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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 msl) (feet bgs) (feet msl) (ug1L) (og1L) (ug1L) (pg1L) (ygfL) (srglL) (pg1L) (mg1L) Comments <br /> ATR-12 3/14/1997 NP 4708 10 11 36 97 <50 <05 <05 <0 5 <0 5 -- 009 <br /> 6/4/1997 NP 4708 934 3774 <50 — <0 5 <05 <0 5 <0 5 <2 5 012 <br /> 8/11/1997 NP 4708 967 3741 <50 -- <05 <05 <0 5 <0 5 <2 5 -- <br /> i 11171 M997 NP 4708 954 37 54 <50 <0 5 <05 <05 <0 5 <2 5 -- <br /> 3/30/1998 NP 4708 8 96 3812 <50 -- <05 <0 5 <0 5 <0 5 <50 21 <br /> 6/25/1998 NP 4708 935 3773 <50 - <05 <0 5 <0 5 <0 5 <50 32 <br /> 9/11/1998 NP 4708 947 3761 <50 -- <05 <0 5 <0 5 <0 5 <2 5 126 <br /> 12/15/1998 NP 4708 931 3777 <50 -- <0 5 <05 <0 5 <0 5 <5 0 2 8 <br /> 3/17/1999 NP 4708 916 3792 <50 <0 5 <0 5 <0 5 <05 <50 1 8 <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 - <05 <0 5 <0 5 <05 <50 3 7 <br /> 12122/1999 NP 4708 942 3766 <50 - <0 5 <05 <0 5 <05 <2 50 083 <br /> 2/29/2000 NP 4708 893 3815 <50 — <05 <05 <0 5 <05 <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 9 96 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 <25 2 <br /> 1 211 9/200 1 P 4708 928 3780 <50 — <0 50 <0 50 <0 50 <0 50 <2 0' 232 <br /> 3/14/2002 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 I <0 5 <05 <0 5" 4 5 <br /> 9/11/2002 P 4708 938 3770 <50 -- <05 <05 <0 5 <05 <0 5` 3 3 <br /> 12!1712002 P 4708 878 3830 <50 <05 <05 <0 5 <0 5 <0 5' 42 <br /> 03/31/2003 P 4708 930 3778 <50 - <050 <0 50 <0 50 <0 50 <0 50' 21 <br /> 06/09/2003 P 4708 928 3780 <50 — <050 <0 50 <0 50 <0 50 <0 50" 2 9 <br /> 09/18/2003 P 4708 950 3758 <50 — <0 50 <0 50 <0 50 <0 50 <0 50" 25 <br /> 12/24/2003 P 4708 930 3778 <50 <050 <0 50 <0 50 <0 50 <0 50' 2 0 <br /> 03/12/2004 P 1888 918 970 <50 <0 5o <0 50 <0 50 <0 50 <0 50* 17 <br /> 0610112004 -- 1888 939 1 949 1 — — -- — — -- — Not Sampled <br /> QTCB 3/14/2002 -- — — - <56 -- <0 50 <0 50 <0 50 <0 50 - -- <br /> SMW-1 10/7/1994 — 5024 1286 3738 2,200 — 250 110 <0 5 360 — — <br /> Report Date July 15,2004 Page 23 of 26 <br />