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r7✓1 I <br /> content, estimates of transmissivity, dispersivity, groundwater flow rate, contaminant <br /> mass in soil and groundwater, and validated contaminant degradation rates. PHS/EHD <br /> has not recommended or approved fate and transport modeling to date, the plume is not <br /> characterized and risk assessment is incomplete. <br /> Please submit and amended workplan to PHS/EHD addressing the issues above for final <br /> approval as soon as possible. An approved workplan is required prior to implementing <br /> any corrective action activities. PHS/EHD directs the responsible party to submit the <br /> amended workplan satisfying the conditions above and implement the workplan <br /> f before September 30, 1999. <br /> Failure to comply with PHS/EHD directives may result in referral to the San <br /> Joaquin County District Attorney's Office. <br /> Should you have questions regarding this correspondence please contact Ron Rowe at <br /> (209) 468-0342. <br /> Donna Heran, REHS,Director <br /> Environmental Health Division <br /> Ronald !Rowe, Sr. REHS Margate agorio, Supervisor <br /> LOP/Sita Mitigation Unit Site Mitigation Unit <br /> c: SIC District Attorneys Office - David Irey <br /> CVRWQCB - Mark List <br /> CH2M HILL—Elizabeth Dodge <br /> S WRCB —Jim Munch <br /> Geosyntex Consultants—Nancy Bice <br /> RON/WORD/i IOfilbert compliance letter <br /> t <br /> i <br /> 2 <br />