ARCHIVED REPORTS XR0001926 - Laserfiche WebLink

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3.0 FINDINGS 3 1 FIELD OBSERVATIONS On September 14, 1994, ESE observed that the well box for well SI-1 was broken and in need of repair The remaining ground water monitoring wells, SI-2, SI-3, and UST-1 appeared in good condition ESE noted that the interior of well UST-1 was clean and free of surface leakage 3 2 GROUND WATER MONITORING The ground water levels in wells SI-1, SI-2, SI-3, UST-1 and the small and large water supply wells on September 14, 1994 were approximately 78 feet below the top of casing No free product was observed in any of the wells Table 1 tabulates water level measurements and elevation calculations for these wells, and Figure 2 shows these data in map view The ground water flow direction beneath the site appears to be toward the east-northeast in the area of the fueling island and to the north in the northern portion of the site The northerly component of ground water flow at the site may be due to the "large well" which was noted to be pumping at the time of measurement The calculated ground water gradient ranged from approximately 26 to 33 feet per mile Both the small and large wells are active pumping wells and likely influence the local direction of 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 (Appendix A) Ground water from UST-1 contained 330 micrograms per liter (µg/1), or parts per billion (ppb) of TPH as gasoline Benzene and toluene were reported as nondetectable, however, toluene was found at a concentration of 1 4, and total xylenes at a concentration of 3 6 µg11 TPH as diesel was reported at a concentration of 21 milligrams per Liter (mg/L) or parts per million Analysis of the trip blank accompanying the UST-1 sample reported nondetectable concentrations of BTEX analytes F 16M400\3gm94 rpt 3 Envuonmenzaf Science do Engineering Inc