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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ?a <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 fioa`' <br /> 2091468-3420 <br /> CO <br /> JAY L & VL SINCLAIR D <br /> -)y <br /> SINCLAIR TRUCKING <br /> 3784 LINNE ROAD DEC Q 81999 <br /> TRACY CA 95376 <br /> RE: SINCLAIR TRUCKING SITE CODE: 1916 <br /> 3780 W LINNE ROAD <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) has reviewed the <br /> files for the above referenced site including recent and historic quarterly groundwater sampling data <br /> submitted to this office. A report titled 3r`t Quarter Groundwater Monitoring dated November 8, 1999 by <br /> Geological Technics Inc. (GT) for the above referenced site suggests that the lateral and vertical extent of <br /> contaminant distribution is currently undefined, particularly downgradient. Groundwater gradient and flow <br /> direction trends toward the on-site domestic drinking water well. In correspondence from PHS/EHD dated <br /> August 6, 1999 a request for information including "a copy of the calculations used to determine the <br /> groundwater gradient" at this site has not been received. For all future quarterly groundwater monitoring <br /> reports please include all data, formulas and calculations for groundwater gradient determinations for <br /> verification purposes. Groundwater plumes which may migrate toward drinking water supply wells are <br /> considered high risk scenarios where mitigation measures should be implemented promptly. Please <br /> continue quarterly groundwater monitoring, sampling,analyses and reporting at this site. <br /> On August 6, 1999 PHSIEHD also directed the responsible party to "submit a workplan to PHSIEHD <br /> which when implemented will define the soil and groundwater plume at this site". On September 17, 1999 <br /> PHS/EHD correspondence granted an extension for the submittal of the workplan to October 15, 1999. As <br /> of this date PHS/EHD has not received the required workplan or gradient calculation information. The <br /> responsible party at this site is no longer in compliance with correction action directives. Failure to comply <br /> may affect your reimbursement eligibility(Underground Storage Tank Cleanup Fund). <br /> You are now directed to submit a workplan to PHS/EHD which when implemented will define the <br /> soil and groundwater plume at this site. The workplan must be received at PHSIEHD offices no later <br /> than S:OOpm on January 15,2000. <br /> PHSIEHD strongly recommends that the responsible party at this site routinely request at least three bids <br /> for all scopes of work proposed related to corrective action activities at this Underground Storage Tank site. <br /> All site work must be approved by PHS/EHD first then cost pre-approved by the Underground Storage <br /> Tank Cleanup Fund(USTCF)prior to commencing work. <br /> Should you have questions regarding this correspondence please contact Ron Rowe at (209) 468-0342 or <br /> Margaret Lagorio at(209)468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Ronald Rowe, Sr. REHS Margare agorio, REHS <br /> LOP/Site Mitigation Unit Supervisor <br /> Cc: CVRWQCB—Marty Hartzell <br /> Geological Technics-Ray Kablanow <br /> A Division of San Joaquin County Health Care Services <br />