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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 A MSL) A M5L) (ft TOC) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-1 05/06/97 -801 1025 500 3 9 2 4 26 140 9 0 (cont) 09/29/97 -1018 1242 1200 4 0 1 3 13 24 430 11/25/97 -1021 1245 1`100 6 5 <50 33 18 67 03/26/98 -387 611 380 1 1 <0 5 61 39 91 06/24/98 -573 797 2,900 <50 <50 51 200 26 09/10/98 -759 9 83 950 4 8 11 23 42 320 12/17/98 -779 1003 330 25 0 52 4 5 31 270 03/10/99 -638 8 62 550 32 1 1 11 54 77 06/22/99 -820 1044 <50 <0 5 <05 <0 5 <0 5 <20 09/13/99 -891 11 15 87 077 <05 091 26 49 12/16/99 -892 11 16 <100 <1 0 <1 0 <1 0 22 502 03/01/00 -463 6 87 90 7 <0 5 <0 5 218 85 15 06/13/00 -627 851 70 8' <0 500 <0 500 140 2 94 <5 00 09/13/00 -822 1046 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 12/14/00 -785 1009 60 64 <0 500 <0 500 <0 500 <1 50 217 03/02/01 (S) -616 840 <50 <0 50 <0 50 <0 50 <0 50 970/1,300' 03102101' (K) -616 840 <200 <20 <20 <20 <2 0 970 05/10/01 -573 797 <250 <2 5 <2 5 <2 5 <25 2,100 08/21/01 -854 1078 <250 <2 5 <25 <2 5 <25 1,700 12/05/01 814 1038 120 <0 5 <05 <0 5 05 170 03/11/02 -594 818 96 <0 5 <0 5 0 6 0 6 2,200 06/07/02 -683 907 160 <1 <1 1 1 1,700 09/24/02 -893 11 17 94 <1 <1 <1 <1 2,500 12/17/02 -803 1027 130 <1 <1 <1 <1 3,300 MW-2 03/22/89 3 41 -1413 1754 9,000 750 20 480 730 -- 06/12/89 -1478 1819 ND 1,200 80 710 870 06/12/89 (D) -- -- 11,000 1,400 90 790 1,100 09/07/89 -1625 19 66 14,000 3,200 ND 1,200 800 -- 12118/89 -1544 1885 10,000 2,500 ND 1,300 340 03/20/90 -1508 1849 13,000 4,800 88 2,100 1,500 07/03/90 -1566 1907 21,000 5,700 600 1,900 1,700 - 07/03/90 (D) -- -- 14,000 5,000 400 2,000 920 - 10/19/90 -2006 2006 11,000 4,400 77 190 340 - 01/17/91 -20 31 2031 16,000 5,400 68 1,600 280 - 03/19191 -- -- 8,700 4,300 50 1,500 260 2 Chevron1942751QMA19 4275 NF