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<br /> Groundwater Analytical R -Oxygenate Compounds
<br /> Tosco(Unocal)Service Station#5886
<br /> 2701 West March Lane
<br /> Stockton,California
<br /> WELL ID DATE ETHANOL TBA MTBE DIPE ETRE TAME 1,2-DCA ED$
<br /> (PpbJ (PPb) (PPb) fppb) (Ppb) (PPb) (pp b) (Ppb)
<br /> MW-2 08/03-04/00 ND' ND' 15,600 ND' ND' ND'
<br /> (cont) 11/16-17/00 ND 1,200 19,000 ND ND 54
<br /> 02/05-06/01 ND' ND' 6,300 ND' ND' ND' ND' ND'
<br /> 04/30/01 -- -- 3,120 -- -- --
<br /> 05/07-08/01 ND' ND' 2,900 ND' ND' ND' ND' ND'
<br /> 08/20-21101 <25,000 <2,500 3,600 <50 <50 <50 <50 <50
<br /> 11119-20101 <12,000 <500 4,000 <25 <25 <25 <25 <25
<br /> 02/11-12102 <12,000 <2,500 4,600 <50 <50 <50 <50 <50
<br /> 05/02-03/02 <500 <100 28 <2 0 <2 0
<br /> <20 <2 0 <2 0
<br /> MW-3 I2/01/97 ND' ND' 2,200 ND' ND' NDI _-
<br /> 03/25/98 ND' 6,100 8,500 ND' ND' ND'
<br /> 06/17/98 ND 2,600 7,300 ND ND 20 _
<br /> 09/01/98 ND ND 4,500 ND ND 99
<br /> 12/03/98 ND' ND' 5,000 ND' ND' ND' -- --
<br /> 03/01/99 ND' ND' 31,000 ND' ND' ND'
<br /> 06101-02199 ND' ND' 36,000 ND' ND' ND'
<br /> 08116-17199 ND' ND' 17,000 ND' ND' ND'
<br /> 11/29-30/99 ND' ND' 21,000 ND' ND' ND'
<br /> 02/28-29/00 ND' ND' 42,000 ND' ND' ND'
<br /> 05110-11100 NO 112,000 122,000 ND' ND' ND'
<br /> 08/03-04100 NO ND' 20,900 ND' ND' ND'
<br /> 11/16-17100 ND' ND' 11,000 ND' ND' ND'
<br /> 02/05-06/01 ND' ND' 18,000 ND' ND' ND' ND' ND'
<br /> 04/30/01 -- -- 11,800 -- -- -- -- --
<br /> 05/07-08/01 ND' ND' 11,700 ND' ND' ND' ND' ND'
<br /> 08/20-21101 <38,000 <3,800 5,200 <77 <77 <77 <77 <77
<br /> 11/19-20101 <20,000 <800 6,800 <40 <40 <40 <40 <40
<br /> 02111-12/02 <33,000 <6,700 5,000 <130 <130 <130 <130 <130
<br /> 05/02-03102 <25,000 <5,000 6,500 <100 <100 <100 <100 <100
<br /> 5886 x1s/#180137 21 As of 05/03/02
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