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Tab 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 E Well Ground Depth Total Head Water To SPH SPH SPH Notes T1P'H TPH- Benzene Toluene Ethyl- Xylenes MTBE TOG EPA EPA Elev. Mev. Nater Thfc mesa Removed Removes! Diesel Gasoline Benzene (EPA 8020) 8270 8010 MW-4 05/24/96 1789 882 907 -- -- -- <50 <50 <0 5 1 8 <0 5 <0 5 91 -- - - 08/20/96 1789 797 992 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 120 -- -- - 11/05/96 1789 847 942 <50 <50 <0 5 <0 5 <0 5 <0 5 33 01/07/97 1789 1005 784 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 32 02/07/97 1789 1006 783 -- -- <50 <50 <0 5 <0 5 <05 <05 58 05/21/97 1789 835 954 -- -- -- -- <50 <50 <0 5 <0 5 <0 5 <0 5 140 08/27/97 1789 833 956 -- -- -- -- 110** <50 <0 5 <0 5 <0 5 <0 5 45 - - 11/24/97 1789 861 928 -- -- -- 150** <50 <0 5 <0 5 <0 5 <0 5 21 - - - 02/12/98 1789 11 19 670 -- -- -- -- 50** <100 <1 0 45 <1 0 12 190 -- 06/09/98 1789 351 1438 -- -- -- -- 79** <50 <0 5 <05 <0 5 <0 5 570 - 08/10/98 1799 846 943 -- -- -- <50 150 33 1 7 <0 5 2 1 1100 - 11/24/98 1789 838 951 -- -- -- -- 100** <50 <0 5 <0 5 <0 5 <0 5 650 - - - 03/05/99 1789 914 875 -- -- -- -- 84 7** 549 <0 5 <0 5 <0 5 <0 5 622 - -- 06/01/99 1789 842 955 010 005 005 -- -- -- -- -- -- -- -- 08/30199 1772+ 826 948 003 005 010 -- -- -- -- -- -- -- -- 11/23/99 1772 846 926 -- -- 010 -- 45,300** 105,000 590 17,500 3290 19,700 9170 - 02/02/00 1772 880 892 -- -- 010 -- 160000** 114,000 735 15,500 2920 17,500 11800 - 05/18/00 1772 868 904 000 -- -- 9802 35,000' 140 3,400 1,200 8,000 3,100 - -- - 08/11/00 17.72 804 968 000 -- -- 13,0002 49,000' 170 3,000 1,500 8,300 6,100 -- -- -- **Chromatogram pattern indicated an unidentified hydrocarbon +Elevation altered due to casing repairs 9-8264 x1s/4386854 4 As of 08/11/00