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1 <br /> 1615 Eleventh Street, Tracy <br /> I Page 2 <br /> plan can be implemented. Post remedial groundwater monitoring will be <br /> required to demonstrate the effectiveness of the remediation. <br /> If excavation of contaminated soils is performed, PHS/EHD would require <br /> sampling and analysis of the groundwater in the monitoring wells at least twice <br /> (two quarters) after the excavation work is performed to verify the effectiveness <br /> of the remediation. Once site data demonstrates contaminant levels are <br /> decreasing in the groundwater and the contaminant mass in the soil has been <br /> reduced and is no longer continuing to degrade the groundwater, PHS/EHD will <br /> request concurrence from the Central Valley Regional Water Quality Control <br /> Board for a "No Further Action Required" determination for this site. <br /> If you have any questions, please feel free to contact Jeff Wong at (209) 468- <br /> 0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division I <br /> Jeffrey Wong , EHS, Trainee Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> JW:lb <br /> c: Horizon Environmental Inc. - Ken Mateik f <br /> c: RWQCB, Central Valley Region - Pat Anderson <br /> i <br /> 1 <br /> j <br />