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CECCIIIM, CECCHIM,AND GIOVANNOM,FUF£ING ISLAND <br /> 4.� Ai lllL.LD ®IBSIiR V'A 11 EONS <br /> On May 16, 1995, ESE observed that the well box for well UST-1 had broken again and was in <br /> need of repair The remaining ground water monitoring wells appeared in good condition ESE <br /> noted that the Anterior of well UST-1 was clean and free of surface leakage <br /> 4.2 SOITIL RNDINGS <br /> The results of soil samples collected for laboratory analysis during exploratory drilling for the <br /> monitoring wells are described on Table 1 Hydrocarbon constituents were non-detect in most <br /> soil samples with the exception of findings of low levels of benzene in UST-4 between the depths <br /> of 25 feet bgs and 45 feet bgs (see Table 1, boring UST 4) Benzene was reported to be 0 038 <br /> mg/Kg at 25 feet bgs and 0 033 mg/Kg at 30 feet bgs The highest concentration of benzene was <br /> 0 110 mg/Kg at a depth of 35 feet bgs The benzene concentration decreased to 0 036 mg/Kg at <br /> 40 feet bgs and 0 007 mg/Kg at 45 feet bgs Non-detect levels were reported for benzene below <br /> 45 feet <br />' 4.3 GROUND WAVIER MONETOI18IINO <br /> On May 16, 1995, ground water levels in wells SI-1, SI-2, SI-3, and UST-1 were approximately <br /> 67 feet below the top of casing and within the screened interval No free product was observed in <br /> any of the wells Table 2 tabulates water level depth measurements and water level elevations <br /> calculations for these wells Figure 3 illustrates ground water elevation data in map view <br /> The ground water flow direction beneath the site at the time of measurement appears to be <br /> generally to the north to northeast over the entire site and locally towards UST-1, near the fueling <br /> island The calculated ground water gradient over the site was approximately 0 004 foot/foot <br /> The gradient appears flatter in the northern portion of the site The difference in gradient is <br /> likely due to pumping influences of the onsite wells <br /> Analytical results for well UST-1 through UST-4 are listed on Table 3 - Analytical Results of <br /> Ground Water Samples The certified analytical reports are presented in (Appendix Q On May <br /> 16, 1995, ground water from UST-1 was reported to contain only TPH-D at a concentration of <br /> F 1692540012QM95 RPT 5 Environmental Science&Engfneenng,Inc <br />