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TABLE 2 Groundwater Analytical Results for Oxygenates ARCO Service Station No 2186 3212 North Cahfomia Street,Stockton,California Well Sample TBA MtBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Number Date VW-IB 6/19/2092 <5 0 320 <0 50 <0 50 l 5 16 — -- (Coot) 9/12/2002 <100 590 <10 <10 <10 33 <10 <800 VW-213 3/16/2001 <200 573 <2 0 <2 0 <2 0 -- .. ._ 6/21/2001 <500* 780 Q0* <10* <10* 9/13/2001 <1400 2,400 <29 <29 <29 12/11/2001 34 450 <2 0 <2 0 25 3/14/2002 20 320 <0 50 <0 50 25 -- 6/19/2002 <100 370 <10 <10 <10 <10 -- -- 9/12/2002 25 210 <2.5 <2 5 <2 5 79 <2 5 <200 VW-3B 11/20/1997 <100 <2 0 <2 0 <2 0 <2 0 2/17/1998 NA NA NA NA NA 6/24/1998 <200 <2 0 <2 0 <2 0 <2 0 -- -- __ 9/21/1999 310 235 <20 <2 0 <2 0 -- .. .. 12/14/1998 <200 432 <20 <2 0 5 11 3/31/1999 <200 <2 0 G2 0 <2 0 <2 0 6/11/1999 <200 548 <2 0 <2 0 <2 0 9/1011999 <1 000 1 590 <10 <10 123 12/3/1999 <200 262 <2 0 <2 0 208 4/3/2000 <200 252 <2 0 <2 0 <2 0 6/22/2000 <200 3,180 <2 0 <2 0 23 9/27/2900 NS NS NS NS NS 12/20/2000 <200 592 <2 0 <2 0 <2 0 3/I6/200I <200 912 <2 0 <2 0 <2 0 6/21/2001 <3 800* 5 000 f17* <77* <77* 9/13/2001 <100 90 <2 0 <2 0 <2 0 12/11/2001 <20 200 <2 0 <2 0 <2 0 3/14/2002 <5 0 26 <0 50 <0 50 <0 50 -- 6/19/2002 21 1 500 <0 50 063 70 28 - -- 9/12/2002 <25 140 <2 5 <2 5 <2 5 29 <2 5 <200 Oxygenates analyzed using USEPA Method 8260 TBA=Teri butyl alcohol µg/L=Analytical results in in[crogranis per leer MIRE=Methyl tert butyl ether <=Below detection Itnut for analytical methods used DIPE=DI isopropyl ether NA=Not analyzed ETBE=Ethyl tert butyl ether NS=Not sampled TAME Teri arayl methyl ether This sample was analyzed outside of the EPA recommended holding lane 7 The reported value exceeds the calibration curve but not the hnear range '=Raised MRL due to high analyte concentration requiring sample dilution k U5 BP ARCM2186\Quanerly\3_QTR 0252186 GWMR 3Q02 3 of 3