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HomeMy WebLinkAbout3338; Agua Hedionda & Calavera Creek Dredging; Carlsbad Blvd Phase II Bridge & Basin; 2000-10-26HABITAT RESTORATION AND MONITORING PLAN FOR THE CITY OF CARLSBAD BRIDGE & THOROUGHFARE DISTRICT NO. 4, THECALAVERA HILLS PROJECT, AND THE DETENTION BASINS PROJECT IN CARLSBAD, CALIFORNIA Prepared for PLANNING SYSTEMS 1530 FARADAY AVENUE, SUITE 100 CARLSBAD, CA 92008 Prepared by FRED S. EDWARDS BIOLOGIST RECON NUMBER 3226B OCTOBER 26, 2000 1927 Fifth Avenue, Suite 200 San Diego, CA 92101-2358 619 / 308-9333 fax 308-9334 This document printed on recycled paper TABLE OF CONTENTS Introduction 1 Habitat Types Proposed to be Impacted 4 Responsibilities 6 Revegetation 7 Maintenance and Monitoring 12 Reference Cited 17 FIGURES Regional Location of the Project 2 Project Vicinity 3 Location of Restoration/Mitigation sites 5 TABLES Wetland Plant Community Mitigation Summary 1 Riparian Scmb Planting Densities 10 Seeding Location and Application Rates 11 Five-Year Maintenance and Monitoring Schedule 12 Anticipated Exotic Species 14 Five-Year Performance Standards 16 Introduction This habitat restoration and monitoring plan provides an implementation strategy, maintenance regime, and monitoring goals for the ultimate creation of 12.4 acres of southem willow scmb as mitigation for impacts to 4.51 acres of riparian scmb, riparian forest, riparian woodland, and cismontane alkali marsh as part of the Calavera HiUs Master Plan Phase n and Bridge and Thoroughfare District No. 4 projects. The project site is located in the northeast quadrant of the city of Carlsbad (Figures 1 and 2) and consists of three components: Calavera Hills Master Plan Phase fl area. Bridge and Thoroughfare District No. 4, and two proposed detention basins. The Calavera Hills Master Plan area is bounded by State Route 78 (SR-78) in the north with the southem boundary being an east-west line approximately one-half of a mile north of the Rancho Carlsbad Mobile Home Park. Cunent land use in the area is predominantly agricultural with remnant southern mixed/chamise chapanal and Diegan coastal sage scrub. Agricultural development has reduced and confined the remaining riparian vegetation to a nanow strip along Calavera Creek. Both the extension of College Boulevard (Reaches A and B) and Cannon Road (Reaches 3 and 4) will impact Calavera Creek. The project will temporarily impact 0.5 acre and directly impact 4.01 acres of jurisdictional waters and wetlands. The mitigation ratios required for each vegetation type are summarized in Table 1. Of the 4.01 acres of impacted wetland, 1.8 acres are occupied by the federally listed least Bell's vireo. All impacts to wetlands are considered significant and will be mitigated by the creation of 12.4 acres of southern willow scrub and least Bell's vireo habitat in Calavera Creek. TABLE 1 WETLAND PLANT COMMUNITY MITIGATION Plant Community Project Impacts (acres) Temporary Impacts (acres) Total Impacts (acres) Mitigation Ratio Required On- Site Mitigation (acres) Riparian woodland* 2.52 0.32 2.84 3 1 8.52 Riparian scrub* 0.56 0.05 0.61 3 1 1.83 Riparian forest 0.06 0.05 0.11 3 1 0.33 Cismontane alkali marsh 0.55 0.06 0.61 2 1 1.22 Seasonal cismontane 0.19 0.02 0.21 2 1 0.42 alkali marsh Non-wetland 0.13 — 0.13 1 1 0.13 jurisdictional waters TOTAL 4.01 0.50 4.51 12.45 *1.5 acre of riparian woodland and 0.3 acre of riparian scrub to be impacted is occupied by the least Belfs vireo. OCEANSIDE PROJECT LOCATION CARLSBAD ENCINITAS^ Ril t 0 MILES 2.2 M;jobs\3225e\gniphics\reginal.cdr 4.4 FIGURE 1 Regional Location of the Project t Master Plan Phase II Bridge and Thoroughfare District Detention basins Feet 2000 HGURE 2 Project Vicinity M:\jobs\3225b\biolec.apr\Fig2(vianily) - final 10/26/00 Mitigation will be carried out on-site by creating three restoration areas along Calavera Creek (Figure 3). In the College Boulevard North mitigation site (Area 1), the existing channel will be widened to create 4.3 acres of additional wetland. At the College Boulevard South mitigation site (Area 2), a detention basin built parallel to College Boulevard will catch and hold low water flows from Calavera Creek to create 0.7 acre of wetland. At the Cannon Road mitigation site (Area 3) 7.4 