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s • 0 Page 17 of 20 Table 1 y Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPH9 Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft,MSL) Change(ft) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) 5114/99 920 3887 099 - - -- -- -- -- 280 ATR-11 9116199 P 962 3855 -032 <50 <0 5 <0 5 <0 5 <0 5 <5 0 34 (cont) 12/22/99 932 3762 -103 - -- 044 2129100 P 8 60 3824 072 114 <0 5 0 678 <0 5 163 <2 5 32 617100 NP 935 3749 -076 -- -- -- 9/25100 NP 1021 36 63 -0 86 -- <60 <0 5 <0 5 <0 5 <0 5 893 0 5 12/21/00 9115 3769 106 -- .. _- .. 45 3127/01 P 906 3778 009 <50 0 <0 500 <0 500 <0 500 <0 500 <2 00* 3 7 6/20101 925 3759 -019 -- 9/12/01 P 1031 3663 -106 <60 <0 50 <0 50 <0 50 <0 50 <2 5 16 12!19101 914 3770 1.17 -- .- .. ATR-12 10/16/90 4708 -- -- -- -- <50 <0 5 <0 5 <0 5 <0 5 _ 10/19/90 933 3776 -- -- 1/10/91 916 3792 0 17 -- <50 <0 5 <0 5 <0 5 <0 5 4/1 Ml 898 3810 018 <50 <0 5 <0 5 <0 5 <0 5 - 7/12/91 928 3780 -030 <50 <0 5 <0 5 <0 5 <0 5 -- 9/24191 952 3756 -024 - -- -- __ - 9//25/91 -- -- -- <50 <0 5 <0 5 <0 5 <0 5 - 1/23/92 906 3802 -- <50 <0 5 <0 5 <0 6 <0 5 -- 4120/92 900 3808 006 -- ._ -_ 4121/92 — -- -- - <50 <0 5 <0 5 <0 5 <0 5 -- - 7/8/92 921 3787 - <50 <0 5 <0 5 <0 5 <0 5 -- 10/7192 932 3776 Oil <50 <0 5 <0 5 <0 5 <0 5 -- 1/18/93 832 3876 100 <50 <0 5 <0 5 <0 5 <0 5 -- 4/14/93 879 38 29 -047 -- <50 <0 5 <0 5 <0 5 <0 5 .. 8/31/93 939 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 - 2/18/94 902 3806 034 -- <10 04 0 5 <0 3 <0 5 -- 5/20/94 906 3802 004 -- <10 <0 3 <0 3 <0 3 <0 5 -- 10/7/94 - -- -- -- - -- -- - - 12/16/94 -- -- _- -- -- -- -- 2/28/95 4125195 -- -- -- -- -- -- - -- -- 4/26/95 7/27/95 -- -- - -- -- -- -- _. ProjeeWARCO/20931Reportsrfablestgwtables2093 xls