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Page 3 of 7 Table 5 Groundwater Elevation and Analytical Data Former ARCO Service Station#4932 16 E Harding Way Stockton CA Well Depth Groundwater LPH Groundwater Ethyl- Xylenes MtBE MTBE 3 Well Date Elevation to Water Elevation Thickness Elevation TPI-Ig Benzene Toluene benzene (total) 8020 (802018260) DO Number Sampled (ft MSL) (ft TOC) (ft MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) _(mwo <5 000 <50 <50 <50 <50 57,000 67 000 MW-0 07/20/01 P 11 50 2743 -1593 000 — — 10!22!01 P 2932 -1782 000 -189 <20 000 <200 <200 <200 <200 69000 82 000 234-172 01/15/02 P 2856 -1706 000 076 <50,000 <500 <500 <500 <500 44 000 65,000 — 04111/02 P 2784 -1634 000 072 <50 000 <500 <500 <500 <500 61,000 57 000 38 07112/02 P 2900 -1750 000 -1 16 31,000 " <200 <200 <200 <200 67 000 43 000 32 11120!02' P 3143 -1993 000 243 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 Goo 072 <50 000 <500 <500 <500 <500 — 30 000 127 07129!03' P 3144 1994 000 -148 <50 000 5 <500 <500 <500 <500 — 37 000 — 10/08103 3298 -2148 000 -154 35 000 <250 <250 <250 <250 — 32 000 — 01/13104 P 3245 -2095 000 053 9,700 7 <500 <500 <500 <500 — 21,000 — MW-7 07/20/01 P 1100 2673 -1573 000 -- <50 <0 50 <0 50 <0 50 <0 50 180 <2 0 — 10/22/01 P 2862 -1762 000 -1 89 120 43 <0 50 <0 50 <0 50 78 <2 0 181 01/15/02 P 2798 -1698 000 064 94 <0 50 14 <0 50 092 33 <0 50 36 04/11102 P 2715 -1615 000 083 <50 <0 50 <0 50 <0 50 <0 50 27 07 36 07/12/02 P 2903 -1603 000 -188 <50 <0 50 075 <0 50 <0 50 <2 5 <0 50 25 11/20/02 P 3069 1969 000 -166 260 '" 83 078 <0 50 <0 50 41 63 097 01/30/03 P 2990 1890 000 079 380 55 054 <0 50 <0 50 85 <0 50 198 04!28103 P 2920 -1820 000 070 330 <0 50 <0 50 <0 50 <0 50 — <0 50 186 07129103' P 3069 -1969 000 -149 <50 5 <0 50 <0 50 <0 50 <0 50 — <0 50 — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 10/08/03 32 24 -21 24 0 00 -1 55 — 01/12/04 P 31 71 -2071 000 053 <50 <0 50 <0 50 <0 50 <0 50 -- <0 50 — MW-8 07120101 P 1299 2844 -1545 000 — <50 <0 50 <0 50 <0 50 <0 50 6 <2 0 — 10/22/01 P 3040 -1741 000 -196 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 1 38 01/15/02 P 2996 -1697 000 044 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 — 04/11/02 P 2916 -1617 000 080 <50 <0 50 <0 50 <0 50 <0 50 <2 5 068 — 07/12/02 P 2999 -1700 000 -083 <50 <0 50 089 <0 50 053 <2 5 <0 50 21 11/20/02 P 3047 -1748 000 -048 <50 <0 50 <0 50 <0 50 <0 50 <2 5 066 126 01/30/03 -- — — — — Well unable to be sampled car parked on well 04/28/03 -- — — — — Well unable to be sampled car parked on well 07128103' P 3336 -2037 000 — <50 5 <0 50 <0 50 <0 50 <0 50 — <0 50 — 10/08103 3382 -2083 000 -046 <50 <0 50 059 <0 50 075 -- <0 50 — 01/12104 3356 -20 57 000 026 <50 <0 50 <0 50 <0 50 -CO 50 -- <0 50 — Project/ARCO/4932/Reports/Tables/gwtables4932-1004