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On August 30, 1989? exploratory soil borings VTB-11 and VTB- <br />12 were advanced under the direction of Walter Floyd, Geologist, <br />and Helen Mawhinney, Environmental Specialist, by staff of <br />Spectrum Exploration, Inc. of Stockton, California utilizing <br />a four -Wheel drive drill rig equipped with an 8" outside <br />diameter, hollow stem auger. A soil sample was acquired from <br />VTB-11 using a brass tube placed within a California Modified <br />Split Spoon Sampler driven through the hollow stem of the <br />drilling auger(s) and handled in the manner previously described. <br />Groundwater was encountered at a depth of 25 in VTB-11 and <br />28' in VTB-12. Groundwater samples were acquired from each <br />boring as described above. Borings VTB-11 and VTB-12 were <br />also grouted with a Portland cement -53 bentonite mix. <br />From August 15, 1989 through August 30, 1989, all soil and/or <br />groundwater samples acquired on site were analyzed for the <br />constituents listed within Chart I using an uncertified liquid <br />to liquid extraction process. Based upon the results of these <br />analyses and upon observations made on site, selected samples <br />also as referenced in Chart 1 were then transported under chain <br />of custody to Chromalab, Inc., a certified hazardous Waste <br />analytical laboratory for analysis for Total Petroleum Hydro- <br />carbons as Gasoline (TP$ -G) using EPA Methods 5030/8015, and <br />Halogenated Volatile Organics using EPA Methods 5030/8010. <br />The results of field analyses and certified analyses are outlined <br />in the following chart: <br />CHART I <br />CERTIFIED ANALYTICAL RESULTS: <br />TPH-G TPH_D <br />Halogenated <br />Sample# <br />Material <br />Depth <br />(ppm) (PRD) <br />Compounds <br />VTB-1 <br />soil <br />13.5' <br />TPH--G- <br />1116 ppm <br />Benzene- <br />N.D. <br />Toluene - <br />2330 ppb <br />Total Xylenes - <br />4790 ppb <br />Ethylbenzene- <br />3830 ppb <br />VTB-4 <br />water <br />25' <br />N.D. N.D. <br />N.D. <br />VTB-3 <br />water <br />20' <br />----- ----- <br />Methylene <br />Chloride <br />r <br />1.7 ppb <br />3 <br />