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s <br /> r• <br /> 4 <br /> _ q <br /> May 10, 1987 AGS 86103-2 <br /> ti Cardlock Station #27 -- Stockton, California <br /> �Y <br /> subjective evidence of hydrocarbon contamination. Ground water <br /> was encountered at approximately 40 feet in the borings. The <br /> �.f <br /> M cuttings generated from the drilling operations were covered with <br /> plastic and left on site for later disposal. <br /> Two shallow soil borings, B-4 and B-5, were located in the tank <br /> t backfill with hand augering equipment. Soil samples S-12-B4 and <br /> S-12-B5 were collected from clayey native soil immediately below <br /> ;. the tank backfill. Boring B-4 was located adjacent to the fill <br /> 4' port of the diesel product storage tank, and B-5 was placed <br /> Y immediately to the north of the tank. The borings were <br /> backfilled with the cuttings generated during boring operations. <br /> +'Y <br /> 3� The soil materials <br /> .,A. penetrated were described continuously during <br /> <<�.r <br /> augering (plates 13 and 14) . Soil samples were collected at the <br /> A.- base of these borings by driving a laboratory-cleaned brass <br /> sample sleeve into the auger bucket immediately after the soil <br /> Sy/s was brought to the surface. The sleeve was then removed from the <br /> ' auger and prepared for transport to the laboratory. <br /> k . <br /> Soil samples collected for potential chemical analygis were <br /> sealed in their brass sleeves with aluminum foil, plastic-caps <br /> ac <br /> and air=tight tape. They were then labeled and placed in iced - <br /> 1"V <br /> ced - <br /> 1 { <br /> 5 BQp10996 <br />