acres of wetland will be created. In all three restoration areas the existing non-native vegetation will be replaced with southem willow scmb. Where appropriate, the southern willow scmb vegetation will be augmented with riparian forest, riparian woodland, and alkali marsh species. These three mitigation sites will add to and enhance the cunent riparian mosaic that supports least Bell's vireo in Calavera Creek. This habitat restoration and monitoring plan provides guidelines, design criteria, and constmction methods through which a functioning southem willow scmb wetiand community can be created in Calavera Creek. Because the constmction of the roadway links is expected to be phased, installation of mitigation may also be phased. Habitat Types Proposed to be Impacted The extension of College Boulevard and Cannon Road would temporarily and permanently impact a total of 3.9 acres of wetland, including riparian scmb, woodland and forest vegetation, and seasonal and perennial cismontane alkali marsh. The overall function and value of the mixed riparian vegetation on the site is moderate to high. Surveys indicate vegetation supports several individuals of the federally listed least Bell's vireo. The vegetation where the vireos were sighted is predominantly mule fat (Baccharis salicifolia) with a westem sycamore (Platanus racemosa) overstory. The riparian scmb and riparian woodland vegetation communities throughout the area have been colonized by non-native species, including giant reed (Arundo donax), castor bean (Ricinus communis), and pampas grass (Cortderia jubata). The edges in particular have been invaded by fennel (Foeniculum vulgare) and mustard (Brassica spp) from the adjacent agricultural lands. The cismontane alkali marsh and seasonal cismontane alkali marsh found on the site are characterized by the presence of wetland species, including spiny rush (Juncus acutus ssp. leopoldii), yerba mansa (Anemopsis caifornica), salt grass (Distichlis spicata), spikerush (Eleocharis sp.), and alkali heath (Frankenia salina). The seasonal marsh is generally located at the upper end of small erosional drainages on the site. The cismontane alkali marsh is significant on the Calavera Creek site because it supports spiny msh, which is a CNPS List 4 species. M:\jobs0225b\gis\biotec.api\Hg3(Revea)- final 10/26/(X) II111111 Restoration/mitigation area \^^X College Boulevard Alignment I |V,;>^ Cannon Road Alignment I I Diegan coastal sage scrub I Southem mixed and chamise chaparral I Riparian forest I Riparian woodland I I Riparian scrub I I Freshwater marsh I Cismontane alkali marsh ~\ Cismontane alkali marsh (seasonal) I Non-native grassland Eucalyptus woodland I I Agriculture i I Dismrbed I I Developed HGURE 3 Location of Restoration/Mitigation Areas t 0 Feet 1000 2000 Both the mixed riparian vegetation and cismontane marsh in the area are supported by water flows from Calavera Creek and surface mnoff Agricultural uses have altered the natural hydrology on portions of the project site. Areas that historically supported drainages are now routinely disked. In many of these areas subsurface flows support disjunct patches of hydrophytic vegetation. Responsibilities A. Owner/Project Proponent The owner/project proponent shall provide detailed constmction drawings, phasing plans, accurate timelines, and written project specifications in conformance with this plan. The owner/project proponent shall be responsible for funding all aspects of the project including implementation, long-term maintenance, and any needed remedial actions as determined by the U.S. Fish and WildUfe Service (USFWS), Califomia Department of Fish and Game (CDFG), U.S. Army Corps of Engineers (USAGE), and City of Carlsbad. B. Project Biologist The project biologist will be an individual or team of individuals with a minimum of two years' experience in riparian community restoration. The project biologist will be retained during the project to perform the following tasks and be responsible for implementing the restoration plan in accordance with its specifications: • Consult with the contractor on any activities that may be dismptive to the mitigation. • Attend pregrading and preconstmction meetings to consult with the owner/project proponent and grading contractor