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Table 1 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Servioe Station 99.4275 . 2905Benjamin Drives Stocktn,Califomie Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHB Benzene Toluene benzene (total) MtBE ID Sampled (ft,MSL) (ft,MSL) (ft.TOC) (119/1) NO) (ug/1) (u9/1) NO) (ug/1) MW-2 12/14/00 -7.92 11.33 6'7.00.753 <0.500 <0.500 0.50 14.5 (cont.) 03/02/01 (S) -6.37 9.78 1,400' 25 <5.0 17 <5.0 3801410' 03102/01' (K) -6.37 9.78 1,800 10 <0.50 16 2.6 380 05/10/01 -5.91 9.32 2,100 13 0.63 24 3.4 210 08/21/01 -8.71 12.12 170 <0.50 <0.50 <0.50 0.61 16 12/05/01 -8.29 11.70 75 <0.5 <0.5 <0.5 0.8 4.0 03/11102 -6.17 9.58 2,600 8. <0.5 11. 7. 240 06/07/02 -6.98 10.39 1,700. S. <0.5 3. 4. 130. 09/24102 -9.12 12.53 170. <0.5 <0.5 <0.5 <0.5 7. 12/17102 418 11.59 140. <0.5 <0.5 3. 5. 11, 03/18103 -7.15 10.56 1,700 2 <0.5 6 11 110 06117!03 -7.48 10.89 1,300 2 <0.5 7 t0 74 09!24103 -9.22 12.63 120 0.6 <0.5 2 2 6 12116/03 -8.82 12.23 510 2 <0.5 17 29 11 03123104 -6.64 10.05 2100 6 <0.5 6 10 150 06122/04 -8.57 11.98 1,300 4 <0.5 4 5 150 09/21104 -9.66 13.07 1,800 2 <0.8 20 28 38 MW-3 03/22/89 2.40 -14.11 16.51 NO ND NO ND NO -- 06l12l89 -14.79 17.19 ND NO ND ND NO - 09/07/89 -16.24 18.64 ND NO ND ND ND - 12/18/89 -15.38 17.78 NO NO ND ND ND -- 03l20190 -15.15 17.55 ND NO ND NO ND - 07/03/90 -16.31 18.71 ND NO ND NO ND 10/19/90 -17.23 19.63 NO ND NO NO NO 01/17191 -16.94 19.34 70 ND ND ND NO - 03/19191 -- - NO ND ND NO NO - 07/18191 -17.08 19.48 NO NO ND ND ND - 10131/91 -17.46 19.86 ND NO NO ND ND - 01116/92 -16.65 19.05 ND NO NO NO 0.9 - 03111/92 -15.55 17.95 - - _ - _ 03117/92 -15.50 17.90 NO 0.7 1.1 NO 0.8 » 06!29!92 -17.05 19.45 ND 0.9 ND ND NO - 12110/92 -17.67 20.07 ND NO ND NO 0.5 - 02/04/93 -15.61 18.01 ND NO ND ND ND -- 05/18/93 -13.74 16.14 ND NO 0.8 0.7 3.7 - 08/05/93 -14.60 17.00 120 0.5 2.2 NO 3.0 - 11/09/93 -15.18 17.58 ND ND NO ND ND -- 01/18/94 -14.60 17.20 NO ND NO ND NO - 06/27194 -14.10 16.50 NO ND NO ND NO - 09/29194 -15.30 17.70 ND NO ND ND ND - 12/08194 -14.84 17.24 <50 <0.5 <0.5 <0.5 <0.5 - 03108195 -12,72 15.12 <50 <0.5 <0.5 <0.5 <0.5 - 06101/95 -11.12 13.52 <50 <0.5 <0.5 <0.5 <0.5 - 09111/95 -13.01 15.41 <50 <0.5 <0.5 <0.5 <0.5 - 12105/95 -13.45 15.85 <50 <0.5 <0.5 <0.5 <0.5 - 03118/96 -10.46 12.86 150 0.7 <0.5 <0.5 <0.5 - 06/18/96 -9.53 11.93 <50 <0.5 <0.5 <0.5 <0.5 28 09/24/96 -11.33 13.73 70 <0.5 <0.5 1.1 0.8 <5.0 12/04/96 INACCESSIBLE - - - - 02125/97 -6.68 9.08 70 1.0 0.6 0.5 2.0 20 05/06/97 -7.73 10.13 <50 <0.5 <0.5 <0.5 <0.5 25 09/29/97 -10.48 12.88 <50 <0.5 <0.5 <0.5 <0.5 21 11/25/97 -10.44 12.84 <50 <0.5 <0.5 <0.5 <0.5 9.5 03/26/98 -3.93 6.33 89 1.6 <0.5 <0.5 <0.5 91 06!24198 -5.85 8.25 <50 <0.5 <0.5 <0.5 0.5 36 09/10198 -7.80 10.20 <50 0.75 0.53 <0.5 1.4 11 12/17198 -7.79 10.19 <50 <0.5 <0.5 <0.5 <0.5 55 03110/99 -5.83 8.23 <50 <0.5 <0.5 <0.5 <0.5 37 tkChevroM942751Periodic Monitodng4Q M R%94275-QMR.xis 3of12