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equivalent and the curre*%odpillary fringe. Additional samples may be N reired at the discretion of the <br /> PHS/EHD site inspector. Discuss your proposal for performing this work in the workplan requested above. <br /> You are requested to properly characterize the hydrogeology and groundwater flow conditions in the <br /> vicinity of your site. During your investigation activities, we request that you gather detailed lithologic <br /> information using borings, and continuous core sampling, with other methods to understand the <br /> hydrogeology at your site. Discrete soil samples collected from each significantly different lithological <br /> unit shall be analyzed by a qualified laboratory for permeability, porosity, bulk density, moisture, and <br /> organic carbon content. We also request that you evaluate local groundwater flow conditions and establish <br /> a 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 for groundwater <br /> Cr <br /> gradient at this site, plot it on the groundwater contour maps. Plot and cross section drawings shall show <br /> the location of former and present tank systems when known. Report your results in the Soil and Water <br /> Investigation(SWI)Report requested below. <br /> Additionally, if you have any MTBE, other fuel additives/blending agents, or any other contaminant data <br /> previously collected at your site that has not been submitted to PHS/EHD, you are requested to submit this <br /> data immediately and update cumulative data tables accordingly. <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 /> first 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 site Quarterly Reports. <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 /> • March 1, 1998, 5:00 pm-Work Plan 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 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 Margar agorio, Supeicor <br /> Site Mitigation Unit Site Mitigation Unit <br /> Enclosure <br /> 49wilson.doc <br /> 2 <br />