and to educate the contractors on restoration goals and habitat sensitivity. • Monitor long-term maintenance activities of the mitigation area as defined herein. • Oversee and perform the required monitoring and reporting in accordance with the procedures established in this plan. C. Plant Supplier The native plant supplier may be the project biologist or a qualified native plant nursery. The plant supplier must have at least two years' experience in propagating native plants. • The plant supplier will produce properly aged plants in one-gallon containers ready for outplanting. • All plants will be produced from seed or cuttings collected on or adjacent to the site and inoculated with myconhizae. D. Seed Supplier The seed supplier, who may also be the project biologist, must have at least two years' experience collecting riparian seeds for restoration projects. • Only species specified by the project biologist will be collected. • Seed will be collected from the project site, whenever possible. The range of seed collection will be limited to within a radius of 10 miles of Calavera Creek. • The seed supplier must guarantee the purity of the collected seed. Revegetation Mitigation for impacts to riparian scmb, woodland, forest and cismontane alkali marsh will include the creation of a functioning southem willow scrub community in three restoration areas along Calavera Creek. A. Wetland Creation and Restoration 1. Goal of Mitigation The purpose of this wetland creation and enhancement is to replace functions and habitat values lost by impacts to wetlands and non-wetland jurisdictional waters from the proposed project. The quality of the created habitat will exceed that of the existing wetland habitat. This proposed mitigation would provide for a net increase in wetland acreage and an increase in habitat values beyond extant conditions. 2. Types of Habitat to Be Created Impacts to jurisdictional wetlands and non-wetland jurisdictional waters will be mitigated by the ultimate creation of 12.4 acres of southern willow scrub vegetation along Calavera Creek. Southern willow scmb is a riparian community found along major drainages but occurs in small drainages as well. Typical southern willow scmb species occurring on the project site include anoyo willow (Salix lasiolepis), black willow (Salix gooddingii). mule fat, westem sycamore, westem ragweed (Ambrosia psilostachya), blue elderberry (Sambucus mexicana), and others. Enhancement and creation will be accomplished by widening the existing channel of Calavera Creek up to an additional 150 feet and by creating additional wetlands in disturbed upland areas. Native species will be introduced using cuttings and seeds, as well as nursery-grown container stock. 3. Functions and Values of Habitat Created The proposed wetland mitigation would provide cover, nesting, and foraging opportunities for many of the local wildlife species including birds, insects, amphibians, and mammals. In particular, this restoration project will replace atypical least Bell's vireo habitat with southem willow scmb of higher quality. The created habitat in area 1 (see Figure 3) offers an improved opportunity for breeding with less noise. This created southem willow scmb will also augment cunent vireo habitat located to the west in Agua Hedionda Creek. 4. Time Lapse Planting and seeding will be limited to October 15 to April 1 in order to coincide with appropriate weather conditions. Establishment of a functioning southern willow scrub community is expected to take approximately four to five years. 5. Final Success Criteria The mitigation areas will be monitored for five years following the completion of the installation of all plant materials. At the end of the fifth year, the mitigation site shall have attained 90 percent native cover, 80 percent density, and 80 percent diversity of a target southern willow scmb community selected by the project biologist from within a 10-mile radius of the project site. The target southem willow scmb community will be selected prior to implementation of the proposed mitigation plan. This will allow the project biologist to select the proper riparian community for the specific site conditions as a target. The target community will be considered high quality, that is, a high coverage of native species with few exotic species present. 