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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station #2133 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) E-4 9113199 NP 1077 -844 -175 107 <0 50 <0 50 0738 <0 50 8 53 23 (cont) 12/15/99 1065 -832 012 -- -- -- -- -- -- 1 1 3123100 NP 5 97 -364 4 68 <50 <0 50 <0 50 <0 50 <0 50 <250 1 7 6121100 821 -588 224 -- -- -- -- -- -- 0 88 9113100 NP 1000 -767 179 <50 <0 50 <0 50 <0 50 <0 50 <2 50 1 50 12/15/00 948 -715 0 52 -- - - -- -- -- 0 71 311101 P 740 -507 208 777 224 <5 00 351 108 60 3 2 8 5110101 751 - -518 -011 -- -- -- -- -- -- 25 8120101 P 1027 -794 -276 720 14 36 28 69 39 -- 12/5/011 941 -708 0 86 -- -- -- -- -- -- -- 3/11/02 P 7 64 -531 177 680 97 1 4 23 41 45 188 616102 860 627 0 96 -- -- -- -- -- -- 076 9124102 P 1043 -810 -183 150` 0 64 1 2 <0 50 077 23 058 12117/02 864 -- -631 179 — — — — -- — — E-5 8126188 2 45 -- -- -- 2,690 390 270 870 - 11/28/88 580 140 110 420 - 2127/89 1,770 200 200 1,400 5130189 2,430 36 260 1,670 -- - 8/22/89 - 3,110 130 240 1,720 12/4189 - -- - 600 40 120 1,030 114190 1751 -1506 -- -- -- - -- -- 211l90 1732 -1487 019 - - 2115190 1729 -1484 003 - - - 2/22190 1907 1662 -178 - -- -- -- -- 3/8/90 1703 1458 204 272 394 978 532 415!90 1731 -1486 -028 -- - -- - 4119190 1726 -1481 005 5110190 1765 -1520 -039 5124190 17 61 -1516 004 - - 615190 1757 1512 004 -- -- -- -- 6/19/90 1849 1604 -092 2,150 30 200 780 7/12/90 1837 -1592 012 -- -- -- -- 8/16/90 1865 -1620 -028 Projects/ARCO/2133/Reports ables/gwtables2133 As 7