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l <br /> t <br /> PUBLIC HtALTH SERVICIS <br /> SAN JOAQUIN COUNTY <br /> / N':ILL <br /> ENVIRONMENTAL HEALTH.DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> �/FOR <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 4 \ <br /> ED RALSTON /� <br /> TOSCO MARKETING COMPANY \\`.JJ/ 11JI_' u <br /> 1280 LEAD HILL ROAD, SUITE 120 <br /> ROSEVILLE CA 95661 FEB 2 2 2000 <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(PHS/EHD)has reviewed the <br /> Corrective Action Plan by Environmental Resolutions Incorporated dated December 28, 1999. PHS/EHD <br /> provides the following comments and directives. <br /> Analytical data from the site listed above confirms the presence of petroleum hydrocarbons in <br /> groundwater. A large mass of MTBE is present which may endanger beneficial use groundwater. Pump <br /> tests from on-site extraction wells suggest that partial hydraulic control of MTBE migration may be <br /> feasible. Reduction of contaminant mass and reduction of plume migration at this site are critical. <br /> Comprehensive and frequent assessment of plume dynamics, receptor risk, and the effects of remediation <br /> are strongly recommended by PHS/EHD. <br /> Pump and Treat System <br /> PHS/EHD has conditionally approved the start up of the remediation system as listed below. <br /> The proposal is considered an interim remedial action, the design proposed is not to be considered a final <br /> remediation strategy. The plume is currently undefined, however, in accordance with corrective action <br /> regulation interim remedial action can occur concurrently with any phase of corrective action. A Corrective <br /> Action Plan with cleanup levels complying with CCR, Title 23, Division 3, Chapter 16, Section 2721(b), <br /> 2726 and 2727 will be required following the implementation of this interim remedial action. At this time <br /> no clean up goal is implied or approved. A public participation notice will be posted at the site by <br /> PHS/EHD on February 22,2000. <br /> A limited radius of influence is expected at the discharge rate proposed (5,000 gallons per week). <br /> PHS/EHD recommends that the responsible party simultaneously monitor, document, and report the extent <br /> of plume capture and escape vertically and laterally. Modifications to the remediation system and plume <br /> monitoring system may be necessary and timely responses by Tosco are important. <br /> The actual composition of the contaminant plume from this unauthorized release may not be known to <br /> PHS/EHD. Examples are impurities and by-products in fuel delivered and dispensed which may have been <br /> released to the subsurface, including degradation compounds. Disposal at the Tesoro Rodeo facility must <br /> meet all local,state and federal standards. <br /> A Division of San Joaquin County Health Care Services <br />