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T2' `SMt Ii P'x TABLE 2 CUMULATIVE SUMMARY OF CONCENTRATIONS(jig/L=ppb)OF 1PETROLER M HYDROCARBONS IN THE GROUNDWATER,FORMER EXXON RS 7-3942,4444 PERSHING AVENUE,STOCKTON,CA Total Well Ethyl- Hydro- .NDL- Late BenNne Toluene bozene Xylfnes carbons GWI 09/23/86 40,000 43,000 NA 9,900 130,000 MWI 01/87 <1 <1 NA <1 <50 MWI 07/16/87 <0.5 1.5 <0.5 <0.50 <100 - MWI 04/11/88 <0.5 <0.5 <0.5 <0.5 <100 MWI 09/13/88 1.9 2.5 <0.5 <0.5 70 i MWI 11/16/88 <3.5 9.5 <0.5 <0.5 130 MWI 02109/89 1.7 0.2 0.2 0.6 <250 MWI 05/31/89 <0.5 <0.5 <0.5 0.8 <250 ! MW 1 08/17/89 <0.5 <0.5 <0.5 <0.5 <250 MWI 12/19189 <0.5 1.9 <0.5 <0.5 Q50 -- MWI 03121/90 <0.5 <0.5 0.8 2.9 80 MWI 05/17/90 <0.5 4.5 <0.5 <0.5 120 t MW2 01/87 . 26 190 NA 11100 11,000 1vILV2 07/16/87 68 26 630 1,320 4,800 -� MW2 04/11/88 94 <20 240 880 11,000. MW2 09/13/88 600 62 520 1,900 7,400 MW2 11/16/88 840 140 650 1,640 10,000 - MW2 02/09/89 480 55 660 1,700 7,200 MW2 05/31/89 680 62 800 3,100 17,000 MW2 08/17/89 2,100 430 350 1,700 15,000 j A MW2 12/19/89 Not sampled-well was dry MW2 03/21/90 Not sampled-welI was dry s MW2 05/17/90 Not sampled-well was dry MW3 01/87 17 640 NA 400 32,000 MW3 07/16/87 830 600 190 436 1,700 MW3 04/11/88 450 970 210 860 4,600 MW3 09/13/88 Not sampled-free product detected MW3 11/16/88 <250 3,200 11900 8,600 61,000 - MW3 02109/89 Not sampled-free product detected MW3 05/31/89 Not sampled-free product detected MW3 08/17/89 Not sampled-free product detected MW3 12/19/89 Not sampled-free product detected MW3 03/21/90 Not sampled-free product detected MW3 05/17/90 Not sampled-well was dry i . ` N W4 07/16/87 1,100 <50 - 850 1,750 - 4,900 i - MW4 04/11/88 510 <25 490 1,100 8,500 t <indicates that the concentration was below the noted detection limit. NA=not analyzed. m30f7cxxon3942h2 t