ARCHIVED REPORTS_XR0008048 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 P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) Lug/L) (pg1L) (pg/L) (/ag1L) (pg/L) (pg/L) (pglL) (mg1L) Comments MW-5 2/25/1991 2545 429 2116 2 400 -- 160 59 120 96 6/27/1991 - 2545 534 20 11 ND<50 67 ND<0 5 ND<0 5 ND<0 5 — 9/25/1991 -- 2545 574 1971 1,800 — 120 39 79 94 -- — 12/10/1991 -- 2545 510 2035 720 - 46 34 38 58 3/25/1992 -- 2545 432 2113 550 -- 75 033 4 32 6/25/1992 - 2545 -- — 12/8/1992 -- 2545 '1162 1383 3/10/1993 - 25 45 12 11 13 34 -WD-Z5--0 — ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- — 6/16/1993 - 2545 10 13 1532 73 -- 22 21 3 9 5 7 -- _ 10/22/1993 — 25 45 4 99 20 46 ND<50 ND<0 5 ND<0 5 ND<0 5 IJD<0 5 ND<5 0 -- 1!2411994 -- 2545 891 1654 120 110 6 2 6 26 ND<5 0 — 6/7/1994 - 2545 6 38 19 07 ND<50 — ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 0 -- 9/13/1994 -— 2545 5 99 19 46 ND<50 - ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 0 1/10/1995 -- 2545 435 21 10 ND<50 -- ND<0 5 ND<0 5 ND<0 5 ND<l .. 3123/1995 -- -- -- — 620 -- 20 2 5 55 53 -- -- QC-1 3/23/1995 -- 25 45 4 19 21 26 910 -- 23 3 68 65 — 79 10/4/1995 — 2545 541 20 04 ND<50 -- 2 2 ND<0 50 0 69 ND<1 0 7 8 69 1/4/1996 -- 25 45 4 62 20 83 130 -- 4 6 1 1 4 5 3 7 $7 26 3/29/1996 — 2545 445 2100 490 — 27 ND<1 20 12 13 27 7/1/1996 -- 2545 501 2044 580 -- 35 5 30 13 11 —i-7- 10/1511996 10115!1996 — 2545 523 2022 380 -- 39 1 2 86 12 4 34 5 5 4116!1997 — —2545 390 21 55 10/15/1997 -- 2545 508 2037 3/17/1998 — 2545 470 2075 1/6/1999 -- 2545 4 91 2054 -T/19/2000 - 2545 465 —2086---- 4/12/2000 080 -4/12/2000 -- 2545 560 1985 7/22/2000 2545 499 2046 10/26/2000 -- 2545 457 2088 1/17/2001 -- 2545 515 2030 4/12/2001 -- 2545 4 83 2062 — — 5/23/2001 — 2545 4 85 2060 120 -- 0 653 ND<0 5 ND<0 5 ND<1 5 7/31/2001 — 2545 512 2033 340 121 ND<0 5 0 527 ND<1 5 463 Report Date October 93,2005 Page 20 of 28