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41 <br /> GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 OS <br /> May 2, 1996 <br /> Page 2 <br /> Groundwater measurements indicate groundwater flow direction is to the north with a hydraulic <br /> gradient of approximately 0 001 feet/foot (see Plate 2) A historical summary of the groundwater <br /> elevations measured during past sampling events Is summarized in Table 1 <br /> Analytical results for the water samples obtained from MW 1 through MW3 revealed detectable <br /> concentrations of TPH as gasoline ranging from 170 micrograms per liter (µg/Q) to 320 Ag1f, <br /> BTEX constituents were also detected in monitoring wells MW1 through MW3 No detectable <br /> concentrations of TPH as gasoline or BTEX were detected In water samples collected from <br /> MW4 No detectable concentrations of MTBE were detected in water samples collected from <br /> MW3 Analytical results of groundwater samples obtained from the eight monitoring wells are <br /> summarized in Table 2 Chain-of-custody documentation and laboratory reports are included in <br /> Appendix B <br /> Review of analytical results of the composite stockpile soil sample (STK1), TPH as diesel was <br /> detected at 420 milligrams per kilogram, BTEX constituents were not detected Analytical results <br /> of the stockpile soil sample are summarized In Table 3, laboratory reports and chain-of-custody <br /> documentation are also included in Appendix B <br /> Based on the analytical results of this quarter, monitoring wells MW1 through MW3 continue to <br /> reveal moderate concentrations of dissolved phase petroleum hydrocarbons However, no <br /> evidence of petroleum hydrocarbons have been detected In MW4 located down-gradient <br /> Based on analytical results for the composite soil sample, we have provided three alternatives for <br /> disposal/remediation of the stockpile Alternative #1, Incorporate the stockpiled soil Into the <br /> asphalt batch plant Alternative #2, construct a bioremediation cell and Introduce fertilizer/water <br /> Into the soil to remediate the diesel contaminated soils to acceptable concentrations Alternative <br /> #3, load and haul the stockpile to a Class II/III landfill We can provide costs for each of these <br /> options upon your request <br /> 0 <br /> `0% <br /> WALLACE•KUHL <br /> Recycled pVp &ASSOCIATES INC <br />