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Subsurface Investigation 315 Enterprise Place <br /> January 13, 2000 Tracy, California <br /> TABLE 1 <br /> RESULTS OF SAMPLE ANALYSES <br /> SAMPLES FROM BORINGS <br /> 315 ENTERPRISE PLACE <br /> TRACY, CALIFORNIA <br /> Sample Depth TPHg Benzene Toluene Ethyl Total TPHd <br /> Number in Ft benzene Xylenes <br /> Soil Samples <br /> (T1)S1-8 8 <1.0 <0.005 <0.005 <0.005 0.009 1,190 <br /> (T1)S2-10 10 3.84 <0.005 <0.005 0.010 0.041 2,140 <br /> T2-11 11 21.0 <0.005 <0.005 <0.005 0.009 881 <br /> T3-10 10 22.8 <0.005 <0.005 <0.005 0.008 1170 <br /> T4-11 11 17..1 <0.005 <0.005 <0.005 <0.005 848 <br /> T5-10 10 <1.0 <0.005 <0.005 <0.005 <0.005 <1.0 <br /> T6-11 11 <1.0 <0.005 <0.005 <0.005 <0.005 <1.0 <br /> T7-11 11 <1.0 <0.005 <0.005 <0.005 <0.005 <1.0 <br /> T8-10 10 <1.0 <0.005 <0.005 <0.005 <0.005 <1.0 <br /> T9-10 10 <1.0 <0.005 <0.005 <0.005 <0.005 <1.0 <br /> Water Samples <br /> GW-1 10 4.0 <0.005 <0.005 0.011 0.0448 508 <br /> T5-W-G <0.050 <0.0005 <0.0005 <0.0005 <0.0005 <0.250 <br /> T8-S <0.050 <0.0005 <0.0005 <0.0005 <0.0005 <0.250 <br /> Concentrations reported in mg/kg or mg(l (parts per million) <br /> TPHg= Total petroleum hydrocarbons as gasoline <br /> TPHd=Total petroleum hydrocarbons as diesel <br /> <=Less than laboratory minimum detection limit(MDL) <br /> ND =Not Detected <br /> 3.0 CONCLUSIONS <br /> Up to 1,190 to 2,140 ppm TPHd was found in the soil onsite, up to 508 ppm TPHd <br /> was found in the groundwater. Only low to non-detectable concentrations of BTEX <br /> compounds were reported. The extent of contamination appears to be limited to a zone <br /> approximately 140 ft in length(north to south) and approximately 60 ft to the east of the <br /> property line. We infer that similar contamination exists on the adjoining property to the <br /> west. <br /> If contamination is confined to a zone of approximately 3 ft in thickness over that <br /> area, approximately 935 cu yd of contaminated soil is present. If the average degree of <br /> contamination is 1,000 ppm, and a cu yd of soil weighs 3,000 pounds, approximately 2,805 <br /> 9015-025 -3- <br />