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L Mr. Lloyd Gums A91701.OIB January 15, 1996 Page 6 LSoil borings B-3, B-4, B-5, B-6, B-7, and B-9 were drilled to a depth of approximately 21.5 feet BSG through the former UST excavation to collect data on the presence or absence of LPM in soil beneath the former UST locations. These soil borings were drilled using the CME-75, truck mounted, hollow-stem auger drill rig. Soil samples were collected from the bottom of each of these soil borings. LSoil borings HA-7, HA-8, and HA-10, were drilled to a depth of 5 feet BSG to collect data on the presence or absence of PPCs in the vicinity of the southwestern dispenser island(i.e. Lcorresponding to soil sample locations #7, #8, and #10 of April 22, 1994). These soil boring were drilled using a combination of the CME-70 and hand auger equipment. Soil samples were collected from the bottom of each of these soil borings. L After completion of the soil sampling, the soil borings were abandoned by backfilling with L a cement slurry consistent with our SOPs. The slurry was pumped through the annulus in the hollow-stem augers. Backfill was placed in one continuous operation from the bottom to the top of the borehole. When the annulus/borehole filled with the slurry, auger flights i were removed (no more than 10 feet at a time) from the borehole, allowing the slurry to uniformly fill the borehole to the surface. Drill cuttings from the soil borings and rinsate from the decontamination of drill tools were sealed in United States Department of Transportation (DOT)-approved 55-gallon drums, labeled, and stored on site in the area shown in Drawing 3. Disposal of this material is addressed in Section 8.0 Recommendations. Final disposal/treatment of these materials is the responsibility of the Lclient. 4.3 Laboratory Testing Progmm: Soil samples collected from soil borings B-1, B-2, B-8, HA-7, HA-8, and HA-10 were chemically analyzed in the laboratory for the following key PPCs:benzene,toluene,ethylbenzene, and xylenes (BTEX),total petroleum hydrocarbons- gasoline range constituents (TPH-G), and total petroleum hydrocarbons-diesel range constituents (TPH-D). Soil samples collected from soil borings B-3, B-5, B-6, and B-7 were analyzed in the laboratory for BTEX and TPH-G. Soil samples collected from soii borings B-4 and B-9 were analyzed in the laboratory for TPH-D. Preparation and analytical L methods for the laboratory analyses and corresponding detection limits for reporting purposes are summarized in Table 2. L