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\SCEINWRC. <br /> May 12, 1997 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, Third Floor <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Reference: Workplan and Permits for Subsurface Investigation at the Bank of America Job <br /> Site Located at 234 West Main Street in Ripon, California. <br /> Versar Project No. 3622-500 <br /> Dear Sir: <br /> Versar, Inc. (Versar)will be conducting a subsurface investigation at the Bank of <br /> America Branch located at 234 West Main Street in Ripon, California(Site). The activities are <br /> being conducted as part of a property transfer assessment. The field work will be conducted in <br /> two phases. Phase I will consist of a soil gas survey of the Site employing up to 12 monitoring <br /> points. Air samples will be analyzed for total petroleum hydrocarbons as gasoline (TPH-G); <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX). Based on the results of the soil gas <br /> survey provided by an onsite mobile laboratory Versar will proceed to Phase 2. Phase 2 will <br /> consist of the drilling of three boreholes for the purpose of collecting soil and groundwater grab <br /> samples. <br /> The boreholes will be drilled to a depth of approximately 20 below ground surface (bgs) <br /> or to approximately five-feet below the static groundwater level at the Site. The boreholes will <br /> be drilled using a direct push sampling equipment. Samples will be collected at five-foot <br /> intervals to groundwater. The borehole will then be extended into groundwater and a <br /> groundwater grab sample will be collected. Soil and groundwater samples will be submitted for <br /> analysis to a California certified laboratory for TPH-G, TPH-diesel, BTEX, oil and grease, and <br /> LUFT 5 metals. <br /> HAPROIECTMOFATIPON.WP <br /> • SACRAMENTO OFFICE • <br /> 7844 MADISON AVENUE,SUITE 167•FAIR OAKS,CALIFORNIA 95628•TELEPHONE:(916)962-1612 FAX:(916)962-2678 <br />