUDEK & ASSOCIATES, INC. North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGUA HEDIONDA SEWER - WESTERN SEGMENT TABLE Or CONTENTS Section Page No. 4.0 IMPLEMENTATION PLAN A. . ./J/ 34 4.1 4.2 4.8 4.4 4.5 4.6 Rationale for Expecting Implementation Success Preliminary Schedule x^v' '' General Outline of Habitat Creation Imj^mentationli; 4.3.1 Onsite Mitigation - Project Alig:^^nt Arj 4.3.2 Site A - Offsite Intertidal Wetl 4.3.3 Site F - Offsite Diegon Coastal S Plant Materials and Installation Requir| Irrigation Plan Required Activities During Projecf^. 4.6.1 Construction Monitor. Site Preparation Soil Export, Im Erosion Contj^ Constructii Project Sij tror 52 5.2.2 01carinf.\^d Trash Removal 58 5.2.8 E®i^^ontrol and Repair 53 Mainte^mce Schedule 54 5.3.1 ^Pb-Day Plant Establishment Period 54 S.SrSf^Five-Year Maintenance Period 54 NITORINGPLAN 55 Performance Criteria 55 Habitat Monitoring 57 Monitoring Schedule 60 Annual Reports 61 ilHi: & ASSOCIATES, INC. North Agua Hedionda - Draft Conceptual Habitat Revegetation Ptan 2798-13 pRifbjfovMl Team /pr CompUx Project* March 2004 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLJA HEDIONDA SEWER - WESTERN SEGMENT TABLE Or CONTENTS Section Page No. Ust of Tables 7.0 COMPLETION OF MITIGATION 7.1 Notification of Completion ^ ./: ';-p\/^ 7.2 Regulatory Agency Confirmation and Site IKjmpver •. 7.8 Contingency Measures /"jj/' // 8.0 SELECTED BIBLIOGRAPHY Ustof rigures Figure 1 Regional Location Figure 2 Vicinity Map Figure 3 Project Components Map Figure 4A-4E Biological Resources Man Figures 5A-B Biological Resources M^F" ^'ote: Figures 6A-B Crib Wall Profile ^fcfbss Sej Figures 7A-B Proposed Flabita^Kation Figures 8A-B^ Sewer Acces^^^^Typical , Habitat iGferftion Area 20-21 28-29 81-82 'Cribwall and with Cut Slope ... 89-40 \ fenft^fSv impacts ^Vegetation Communities and Land Cover Types 15 PreliminVj^iProjl^ Schedule Recomml'r/lKpiSpecies for Southern Coastal Salt Marsh Plant Palette 42 RecomriMded Species for Diegan Coastal Sage Scrub Plant Palette 48 Recoi^pnded Species for Crib Wall Landscaping 44 Hal^^Perforn>ance Criteria for Southern Coastal Salt Marsh 56 Mat Performance Cntena for Diegan Coastal Sage Scrub 56 hsual Performance Cnteria for Crib Wall Landscaping 57 DUDEK & ASSOCIATES, INC., March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT SUMMARY The City of Carlsbad (City) proposes to implement the North Agua Hedionda Interceptor Sewer Access Road, Shoreline Protection and Maintenance Project (NAHI Pro^ct). T^^AHI Project is being designed and proposed by the City to restore an existing degr^^i^a^^road along the NAHI sewer and provide shoreline stabilization for the acc| and/or erosion. The purpose of the access road im\ maintenance, cleaning, rehabilitation and emergency ^ existing western segment of the NAHI sewer line. Tl^eij^ temporary impacts to sensitive uplands and wetlands'^'"'*" fairs road t^ lents alon revert't 'to alio undermining routine sevj^ uld resul^!ri^j5e^hl^^and 'n communities." As mitigation for permanent impacts, the City propo^l5^S:Mj|'(i)^acre of intertidal mudflat, 0.01 acre of intertidal rocky beach, 0.40 acre of soumem coat^s^j^^^sh, and 0.30 acre of Diegan coastal sage scrub on the north shon • )L.\^ia Hbfcjk>nda I^opi>-additional 0.30 acre of Diegan coastal sage scrub will either be c©i6^' "' "'^' preserved via purchase of mitigation c^pts at t finalized). Potential temporary impac^^^ 0.07 rocky beach, 0.10 acre of southenul^^al sal kontl she :0fi farsh, <( salt marsh, <0.01 acre of develo <0.01 acre of disturbed coasta channel wjllvbe mitigat^^^p^ conditiql^. tJa*i.amt;|onalI>^ establish^roastahidt'i 3rm ige sc: oiing the lagoon or will be Mitigation Bank (not yet udflat, 0.01 acre of intertidal acre of disturbed southem coastal tidal ji^^iction, 0.74 acre of coastal sage scrub, acre of unvegetated ephemeral stream nities in place to match pre-construction ^alls proposed with the project will be planted The propose! within aijJ^ximate chara sal Occurs ; include all would be located along the north shore of the lagoon f the existing shoreline. Through this area, the shoreline is mudflat that is frequently inundated, a narrow band of coastal ub of varying degrees of disturbance on variable slopes. The sewer the slopes, slightly above the shoreline. Permanent impacts from the of the proposed access road and seawall. The proposed access road the sewerline, at the grade of the existing manholes, with the shoreline ire (i.e., seawall) directly adjacent rising approximately two feet above the grade temporary impacts may occur within a designated corridor outside the limits of grading and on cut slopes and certain trenching and staging areas along the sewer alignment. The proposed sites for habitat creation are located on the north shore of Agua Hedionda Lagoon DUDEK & ASSOCIATES. INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT south of Park Drive between Bayshore Drive and Agua Hedionda Creek. The two proposed locations were selected from six sites that were analyzed for their mitigation potential ui a Mitigation Feasibility Analysis that was performed by Dudek & Associates, Inc. (Dudek 2008) in Fall 2008. The two sites that were selected were the sites with the greatesAotential for creating the proposed habitat types. 'An.nil One of the mitigation sites is an existing unvegetated ba^KUiroun marsh and intertidal mudflat. This site will be over-^pvated to. backfilled with appropriate soil to a finish elevation Mit is t existing southern coastal salt marsh habitat that su& excavation, this site will be suitable for the installation ofel mudflat and intertidal rocky beach. bytsputhern coastal s^ ov£ p«3pj-^Qil, and tWn as tlie^i^^H !e basin on thiet. Jidlc'r After coastal salt marsh, intertidal The second site is located in a nearby upland are The non-native vegetation will be removed acre Diegan coastal sage scrub vegetatio: ently su^^^^^n-native vegetation, tsite'-wyil be res^Wwith a minimum 0.30 this site. The revegetation of temporary imt a five-year maintenance and m success criteria, all mitigation olRations gradjn?;is piop )ffsite hMtat creation areas will be subject to im. Ar^^stablishment of appropriate habitat filAx- c< iTiSip^red fulfilled. DUDEK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 I I I I I { !l jl ll fl |l |l |l i o i I I 1.0 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT INTRODUCTION The purpose of this conceptual mitigation plan is to outline appropriate revegetadon measures for creating and restoring the proposed habitat types at the two creation site^^d along the proposed construction corridor. The plan contains a proposed fi^^^^^intenance and monitoring program to ensure that the intended habitats d^pp in^^^^e with mitigation requirements. This plan presents information on permitting requirements, project impacts, revegetati recommendations, maintenance requirements, mo performance criteria. tempora: cts to se As mitigat 0.01 acre of in^ coastal coastal I credits 1.1 Project Description The City of Carlsbad (City) proposes to imple: Access Road, Shoreline Protection and is being designed and proposed by the NAHI sewer and provide shoreline stal and/or erosion. The purpose access maintenance, cleaning, rehabili^Wand §ffl^rgency exisiting western segment oi thfflAHI sc^ Ida Interceptor Sewer f]ect). The NAHI Project graded access road along the I avert further undermining dements is to allow routine sewer fairs along the 3,800 linear feet of the project would result in permanent and s vegetation commumties. im c lanenftopattSj^tne City proposes to create 0.16 acre of intertidal mudflat, beacK^^O-a^ of southern coastal salt marsh, and 0.30 acre of Diegan shoj^^Rgua Hedionda Lagoon. An additional 0.30 acre of Diegan reated on the north shore or will be preserved via purchase of "avera Mitigation Bank (not yet formed). Potential temporary mudflat, 0.01 acre of intertidal rocky beach, 0.10 acre of southern acre of disturbed southern coastal salt marsh, <0.01 acre of developed iiction, 0.74 acre of coastal sage scrub, <0.01 acre of disturbed coastal sage of unvegetated ephemeral stream channel will be mitigated by restoring in place to match pre-construction conditions. Additionally, 560 linear feet of TO|posed with the project will be planted to establish coastal sage scrub species. Mitigation requirements associated with the permanent impacts of the proposed project are calculated using a 4:1 ratio for tidal wetlands and 2:1 for sage scrub. Based on consultation with DUDEK & ASSOCIATES, INC Nortfi Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 iv.f.»ta.iT«»Mc«i«i«<p>.i«i> March 2004 1 I I I I I I I I I 1 I I I I I i I I i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT various resource agency personnel and evaluating the proposed project in terms of the California Environmental Quality Act (CEQA), mitigation for tidal wetlands shall consist of creation/restoration within the Coastal Zone and the Agua Hedionda watershed. Mitigation for impacts to coastal sage scrub are required to be at a 2:1 ratio, with at leamhl habitat creation/restoration and the remainder as preservation, if any. The creation and restoration of Diegan coastal sage scrul as discussed above, is the subject of this conceptual ham itertidaliwetlan^ habitat type It revegeta^l^^ 1.1.1 Location of Proiect Alignment and Ha^^^^tion Areas The access road/seawall project alignment area ex immediately east of Interstate 5 (1-5), following th^^orelii^ terminus of Cove Drive (Figures 1-S). The Park Drive on the north shore of Agua Hedionda Creek {Figure Z). Both areas quarter of the U.S. Geological Survey 7.5:^inute 4W. letwee ae sewer alignment from . ands^outh to the southern jrerea^n is located south of shore Drive and Agua ions of the southwestern rangle; Township IIS, Range lands, disturbed to varying degrees, several developments including private . The habitat creation area is located in an for habfl .gfjonv cctionbd-i area The project alignment area incites prim, The southe5^t;ernportion^|th^roject residence^ndak;ornLm<?icial bbm lencef and^Sk;ommeraal=;^^^ i ne naoicac creation aiea ib iuodtcu ui tharhdS becAk.«. titlyS'^'it^ie^p the Califomia Department of Fish and Game (CDFG) as part of the enftSVrftSlt ^ Ranch. An existing development occurs on the western bordci::!'''"^- '^'i-: Project Purpose / 7>e primary purpose cMhe NAHI Habitat Revegetation Project is to mitigate permanent and teSiporary impacts ±^egetation communities, including jurisdictional wetlands, sensitive fldli^^d ser^^^ublic views. In order to provide adequate mitigation in accordance with te^fejiia^Konmental Quality Act (CEQA), California Coastal Act, California Fish and cik^^^S federal Clean Water Act (CWA) and Endangered Species Act (ESA), the City DUDEK & ASSOCIATES, INC I • i>n«...<.~dT..>.f>c«i«k>pr<>M> March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 Orange County Camp Pendleton Riverside County Fallbrook Vista 1" = 8 Miles San Marcos Carlsbad Valley Center Escondido O O •z- Encinitas \ Del Mar Ranctio Santa Fe ^ Mira Mesa Rancho Bernardo Ramona Poway Santee La Jolla f San Diego J I La Mesa Lemon Grove Imperial Beach . National City Chula Vista is otay Mesa Tijuana Mexico fc North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan Regional Map FIGURE BASE MAP SOURCE: USGS 7.5 Minute Series, San Luis Rey Quadrangle 1" =2000' North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Vicinity Map FIGURE I 1" I M NEWMH2 .loM's Boat Launch 'I V BASE PHOTO SOURCE: AERIAL ACCESS LLC, JAN/MAR 2002 Sewer System Existing Paved Access Road Is New Sewer Access Road Existing Public Trail /\y Crib Wall /\^ Shoreline Protection Wall Non-Improved Sewer Access Road 200 Scale In Feet North Agua Hedionda Western Segment - Conceptual Habitat Revegetation Plan Project Components FIGURE DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT proposes to create 0.16 acre of intertidal mudflat, 0.01 acre of intertidal rocky beach, 0.40 acre of southern coastal salt marsh, and 0.80 acre Diegan coastal sage scmb, restore all temporary impacts to sensitive vegetation communities, and establish coastal sage scrub vegetation on two crib walls to be installed as part of the project. The project will increase the acreage of Di^pkoastal sage ^^^stem through grading, removal of non-native vegetation, installatio^^ nati,ve. plaht^, and long-term maintenance/management. The increased habitat area^^Aj^^ availaWe t.9;\A^dUfe that util=— these habitat types, such as various waterfowl and^t'he fedcralM^d;;thVeaftn^^ California gnatcatcher (Polioptila californica californica) ^ ^- •' "'• • - • •^ 1.2 Project Responsibility and Docum'entntii The City of Carlsbad has the responsibility for a permit from the Army Corps of Engineers Water Act, a Section 1602 Streambed Alte Water Quality Certification from the Biological Qpinion (BQ) from U.S. Development Permit (CDP) from! Environmental Impact Report (^l^jfhas be^prepare Plarming Department. ^ h ^ is the applicant for ^ion 404 of the Clean CDFG, a Section 401 fontiol Board (RWQCB), a (USFWS), and a Coastal Commission (CCC). A Draft . accordance with CEQA by the City This draft"cohcejitual revegetatibfi>plan Wc^^pared by Dudek and Associates, Inc. (Dudek), as a consul SitJtb tMGity. The GityVwholly responsible for implementing and achieving the requirementsprpvideB)iithis pli^n^'^F^ Restoration Plan shall be prepared following issuance of permits by't^eii^ribus res pons ibl^^ncies. The final plan will include appropriate reference to all sp^^ conditioh's and restrictions. The City of Mansbad s ;tfic project nanagementjal mc ^er, the City of Carlsbad will be responsible fpr coordination and .spects of-Mbitat revegetation with the assistance of the Project Biologist, ^solely responsible for administration of contracts for the project including ith the Project Biologist, Installation Contractor, and Maintenance Contractor. Decisions to stop work or suspend payment or terminate such contracts is the responsibility of the City except where-noted herein. This includes all phases of project installation, long-term maintenance, implementation of erosion control features, and biological monitoring. The City con' & ASSOCIATES, INC. Nortfi Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT may, with sole discretion and at any time, replace any of these parties. 1.2.2 Access Road/Shoreline Protection Structure Contractor The City currently anticipates constructing the proposed proj ect in tw^ would include vegetation clearing and gmbbing and installa^ initial phase would occur outside the nesting bird se^ acquisition of all necessary permits. The constructior thereafter, but may be delayed because of contract bid cMaward .p^edures. to shorten the gap between the two phases of the proj^ the breeding season restriction on clearing of habitat, tie initial phase measures. This 15) foUowiM Me :e e.itv--wiiuvork lowevef, due to he work is necessary. The initial clearing and grubbing contractor will be re^nsibll-toi condli^ting plant salvage and resource avoidance as directed by the Project BiologistTTj^tallati. jT\and m-iintenance of fencing demarcating the limits of the temporary^psti3k'tipn\cioeniLii^^ erosion control Best Management Practices (BMPs) will also ^Be resp^^biUty.o^.di^ clearing and grubbing contractor. The access road/seawall constnj(;tiOT'^ontmfc¥or will^fesponsible for coordinating with the Project Biologist regarding varioi^pnstmcdoi^ctw^^strictions such as noise levels during the breeding sea§on, erosion c^r6yBMPs, tenciiig, aii^oyee education, staging areas, etc. The contractoi^.haihi^aintarrxcommuhjcation ^JviiMft^roject Biologist throughout the construction period. I>^llov/jngrompl(.iiqr> b^tljb)K)ad, seawall, and cribwalls, all temporary impacts areas shall be restor^ to prfe;;Constmctiqh;.c^our grades and all materials and equipment shall be removed from..the sitey /my^empDM?'unpact areas which did not support sensitive vegetation prior to ^mffucHonvbut v^rqdisturbed, shall be appropriately treated to minimize erosion, sedime^ration, and colc^zatiom)y exotic invasive species. Any unauthorized impacts shall be imni^ately disclosed ffiHjcfentified to the City Project Manager and Project Biologist. Apprppriate remedial rAsures would need to be taken as soon as possible. Mitigaflffi Site Contractor TRe^Qtyiaiiiricipates using a grading contractor to excavate the soil necessary to create the desired grade at the wetlands creation area. The City also anticipates using a landscape contractor for the installation of the plant materials, irrigation, and long-term maintenance during the five-year maintenance and monitoring period for the temporary impact restoration areas, cribwall DUDEK & ASSOCIATES, INC I pnifa,ioiMin«f,.c<nH«<Fni«<a March 2004 Nortti Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT revegetation, and habitat creation areas. Under direct supervision by the City, a private contractor may also be used to implement additional elements of this plan that are beyond the normal capabilities the grading and landscape contractors. The contractor will be responsible for conformance to this conceptual restoration plan, resource agency oermits^^ contract documents. The contractor's responsibility may continue until compl^TOn^^^work and final acceptance by the City. The contractor will not be relea^^om ccmtractum'obligations until written notification is received fiom the City and the Biolog^t perti^mg satisfactor completion of all required installation tasks as defined ,iCThe installa^^^onfracR Ai 1.2.4 Project Biologist I The Project Biologist may be a City employee or a piivat'L--qiwiroiihiiTital services consultant. Preparation of this conceptual plan, interpretationX)f the >lan,-Befek^onitoring of access road/seawall construction and mitigation .ue'^h^uctior^'-install^^ monitoring of revegetated areas during the 120-day maint^^iieif^^ribd, ahdb throughout the five-year monitoring period are thi^^^nsibUity Qf ^tKfe^ Biologist. The Project Biologist shall coordinate v^th the Cit^^ardin^piviiics onsit^nd monitoring success of the project. Construction monitoring and creation ar^^^ill occur t decrease/as required by^ Project Bi'oiopist ^icXthe C(311 viasthe' ttement^Sof ^^^tcess road/seawall area and the habitat ^ut the conbLructi9rfi)eriods. Monitoring time may increase or itions anll^Struction activities. During construction, the ictibn Manager will have authority to stop work in situations where biologisarTesoui:ces, no'i^pcimiLLcci- to be impacted, are in imminent danger of direct or indirect impacts .from'cbnstruct;iq^ctivities. Each site visit will be documented in an observati^^^oittliat willnqtc^onstruction activities relating to the enhancement plan and any proje^pficiencies. i ne projec^)iologist will conduct four formal site observations during the ^ plant establishment;,pciiod for all revegetation areas. i^intenance monito^g visits will be documented with a checklist of project deficiencies and |ecommcndation^^remedial.measures. Monitoring documentation wall be provided to the Gity'^f-CarisbSl-TOr distribution and to resource agency staff as required or requested. ,& ASSOCIATES, INC, March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 I I I i i p I ll p p i r I r I i I I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 1.2.5 Construction Personnel Environmental Education Education of all project personnel will be conducted prior to implementation of the access road/seawall and mitigation projects. Before any construction activity beg^^hen new personnel and/or sub-contractors assume responsibilities for the I'cstoradoiij^ject, or when volunteer labor is utilized, the Project Biologist will meet o^^to re\devvthe"wiginal conceptual plan and existing field conditions. All project personn^^be informed,of^t^ie presence potential presence of sensitive species and habitats Information about laws relating to these biological n personnel education. The contractors will provide co' permits, landscape plans, and conceptual plan, to sub-c will review all aspects of pertinent contract docui^ protection, submittal, scheduling of formal site oH^atioi5s persons with stop work authority 2.0 EXISTING CONDITION 2.1 Project Alignment jlt in or adjaeent^b ilic^project le discussed' as pait'of^the "contract docum^^j^cluding The City and the contractors but not limited to, site communication, and L the potential restoration areas along iporai>ifiapacts may occur in three ways: (1) graded sewer ^^nment outside the road; and (3) a construction and trenching activity that includes three designated outes^Figur^A-E). The first and second categories of temporary te s^P^erm mechanical soil disturbance. The third category is t-term disturbance which would likely be limited to stockpiling ited soil disturbance. In addition, two cribwalls are proposed access road to limit cut slope impacts to coastal sage scrub. The strated on Figure 3. The following section desc the project-'i^rmTLcnt. slopes for^the road; (2) easement comdor surround staging aieas arid-acce^ impacts woulcllres a maxi^^area of pd.. and cdratruction traffic on/hc landward side A- - f c^bv^ail locations are 2.1.l\egetatiwi^ Sf^c^ corridor is located along the north shore of Agua Hedionda Lagoon east of 1-5 (Figures 4A-E). Upland habitats and land covers include coastal sage scrub, annual (non-native) grassland, ruderal, disturbed habitat, ornamental plantings, and developed land. Jurisdictional waters and wetlands include open water, southern coastal salt marsh, disturbed southern coastal salt marsh DUDEK & ASSOCIATES, INC I —— pr.(i,ui»«d-n-™j*»c».*i«p~(«o March 2004 Nortti Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^ SEE FIGURE 4B FOR BIOLOGICAL RESOURCES LEGEND 9 North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan Biological Resources Index Map - Project Alignment Area FIGURE 4A VEGETATION TYPES/LANDCOVERS: Annual Grassland AGL DH CSM CSS DEV Coastal Salt Marsh Coastal Sage Scrub Developed Land EUC IM IRB Disturbed Habitat Eucalyptus Woodland Intertidal Mudflat Intertidal Rocky Beach NOTE: A lower case'd' in front of a vegetation type designator indicates tliat it Is disturbed. An upper case 'J' following a vegetation type designator indicates that it Is Jurisdictional. / -.v/ Waters of the U. S. (Number indicates width of unvegetated channel) O Data Station Limits of Permanent Impact Limits of Temporary Impact SENSITIVE ANIMAL SPECIES: CAGN California gnatcatcher (Dudek, 2001) SMS Salt marsh skipper (Dudek, 2003) BASE PHOTO SOURCE: CITY OF CARLSBAD SEWER SYSTEM SOURCE: CITY OF CARLSBAD GIS DEPT. lADJUSTED TO TOPOGRAPHIC FEATURES) CRN OW RUD SWS Ornamental Open Water Ruderal Southern Willow Scrub \ \ Study Area Impact Area Sewer System CAGN General Area of Calling/Movement SENSmVE PLANT SPECIES: Ac Adolphia californica Ja Juncus acutus ssp. leopoldii NOTE: Numtter indicates individual plemt counts at that location. North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Biological Resources Legend - Project Alignment Area FIGURE 4B SEE FIGURE 4B FOR BIOLOGICAL RESOURCES LEGEND I I I I I I SCALE IN FEET North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Biological Resources Map - Project Alignment Area FIGURE 4C • \ • • / / // CO I c SEE FIGURE 4B FOR BIOLOGICAL RESOURCES LEGEND North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Biological Resources Map - Project Alignment Area FIGURE 4D I SEE FIGURE 4B FOR BIOLOGICAL I RESOURCES LEGEND SCALE IN FEET North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Biological Resources Map - Project Alignment Area FIGURE 4E DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT disturbed southern willow scrub, intertidal mudflat, and intertidal rocky beach. Tahle 1 lists the acreage of each community with the potential temporary impact areas. I TABLE 1: TEMPORARY IMPACTS TO PLANT COMMUNITIES AND LAND USE TYPES ' / Temporary/Short-term Impacts Grading Trenching Construction Total Sensitive Wetlands Open Water Intertidal Mudflat Intertidal Rocky Beach Southem Coastal Salt Marsh Disturbed Southem Willow Scmb Dlsturt)ed Southem Coastal Salt Marsh Sensitive Uplands Coastal Sage Scmb Disturtjed Coastal Sage Scmb Annual (Non-native) Grassland /• Non-Sensitive Uplands Eucalyptus Woodland /^\ [^ "perai^T / "^OmainentrilX OmanientarcriAiLJurisdiciioi}) ]Di^rt^^itat_\ \ DevelopSdland ^^iloped Land^dalJuiisdicj^n) pUnvegetated Stream\Chanhel*F TOTAL delated ephemeral streamCTannel is an overlay on the vegetation layer and therefore is not included in the total calculations. Numbers m may not total precisely :ounding 'I^mi^jr'aiy unpacts which require native habitat revegetation are limited to impacts to sensitive Lactation-communities (intertidal mudflat, intertidal rocky beach, coastal salt marsh, disturbed coastal salt marsh, coastal sage scrub, and disturbed coastal sage scrub). Impacts to non-sensitive communities (including developed land within tidal jurisdiction and unvegetated stream channel) and land cover types only require restoration of pre-construction contours and application of & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 Pro/rni«wd T«mj for C^impUx PH«t» March 2004 15 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT J / :d within, the appropriate BMPs {e.g., non-habitat forming/non-invasive erosion control seed mix application and temporary fiber rolls). The following is a brief description of those native habitats that will be subject to temporary impacts and thus require onsite restoration. Intertidal Mudflat Intertidal mudflat areas include all of the sandy shore between highest tide (4.91 ft AMSL) and mean lower contains little vegetation aside from algae, but it is used habitat occupies the majority of the intertidal zone Vv-^t area contains mostly sand, it is not considered a sandy beag does not have the loose soil composition typical of a s Intertidal Rocky Beach tide fl^^ /l^'>\t /\MSl>).^Thj^p ng by soni&sKorebirdsi^'his iroject corridori\^^i5gh this bse it is regularly inundated and •each community. The rocky interi;idal areas in the projec^^consis^-'^expokd.^^^ and rip-rap probably remnant fiom the shoreline protection^^ciated-yith construction of the sewer line and access road in 1965. All rocky interi;idal ha^P with^ie proje^comdor is unvegetated. Two rocky fea yean latel Idle m ofthe project (approximately 200 length) is located near the eastem intertidal areas were identified; oj ft in length) and another smalle terminus ofAe project. / \ \ . SoutherhCoastaTSalt MS^ . \ / Onsite, southem coastal skluiiarsl^occurs below ten feet in elevation, adjacent to the sandy or rocky sh^iner'Typical;species found were salt grass {Distichlis spicata), common pickleweed {Saltc^^virginica), salty Susav^{Jaumea carnosa), spiny rush Quncus acutus ssp. leopoldii) and {Atriplex spp.).riCt^al salt marsh patches are present in a variety of sizes and are c^Sntrated in the we^rn region of the project site. Four large patches of salt marsh are located ithe shoreline ^^Hoover Street and near the middle of the project adjacent to the rocky Shore.>I^r the^e^^der of tl^e project site southern coastal salt marsh is interspersed with iVderal and coastal sage scrub habitats. & ASSOCIATES, INC. I Profuloud Tcou ComfJo Profn^ MarCh 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 16 I I I 1 I i i |l |l |l 1 r P P P fl 13 P ll DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Disturbed Southern Coastal Salt Marsh Three areas of disturbed southern coastal salt marsh are mapped in the eastern portion of the project corridor. These patches support salt grass and other indicator species but^^everal non- native species including Bermuda grass {Cynodon dactylon) and scvcralsesc^^^ exotics from adjacent landscaping. • Coastal Sage Scrub /.'/ /y^\ . . Coastal sage scrub is the most common upland habitat along the project corridor,.;_^astal sage scrub habitat extends landward from the southern coas^'salt marsh and ruderal habitat. This habitat type is dominated by California sagebrush^fcmi^in oilti^ica), black sage {Salvia mellifera), California encelia {Fncelia californica), Calif^a buckwh^^t\£^go««m fasciculatum), coyote brush {Baccfiaris pilularis), \emonadehciry\lSius^titcgrifoUh)^d sumac {Malosma laurina), hut also includes pampas grass {Cond&'ia.(elloam)>^d pri«P^ear {Opuntia littoralis). Disturbed Coastal Sage Scrub Five areas of disturbed coastal sage^crub wdiimapp^ri the project corridor. These patches contained leni^ inndLLLir.-. laiuei sumac, l?4d\sag^^^ other indicator species, but they also contained se\^eral non-nativ^{!eCies including paj^pfs, hottentot-fig {Carpohrotus edulis), curly dock {RM^ICX iw^.-.'. lfotL'hounck;.\.'.?rrwW«A«-v«/g^re), and slender wild oat {Avena harhata). DisturbccKoastalsSi^e S( m^orisitc^upports 20 to 50% cover by coastal sage scrub indicator species. V' " ^ 2.1.2 XjSoils )wmai (i9/'R)'t'hcic are two soil types found onsite: Carisbad gravelly sandy loam Accdroing to B( an'^ fvlarina loamy coarsWsand. Within the temporary impact areas, most areas should be subject to relatively little s^Msturbance {e.g., stockpiling, vehicular trafficj. For the 2:1 slopes on the landwaid sidejof.tK^ccess road, the finished soil material will be native exposed cut slopes. 