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{ <br /> SECOR <br /> JN 40007-097-01 PAYMENT'RECEIVED� Internataonallncorporated <br /> November 6 19.96 SAN <br /> CC R 1nBLIC t, r }fir cq <br /> Ms. Margaret Lagorio <br /> San Joaquin County <br /> Environmental Health Division <br /> 300 East Weber Avenue, 3rd Floor <br /> Post Office Box 388 <br /> Stockton, California 95201-0380 <br /> f <br />` WORK PLAN FOR THE INSTALLATION OF THREE F <br /> GROUNDWATER MONITORING WELLS AND ONE SOIL BORING <br /> Dear Ms. Lagorio: s <br /> On behalf of ARCO Products Company, SECOR International Incorporated (SECOR) is <br /> submitting this Work Plan to install three groundwater monE6itoring wells and to drill one soil <br /> boring at the site in conjunction with a geotechnical investigation. The wells will be installed <br /> in soil borings SB-1, SB-3, and SB-4 (see Figure 3). The aforementioned soil borings will be <br /> completed as 2-inch diameter temporary groundwater monitoring wells and will be advanced <br /> to five feet below the encountered groundwater. <br /> The soil boring SB-2 will be advanced for geotechnical ur poses and to collect a groundwater <br /> P P <br /> sample. Following the collection of all soil and groundwater samples, the soil boring will be <br /> abandoned by gravity installation of bentonite chips with the aid of a conductor pipe or, by <br /> pouring a concrete/bentonite slurry mix into the soil boring via a-tremmie pipe. <br /> The rationale for the proposed soil boring locations is to provide at least one soil boring at <br /> or near the4ocation of each proposed structure. It is anticipated that a seismic liquefaction <br /> evaluation 'will be required for civil engineering design.- The depth of the subsurface <br /> explorations will be 30 to 50 feet. Although the groundwater surface is anticipated to be 25 <br /> feet below ground surface (bgs), the seismic liquefaction analysis requires standard <br /> penetration tests to extend a minimum of 50 feet bgs in at least one soil boring. <br /> Soil and groundwater samples will be analyzed for total petro_leum hydrocarbons (TPH)using <br /> EPA 8015, .BTEX using EPA 8020, and MTBE (modified EPA 8020).. Two groundwater <br /> samples will be analyzed for solvents using EPA 8260. <br /> All soil cuttings and decontamination water will be placed in 55-gallon drums and stored <br /> onsite,for subsequent disposal. <br /> 25864-F Business Center Drive;Redlands, CA 92374-4515 (909_)335-6116 (909)335-6120 FAX <br />