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monitonng However, groundwater did not show a consistent nse over the site. Groundwater flow direction was determined to be slightly east of north (Figure 3) The groundwater gradient was determined to be approximately 0 003 ft/ft. This gradient is more shallow than the gradient calculated in May 1992. The product thickness in MW-1 was ' accounted for in determining the groundwater elevation for the December 1994 monitoring However, product thickness was not accounted for in previous groundwater elevation determinations, performed by other consultants TABLE 2 i RELATIVE GROUNDWATER ELEVATIONS* Nomellini Construction Co. 1045 West Charter Way, Stockton, CA Corrected wat Well Casing Depth aProduct Thickness Groundwater Elevation Groundwater Elevation No {MSL} 2-22-93 12-29-94 2-22-93 12-29-94 2-22-93 12-29-94 MW-1 707 3297 3240 024 016 -2571 -2520 MW-2 702 3160 32 30 024 0 -2439 -2528 MW-3 703 32 5032E92 0 0 -2547 -2513 MW-4 719 3310 32 0 0 -2591 -2573 MW-5 757 3358 3281 0 0 -2601 -2524 MW-6 695 3195 3174 002 0 -2500 -2479 MW-7 737 ---- 3260 ---- 0 ---- -2523 MW-8 700 ---- 3298 ---- 0 ---- -2598 ' MW-9 596 ---- 3084 ---- 0 ---- -2488 * Measurements m feet 4.5 Analytical Results of Groundwater Samples Organic vapors were detected with the PID in the groundwater grab sample collected from boring B-15 Strong hydrocarbon odors were also noted in the grab sample The location for MW-8 was subsequently moved further north to delineate the contaminant plume TPH assam asoline was detected in les from MW-1 through MW-4, MW-6 and MW-7 at $ P concentrations from 430 µg/L {ppb, MW-7} to 53,000 ppb {MW-1) TPH as diesel was detected in samples from MW-1 through MW-7 at concentrations ranging from 76 ppb 0-1.&nl A.&I Se IAC 8 90"09 10260VID45 1V-11.i ORL42 91 4