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Home My WebLink About3338; Agua Hedionda & Calavera Creek Dredging; Calavera Hills Phase II/Aqua Hedionda Channel Dredge; 2007-09-18Annual Mitigation Monitoring Report (Year 2) for Calavera Hills Phase II Master Plan, City of Carlsbad, California Prepared for McMillin Companies 2750 Womble Road, Liberty Station, Point Lwna San Diego, CA 92106 Contact: Mr. Don Mitchell Prepared by RECON Environmental, lnc. 1927 fifth Avenue San Diego, CA 921 01 -2358 P 61 9.306.9333 F 61 9.308.9334 RECON Number 3225-1 B September 18.2007 7 Gerald A. Scheid, Senior Biologist Annual Mitigation Monitoring Report (Year 2) for Calavera Hills Phase II Master Plan TABLE OF CONTENTS 1.0 Introduction 2.0 Project Information 2.1 Compensatory Mitigation Site Information 2.2 Remedial ActiindMaintenance of Mitigation Site 3.0 Summary of Year 2 Monitoring 4.0 Recommended Remedial Measures 5.0 Reference Cited FIGURES Regional Location Location of Mitigation Sies and Photo Location Points at Catavera Creek TABLES Summary of Project Impacts on Waters of the U.S. Standard Success Criteria Functional Success Criteria Native Plants for Remedial Areas Riparian Understory Seed Mix PHOTOGRAPHS View Looking North from South End of Eastern Mitigation Site View Looking Swth from North End of Eastern Migation Site View Looking South from North End of Western Mitigation Site View Looking Northeast Across Center of Western Mitigation Site RECQN Annual Mitigation Monitoring Report (Year 2) for Calavera Hills Phase II Master Plan 1.0 Introduction This report is the second annual report for the mitigation sites established as part of the Calavera Hills Master Plan Phase II project. The repod presents project information, mitigation site information, and results of the second year of monitoring postconstruction. Compensatory mitigation described in this reporl was required for impacts to jurisdictional waters of the U.S., including wetlands, incurred by the development project and apprwed by the resource agencies. 2.0 Project Information Project Name: Calavera Hills Master Plan Phase II and Bridge and Thoroughfare District No. 4, and Detention Basins. Applicants: Calavera Hills, LLC Mr. Don Mihell 2750 Womble Road Liberty Station, Point Loma San Diego, CA 921 06 61 9-794-1 252 Ci of Carlsbad Mr. David Hauser 1635 Faraday Avenue Carlsbad, CA 92008 760-602-4626 Corp Permit # : File #2001-0021 S-RLK Project Impacts: TABLE 1 SUMMARY OF PROJECT IMPACTS ON WATERS OF THE U.S. Prq& lrnm (acres) Total Rparian Fres-r Cismontane Total Non-Wetland pmjm Woodland Marsh AlWi Marsh Wetland Wate~ Waters Mponent Perm Tmp Perm Temp Perm Tmp Perm Temp Perm Temp Calarera Mls 0.1 0.1 0.2 Pb !I Cannon Rd. 0.m 0.08 Reach 3 Cdlege Ave. 0.04 0.05 0.09 0.03 0.06 Reach A leg^^ 0.01 0.01 0.13 I~rsection TOTAL 0.05 0.0 0.05 0.0 0.18 0.0 0.28 0.0 0.36 0.08 Pm = permanent; Terrp = temporary. Date Project Cowbudion Commenced: December 2002. Page I Annual Mitigation Monitoring Report (Year 2) for Calavera Hills Phase II Master Plan Project Location: The Calavera Hills Master Plan Phase II project is located in the northeast quadrant of the city of Carlsbad. The 814acre Calavera Hills Master Plan development area is bounded by the Oceanside city limits along with State Route 78 (S8-78) on the north and the southern boundary being approximately one-hatf of a mile north of the Rancho Carlsbad Mobile Home Park. The master plan's western extent is near Carlsbad Village Drive and the easterly boundary is just west of Calavera Lake. The project includes the proposed extensions of College Boulevard and Cannon Road, which are generally southeast of the master plan area. Latitude - Longitude: The project is IOcafed at approximately 33 degrees 10 minutes north latitude and 1 17 degrees 17 minutes 30 seconds longitude. Compensatory Mitigation Site Information The mitigation sites are located omsite along Calavera Creek (figures 1 and 2). The mitigation sites on Calavera Creek will widen the existing creek channel to create 7.4 acres of additional wetland. In all creation areas the existing non-native vegetation will be replaced with either southern willow scrub, freshwater marsh, cismontane alkali marsh, or a combination of these habitat types. Where appropriate, the southern willow scrub vegetation will be augmented with riparian forest (e.g., western sycamore), riparian woodland (various native willow species), and Akali marsh species (e.g., spiny rush, yerba mansa, &grass). These mitigation sites will add to and enhance the current riparian mosaic that supports least Bell's vireo along Calavera Creek. Impacts to jurisdictional wetlands and non-wetland jurisdictional waters will be mitigated by the creation of 7.4 acres of wetlandlriparian vegetation along Calavera Creek Three habiiat types will be established: southern willow scrub, freshwater marsh, and alkali marsh. Southern willow scrub is a riparian community found along major drainages but occurs in small drainages as well. Typical southern willow scrub species occurring on the project site include arroyo willow (Salix IasioIepk), Mack willow (Salix gooddingii), mule fat, western sycamore, western ragweed (Ambmia psiIos&chya), blue elderberry (Sambucus mexicana), and others. Freshwater marsh is on the site and is comprised of cattail (TypAa sp.). Alkali marsh is a community that is adapted to salindalkaline soils that are maintained by wet winter/spring and dry summerlfall conditions. Plant species that occur in this habitat type an the site include spiny rush, yerba mama, and saltgrass. Wetland creation will be accomplished by widening the existing floodplain of Calavera Creek up to an additional 150 feet and lowering the land adjacent to the creek a few feet. Native species will be introduced using rooted clrttings and seeds, as well as nursery- grown container st&. Page 2