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• TABLE 1 GROUNDWATER MONITORING DATA Former Unocal Service Station No 2859 1665 Pacific Avenue Stockton, California (page 3 of 3) Well/ Elevation of Static Groundwater Sample Top of Casing Water Elevation Ethyl- Total Member Date (datum is MSL) Level (datum is MSL) TPHg Benzene Toluene benzene Xylenes Observations MW-5 W-43-MW5 08/28/89 9 68 41 78 -32 10 240 <0 5 <0 5 8 1 1 9 FP = No, S = No W-43-MW5 11/30/89 9 68 41 98 -32 30 95 <0 5 <0 5 2 2 <0 5 FP = No, S = No W-43-MW5 03/01/90 9 68 42 27 -32 59 80 <0 5 <0 5 2 2 1 3 FP = No, S = No W-45-MW5 05/30/90 9 68 NM NM 30 <0 5 <0 5 <0 5 <0 5 FP = NC, S = NC W-51-MW5 08/24/90 9 68 51 20 -41 52 180 <0 5 <0 5 4 1 <0 5 FP = No, S = No W-50-MW5 11/19/90 9 68 49 69 -40 01 <20 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-51-MW5 02/25/91 9 68 50 43 -40.75 45 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-50-MW5 05/29/91 9 68 50 03 -40 35 240 <0 5 <0 5 <0 5 0 9 FP = No, S = No W-51-MW5 08/28/91 9 68 51 01 -41.33 120 <0 5 <0 5 <0 5 4 5 FP = No, S = No W-50-MW5 11/06/91 9 68 50 66 -40 98 210 5 6 25 5.6 29 FP = No, S = No W-48-MW5 03/04/92 9 68 48 96 -39 28 <50 <0 5 <0 5 <0.5 <0 5 FP = No, S a No W-49-MW5 05/21/92 9 68 49 63 -39 95 130 <0 5 <0 5 <0.5 <0 5 FP = No, S = No W-52-MW5 08/18/92 9 68 52 67 -42 99 <50 <0 5 <0 5 <0.5 <0 5 FP = No, S = No W-52-MW5 11/13/92 9 68 52 92 -43 24 <50 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-47-MW5 03/26/93 9 68 47 98 -38 30 <50 4 5 <0 5 <0 5 <0 5 FP = No, S = No W-46-MW5 06/04/93 9 68 46 30 -36 62 <50 <0 5 <0 5 <0 5 <0 5 FP = No, S = No MW-6 W-49-MW6 03/04/92 10 81 49 80 -38 99 6400 19 360 350 2700 FP = No, S a No 05/21/92 10 81 50 40 -39 59 110000 85 1100 1200 7400 FP = No, S = No W-53-MW6 08/18/92 10 81 53 66 -42 85 51000 31 830 540 4600 FP = No, S = Yes W-53-MW6 11/13/92 10 81 53 70 -42 89 53000 34 1400 870 8200 FP = No, S = No W-48-MW6 03/26/93 10 81 48 70 -37 89 80000 160 1300 1100 10000 FP = No, S = No W-46-MW6 06/04/93 10 81 46 92 -36 11 15000 <0 5 240 550 3900 FP = No, S = No MW-7 W-48-MW7 03/04/92 10 42 50 32 -39 90 98 <0 5 2 4 2 6 23 FP = No, S = No W-51-MW7 05/21/92 10 42 51 15 -40 73 <50 <0 5 <0 5 <0 5 <0 5 FP = No, S = No 08/18/92 10 42 54 48 -44 06 Not analyzed - Well purged dry FP = No, S = No W-54-MW7 11/13/92 10 42 54 43 -44 01 <50 <0 5 <0 5 <0 5 <0 5 FP = No, S = No W-49-MW7 03/26/93 10 42 49 36 -38 94 <50 4 5 <0 5 <0 5 0 5 FP = No, S = No W-47-MW7 06/04/93 10 42 47 61 -37 19 <50 <0 5 <0 5 <0 5 <0 5 FP = No, S = No Analytical results in parts per billion (ppb) Measurements in feet NM = Not measured < = Below detection limit for analytical methods used TPHg = Total petroleum hydrocarbons as gasoline NC = No subjective analysis conducted FP = Free product S = Sheen i