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a WE <br /> ME—M Aga_ <br /> feet below grade in the bore hole, indicating that the water is <br /> confined. The static water level appears to be at a depth of 37 feet <br /> _ below grade. The thickness of the water-bearing layer appears to <br /> vary from less than 1 foot to more than 10 feet in the vicinity of the <br /> excavation. <br /> Six of the borings were converted to 4-inch-diameter monitoring wells <br /> (Figure 1-2). Elevations of the well casings for wells MPW-1, MPW-2 <br /> and MPW-3 were surveyed in the field using benchmarks of known <br /> elevation. Subsequent measurement of depth to groundwater in the <br /> three surveyed wells showed a northerly groundwater gradient with <br /> a slope of 1 foot per 1000 feet(0.001). <br /> MPW-1, MPW-2, and MPW-3 were developed Pnd sampled on <br /> November 19, 1990. «'ell recharge rates were estimated during <br /> - development and appear below: <br /> ° MPW-1 20 gallons per hour <br /> ° MPW-2 60 gallons per hour <br /> ° MPW-3 20 gallons per hour <br /> AnAyfical ResuIt-Qf Soil Sampling <br /> Analytical results of all soil samples are shown in Table 3-1. Soil <br /> samples were taken in all of the borings except MP-9, MP-17, MP-19, <br /> _ and MP-22 through MP-25. (These borings were installed to obtain <br /> groundwater samples with a hydropunch.) <br /> Results of soil"analyses from borings MP-1 though M?-8, installed <br /> during November, show.;'dieseV,and gasoline 'contamination .in <br /> varying:degrees.on the Nest side and around the easteiii.perimeter of <br /> the excavation.(Figure 3-3). Although no soil samples were taken <br /> from boring ?JP-9 on the north side of the excavation, diesel-and <br /> -� gasoline odorLwere noted in this boring. The highest concentration <br /> of diesel was found in boring MP-2 at a depth of 40.5 feet: Gasoline <br /> was also:found at the highest concentrations in this area: This <br /> correlates with the October findings of diesel at a depth of 33 feet at <br /> slot 6. <br /> Diesel and gasoline contamination, was also encountered in <br /> substantial concentrations at depths of 41 to 46 feet below grade in <br /> boring MP-7. These samples were not submitted for. ,laboratory <br /> analysis since contamination was evident. It should be noted that <br /> previous sampling of slot 3 encountered very little contaminated soil <br /> at a depth of 33-35 feet below grade. <br /> 3-2 <br />