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Table 1 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Service Station k 94275 2905 West Benjamin Hol[Drive Stockton,Galifomia Well Groundwater Depth Ethyl- Total Well Date Elevation Elevation to Water TPHp Benzene Toluene benzene Xylenes MtBE ID Sampled Notes (ft,MSL) A MSL) (ft TOC) NO) NO) (u9/1) (119/1) (u94) NO) MW-4 12!0501 -8.53 11.34 <50 <0.5 <0.5 <0.5 <0.5 14 (cont.) 03/11102 -6.26 9.07 170 <0.5 <0.5 <0.5 <0.5 52 06/07102 -7.11 9.92 160. <0.5 <0.5 <0.5 -0.5 11. 09124!02 -9.22 12.03 50. <0.5 <0.5 <0.5 <0.5 4. 12!17!02 -8.64 11.45 <50. <0.5 <0.5 <0.5 <0.5 4, 03/18103 -7.39 10.20 300 18 <0.5 <0.5 <0.5 28 06117!03 -7.48 10.29 <50 <0.5 <0.5 <0.5 <0.5 <2 09124103 -9.21 12.02 <50 <0.5 <0.5 <0.5 -0.5 2 12/18/03 -8.96 11.77 -50 <0.5 <0.5 <0.5 <0.5 8 03/23104 -6.74 9.55 53 -0.5 <0.5 <0.5 <0.5 7 06!22104 -8.57 11.38 <50 <0.5 <0.5 -0.5 <0.5 6 09!21104 -9.69 12.50 -50 -0,5 -0.5 <0.5 <0.5 3 12/28/04 -8.39 11.20 <50 <0.5 <0.5 <0.5 <0.5 5 03107/05 -5.83 8.64 92 -0.5 <0.5 -0.5 <0.5 a MW-5 03/22/89 3.79 -13.39 17.18 4,900 35 23 110 760 -- 06l12189 -14.01 17.80 900 24 2.0 2.0 53 -- 09/07/89 -15.32 19.11 410 16 4.0 12 50 -- 09/07189 (D) -- - 380 15 4.0 11 49 - 12/18/89 -14.84 18.63 2,900 24 22 100 590 -- 03/20190 -14.40 18.19 3,400 37 29 120 630 - 07103/90 -15.64 19.43 5,500 65 89 200 1.200 - 10119190 -16.25 20.04 5,900 55 82 190 1,100 -- 01117191 -16.19 19.98 4,900 26 51 140 830 - 03119191 - -- 6,800 18 24 21 790 - 07118191 -15.93 19.72 7,600 60 65 190 800 -- 10131191 -16.41 20.20 2,600 44 24 64 310 -- 01116/92 -15.81 19.60 5,400 120 72 250 1,000 :- 01116192 (D) -- - 4,70D 110 63 230 960 03111192 -14.85 18.64 - -- -- - - -- 03117192 -14.74 18.53 1,100 37 13 52 170 -- 06129192 -16.39 20.18 850 18 9.0 25 200 -- 12110192 -16.99 20.78 1,200 49 16 64 200 -- 02l04193 -15.23 19.02 1,200 31 12 58 250 05118193 -12.95 16.74 2,000 58 10 170 190 08105/93 -13.76 17.55 750 32 4.6 50 100 - 11l09l93 -14.49 18.28 1,400 29 3.8 46 190 - 0111M4 -13.96 17.77 1,200 31 4.8 75 180 -- 06l27194 -13.40 17.19 150 6.2 ND 0.6 19 •- 01/18/94 -14.68 19.47 1,400 29 3.0 40 160 -- 01118194 -14.37 18.16 1,000 19 3.7 28 130 -- 03108t95 -12.33 16.12 750 22 0.7 30 60 -- 06101195 -10.68 14.47 3,600 110 13 240 390 -- 09111195 -12.40 16.19 890 40 3.6 76 140 -- 12105195 -13.01 16.80 410 6.7 <0.5 11 43 -- 03/16196 -9.51 13.30 740 10 -0.5 38 66 06/18/96 -9.17 12.96 7,200 86 6.7 770 540 15 09/24/96 -11.00 14.79 12,000 74 5.0 760 1,100 59 12/04/96 -10.83 14.62 1,100 8.3 1.0 93 63 <5.0 02/25/97 -6.63 10.42 24,040 570 1,400 11500 51300 -50 05/06/97 -7.46 11.25 38,000 580 790 3,000 12,000 <120 09129/97 -10.30 14.09 15,000 300 <12 1,500 1,000 <120 11/25/97 -10.35 14.14 8,300 290 <50 770 450 <250 03/26/98 -4,06 7.85 <50 <0.5 <0.5 -0.5 <0.5 <2.5 06!24198 -5.77 9.56 <50 <0.5 <0.5 0.64 <0.5 100 09/10/98 -7.79 11.58 100 3.6 1.5 10 5.8 4.7 12!17198 -7.61 11.40 52 1,2 <0.5 3.9 2.3 680 03/10/99 -5.90 9.69 <50 <0.5 <0.5 0.61 -0.5 19 06122/99 -6.36 10.15 <50 <0.5 -0.5 <0.5 <0.5 <2.Q 09113199 -9.02 12.81 1,900 20 3.4 130 85 32 12/16199 -8.90 12.69 2040 8.71 4.85 137 99.6 10.8 03101/00 -4.16 7.95 90.6 <0.5 <0.5 -0.5 1.47 4.15 061131D0 -6.40 10.19 <50.0 <0.500 `<0.500 -0.500 -0.500 <5.00 09/13100 -8.45 12.24 -50.0 -0.500 -0.500 <0.500 -0.500 -5.00 12)14100 -8.01 11.80 -50.0 -0.500 -0.500 <0.500 -1.50 6.00 liChevron042751PehodiC Monitmin940 M R594275 0MRAs _ 5 of 11