ARCHIVED REPORTS_XR0008047 CASE 1

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Table 1 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) WWI-) (P91L) (frg/L) 4191L) MIL) (pg/L) 4,WL) (mg/L) Comments MW 4 6!7/1988 2590 525 2065 - - -- -- 10/18/1988 2590 555 2035 1,100 75 28 13 35 2/15/1990 - 2590 490 2100 1,800 370 43 130 98 - - 4/26/1990 2590 505 2085 - -- - - - 7/12/1990 2590 516 2074 3,100 510 41 220 320 8/27/1990 2590 546 2044 -- - - -- - 11/2/1990 2590 551 2039 - - - -- -- -- 11/5/1990 2590 553 2037 950 330 18 52 29 2/25/1991 2590 473 21 17 370 120 33 22 13 6/27/1991 2590 564 2026 1,500 - 130 ND<0 5 21 18 - -- 9/25/1991 2590 660 1930 810 70 49 12 110 -- 12/10/1991 2590 543 2047 1,300 - 100 14 62 110 3/25/1992 2590 489 2101 1,400 500 40 210 320 6/25/1992 2590 711 1910 - - 0 40 ft free product present,[a] 12/8/1992 2590 539 2051 -- Sheen 3/10/1993 2590 495 2095 -- Sheen 6/16/1993 2590 547 2043 Sheen 10/22/1993 2590 5 50 2040 - - - Sheen 1/24/1994 2590 5 54 2036 6,900 88 16 130 340 582 -- 6nI1994 2590 598 1992 23,000 210 30 720 1,200 138 3 2 9/13/1994 - -- 5,600 21 13 220 500 - -- QC-1 9/13/1994 2590 483 2107 5,100 - 86 1 280 510 -- 62 9/13/1994 2590 642 1948 9,000 20 15 240 550 68 7 1/10/1995 - - - 2,300 74 1 220 380 - - QC-1 3/23/1995 2590 472 2125 -- - -- - -- 0 09 fl free product present,[a] 10/4/1995 - 2590 594 2007 - - - - - -- 0 14 ft free product present,[a) 1/4/1996 2590 512 2078 1,700 27 2 5 36 58 25 0 8 3/29/1996 2590 497 2093 1,300 76 ND<1 36 32 ND<10 24 7/1/1996 2590 557 2033 11,000 160 49 590 836 ND<100 4 10/15/1996 -- -- 1,100 22 ND<5 0 75 85 ND<50 47 QC-1 10/15/1996 2590 1 577 2013 2,100 39 ND<10 160 190 1 ND<100 1 47 Report Date December f,2005 Page 18 of 29