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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> s a Donna K Heran,R E.H.S. Unit Supervisors <br /> 304 East Weber Avenue Th" <br /> _ Director , ]rd Floor Carl Borgman,R.E_H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> O�6 Program Manager Douglas W.Wilson,R.E.H.S. <br /> � Laurie A.Cotulla,R.E.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> ' Program Manager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> ' PAUL SUPPLE SEP 15 2003 <br /> ATLANTIC RICHFIELD COMPANY' <br /> P O BOX 6549 <br /> MORAGA CA 94570 <br /> RE: Arco AM PM No. 5450 SITE CODE: 1296 <br /> 1617 Fremont Street <br /> Stockton,California - <br /> By letter dated August 16, 2004, San Joaquin County Environmental Health Department (EHD) <br /> proposed that a closure/no further action required report for the above-referenced site be prepared and <br /> submitted to EHD and the Central Valley Regional Water Quality Control Board (CVRWQCB) for <br /> 1 evaluation. EHD has reviewed current site data prepared by URS Corporation (URS) on your behalf <br /> and believes that conditions may warrant site closure. The only contaminant of concern, methyl <br /> tertiary-butyl ether (MTBE), has been reported in groundwater from monitoring well MW-2 at <br /> concentrations at or below 21 micrograms per Iiter(ttg/L)since February 2004. <br /> EHD requests that you submit a closure summary report or a report showing why <br /> case should <br /> remain open by December 30, 2005. This report should include required data listed inCVRWQCB' Tri-Regional Board Staff Recommendations. While all items listed in Section 6.6 of the document <br /> should be addressed, EHD is particularly interested in the following to facilitate closure <br /> consideration: <br /> • Cross-sections showing correlated soil iI <br /> thologtes, contaminant concentrations, lateral and <br /> vertical extents of impacted soil and groundwater, and potential or actual contaminant <br /> migration pathways. <br /> • Tables of current and historical analytical soil and groundwater data. <br /> • Calculations showing estimates of the present dissolved and adsorbed contaminant masses of <br /> ' MTBE. <br /> • A modeled estimate of the future impact to groundwater from adsorbed contaminants, and <br /> • An estimate of the projected maximum plume extent resulting from the modeled additional <br /> ' impact of groundwater. <br /> If you have any questions regarding this letter please contact Vicki McCartney at (209) 468-3456 or <br /> by electronic trail at vmccartney@sjcehd.com. <br /> Donna Heran, RENS,Director <br /> Environmental Health Department <br /> Victoria L.McCartnUY' Snior HS Nuel C. Henderson,Jr.,PG <br /> Unit N-Site Mitigation Unit W- Site Mitigation <br /> c: Vernon Elarth,PG-URS <br /> James L.L. Barton, PG-CVRWQCB <br />