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California Reponal Water Quality Control Board0:1 <br /> Central Valley Region <br /> v Robert Schneider,Chair <br /> Alan C.Lloyd Ph.D. Sacramento Main Office Arnold Schwarzenegger <br /> Secretary for Intemet Address; http://www.waterbouds.ca.gov/centralvalley Governor <br /> Environmental 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Protection Phone(916)464-3291 Fax(916)464-4797 <br /> 16 February 2006 <br /> Mr. Thomas Bauhs Ms. Kitty Walker <br /> Chevron Environmental Management Company Stockton Department of Housing &Redevelopment <br /> P.O. Box 6012 305 North EI Dorado Street, Suite 200 <br /> San Ramon, CA 94583-0904 Stockton, CA 95202. <br /> WORK PLAN REVIEW, SOUTH SHORE PARCEL 2A,666 WEST WEBER AVENUE, <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board(Central Valley Water Board) <br /> reviewed the 24 January 2006 Additional Soil Vapor Sampling Work Plan Delta View Apartments (Work <br /> Plan) submitted by EarthTech on behalf of the L&M Operable Unit, 666 West Weber Avenue, Stockton <br /> (site).. The site is a portion of Area 2A belonging to the City of Stockton Redevelopment Agency (RDA) <br /> as identified within the City's 13 September 2000 Environmental Master Plan. Chevron Environmental <br /> Management Company (Chevron) is conducting cleanup at the site on behalf of itself and any and all the <br /> other responsible parties. The scope of work contained in the Work Plan states: <br /> • "Install a soil gas probe (SV-26) in the vicinity of former soil gas location SV-25 to a depth of five <br /> feet below ground surface (bgs); <br /> • Install 3 additional soil gas probes (SV-27, SV-28, SV-29) approximately 10 feet out radially in a <br /> triangular pattern from SV-25 to a depth of five feet bgs; <br /> • Collect and analyze soil vapor samples for H2S [hydrogen sulfide] by ASTM Method D-5504, and <br /> for methane by ASTM Method D-1946, and provide QA/QC data to verify the quality of the data; <br /> and <br /> • Summarize the results in a letter report submitted to RWQCB." <br /> Central Valley Water Board staff concur with the elements of the Work Plan and Chevron should <br /> proceed with its implementation. If you have any questions regarding this letter or need additional <br /> information,you may contact me at (916)464-4682 or by email at mserra(cbwaterboards.ca.gov. <br /> MARY SIRRA <br /> Private Sites Cleanup Unit <br /> cc list; see next page <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />