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1 <br /> EPA methods 5030,8015m and 602,respectively The laboratory report and cha,n-of-custody <br /> are presented in Appendix B <br /> 33 Stockpiled Soil Sample Collection and Analysis <br /> 1 <br /> Three soil samples were collected from the stockpiled soil near the northern property <br /> boundary on December 12, 1994. Soil samples were collected using a metric soil sampler <br /> ' encasing two 2-inch by 3-inch brass sleeves The lead tube was covered with aluminum foil, <br /> capped, placed in a chilled container, and transported to AAL Each sample was analyzed <br /> for total petroleum hydrocarbons (TPH as gasoline, diesel and motor oil) and volatile <br /> ' aromatics (BTE&X) The laboratory report and the chain-of-custody are presented in <br /> Appendix B <br /> 4.0 FINDINGS <br /> ' 4.1 Relative Groundwater Elevation and Gradient <br /> The relative elevation of groundwater in each well was calculated by subtracting the depth <br /> to groundwater from the surveyed relative casing elevation (Table 1) During the December <br /> 1994 monitoring event the average depth to groundwater 72 65 feet below surface grade <br /> ' (bsg) The gradient was calculated to be 0 0033 ft/ft directed N 44° E (Figure 3) This is <br /> consistent with data from the November 1993, May 1994 and September 1994 monitoring <br /> events <br /> 4.2 Laboratory Evidence of Groundwater Contamination <br /> ' TPH as diesel was detected in water samples from MW-1 and MW-3 at concentrations of <br /> 420 ppb and 480 ppb, respectively TPH as gasoline was detected in MW-2 at 67 ppb <br /> Benzene was detected in samples from MW-2 and MW-3 at concentrations of 13 ppb and <br /> ' 0 58 ppb, respectively No toluene, ethylbenzene or ,xylene was detected in any of the wells <br /> The analytical results of the samples are included in Table 2 The laboratory report and <br /> ' chain-of-custody are included in Appendix B <br /> 4.3 Laboratory Evidence of Stockpile Soil Contamination <br /> ' TPH as diesel was detected in all three soil samples from the north stockpile at <br /> concentrations up to 12 ppm TPH as motor oil was detected in each sample at <br /> concentrations up to 74 ppm No TPH as gasoline or BTE&X were detected in the <br /> ' samples The laboratory report and chain-of-custody are included in Appendix B <br /> 1 <br /> peobpnl Auld Serves I.- <br /> Nak On OR442 94M2 S <br /> 1 <br /> -`"iii t "i" t" 1�r r �i�� 1 a f•tt t ti "I„ " U - _ _ � " - - - - - _- <br />