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m <br /> ri <br /> 3, initiation of a coorc3inata�tiesoto addressklthe <br /> pc:entially responsible p <br /> commingled hyd.:ocarbon plume offsite and dmmendationf, <br /> of the property. In response to this recommendation, <br /> S.A. has recently been <br /> Exxon Cat*�pany, U. requested by <br /> the SJCPtis to initiate a site investigation. <br /> 5.0 SUMMARY OF AQUIFER TFSTITIG RESULTS <br /> te in1990 <br /> ary <br /> were performed at tsiusltests wereuiniti.ally <br /> Aquifer tests <br /> (Alton Geoscience, P.prI WellsmW-3and M41-4 to assess the <br /> performed in 1•ionitoring <br /> s far use in the design of a <br /> remediation system. Data fromroundtwateruQumping systemed in <br /> aquifer characteristicwo slg tests was <br /> computer aided modeling of a g 199x3} . <br /> test <br /> using FLOWPATH (Franz and Guiguer, <br /> results indicate that the hydraulic <br /> The slug K of the aquifer is approximately <br /> conductivity ( ? gradient is a,pproxi-mately <br /> 3.5 feet/day, while the hydraulic g quarterly <br /> 0.006 foot per foot (ft/ft) based on recent q <br /> monitoring results. The calculated vLlue of cay o <br /> consistent <br /> with the typically reported values for silty- <br /> 1 soil <br /> encountered at the site. <br /> The following table presents the predicted results using the <br /> above parameters in the F OWPAT computer model for various <br /> pumping rates for steady- <br /> stateflJw- <br /> RESULTS OF CAPTURE ZONE MODELING <br /> Hydraulic Conductivity: 3.5 feet/day <br /> Hydraulic Gradient: 0.006 ft/ft <br /> ONE-YEAR ONE-YEAR <br /> ONE-YEAR <br /> UPGRAI]iENT CROSSGRADIENT <br /> PUMP DRAW- D050GRADIENT CAPTURE ZONE CAPTURE ZONE <br /> RATE DOWN RAPTURE ZONE RADIUS (ft) RADIUS (ft) <br /> (gpm) (ft) RADIUS (ft) <br /> 55 <br /> 1 2.- 32 97 81 <br /> 2 4.2 72 165 135 <br /> 5 5.6 130 <br /> 10 29.9 not feasible not feasible not feasible <br /> Based on this da',a, a pumping rate of 1 gpm or less is <br /> This pumping--rate .wo.uld produce a drawdown of <br /> recommended: <br /> ture .zone...radius._o ....... _._ ----... <br /> approximately 2.5 feat, a downgeaar;eandcaperossgradienu <br /> approximately 30 feet after 11 tely 55 feet after 1 year. <br /> capture zone radius of app veli MW-5 as a single <br /> Thus, t'ne use of 9--inch Monitoring <br />