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Page 3 of 7 i Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#4932 16 E Harding Way Stockton CA t;gV,a X _ �Q =Well, 'Depth's-' Groundwater LPH Groundwater Ethyl- Xylenes -'MtBE MtHE r Wella°1?'v r .trate f�E vaiion -to Waber-,> Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) - 8020 (8020MM) k DO r lYumbe�� Sarnpfed ";(tt,,MSL)a5r({t,�IOC)s,"-'{it.MSL)' (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) 1(mglL) MW-6 07/20/01 P 1150 2743 -1593 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 2 34-1 72 01/15102 P 2856 -1706 000 076 <50 000 <500 <500 <500 <500 44 000 65 000 - 04/11/02 P 2784 -1634 000 072 <50 000 <500 <500 <500 <500 61 000 57 000 38 07/12/02 P 2900 -1750 000 -116 31 000 <200 <200 <200 <200 67 000 43 000 32 11110102' P 3143 -1993 000 -243 30 000 z <200 <200 <200 <200 42 000 57,000 1008 01/30/03 P 3068 -1918 3 000 075 <25 000 <250 <250 <250 <250 50 000 48 000 1 056 04/28/03 P 2996 -1846 000 072 <50 000 <500 <500 <500 <500 — 30 000 127 07129103" P 3144 -1994 000 -148 <50 000 5 <500 <500 <500 <500 — 37 000 10/08-09103 P 3298 -2148 000 -164 35 000 17 <250 <250 <250 <250 — 32 000 1091 01/12/04 P 3245 -2095 000 053 9 700 <500 <500 <500 <500 -- 21 000 I 160 04/26/04 P 3096 -1946 000 149 19,000 <0 5o <0 50 <0 50 <0 60 — 16,000 — 1 MW-7 07120/01 P 1100 2673 -1573 000 — <50 <0 50 <0 50 <0 50 <0 50 180 <2 0 10/22/01 P 2862 -1762 000 -189 120 43 <0 50 <0 50 <0 50 78 <2 0 1 1 81 01/15/02 P 2798 -1698 000 064 94 <0 50 14 <0 50 092 33 <0 50 36 04111102 P 2715 -1615 000 083 <50 <0 50 <0 50 <0 50 <0 50 27 07 36 07112102 P 2903 -1803 000 -188 <50 <0 50 075 <0 50 <0 50 <2 5 <0 50 25 1 i/20102 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 1198 04/28/03 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 — 10108/03 P 3224 -2124 000 -155 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 130 01/12/04 P 3171 -2071 000 053 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 1180 04/28/04 P 3026 -1926 000 145 <50 <0 50 <0 5o <0 50 <0 50 — <0 5o I - 1 MW-8 0720101 P 1299 2844 -1545 000 — <50 <0 50 <0 50 <0 50 <0 50 6 <2 0 1022101 P 3040 -1741 000 -196 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 138 01/15102 P 2996 -1697 000 044 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 1 -- 04/11/02 P 2916 -1617 000 080 <50 <0 50 <0 50 <0 50 <0 50 <2 5 068 1 -- 07l12102 P 2999 -1700 0 00 -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 11 26 01/30/03 -- — — -- -- Well unable to be sampled car parked on well 0428!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 — IOM-09103 P 3382 -2083 000 -046 <50 <0 50 059 <0 50 075 — <0 50 1185 01/12/04 P 3356 -2057 000 026 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 1260 04126/04 -- — — -- -- Well unable to be sampled car parked on well I i Project/ARCO/49321ReportuTables2Q04 gwtables4932 As I