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Page 4 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 i Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (802018260) DO Number Sampled (ft MSL) (ft TOC) (ft MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mglL) MW 9 07/20/01 P 1124 2649 -1525 000 — 200 1 2 056 <0 50 1 7 2 8 <2 0 — 10/22101 P 2836 -1712 000 -187 690 "" 3 3 0 93 14 12 <2 5 <2 0 12 01115102 P 2789 1665 000 047 540 "" <5 0 <50 <5 0 <50 <25 <0 50 2 6 04/11102 P 2703 -1579 000 0 86 170 "* 1 2 <0 50 <0 50 <0 50 3 5 <1 0 36 07112102 P 2794 -1670 000 -091 130 "" <0 50 16 <0 50 0 87 <2 5 <0 50 3 1 11120102 P 3052 -1928 000 -2 58 120 '" 075 066 <0 50 <0 50 <2 5 <0 50 030 01/30103 P 29 74 -18 50 000 0 78 100 1 5 067 <0 50 <0 50 <2 5 <0 50 042 04/28103 P 2906 -17 82 000 0 68 95 <0 50 <0 50 <0 50 <0 50 -- <0 50 165 07129!03' P 3024 -19 00 0 00 -1 18 130 5 0 83 <0 50 <0 50 <0 50 — <0 50 — 10/08103 31 84 -20 60 0 00 -160 <50 <0 50 078 <0 50 0 77 — <0 50 — 01/12104 P 3158 -20 34 0 00 0 26 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — MW-10 07112102 P 1132 28 85 -1753 0 00 — <50 <0 50 14 <0 50 052 <2 5 <0 50 2 8 11/20102 P 31 41 -20 09 0 00 -2 56 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 0 92-1 03 01/30103 P 3059 -1927 000 0 82 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 192 04/28/03 P 29 83 -18 51 0 00 076 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 1 62 07129103' P 3142 -20 10 0 00 -1 59 <50 5 <0 50 <0 50 <0 50 <0 50 — <0 50 — 10/08103 3296 -21 64 000 -1 54 <50 <0 50 14 <0 50 1 1 — <0 50 — 01/12/04 P 3233 -21 01 000 063 <50 <0 50 050 <0 50 051 — <0 50 — MW-11 07/12/02 P 1105 2903 -1798 000 — <50 <0 50 1 4 <0 50 0 81 <2 5 <0 50 3 0 11/20102 P 3173 -2068 000 -2 70 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 0 53 01/30103 P 3090 -1985 000 0 83 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 173 <50 <0 50 <0 50 <0 50 <0 50 <0 50 132 04128!03 P 30 14 -19 09 0 00 0 7fi — 07129103' P 3168 -2063 000 -154 <50 5 <0 50 <0 50 <0 50 <0 50 -- <0 50 — 10/08103 3330 -2225 000 -162 <50 <0 50 078 <0 50 0 87 -- <0 50 — 01/12104 P 32 64 -2159 000 066 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 - SVE-1 09/05100 P 1184 2645 -1447 000 — 66 600 1,770 8 000 2 550 12 900 1,140' — — 11/02100 P 2711 -1513 000 -066 4,750 152 469 164 823 212 21211 200 28 03/05101 P 2640 -14 56 000 057 72 300 2090 10 100 2 710 14 800 12,100 12 10013 720 51 05108!01 P 26 04 -1420 000 0 36 45 300 1 560 5 170 1 850 9 490 6 900 6900/4930 0 31 07120!01 P 2749 -1564 ' 0 01 -144 Not sampled 0 01 ft LPH present 10122!01 P 2893 -1708 ' 0 01 -144 Not sampled 0 01 ft LPH present 01/15/02 — — -- -- Not sampled well dry 04111/02 NP 2788 -16 04 000 104 87 000 5200 16 000 3 900 20 000 20,000 19 000 3 0 07/12/02 NP 2898 -1714 000 -1 10 85 000 4,100 8 900 3 700 18 000 13 000 15 000 2 2 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 2974 -17 90 000 — Insufficient amount of water in well for sample collection 10/08103 -- -- — — — Insufficient amount of water in well for sample collection 01112104 NP 2980 -17 96 000 — Insufficient amount of water in well for sample collection Project/ARCO/49321ReponsfTables/gwtables4932-1004