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Table 1 Pagof 26 Groundwater Elevation and Analytical Data ARCO Service Station#2133 2908 Benjamin Holt Or Stockton,California Well Depth Product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) mgll E-3 10/11/90 Dry — - — — — - (cont) 1216190 Dry -- — - — 2/11191 1830 — -1601 — - - - — 2125191 1826 -- -1597 004 - 4123191 1779 -1550 047 7115191 Dry — -- — — — 1018191 Dry - 1122191 Dry — — - — 4122/92 Dry - — 7129192 Dry — 10/29192 Dry -- - - -- — -- 1/27/93 1669 - -1440 -- 57,000 2 700 180 660 1,900 — 4129193 1493 -1264 1 76 32 000 3 400 140 930 2 500 815193 1670 -1441 -1 77 27 000 1,800 69 670 1,400 - 1111 M3 17 14 -- -1485 044 47 000 1 700 <50 740 2,000 3121194 1660 -- 1431 054 24,000 1 500 86 620 1 500 - 6127194 1625 — -1396 035 19,000 1 500 36 670 1,400 — 9129194 1704 — -1475 -079 24,000 1,600 77 630 1,300 1216194 1668 -- -1439 036 21 000 2 700 58 890 1900 — 318195 1420 -- Al 91 248 94,000 1,600 130 640 2,600 — — 611195 1268 -- -1039 1 52 58,000 1,900 24 590 2,500 — 9/11195 1501 — -1272 -233 29 000 1 900 <50 640 1900 -- 1215/95 1522 -- -1293 -021 — — -- -- — — — 3118196 1040 — -811 482 150W 480 12 390 660 -- 6/18/96 1105 — -876 -0 65 -- — -- -- -- — — 9125196 1352 -- -11 23 -247 7,600 160 <5 160 300 <50 1214196 1293 — -1064 059 -- — — -- -- — — 3119197 P 837 — -6 08 4 56 4 400 46 6 46 99 016 615197 P 1006 — -777 -1 69 -- — — -- -- -- 019 8119197 P 11 53 — -924 -1 47 3,900 50 10 41 28 <50 013 11/25197 P 11 70 — -9 41 -017 -- -- — -- -- -- — 3/20/98 P 540 — -311 630 <50 <0 50 <0 50 <0 50 <0 50 <50 2 6/24/98 742 -- -513 -2 02 -- -- -- — — -- — 9110198 P 919 -- -690 -177 1,440 146 391 127 5 31 651 NO 12117/98 9 28 -- -699 -009 -- -- -- -- -- -- -- 7G600-019-011GW Tables