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of expedited site assessment tools and/or appropriately screened monitoring wells to provide data for these <br /> estimates. In deciding the location of transects and developing mass flux estimates, please consider the <br /> variable dissolution of MTBE and other contaminants from the source. We request that you install <br /> permanent monitoring wells and/or monitoring well clusters (screened at appropriate discrete depths with <br /> appropriate length of screen)to monitor the plume. Include your proposal for the installation of these wells <br /> in the work plan requested below. Please report your results in the SWI Report requested below. <br /> We request that you monitor the groundwater contaminant plumes on a quarterly basis. Additional wells <br /> will be required to define the down gradient extent of the plume if the plume continues to migrate or the <br /> fust set of wells fail to define the plume(s). In the event continued plume migration is identified,or impact <br /> to water supply wells is predicted please include recommendations for the installation of additional wells or <br /> remediation alternatives in the Quarterly Reports requested below. <br /> Please submit technical reports to the San Joaquin County Public Health Services Environmental Health <br /> Division(PHS/EHD),Attention: Ron Rowe, according to the following schedule: <br /> • November 1, 1997, 5:00 pm-Work Plan Addendum for completion of SWI <br /> • 45 days from work plan submittal-Soil and Water Investigation(SWI)Report <br /> • 210 days from work plan submittal-Corrective Action Plan <br /> We request that all required work be performed in a prompt and timely manner under the direct supervision <br /> (witnessed)of PHS/EHD staff. We have proposed a schedule for the submittal of the SWI Report and the <br /> CAP. Revisions to the proposed schedule shall be requested in writing with appropriate justification for <br /> anticipated delays. <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 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 Margare agorio, Supervisor <br /> Site Mitigation Unit Site Mitigation Unit <br /> Enclosure <br /> 1057QMER.doc <br /> 3 <br />