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�E I� LEVINE•FRICKE 9.2 Northeast Area Soil and/or ground-water samples were collected for chemical analysis from a total of 13 soil borings in the vicinity of the Quonset hut, the former underground gasoline tank location, and t the above-ground diesel tanks located in the northeast corner of the Site (Figure 4) . (Four additional shallow soil samples were collected in this area, but were held by the laboratory pending ` the results of the other samples) . Samples were collected in this portion of the Site to assess whether analyses results E indicate significant releases of pesticides acid/or fuel hydrocarbons have occurred related to past activities. Selected northeast area soil borings. were tested for methane gas and/or fuel hydrocarbons using a portable OVA. . l Soil and ground-water samples were collected from four deeper borings located near the above ground storage tanks and former underground gasoline tank site to evaluate whether fuel spillage and/or possible release of gasoline stored inathe underground tank in that portion of the Site have affected soil or ground water. These borings were drilled using Hollow stem auger equip- ment to depths of approximately 10 to 18 feetbelow grade. Soil samples were collected from approximately][0.5 ;to 3 feet below grade at WS-4, WS-5, and WS-6 for chemical analysis. Ground- , water samples were collected from boringsJJWS-4, WS-5, WS-6 and WS-7 for chemical analysis. This methodology is a reconnaissance method designed to assess the possible presence of analytes in water samples collected, but does not necessarily produce quantitative results. Quantitative results upon which to base interpretations would require instal- lation, development and sampling of ground-water monitoring wells to obtain representative ground-water samples. I� 9.3 Northwest Boundary I� Ground-water samples were collected from three (3) soil borings located along the northwestern Site boundary, :GWSI, GWS2 and GWS3 (Figure 3) . Discarded equipment, vehicles, and containers, including various 55-gallon drums, were observed by Levine-Fricke personnel on the property adjacent to and 'northwest of the Site (the Tsatsui property) during a drive-by inspection of the vici-- nity of the Brookside Ranch on October 19il 1988. The purpose of ti the ground-water sampling and analysis was therefore to evaluate the possibility that chemicals have migrated on to the Site via shallow ground water from the Tsatsui property. The soil borings I� along the northwest boundary of the Site were .6also screened for the presence of methane using a portable OVA. . . The three borings were drilled to approximate :depths of 10 to 15 below grade using hollow stem auger drilling equipment, Ground- li -13-