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3.2 GROUND WATER MONITORING The ground water levels in wells SI-1, SI-2, SI-3 and UST-1 on January 27, 1994 were approximately 82 feet below the top of casing. No free product was observed ESE noted that the interior of well UST-1 was clean and free of surface leakage Table 1 - Ground Water Monitoring Well Measurements tabulates water level measurements and elevation calculations for these wells, and Figure 2 - Relative Ground Water Elevation January 27, j 1994 shows these data in map view Ground mater flow direction in the northern portion of the property appears to be toward the southeast Ground water level in well UST-1 is higher than in wells on the northern portion of the property Because of the close proximity of well UST-1 to the water supply well, it is likely that ground water flows westward toward the supply well on this portion of the site, however there is no supporting data 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 contained nondetectable concentrations of TPH as gasoline BTEX constituents were also reported as nondetectable for benzene, toluene of 0 7 micrograms per liter (µg/L) or arts per billion b eth lbenzene of 3 b; and xylenes of 6 b TPH as diesel was P P (ppb), Y PP XY PP > reported at a concentration of 24 milligrams per Liter 4 Og/L & parts e�_r_nulhon Analysis TA,ODb. of the trip blank accompanying the UST-1 sample reported nondetectable concentrations ?P,1 of all 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 7 feet relative to that reported for November 1993 This increase is likely due to recharge associated with seasonal precipitation Ground water flow at the site is likely toward the actively pumping water supply wells, but the flow direction and gradient cannot be verified with the existing network of monitoring wells at the site until elevations are suryeyed on the "Small" and ,Large Wells" ,1&)�A F\6925400\1grnM rpt 5 Environmental Science&Engineering, Inc