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#4of6 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#4932 16 E Harding Way Stockton CA Well Depth Groundwater LPH Groundwater Ethyi- Xylenes MtBE MTBE Well k' Date y Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (8020/8260) 1>0 Number,-Sampled, - (ft,MSL) (ft{TQC) (ft MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) MW 11 07/12/02 P 1105 2903 -1798 0 00 - <50 <0 50 1 4 <0 50 081 <2 5 <0 50 3 0 11/20/02 P 31 73 2068 0 00 2 70 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 053 01/30/03 P 3090 -1985 0 00 083 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 1 73 04/28/03 P 3014 1909 0 00 076 <50 <0 50 <0 50 <0 50 <0 50 - <0 50 1 32 07/29/03' P 31 68 -2063 0 00 1 54 <50 5 <0 50 <0 50 <0 50 <0 50 <0 50 10/08-09/03 P 3330 -2225 000 -1 62 <50 7 <0 50 078 <0 50 087 <0 50 0 71 SVE 1 09/05/00 P 11 84 2645 -1447 0 00 - 66,600 1,770 8 000 2,550 12 900 1 140 - 11/02/00 P 2711 1513 0 00 -066 4 750 152 469 164 823 212 212/1 200 28 03/05/01 P 2640 -1456 0 00 057 72 300 2090 10,100 2,710 14,800 12,100 12,10013 720 51 05/08/01 P 2604 1420 0 00 036 45 300 1 560 5 170 1 850 9 490 6 900 6 900/4 930 0 31 07/20/01 P 2749 -1564 0 01 1 44 Not sampled 0 01 It LPH present 10/22/01 P 2893 1708 ` 0 01 144 Not sampled 0 01 It LPN present 01/15/02 — — - Not sampled well dry 04/11/02 NP 2788 1604 0 00 104 87 000 5200 16 000 3,900 20 000 20 000 19 000 30 07/12/02 NP 2898 1714 0 00 1 10 85 000 4 100 8 900 3 700 18 000 13 000 15 000 22 11/20/02 -- -- — Not sampled well dry 01/30/03 — — — — Well unable to be sampled connected to remedial system 04/28/03 -- -- - - Well unable to be sampled connected to remedial system 07/28/03 29 74 1790 0 00 Insufficient amount of water in well for sample collection 10/17/03 -- _ _ _ _ Not sampled well dry DMW-1 04/11/02 P 11 98 2810 -1612 0 00 - <500 9 6 <5 0 <5 0 <5 0 230 140 -- 07/12/02 P 2925 -1727 000 1 15 55 <0 50 <0 50 <0 50 <0 50 72 64 2 7 11/20/02 P 31 64 -1966 0 00 239 <50 076 063 <0 50 1 5 18 21 016 01/30/03 -- -- — — - Well unable to be sampled located in construction area 04/28/03 P 30 20 -1822 0 00 - <50 <0 50 <0 50 <0 50 <0 50 13 274 07/28/03 P 31 64 -1966 0 00 144 50 5 <0 50 <0 50 <0 50 <0 50 52 -- 10/08/03 P 3323 -2125 0 00 -159 <50 <0 50 063 <0 50 081 33 035 DMW 2 07/12/02 P 11 10 28 36 -1726 0 00 - <50 1 0 1 6 0 62 2 0 130 8 5 2 8 11/20/02 P 30 64 -19 74 0 00 2 48 <50 <0 50 <0 50 <0 50 1 2 41 64 3 27 01/30/03 P 30 04 -18 94 0 00 080 <50 <0 50 <0 50 <0 50 <0 50 40 33 521 04/28/03 P 29 33 -1823 000 071 <50 <0 50 4 50 <0 50 <0 50 - 076 1 75 07128103` P 3088 19 78 000 155 <50 5 <0 50 <0 50 <0 50 061 <0 50 - 10/08103 P 3241 -2131 000 -153 <50 <0 50 091 <0 50 1 1 14 2 04 Project/ARCO/49321Reports/Tables/4Q03 gwtables4932 As