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Tat Pao of 18 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Sennoe Station#2093 <br /> 3425 Tracy Blvd,Tracy,California <br /> Floating <br /> Well Depth product Groundwater Groundwater Total <br /> Date Elevation to Water thickness Elevation Elevation Change TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO <br /> Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg") <br /> 03/30/98 NP 866 - 38 18 081 <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 5 <br /> 06/25/98 992 -- 3692 -126 -- -- -- -- -- -- -- <br /> 09/11/98 P 940 - 3744 052 <50 <0 5 <0 5 <0 5 <0 5 <2 5 161 <br /> ATR-11 12/15/98 919 - 3765 021 -- -- -- -- 1 1 <br /> (cant) 03/17/99 P 8 96 - 3788 023 <50 <0 5 0 821 <0 5 <0 5 <5 0 3 7 <br /> 05/14/99 920 -- 3887 099 -- - -- - - 2 80 <br /> 09/16/99 P 952 — 3855 -032 <50 <0 5 <05 <0 5 <0 5 <5 0 34 <br /> 12/22199 932 -- 3875 020 -- -- - -- -- 044 <br /> 02/29/00 P 860 -- 3947 072 114 <0 5 0 678 <0 5 163 <2 5 3 2 <br /> 06/07/00 NP 9 35 -- 3872 -075 -- - -- - — - - <br /> 09/25/00 NP 10 211 -- 3663 -209 <50 <0 5 <0 5 <0 5 <0 5 893 0 5 <br /> ATR-12 10/16/90 4708 -- -- -- -- <50 <0 5 <0 5 <0 5 <0 5 -- <br /> 10/19/90 933 -- 3775 -- - -- -- -- -- <br /> 01/10/91 916 - 3792 017 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 04/10/91 898 3810 018 <50 <0 5 <0 5 <0 5 <0 5 - <br /> 07/12/91 928 -- 3780 -030 <50 <0 5 <0 5 <0 5 <0 5 <br /> 09/24/91 952 -- 3756 -024 -- -- -- <br /> 09/25/91 -- -- -- -- <50 <0 5 <0 5 <0 5 <0 5 - <br /> 01/23/92 906 -- 3802 -- <50 <0 5 <0 5 <0 5 <0 5 <br /> 04/20/92 900 -- 3808 006 -- -- -- -- -- <br /> 04/21/92 -- -- — -- <50 <0 5 <0 5 <0 5 <0 5 <br /> 07/08/92 921 -- 3787 -- <50 <0 5 <0 5 <0 5 <0 5 - <br /> 10/07/92 932 3776 -011 <50 <0 5 <0 5 <0 5 <0 5 <br /> 01/18/93 832 -- 3876 100 <50 <0 5 <0 5 <0 5 <0 5 <br /> 04/1"3 879 -- 3829 -047 <50 <0 5 <0 5 <0 5 <0 5 <br /> 08131/93 939 3769 -060 <50 <0 5 <0 5 <0 5 <0 5 <br /> 10/27/93 936 -- 3772 003 <50 <0 5 <0 5 <0 5 <0 5 <br /> 02/18/94 902 3806 034 <10 04 0 5 <0 3 <0 5 <br /> 05/20/94 906 - 3802 -004 <10 <0 3 <0 3 <0 3 <0 5 <br /> 10/07/94 -- -- -- -- -- <br /> 12/16/94 - - - - <br /> 02/28/95 .. .. ._ _. <br /> 04/25/95 - - - <br /> 04/26/95 -- -. - <br /> 07/27/95 -- - - <br />