6. Target Hydrological Regime Agricultural development on both sides of Calavera Creek have nanowed and confined the creek and vegetation to a nanow strip. In mitigation ai^ea 1 the channel will be excavated and widened. Vegetation in the creek channel cunentiy receives surface runoff and water flow from Lake Calaveras through Calavera Creek. This channel will likely receive additional mnoff as local development occurs. In addition to surface flow, groundwater, located within 1 Of eet of the surface, will facilitate revegetation. Mitigation area 2 is located in a low flow detention basin on Calavera Creek located north of College Boulevard Reach B. This basin is designed to provide flood protection for a mobile home park located immediately downstream. The riparian vegetation in this basin will receive mnoff from Calavera Creek. Mitigation area 3 is located south of Cannon Road Reach 3. This mitigation area wiU receive runoff from both Calavera Creek, carried by a low flow diversion channel located in the adjacent mobile home park, and surface flow directed into the basin by culverts under Cannon Road. Excavation of the mitigation area will bring the groundwater at this site to within three feet of the soil surface. Another diversion channel will retum water from the site to Calavera Creek near its confluence with Agua Hedionda Creek. 7. Existing Functions and Values of Mitigation Area The vegetation in mitigation area 1 is riparian woodland with an overstory of western sycamore and an understory of weedy native species including mugwort (Artemisia douglasina) and jimson weed (Datura wrightii) and non-native plants including giant reed (Arundo donax), horehound (Marrubium vulgare), castor bean (Ricinus communis), and poison hemlock (Conium maculatum). The high degree of colonization by non-native species suggests this community is atypical habitat for regional sensitive bird species. The detention basin of mitigation area 2 will be located on agricultural lands. This site is dominated by weedy non-native grasses. Mitigation area 3 will also be located on agricultural land but will incorporate a small isolated patch of riparian woodland. 8. Implementation This restoration plan will use cuttings from the local area, salvaged plants collected from habitat impacted by thee College Boulevard and Cannon Road extensions, as well as nursery-grown container plants. The three sites will be planted with native species appropriate to southern willow scmb. Because of its proximity to the alkali marsh impacted by the Cannon Road extension and increased probability that the soil conditions will support this habitat type, the southernmost section of restoration area 3 will be planted with plants salvaged from the impacted alkali marsh. a. Site Preparation In mitigation area 1, heavy equipment will be used to widen the existing channel by approximately 150 feet. This will create a planting area in the channel bottom within five to ten feet of the water table. In mitigation areas 2 and 3, heavy equipment will be used to remove topsoil and bring the soil surface closer to groundwater. Where possible, the existing riparian vegetation will be clearly marked to remain undisturbed by earth-moving activities. The project biologist will be on-site during grading to ensure minimum impacts to the existing wetland vegetation. As part of the grading, all non-native trees will be removed from the drainage. The spoils from channel excavation will be completely removed from the site to prevent non-native seed dispersal. b. Irrigation Precipitation in southem Califomia is often inegular with on average one out of every three years experiencing drought. Restoration projects dependent on natural rainfall can be severely hampered by poor rainfall years. To improve restoration success and provide greater flexibility in project implementation, an automated overhead sprinkler irrigation system will be instaUed prior to planting. c. Container Plants Willow, Cottonwood, and mule fat cuttings will be taken from trees within a 10-mile radius of the mitigation site. These cuttings will be rooted in one-gallon containers for planting at the wetland creation site. San Diego sagewort (Artemisia palmeri) and blue elderberry will be grown from locally collected seeds. Cuttings and container plant densities are presented in Table 2. Installation of native plants will begin after grading of the wetland habitat restoration area. Plant installation will be limited to the months of October 15 through April 1. TABLE 2 RIPARIAN SCRUB PLANTING DENSITIES Species Number per Acre Size Mule fat Baccharis salicifolia 200 one-gallon Arroyo willow Salix lasiolepis ICQ one-gallon Black willow Salix gooddingii 100 one-gallon Red willow Salix gooddingii 100 one-gallon Westem sycamore Platanus racemosa 75 one-gallon Blue elderberry Sambucus mexicana 50 one-gallon Califomia rose Rosa californica 50 one-gallon Fremont cottonwood Populus fremontii 25 one-gallon 10 d. Seed Collection and Application Seed collection will begin at least six months prior to restoration implementation. Following installation of salvaged and container plants, the mitigation sites will be seeded. Two different seed mixes will be prepared for the project site. One species mix will be used for low-lying areas that will eventually become riparian understory and a second upland mix will be used for berm slopes and transitional areas. To prevent disturbance of transplants, the riparian understory seed mix will be applied by hand. The upland seed mix may be either hand seeded or hydroseeded as directed by the project biologist. Target species and application rates for both seed mixes are included in Table 3. TABLE 3 RIPARIAN AND TRANSITIONAL AREA SEED MIXES Species Pounds/Acre Suggested %Purity/%Germination Arroyo willow Salix lasiolepis Mugwort Artemisia douglasiana Mule fat Baccharis salicifolia Westem ragweed Ambrosia psilostachya Tarragon Artemisia dracunculus Blue elderberry Sambucus mexicana Califomia buckwheat Eriogonum fasciculatum Califomia sagebrush Artemisia califomica Purple needlegrass Nassella puichra Giant ryegrass Leymus condensatus Riparian Seed Mix 2 1 1 Transitional Area and Slope Mix 2 0.25 N/A 10/50 2/20 85/25 10/50 95/20 10/65 15/50 70/60 70/80 B. As-built Plan Within 45 days of the completion of mitigation implementation, an as-built plan will be submitted to the City of Carlsbad, CDFG, and USAGE. This plan will include implementation dates, plant numbers and locations, and any significant problems 11 encountered or if changes are needed to be made in the field during implementation of the final restoration plan, to determine if the initigation project has been built as proposed. Maintenance and Monitoring The objectives of the maintenance and monitoring program are to ensure successful habitat establishment and development of an information base, which documents the maintenance and monitoring efforts. To achieve these objectives, the project biologist will observe and direct restoration implementation, maintenance, and monitoring activities. The monitoring and maintenance period will begin immediately upon completion of plant installation and will last for a period of five years, as presented in Table 4. The maintenance program will ensure that debris removal, weed control, replanting and reseeding, site protection, and other tasks are adequately performed. Maintenance measures will be conducted as outlined below for all restoration and enhancement areas. TABLE 4 FIVE-YEAR MAINTENANCE AND MONITOREVG SCHEDULE Tasks Year 1 Year 2 Year 3 Year 4 Years Weeding Quarterly Quarterly Quarterly Biannually Biannually Trash removal Monthly Quarterly Quarterly Quarterly Quarterly Qualitative monitoring Monthly Monthly Quarterly Quarterly Quarterly Quantitative monitoring None Spring Spring Spring Spring A. Implementation Monitoring The mitigation moiiitoring period will begin with initial site grading and will last for five years following completion of planting. To ensure that conditions of this restoration plan are adhered to, all implementation activities will be monitored and recorded by the project biologist. The biologist will be available on-site during revegetation implementa- tion to assist in making necessary plan modifications so the work may proceed. Records will include dates of translocation of salvaged species, container plantings, and seeding. These will be included in the first annual report. 