ARCHIVED REPORTS_XR0008051 CASE 1

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Table I Groundwater Elevation and Analytical Data Former BP Retail Site No 11194 2375 Tracy Blvd, Tracy, CA TOC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) WL) (ug/L) (pglL) (NAIL) (erg/L) (ug/L) WglL) (mglL) Comments MW-7 7/12/1990 -- 2650 666 1984 ND<50 ND<0 3 N0<0 3 ND<0 3 ND<0 3 8/27/1990 — 2650 686 1964 11/211990 -- 2650 703 1947 11/5/19990 — 2650 704 1946 ND<50 -- ND<0 3 ND<0 3 ND<0 3 ND<0 3 — — 2/25/1991 -- 2650 630 2020 N0<50 — ND<0 3 ND<0 3 ND<0 3 ND<0 3 — .. 6/27/1991 — 2650 714 1936 ND<50 - ND<0 5 ND<0 5 ND<0 5 ND<0 5 _ 9/25/1991 - 2650 850 1800 ND<30 - ND<0 30 ND<0 30 ND<0 30 ND<0 30 — - 12/10/1991 - 2650 698 1952 ND<30 — ND<0 30 ND<0 30 ND<0 30 ND<0 30 — — 3/25/1992 _ 2650 653 1997 ND<30 -- ND<0 30 ND<0 30 ND<0 30 ND<O 30 — -- 6/25/1992 -- 2650 813 18 37 ND<30 — ND<0 30 ND<0 30 ND<0 30 ND<0 30 -- — 12/8/1992 -- 2650 689 1961 ND<50 — ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- — 3/10/1993 — 2650 6 54 1996 ND<50 - ND<0 5 ND<0 5 ND<0 5 ND<0 5 6/16/1993 — 2650 643 2007 10/22/1993 — 2650 697 1953 1/24/1994 -- 2650 683 19 67 6/7/1994 -- 2650 729 i9 21 ND<50 - ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 0 34 9/13/1994 -- 2650 753 1897 1/10/1995 -- 2650 622 2028 3/23/1995 — 2650 616 2034 ND<50 — ND<0 50 ND<0 50 ND<0 50 ND<1 0 — 89 10/4/1995 -- 2650 731 1919 1/4/1996 -- 265O 685 1965 3/29/1996 — 2650 649 2001 ND<50 -- ND<0 5 ND<1 ND<1 ND<1 ND<10 39 7/1/1996 -- 2650 704 1946 10/15/1996 -- 2650 727 19 23 4/16/1997 — 2650 585 2065 10/15/1997 — 2650 727 1923 3/17/1998 -- 2650 659 1991 1/6/1999 -- 2650 698 1952 1/19/2000 -- 2650 680 1970 4/12/2000 -- 2650 693 1957 7/22/2000 -- 2650 699 1951 10/26/2000 - 1 265 694 1956 1,300 -- �IND<O 5 ND<0 5 ND<0 5 ND<0 5 8,600 — 1/17/2001 -- 265 — — -- Report Date Apnl 8,2005 Page 23 of 27