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TableT Pag,4pf 18 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,Califomia Floating Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPNg Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) In feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) ATR-11 03/17/99 P 896 -- 3788 023 <50 <0 5 0 821 <0 5 <0 5 <5 0 37 (cont) 05/14/99 920 3887 099 - - - - - 280 09/16/99 P 952 3855 -032 <50 <0 5 <0 5 <0 5 <0 5 <50 34 12/22/99 932 -- 3752 -103 -- -- - - -- 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 -076 - -- - -- 09/25/00 NP 1021 -- 3663 -086 <50 <0 5 <0 5 <0 5 <0 5 893 05 12/21/00 915 3769 106 -- -- - - -- -- 45 03/27/01 P 908 3778 009 <50 0 <0 500 <0 500 <0 500 <0 500 <2 00* 37 ATR 12 10/16/90 4708 -- -- - <50 <0 5 <0 5 <0 5 <0 5 -- -- 10/19/90 933 - 3776 -- -- -- -- -- 01/10/91 916 3792 017 <60 <0 5 <0 5 <0 5 <0 5 - 04/10/91 898 -- 3810 018 <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 3766 -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 -- -- -- - - 04121/92 -- - -- -- <50 <0 5 <0 5 <0 5 <0 5 07/08/92 921 - 3787 -- <60 <0 5 <0 5 <0 5 <0 5 10/07/92 932 -- 3776 -011 <50 <0 5 <0 5 <0 5 <0 5 01/18/93 832 -- 3876 100 <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 - - - 02t28/95 . 04/25/95 -- -- -- - - 04/26/95 -- -- - - 07/27/95 -- -- -- - 10/26/95 -- - -- -- - - 02/12/96 885 -- 3823 -- <50 <0 5 <0 6 <0 5 <0 6