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ENVIRONMENTAL HEALTH DEPARTMENT <br /> Pqu�N <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K Heran,R E H S man Bor R E H S <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,Carl Borg R E H S ,R D 1 <br /> Al Olsen,R E H S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> �Q � P Program Manager Telephone (209) 468-3420 Margaret Lagorto,R E H S <br /> o a Laurie A Cotuila,R E H S p <br /> Program Manager FaX (209) 464-0138 Robert McClellon,R E H S <br /> S S Mark Barcellos,R E H S <br /> MAR 0 8 2004 <br /> PAUL SUPPLE _ <br /> ATLANTIC RICHFIELD COMPANY <br /> PO sox 6549 <br /> MORAGA CA 94570 MAR 0 200 !J C (DPY <br /> BY:-------------------- <br /> RE ARCO Station #595 SITE CODE 0707 <br /> 6100 N Hwy 99 <br /> Stockton CA 95212 - <br /> San Joaquin County Environmental Health Department (SJCIEHD) has reviewed <br /> "Quarterly Groundwater Monitoring Report, Fourth Quarter 2003"(Report) dated <br /> January 13, 2003 submitted on your behalf by SECOR International incorporated <br /> (SECOR) and has the following comments <br /> Reported analytical results from groundwater monitoring wells at this site indicate that <br /> the lateral and vertical extent of the petroleum hydrocarbon contamination has not been <br /> defined Please submit a work plan to continue the investigation of the contamination at <br /> this site The work plan is due for submittal to SJCIEHD no later than April 30, 2004 <br /> Please prepare a site conceptual model (SCM) for this site The SCM should <br /> demonstrate where the contaminants came from, how they move through the <br /> subsurface, how they will respond to changes in the groundwater flow characteristics or <br /> to potential remediation efforts, and what their ultimate environmental fate may be <br /> Include in the SCM maps and cross sections showing the site hydrogeological <br /> framework and potential subsurface contaminant migration pathways, and a rose <br /> diagram of the historical groundwater flow direction The SCM is due April 30, 2004 <br /> If you have any questions please call Lori Duncan at (209) 468-0337 <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lon Duncan, Senior REHS Nuel C Henderson, Jr , RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc James Barton, CVRWQCB <br /> Rusty Benkosky, SECOR <br />