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Y ` ' <br /> site, plot it on the groundwater contour maps. All future plot and cross section drawings shall show the <br /> location of former tank systems. Report your results in the SWI Report requested below. <br /> Additionally, if you have any fuel additives/blending agents, or any other contaminant data previously <br /> collected at your site that has not been submitted to PHS/EHD, you are requested to notify this agency, <br /> submit this data immediately and update cumulative data tables accordingly. <br /> We request that you employ approaches to estimating contaminant mass flux across plume transects or <br /> fences located perpendicular to the plume(s). We request the use of expedited site assessment tools and/or <br /> appropriately screened monitoring wells to provide data for these estimates. In deciding the location of <br /> transects and developing mass flux estimates,please consider the variable dissolution of contaminants from <br /> the source. We request that you install permanent monitoring wells and/or monitoring well clusters <br /> (screened at appropriate discrete depths with appropriate length of screen)to monitor the plume. Include <br /> your proposal for the installation of these wells in the work plan addendum requested below. Please report <br /> 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 /> next 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 15, 1997,5:00 pm -Complete and Submit Comprehensive Cross Sections to PHS/EHD <br /> • December 1,1997, 5:00 pm-Work Plan Addendum for completion of Soil and Water Investigation <br /> • 45 days from work plan submittal-Soil and Water Investigation(SWI)Report <br /> • 210 days from work plan submittal-Corrective Action Plan(CAP) <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 and anticipate reimbursement from the Underground Storage Tank <br /> Cleanup Fund (USTCF) be reviewed and pre-approved prior to commencing work. PHS/EHD also <br /> recommends that the responsible party(s) adhere to the USCTF three bid requirement for this and <br /> all scopes of 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 /> zwj " <br /> Ronald Rowe, Sr.REHS Margaret gorio, Supervisor <br /> LOP/Site Mitigation Unit Site Mitigation Unit <br /> Enclosure 110filb.doc <br /> 3 <br />