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. Tab1 Groundwater Monitoring Da and Analytical Results Chevron Service Station#9-8264 3775 Tracy Boulevard Vertical Measurements are in feet Tracy,California Analytical results are in parts per billion(ppb) Well Grmmd Depth Total DATE Head Water To SPS SPH SPH 111otft TPP TPI- Benzene Toluene Ethyl- Xylenes MTBE TOG EPA EPA Elev. Elev. Nater Thtekness Removed Removed Diesel G9sollne Benzene (EPA 8020) 8270 8010 MW-3 05/24/96 1788 863 925 -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 140 -- -- -- 08/20/96 1788 797 991 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 190 -- -- 11/05l96 1788 8 13 975 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 250 01/07/97 1788 926 862 -- -- <50 <200 <2 0 <2 0 <2 0 <2 0 780 -- -- 02/07/97 1788 947 841 -- -- -- -- <50 <50 <0 5 <05 <0 5 <0 5 190 - - 05/21/97 1788 8 09 979 -- -- <50 <50 <0 5 <05 <0 5 <0 5 57 - 08/27/97 1788 8 16 972 -- -- <50 <50 <0 5 <05 <0 5 <0 5 100 -- 11/24/97 1788 833 955 -- -- -- 130** <50 <0 5 <0 5 <0 5 <0 5 240 - 02/12/98 17 88 973 8 15 -- -- -- <50 <100 <1 0 <1 0 <1 0 <1 0 250 - - 06/09/98 1788 5 13 1275 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 90 -- 08/10/98 1788 8 27 9 61 -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 77 -- 11/24/98 1788 816 972 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 1000 - 03/05/99 1788 889 900 -- -- -- 631 <500 <5 0 <5 0 <5 0 <5 0 2840 - - - 06/01/99 1788 830 9 58 -- -- -- -- 145** 612 <0 5 163 8 2 53 4 3540 - - 08/30/99 1788 8 10 978 -- -- ** <50 <125 <1 25 <1 25 <1 25 <1 25 2830 - 11/23/99 1788 8 21 9 67 -- -- -- ** 82 6** <2500 <25 <25 <25 <25 4380 -- -- 02/02/00 1788 7 87 1001 -- -- -- ** 122** <2500 <25 <25 <25 <25 9850 -05/18/00 1788 844 944 000 -- -- -- <50 <500 46 <5 0 <5 0 <5 0 4,100 - -- -- 08/11/00 17,88 785 1003 0.00 -- -- -- <50 <500 <5 0 <5 0 <5 0 <5 0 4,700 -- -- -- **Chromatogram pattern indicated an unidentified hydrocarbon 9 8264 xlsl#386854 3 As of 08/11/00