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• ` 15 September 1999 <br /> AGE-NC Project No 98-0592 <br /> Page 5 of 7 <br /> 42 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> Organic vapor was detected in soil sample duplicates collected from B1(MW-1) and B2 utilizing a <br /> OVM at concentrations as high as 1,600 milligrams per kilogram(mg/kg)and 7 mg/kg,respectively <br /> Organic vapor was not detected in other soil boring duplicate samples Field indications of petroleum <br /> hydrocarbon impact to ground water were not observed during grab ground water sampling <br /> 43 GROUND WATER ELEVATION AND GRADIENT <br /> Ground water grab samples were collected from approximately 49 7 feet bsg from B I and from <br /> approximately 50 feet bsg from borings B2 and B5 Ground water monitoring data from an adjacent <br /> property (Cherokee Truck Stop) and a review of the regional ground water elevation map published <br /> by San Joaquin County indicated that the ground water flow direction is generally toward the <br /> northeast <br /> • <br /> 44 RESULTS OF SOIL SAMPLE ANALYSIS <br /> TPH-g was detected in soil sample B1-40' at a concentration of 16 mg/kg Additionally, BTEX <br /> compounds were detected in sample B 1-40' at concentrations as high as 20 mg/kg The fuel <br /> oxygenate MTBE was detected at concentrations of 3,400 micrograms per kilogram (ug/kg) and 67 <br /> ug/kg in samples B1-30' and 132-30', respectively TPH-d and TPH-mo were not detected in the soil <br /> samples analyzed <br /> Analytical results of soil samples are summarized in Table 5 The laboratory reports and chain-of- <br /> custody forms are included in Appendix B <br /> 45 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> A total of three grab ground water samples were submitted to DHS-certified laboratories for analysis <br /> TPH-g was detected in the ground water sample collected from boring 131, at a concentration of <br /> 2 400 micrograms per liter (ug/1) TPH-g was not detected in the grab ground water samples B2-W <br /> and B5-W collected from borings B2 and B5 <br /> Utilizing EPA Method 8020, BTEX compounds were detected in grab ground water samples <br /> collected from B 1 and B2 at concentrations as high as 170 ug/l and 1 7 ug/l, respectively BTEX <br /> compounds were not detected in sample 135-W <br /> Atli anced GeoEmiron mental Inc <br />