2.1:3 Functions and Values The habitats subject to temporary impacts represent relatively undisturbed native communities with a typical species composition for the area. One sensitive plant species occurs within the project corridor, southwestern spiny rush; two sensitive animal species occur, the federally-listed North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 PrafusloMl TMHufor Coinfilac Prafcctt March 2004 17 I I 1 I I I p p I r i P P P P P i i P i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT threatened coastal California gnatcatcher and salt marsh [wandering] skipper (Fanoquina errans). Flabitat loss and direct impacts will affect each species, however each of the species is expected to persist at relatively similar population levels post-project implementation. The diversity of birds is limited due to the small amount of habitat and^w\am6\y low habitat quality. Habitat quality for reptiles and amphibians is lo^^tod the/iversit5(of ttiese species is expected to be low because of the small amount of habita^^^ble an^the likel^v^gative effe invertebfet'es^pecies.. itertidarzmeiTh' ''worms and o? ere obs£ "flat bodied of the adjacent urban development. A number of inter; or are expected to occur both within mudflat habitats species include mud-flat crab {Hemigrapsus oregonensis), .^^..^^^ invertebrates. Within the limited areas of rocky intettUlM-;iiab^^ clusters of blue mussels {Mytilus edulis) and barnacles {Balanus glandula) wen/pos '" " • - various limpet and snail species. ^ irvisd'witJi scattered individuals of 2.1.4 Present, Post-Construction, andilong-tefm»lIses The project area consists mostly of vac^iand si with native scrub habitat. Several hcJuSs and; )rting an intertidal zone and hillsides/bluffs ' busin^^also occupy portions of the study area. The proposed, project wc permanj^nt acc^siroad, regional l>ajl segment. Ea3 produce §ev6ral''demopments to the area. These include a ) walls,^p^^ewer maintenance activities, and a designated ascribed below. The access road-Would b"cgenera[^2 J^t wide and constructed of decomposed granite with the exceptio^^rrapp?o>^Tiatd^-:1^0-foot section east of manhole number 19, where the alignment is cur acce Il app7b>m.T y paved Gos\',s,'Boat:.^unch). In addition to the 2,400 feet of decomposed granite oad, a 230-foot lo^^^^d approach road from Floover Street is proposed. The access road hai.bccn designed to c^ct and convey storm water runoff to appropriate drainage points along tne road and throug^Sie seawall. he shoreline {jjrtection wall would include a sculpted face colored to simulate a natural bluff a^jaccnLto ^lagoon edge. The shoreline protection wall would extend approximately 1,800 feet from manhole numbers 10 to 19. The height of the manholes in relation to the shoreline varies and therefore, the height of the wall, in relation to the shoreline, varies from no exposed wall to approximately sbc feet of exposed sculpted wall (Figure 3). The shoreline protection wall would DUDEK .& ASSOCIATES, INC. [ rnht<l''dT€=nt..Cm>(UxI'nlnti MiK\\ 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 18 I I I I I I ll ll I i J § P P |l I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT be constructed with a drilled pier foundation (also referred to as a cast-in-drilled-hole [CIDH] pier wall or auger cast pile wall) which allows for a reduced construction corridor. : dimensions id will be an Crib walls are proposed in two areas to avoid large cut slopes. The location and tl of the crib walls are illustrated on Figure 3. The crib wall is a plantablc surface earth-tone color, if available. The City of Carisbad Public Works would perform rou|Meirraintenanpqx)rii^ pip^ and associated manholes following construction of the dcaess road. R oViVi n>main>pHaiare ^tine"'™iht.enai^ei would require the use of a vacuum/ water jet pump veffic^oj:l^accumulat&d^ebr^^ the sewer pipeline and manholes. Other routine maintenan^'would mclude inspecti^fEhe access road, shoreline protection waU, cable railing and drainage>jsraie.' TRr^ maintenance tasks would be performed by City of Carisbad PubUc Works p^hnelNOTL..a'b]>amual basis outside the breeding season with visual inspections occurringJ^^^^^^ly as^_6hthl^hroughout the year. All activities are expected to remain confined to.theV^^a road ari Eul- ^rules tuw <Mcular access would also be located at the The regional trail designation would oc^from t^eiicUf tji^'^^e-sac at Hoover, east along the aUgnment, for the length of the ^^ne pr^tion w^i^re 3). Trail amenities designed as part of the project would be l^M at t^id of t^ul-de-sac at Hoover Street and near manhole number 19 and incluc^^ge d»ibing t#rules and regulations, trash cans and waste disposal facilities forja|tsM\gate restrict end of thc'^S^tlp-sac at Id^^^treet. 2.2 The two shore This^-a, ^ WW'" exL-^n6s east to El Ca^olleal and south, across the lagoon, to Evans Point. As part of entitfcment processi^^r development of Kelly Ranch, the developer dedicated 186-acres of mostfy wetlands ha^t land tp CDFG, including land on the north shor^of the lagoon in this }ocatidn^>Bud^ c^n&jDkj^g^veral patches of disturbed land (Figure 5A-B). Dudek conducted a mitigation feasibS^y2ialysis for the area which identified sbc potential habitat creation sites (Sites A-F). The feasibility analysis took into account existing physical features of the land as well as current ownership and planned development. Based on the highest likelihood of long-term successfiil habitat restoration, two sites were chosen to mitigate permanent impacts of the NAHI project. Je-areas^propp^ed for ha&tat creation are located south of Park Drive on the north .a Hedioncia'Jl^oq^-)etween Bayshore Drive and Agua Hedionda Creek {Figure 2). currently v^^Kd that was part of the larger Kelly Ranch ownership which I DUDEK & ASSOCIATES, INC 1 p™^»to.jT»~(»c—ftaPr** March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 19 VEGETATIOM TYPES/LANDCOVERS: A lower case'd' in front of a vegetation type designator indicates that it is disturbed. BM Brackish Marsh DH Disturbed Habitat OW Open Water Ruderal Sandy Beach CCSM Coastal Salt Marsh FWM Freshwater Marsh RUD Open Water Ruderal Sandy Beach CSS Coastal Sage Scrub IM Intertidal Mudflat SB Open Water Ruderal Sandy Beach DEV Developed Land ORN Ornamental NOTE: Waters of the U. S. (number indicates width of unvegetated channel.) o Data Station ^ Proposed Habitat {/i^^jLi Creation /\/ / Approximate Property Line Location SENSITIVE PLANT SPECIES: Ap Atriplex paciftca Ja Juncus acutus ssp. leopoldii NOTE: Number indicates individual plant counts at ttiat location. SENSITIVE ANIMAL SPECIES: CAGN California gnatcatcher CAGN General Area of Calling/Movement North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Potential Habitat Creation Area Legend FIGURE 5A t * ^ «^ »ir . ProDOsed CSSKi^ Dedication Property Line Proposed Wetlands! I Creation Area (0.6 Ac.) Site A RUD ) 1 / 1 ) / \ >^ / • * 1 / 1 /» /\ Potential CSS I Creation Area (0.3 Ac.) SEE FIGURE 5A FOR LEGEND Scale in Feet AERIAL BASE MAP SOURCE: AERIAL ACCESS LLC, JAN/MAR 2002 North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Biological Resources Map - Potential Habitat Creation Area FIGURE 5B I I 1 I i I I i i i I i I I i i 1 ti I J DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT The offsite area proposed for coastal salt marsh, intertidal mudflat and intertidal rocky beach mitigation is a shallow basin surrounded by existing coastal salt marsh and intertidal mudflat on three sides and coastal sage scrub on the fourth side (Site A). The offsite area proposed for coastal sage scrub mitigation is surrounded by an unvegetated dirt access road, ParkDriv^nd existing coastal sage scrub (Site F). Existing unvegetated dirt access paths in^e ar^^uld provide vehicular access to both of the potential mitigation sites. The folloN^gv^is^cription of the existing conditions of both Site A and F. ^Is-'-" • 2.2.1 Vegetation Site A Site A is approximately 1.12 acres in size (Figur^0A$):^dt^^^^hasin surrounded by approximately two to three-foot high berms ont^^t^est, eait^M'm:^ sides. The berms surrounding the basin contain gaps that are ai^dp^pioxiin^tdy the s&^^Me level as the basins. The gaps in the berms connect the Site A ba^tSIBjaccnt-l^ms oiyK east and west sides, and to the lagoon on the south side, that su^^southepriVi^stal salf^sh and intertidal mudflat; however, the basin vvdthin Site A is a^^lightl^^her elwis^n, precluding the establishment of these native communities, and^B^, rein^^ primajy unvegetated. Southem coastal salt marsh habitat is dominated by^^^weed^^ali he^mFrankenia salina) and salt grass. The berms surrounding the basiMu^rt Diegantcpastal^^^ scmb habitat, dominated by Califomia sage. Tho'b.nbip rises ge.i{dy!i^n\the norliK^riiisicIe and transitions from disturbed habitat to disturbd^Diega3JeoastS'^^e$Gn^ 5A-B). The elevation at the site ranges fiom approximate ^'^'*^"=j|^^ree^feet to*lij^t;'ov SiteF \an feet /iMSL. Site ^Approximately |.:S9:acres in size and currently supports non-native ruderal vegetation doriSted by fennel {Focni^ihm vulgare), black mustard {Brassica nigra), and prickly-lettuce (EdctLa serriola) {Figur^A-B). The area is surrounded by an unvegetated dirt access road on the nbrtl|bast, southe^^^nd sout^;. sides, Park Drive on the northwest side, and a patch of big saltbti'sk^A^n/^'/cJf^wf^ on'the west side, which is associated with coastal sage scrub habitat, itJfii^'ajVfragipented understor/ of pickleweed and salt grass {Figures 5A-B). Beyond the unv^^Sed dirt access road, vegetation consists of ruderal and coastal salt marsh species, including black mustard, brome grasses {Bromus spp.), Australian saltbush {Atriplex semibaccata) and Hottentot fig in the mderal areas and salt grass, pickleweed and alkali heath in coastal salt DUDEK .& ASSOCIATES, INC [ piii»iii..dTh»u)brc«ii(toPT»t«tt March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 22 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT marsh habitat. Beyond the ruderal and coastal salt marsh habitats is a large area of freshwater marsh to the east and south, dominated by cattails {Typha latifolia). 2.2.2 Soils According to Bowman (1978), soils at the proposed mitigation areas ^^^^^idal Flat at Site A and Las Flores Loamy Fine Sand at Site F. Tidal Flats ar^^pdically covered with tidal water and are either barren or can support a sparse salt-toler^^^etatioii?^e texttire of the ranges from clay to very fine sand (Bowman, 1973). La^^rcs Loap^ine Sand is art\\pl< type that consists of moderately well drained loamy fine^s^ndsprhat have a Sc (Bowman, 1973). \ - ^ 2.2.3 Functions and Values Both of the proposed mitigation sites. Sites A a^V/cmhj^ly pioi'i^Matively few, depressed biological functions and values. Site A is pr^i:il>^nvegetab^ exception of the berms that surround the basin which support ^se Diegaif^oa^tal sa^^Ciuh vegetation, and Site F is dominated by non-native vegetation^^ludin^^el (igaMlf Most Invasive Wildland Pest Plants; Widespread) and black mu^^List j^pldland rft Plants of Lesser Invasiveness), both invasive plant species, according/td^tfie Cal^f^ia In^^ Plant Council (Cal-IPC; 1999). The present functions and valu(.s.o!= S;tes A ancI I- aic.deS'ffied in more detail below. Hydrologic Functions and Values Site A Site A is, site qus^r) of the site is su he north shbre 6iS§,ua Hedionda Lagoon, which connects to the Pacific Ocean. The ightly above tlie ,meayi4iigh-tide elevation. The lower portion (approximately one- c^to tidal inundation at the highest of the high tides (above 6.6 feet _ .S'L) . The upper j#h;ion of the site lacks tidal inundation and only experiences minimal urfacc runoff froi^^ surrounding areas during rain events. There is a nearby storm drain Qutfa|l/approxim^^ 200 feet'to the west that introduces fresh water to the lagoon, and has S31 illc^in the-rcauitment of freshwater and brackish water habitats near the outfall. However, Site^T^tajr enough away from the storm drain outlet that adjacent habitat to the west is southern coastal salt marsh and intertidal mudflat. & ASSOCIATES, INC I iw..<wi<«f>c«i«i« March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 23 1 I I i 1 s' I t i i i 1 i i i i I i i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT The current hydrologic functions and values of Site A are short-term surface water storage during high tides and long-term subsurface water storage. The values of short-term and long-term water storage functions at the site are the support of limited algal growth which can support fisheries and wildlife, and limited flood control. SiteF Site F is adjacent to wetlands associated with the mouth .(ygua UeduMa Crt cl:. s it enters the lagoon. While the creek may recharge the water tatif underri^fesittii^ surfiicbstiy^iSgy level, witKahignel ation If there at the site is limited to runoff during rain events. Site Eij of approximately 21.5 feet AM.SL and a low elevation o^pprojomately 18.5 feet is sufficient surface water fiom a rain event to resulbiii-surfa^c^^low, it would be directed downslope south and east toward the lagoon as sheet R^w e archg^channels or depressions of note in Site F that collect stormwater. ''" -P' The current hydrologic fiinctions of Site F ar^^Mt^em^ during rain events and long-term subsurface water storage^jphe valu^^^rfec^ll^Jubsurface water storage are to alleviate flooding, moderate the sqiljtPiip<.-r:tt,ufc arul m^intaifisoil moisture for plant growth, and recharge surficial groundwat^ Bfogeochemica/ Function^ Site A Currently, thel^asiri vvdthin Site patches • .l •. tjietation. 1 h^lj' i' coastal jsfe sc •is-pri^rily barren, with the exception of some sparse isolated lerm^^rounding the basin are sparsely vegetated with Diegan gescrub sp&cies,, - Bibgeochemical functions and values of the unvegetated sandy- bottofn^d basin includdiiiijuted^utrient cycling by bacteria to support algal growth, sediment sinK^and trap to imprMe Water quality and lessen coastal erosion, and minimal primary p/odtiction from ben^^ diatoms and algae to improve water quality, bind sediments thereby reducmg resuspen^^^rosion, and fuel benthic food webs. The isolated patches of vegetation Ind tHek)aiselyv^tated berrn's provide limited nutrient cycling by the deposition detritus into the systefni.which fuels microbial food webs. DUDEK North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 & ASSOCIATES, INC March 2004 24 March 2004 24 I I I I 1 I I jl p p p p p p p p i I P i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT SiteF Site F currently supports nutrient cycling and organic carbon export functions. Vegetation at the site is dominated by non-native fennel, black mustard and prickly-lettuce, wl detritus into the system to fuel microbial food webs. However, consequently, these functions are depressed at the site. /\ Habitat Functions and Values / Site A ^ ^ introduce sparse, and Currently, Site A provides limited habitat functions ber.i;.y^thcic ibv^ry little vegetation present onsite. The vegetation present onsite does, howev^^^roVidc &dinl\functions. The sparsely vegetated berms provide wildlife habitat; '^^^^^^^^^^^'^^^^'-'^l^^^-^^'^'y isolated from high quality native habitat. Other functions of ^le'habitat>tisite incliMj.primary and secondary production to support food webs, see^^^\j:0iir-t6^MW^^^ production and accumulation of detritus to fiiel riiicroby^tiviti^nt(re nutrients to support plant growth. Each of these fiinctions is dossed ^le site^^^of the lack of plant diversity, which limits the diversity of primal^d se^par/ probers, variety of seeds as food sources, and diversity of detritus for mig^Kand s^fauna^» lower portion of the basin that gets inundated by high tide. might.'RJM-.