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1 <br /> ENVIRONMENTAL CONSULTING & MANAGEMENT ENIVIFaON 1r—NTgL HEALTH <br /> F10LDC/�S90CWTFS i1U t•�i� ,�rt ''Lff�r <br /> _ G) <br /> 1855 GATEWAY BOULEVARD � JULSUITE 770 7 UL `9 PM L: 5 5 <br /> CONCORD CALIFORNIA 94520 510 602-2333 FAX# 510 687-1258 <br /> June 30, 1993 <br /> Mr Charles Carmel <br /> 1 <br /> ARCO Products Company <br /> P.O. Box 5811 <br /> San Mateo, California 94402 <br /> LEMTED SUBSURFACE INVESTIGATION <br /> ARCO FACILITY NO. 2130 <br /> 7906 N. ELDORADO STREET, STOCKTON, CALIFORNIA <br /> Dear Mr. Carmel. <br /> This letter report presents the results of a limited subsurface investigation conducted on May 5, <br /> 1993, at ARCO Products Company (ARCO) Facility No 2130, located at 7906 N El Dorado <br /> Street, Stockton, California (Site, Figure 1). The purpose of the investigation was to determine <br /> if petroleum hydrocarbons are present in soil north of the pump islands where ARCO is <br /> considering installing new underground storage tanks. Roux Associates (Roux) dulled two soil <br /> borings to a depth of 26 ft below ground surface (bgs) (Figure 2). Undisturbed soil samples <br /> were collected from each of the boreholes for laboratory analysis <br /> Methods of Investigation <br /> The soil borings were drilled by Wayne Drilling Company, a contractor licensed in the state of <br /> California as a Water Well Driller (C-57 No. 376345), using a CME-75 drill rig equipped with <br /> 8-inch outside diameter, continuous flight, hollow stem augers. <br /> Samples for soil characterization and laboratory analysis were collected in the boreholes by <br /> driving a 21h-inch diameter, 18-inch long, California Modified, Split Spoon Sampler ahead of <br /> the auger. The California Sampler contained three clean 2-inch diameter, 6-inch long, stainless <br /> steel liners. The number of blows to drive the sampler each 6 inches were counted and recorded <br /> on the geologic logs (attached). <br /> One stainless steel liner from each California Sampler was retained for possible laboratory <br /> analysis. Immediately after the sampler was recovered from the borehole and opened, the ends <br /> of one liner were covered with aluminum foil and plastic end caps. The ends were then wrapped <br /> with duct tape. Each sample was labeled with the Site location, date, time, identification code, <br /> and sampler's initials Each sample was placed in a plastic bag and stored on ice in a closed <br /> cooler chest while in transit to the laboratory. Chain-of-Custody documentation was maintained <br /> for all samples. <br /> Doc #A158W01 1.6 <br />