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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> c.. P. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellan,R.E.H.S. <br /> er <br /> Program Manager Fax: (209) 464-0138 <br /> g g 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 g 2004gY. <br /> COPY <br /> RE: ARCO Station #595 SITE CODE: 0707 <br /> 6100 N. Hwy 99 <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJC/EHD) 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 SJC/EHD 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 /> Lori 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 />