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Table 2 Groundwater Elevation Analytical Data Chevron Service Station#9-4275 2905 Benjamin Halt Drive Stockton,California Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) MtBE ID Sampled A MSL) (ft,MSL) Of TOC) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-4 03/22/89 2 81 -1348 1629 NO NO NO NO NO 06/12/89 -1416 1697 ND NO NO NO NO 09/07/89 -1554 1835 170 1 7 ND NO NO 12/18/89 -1499 1780 ND NO NO NO NO 03/20/90 -1459 1740 85 2 9 ND N4 0 9 07/03/90 -1524 1805 93 NO NO NO NO 10/19/90 -1677 1958 73 NO 2 8 1 5 NO 01/17/91 -1638 1919 150 NO NO NO NO -- 03/19/91 -- -- 100 NO NO NO NO - 07/18/91 -1624 1905 81 ND ND ND NO -- 10/31/91 -1671 1952 180 ND ND ND ND - 01/16/92 -1601 1882 NO NO ND 0 5 20 03/11/92 -1509 1790 -- -- -- -- 03/17/92 -1497 1778 150 29 9 7 3 0 97 06/29/92 -1659 1940 130 29 0 6 0 9 1 1 - 12/10/92 -1722 2003 NO ND NO NO NO 02/04/93 -1554 1835 64 NO NO NO ND - 05/18/93 -1323 1604 ND NO NO NO NO 08/05/93 -1402 1683 NO ND NO ND NO 11/09/93 -1471 1752 NO ND NO ND NO 01/18/94 -1412 1693 ND ND ND ND ND 06/27/94 -1363 1644 NO NO NO ND NO 09/29/94 -1483 1764 NO ND NO NO NO - 12/08/94 -1455 1736 <50 <0 5 <0 5 <0 5 <05 - 03/08/95 -1268 1549 <50 <0 5 <05 <05 <0 5 06/01/95 -1080 1361 <50 <0 5 <0 5 <0 5 1 3 09111/95 -1252 1533 <50 <05 <05 <0 5 <0 5 12/05/95 -10 77 1358 <50 <0 5 <0 5 <0 5 <05 03/18/96 -967 1248 <50 <0 5 <05 <0 5 <0 5 -- 06/18/96 -939 1220 80 <0 5 <0 5 <0 5 <05 65 09/24/96 -1099 1380 80 <05 <05 <05 0 8 52 12/04/96 -1091 1372 <50 <0 5 <0 5 <05 <0 5 36 02/25/97 -672 9 53 110 06 <05 <0 5 <0 5 16 05/06/97 -770 1051 <50, <0 5 <0 5 <0 5 <05 3,600 09/29/97 -1041 1322 <1000 <10 <10 <10 <10 2 100 11/25197 -1039 1320 <50 <0 5 <05 <0 5 <0 5 48 6 Chevron1942751QMR19 4275 NF