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1 <br /> 16 3.2 Pumping Wells <br /> Two operational pumping wells have been identified at the facility At least one well is in <br /> operation at any given time The nearer well is located approximately 150 feet north of the <br /> former UST Since groundwater flows in a south-westerly direction, this well is located in an <br /> upgradient direction This well does not appear to affect the groundwater flow in the area <br /> The further well is located approximately 1,000 feet south-west of the former UST location <br /> This is in a downgradient direction from the former UST However, based on the low <br /> gradient present at the site (0 001 to 0.002 ft/ft), and recent studies that indicate that typical <br /> fuel hydrocarbon plumes do not extent beyond 250 feet (Lawrence Livermore National <br /> Laboratory, 1995), it is unlikely that this well would be impacted by the fuel release from the <br /> former UST <br /> 3.3 Groundwater Quality Data <br /> TPH as diesel was detected in three of the six monitonng wells at the site The groundwater <br /> sample from MW-4 yielded 74 pg/L, MW-5 yielded 190 pg/L and MW-6 yielded 180 pg/L <br /> These concentrations are higher than those measured in November 1995 at MW-5 and MW-6, <br /> but lower than those measured at MW-4 (Table 2) Groundwater from monitoring wells <br /> MW-1, MW-2 and MW-3 did not yield any TPH as diesel The quality control sample <br /> (equipment nnsate) collected during the sampling did not yield any TPH as diesel The <br /> laboratory quality control data was also found to be acceptable <br /> Table 2 provides a summary of the groundwater analytical results. The Certified laboratory <br /> results are provided in Appendix C <br /> MZ/05-07-96/VDBF/9E-0007 If 3-2 <br />