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well were then measured and these data included on Table 1 - Ground Water Monitoring Well - Measurements 3 2 GROUND WATER MONITORING The ground water levels in wells SI-1, SI-2, SI-3, UST-1 and the small and large wells on April 28, 1994 were approximately 75 feet below the top of casing The small and large wells were surveyed to a relative elevation reference point and were surveyed to a relative elevation reference point and included in the ground water level measurements No free product was observed ESE noted that the interior of well UST-1 was clean and free of surface leakage Table 1 tabulates water level measurements and elevation calculations for these wells, and Figure 2- relative ground water elevation, April 28, 1994 shows these data in map view Ground water flow direction appears to be toward the east-northeast The ground water gradient is estimated at approximately 8 13 feet per mile in the north portion of the property, and approximately 44 00 feet per mile in the south portion Both the small and large wells are active pumping wells and likely influence the local ground water flow under the site Analytical results for well UST-1 are shown on Table 2 - Analytical Results of Ground Water Samples and on the enclosed laboratory certificates of analysis Ground water from UST-1 I contained 130 micrograms per liter (gg/I), or parts per billion (ppb) of TPH as gasoline BTEX constituents were also reported as nondetectable for begene, toluene, ethylbenzene and xylene TPH as diesel was reported at a concentration of 4±*fligrams per Liter (mg/L) or parts per million Analysis of the trip blank accompanying the UST-1 sample reported nondetectable concentrations of BTEX analytes Laboratory analytical documents are included as Appendix A 3 2 1 Discussion The ground water elevation calculated for well UST-1 has increased 3 0 feet relative to that reported for January 1994 This increase is likely due to recharge associated with seasonal precipitation Ground water flow direction at the site is variable, and likely due to onsite and nearby pumping wells F 1692540012gm94 rpt 4 Environmental Science&Engmeermg Inc. i