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PLACEMENT AND SAMPLING OF ADDITIONAL EXPLORATORY SOIL BORINGS On September 30 and October 1 , 1993, Del Tech Geotechnical ' Support Services of Oakdale advanced nine ( 9) soil borings at the locations shown on Figure 2 . Each boring was advanced with a hand auger Discrete soil samples and a ' grab water sample were acquired from each borehole . Each soil sample was collected within a 1 9 inch diameter by 4 0 inch long clean brass sleeve fitted within a drive sampler lowered into the borehole to a point accessed by the hand ' auger . Upon being retrieved, the drive sampler was opened and the brass sleeve removed The ends of each sleeve were then covered with teflon sheeting/aluminum foil , fitted t with plastic caps , and sealed with duct tape Each tube was then marked and placed in an iced, insulated container for transportation to JL Analytical Services , Inc of Modesto , a California-state certified hazardous waste analytical laboratory, under chain of custody. Subsequent analyses were performed for Total Petroleum Hydrocarbons as Diesel (TPH-D) , Total Petroleum Hydrocarbons as Gasoline ' (TPH-G) , benzene, toluene , ethylbenzene, and total xylenes (BTEX) using EPA Methods 3550/8015 and 5030/8015-8020 , respectively , and for Total Oil and Grease (TOG) using SM 5520 D&F. Grab water samples from each boring were acquired within a clean, disposable polyethylene bailer lowered into the bore ' hole to a point just below the surface of the water Upon being returned to grade , the contents of each bailer were transferred into four Volatile Organic Analysis `(VOA) vials ' and two amber glass liter bottles Each container was promptly covered with a teflon-lined screw cap , labeled, and placed in an iced, insulated container for trans- portation to JL Analytical Services under chain of custody . Subsequent analyses were performed for Total Petroleum Hydrocarbons as Diesel (TPH-D) , Total Petroleum Hydro- carbons as Gasoline (TPH-G) , benzene, toluene, ethyl - benzene, and total xylenes (BTEX) using EPA Methods 3510/ 8015 and 5030/8015-8020 ( 602) , respectively, and for Total Oil and Grease (TOG) using SM 5520 B&F ' The soil profile encountered while advancing boring SBR-1 consisted of 3 inches of asphalt underlain by inorganic , ' moist , greenish-gray clay exhibiting an odor consistent with that of oil to 1 foot . Slightly moist , inorganic dark-colored clay exhibiting a slight odor of oil odor was present to 2 feet This was underlain by slightly moist , plastic , inorganic light-brown clay to approximately 4 feet . Moist , plastic , inorganic gray clay with greenish streaks was encountered between approximately 4 . 5 and 7 feet Beneath this layer was moist , plastic , olive colored inorganic clay becoming very moist at 8 . 25 feet . The soil Page 4 r -