12 B. General Maintenance Procedures General maintenance will begin following the installation of all plant materials. Maintenance tasks are anticipated to continue for five years. 1. Vegetation Clearing and Trash Removal Pruning of any native vegetation or removal of dead wood and leaf litter shall not be allowed in the revegetation areas. Trash will be removed from the sites by hand on a monthly basis for the duration of the first year and quarterly thereafter. Trash consists of all man-made materials, equipment, or debris left within the restoration area that is not serving a function related to revegetation. 2. Weed Control Weed control will continue throughout the five-year monitoring period. Utility easements adjacent to or within the restoration areas will be included in weed control activities for the project. Hand weeding or other weed control methods will be performed by maintenance workers familiar with and trained to distinguish weeds from native species. Dethatching will be performed on an as-needed basis. During the first year, weeding will be performed quarterly (or more often as determined by the project biologist) to keep weeds from producing seeds and to control weed competition during the establishment period of native plants. Weed control will continue quarterly for years two and three and twice a year or as needed in years 4 and 5. Weeds will be killed or removed before they set seeds. Appropriate weed control measures will be implemented under the direction of the project biologist. A Ust of exotic species anticipated on the site is presented in Table 5. In the event that additional invasive species are encountered, the project biologist shall refine control measures to address the problem. 13 TABLE 5 ANTICIPATED EXOTIC SPECIES Scientific Name Common Name Arundo donax Giant reed Cynara cardunculs Artichoke thistle Brassica nigra Mustard Cortaderia selloana Selloa pampas grass Erodium sp. Filaree, storksbill Avena barbata Wild oats Foeniculum vulgare Sweet fennel Nicotiana glauca Tree tobacco Ricinus communis Castor bean Raphanus sativus Wild radish 3. Irrigation The irrigation will be applied at the discretion of the project biologist. The irrigation schedule will vary depending on weather patterns. Irrigation systems will be maintained throughout the five-year maintenance period. The addition of supplemental water to the mitigation areas will be gradually decreased and eventually discontinued prior to the end of the five-year monitoring period. C. Qualitative Monitoring Evaluating plant health and identifying and conecting problems are necessary for ensuring successful vegetation establishment. The site will be monitored weekly during site preparation, monthly for the first two years, and quarterly for the remainder of the project. The project biologist will review the restoration areas to examine transplant vigor, and exotic plant encroachment. The biologist will document the findings and make recommendations for remedial actions, if necessary. A list of plant and wildlife species observed on the restoration site will be compiled during each qualitative monitoring visit. A list of plant species present and a description of wildlife (including least Bell's vireo) use will be included with each annual report. D. Quantitative Monitoring Quantitative monitoring will be performed to measure development of vegetation in the restoration and enhancement areas and to document that the restoration areas achieve the success criteria as defined by the performance standards. 14 Beginning in year 2, permanent vegetation sampling stations will be established within each restoration site to measure year-to-year changes in shrub or tree cover, density, and diversity following the protocol of the California Native Plant Society Plant Communities Project (Sawyer and Keeler-Wolf 1995). This data will be compared to baseline data collected at reference sites in nearby native plant communities. Results will objectively demonstrate if the restoration and enhancement areas approach the community characteristics of the reference habitat. The CNPS sampling method is based on a 50-meter point transect centered on a 5x50- meter plot. Using this method, vegetation is sampled by the point method at 0.5-meter intervals along the 50-meter