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Page 2 of 6 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#4932 16 E Harding Way Stockton,CA 4,4-'E, ;= WellDepth ` Groundwater 'LPH Groundwater ,t - Ethyl -,IXylenes MTBE__- =MSE�Ik' -S" - xWellWaT -JData,�'_P i>i'Elevatton-s toWatef' «�Elevatlon' Thickness Elevation TPHg Benzene Toluene benzenej (total) 8020 '(8020//8260) DO -- Number Sam4led' i (ft,MSL) -(1t,TOC)—- �(ft,MSL) * eft) Change(ft) ` (ppb) (Ppb) (ppb� }..(ppb) (ppb) " - (Ppb) (mglL) MW-3 04128/03 P 2970 -18 00 000 066 1,000 34 22 45 92 - 0 88 238 (cont) 07129103* P 3110 -1940 000 -140 76 000 5 2,300 6,500 3 000 10 000 - <500 -- 10/08-09103 P 3265 -2095 000 -1 55 <50 <0 50 <0 50 <0 50 <0 50 - 076 038 01/12104 P 3214 -20 44 000 0 51 <50 <0 so <0 50 <0 5o <0 50 -- 079 130 MW-4 09/05/00 P 1198 2663 -1465 000 - 166 000 10 500 43 600 5 230 25 400 708 000 -- - 11/02/00 P 2732 1534 000 -069 180,000 9 400 42 600 5 260 26 900 376 000 350 000 3 3 03/05/01 P 2663 -1465 000 069 165 000 10 700 45,300 5,020 26 500 596 000 466,000 4 2 05/08/01 P 2626 -1428 000 037 149,000 9,660 45 300 5 280 26,800 372,000 500 000 044 07/20/01 P 2741 -1541 ' 002 -1 13 Not sampled 0 02 ft LPH present 10/22/01 2992 -1759 ' 046 -218 Not sampled 0 46 ft LPH present 01/15/02 P 2991 -1793 0 00 -0 34 140,000 7 900 39 000 6 000 29 000 77 000 90 000 22 04/11/02 P 2710 -1512 0 00 2 81 140 000 9,700 33,000 8 100 37 000 180 000 180 000 — 07/12/02 P 29 21 -1723 000 -211 210 000 7 100 31 000 10,000 41,000 190 000 150 000 2 6 11/20/02 P 3164 -1966 000 -243 140 000 6 300 250 000 4 000 19 000 58 000 67 000 0 01 01/30/03 - - - - - Well unable to be sampled connected to remedial system 04/28/03 - - - - - Well unable to be sampled connected to remedial system 07/29!03* P 3104 -1906 000 - 120,000 5 8,900 12 000 3 800 12 000 12 000 - 10/17/03 P 3295 -20 97 000 -191 21 000 1 500 2 700 810 4 100 - 7200 - 01112/04 P dry -- - - 28,000 220 550 110 460 - 33 -- MW-5 07/20/01 P 1178 2777 -1599 000 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 -- 10/22/01 P 29 72 -1794 000 -195 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 1 12 01/15/02 P 2907 -1729 000 065 <50 <0 50 1 8 <0 50 12 3 8 17 2 8 04/11/02 P 28 29 -1651 000 0 78 <50 <0 50 <0 50 <0 50 <0 50 3 3 2 4 0 07/12102 P 2929 -1751 000 -100 <50 <0 50 062 <0 50 <0 50 18 12 2 7 11/20/02 P 31 89 -2011 000 -2 60 <50 <0 50 <0 50 <0 50 <0 50 35 31 017 01/30/03 P 31 20 -1942 0 00 0 69 <50 <0 50 <0 50 <0 50 <0 50 13 14 140 04/28/03 P 3046 -1868 000 0 74 <50 <0 50 <0 50 <0 50 061 - 3 9 1 82 07/29/03` P 31 83 -2005 000 -137 <50,000 s 1 300 3 800 1 800 5 900 - <500 - 10/08-09103 P 3334 -2156 000 -151 <50 <0 50 12 <0 50 1 3 - 21 0 71 01/12/04 P 3294 -21 16 000 040 <50 <0 50 <0 50 <0 50 <0 50 -- 21 120 MW-6 07/20/01 P 1150 2743 -15 93 000 -- <5,000 <50 <50 <50 <50 57,000 67,000 -- 10/22/01 P 2932 -1782 000 -189 <20 000 <200 <200 <200 <200 69 000 82 000 234-1 72 01115t02 P 2856 -1706 000 076 <50,000 <500 <500 <500 <500 44,000 65 000 -- 04/11102 P 2784 -1634 000 072 <50 000 <500 <500 <500 <500 61 000 57 000 3 8 07112/02 P 2900 -1750 000 -1 16 31 000 "" <200 <200 <200 <200 6T 000 43,000 32 11120102' P 3143 -1993 000 -2 43 30 000 2 <200 <200 <200 <200 42 000 57 000 008 01/30/03 P 3068 -1918 3 000 075 <25 000 <250 <250 <250 <250 50 000 48 000 056 04/28/03 P 2996 -1846 000 072 <50,000 <500 <500 <500 <500 - 30 000 127 07/29103' P 31 44 -1994 000 -148 <50 000 5 <500 <500 <500 <500 - 37 000 — 10108-09103 P 3298 -2148 0 00 -1 54 35 000 2' <250 <250 <250 <250 — 32 000 091 01!12104 P 3245 -2095 000 0 53 9,700 <500 <500 <500 <500 — 21,000 160 Project/ARCO/49321Reports/Tables/1004 gwtables4932