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i i S Fable 1 Groundwater Elevation and Analytical Data ARCO Service Station #2133 2908 Benjamin Halt Drive Stockton, California Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well tate 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) (mg/L) E-5 9117/90 1901 -1656 036 - (cont) 9118190 1901 -- -1656 000 30,000 7,400 210 860 8,300 - 10/11/90 1911 -1666 010 12/6190 1895 -1650 016 2114191 1862 -- -1617 033 18,000 6,300 120 560 4,300 -- -- 2125191 1859 -1614 003 - - 4/23/91 1787 -- -1542 072 10,000 8,400 <050 270 680 7/15/91 dry - -- 10/8/91 ry -- -- -- - -- -- - -- --1/22192 1923 -1678 - - - 4/22/92 1831 -1586 092 28,000 4,300 130 560 1,700 - 7/29/92 1960 -1715 -129 10/29/92 dry 1/27/93 1690 - -1445 - 26,000 4,000 110 470 800 4/29193 1508 -1263 1 82 41,000 6,300 110 920 2,200 - 8/5193 1680 -1435 -172 26,000 4,700 <50 560 560 - 11/10/93 1719 -1474 -039 19,000 2,500 <50 380 690 - 3121/94 1660 -1415 059 13,000 1,700 40 300 650 6/27/94 1627 -- -1382 0 33 9,400 1,800 17 260 520 9/29/94 1723 -1478 -096 7,900 1 200 <20 200 330 1218/94 1683 1438 0 40 6,800 1,300 30 220 410 318/95 1434 -1189 249 39,000 3,000 <50 460 1,400 - 6/1/95 1275 -1030 1 59 2,300 69 <2 5 11 53 9/11/95 1475 - -1230 -200 1,200 <3 4 6 14 - 12/5/95 1541 -1296 -066 - - - - 3/18/96 960 -715 581 150 059 <0 5 <0 5 065 6/18/96 11 20 -875 -1 60 9/25/96 1312 -1067 -1 92 <50 <0 5 <0 5 <0 5 <0 5 <5 12/4/96 1265 -- -1020 047 3/19/97 NP 844 -599 421 <50 <0 5 <0 5 <0 5 <0 5 78 6/5/97 P 1020 - 775 -1 76 - - 97 8/19/97 NP 1172 -927 -1 52 <50 <0 5 <0 5 <0 5 <0 5 <5 73 11/25/97 P 1193 -948 -021 - 3/20/98 NP 561 -316 632 1,200 57 26 1 4 1 3 <5 140 Projects/ARCO/2133/Reports/Tables/gwtables2133 AS 8