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I s • � Table 2 Groundwater Elevation Analytical Data Chevron Service Station#9-4275 2905 Benjamin Holt Drive Stockton,California Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) MtBE ID Sampled (ft,MSL) A MSL) (ft TOC) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-6 03/22/89 379 -1339 1718 4,000 35 23 110 760 06/12/89 -1401 1780 900 24 2 0 20 53 09/07/89 -1532 1911 410 16 40 12 50 - 09/07/89 (D) -- - 380 15 40 11 49 - 12/18/89 -1484 1863 2,900 24 22 100 590 03/20/90 -1440 1819 3,400 37 29 120 630 07/03/90 -1564 1943 5,500 65 89 200 1,200 10/19/90 -1625 2004 5,900 55 82 190 1,100 - 01/17/91 -1619 1998 4,900 26 51 140 830 03/19/91 -- -- 6,800 18 24 21 790 07/18/91 -1593 1972 7,600 60 65 190 800 10/31/91 -1641 2020 2,600 44 24 64 310 01/16/92 -1581 1960 5,400 120 72 250 1,000 01/16/92 (D) -- -- 4,700 110 63 230 960 03/11/92 -1485 1864 -- -- 03117/92 -1474 18 53 1,100 37 13 52 170 06/29/92 -1639 2018 850 18 90 25 200 12/10/92 -1699 2078 1,200 49 16 64 200 02/04/93 -1523 1902 1,200 31 12 58 250 -- 05/18/93 -1295 1674 2,000 58 10 170 190 - 08/05/93 -1376 1755 750 32 46 50 100 - 11/09/93 -1449 1828 1,400 29 3 8 46 190 01/18/94 -1398 1777 1,200 31 48 75 180 06/27/94 -1340 1719 150 62 ISD 0 6 19 01/18/94 -1468 1847 1,400 29 30 40 160 01/18/94 -1437 1816 1,000 19 37 28 130 03/08/95 -1233 1612 750 22 07 30 60 06/01/95 -1068 1447 3,600 110 13 240 390 09/11/95 -1240 1619 890 40 3 8 76 140 12/05/95 -1301 1680 410 67 <0 5 11 43 - 03/18/96 -951 1330 740 10 <0 5 38 66 -- 06/18/96 -917 1296 7,200 86 67 770 540 15 09/24/96 -11 00 1479 12,000 74 5 0 760 1,100 59 12/04/96 -1083 1462 1,100 83 1 0 93 63 <50 02/25/97 -663 1042 24,000 570 1,400 1,500 5,300 <50 05/06/97 -746 1125 38,000 580 790 3,000 12,000 <120 Chevron1942751QMM9 4275 NF $