-U!O iimilecl hdbitat for primary producers such as benthic diatoms anSalgae and prdyide-Foraging hbbitarfor^aterfowl. SiteF The high de|r^-o£riori-natiye s^^ dominance within Site F severely limits the habitat functio;^^wildlife\t this si^w The site is dominated by non-native species, which provides only pm: nesting habitat for bir^s and limited foraging habitat for wildlife. Other functions of thc4abitat onsite inclMeYrimarv and secondary production to support food webs, seed /• 7 - -joroduction to suppoi , . /ctii^^ities, and rec^m of nutrients to support plant growth. Each of these functions is also depr&Sd--at,the1^ecause ofthe lack of plant diversity, which limits the diversity of primary pnd'sccoiidar^praduc variety of seeds as food sources, and diversity of detritus for microbes and soiTtauna. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 pr.f»i<».ii<»«brc«>(>u.iv.im> March 2004 25 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 2.2.4 Present and Proposed Uses Current uses for the proposed mitigation sites and adjacent areas include passive and active outdoor recreation use, open space, wildlife habitat and tidal and non-tidal flood^orage. The area is also used by individuals for riding bicycles, jogging and walking^dogs.^^^G has begun management activities on the site by first installing signage indicati np^that t;hd^d is public land dedicated towards the preservation of natural resources. /Q\ As a CDFG preserve area, the primar/ long-term use oLtl^e site ^p,.^^'tkbs^ser}^tioi^^ and wildlife species. The proposed mitigation sites woujd c'n hanss^ailable haMat for hu^rous sensitive species already present in the lagoon ecosyste' improved function as open space, wildlife habitat, passive storage following implementation of this project. Aft^hip. the areas will continue to be managed and maintamediw CDF ^ = - -^ will likely include designation of trail use ajn^l^iuid'^uideline^w^ disposal areas, and interpretative signage. 3.0 GOALS OF THE MlTIfiVT10#PR0J| bitat creation sitC!S^?7ould have .and tidal and non-tidal flood of this mitigation plan, Ht^tetanagement activities P I 1 i SS I The primary goal of the NAHI ^abitat Rc/eietatio^^ject is to mitigate for permanent and temporary impacts to se^tfv/ vegeta^ion\orf0iUnities and public views by ensuring replacemejtft P^txe-construction kologicai-^ndaesthetic conditions and "no net loss" of wetlands within ^he ikgoM^ecos^Pin. Th^project will increase the acreages of intertidal wetlands and upland ha^at typc-s'thri iiii^^lYtheinstMMion of native container plants, cuttings, and seed, and will prevent tSe*-e:sta^ishmeriS^f:-n^ weeds onsite through regular maintenance. Additiona]^pafs-4ndJsite"^ecific^b]ective of the onsite mitigation program include the followij Avoid disturMice to existing saltmarsh habitats during implementation of the NAHI mitigatioi^^j ect. Salvag^^reuse existing native plant species located within the project impact area ^^^^^^ximum extent practicable. miize indirect impacts such as erosion, sedimentation, noise, trash, etc. during revegetation activities. Prevent any impacts to threatened or endangered native plant and wildlife species. DUDEK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 26 I I I I 1 I I t p p p p p p p p p I 6 i r I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 3.1 Type of Habitats to be Established Cut Slopes The landward side of the proposed access road will require cut slopes.at a 2;l^de in some locations. These cut slopes will require revegetation with coastal sage scrub sffecies typical of this area, including California sagebrush, black sage, Californi^pjia, CfiUfprnia.buckwheat, coyo^ brush, lemonadeberry, laurel sumac, bladderpod {IsoSs %rboreif)^^^t v^ti^'c (^''^P condensatus) and white sage {Salvia apiana), among others^ Appr^atelyt).i9'acre okut^es are designed into the project (Figures 4A-E). Crib Walls Two crib walls designed as part of the project will'.be^planted '.^^ith cor.s^ sage scrub species {Figures 6A-B). The wall would be suited to^mall shiuRfe^md natly^i^asses; therefore typical species would include California sagebnjsh^&c^^^CT^^^ e^ia, Califomia buckwheat and coyote brush, among others. // // A/ // Trench Areas 1 Trenching fm sewer replaceiJiMri/is not cxpectfed.-f revegetatidn iftequired pact sensitive habitat and therefore no <> jction Gorridor' Temporarv'4Const Construcriu^t'ockpijihg arid>^hicula^ activities may occur within the temporary construction corrid(^^^et beyS'^d'^irpp^i access road on landward side and five feet beyond proposed seav^on seaward si^<^|Mnately 40 feet total) (Figures 4A-E). Not including the ^ent impacts anA^tslopes areas, the construction corridor occupies a 1.89-acre area stine of 0 18 acr^intertidal wetlands and 0.57 acre of coastal sage scmb. teieiaiW^nr^^^f the construction corridor would be revegetated with coastal sage scrub of t^Sal^i\)tr'^itycurrently present in the area. Seaward portions of the corridor will require re^a^^or coastal salt marsh but would be limited to re-establishment of pre-construction contours for intertidal mudflat. Any rocks removed from intertidal rocky beach areas would need to be replaced following construction. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 27 RECOMMENDED BROW DITCH GROUND LINE TOP OF WALL 0.33' GROUND LINE - NOTE; See Figure 3 for cribwall locations & Figure 6B for cribwall profiles. * = BATTERED VERTICAL NCREMENT 0.97' FOR STD. 1:4 BATTER. NOTE: "X" MARKS FALSE HEADERS. ALL OTHERS ARE FULL HEADERS. SECTION A-A FRONT STRETCHERS (TYP.) TOP OF WALL -1 ALTERNATING JOINTS (TYP.) TOE OF WALL ^ A TYPICAL CRIB WALL ELEVATIONS NOT TO SCALE North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Typical Cribwall Elevations FIGURE 6A o I CN T IO o tM z Q. < Ij 270± LF -•172-03 1 1 4* MAX. 4' MAX. X < APN 206-172-05 ^ 6* MAX. t t t t CRIBWALL NO. 1 292± LF APN 206-200-01 ro APN 206-200-02 I APN I 206-200-03 CRIBWALL NO. 2 Cribwall Elevations NOT TO SCALE NOTE: See Figure 3 for cribwall locations. North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan Cribwall Profiles FIGURE 6B DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Site A - Intertidal Wetlands Creation The target habitat types to be created at Site A include southern coastal salt marsh, intertidal mudflat and intertidal rocky beach (Figures 7A-B). Southern coastal salt marsh wil^ dominated by pickleweed, alkali heath and saltgrass. This community type ^^be in vertical structure and spatial composition to the existing vegetation in the imn^mt^ffinity of the site. All plant species to be utilized on the site are shown in Secticm^A - IVmi M^il^niils and Installation Requirements. Currently, the elevations at Site A are too high to allov^^dj^al inundatidn^.^'Addtjgnally, existing berms on three sides of the basin preclude norni^ tidal Miing. At the highest'fiigh tide, tidal inundation reaches into the lower one-quarter of t^fe'c^inivQa^^ is proposed to bring the mean high tide line back to the north edge of the basi^md to^latp^heappropriate conditions for fiill tidal inundation in the entire basin on a regi^^^sis. Oh"c the basii^ grade is low enough to allow full tidal inundation during high tides^ storage. mction •.'^it tlie'^iite wWi include water The creation of southern coastal at Site A is intended to expand site. In order to accomplish this be impacted An estimate replacement ..atv a 2:1 accompt^j^'inp tnb.i^opo and vertebiatos, increased salt n^Rh, internal mu^aUind intertidal rocky beach habitat upon existingj^pve wetlmd habitats adjacent to the mitigation isolat^Rtches^wtastal sage scrub on existing berms will acre of/coastal'SS£;e scmb would be impacted and require coas^^-;s^pi^mb creation site. Associated functions creation, mclude improved habitat quality for invertebrates -chain pi^ductivity onsite, and improved terrestrial and aquatic rnicro-habitats^urrently depres^e^irilj^e primarily unvegetated basin. X^-"^^'i-V'lhs ^^^^ Site F -Xoastal Sage>Scrub Creation T'heMrget habitat typelJ'^^created at Site F is Diegan coastal sage scrub. Diegan coastal sage scrul vvdll be dominate'd'by California sage, California buckwheat, laurel sumac and white sage In addition to these (Bgi^{ 7A-R), wY^Ware dominant plant species in the impact area, ciomin'aht^planr^ the Diegan coastal sage scrub habitat will include, coast goldenbush Q$QCOth'a%ciizie<n) and coyote brush, which are dominant species in the adjacent patch of native uplamhabitat. DUDEK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 30 VEGETATION TYPES/LANDCOVERS: Brackish Marsh BM CCSM CSS DEV Coastal Salt Marsh Coastal Sage Scrub Developed Land DH FWM IM ORN Disturbed Habitat Freshwater Marsh Intertidal Mudflat Ornamental NOTE: A lower case'd' in front of a vegetation type designator indicates that it is disturbed. OW RUD SB Open Water Ruderal Sandy Beach : 1': Waters of the U. S. rZ77/1 Proposed Habitat v/Zyi Creation (Number indicates width of unvegetated channel) O Data Station SENSITIVE PLANT SPECIES: Ap Atriplex paciftca Ja Juncus acutus ssp. leopoldii NOTE: Number indicates individual plant counts at that location. SENSITIVE ANIMAL SPECIES: CAGN California gnatcatcher CAGN General Area of Calling/Movement North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Proposed Habitat Creation Legend FIGURE 7A North Agua Hedionda Sewer Western Segment - Conceptual Habitat Revegetation Plan Proposed Habitat Creation Area FIGURE 7B I I I I I I i ll i J ll I I I fi I I I I I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT As explained eariier, permanent impacts of the access road/seawall project require a minimum of 1:1 habitat creation. As such a minimum of 0.80 acre of coastal sage scrub creation will be a created. However, an additional 0.18 acre is required due to impacts to coastal sage scrub on Site A. Also, the City is required to preserve an additional 0.80 acre of coastal sage scr^occupied by California gnatcatchers for permanent impacts of the project. If adequate prese sage scrub cannot be achieved, the required acreage will be created o acre. If this takes place, the revegetation will also be requ^mo den^j^afc by California gnatcatchers. The habitat creation are^Rjrrently gnatcatchers; one located north of Site A and another vmt of Site^'igure coastal sage scrub impacts are mitigated through ^abi^^^^^a goal of tw effort will be to establish suitable habitat for existing gnatcatcl^r pairs ion of coastal or a total of 0.78 luitability for use two pair^ If all^p^r^^Pnt habitat creation In an effort to establish a weed-free buffer zone practicable, non-native plants on the upland portiops-of the siti removed as part of this plan. Appropriate naf i\?e uplan^^cr California encelia, and California buckN^^Fwill I^e est? disturbance areas that are located in upl^areas.Mx^y ,J7 # V 3.2 Time Lapse The various/»revegetation anticipate^tlpiWill pla It is likei VLtKat thksouth habitats vvillNdevelopSsomew However, all liabitats. vvill- to the maximum extent itlffi^^O-foot buffer will be ;cies slich.asT!alifomia sagebrush, ishec^^ erosion control on all re expe :ed,W'dtt/'aop at different rates, even though it is and se^^^^foe installed at approximately the same time, salt marsh, intertidal mudflat and intertidal rocky beach ^^uickly than the Diegan coastal sage scmb habitat. X x^vv^v^., ^ ^e^p^ars of maintenance and monitoring to ensure that they develop i^J?hcinteri3ed\abitat^Based on previous restoration experiences with similar comm^^es and land'forrii^-'I^dek expects the southern coastal salt marsh and Diegan coastal sage^ub habitats to reajsh^'percent of the mature height, form, and cover of the like habitat ty^in the vicinity of^is project within the five-year monitoring period. •require Estimi Cost; TR^^^J^ost of the NAHI Project will be approximately $455,000. The total project cost includes project planning, grading, removal of non-native plants, installation of irrigation, erosion control, and native container plants, application of hydroseed, site maintenance, five years of biological monitoring, and 10% contingency. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 Fw.uta«iT»»/i,rc«ni>k>i''<^ March 2004 33 I I I I I I I p p jl p fl s i P P I i I g I 4.0 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT IMPLEMENTATION PLAN This implementation plan describes the habitat restoration that is proposed. The plan proposes to restore temporarily impacted habitats, landscape crib walls, replace barren soil^th southern coastal salt marsh, intertidal mudflat and intertidal rocky beach at Site -^nd ^^lative ruderal vegetation with Diegan coastal sage scrub at Site F. Proje(^restoration' goap^vill be achieved through plant materials salvage, site grading, irrigation, and ^antin^S^^ibed below. 4.1 Rationale for Expecting Impleme^tio^S Cut Slopes Revegetation of the cut slopes should be successful salvaged topsoil from the impact area and will be at relatively similar aspect and slope. Addi^ occur in areas with similar soils, aspect temporary irrigation system will be ins the project to aid the establishment^ Crib Walls 'ause eh^,..(:ut*slbpes will be capped with t to exjsting; cpasM sage scmb habitat liate riji't^^pecies, that naturally or planting the slopes. A initial two to three years of cies on the slopes. VegetatipjfJ.of^fihe crib \^ls witliyiative croastaJDsclge scmb species should be successful because the designer"thc^ct^i \^l;^as:b'^an^aken into consideration when specifying plant species. Native plan^-^^cies that wi iL<fiucccs5iti^in similar crib walls in the area, and that occur in the coastal sage scmb habitah3risite,'V^L- selected for planting. Additionally, measures will be taken to ensure^^^p'propriat'e bkkfill rrfaterial behind the crib wall is used. A temporary irrigation syster^^be installe^^and utilized during the initial two to three years of the project to aid the esta^^ment of the coa^J^gt scrub species planted in the crib wall. The irrigation system will l-'c'u^d to promote a^ropriate root system development that will lead to self-sustaining v^ge^ition. Temporary Construction Corridor Revegetation of the temporary construction corridor has a high probability of success because existing topsoil will be left in place, when feasible, and pre-construction contours will be re- established prior to planting. Native plant species that are present within the temporary DUDBK .