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7 TABLE 3 CUMULA'CivM SUMMARY OF CONCENTRATIONS (gg/L=ppb)OF PETROLEUM HYDROCARBONS IN THE GROUNDWATER,FORMER EXXON RS 7-3942,STOCK'ION,CALIFQRNIA Well Ethyl- No. Date -Benzene Tol ien bcnzcne_ Xxlenes_ TPH GW I 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 04111/8F <0.5 <0.5 <;'.5 <0.5 MV,%1 09/13/88 1.9 2.5 <0.5 <0.5 70 MW 1 11/16/88 <0.5 9.5 <0.5 <0.5 1_14 MWI 92/09/89 1.7 0.2 0.2 0.6 <250 MWI 05/31/89 <0.5 <0.5 <0.5 0.8 <250 ;VIW 1 08/17/89 <0.5 <0..5 <0.5 <0.5 <250 MW 1 12/19/89 <0.5 1.9 <0.5 <0.5 <250 .Awl 03/21/90 <0.5 <0.5 0.8 2.9 80 MW 1 05/17/90 <0.5 4.5 <0.5 <0.5 120 MW 1 09/25/90 <0.5 7.0 1.0 4.7 170 MWI 12/19/90 Not sampled-well was dry MWI 01/30/91 Not sampled- well was dry MWI 05/02/9I Not sampled-well was dry M;VI 07/16/91 Not sampled-well was dr7 MWI 10/15!91 Insufficient water to purge or sample MW2 01/37 26 190 NA 1,1,0 11,000 MW2 0"/16/87 63 26 630 1,320' 4,800 MW2 04/11/88 9Y <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 12/1911)0 Not sampled-well was dry MW2 01/30/91 Not sampled-well was dry MW2 05/02/91 Not sampled-well was dry MW2 07/16/91 Not sampled-well was dry MW2 W/15//)1 Not sampled-well was dry MW3 01187 17 640 NA 400 32,000 MW3 07/16/87 830 600 190 436 1,700 MW3 011/1450 970 210 860 4,600 MW3 091!11x:8 Not sampled-LPH �indicates that the concentration was below the nested detcction limit. NA=not analyzed. LPl-i= liquid-phase hydrocarbons. Data from 1/87 from DILA report 1987. n�wnn�ha�r}x7rexx:rvura,z � i-a I