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e 4 <br /> Groundwater Analytical Results (EPA Method 8010) <br /> Former Unocal Service Station#0123 <br /> 1034 Central Avenue <br /> Tracy, California <br /> Well ID Date Cis-1,2-DC1E~ Trans-1,2-DCE Tetrachloroetherte Trichloroethene <br /> (Ppb) (ppb) (ppb) (ppb) <br /> U-3 06/22/98 ND ND 1 9 ND <br /> (cont) 09/28/98 ND ND 30 ND <br /> U4 03/03/97 ND ND ND ND <br /> 06104/97 072 ND 4 1 ND <br /> 09/03/97 ND ND 47 ND <br /> 12/02/97 ND ND 3 1 ND <br /> 03/24/98 27 3 7 48 14 <br /> 06/22/98 059 063 3 7 066 <br /> 09/28/98 ND ND 28 ND <br /> EXPLANATIONS- <br /> Laboratory analytical results prior to March 24, 1998, were compiled from reports prepared by MPDS Services, Inc <br /> Cts-1,2-DCE = Cis-1,2-Dichloroethene <br /> Trans-1,2-DCE = Trans-l,2-Dichloroethene <br /> ppb = Parts per billion <br /> ND = Not Detected <br /> Chloroform was detected at a concentration of 0 77 ppb <br /> 1,1,1-Trichloroethane was detected at a concentration of 0 86 ppb <br /> Note All EPA Method 8010 consutuc.n[s were ND, except as reported above <br /> ANALY11CAL METHOD.i <br /> EPA Method 8010 for Halogenated Volatile organic compounds(HVOC's) <br /> 0123 x1sl#280047 2 As of 09/28/98 <br />