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3 .5 Water Sample Collection and Analysis <br /> On August 16, 1993 , a water sample was collected from the domestic <br /> well located on the site. The sample was collected in 40 ml EPA <br /> vials, and stored on ice pending transmission to Mccampbell <br /> Analytical in Pacheco. The sample was analyzed for TPH as gasoline, <br /> BTE&X and EDB in accordance with EPA methods 8015m, 602 and AB <br /> 1803 , respectively. <br /> 4.0 FINDINGS <br /> 4. 1 stratigraphy <br /> The boring penetrated predominately brown to gray silty clay to <br /> silty sand. Strong hydrocarbon odors were observed in soil samples <br /> from borings B1, B2 and B3 . Volatile organic vapors were detected <br /> at concentrations of up to 1446 parts per million (ppm) by the PID. <br /> Moderate hydrocarbon odors were observed in boring B6, and volatile <br /> organic vapors were detected at a level of 304 ppm by the PID. Only <br /> slight hydrocarbon odors were noted in._ boring B4, and no <br /> hydrocarbon odors were observed in boring B5. <br /> 4 .2 Laboratory Results of Soil Samples <br /> Hydrocarbon contamination was detected in nine of the ten soil <br /> samples analyzed. No contamination was detected at a depth of 30 <br /> feet in boring B4 (B4-30) . TPH as gasoline was detected in boring <br /> B1 at depths of 15, 20 and 25 feet at levels of 9, 600 ppm, 12, 000 <br /> ppm and 44 ppm, respectively. In boring B2, TPH was detected at 200 <br /> ppm, 1, 300 ppm and 200 ppm, at depths of 15, 20 and 25 feet, <br /> respectively. Gasoline was detected in boring B3 at a depth of 25 <br /> feet (180 ppm) and in boring B4 at a depth of 20 feet (1. 6 ppm) . No <br /> gasoline was detected in sample B3-30. <br /> Volatile aromatic compounds (BTE&X) were also .detected in nine of <br /> the ten soil samples at levels as great as 1, 000 ppm (xylenes, B1- <br /> 20) . The analytical results are summarized in Tables 1. The <br /> laboratory report and chain of custody are attached in Appendix A. <br /> 4.3 Laboratory Results of Water Samples <br /> No contaminants were detected in the water sample collected from <br /> the domestic well (Appendix A) . Since groundwater depth is <br /> estimated at 80 to 90 feet, and field screening did not indicate <br /> the presence of volatile organic vapors at depths of greater than <br /> 30 feet, it is unlikely that groundwater has been impacted. <br /> Therefore, a groundwater monitoring well was not required by the <br /> PHS/EHD. <br /> 3 <br />