& ASSOCIATES, INC 1 rvi^uwi /<K ctrnfia March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 34 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT construction corridor prior to project impacts will be used to revegetate the temporary construction corridor. A temporary irrigation system will be installed and utilized during the initial two to three years of the project to aid the establishment of the coastal sage scrub species on the temporary construction corridor. A Within the five-foot wide temporary area extending from the edge of lagoon, there is potential for vegetation community ty^^^versi energy following introduction of the seawall. These affe^^M be mo post-revegetation maintenance and monitoring periodJAny chang necessary, the City will cooperate with wetlands resourcevagetiQes to resolve Site A - Intertidal Wetlands Creation The project design at Site A has a high probability for the establishment of the target habitat conditions wall be created by grading the^^o habitat. This v^ create the necessa^^drolq intended habitats at Site A. In addit^^he site down to 12 inches below the des^MevatioMind the finish elevation. By excavati^^Us doyy^ fo apprq seawall to the iges in wave the five- ^t^d :oiicer :.^uccess became'thc a >e creaw iropriate conditions The appropriate .e'sarnaglevat^p^of adjacent functioning 'onditions"!^ the establishment of the be overexcavated below the existing grade apprffisriate soils will be imported to create ,te elevations, the site will be subjected to the existing hydrologic tidal ^ime of ian proposes .jaeerMagoon estuary and functioning habitats tilize the same dominant plant species to {Figure .5j)<..-lyditionaU\^ the revegetc<^^He•sK^hat^^ tl^^stmgi^acent southem coastal salt marsh habitat success The site is, anS^WiU'fcpm tcN^e. maintained as natural open space, limiting the disturbance factors out§MeXhecontrol^f.this piaprfc.iJ., human disturbance) and increasing the likelihood of le mitigation effort) Site F - Coastal Sage ^rub Creation sier The- pjojc iionditiohb ; Site F also has a high probability of success because the appropriate ,uu(.iiLiiJij& Li.^. Jtablishment of Diegan coastal sage scrub habitat already occur or will be -^^ted'S'site»^:xisting non-native plants will be removed fiom the site and existing soils will be a^^3eJ to ensure a proper balance of soil nutrients and organic matter are present to promote healthy establishment of Diegan coastal sage scmb plant species. An irrigation system will be designed and installed to ensure that the installed plants and seed receive sufficient water to encourage healthy growth and development during the first two to three years of the five-year DUDEK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 35 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT maintenance and monitoring period. The mitigation area will be positioned such that natural barriers to non-native weed encroachment into the site are maximized {Figure JB). The mitigation area will also be designed to be adjacent to existing Diegan coastal sage scrub habitat west of Site F. Dominant plant species planted at the site will be typical of those that are dominant in nearby Diegan coastal sage scrub habitat. j\ ^ Similar to Site A, this site is, and will continue to be, mainAcd as natural open space, limiting . 1 1- —1 c--^ .-^r,4-,-^i ^^.;o t^in,-, ^^'^nncreasinffthe likelihood of succ^ the disturbance factors outside the control of this plan a of the mitigation effort. 4.2 Preliminary Schedule The schedule provided below in Tahle 2 represents a tii^line es^ate^j^plementation of the NAHI project based upon the City's intendcd^omtmLti.jnl"(^ejdluIe^ final schedule for implementation will be prepared by the City^^utimtfeg^ the re's^^e agencies for approval prior to the start of the project. Updates^^^chcd^ulc \\'iThb.|_gi:o^ided to all parties involved in project, as necessary. TABLE^PJ^LIMIN^ PROJEdKcHEDULE TASK DATE \ Access Rp/dlSeawiiProjecti^gnnient x JIative SefedCollecLori;Plant Piojia^ation November 2003 S^Iv^g&RIant^.aterials/^ij^lrbC'^ December 2004 CleSF'Habitat withirtemporaiV'CQnskicti^ Corridor January 2005 /.^5onstructJolh)f Access "f^pad/Seawall March 2005 // Revegetation InlfflopfrCut Slopes April 2005 / ,•• Complelion of mess Road/Seawall Construction /,. 1 (re-establishr^ of pre-constmction contours in temp, impact areas) June 2005 \ Revege^^nstallation.on Crib Walls/Temp. Impact Areas July 2005 :,T>v^orn]^Ki of Installation Report August 2005 . ' '^••'^ HabitatCres^Weas " — . Install site fencing September 2005 Non-native vegetation removal and plant salvage September 2005 & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan rrtlailc.dli^lo'CtmtUxrnlM MZK^ 2004 2798-13 36 I I I I I I i 3 1 1 I 1 |l J f I I I I iif I I I I I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONdA SEWER - WESTERN SEGMENT The project implementation schedule above shall be in strict conformance with provisions listed in the ACOE 404 permit, CDFG 1602 SAA, City of Carisbad Mitigation Monitoring and Reporting Program and Environmental Impact Report, CDP, and California 401 Water Quality Certification. 4.3 General Outline of Habitat CreationJ|npieiTje^^^ Strategy The NAHI mitigation project includes restoration of th| alignment (onsite mitigation) and creation of intertidf at Sites A and F (offsite mitigation) as mitigation alignment. The general implementation strategy for' smpora: pactl^^^^^ Diegan c^^^^^^scrub Tient impacts project areas'^^scribed below. -rm 4.3.1 Onsite Mitigation - Project Alignment-Area V Temporary impacts along the project aUg^^wiUb'? re?t^gdm^ to generally match pre- constmction conditions. Pre-construct^^ntoi^!ml^'e restored as much as is practicable in areas where the soil surface has be^^turbed^long t^^ alignment, there will be a shoreline protection wall on the ^^pd sid^p ;he se\^access road, and either a crib wall or a cut slope on the landward ^^^S^J'^^^^)- impacts should be minimal on the seaward side of the shoreline ™ection/Wai^^ll•A•Vl^^^r, where temporary impacts do occur, southermsd&y^salt marsfi; iiitert|dal rockj^ge^ahd intertidal mudflat habitats will be restored to reserfifci^'prc-ctmstruOTdS as much as is feasible. On the landward side, Diegan coastal sagk^cmb yegetatior^^JU'•b'e^pl^ on disturbed areas, cut slopes and on the crib wall, poraryimgation^'stem iSbropos^ for the Diegan coastal sage scrub revegetation areas A temporary and on the^^vall-to hcl^_establisl^-plants during the maintenance and monitoring period. 4.3.2'/ Site A - Offsite^tertidal Wetlands Mitigation SitejK is currently ar^ivegetated shallow basin surrounded by small berms on three sides sepa^ting the bas^^rom existing southern coastal salt marsh and intertidal mudflat. Grading ^s ''propo^ed^^^^the mean high tide line back to the north edge of the basin to create the ajiiprppri'atecbnc^ for full tidal inundation in the basin on a regular basis. Berms surround theBa^w^l be removed to allow unimpeded tidal inundation. The site will be over-excavated to a depth of 12 inches in order to remove sandy, saline soils that are inappropriate for salt marsh creation. Appropriate soils for salt marsh vegetation will be imported to the site to the design DUDEK ,& ASSOCIATES, INC., Pn.fo.ta.i'i«~ufr»c<>,*i«rwM> March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 38 RECOMMENDED BROW DITCH Onsite CSS Mitigotion • CRIBV^fALL Cribwall Droinoge Swole PROPOSED DRILLED- PIER WALL SEV(/ER PIPELINE-^ Sewer Access Rood oJ CALTRANS CABLE RAIL (WHERE REQUIRED) CARVED/HAND-SCULPTURED FACE MEAN HWL (5.5) Intertidol Solt Rocky Intertidal Marsh Beach Mudftot NOT TO SCALE North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan Sewer Access Road Typical Section with Cribwall FIGURE 8A PROPOSED 2:1 SLOPE (MAX) Onsite CSS Mitigotion 12" MIN. AGGREGATE ROAD SECTION 2% Droinoge Swole CULVERT (WHERE SHOWN ON PLAN) PROPOSED DRILLED- PIER WALL SEWER PIPELINE^ Sewer Access Rood • CALTRANS CABLE RAIL (WHERE REQUIRED) CARVEO/HAND-SCULPTURED FACE CM MEAN HV7L (5.5) Intertidol Solt Rocky Intertidol Morsh Beoch Mudftot 1^ NOT TO SCALE North Agua Hedionda Sewer Western Segment • Conceptual Habitat Revegetation Plan Sewer Access Road Typical Section with 2:1 Cut Slope & Culvert FIGURE 8B DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT elevation, which will be the same elevation as the adjacent existing southem coastal salt marsh habitat. It is expected that intertidal mud flat will develop in a mosaic with southern coastal salt marsh onsite in shallow depressions and in micro-channels where the duration of tidal inundation is greater. A-.^ A . / Intertidal rocky beach will be created at the southern tip of the berm'that.,ex'tcnds toward the open water of Agua Hedionda Lagoon {Figure JB). After tj^^m is remqve^^'^^'l^ will be placed on the shore of Agua Hedionda Lagoon to create the con^^s for tlT(i^e:^joprnbnt of inter^^ rocky beach. The imported rock will be salvaged froi«ie imp^aica an'd^w^i/inclj^^ic^^^ boulders and cobble. If there is not enoueh salvaged ^k and^^ble from t" adequately cover the additional rock will be . If there is not enough salvaged^^^^^p ; intertidal rocky beach creation aiea, addition; a source approved by the City and the project biologist Site F - Offsite Diegan Coastal Sage^crub Mitigcfior' gra'rea to rted from 4.3.3 Site F is currently at an appropriate eleva therefore, no grading will be required. S^pmples^ prior Dmme; to remove existing non-native plapts fro area, install a^irrigation sysfemffld perfo until weed'se^s germip.<i{c, and then co: to soils onsite are not in need of remediat deficient, soil amendments may he " leatin^'Liiegan^castal sage scmb habitat; b^'coUecBep^and tested to ensure that the he in:uall.^^of plant materials. If soils are d. The^tial implementation strategy v/ill be propc^ffiiDiegan coastal sage scmb mitigation grow and kill cycle by irrigating the area germinatior . _„ _ e weeds. The grow and kill cycle will help redutiC^ the. w^cd secdNbank inNthe soil, and thereby, improve conditions for native seed d es^blishr^iit arid rkluce long-term maintenance at the site. Following noilcnative vegetation clc^png and the grow and kill cycle(s), container plants and seed will be i^^Ied in accbrd'anceWh Section 4-4 below. The plant species composition for Site F ed to be consisCerjtvv^th plant species composition in nearby Diegan coastal sage scrub ha^^t and to be appmir'iate for coastal California gnatcatcher use and/or occupation. The t is designed t^pe dominated by California sage, black sage, California encelia, and Cali"f6j^nia buckwli,c^ 4.4 Plarit Materials and Installation Requirements Implementation of this wetland and upland planting plan must be coordinated among the Restoration Contractor, the City, the Project Biologist, and the nursery providing the plant materials under the contract growing agreement. The contracting nursery and seed supplier shall DUDEK ,& ASSOCIATES, INC I —— FnftuUm.i Turn /br OmpUx Pro^ MarCh 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 41 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT be given the maximum amount of lead time possible to allow for successful seed collection, species propagation and preparation of plant materials for transport to the project site. Plant materials for the planting plan will include container stock and seed of native coastal salt marsh and Diegan coastal sage scrub plants as indicated in the plant palettes provided b^w in Tables 3-5. A /'/ ^/ TABLE 3: RECOMMENDED SPECIES FGR SOUTHERN COASJirSALT MARSH PLANT PALEHE CRATION AREA AND TEMPORARY. JPlCTAREA^^ Ave. Botanical Name Common Name Size. . Spacing Southern Coastal Salt Marsh container plants (approximately 0.51 acre TransilionalBuflcrHydroseed mix(approximatelv0.10acre)- - '. % Purity/ (••'.•oil. . -•..' • ' . Germinatio BBHBII • Lbs. Per. "Acre '•jotarLbs; 'S.-'J^. * These species may not be appropriate for the onsite southern coastal salt marsh along the seawall, depending upon the elevation and frequency and duration of tidal inundation in that location. finish & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 Pro^urioMl IcMU/or C«nt4« FVefcct* March 2004 42 I I I I I i ll 9 |l |l I r |l |l I i i 2 I i i i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER ^ WESTERN SEGMENT TABLE 4: RECOMMENDED SPECIES FOR DIEGAN COASTAL SAGE SCRUB PLANT PALETTE CREATION AREA AND TEMPORARY IMPACT AREA Botanical Name Common Name 'Ave. Spacing :i Group total Quantity Diegan coastal sage scrub container plants (approximately 1.05 acres) % Purity / % Gemination = This Is the ininimum quality ol the seed (per species) to be accepted for the project Equivalent piirily/gcriniiiation'is'acceptable.^ '. :- -. •-. DUDEK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 rr,t..*^Ti^i^c.mti..PT<^M March 2004 43 I I I I I ( il jl ll ll p p p p p p I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT TABLE 5: RECOMMENDED SPECIES FOR DIEGAN COASTAL SAGE SCRUB PLANT PALEnE CRIB WALL LANDSCAPING Botanical Name Common Name Ave. Spacing*«Total Quantity* three feet. Instead, container plants will be spaced approximately two feet apart vertically and Note: Container plants will not be planted on the crib will be planted at the base of the crib wall and on thi • Container plants will be planted in every other.;cel five feet apart horizontally. / J // t Total quantity of container plants is an ^late which a'ssijnics that, ".ofV 0 crib walls will be 270 linear feet with an average height of six feet,,and 292 linear feetj^ith Bverage height oflhreefeetfAdditionally, in figuring the total quantity, it is assumed that there will be al)lnntable surface on the top and at the base ofJlie crib wall when it is complete, and that container plants will -'afifedthere.^'' N \ ^--also be plai A contract ^^aaga^^^^nt wi^'a suitable nursery shall be initiated prior to implementing the plai^^plan, tocnsufe ,tnkt|appropriate plant materials are reserved and to minimize costs for p^^ation of the spedes'-included in the plan. Plant material may be purchased fiom Tree of IdKnursery in San JuM^^istrano, El Native Nursery in Azusa, and Las Pilitas in Escondido. CI)thi approved sourc^or native plant materials may be available, based upon approval by the City and the Projec^^logist. The contracted nursery shall provide plants and seeds that are of cb^stSrean^ origin? StanS^ffl^hnting procedures will be employed for installing most container stock. Holes approximately twice the size of the rootball of the plant will be dug using a post hole digger or power auger. If dry soil conditions exist at the time of plant installation, holes will be filled wdth water and allowed to drain immediately prior to planting. Backfill soil will contain no DUDEK |& ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 44 I I I I I 1 p p p ll a* i 1 i i I 1 i I I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT amendments or fertilizers unless the results of the soil tests indicate that soils are deficient and are in need of amendments. Wire cages shall be installed around each of the coastal sage scrub container plants to prevent herbivory while plants are becoming established. Following installation, each plant shall be fully irrigated to the depth of the rootball to v^r-settle the backfill mix and provide moisture to the plant. A. itainid ffoni native seed sources • '"^ ^ tnative souj be I ,scondidoj/Dr ari altfernative ydros^Icd oiltp the offsite Seed shall be of coastal San Diego County origin and ma^ including S&S Seeds in Carpenteria, Anderson Seed G approved by the City and the Project Biologist. Seed shi...