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t""/VAS <br /> Working To Restore Nature <br /> tr:/ No petroleum hydrocarbon analytes were detected in any soil sample (Table 2). However, <br /> elevated levels of TPHd and aromatics were present in the groundwater sample collected from <br /> k<� beneath the diesel tank (Table 3). <br /> On October 23 and 24, 1989, three soil borings (MW1, MW2 and MW3) were drilled under the <br /> supervision of RESNA, and completed as monitoring wells (Figure 2). The depths of the <br /> borings ranged from 21 to 24 feet below grade. Soil samples were collected from each boring <br /> between 8.5 and 9.0 feet below grade, the capillary fringe. The samples were analyzed for <br /> BTEX and TPHd. Petroleum hydrocarbon analytes were not resent at or above method <br /> � Y Y P <br /> detection limits in the soil samples (Table 2). Groundwater samples were collected and analyzed <br /> for BTEX, and TPHd. Low levels of toluene were present in wells MWl and MW2 at 0.88 and <br /> 0.32 j,glf,, respectively (Table 3). No other petroleum hydrocarbon analytes were present at or <br /> above method detection limits in the groundwater samples collected from MWl, MW2, or <br /> MW3. <br /> On May 22, 1990, RESNA supervised the installation of an additional monitoring well, MW4, <br /> at the downgradient edge of the former tank location (Figure 2). A soil sample collected from <br /> the capillary fringe (5.5 feet below grade) was analyzed for BTEX and TPHd. Low levels of <br /> petroleum hydrocarbon analytes were present in the soil sample (Table 2). A groundwater <br /> sample was collected from the well and analyzed for BTEX and TPHd. Detectable levels of <br /> petroleum hydrocarbons as diesel and BTEX were present in the groundwater 3 sample Table . <br /> p ( } <br /> Following the installation of well MW4 a program of quarterly groundwater monitoring and <br /> sampling was instituted. Historical groundwater elevation data and analytical results are <br /> f. <br /> summarized in Tables 1 and 3, respectively. <br /> To investigate the possibility of residual soil contamination in the former diesel tank pit, RESNA <br /> personnel supervised the drilling and sampling of two soil borings (SB 1 and SB2) on July 27, <br /> OW01951REPORT51CLOM94.FNL 3 <br /> tr?JI <br /> i <br />