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TABLE 2 CUMULATIVE SUMMARY OF CONCENTRATIONS (µg/L=ppb) OF PETROLEUM HYDROCARBONS IN THE GROUNDWATER,FORMER IEXXON RS 7-3942, 4444 PERSHING AVENUE, STOCKTON, CA I Total Well Ethyl- Hydro- No. Date Benzene Toluene benzene Xylenes carbons GWl 09/23/86 40,000 43,000 NA 9,900 130,000 MWl 01/87 <1 <1 NA <1 <50 I MWl 07/16/87 <0.5 1.5 <0.5 <0.50 <100 MWl 04/11/88 <0.5 <0.5 <0.5 <0.5 <100 MWl 09/13/88 1.9 2.5 <0.5 <0.5 70 MWl 11/16/88 <0.5 9.5 <0.5 <0.5 130 MWl 02/09/89 1.7 0.2 0.2 0.6 <250 MW 1 05/31/89 <0.5 <0.5 <0.5 0.8 <250 MWl 08/17/89 <0.5 <0.5 <0.5 <0.5 <250 MWl 12/19/89 <0.5 1.9 <0.5 <0.5 <250 MWl 03/21/90 <0.5 <0.5 0.8 2.9 80 MWl 05/17/90 <0.5 4.5 <0.5 <0.5 120 f MW1 09/25/90 <0.5 7.0 1.0 4.7 170 MW 1 12/19/90 Not sampled- well was dry MWl 01/30/91 Not sampled- well was dry MW 1 05/02/91 Not sampled- well was dry MW2 01/87 26 190 NA 1,100 11,000 MW2 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 1,600 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 MW2 12/19/89 Not sampled- well was dry MW2 03/21/90 Not sampled- well was dry MW2 05/17/90 Not sampled- well was dry MW2 09/25/90 Not sampled- well was dry MW2 12/19/90 Not sampled- well was dry MW2 01/30/91 Not sampled- well was dry MW2 05/02/91 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- LPPH MW3 11/16/88 <250 3,200 1,900 8,600 61,000 MW3 02/09/89 Not sampled - LPPH MW3 05/31/89 Not sampled - LPPH <indicates that the concentration was below the noted detection limit. NA =not analyzed. LPPH= liquid-phase petroleum hydrocarbons. Data from 1/87 from HLA report 1987. oaem�vi�sia i