^ ..^^.^y,^.^ coastal sage scrub creation area and on any onsite uplanka^s^baransitionaKslppes during installation. 4.5 Irrigation Plan Site A The primary goal of the NAHI Project A-b^eptiJ^-mirtgatioh/pl^h at Site A is to establish an extension of the fimctional tidal wetlj^s syst^^hat is ^iI?of maintaining and suppori:ing itself. Excavation of existing soAs'^^wn t^ppropri0 elevations, will allow regular tidal I the adSent exist lo pxc.x.x.vv.v^.^ - ... r....,..,^..e'0fnecessary, the container plants will be irrigated^\,'it h "h^water t^jMc' ifeniediatelyv^oU^ng installation. inundation at the site, compara^ "F'"X irrigation syg^m is planneA^^Kite A. /Hbwfeye^ ol on iran. itioMliiqpes.pfetween the proposed southern coastal salt marsh habitat ii^iahd.Diegan coStai'-s^escrub habitat is intended to establish an appropriate rof-ajnix ofrktive ^mta[ salt marsh and upland species. No irrigation is plarmed for this.^^^ either; hoWeverip^priate timing of planting to correspond with seasonal rains is Erosion contr.pl and existing vegetative ^ ' \ . * w . critiomo encourage imtial^ablishment of seeded plant species. Supplemental watering with a water truck may be rMimd during the initial plant establishment phase if sufficient rains do not Jccur. t'"\ Site F, Tcmp^^Construction Corridor, Cut Slopes and Crib Walls Irrig^^^stems will be installed to ensure that native container plants and seed installed at the offsite Diegan coastal sage scrub site and the onsite temporary construction corridor, cut slopes, and crib walls become'established. The irrigation systems will be temporary and will be used & ASSOCIATES, INC, p^f.s.icutn.^i^amti.xPwiM. March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 45 I I I I 1 I s ll J ll ll ll ll ll ll ll ll il s ll ll il DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT only until the plants are established such that they can survive on their own from seasonal rainfall. The irrigation systems will be installed entirely above ground, so that all irriga^^ equipment may be removed once the systems are decommissioned. The irrigation^^ten}^^ utilize City water mains located in nearby streets and will be installed ^h a tem|3orary>vater meter (to be installed by the Gity). All onsite irrigation will consist of P^,pipe st%d on grade at 10 feel center and at all corners, providing 100 percent coverage^ig spr^^ea^- 'iji^v^^ be installed to eliminate low-head drainage. Irrigation dpfoponer^Pich asS?^ve's arid.sp4l^er heads, maybe salvaged for re-use elsewhere at the end bf the es^Mishment pcriod^^^^inj-r^ation will be installed by the Contractor. Irrigation shall s:<){5 at tl^earliest possible^e without risking significant loss of plantings. It is expected that^cjnij^ati^ii^system will be abandoned at the end of year 2 or year 3 of the five-year mainti onsite will gradually be decreased prior to the i the plants to become acclimated to the site's^ removed from the site once irrigation is t ce^nd moi^oi ing period. Watering 'Stem 1 •cin5 dtcqhimissioned to allow •glogy. Aliv^n^tion material shall be 4.6 Required Activities During^ject fermentation -1 / . /w m 4.6.1 Construction Mon^png b^iro[edB^fogist The Project Biofegist wilf-make I'^gular site^^^tions of revegetation activities throughout the duration'^fscbnst^ Thel^rpjeclsBiologist will visit habitat creation and revegetation areas as needed, dinin;' vciiiJ'a'.ion rOT\bv'al,'gSding, irrigation installation and plant installation. The Project Biologigg^aIso7evicwat^Ues for conformance to this plan, environmental permit conditions'^Mthe'^cquireniaiL.; of contract plans and specifications. Each site observation visit will b,fi^cumented in\n.dbse;^ation report. Photo-documentation of site conditions will be 1, as needed. Tle^ject Biologist, via the construction manager, wiU have authority IP work in areas ^^re biological resources, not permitted to be impacted, are in imminent ^r of damage fi^^construction activities. danger ot ^^Preparation If construction of the road and wall begins outside of the breeding season {February 15 - August 30), habitat within the temporary construction corridor will only be cleared on an as-needed basis. However, if construction of the road and wall begins during the breeding season, all habitat on & ASSOCIATES, INC I profu,in^ turn, for co>i>uiPro(<n> March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 46 I I I I I I I 3 P P 1 p i r I I I I p I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT the landward side of the temporary construction corridor {i.e., coastal sage scrubj will have to be cleared prior to construction because no clearing is allowed during the breeding season. Pre- construction clearing would be limited to above ground vegetation removal with little or no root disturbance. Breeding season clearing of coastal salt marsh would be allowed wi^pre-clearing nesting bird survey. In total, habitat removal along the project alignmeiit arca^y include up to 1.04 acre of coastal sage scrub, 0.20 acre of coastal salt rmrsh, 0. lo^icre^oyntertidal mudflat and 0.01 acre of intertidal rocky beach. ,' , Prior to beginning construction on the habitat creatio^^es, aU^if-nativc^^xotic,. _ ^ vegetation must be removed and disposed of offsite at anaccepta^landfill facility^Mjt^nally, at Site F, a grow and kill cycle shall be completed afi:er i l^c jrn.^.ation has been inst^^to reduce the weed seed bank onsite. Site access for mechanized raaclijeiy \^illbe required for removal of the majority of the non-native vegetation via an exiting urtvcgetat^.^^ access road. When working in the proposed restoration areas, a compact ral>(. r-trackbadcr^d/or track excavator under 10,000 pounds operating weight sh^lbe- iJtil'.zcdvg) ensuY^^fet disturbance to site substrates is minimized. Any other ma^^^used^onsitt^hall^^towPSI equipped tracked equipment {e.g., no tires) to prevent soi^ foot of pressure exerted by the machii / At Site A, there is a very limited onsite will ba^alvaged to t| to be sah/agedpnsitc i plant sp ncb, as idfentifie An attempt be inh ig the pounds per square Hint ot eicis(ing n^^plant cover. Existing native vegetation [est extent pracEic^. Native coastal salt marsh plant species ^eweed,^alt:gi^and alkali heath. Other coastal salt marsh .ojcct Biologist, will be salvaged and reused onsite, if feasible, ge the^a berms that bolder the AtS \de to Siwge th^ative coastal sage scmb shrubs growing on the existing :••s^;^ovv^vc^. ^ii-f to the difficulty of transplanting mature coastal sage scrub shnjfe'^fansplanting\hcm may be impractical. there is also afei^imited amount of existing native plant cover. Only a few native plants exist at the site Md salvaging them will not be practical. Salvageable matc^^rom th^ impact area will be identified by the Project Biologist prior to impact^^^JMatepaS^ to be salvaged from the impact area include selected-native plants (as idepghedby-tKeproject biologist) fiom southern coastal salt marsh and Diegan coastal sage scrub habitats, and boulders and cobble from the impacted areas of intertidal rocky beach. In areas where grading is required, the top sbc inches of soil will be salvaged prior to constmction and spread back over the top of the revegetation areas afier construction is complete. Additionally, North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 & ASSOCIATES, INC March 2004 47 March 2004 47 I I I I I I jl p i i fl ll i i a il i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT native plant material, from plants not salvaged, will be mulched and spread around the base of container plants in the revegetation areas. Methods of salvage will be coordinated with the contractor but will likely incl^ removal of plant materials with shovels and removal of rock and soil with mechanised machinery. Salvaged plant materials will likely include southern coastal salt iWsh species such*^s salt grass and pickleweed and coastal sage scrub species such as Califo^^age biush and coast prickly-pe^ All native plants for salvage will be kept onsite in a locati^agreed uporit^trhe Kojcct ^io^^ and the Construction Manager, to prevent further daiii^g^uringthe'Vcgetai i.-^ rcmo^.Ml .tiftlsite preparation activities. All native plants removed fron-TSitfe-A^amlth^ impact area,'^m^'aed for transplantation, shall be kept moist until they are plarSg'd attneir receptor site. 4.6.3 Soil Export, Import and Grading Site A appropriate elevation, soil surround Site A and the berm down to the appropriate levels for will be over-excavated at least 12 Soil export, import and grading will and hydrology for the intended that extends from the basin tow, southem coastal salt marsh ha' inches to remove sandy, hy^r^aji - A soil donor couicMor SitK\ \\ill iVidentified by the Gity or the Restoration Contractor. The soil will firsKbe'teste-d by a^ualifiSWs laboratory to ensure that it is appropriate for the proposed habitSt types ahid inspebtied'tp'Sisure that the soil is free of all contaminants and weed seed. Aft.^^has~been dct'etrninecl'by the Restoration Ecologist that the soil is appropriate for will bc>imp6rted>and spread out across the over-excavated area to the design As'istharacteristic with adjacent coastal salt marsh in this area, it is expected that a mosaic of cp"§talv^alt mars^^^ intertici^ii mud flat will develop at Site A. However, to increase the probabili glided at Site A elevation. h habitat types develop at the site, approximately 0.16 acre of the site will be tiy lower elevation than the elevation for southern coastal salt marsh. Rock from the permanently-impacted areas of intertidal rocky beach will be salvaged and transported to the intertidal rocky beach creation site (Site A). If there is not enough salvaged DUDEK & ASSOCIATES, INC. North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 rrofti.l^ti^h'C'mtUxProlM MiXU 2004 48 I I I I I il i P |l |l P P |i |l i I i i i 1 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT rock and cobble from the impact area to adequately cover the intertidal rocky beach creation area, additional rock will be imported fiom a source approved by the Gity and the project biologist. SiteF A 4.6.4 Erosion Control No soU export, soil import or grading will be required at Sit^ However, cleanng and grubbing will be required to remove the existing non-native vegeuti^rom the-site. Both Sites A and F are relatively flat, with very little el^vation^-change. Only limited erosion control will be necessary to preserve final graded eleva^ons onsitb^ncluding the slope at the transition between the proposed southern coastal salt^harsh Mta[t and^existing Diegan coastal sage scmb habitat at Site A. To protect this blopcfromTsJiect erosion, ntir^ crop species such as arroyo lupine {Lupinus succulentus) and dot^d^plantauh^zz/M^,'^^) that germinate and quickly create vegetative cover will be in^^ate&o the ftaosi#^ seed mbc for that area. Additional erosion control measures in#form^BMPs,^AnU;^^ during winter months to ensure the project is acceptable to-tff RegirfWater gtlalit/ Control Board as stipulated in the 401 water quality certificatio^Ait. Bl#s, inclu^ installation of silt fencing, fiber rolls {e.g. straw wattles), straw erosi^^ntrol blarike^^indbags, will be installed, as necessary, at key locations where wat^riirioff is exrcj ttd'tu concentrate. 4.6.5 \Cor-STri.ction Fencing N Tempo that are irary orange constmttion fcnqe^ be installed to protect environmentally sensitive areas e^i'SrJ'toScnsitiye^^ources along the impact area and surrounding the proposed mitiPamn areas. l'hc;"fenciril locations will be approved by the Project Biologist prior to installation and shaU beMsMed prior to the beginning of vegetation clearing and grading. The fc^.ce wUl consist of oi^e snow fence attached to metal T-posts. AU fencing materials must be a'nuinin-ium of four^l^high arid remain in-place construction is complete. ^'^^^MlS^ ^ Signage Signage that identifies the project sites as habitat restoration areas will be placed On the perimeters of the sites,-and wall include a phone number for additional information, directing questions to appropriate Gity personnel. Signage will remain in-place until the end of the five- year monitoring period. & ASSOCIATES, INC., I^,,fa,taudTfaau«.rCc,mtJaIV<i(M, MarCll 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 49 I 1 I I i I i I r P I I I i P P P P P P P 1 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 4.6.7 Onsite Construction Activity Restrictions During construction of the NAHI Project mitigation sites, the following guidelines shall be implemented onsite. A// the coastal California gnatcatcher ^rnia gr!atcatdiebbrce(.ling seas^ only^cSrvaftcr cohit i^etK :ation site or near the stream and only over areas No coastal sage scrub vegetation shall be cleared duri breeding season. Construction during the coastal^ or the breeding season of any other sensitive bir| nesting bird survey. Pets or domesticated animals are not allowed No machinery fluids will be added or changed channel; refueling of machinery will occur wi^ with a non-permeable membrane installed. Concrete truck wash-out areas shall be desigriat CalTrans standards. Only machinery necessary to per^^the m^tMation\vi!ljp^ allowed on site, and each machine shall be removed inm^^tely a^its t\sl; is complete. :quipp;^racked equipment {e.g., no tires) to mpact rubber-track loader and/or track exca\fktorunder ip,#0.sp^unds oiiViatingwpight. N^durnping of d^ris'or stockpiling^o^ffi'vva^ occur in or near wetland areas on site. &n^tructjSri^cc5K^t:^^^^ be limited to the existing unvegetated access path. MA^NTENA^IGE PLAt All machinery used onsite sh^l^ prevent soil compaction .^^^^^ Equipment used in the areas inst'alled'bri^he project site as part of this plan wUl be subject to the reqjfflements of this mMi^^ce plan. The Gity will be responsible for at least five years of m^ntenance and monij&ing of all habitat revegetation areas, in compliance with this conceptual intenance and management responsibility for the restoration areas along Vie.se^gr align^^will rest WTith Gity of Carisbad Public Works in coordination with private an^b'vmfeJjfcit/Planning Department, CDFG, GGG, Agua Hedionda Lagoon Foundation, and U§F^2i&^h'Soffsite habitat creation areas are under CDFG ownership and they will continue ongoing maintenance and management of the site. ,& ASSOCIATES, INC I ——- iv.fui'.'uiTowAirco.piniv.