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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard,Tracy,California • Well Date TBA MtBE DIPE EtBE TAME Ethanol Number Sampled (Ng/L) (pg/L) (pg/L) Wg/L) Wg/L.) WL) ATR-5 12/29/2000 <200 <2 00 3/27/2001 <200 180 6/20/2001 -- 220 9/12/2001 <200 -- -- __ 12/19/2001 Well inaccessible _ 3/14/2002 Well inaccessible 6/28/2002 <5 0 83 <0 50 <0 50 <0 50 9/11/2002 <20 19 <0 50 <0 50 <0 50 - 12/17/2002 -- -- __ 3/31/2003 <20 11 <0 50 <0 50 <0 50 <100 6/9/2003 <20 31 <10 <10 <10 <100 9/18/2003 <100 59 <5 0 <5 0 <5 0 <500 ATR-6 3/27/2001 <200 521 -- __ __ 6/20/2001 -- -- 9112!2001 <200 12/19/2001 -- -- 3/14/2002 <50 18 6/28/2002 -- -- __ 9/11/2002 <20 068 <0 50 <0 50 <0 50 12!17/2002 -- -- __ 3/31/2003 <20 12 <0 50 <0 50 <0 50 <100 6/9/2003 Not Sampled 9/18/2003 <20 11 <10 <10 <10 <100 ATR-7 12/29/2000 <200 175 -- -- __ 3/27/2001 <200 305 6/20/2001 -- 580 - - - - 9/12/2001 <200 -- 12119/2001 -12119/2001 <20 72 3/14/2002 <5 0 14 -- __ _ 6/26/2002 <5 0 097 <0 50 <0 50 <0 50 -- 9/11/2002 <20 1 1 <0 50 <0 50 <0 50 — 12/17/2002 <5 0 <0 50 <0 50 <0 50 <0 50 -- 3/31/2003 <20 <0 50 <0 50 <0 50 <0 50 <100 6/9/2003 <20 <0 5 <1 0 <1 0 <1 0 <100 9/16/2003 <20 <0 5 <1 0 <1 0 <1 0 <100 ATR-8 12/29/2000 <200 <2 00 __ __ -- 3/27/2001 <200 <2 00 6/20/2001 -- <2 0 -- -- 9/12/2001 <200 -- 12J1 9/2001 -12/19/2001 <20 21 3/14/2002 <50 <0 50 -- -- __ _ 6/28/2002 <5 0 082 <0 50 <0 50 <0 50 9/11/2002 <20 073 <0 50 <0 50 <0 50 12/17/2002 <50 17 <0 50 <0 50 <0 50 -- a/31/2003 - 3131/2003 <20 1 1 <0 50 <0 50 <0 50 <100 6/9/2003 <20 <0 5 <1 0 <1 0 <1 0 <100 9/18/2003 <20 23 <1 0 <1 0 <10 <100 K MprocessU5 BP ARC05020935Quarter15A3 QTR 0352093 GWMR 3x03 Page 2 of 4