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'F Interim Invests ation Re=prt August 17, 1996 Marci's Diesel Service Side Stockton, California !I ,,,, 1 1 1 Current Investigation U A Workplan for this phase of the investigation was submitted to and accepted by the San Joaquin County Public Health Services Environmental Health Division Although the workplan proposed installing at least three vent wells, this phase of our site Investigation was limited to drilling one exploratory boring through the middle of the former tank excavation to determine whether construction of the wells is warranted 2.0 SOIL BORING ' Soil boring LB 1 was drilled to a total depth of 80 ft below the ground surface using a Mobile B-81 drilling rig, equipped with 8-in-diameter, continuous-flight, hollow-stem augers roperated by V & W Drilling of Rio Vista, California The auger flights were steam-cleaned prior to use to minimize the possibility of contamination Samples were described using the Unified Soil Classification System (Figure B-1), descriptions of the materials encountered are presented on the Log of Boring in Appendix B (Figure B-2) During drilling, soil samples were collected at 5-ft vertical intervals using a California- modified, split-spoon sampler equipped with clean brass sleeves The number of blows required to drive the sampler each successive 6-in interval was counted and recorded to give an indication of soil consistency Samples were collected by advancing the boring to a point immediately ' above the sampling depth, then driving the sampler into the native soil through the hollow center of the auger The sampler was driven 18 ins with a standard 140-1b hammer dropped 30 ins ' Drill cuttings were sealed in 55-gallon drums and left at the site pending the results of analyses Disposal of the soil remains the responsibility of the client Lush Geosciences can ' arrange to have the soil removed to an appropriate disposal facility or for treatment of the soil to reduce the contaminant levels with the authorization of the client rSoil samples from each interval were sealed with Teflon tape, plastic end caps, and duct tape The samples were labeled and placed in iced storage prior to pickup by the analytical laboratory Soil samples were selected for chemical analysis from each sample depth below the bottom of the tank excavation A Chain of Custody Record was initiated by the field geologist ' and accompanied the samples to the laboratory A copy of this record is presented in Appendix C was analyzed for Total Petroleum Hydrocarbons as gasoline and 1 Each of the soil samplesy Y diesel using Environmental Protection Agency (EPA) Method 8015 (modified) with purge and I rtrap EPA Method 5030 and for volatile gasoline constituents BTEX using EPA Method 8020 with purge and trap EPA Method 5030 Soil samples were analyzed by Excelchem Environmental I ' 524-001 - LUSH GEOSCIENCES —- .tea. �+ •ti -- ---