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! • TABLE 1 GROUND-WATER MONITORING DATA Former Unocal Service Station No 2859 1665 Pacific Avenue Stockton, California (page 2 of 3) Well/ Elevation of Static Ground-water Sample Top of Casing Water Elevation Ethyl- Total Number Date (datum is MSL) level (datum is MSL) TPHg Benzene Toluene benzene Xylenes observations MI-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 8 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 = HC 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 = HC 11/06/91 10 60 NM NM Not analyzed - Welt 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 NH 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 = NC 03/26/93 10 60 HM NM Not analyzed Well dry FP = NC, S = NC W-43 MW4 08/28/89 9 5$ 41 63 32 OS 150 <0 5 <0 5 <0 5 1 4 FP = No, S = No W-43 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 = filo 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 MW4 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 4 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-Mu4 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 i 47 95 38 37 330 2 0 1 1 1 7 1 8 FP = No, S = No see notes on page 3 of 3