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TABLE 15 SENSITIVITY ANALYSIS, IMPACTED GROUND WATER SENTINEL WELL MW-10 FLAG CITY CHEVRON 6421 Capital Avenue, Lodi, California Input MTBE Consequence Parameter Concentration Change (µg/1) Area I Area II Area III ic H draulIncreasing MTBE detected in ground MTBE detected in ground water MTBE detected in ground water Hydraulic Gradient UCL Gradient up to water interval from 0-50 feet at interval from 0-75 feet at interval from 0-50 feet at 0 01 ft/ft gradients of 0 002-0 01 ft/ft gradients of 0 002-0 01 ft/ft gradients of 0 003-0 01 ft/ft MTBE detected in ground MTBE detected in ground water MTBE detected in ground water water interval from 0-50 feet at interval from 0-50 feet at interval from 0-50 feet when MTBE Increasing dissolved source UCL dissolved source UCL dissolved source concentration Concentration 84 - 1,300 concentration of 101 µg/l,but concentration of 171 /l but approaches 200 ll but was Concentration pg/l, PP µg , was not detected in deeper was not detected in deeper not detected in deeper intervals intervals even at maximum intervals even at maximum even at maximum concentration concentration of 610 µgll concentration of 1,300 µg11 of 1,300 ugIl Aquifer Soil UCL Increasing ND for soil ranging from silty MTBE detected in ground water MTBE detected in ground water Type Coarseness sand to gravel interval from 0-75 feet for sandy interval from 0-50 feet for sandy gravel and coarser soil gravel and coarser soil Screened Decreasing MTBE detected in ground MTBE detected in ground water Maximum water interval from 0-50 feet at interval from 0-50 feet at ND for all depths from 15 feet Interval Depth maximum concentration maximum concentration bsg to total well depth Notes Iig/l -Micrograms per Liter UCL -Upper Confidence Limit ND -Not detected(<0 51Ag/1) Maximum -Maximum concentration in ground water of 610µg/1 in Area 1, 1,300µg/1 in Areas II and III Advanced GeoEnviranmental,Inc