transect to determine cover. The surveyor will note the species encountered and classify its height (i.e., herb, shmb, or tree) at each interval. In addition, each shmb-sized individual of each perennial species growing in the 5x50-meter plot will be counted to determine shmb density and diversity. All annuals present in the 5x50-meter plot will also be noted. Sampling will be conducted in the spring so that the maximum species diversity will be recorded. At least three plots per mitigation area will be used to determine vegetation cover, plant community composition, vegetation density, and plant diversity. A photograph will be taken from each sample endpoint (toward the plot) each time the site is monitored to record the progress of mitigation over the monitoring period. E. Monitoring Reports Annual reports summarizing monitoring results will be submitted to CDFG, USAGE, and the City of Carlsbad by the project biologist by December 31 of each year. The quantitative report will include survey methods, data summary analysis, performance standards comparison, discussion, remedial action discussion, recommendations, and photodocumentation. Each annual report will compare findings of the cunent year with those in previous years. F. Performance Standards Restoration of the Calaveras Creek mitigation areas will be considered successful when the perfonnance standards have been met. If the minimum levels for any one of the measurements described below (Table 6) are not achieved in any year, the project biologist will implement remedial actions, such as replanting container stock, to reach the following year's expected levels. In order to meet the performance standards, the habitat must sustain itself for a minimum of one year (meeting the fifth-year performance standai'ds) in the absence of significant maintenance measures any year during the five- year monitoring period. Significant maintenance includes replanting and eradication of 15 weed infestations. Other maintenance measures, such as minor weed control, may continue until the end of the monitoring period. TABLE 6 FIVE-YEAR PERFORMANCE STANDARDS Transplant/ Container Total Native Density as a Percentage Diversity as a Percentage Year Plant Survival Plant Cover of Reference Area Values of Reference Area Values 1 80% 2 - 50% 50% 50% 3 - 75% 60% 60% 4 ~ 90% 70% 70% 5 ~ 90% 80% 80% 1. Tolerance of Weeds The cover of non-native annual grasses and herbs, such as brome grass or filaree, as identified by the project biologist, will be no more than 5 percent of that measured in the control sites during the monitoring period. For example, if non-native grasses and herbs composed 10 percent cover of a control site, 0.5 percent cover would be permitted on the mitigation site. No invasive exotic perennials, such as giant reed, pampas grass, and tree of heaven, will be pennitted on the revegetation sites. 2. Remedial Measures If performance criteria are not achieved at the end of the fifth year, the permittee will consult with CDFG, USAGE, and the City of Carlsbad to determine whether the mitigation effort is acceptable. The owner/project proponent understands that failure of any significant portion of the mitigation area may result in a requirement to replace or revegetate that portion of the site. G. Notification of Completion At the end of the fifth year, a final report will be submitted to the resource agencies evaluating the success of the mitigation. The report will make a determination of whether the requirements of the mitigation plan have been achieved. At the conclusion of the five-year monitoring period, or at such time the project has achieved the performance standards, the project biologist shall inform the owner/project proponent, CDFG, USAGE, and the City of Carlsbad. A site review will be scheduled for 16 all parties to review the revegetated sites. Upon confirmation of project success, the agencies shall release the owner/project proponent of all obligations. Reference Cited Sawyer, J. O., and T. Keeler-Wolf 1995 A Manual of Califomia Vegetation. Califomia Native Plant Society. Sacramento. 17 APPENDIX H Ground Level Photographs of the Wetland Resources on the Site AGUA HEDIONDA CREEK CROSSING 1 a. View easterly from the present temporary terminus of College Blvd., atthe El Camino Real Intersection. Note the Agua Hedionda riparian corridor in the background. 