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California Regional Water Quality Control Board <br />Central Valley Region <br />Karl E Longley, ScD P.E.> Chair - <br />- <br />Linda S. Adams. <br />Secretary for <br />Environmental <br />Protection <br />28 November 2007 <br />Sacramento Main Office <br />Internet Address: http://www.waterboards.ca.gov/centralvalley <br />11020 Sun Center Drive #200 Rancho Cordova, CA 95670-6114 <br />Phone (916) 464-3291 Fax (916) 464-4797 <br />Mr. Nathan Crum <br />Valley Pacific Petroleum Services, Inc. <br />166 Frank West Circle <br />Stockton, CA 95206 <br />M <br />CELI\ �JGovernor <br />t�pchwarzenegger <br />Il � No+J � p 2007 <br />EN�IRON� SERV CES N <br />pER�,11 . <br />WORK PLAN FOR MONITORING WELL INSTALLATION AND FEASIBILITY STUDY, <br />VALLEY PACIFIC PETROLEUM SERVICES, INC., 930 VICTOR ROAD, LODI, SAN <br />JOAQUIN COUNTY <br />Regional Water Quality Control Board - Central Valley Region (Regional Water Board) staff <br />reviewed the 10 September 2007 Work Plan for Monitoring Well Installation and Feasibility <br />Study (Work Plan) submitted by Ground Zero Analysis, Inc. (GZA) on behalf of Valley Pacific <br />Petroleum Services, Inc. (Valley Pacific) for the service station site (Site) at 930 Victor Road in <br />Lodi. Petroleum is stored at the Site in both underground and above ground storage tanks. <br />The Work Plan was submitted in response to our 25 July 2007 letter in which we requested <br />that by 4 September 2007, Valley Pacific submit a Feasibility Study (FS) Work Plan to <br />evaluate and select a technically and economically feasible method to clean up the soil and <br />groundwater at the Site. We specified that the FS work plan must include provisions for <br />defining the extent of soil contamination and groundwater pollution north and east of the <br />source area by installing wells in this area. <br />In the Work Plan Valley, Pacific proposes to install two groundwater monitoring wells north <br />and east of the source area to 65 feet below ground surface (bgs). Soil samples will be <br />collected from the borings at five-foot intervals starting at 35 feet bgs. Depth to groundwater <br />ranges from about 45 to 55 feet bgs. Select soil samples will be submitted for laboratory <br />analysis for Site constituents of concern (CDCs), including EPA Method 8021 B for benzene, <br />toluene, ethylbenzene, and xylenes (BTEX), EPA Method 8015M for total petroleum <br />hydrocarbons as gasoline (TPHg) and diesel (TPHd), and EPA Method 8260M for gasoline <br />oxygenate additives. <br />The wells will be screened from 45 to 65 feet bgs and will be named MW -12 and MW -13. <br />Following installation, development, and purging of the two wells, groundwater samples will be <br />collected and submitted for laboratory analysis for the same analytical suite as the soil <br />samples. <br />Valley Pacific will prepare an FS to select a remedy for free, sorbed, and dissolved phase <br />product in soil and groundwater. The FS will be prepared pursuant to the FS outline provided <br />by the Regional Water Board staff in our 25 July letter. <br />California Environmental Protection Agency <br />0* Recycled Paper <br />