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TABLE 1 GROUNDWATER MONITORING DATA Former Unocal Service Station No 2859 1665 Pacific Avenue Stockton, California (page 2 of 3) Well/ Elevation of Static Groundwater Sample Top of Casing Water Elevation Ethyl- Total Number Date (datum 1s MSL) Level (datum is MSL) TPHg Benzene Toluene benzene Xylenes Observations MW-3 W-33-MW3 06/06/88 10 60 30 12 -19 52 170 1 0 <0 5 <0 5 1 6 FP = No, S = No W-38-MW3 10/26/88 10 60 34 36 -23 76 200 1 3 <0 5 <0 5 1 5 FP = No, S = No W-36-MW3 03/02/89 10 60 33 87 -23 27 120 1 1 <0 5 0 7 1 FP = No, S = No W-44-MW3 08/28/89 10 60 42 18 -31 58 1000 1 2 2 1 4 1 11 FP = No, S = No W-45-MW3 11/30/89 10 60 42 58 -31 98 360 2 1 1 4 B 4 17 FP = No, S = No W-43-MW3 03/01/90 10 60 42 82 -32.22 300 1 6 <0 5 3 6 6 4 FP = No, S = No W-36-MW3 05/30/90 10 60 46 12 -35.52 760 <0 5 9 0 7 1 7 6 FP = No, S = No 08/24/90 10 60 NM NM Not analyzed - Well dry FP = NC, S = NC 11/19/90 10 60 NM NM Not analyzed -- Well dry FP = NC, S = NC 02/25/91 10 60 NM NM Not analyzed Well dry FP = NC, S = NC 05/29/91 10 60 NM NM Not analyzed -- Well dry FP = NC, S = NC 08/28/91 10 60 NM NM Not analyzed - Well dry FP = NC, S = NC 11/06/91 10 60 NM NM Not analyzed Well dry FP = NC, S = NC 03/04/92 10 60 NM NM Not analyzed -- Well dry FP = NC, S = NC 05/21/92 10 60 NM NM Not analyzed -- Well dry FP = NC, S = NC 08/18/92 10 60 NM NM Not analyzed -- Covered by Soil FP = NC, S = NC 11/13/92 10 60 NM NM Not analyzed -- Well dry FP = NC, S r NC 03/26/93 10 60 NM NM Not analyzed -- Bell dry FP = NC, S = NC W-45-MW3 06/04/93 10 60 45 77 -35 17 1600 260 120 34 97 FP = No, S = No MW-4 W-43-MW4 08/28/89 9 58 41 63 -32 05 150 <0 5 <0 5 <0 5 1 4 FP = No, S = No W-42-MW4 11/30/89 9 58 41 75 -32 17 86 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-43-MW4 03/01/90 9 58 42 18 -32 60 100 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-45-MW4 05/30/90 9 58 45 47 -35 89 130 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-51-MW4 08/24/90 9 58 51 23 -41 65 130 <0 5 0 7 0 9 1 2 FP = No, S = No W-50-MW4 11/19/90 9 58 49 68 -40 10 93 <0 5 <0 5 0 6 0 5 FP = No, S = No W-51-MW4 02/25/91 9 58 50 45 -40 87 110 <0 5 <0 5 0 8 1 5 FP = No, S = No W-50-MW4 05/29/91 9 58 50 03 -40 45 290 1 4 1 0 2 2 3 2 FP = No, S = No W-51-MW4 08/28/91 9 58 51 02 -41 44 180 <0 5 <0 5 1 0 <0 5 FP = No, S = No W-50-NW4 11/06/91 9 58 54 70 -45 12 90 0 5 1 3 0 7 1 8 FP = No, S = No W-48-MW4 03/04/92 9 58 48 92 -39 34 120 <0 5 <0 5 0 7 2 2 FP = No, S = No W-49-MW4 05/21/92 9 58 49 65 -40 07 160 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-52-MW4 08/18/92 9 58 52 79 -43 21 3000 <0 5 0 77 1 4 1 5 FP = No, S = No W-52-MW4 11/13/92 9 58 52 87 -43 29 290 <0 5 2 1 2 2 2 6 FP = No, S = No W-47-MW4 03/26/93 9 58 47 95 -38 37 330 2 0 1 1 1 7 1 8 FP = No, S = No W-46-MW4 06/04/93 9 58 46 21 -36 63 73 <0 5 <0 5 <0 5 <0 5 FP = No, S = No See notes on page 3 of 3 I