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TABLE 14 SENSITIVITY ANALYSIS, IMPACTED GROUND WATER CSA WELL NO 2 FLAG CITY CHEVRON 6421 Capital Avenue, Lodi, California MTBE Consequence Input Parameter Concentration Change (µg11) Area I Area II Area III ND at screened interval,but ND at screened interval, but ND at screened interval,but Increasing detectable concentrations detectable concentrations detectable concentrations Hydraulic Gradient UCL Gradient up to may be present in ground may be present in ground may be present in ground 0 01 ft/ft water interval from 0-50 feet water interval from 0-50 feet water interval from 0-20 feet at gradients of 0 005 ft/ft and at gradients of 0 005 ft/ft and at gradients of 0 006 ft/ft and greater greater greater ND at all depths (from 15 to ND at all depths(from 15 to ND at all depths(from 15 to MTBE Increasing 160 feet bsg)for average 160 feet bsg) for average 160 feet bsg) for average Concentration 84 - 1,300 Concentration ground water MTBE ground water MTBE ground water MTBE concentrations of up to 1,300 concentrations of up to 1,300 concentrations of up to 1,300 µg11 µg/l µg/1 ND at screened interval,but detectable concentrations ND at screened interval, but Increasing ND for soil ranging from (<0 5 µg/1)may be present in detectable concentrations Aquifer Soil Type UCL (<0 5 µg11)may be present in Coarseness silty sand to gravel ground water interval from 0-75 Feet for sandy gravel ground water interval from 0-75 feet for gravel soil and coarser soil Screened Interval Maximum Decreasing ND for all depths from 15 ND for all depths from 15 ND for all depths from 15 Depth feet bsg to total well depth feet bsg to total well de th feet bsg to total well depth Notes pg/l -Micrograms per Liter UCL -Upper Confidence Limit ND -Not detected(<0 5µg11) Maximum -Maximum concentration in ground water of 610µg/1 in Area I,1,300µg/1 in Areas It and III Advanced GeoEnvironmental,Inc