ARCHIVED REPORTS_XR0008043 CASE 1

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Table 2 Fuel Oxygenates Analytical Data . Former BP Retail Site No 11194 2375 Tracy Blvd, Tracy, CA Well Date Ethanol TBA MtBE DIPE EtBE TAME Number Sampled (pg/L) (P9/L) (pg1L) (ug/L) (pg/L) (pg/L) Comments MW-1 01/26/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 04/27/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 07/30/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 MW-2 4/12/2000 -- -- 9,800 ND<250 ND<250 ND<250 7/22/2000 -- 25,000 120,000 ND<25 ND<25 ND<25 10/26/2000 -- 4,300 3,300 ND<100 ND<100 ND<100 1/17/2001 -- 17,000 29,000 ND<10 ND<10 ND<10 4/12/2001 - 1,100 700 ND<1 0 ND<1 0 ND 7/30/2002 -- -- 58 fi — - -- 10/31/2002 — -- 13 -- — — 01/30/2003 -- -- 79 -- _ — 04/30/2003 -- -- 290 -- -- — 07/30/2003 <500 <100 65 <5 0 <5 0 <5 0 10/29/2003 <100 <20 055 <1 0 <1 0 <1 0 01/26/2004 <100 95 91 <10 <10 <10 04/28/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 07!30!20041 <100 <20 1 <0 50 '050 <0 50 '050 MW-3 4/12/2000 -- -- 28 ND<10 ND<10 ND<10 7/22/2000 -- ND<50 15 ND<5 0 ND<5 0 ND<5 0 10/26/2000 — 11 67 ND<I0 ND<10 ND<10 1/17/2001 ND<10 77 ND<l0 ND<10 ND<10 4/12/2001 11 99 ND<10 ND<10 ND<10 7/30/2002 - -- 1,280 - - - 10/31/2002 -- -- 88 — —01/3012003 -- -- 15 -- -- -- 04/30/2003 -- -- 99 — -- — 07/30/2003 <100 210 29 <1 0 <1 0 <1 0 10/29/2003 <100 300 51 <10 <10 <10 01/26/2004 <100 450 15 <10 <16 <10 04/27/2004 <100 480 27 <1 0 <1 0 <1 0 07/30/2004 <100 UJ 390 19 <0 50 <0 50 <0 50 MW-4 4/12/2000 -- -- 58 N13<10 ND<10 ND<10 7/22/2000 -- ND<100 61 ND<10 ND<10 ND<10 10/26/2000 -- 18 82 N0<10 ND<10 ND<10 1/17/2001 -- 70 100 ND<10 ND<10 ND<10 4/12/2001 -- 130 440 ND<10 ND<10 12 7/30/2002 -- -- 395 — — -- 10/31/2002 -- -- 10 -- -- -- 01/30/2003 -- — 32 — -- -- 04/30/2003 — -- 41 -- -- -- 07/30/2003 <250 <50 49 <2 5 <2 5 <2 5 10/29/2003 <200 <40 79 J <2 0 <2 0 <2 0 01/26/2004 <1,000 230 16 <10 <10 <10 04/28/2004 <100 <20 84 <1 0 <1 0 <1 0 07/30/2004 <100 <20 31 <0 50 <0 50 <0 50 MW-5 01/30/2003 = — 38 T 04/30/2003 17 Report Date September 10, 2004 Page 2 of 4