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Western Regional Operations <br /> EA ENGINEERING, 41 Lafayette Circle <br /> SCIENCE, AND Lafayette,California 94549 <br /> TECHNOLOGY, INC. (415)283-ion <br /> 26 January 1988 <br /> �J <br /> Laurie L. Cotulla <br /> San Joaquin Local Health District I, q! <br /> 1601 E. Hazelton Avenue <br /> Stockton, California 95201 CNNii'OMI .TAL HEALTH <br /> RE: Proposed Protocol For Well Installation ( B.M 11/SERVI CES <br /> and Sampling At EXXON Retail Site 7-3942 <br /> 4444 N. Pershing Avenue, Stockton, CA <br /> Dear Ms . Cotulla: <br /> F xxo^ <br /> EA Engineering, SC' ce, and Technology, Inc. (EA) has been <br /> retained by . . . Inc. to investigate the extent of soil <br /> and/or ground water contamination off-site the former EXXON <br /> Retail Site 7-3944,'8, located at 4444 N. Pershing Avenue, <br /> Stockton, California. To determine the extent and level of <br /> potential ground water and soil contamination, installation of <br /> four, off-site monitoring wells are proposed. Proposed well <br /> locations are shown in Figure 1 . <br /> In accordance with San Joaquin County and California Regional <br /> Water Quality Control Board guidelines for monitoring underground <br /> storage tanks for hazardous substances, the holes will be drilled <br /> to a depth of approximately 30 feet--20 feet below the estimated <br /> static water level or, if dry, to a maximum of 45 feet. However, <br /> if at least 5 feet of competent clay exists below the water <br /> table, the wells will be terminated 1 to 2 feet into this clay. <br /> The bore holes will be drilled with a hollow-stem auger. All <br /> soil cuttings will be placed in 55-gallon drums and remain on <br /> site until after soil analysis has determined the total petroleum <br /> content of the soil . During drilling, soil samples will be <br /> collected every 5 feet from 5 feet below the surface to the total <br /> depth of the bore hole, using a California modified split spoon <br /> sampler with brass liner. Between samples the downhole equipment <br /> will be steam-cleaned or washed with a trisodium phosphate <br /> detergent and then rinsed with tap water, and distilled water. <br /> All soil samples will be screened for hydrocarbon content with an <br /> organic vapor analyzer (OVA) . After collection and screening, <br /> the sample will be capped with aluminum foil and PVC caps, placed <br /> on ice, and shipped to a state-certified analytical laboratory <br /> within 24 hours. The soil samples collected from just above the <br /> water table and samples with detectable fuel contamination will <br /> be analyzed for total petroleum hydrocarbons (TPH) and selected <br /> volatile gasoline constituents (VOA) , using modified EPA 8015, <br /> 8010, 8020, 8240, 602, and GC-FID methods as appropriate. Soil <br /> borings will be logged by a supervising geologist and described <br /> according to the Unified Soil Classification System. <br /> EXX10: 73R <br /> BALTIMORE 0 CHICAGO 0 CINCINNATI 0 LINCOLN 0 NEW YORK 0 SAN FRANCISCO <br />