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Table 1 Page 16 of 18 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,California I Floating Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) {mVI) ATR-11 12/15/98 9 19 3765 021 -- -- -- -- -- -- 1 1 (cont) 03/17/99 P 896 3788 023 <50 <0 5 0 821 <0 5 <0 5 <5 0 37 05/14/99 920 3887 099 - - -- -- -- - 280 09/16/99 P 952 3855 032 <50 <0 5 <0 5 <0 5 <0 5 <5 0 34 12/22/99 9 32 3752 -1 03 -- -- - - 044 02/29/00 P 860 3824 072 114 <0 5 0 678 <0 5 1 63 <2 5 32 06/07/00 NP 935 3749 -075 -- -- -- - -- -- - 09/25/00 NP 1021 3663 -086 <50 <0 5 <0 5 <0 5 <0 5 893 05 12121/00 916 -- 3769 1 06 -- -- -- - 45 ATR 12 10/16/90 4708 - <50 <0 5 <0 5 <0 5 <0 5 10/19/90 933 3775 - - -- -- 01/10/91 9 16 3792 017 <50 <0 5 <0 5 <0 5 <0 5 04/10/91 898 38 10 0 18 <50 <0 5 <0 5 <0 5 <0 5 07/12/91 928 3780 030 <50 <0 5 <0 5 <0 5 <0 5 09/24/91 952 3756 024 -- -- -- -- 09/25/91 - -- -- <50 <0 5 <0 5 <0 5 <0 5 01/23/92 906 3802 -- <50 <0 5 <0 5 <0 5 <0 5 04/20/92 900 3808 006 -- -- -- -- -- 04/21/92 - - <50 <0 5 <0 5 <0 5 <0 5 07/08/92 921 3787 - <50 <0 5 <0 5 <0 5 <0 5 10/07/92 932 3776 -0 11 <50 <0 5 <0 5 <0 5 <0 5 01/18/93 832 3876 1 00 <50 <0 5 <0 5 <0 5 <0 5 04/14/93 879 3829 047 <50 <0 5 <0 5 <0 5 <0 5 08/31/93 939 3769 060 <50 <0 5 <0 5 <0 5 <0 5 10/27/93 936 3772 003 <50 <0 5 <0 5 <0 5 <0 5 02/18/94 902 3806 034 <10 04 05 <0 3 <0 5 05/20/94 906 3802 004 <10 <0 3 <0 3 <0 3 <0 5 10/07/94 -- -- 12/16/94 02/28/95 -- -. 04/25/95 .- 04126l95 .- 07l27/95 -- 10/26/95 -- - -- .. -- 02112/96 8 85 3823 -- <50 <0 5 <0 5 <0 5 <0 5 04/18/96 922 3786 -037 <50 <0 5 <0 5 <0 5 <0 5 -- 07/18/96 953 3755 -031 <50 <0 5 <0 5 <0 5 <0 5 <5 --