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• • • • • • • • • • • • TABLE 1 GROUNDWATER MONITORING DATA Former Unocal Service Station No 2859 1665 Pacific Avenue Stockton, California (page 1 of 3) Well/ Elevation of Static Groundwater Sample Top of Casing Water Elevation Ethyl- Total Number Date (datum is MSL) Level (datum is MSL) TPH9 Benzene Toluene benzene Xylenes observations MI-1 W-33-MW1 06/06/88 9 66 29 42 -19 76 <20 4 5 <0 5 <0 5 <0 5 FP = No, S = No W-39-MW1 10/26/88 9 66 33 85 -24 19 <20 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-36-MW1 03/02/89 9 66 33 02 -23 36 <20 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-43-MW1 08/28/89 9 66 41 49 -31 83 720 <0 5 1 7 <0 5 <0 5 FP = No, S = No W-43-Mwl 11/30/89 9 66 41 70 -32 04 <20 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-43-Mu1 03/01/90 9 66 42 03 -32 37 44 <0 5 0 58 <0 5 1 3 FP = No, S = No W-45-MW1 05/30/90 9 66 45 29 -35 63 38 <0 5 0 59 <0 5 0 5 FP = No, S = No 08/24/90 9 66 NM NM Not analyzed -- Well dry FP = NC, S = NC 11/19/90 9 66 NM NM Not analyzed - Well dry FP = NC, S a NC 02/25/91 9 66 NM NM Not analyzed - Well dry FP = NC, S = NC 05/29/91 9 66 NM NM Not analyzed Well dry FP = NC, S = NC 08/28/91 9 66 NM NM Not analyzed Well dry FP = NC, S = NC 11/06/91 9 66 NM NM Not analyzed -- Well dry FP = NC, S = NC 03/04/92 9 66 NM NM Not analyzed Well dry FP = NC, S = NC 05/21/92 9 66 NM NM Not analyzed -- Well dry FP = NC, S = NC 08/18/92 9 66 NM NM Not analyzed Well dry FP = NC, S = NC 11/13/92 9 66 NM NN Not analyzed -- Well dry FP = NC, S = NC W-46-MW1 03/26/93 9 66 46 93 -37 27 97 <0 5 2 9 0 8 3 6 FP = No, S = No W-45-MW1 06/04/93 9 66 45 86 -36 20 <50 <0 5 <0 5 <0 5 <0.5 FP = No, S = No MW-2 W-33-MW2 06/06/88 10 19 NM NM 99000 5700 48800 5000 25000 FP = NC, S = NC W-38-MW2 10/26/88 10 19 34 68 -24 49 172000 9400 82600 4600 26000 FP = No, S = No W-36-MW2 03/02/89 10 19 33 56 -23 37 163000 2464 25080 3270 16990 FP = No, S = No W-43-MW2 08/28/89 10 19 41 98 -31 79 220000 6800 44000 4000 21000 FP = No, S = No W-45-MW2 11/30/89 10 19 42 29 -32 10 200000 16000 35000 2700 14000 FP = No, S = No W-43-MW2 03/01/90 10 19 42 57 -32 38 240000 11000 40000 2800 17000 FP = No, S = No W-46-MW2 05/30/90 10 19 45 87 -35 68 260000 27000 66000 5100 27000 FP = No, S = No 08/24/90 10 19 NM NM Not analyzed Well dry FP = NC, S = NC 11/19/90 10 19 NM NM Not analyzed - Well dry FP = NC, S = NC 02/25/91 10 19 NM NM Not analyzed -- Well dry FP = NC, S = NC 05/29/91 10 19 NM NM Not analyzed - Well dry FP = NC, S = NC 08/28/91 10 19 NM NM Not analyzed Well dry FP = NC, S = NC 11/06/91 10 19 NM NM Not analyzed Well dry FP = NC, S = NC 03/04/92 10 19 NM NM Not analyzed -- Well dry FP = NC, S = NC 05/21/92 10 19 NM NM Not analyzed Well dry FP = NC, S = NC 08/18/92 10 19 NM NN Not analyzed Welt dry FP = NC, S = NC 11/13/92 10 19 NM NM Not analyzed - Well dry FP = NC, S = NC W-48-MW2 03/26/93 10 19 48 35 -38 16 480000 14000 75000 6500 37000 FP = No, S = No W-46-MW2 06/04/93 10 19 46 55 -36 36 170000 15000 65000 5000 24000 FP = No, S = No See notes on page 3 of 3