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14800.Hwy 99,Manteca <br /> Page 2 <br /> • MTBE and 1,2-DCA were detected in groundwater samples collected <br /> from B 1 at concentrations comparable to MTBE and 1,2-DCA <br /> concentrations remaining onsite during the site closure in 1998. <br /> • Assuming that the petroleum hydrocarbon release occurred prior.to 1988, <br /> contaminant migration advanced vertically to approximately 15. feet bsg <br /> where a clayey. sand/silt/clayey silt layer retarded the advancement of <br /> contaminants. This is evidenced by the detections for TPH-g, TPH-d, <br /> and total xylenes found only in soil samples collected at 15 feet bsg in <br /> Bl.. . Contaminants were not detected in Bl. at 25 and 35 feet bsg, nor. <br /> were contaminants detected in soil samples collected from borings B2 <br /> and B3.. <br /> • Results from a one-hundred-year. fate. and transport study predicted that <br /> groundwater. at the D 1. location should not be impacted from the aged <br /> petroleum hydrocarbon-impacted soil. . TPH mass is estimated at 52 <br /> pounds. <br /> 03/15/06 Site discussed with CVRWQCB for potential site closure concurrence.. <br /> f <br />