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PUBLIC HEALTH SERVICtS POUIp O <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �... <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4`icoa; <br /> 209/468-3420 <br /> ED RALSTON FILE COPY <br /> TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL ROAD, SUITE 120 MAR 19 1999 <br /> ROSEVILLE, CA 95661 <br /> RE: UNOCAL STATION#5886 SITE CODE: 1176 <br /> 2701 MARCH LANE <br /> STOCKTON CA <br /> As a result of reviewing the most recent workplan, report and correspondence submitted <br /> by Environmental Resolutions Incorporated (ERI) dated March 2, 1999 on behalf of <br /> Tosco Marketing Company (Tosco) San Joaquin County Public Health Services <br /> Environmental Health Division (PHS/EHD) provides the following comments. <br /> The report for recent Cone Penetration Testing (CPT), soil, and groundwater sampling <br /> dated March 2, 1999 provides documentation which clearly indicates the presence of a <br /> large fuel hydrocarbon plume not less than 400 feet in length along an East to West axis. <br /> Contaminants found in groundwater include TPH as diesel, MtBE, EtOH, and McOH. <br /> The groundwater plume is currently undefined laterally and vertically. <br /> PHS/EHD hereby approves your request to install boreholes completed as monitor wells <br /> proposed as MW-8, 9, and 10 (Shallow, Intermediate and Deep) as well clusters <br /> employing individual boreholes limited to one well casing per borehole. At this time <br /> PHS/EHD has not received an application for a permit to install monitor wells. Please <br /> submit an application with the appropriate fee ($89.00) for review at your earliest <br /> convenience in order to accomplish your proposed install date of March 24, 1999. <br /> PHS/EHD also recommends that the responsible parry construct monitor wells which <br /> eliminate the potential to create vertical conduits. <br /> As required in correspondence from PHS/EHD dated July 24, 1997, "We (PHS/EHD) <br /> request that you 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 it <br /> continues to migrate. Please discuss the results of your plume monitoring in your <br /> Quarterly Reports. In the event continued plume migration is identified, please include <br /> t <br /> A Division of San Joaquin County Health Care Services <br />