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! 0 0 Cumulative Table of Well Data and Analytical Results Vertical Measurements are in feet _V_olumetric Measurements are in gallons _ Analytical results are in parts per billion(ppb) Ground o a - — DATE Head Water To SPH SPH SPH Notes TPH- Benzene Toluene Ethyl- Xylene MTBE TPH- TOG EPA EPA Other Bev Elev Water Thickness Removed Removed Gasoline Benzene (EPA 8020) Diesel 8270 8010 MW-1 - - 05/24/96 1941 901 1040 - - - <50 <0 5 <0 5 <0 5 <0 5 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 ' 08/20/96 1941 803 1138 -- — <50 <0 5 <0 5 <0 5 <05 <2 5 <50 12,400 <5 0-<10 <0 5-<1 0 11105/96 1941 8513 1085 — - - <50 <0 5 <0 5 <0 5 <05 <2 5 <50 <5000 <5 0-<10 <0 5-<1 0 " 01/07/97 1941 1025 916 — — — <50 <0 5 <0 5 <0 5 <05 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 02/07/97 1941 1043 898 — — — -- <50 <05 <0 5 <0 5 <05 <2 5 <50 <5000 * <0 5-<5 0 05/21/97 1941 846 1095 - — -- <50 <05 <0 5 <05 <05 <2 5 <50 <5000 * <0 5-<5 0 08127/97 1941 845 1096 - -- - <50 <05 <0 5 <05 <0 5 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 11/24/97 1941 873 1068 -- <50 <05 <05 <05 <0 5 <2 5 110** <5000 <5 0-<10 <0 5-<5 0 02/12/98 1941 1047 894 -- -- - <50 <0 5 <05 <0 5 <0 5 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 ' 06/09/98 1941 258 18 83 -- - -- <50 <0 5 <05 <0 5 <0 5 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 -- 08/10/98 1941 846 1095 - -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 11124/98 1941 841 1100 — - - <50 <0 5 <0 5 <0 5 <0 5 <25 60** 37 000 <5 0-<10 <0 5-<5 0 " 03/05/99 1941 919 1022 - -- *** <50 <0 5 <0 5 <0 5 <0 5 <2 0 <50 <5000 <10-<50 <0 5-<5 0 06/01199 1941 865 1076 - — -- <50 <0 5 <0 5 <0 5 <05 <50 <50 <5000 <10-<50 <0 5-<5 0 08130199 1941 829 11 12 -- - -- - <60 <0 5 <0 5 <0 5 <05 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 11/23/99 1941 8 54 1087 -- - — -- <50 <0 5 <0 5 <0 5 <05 <2 5 <50 <5000 <5 0-<10 <0 5-<5 0 " MW-2 05/24/96 1898 907 9 91 — -- - <50 <0 5 <0 5 <0 5 <05 <2 5 <50 — -- -- 08/20/96 1898 798 1100 - -- - <50 <0 5 <0 5 <0 5 <05 <2 5 <50 — 11/05/96 1898 829 1069 -- -- -- <50 <05 <0 5 <05 <05 <2 5 <50 - -- - 01/07/97 1898 10 13 885 — — -- <50 <05 <0 5 <05 <05 <2 5 <50 - -- -- -- 02/07/97 1898 1025 873 — <50 <05 <05 <05 <05 <2 5 <50 -- 05/21/97 1698 625 1073 -- - - -- <50 <05 <05 <05 <0 5 <2 5 <50 -- -- 08127/97 1898 867 1031 -- __ <50 <05 <05 <0 5 <0 5 <2 5 <50 — 11124/97 1898 851 1047 - - -- <50 <0 5 <05 <0 5 <0 5 2 9 81** -- - _ 02/12/98 18 98 1165 743 — - - <50 <0 5 <05 <0 5 <0 5 <2 5 <50 06109/98 1898 459 1439 -- — -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 <50 - 08/10/98 1898 820 1078 -- - <50 <0 5 <0 5 <0 5 <0 5 <2 5 <50 — -- 11124/98 1898 828 1070 -- - - <50 <0 5 <0 5 <0 5 <0 5 3 9 <50 - -- -- 03/05/99 1898 924 974 — -- - <50 <0 5 <0 5 <0 5 <0 5 <2 0 <50 06/01/99 1898 852 1046 -- - -- <50 <0 5 <0 5 <0 5 <0 5 <2 0 75 3*" - -- -- -- 08/30/99 1898 8111 1087 -- - - <50 <0 5 <0 5 <0 5 <0 5 <6 2 <50 - -- 11/23/99 1898 843 1055 -- -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 <50 - -- -- "See Additional Analyses Table 1 *'Chromatogram pattern Indicated an unidentified hydrocarbon *"Insufficient preservative to reduce the sample pH to less than 2 Sample was analyzed within 14 days of sampling,but beyond the 7 days recommended for Benzene,Toluene,and Ethylbenzene Blaine Tech Services Inc 991123 A-3 4th-0 1999 Monitoring at Chevron 9-8264 3775 Tracy Blvd Tracy CA 1