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7eb 1 Page 9 of 30 y Groundwater Elevation and Analytical Data _ ARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,CA Well Depth Product Groundwater Groundwater Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPI-Ig Benzene Toluene Ethylbenzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) MW-4 3/8195 254 1431 -1177 -- <50 <0 5 <0 5 <0 5 <0 5 6/2/95 1286 -- -1032 145 <50 <05 <0 5 <0 5 <0 5 9/11/95 1504 -- -1250 -218 <50 <0 5 <0 5 <0 5 <0 5 - 12/5/95 1546 -- -1292 -042 <50 <0 5 <0 5 <0 5 <0 5 - 3/18/96 1025 -- -771 5 21 58 <0 5 <0 5 <0 5 <0 5 6/18/96 1123 -- -869 -098 <50 <0 5 <0 5 <0 5 <0 5 <5 - 9/25/96 1365 -- -11 11 -242 <50 <0 5 <0 5 <0 5 <0 5 <5 1214/96 1305 -1051 060 <50 <0 5 <0 5 <0 5 <0 5 <5 3/19/97 NP 865 — -611 4 40 <50 <0 5 <0 5 <0 5 <0 5 - 1 6 6/5/97 NP 1036 -- -781 -1 70 <50 <0 5 <0 5 <0 5 <0 5 <5 1 6 8119/97 NP 1176 -- -922 -141 <50 <0 5 <0 5 <0 5 <0 5 <5 0 4 11/25/97 IVP 1191 -- -937 -015 <50 <0 5 <0 5 <0 5 <0 5 <5 -- 3/19/98 P 567 -- -313 624 <50 <0 5 <0 5 <0 5 <0 5 <5 3 7 6124198 P 771 -- -517 -204 <50 <0 5 <0 5 <0 5 <0 5 <5 3 0 9110/98 NP 940 - -6 86 -169 <50 <0 5 <0 5 <0 5 <0 5 <5 - 12/17/98 NP 945 -- -691 -005 <50 <0 5 <0 5 <0 5 <0 5 <5 3110/99 P 723 -- -4 69 222 <50 <0 5 <0 5 <0 5 <0 5 <5 2 7 6/22/99 NP 937 -- -6 83 -214 <50 <0 5 <0 5 <0 5 <0 5 <5 3 9 9/13199 NP 1100 -846 -1 63 <50 <0 5 <0 5 <0 5 <0 5 <5 2 9 12/16/99 NP 1090 -- -836 010 <50 <0 5 <0 5 <0 5 <0 5 <2 5 1 1 3/23100 P 617 - -3 63 4 73 <50 <0 5 <0 5 <0 5 <0 5 <2 5 5 2 6121100 P 848 -- -594 -231 <50 <0 5 <0 5 <0 5 <0 5 <25 41 9113100 NP 1020 -- -766 -172 <50 <0 5 <0 5 <0 5 <0 5 <2 5 274 12/15/00 P 9 65 -- -711 055 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 1 28 3/2101 P 7 54 -500 211 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 3 8 5/10/01 P 746 — -492 008 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 2 1 i