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5of7 Table 1 Groundwater Elevation and Analytical Data ARCO Seance Station#4932 1B E Harding Way Stockton CA 1 W Depth's 'Groundwater LPH Groundwater Ethyl Xylenes MtBE MtBE k XY, ell'- A,A* - r Weli,�Er.� � �x..�.'.,S� �'+-max a�..� .� Date' „ „Elevatroni- to Water;U 4 Elevation= T- Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (802018260) I' DO rNirmber;�` 'Sampl'W ;s '_�(#�'IUIS!)` N(ftTOC) f„(it<MSL1 (R1' Change(R) (ppb) (pPb) (ppb) (ppb) (ppb) (Ppb) I(mgA-) (SVE-1) 07/28103 29 74 -1790 000 – Insufficient amount of water in well for sample collection (cont) 10/17/03 -- -- – – – Not sampled well dry 1 01/12/04 – – – – – Not sampled well dry 04128/04 2980 -17 96 000 Insufficient amount of water in well for sample collection 1 DMW-1 04/11/02 P 1198 2810 -1612 000 – <500 9 6 <5 0 <5 0 <5 0 230 140 i – 07112l02 P 29 25 -1727 000 -1 15 55 <0 50 <0 50 <0 50 <0 50 72 64 27 11/20/02 P 3164 -1966 000 -2 39 <50 0 76 063 <0 50 15 18 21 016 01/30/03 – – – Well unable to be sampled located in construction area 1 0488103 P 3020 -1822 000 – <50 <0 50 <0 50 <0 50 <0 50 – 13 1 2 74 0788103` P 3164 -1966 000 -144 50 5 <0 50 <0 50 <0 50 <0 50 -- 52 – 10ARV03 P 3323 -2125 000 -159 <50 <0 50 0 63 <0 50 0 81 – 3 3 1035 01/12104 P 3271 -20 73 000 0 52 <50 <0 50 <0 50 <0 50 <0 50 – 2 5 04126104 P 3013 4815 000 258 <100 <1 0 <1 0 <1 0 <1 0 – 22 -- DMW-2 07/12/02 P 1110 28 36 -1726 000 – <50 10 16 0 62 2 0 130 8 5 12 8 11/20/02 P 30 84 -1974 000 -248 <50 <0 50 <0 50 <0 50 12 41 64 1327 01/30/03 P 30 04 -1894 000 080 <50 <0 50 <0 50 <0 50 <0 50 40 33 1521 0488/03 P 29 33 -1823 000 071 <50 <0 50 <0 50 <0 50 <0 50 -- 0 76 1 1 75 0788103* P 3088 -1978 000 -155 <50 5 <0 50 <0 50 <0 50 0 61 -- <0 50 1 – 10/08/03 P 3241 -2131 000 -153 <50 <0 50 0 91 <0 50 1 1 – 14 1204 01/12/04 P 3188 -2078 000 0 53 53 96 24 0 8 31 – 1 3 0486104 P 3230 -2120 000 -042 <50 0 51 0 78 <0 50 085 -- 24 ( – DMW-3 07/12/02 P 1149 2894 -1745 000 – 90 <0 50 13 <0 50 10 1600 140 27 11/20102 P 3147 -1998 000 -253 <50 <0 50 063 <0 50 16 14 16 1 1 57 01/30/03 P 3070 -1921 000 077 <50 <0 50 <0 50 <0 50 0 65 32 3 7 4 35 04/28/03 P 29 98 -1849 0 00 0 72 <50 <0 50 <0 50 <0 50 <0 50 – 5 9 1313 07128/03* P 3150 -2001 0 00 -152 <50 s <0 50 <0 50 <0 50 <0 50 – 3 0 I – 10108-09103 P 3305 -2156 000 -155 <50 ' <0 50 0 90 <0 50 1 1 – 2 4 028 01112/04 P 3249 -2100 000 056 <50 <0 50 <0 50 <0 50 <0 50 – 1 1 – 04/26104 P 3101 -1952 000 1 48 <50 <0 50 062 <0 50 065 – 31 – EW-1 04111/02 P 1183 2795 -1612 000 – <200 000 9 900 40 000 4 700 24 000 550 000 520 000 – 07/12/02 P 29 04 -1721 000 -109 350,000 13 000 49 000 6 100 34 000 320 000 460 000 2 7 1180102 3147 -1964 000 -243 Not sampled LPH sheen present 01/30/03 P 2930 -1747 000 217 220,000 8 000 31 000 4 400 23 000 140 000 200 000 0 83 0488103 2958 -1775 000 -028 Well unable to be sampled connected to remedial system 1 0789/03* NP 3109 -1926 000 -151 220 000 s 3 700 11,000 3200 16 000 -- 97 000 – 10108-=03 NP 40 90 -2907 000 -981 37,000 ' 1 100 1 600 360 2 400 -- 25 000 – 01/12/04 NP 3911 -2728 000 179 11 000 <250 <250 <250 280 -- 17 000 0486/04 3049 -1866 000 862 <26,000 270 <260 <250 520 – 5,800 I i Project/ARCO/4932/Reportsaablesf2004 gwtables4932 xfs