1 b. View of the Agua Hedionda Creek from the east. Note existing College Blvd. running downhill to El Camino Real. 10. View easterly of Agua Hedionda Creek riparian corridor at the location of the crossing. Key Map 1 e. Close-up view of the location of the Agua Hedionda Creek crossing. 1 d. View of the location of the Agua Hedionda Creek crossing. SHEET 1 CALAVERA CREEK CROSSING 2a. Westeriy view of the lower Calavera Creek riparian corridor. College/Cannon Intersection crossing to occur just to the right of the farmhouse buildings on the left. 2b. View of the Calavera Creek riparian corridor In the location of the 2c. Close-up view of the area of the future intersection as seen from future Intersection. the west. 2e. View of the riparian corridor crossing area for College/Cannon intersection as seen from the east side. Key Map 2d. Close-up view of the riparian corridor aossing area. SHEET 2 ROBERTSON RANCH WETLAND 3a. View of the northeriy part of the wetlands that will be taken for Cannon Road. 3b. View of the southeriy end of the wetlands that will be taken for Cannon Road. Key Map SHEETS LITTLE ENCINAS CREEK RIPARIAN 4a. Existing barricades at terminus of Cannon Road travelling westerly from Vista. 4b. View southeriy of existing Little Encinas Creek riparian corridor. Grading for Cannon Road will hug the foreground but encroach into riparian vegetation 4c. View westeriy of Little Encinas Creek Valley. Riparian corridor to the left. Cannon Road alignment to hug the hillside on the right. 4d. View easterly back toward Vista of Little Encinas Creek Valley Riparian encroachment area to occur on left edge of riparian corridor in this location. Key Map SHEET 4 EPHEMERAL "WATERS OF THE U.S." 5a. Ephemeral "Waters" in north end of Village U. Upper end of streamcourse on right hand side of photo to be taken in this area. 5b. Ephemeral "Waters" on east side of Village K. Upper end of streamcourse to be taken. Sc. Upper end of ephemeral "Waters" to be taken along ridgeline in Village W. 5d. Village H "Waters" just upstream of RV storage lot which had been slated for development, now proposed for preservation. Key Map SHEETS APPENDIX I Representative Cross Sections of Key Project Features 0 25 W SCALE: 1" = 100 PLAN SCALE: r = 100' PROPOSED GRADE CANNON RD.~-^ i eo 40~ •EXIST. GROUND SECTION 'A-A' SCALE: 1" = 100' HOR 1" = 100' VER BRIDGE AND THOROUGHFARE DISTRICT NO 4 PROJECT AND EIR STUDY CROSS SECTION ON PROPOSED CANNON RD THROUGH WETLAND AREA CONSULT A^N T S 5900 Posleur Court Suite 100 Corlsbod, Colifornio 92008 760-9J1-7700 Fox: 760-931-8580 oday®odayconsultants.com Civil Engineering Planning Processing Surveying B COUEGE BL REACH 'B' -V K Cri PLAN 0' 25' 100' 50^ 200' SCALE: r = 100' SCALE: 1" = 100' PROPOSED GRADE COLLEGE BLVD. PROPOSED GRADE Dkl BASIN BJB EXIST GROUND SECTION 'B-B' SCALE: /•= too'HOR 1" = 100' VER •EXISTING CREEK BRIDGE AND THOROUGHFARE DISTRICT NO 4 PROJECT AND EIR STUDY CROSS SECTION ON PROPOSED COLLEGE BL VD. AND DETENTION BASIN BJB CONSUL T A'^N T S 5900 Pasteur Court Suite 100 Corlsbod, Colifornia 92008 760-931-7700 Fax; 760-931-8680 oday®odayconsultonts.conn Civil Engineering Planning Processing Surveying CONSTRAINTS LIMITS RIPARIAN WOODLAND ^ "Z////////////ly\ \ \ li d// // ////ijjf] \ nu • //X))EGm dddf^kl^I! j l I l l '//d >SAGE' stRUB/WlT'S/ / / / / /\/ #/ / / ,/.// / / // // / / /' / / Ni r EXISTING LITTLE ENCINAS CREEK CL ' ./ / / / / / . •' / / / / / / / / / / /' / / / / / / / / .... - /" ./•"/// / // ^ / / / / / / / > m / / / / m / / / mv ^^'xyy/ / / / / / / / / / I SCALE: 1" = 40' -Q- DIEGAN COASTAL SAGE SCRUB LIMTS ROW ENVIRONMENTAL CONSTRAINT LIMITS RIPARIAN WOODLAND EIXISTING LTTLE ENCINA^ CREEK GL BUFFER 360 340 320 300 SCALE: 1" = 40' HOR 40' VER BRIDGE CROSS SECT lOeOUGHF^ PROPOSED 'mmEEMsm, ma 2191 EL CAUINO REAL. OCEANSIDE, CA. 32054 (780)722-3495 FAX (760)722-3490 •i\120\14\06\PLOTS\RETWALL.DWG 6-14-00 3i03i54 pn EST SCALE: 1" = 40' 113-1-00 114-hOO SECTION "D"°''D" SCALE: 1" = 40' HOR 1" = 40' VER BRIDGE D PRORLE O! T AND EIR STUI i ENGINEEMma, ma 2191 EL CAUINO REAL. OCEANSIDE, CA. 92054 (760)722-3495 FAX (760)722-3490 ••\iaO\14\06\XREFS\BRIDGEPRn.DWG 6-14-00 3i05i31 pn EST