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TABLE 4
<br /> GROUNDWATER ANALYTICAL RESULTS
<br /> FOR OXYGENATES AND ADDITIONAL COMPOUNDS
<br /> ARCO Service Station No 6100
<br /> 25775 Patterson Pass Road
<br /> Tracy,California
<br /> Nitrate
<br /> Sample Date MTBE TBA TAME DIPS ETBE Ethanol 1,2-DCA EDB as NO3
<br /> ID Collected ( ) ( ) ( ) ( ) ( /L) OWL) OWL) ( ) (m )
<br /> VW-1 06/22/04 <1,000 A <40,000 A <2,000 A <2,000 A <2,000 A <200,000 A 2,000 A <1,000 A NA
<br /> 09/07/04 620 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA
<br /> VW-2 02/08/01 395 218 <2 00 <2 00 <2 00 NA NA NA <1 0
<br /> 03/26/02 350 <50[1] <5 0[]] <5 0[1] <5 0[1] NA NA NA NA
<br /> 03/16/04 61 A <200 A <10 A <10 A <10 A <1,000 A 16 A <5 0 A NA
<br /> 06/22/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A <250 A <250 A NA
<br /> 12/21/04 120 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA
<br /> 03/15/05 <120 A <5,000 A <250 A <250 A <250 A <25,000 A <120 A <120 A NA
<br /> 06/21/05 58[6] J <400 A <10 A <10 A <10 A <2,000 A <10 A <10 A NA
<br /> VW-3 02/08/01 1,000 387 570 <2 00 <2 00 NA NA NA <1 0
<br /> 03/26/02 490 <100[1] <10[1] <10[1] <10[1] NA NA NA NA
<br /> 03/16/04 180 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA
<br /> 06/22/04 970 A <20,000 A <1,000 A <1,000 A <1,000 A <100,000 A <500 A <500 A NA
<br /> 09/07/04 360 A <4,000 A <200 A <200 A <200 A <20,000 A <210 A <100 A NA
<br /> 12/21/04 170 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA
<br /> 03/15/05 <50 A <2,000 A <100 A <100 A <100 A <10,000 A <50 A <50 A NA
<br /> 06/21/05 180[6] J <1,000 A <25 A <25 A <25 A <5,000 A 100 A 37 A NA
<br /> VW4 02/08/01 1,890 <20,000 <200 <200 <200 NA NA NA <10
<br /> 09/18/02 1,200 <2,500 <250 <250 <250 NA NA NA NA
<br /> 06/22/04 <250 A <10,000 A <500 A <500 A <500 A <50,000 A 960 A <250 A NA
<br /> 06/21/05 <500 A <20,000 A <500 A <500 A <500 A <100,000 A 970 A <500 A NA
<br /> Arco-61 00�_Quaxterly.Data Page 3 of 6 5rKAru5
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