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FILE COPY <br /> .PUBLIC HEALTH SERVI( S oP roc <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �. . P.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4c d8e' <br /> 209/468-3420 <br /> ED RALSTON <br /> TOSCO MARKETING COMPANY OCT 3 12000 <br /> 1280 LEAD HILL ROAD, SUITE 120 <br /> ROSEVILLE CA 95661 <br /> RE: UNOCAL STATION#5886 SITE CODE: 1176 <br /> 2701 MARCH LANE <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PH8/EHD) has reviewed the <br /> October 11, 2000 correspondence from Tosco Marketing. The letter requests discontinuation of interim <br /> remediation activities at the site and a meeting with,PHS/EHD. PHS/EHD provides the following <br /> comments and directives. <br /> Reduction of contaminant mass (MtBE in particular) and plume migration at any underground storage tank <br /> (UST) site Iis critical. Comprehensive and frequent assessment of plume dynamics, receptor risk, and the <br /> effects of remediation are required. Corrective Action (and interim corrective action) is defined in <br /> California Code of Regulations (CCR) Title 23, Division 3, Chapter 16, Article 11, Section 2722.. <br /> Groundwater extraction is included as an interim corrective action. PHS/EHD has conditionally approved <br /> the start up of your interim remediation system subject to applicable laws and regulations. CCR Title 23, <br /> Division 3;Chapter 16,Article 11, Section 2727, Verification Monitoring Phase, requires the evaluation of <br /> corrective action remediation effectiveness. Accordingly, PHS/EHD and the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) require sampling, analyses, and reporting of remediation <br /> effectiveness. Tosco has failed to comply with this requirement. Therefore, a groundwater sample must be <br /> collected and analyzed by a certified laboratory so that groundwater contaminant mass removal by <br /> extraction from the tank can be calculated. PHS/EHD and CVWRQCB personnel have agreed that the <br /> groundwater sample should be collectedfrom the well prior to purging. In order to transport and ultimately <br /> treat or dispose of contaminated groundwater, the composition and concentration of chemical constituents <br /> must be quantified and reported to PHS/EHD and the CVRWQCB. <br /> PHS/EHD now directs Tosco to quantify and report any mass (concentration per unit volume) removal of <br /> contaminants from the above referenced site. ,Tosco shall request that the groundwater sample be analyzed <br /> for a complete suite of petroleum constituents and fuel additives by EPA Method 8260B. Tosco shall <br /> report the results of analyses and remediation effectiveness with recommendations and conclusions.from an <br /> appropriately registered professional on a quarterly basis. Disposal at the Tesoro Rodeo facility must meet <br /> all local, st@,ate and federal standards. <br /> S�o d you have questions regarding this correspondence please contact Ron Rowe at(209)468-0342. <br /> Donna Heran,REHS,Director <br /> Envoi jonmmeental 1jealth Division <br /> onald Rowe, Sr. REHS Margar Lagono, Supe isor <br /> Site Mitigation Unit Site Mitigation Unit <br /> CC: CVRWQCB—Marty Hartzell 1176 CA Cm tLeaer2 <br /> A Division of San Joaquin County Health Care Services <br /> a <br /> z <br />