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• s s Table 1 Groundwater Elevation and Analytical Data ARCO Service Station 42133 2908 Benjamin Holt Drive Stockton, California Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mglL) PR-1 3119197 NP 804 -724 401 <50 <05 <0 5 <05 <05 -- 0 3 (cont) 6/5197 NP 927 -847 123 <50 <0 5 <0 5 <0 5 <0 5 <5 0 9 8119/97 NP 1076 -996 149 <50 <0 5 <05 <0 5 <0 5 <5 0 3 11/25/97 NP 1109 - -1029 033 <50 <0 5 <0 5 <0 5 <0 5 <5 -- 3/19/98 P 458 -378 651 <50 <0 5 <0 5 <0 5 <05 <5 21 6/24/98 Well box inaccessible 9110/98 NP 848 -768 -- <50 <0 5 <0 5 <05 <0 5 <5 -- 12/17/98 NP 847 -767 001 <50 <0 5 <0 5 <0 5 <0 5 <5 -- 3110/99 P 632 -552 215 <50 <05 <0 5 <0 5 <0 5 <5 47 6122199 NP 813 -733 -1 81 <50 <0 5 <0 5 <0 5 <0 5 <5 29 9/13199 NP 984 -- -904 1 71 <50 <0 5 <0 5 <0 5 <0 5 <5 25 12/16/99 NP 973 -893 Oil <50 <0 5 <0 5 <0 5 <0 5 <2 5 47 3/23/00 P 520 -440 453 <50 <0 5 <0 5 <0 5 <0 5 <2 5 26 6/21100 P 691 -611 1 71 <50 <0 5 <0 5 <0 5 <0 5 <25 46 9113/00 NP 912 -832 -221 <50 <0 5 <0 5 <0 5 <0 5 <25 132 12/15/00 P 863 -783 049 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 1 06 312/01 P 698 -618 165 <50 0 <0 500 <0 500 <0 500 0 502 <250 41 5/10/01 Well inaccessible 8122/01 Well inaccessible 1215/01 Well inaccessible 3/11/02 Well inaccessible 616/02 P 783 -703 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5 018 9124/02 P 979 -899 -1 96 <50 <050 <0 50 <0 50 <0 50 <2 5 035 12/17/02 P 846 — -766 133 <50 <0 50 <0 50 <0 50 <050 <20 — PR-2 8/26/88 065 - -- - -- -- <0 5 2 <0 5 3 -- 11/28/88 <0 5 <0 5 <0 5 <0 5 2/27189 - <0 5 <0 5 <0 5 <0 5 5/30189 - -- 8/22/89 <0 5 <0 5 <0 5 <0 5 - 1214/89 - - - 1/4/90 1574 -1509 - 211/90 1552 - -1487 0 22 -- 2/15/90 1549 -1484 003 Projects/ARCO/2133/Reports/Tableslgwtables2133 As 26