^ March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 50 I i P I I 1 I P i DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT The purpose of the maintenance plan is to provide guidelines for maintenance, erosion control, and biological monitoring of the restoration and buffer areas. Maintenance activities will occur in consultation with the Project Biologist. Because the goal of the restoration plan is to establish a natural system that can support itself with little or no maintenance, the prim^^ffort of the maintenance plan is concentrated in the first few seasons of plar^rov\^^llowing the enhancement effort, when weeds can easily out ^°^P^ ^^'^^'^^^^ maintenance activity is expected to ease each year as tl^^^ve pl^^Ste: established and local competition fiom non-native pl^p for res^ minimized through direct removal of non-natives from M site. L^^erm m for the site will include non-native, exotic, and invasiV^:plant^pccies that w_^ carried onto the site through tidal action and wind. HoWever,lhc risk of large-sc of non-native plants onto the site can be adequately rapi^pd^uring the first maintenance period by adhering to the specific maintenance and management giiidelines that are presented below. 5.1 Maintenance Activities 'he intensity of IS become mom r^:^oject si^^ lenancec^^&ns LOiitin^to be e re-invasion / A) Temporary impact restoraftn are^^d Sit*'will be irrigated to promote seed establishment and pl^^lrvival^ring tlyner parts of the year, primarily the summer months. Ir^Eon may t/e use^^^ter months to simulate a normal or atoye normal ^^^Son if natural predpSation is lacking in volume or appropriate ra.^tion/^cju&c|^v ll I r.!>io.^^M continue for a maximum of three years, rrig^tipiivolum^w^ reduced over time to acclimate plants to a non- luigated ronclition|)riorV't6^opplete cessation of irrigation. Irrigation from June to Noyeiiiber sh^^e minti!^^»to allow plants to experience normal drought cycles and ^romot^^^^riate root growth. The irrigation schedule shall be coordinated 'with the pti^HH^ist. B) Trash and icSganic debris washed or blown onto the site will be removed regularly in accordar^ with Section 5.2.2 below. Q*Thc^tes will not be fertilized during the maintenance period unless so directed by the rofect Biologist and approved by the Gity. D) Non-native species may invade the restoration site and become a problem before or during the establishment of native plant associations. Weedy, invasive, and non- & ASSOCIATES, INC. North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan ' 2798-13 March 2004 51 I 1 1 I I I i I i I I 1 i i i I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT native species (listed below in Section 5.2.1) will be controlled as soon as they begin to appear onsite. While manual control of non-native species is the preferred method, herbicide treatments may be required to adequately control some invasive species. Herbicide treatments shall only be performed with approval from t^Zity, and as directed by the Project Biologist. /\ ^ / '. N/: E) No service vehicles will be allowed in any habit'at|lrea at'^ny tinie> F) Remedial container planting and/or supplemental h^^eedin^'^ay be^nc following each monitoring stage, as directed •bythc^iject Biologislv;' G) Implementation of erosion control mea^sme^hall Be^conducted for a minimum of three years during the monitoring period!' Ero£-ioh coribol features may include sand bags, silt-fencing, installation of^eq-tE^^tile fabriOj^ber.Hls ij.e., straw wattles) .be hece^aiy by thej^roject Biologist or the or other measures as determinei Contractor. H) No machinery-dependen'^'ainten will oc'cuSrddring the breeding seasons of any sensitive birds with^^rst con^iing ab^ffthrough a nesting bird survey by a qualified avian biolo_._ ^ (7. /. -. I) I^the event ^^ff initialrrestorafion goals are not achieved, the City shall /coordinaii A'ith -thfe JProject B^^^cto identify the project's success and shall j)ri-S'-iiK-and imilig^^emedial measures to address the project shortcomings \ '; ^ liiii—i Habitat Mdinten^^^^^uidelines .... V • 5.2.1 M Weed Control > Weed control will be nemssary during the clear and grub period before grading begins, after initial m'st^ation of plant^^ seed, and throughout the five-year maintenance period. Ongoing weed cohtrolsactivitics^'^m occur within coastal salt marsh and coastal sage scrub habitat areas ^hroughdiTtlheJlorig-term maintenance period. All weed species will be removed from Sites A ari^'E^^^dof'tc^vegetation installation activities. All debris and slash generated from weed removal activities will be disposed of offsite in a legally acceptable manner. & ASSOCIATES, INC I Prt>ftuioMtTtem.forCi>mpU.PToint. MarCh 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 52 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Ji Weed control measures will include the following: (1) hand removal, (2) cutting with weed whip machines, and (3) herbicide application. Hand removal of weeds is the most desirable method of control and will be used around individual plant installations. If hand removal is ineffective for some difficult to control plant species, spot treatment with herbici^yill be done. Any herbicide treatment must be applied by a licensed pest control appUtator in^rdance with all applicable laws, regulations, safety precautions, and lab^irecticns. ^Xj' Weed control shall occur bi-weekly during January tht|'8gh Ma^^.and.mJ)nth"ly^uring through December of the first year of the long-term mlntena^pe^^^ th^fiis^ear, weed control shall occur on a monthly basis. Weed ptants^^ll be controlle^ripi^o the formation of seed heads. More frequent weeding willed .prtormed as recommended by the Project Biologist to keep any weeds establishing on th^oje^sitg^nrianageaW levels. The following weed species, which may occur on-sitrershall be cbntroIleJ)^efore seed-set: black mustard, African brass buttons {Cotula com0[oHa), sV^t fennej^alian ryegrass {Uium multiflorum), perennial ryegrass {Uium per^^heesewdedl^^^ clover (/[4elilotus spp.), tree tobacco {Nicotiana glauca),mtly o^igufe:(P/cr^Wo/Wes), castor-bean {Ricinus communis), dock {Rumex sp.), cornm<S sow-t#tle {So^Woleraceus), cocklebur {Xantfiium strumarium), salt cedar {Tamarix. s^^ottentpt ^ {CaMrotus edulis), myopomm iJVlyoporum laetum), BraziUan pepper {Schit^nolle),0^reed^undo donax), Bermuda grass {Cynodon dactylon) andsannual rabbip^s^^cg? grass {l8ypo^f(mcuspeliensis). Additional weed species that appear (mite\in adja^nt Vuf^r areas f^a^b^ded to this list if deemed necessary by the Project Biologist. i~6val 5.2.2 Clearing anclsTraslT^ Clearing of\hy n_atiyfe vegetation will not be allowed within the restoration area, _ directed by th^^^t Biologist. Trash will be removed from the restoration areas by a regular basis; Aaning no less than one-month intervals for the first year and quarterly tSretifrer. Trash coriSts of all man-made materials, equipment, or debris dumped, thrown, |va'sh&,^blown,^anmfr withi^i'the restoration areas. 5^.3._^^Erosion Control and Repair Areas that exhibit a tendency to erode wall be stabilized by revegetation, straw waddles, re- compaction, or other ineans as prescribed by the Project Biologist and approved by the City. & ASSOCIATES, INC I PTO^UIOUI T>O»/n Cpmplo Profnti MarCh 2004 North Agua Hedionda - Draft Conceptual Habitat RevegetaUon Plan 2798-13 53 I I I 1 i 1 I p p p p p I £1 P P |l P P ll DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 5.3 Maintenance Schedule Maintenance activities will be conducted concurrent with the installation of the container plant materials on the proj ect site, and will continue throughout the initial 120-day plant^ablishment period, and through the scheduled five-year maintenance and monitoiihg period. / i^'Y • k 5.3.1 120-Day Plant Establishment Period The installation contractor will be responsible for m^enanc^fthe mit^i^tion. area^or a minimum period of 120 days. Maintenance visitf sKklLbp^onducted twn^e^^^onth throughout the 120-day establishment period. At thj <. nd ol thi>}.;;^i i -d. tlie Gity, tfiecontractor and the Biologist will review the mitigation areas tc^lftcimincthi completion of the plant establishment period. Any problems detected duriiifalii-. ilvicw wjlkbc completed prior to acceptance of the mitigation areas. The contractorSKSll^e responsible fo>100 percent survival of all container plants at the end of this pcrirad>_,,,^^ Five-Year Maintenance I^Jiod // N 5.3.2 Contractor maintenance activit^^rf the sitp shall ^onducted bi-weekly during January through May, and monthly di^^June thfo^gh^g^^ber of the first year of the long-term maintenance-period. After-^e^^t year, maintenaijpL- activities shall occur on a monthly basis. The Project Bidbgist w, \ia .nduct\nspectioQS^-S^arterly basis for the duration of the five-year monitonn.^ peiiucliy T ^ ni^miencllitions for maintenance efforts will be based upon site observationNnd '.MIHI.. I udei^s'su'c^irrigation, weed control, and trash and debris removal. After the firft'sirfnmcr of esteiblishrn^nt following installation, all plants on the project site shall be chedffl for viability!\Onc-hmired percent survival of container plants is required during the first^^fr, and yu percen^h^arter, of the five-year maintenance and monitoring period. If the tr of dead conta^r plants exceed the survival requirements, they will be removed and replaced with the san^size material as was planted originally. Replacement planting will be mplemcnted t^^^^ite native;plant establishment on the project site. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 54 I 1 I 1 i I I r i i f f I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 6.0 MONITORING PLAN 6.1 Performance Criteria The habitat types to be created at the project site include southern co mudflat, intertidal rocky beach and Diegan coastal sage^^. P^l individual habitat types and have been established based ^^^^xpect within a properly functioning native habitat. In additio require landscaping to mimic natural aesthetics. Sin^ intended to establish habitat, performance criteria performance/success. arsh, intertidal c criteria vary for e developme^ .views from crib^ms revegetkion efforf is^ot imponent is bsj^^n visual regarded as interim project objectives designed to aclii^y^ {Tables 6, 7, and 8). Fulfillment of these ^itciia Performance criteria will be utilized to assess the anniM'progrcss^of the)nitigation areas, and are . ,fjj^3i>gQ3jg'as^scribedinSecf;o«3.(? ^^Yt project is progressing toward the intended habitat type and fiinctib-i;« that^ns^ute the long-term goals of the plan. If the restoration effori:s ianMneet ^^erfoimancg^slandards in any one year, the Project Biologist will recommend^i^dial ^pns to bk/^lemented that are intended to enhance the vegetation to a level'fconforra^e with;:jc original standards. ished for the transitional area between the proposed southern isting^^^coastal sage scrub habitat at Site A because the primary gS-i' i.^ c tooiun conc^^^^dlife habitat. However, adequate native vegetation cover is impori:ant tb acfiieVihg an aci%)tabl(jWel of erosion control. Native vegetation cover should be no less than-50 percent^non-ri^^pegetation cover should not exceed 10 percent cover, and there sha^^S^Siye norvhative species at the end of the five-year monitoring period. If non- native^^r exceeds th^^^fflfe anytime during the monitoring period, then additional native scedi'sSuld be introduced to^^ose areas lacking native cover. No perfo coastal criteria J "nie'Wfsite coastal^ge scrub creation area will have additional performance criteria to i i f it I fiemoi^trate suit^^y for coastal California gnatcatchers, if the City fs unable to preserve matcatcherorcii'i^ed habitat as part of the mitigation for permanent impacts of the project. Mbriitoiing-''^ gnatcatcher behavior will begin two years following plant installation and continue annually during the spring or summer until use of the created habitat is observed. "Use" is defined by observation of male or female gnatcatcher activity within the created habitat area over a minimum of one total hour during two survey days. DUD®K & ASSOCIATES, INC, u*~iT»«.f«cw*i->pn+,rt, March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 I I i I I i i I i ll p p p i i P li DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT TABLE 6: HABITAT PERFORMANCE CRITERIA FOR SOUTHERN COASTAL SALT MARSH (creation and restoration areas) '•'*Year " •V ; ''•'IM- - '•• ^ Percent Survival Southern Coastal Salt Marh Percent Native Cover Maximum Percent Non- Native Cover 1 100% 20%. 10% 2 90% 40% 10% 3 90% 60% 5% 4 90% 80% 5% 5 90% 90% 5% Percent Survivji = total pprcentage survival ol aii conlamer plants Percent Cover - total percent cover of all naUve plant species, including planted and naturally recruited. Note that in years one and two, performance criteria will be derived from {]ualitative data collected from quarteriy monitoring visits to the iniligation site. Quantitative data will be collected in years three through five. '' .- TABLE/7: HA'BITATIfftFORMAlME CRITERIA [ttaaiEGAN,COASTAL S^SCRUB (creation and restotS^rf^reas) Year Diegan Coastal Sage Scrub • Creation and Restoration Areas Percent Survival Percent Native Cover Maximum Percent Non- Native Cover 1 100% 15% 10% 2 90% 40% 10% 3 90% 70% 5% 4 90% 80% 5% 5 90% 5% Percent Survivdl = totdi percentago survival ol all container plants Percent Cover = lotal percent covei ol ail native plant species, Including planted and naturally recruited. Note that in years ono and two. perlormance criteria will be denied from qualitative data collected from quarterly monlforing visits . ito the'mitigation slte^^^^^ be coliecied lii.yeafs"thre^^ & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 Prvftssiotud Tumj for CompUj Pro^trti March 2004 56 I 1 I 1 I 1 1 J p p i ll p ll i % i i i P ll DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT TABLE 8: VISUAL PERFORMANCE CRITERIA FOR DIEGAN COASTAL SAGE SCRUB (crib walls) Site A A// Intertidal Wetlands Creation Habitat monitoring in th^^^^al mudflat "and-ihl^idal rocky beach habitat areas will be limited to-c^u^tative assessnients to dett'^niine \yhuher or not these habitats are developing as intended Qualitaitivc nSn^f oiing will docunient the presence of visible fiinctions of the habitats. Ouality asscssment'indicatorsm tHe in^^ mudflat wall be based on the presence of shrinking and swelling ohhe soil^cprcsSit^d b3^racked surface when dry, the accumulation of fine soil particles, such^s clays artd^ilts, andvtife evidence of invertebrate animals on or within the mud, such as^^jw casings-. holes~ai^d other anecdotal evidence. In the intertidal rocky beach habitat, qualit^e assessmentsVilfb^tiSed on the development of visible functions such as the presence of laianent and stablSt'^hment sites for primary producers, roosting sites for birds, presence o^f ertebrate anima^n rocks, under rocks, and in sediments under and surrounding rocks. A ative assessngie^of some of the intended functions of the intertidal rocky beach habitat Considering the inaccessibility of the habitat to the Biologist. If this is the cas^M^^^of birds using the habitat could still be assessed without access, and may be the only reasonable parameter to monitor. D^D:EK & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 57 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Habitat monitoring in the southern coastal salt marsh areas will include both qualitative and quantitative methods. Qualitative monitoring will be conducted to determine initial survival rates of container plants, plant species diversity and visual evidence of use of the revegetated area by wildlife species. Percent cover of native and non-native species planted on thejilpject site will also be estimated by visual estimates during the first two years after pxo](Xt inpiMation. Quantitative monitoring will be conducted during years^liK^hrough'five t^detcimine nativi and non-native plant species cover onsite. The foUowing imit^oddogy Tor ineas^ quantitative cover will be used: Three permanent 20-niker long^^ct lincs^U-befestaWj.'