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Lauf. h i <br /> Report the results of your investigation to this agency within 30 days of completion of the approved scope <br /> of work. <br /> You are requested to properly characterize the hydrogeology and groundwater flow conditions in the <br /> vicinity of your site. We also request that you evaluate local groundwater flow conditions and establish a <br /> site-specific localized flownet that is dependent on geologic conditions and is reflected on geologic cross <br /> sections and fence diagrams. Additionally you are required to prepare a rose diagram displaying <br /> groundwater gradient intensity and flow direction. The rose diagram shall be updated to show all historic <br /> groundwater gradients and flow directions to date and shall be provided for all future. monitoring event <br /> reports. All plot plan and cross section drawings shall show the location of former and present UST <br /> appurtenances. <br /> We request that you continue to monitor the groundwater contaminant plumes on a quarterly basis. <br /> Additional wells will be required to define the down gradient extent of the plume if the plume continues to <br /> migrate or the first set of wells fail to define the plume(s). In the event continued plume migration is <br /> identified, or impact to water supply wells is predicted please include recommendations for the installation <br /> of additional wells or remediation alternatives in your Quarterly Reports. <br /> Please submit technical reports to the San Joaquin County Public Health Services Environmental Health <br /> Division(PHS/EHD),Attention:Ron Rowe. <br /> PHS/EHD recommends that all site assessment and remediation related activities in which the <br /> responsible party(s)engages in and anticipates!reimbursement from the Underground Storage Tank <br /> Cleanup Fund(USTCF)be reviewed and cost pre-approved prior to commencing work. <br /> Should you have questions regarding this correspondence please contact Ron Rowe at(209)468-0342. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Ronald Rowe,Sr.REHS Margaret agorio, Supervisor <br /> Site Mitigation Unit Site Mitigation Unit <br /> Enclosures <br /> USTCF—Sandy Gill <br /> 620CHARTER90day.doc <br /> 2 <br />