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Table 9a <br />Reclamation Groundwater Level Table <br />Location (1) 0.5 miles <br />northwest (2) 0.3 miles <br />west (3) 0.1 mile <br />north (4)1 mile <br />north (5) 0.5 <br />miles east (6) 0.9 miles <br />south <br />Grid Location 33,19,1 _ 46,19,1 25,27,1 19,28,1 49,55,1 85,30,1 <br />Phase <br />Ground <br />Surface <br />Elevation 4950 4954 4940 4939 4944 4957 <br />Existing WSE 4926.5 4927.7 4928.4 4928.5 4936.7 4944.4 <br />Baseline 4935.61 4937.8 4934.22 4930.6 4936.7 4946.8 <br />Reclamation 4935.5 4936.7 4933.9 4930.6 4936.7 4946.8 <br />Notes: <br />- Locations are all relative to the middle of the Stte. <br />-Ground Surface Elevation is approximate and used for reference. <br />-Approximate locaton of water level, Water Surface Elevation (WSE). <br />- Existing WSE is the water level after calibration. <br />-Groundwater levels compared to Baseline. <br />5.0 SENSITIVITYANALYSIS <br />5.1 Hvd~aulic Conductivity <br />A sensitivity analysis was performed on the hydraulic conductivity of the geological unit underlying the site (Piney Creek <br />& Post Piney Creek Alluvium). The hydraulic conductivities determined in the calibration process are on the low side of <br />the range of values reported {Hershey and Schneider, 1989), but the groundwater levels modeled with these hydrologic <br />conductivities provided the most accurate modeled groundwater levels. <br />The hydraulic conductivity values were varied by 40% below and 90% above the assigned values. See Table 10 below <br />reporting the results of the sensitivity analysis. A reduction in the hydraulic conductivity by 40% caused the calibrated <br />water levels to increase slightly and an increase in hydraulic conductivity by 90% caused the calibrated levels to <br />decrease negligibly. <br />Table 10 <br />Sensitivity Analysis of <br />Hydraulic Conductivity <br /> <br /> <br /> <br />ercent Piney Creek & <br />Post Piney Creek <br />Hydraulic <br />Conductivi <br /> <br /> <br />W1 <br /> <br /> <br />W2 <br /> <br /> <br />W3 <br /> <br /> <br />W4 <br /> <br /> <br />WS <br /> <br /> <br />W6 <br />60% 150 4929.0 4933.7 4933.8 4935.6 4933.8 4938.6 <br />80% 200 4928.7 4933.6 4933.8 4935.6 4933.8 4938.6 <br />110% 275 4928.5 4933.6 4933.6 4935.4 4933.8 4938.6 <br />130% 325 4928.5 4933.5 4933.6 4935.4 4933.8 4938.6 <br />160% 400 4928.4 4933.5 4933.6 4935.4 4933.8 4938.6 <br />190% 475 4928.3 4933.5 4933.6 4935.4 4933.8 4938.6 <br />Notes: <br />Modeled groundwater levels reponed for each monitoring well location. <br />Groundwater Model Report -Hall-Irwin Parker-Dersham Site -10 - April 2006 <br />