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encountered in the monitoring wells during the December sampling or in any of the boreholes <br /> sampled in February <br /> 3.3 Soil Quality Data <br /> In June 1990, two diesel UST's (300 gallon and 550 gallon) located beneath the on-site <br /> building (Figure 2) were closed in place by triple rinsing, pumping fluid and filling with <br /> cement slung A sora boring was hand bored beneath the building near the abandoned tanks <br /> Analysis of soil samples collected from this boring revealed diesel concentrations up to <br /> 13,000 ppm <br /> Soil samples collected from the three groundwater monitoring wells (MW-1, MW-2 and MW- <br /> 3) revealed no detectable diesel concentrations upon analysis. Volatile hydrocarbons were <br /> encountered in a soil sample collected at 40 feet below grade in downgradient well MW-1 <br /> (toluene at 0.005 ppm and xylenes at 0 005 ppm) and in a soil sample collected at 20 feet <br /> below grade in upgradiient well MW-3 (ethylbenzene at 0.006 ppm and xylenes at 0.013 <br /> ppm) Gasoline was additionally reported for the sample collected from well MW-3, <br /> however, the petroleum hydrocarbons encountered did not match the gasoline standard. <br /> Several QA/QC anomalies were encountered during analysis of tins sample which are <br /> addressed in a letter enclosed in Appendix D <br /> Analysis of soil samples collected from boreholes SB-1 through SB-6 revealed no detectable <br /> e <br /> diesel or volatile hydrocarbon concentrations Analytical results are listed in Table 2 and <br /> depicted in Figure 4. <br /> 3.4 Groundwater Quality Data <br /> No groundwater was encountered in the soil borings, drilled to an approximate depth of 17 <br /> feet, adjacent to the 300 and 550 gallon diesel tanks. These tanks were closed in place <br /> December 1990 <br /> Groundwater samples collected from down and side-gradient monitoring wells MW-1 and <br /> MW-2 following well development in December 1991, revealed diesel concentrations at 130 <br /> ppb and 52 ppb respectively No diesel concentrations were encountered ui the sample <br /> collected from well MW-3. No volatile petroleum hydrocarbons were encountered in any <br /> well during the December 1991 sampling. The monitoring wells have been subsequently <br /> MZ/03-17-93/irNG/93-0034 ff 6 <br />