^ed randomly within the southern coastal salt marsh habitat. Alqn^^h of the ti anS^t linegfti series of 10 one-meter square quadrats will be placed over tliWe,>t.4iv.^i in alternating^ion every other meter along the transect line. Percent cover of aU DlSt;specie^^ and bare ground will be estimated to the nearest five percent cover (specie^n the one^to fiv&^p^ercent cover range will be estimated to the nearest one percent cover). T of data collection. Permanent photo loca development of the habitat over time. A photos will be presented in annual rep / If the habitat develops sufficientl'..to meet of the five-year maintenance discontinued, to avoid un^^^^rv tr ot'j do^mented at the time .ed to document the thered and representative Ve-year success criteria before the end quantitative measurements will be southern coastal salt marsh habitat. Qualitative m^toring<^ cbntmue, howigver^uiltil the five-year maintenance and monitoring ^^iiicontL.- period ir< omplai>i i theY»ojc:i hns.h.i'ii accepted and signed-off by the regulatory agencies. \ Site F - Coastal Sage S.^ Habit^monitoring iii the-D^an coastal sage scrub habitat will mclude qualitative and quaj^tive assessment^^jJlitative monitoring will be conducted by a qualified biologist (as approved by the Gity o Arisbad and the resource agencies) and consist of a general site walkover .iiiti cliaracterization^pie revegetation planting. General observations, such as health of planted specieV, signs of o^^tering,,j^d drought stress will be noted. Revegetation plantings will be karrim&tt)"'^su^il^^ percentage of cover, species mori:ality, species composition, seedling iccriii^giA^nd soil, weed and pest problems. Maintenance needs will be recorded and submitted to the installation/maintenance contractor and the Gity for appropriate action subsequent to each survey. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 iv.fa,i«udT>m/.rc«i4>biPn>^ March 2004 58 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT To augment qualitative data collection, more precise data will be collected and analyzed by a qualified biologist to document and evaluate the progress of the revegetation program toward meeting habitat goals. At year three, or before, three permanent transect sampling locations will be established at appropriate representative locations within the revegetation are^CJuantitative transect data will be collected along each of these transects in years tlirc^^thioug^e. Transects will be 25 meters long, and sampling will utilize the point-in^cept niethod'at meter intervals along each transect. Consistent sampling techniques wiirbe;used tH^pughob.^^the monitori^ process to ensure accuracy in comparative analysis. Pe^^e^t phot^ocumentatb sta^s will be established along each transect to record the ^^T^^^^^^^ {srbgramlnd plant establishment over the five-year monitoring pe^odNVc^tion samplingresult^'WiU be analyzed and included in annual monitoring reports, cfSSahelow. California gnatcatcher presence/absence surveys she biologist annually beginning two years after plaj accordance with the USFWS currently accept^ of three surveys per year. Surveys will be until gnatcatcher use of the Diegan coasp sage sc Sewer Alignment Restoration Area iuctec oe concocted By^ qualified, permitted lation.^iirveys shall be conducted in dcol for t^^pcies, with a maximum the f^year monitoring period or labitat'crcation site is observed. : Qualitative^nitoring will l5fe^tfie^only form of mp'rutsring for intertidal mudflat, intertidal rocky beach, anr'^^^niepan .coastal sage scmb-i monitorl: consist of a p health of plante be examij^^^^^lly estimate percentage of cover, species mortality, species composition, seedli^^ruitment, and soil, '^ed and pest problems. Maintenance needs will be recorded and subiifi^d to the insta\lat(on)niaintenance contractor and the Gity for appropriate action subsio^uent to each surapy. All vegetation sampling results will be analyzed and included in ,ilnnual monitoring rejpts, discussed below. ;gan^astal,si^e scmb-4veg,etation planted on the crib walls. Qualitative ' nlrte siriiila^'tp those methods proposed for the creation areas and shall ^alkw^ahd choiracterization of the revegetation planting to determine igns o?SDve|^ftering, and drought stress. Revegetation plantings will \d<^\^\SSs:p^Ss^mye monitoring will be conducted for the habitats along the seaward side of thejeayyall^fo'i'^ootential habitat type conversion due to the construction of the seawall and consequent changes to the wave energy dissipation. If type conversion is observed along the seawall, then the City will need to consult with the resource agencies to determine if amendments to the permits and appropriate mitigation are required. & ASSOCIATES, INC. I Pni«f»iwTm,f<irco«ite March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 59 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Both qualitative and quantitative monitoring will be conducted for Diegan coastal sage scrub vegetation planted on the cut slopes and along the temporary construction corridor, and southern coastal salt marsh vegetation planted along the temporary construction corridor. Revegetated Diegan coastal sage scrub areas along the temporary patchy, due to the varied topography along the north shore^ Agu not be large enough to place 25-meter permanent mor^ lengths shall be adjusted to fit within the Diegan coa^^sage consfetucti^^OTidor will be ^Ragoon, and may tra^ects. Therefore, transe^ scrul^M^^Sibn areas. Bi permanent monitoring transects will be established in agopriat^^sentatiy^locatioris-witl the revegetation areas at or before year three of the fivl^ye^tmopitoring progr£fe.;,Qiiahtitntive transect data will be collected along each of these transcqts iriye&rs three through^^Transect sampling will utilize the point-intercept method at O^/i^ter intervals along each transect. Consistent sampling techniques will be used throif^out the^moiHtonng process to ensure accuracy in comparative analysis. Permanent photo-dpc^nicntatiop statwtis will be established along each transect to record the progress ofj;herevcgetahon proe^tn^-ind plant establishment over the five-year monitoring period. )/>=• -"X. .--y // //\' = '/ For southern coastal salt marsh hab^Auadra^easurei^^Tmstead of transects, shall be used to quantify plant cover. At year thl:ee, orO^efore, ty quadrats shall be placed randomly throughout the southern coast^^narsh'4'4getaj,^^reas along the temporary construction corridor. Tj^location of ^^^^om quadrats shall be re-established on a yearly basis. For each of the l()/i^nd^n quadmsaniplfes, a one-iQetgi^uare quadrat shall be placed at the identified random*l'jjatioii oiLthe siMace,-.and^i;elative percent cover of individual species and bare ground shall be estimated. Jhc cornbined povfekshall total 100 percent for the herbaceous layer. The total percent raVer of-native plant^no^ative plants and bare ground wall be quantified to the '^^timaneiit photo locations will also be established to document the ime. Schedule Mdiiitbnng wiUpccpnnonthly during the 120-day plant establishment period, and quarterly for five ycar&"^iftrr^oS.pletion of the installation and the initial 120-day maintenance period. The rStdr'atioD-ef fort shall be assessed in fall following planting to determine mortality of individuals, initial success of the erosion seeding and functioning of the irrigation system. Thereafter, the site will be monitored four times per year for five years, with monitoring reports submitted quarterly and annual reports submitted at year end. Qualitative monitoring will be conducted during each DUDEK & ASSOCIATES, INC.. March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 60 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT site visit through the five-year monitoring period. Quantitative transect data collection will be collected in the spring of Years three through five. 6.4 Annual Reports An annual report outlining the results of the habitat monit^ng wijl be submiticd to the Gity, RWQCB, AGOE, GGG, USFWS and CDFG at the begimm^f eacli^year. Thcannual repor^ will describe the existing conditions of the project site d^ved fiomow^litaj^we tield-obscrvaMs and quantitative data to provide a comparison of anrMsucc^^meria with'ficld conditions, identify all shortcomings of the restoration plan, and recprtmi^ remedial measures^ecessary for the successful completion of the restoration project/v^l^vearly report will provide a summary of the accumulated data. Annual reports al^vilUnclude-:hi lollowing: • a list of names, titles, and companies of.airpetsons who^repared the content of the annual report and participated in monito,iui;, .ictiviues; \y I copy of the resource agency perr^^ny speq^conditiqn^ind any subsequent letters of modification; prints of biological monitor^ maps identifying monit appropriate. zbnes, and weed removal areas as The final'fifth-year monftoring report shalw^dude a vegetation map of the project site depicting the configuratiohVid exterit. of-the^-etland and upland vegetation communities across the site. The final report shall mclude i^ommen^4 for long-term maintenance activities and identify shortcomings^^ the proJ^ct^tha^lM're^ ongoing attention by the long-term management entity, aiidw'ill bTsubraitted'to the City and resource agency personnel for evaluation of project COMPLEMON OF MITIGATION Notiiidtion of Completion Wheh-rcioniforing data collected at the site indicate that the project has met performance criteria, the Gity will notify the resource agencies upon submitting the annual report. All native wetland communities established onsite will not have been irrigated for a minimum of two years before successful revegetation is considered to have been achieved. & ASSOCIATES, INC North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 March 2004 61 I I 1 1 I I i i tl I is i I i i I I DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT 7.2 Regulatory Agency Confirmation and Site Turnover Prior to final acceptance of the mitigation site, a wetland delineation may be conducted to verify that j urisdictional wetland habitat has indeed been created by the mitigation Site A. The wetland delineation report may be submitted to the AGOE for review^^p^^ prior to final sign-off. Following receipt of the final annual monitoriJt^g repc^^^^me notification of completion, representatives from the Gity, RWQCB, ACpE^etC, the NAHI mitigation site to confirm the completion of tji^'mitigaticw.wi ..^x. all permit conditions. 7.3 Contingency Measures If the final success criteria are not met, the Gity wnl prepare an analysis of the cause(s) of :DFG compliance failure(s) and, it determined to be necessary by^the'fegulat^ agencies; propose a remedial action ^1 TC ^u<, r-^^orrohoHon cihp h:i<i<nni-^.T:n.f'*' -^^f^^^rfnirTiTiM.e criterion, the GitVs F \' ••••- / for approval. If the revegetation site has<not-.rnet-.theN.perfoim^e criterion, the City's maintenance and monitoring obligations coritinue untiLthefinal pr0|&t confirmation is obtained. 8.0 SELECTED BIBLIOGR^iPHY// Atkinson, Philip W. 2003 fr J-.tertidal Habitats for Sliorebirdsi- British Trust^for Omithol6g3^tii(: Nuimcry, .Thetfoixi, Norfolk, U.K. Bulletin 100, pp. 67-71. GalEPPGN999./Pes(r^-i/L^/'PCXtst;-ficc//c; Pest Plants of Greatest Ecological Concern tn California. Oct^er'Aipp. •• GaUforn^Kli-aTDWsityibktabas'c (GNDDB). 2003. Unpublished Report, Natural Heritage /^/ision, Galifo)nia'Depai tment of Fish and Game, Sacramento, California. April to May. D&ek & Associates, 2003. Mitigation Feasibility Analysis - North Shore of Agua Hedionda /•.-• Laepon - City^Klarlsbad, California. City of Carisbad, California. Bea'uchainp,'-RA'fetchel. 1986. A Flora of San Diego County, California. Sweetwater River ^-^Pfcss^ National Gity, GA. Bossard, G., J. Randall, and M. Hoshovsky Ed. 2000. Invasive Plants of California's Wildlands. University of California Press, Berkeley, GA. fl & ASSOCIATES, INC. I iv.f.,,to-iTi««(.»c».«*«.pr*a. March 2004 North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 62 DRAET CONCEPTLAL HABITAT REVEGETATION PLAN NORTH AGLA HEDIONDA SEWER - WESTERN SEGMENT Brinson, M.M., Richard D. Rheinhardt, F. Richard Haeur, Lyndon G. Lee, Wade L. Nutter, R. Daniel Smith, Dennis Whigham. 1995. A Guidebook for AppUcation of Hydrogeomorphc Assessments to Wetlands. US Army Corps of Engineers, Wetlands Research Program Technical Report WRP-DE-11. Gooke, S.S. 1996. Wetland and Buffer Functions Semi-quantimive Ass> User's Manual. Gooke Scientific Services, Seattle, J^ingtd 'rtK>Available: Methodology. Draft M Department of Environmental Protection, Maine. Mot/DntccL/Z/^^rn www.maine.pov/dep/blwq/vollpt2.pdf. Accessed-Ecbm?iry 25, 2004. Hickman, James G. 1993. The Jepson Manual. Univers^of Califbrrua Press, Berkeley, GA Holland, R.F. 1986. Preliminary Descriptioii^^g^Terrestrifll. 'Natural Communities of California. Nongame-Heritage Program^ California.Depart^^^f Fish and Game. Neckles, Hilary A., Dionne, Michele, Bu^k, Da^^p.^Ronian, Charles T., Buchsbaum, Robert, and Hutchins, Eric. 2002. ^Amonitori^rotoc^l th ^fMs Tidal Restoration of Sal Marshes on Local and Regional Scales: RJtora^^Ecolo^/Yol. 10 No. 3, pp. 556-563. Pacific Estuarine Research Laboratwy. 1990. '^Manual for Assessing Restored and Natural Coastal \X;/lan^9^ith Fxmnpksfrom South'ernQ}tifmia. Biology Department, San Diego State i''mv..i.v.ty>N^ \ \. \ \ Zedler. joy. 1932.' SaltMar^^h RcstoratimA Guidebook for Southern California. Second Draft. San Diego'State University^ ^ \ I DUIOTK North Agua Hedionda - Draft Conceptual Habitat Revegetation Plan 2798-13 & ASSOCIATES, INC. March 2004 63 March 2004 63