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• i i <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet ms]) (feet bgs) (feet msl) WL) (ug1L) (pg1L) (pg1L) (Erg/L) (pg1L) (pg1L) (mg1L) Comments <br /> ATR-12 6/4/1997 NP 4708 934 3774 <50 — <05 <0 5 <0 5 <0 5 <2 5 012 <br /> 8111/1997 NP 4708 967 3741 <50 -- <05 <0 5 <05 <0 5 <25 - <br /> 11/17/1997 NP 4708 954 3754 <50 -- <05 <0 5 <05 <0 5 <25 — <br /> 313011998 NP 4708 8 96 3812 <50 -- <05 <0 5 <05 <0 5 <50 21 <br /> 6/25/1998 NP 4708 935 3773 <50 -- <0 5 <0 5 <0 5 <0 5 <50 32 <br /> 9/11/1998 NP 4708 947 3761 <50 — <05 <0 5 <05 <0 5 <25 126 <br /> 12/15/1998 NP 4708 931 3777 <50 -- <0 5 <0 5 <05 <0 5 <50 28 <br /> 3/17/1999 NP 4708 916 3792 <50 — <05 <0 5 <05 <05 <50 18 <br /> 5/14/1999 NP 4708 933 3775 <50 -- <0 5 <0 5 <0 5 <0 5 <50 2 <br /> 9/16/1999 NP 4708 955 3753 <50 — <0 5 <0 5 <0 5 <0 5 <50 37 <br /> 12/22/1999 NP 4708 942 3766 <50 — <05 <0 5 <0 5 <0 5 <2 50 083 <br /> 2/29/2000 NP 4708 893 3815 <50 -- <05 <0 5 <05 <0 5 <2 50 57 <br /> 6/7/2000 — 4708 -- — — — — — -- -- — -- Well inaccessible <br /> 9/25/2000 -- 4708 -- -- -- — -- -- - — — — Well inaccessible <br /> 12/21/2000 -- 4708 — -- -- — — — — — -- -- Well inaccessible <br /> 3/27/2001 P 4708 926 3782 <50 0 -- <0 500 <0 500 <0 500 <0 500 <2 00* 23 <br /> 6/20/2001 P 4708 996 3712 <50 -- <0 50 <0 50 <0 50 <0 50 <2 0* — <br /> 9/12/2001 P 4708 938 3770 <50 — <0 50 <0 50 <0 50 <0 50 <2 5 2 <br /> 12/19/2001 P 4708 928 3780 <50 -- <0 50 <0 50 <0 50 <0 50 <2 0* 232 <br /> 3114/2002 P 4708 929 3779 <50 — <0 50 <0 50 <0 50 <0 50 <0 50 184 <br /> 6/28/2002 P 4708 943 3765 <50 -- <05 <05 <0 5 <0 5 <0 5* 4 5 <br /> 9/11/2002 P 4708 938 3770 <50 — <0 5 <05 <0 5 <0 5 <0 5* 33 <br /> 12/17/2002 P 4708 878 3830 <50 — <0 5 <0 5 <0 5 <0 5 <0 5* 42 <br /> 03/31/2003 P 4708 930 3778 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 21 <br /> 06/09/2003 P 4708 928 3780 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* 29 <br /> 09/18/2003 P 4708 950 3758 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 2 5 <br /> 12/24/2003 P 4708 930 3778 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* 2 0 <br /> 03/12/2004 P 1 1888 91 8 9 70 <50 1 -- <0 50 <0 50 1 <0 50 <0 50 <0 50* 1 7 <br /> 06/01/2004 1888 939 949 — — — — -- -- -- -- Not Sampled <br /> 09/20/2004 -- 1888 949 939 - — — — — -- — — Not Sampled <br /> 12/13/2004 — 1888 939 949 — -- -- — -- -- — — Not Sampled <br /> 03/0212005 P 1888 910 978 <50 -- <0 s0 <0 50 <0 50 <0 50 <0 SO* 20 <br /> QTCB 1311412002 -- - -- — <50 — <0 50 <0 50 <0 50 <0 50 - - <br /> Report Date March 21,2005 Page 24 of 27 <br />