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ENVIRONMENTAL HEALTH `EP RTMEN'T <br /> SAN JOAQUIN COUNTY <br /> y Donna R.Herm,R:E.HS, Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor earl Borgman,R E.H.S <br /> Laurie A. Catulla,"R,E,H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R D1 <br /> Program Manager Douglas W.Wilson,R.E.H.S. <br /> e�• •; �,� a � Telephone: (209)$68-342(1 g <br /> Margaret Lagorio,'R_E.H.S. <br /> Fax: (209)464-013$ Robert McCtellon,R.E.H.s. <br /> Website:www.s gov.orgkW .Teff Carruesco,R.E.H:S. <br /> JOE T©STE JR MAY 3 0 2006 <br /> JT STORAGE <br /> 2480 TOSTE ROAD <br /> TRACY CA 95376 <br /> RE: Curtiss Pontiac-Cadillac SITE COM :1877 <br /> 2450 Toste Read <br /> Tracy CA 95376' <br /> San Joaquin County Environmental Health department(SJCrEHO)has reviewed Gtuarte y <br /> Report—First Quarter 2006(Report)dated May 18,2006,submitted on your behalf by AO*anced <br /> deoEnvironmental,.Inc.(ACE),and has the following comments. <br /> In the Report AGE recomrhenda discontinuing quarterly monitoring of the groundwater far riatural <br /> attenuation parameters. In their Corrective Action Plan for this site,AGE had recommended <br /> overexdavation of contaminated soil followed by monitored natural attenuation (MNA)of the <br /> remaining groundwater contamination. AGF now considers MNA to be not tenable,and <br /> recommends evaluating options for active remediation of the remaining groundwater <br /> contamination. The methane and manganese data are;suggestive:of`active natural attenuation <br /> processes, but the nitrate,sulfate and iron data appear to be ambiguous, S,ICIFHD:agrees that it <br /> would be appropriate to consider utilizing an engineered remediation system to address:'impacteO <br /> groundwaterat this time Please submit a new feasibility study evaluating active groundwater <br /> remediation methods to our.Office no later than July 28,2006. Annual monitoring for natural <br /> attertta'ation pararrieters is approved. <br /> AGE previously redommended switching from quarterly to annual or semi-annual monttoa6g and <br /> sampling of this sites groundwater monitoring wells. SJC/EHD does not agree with this <br /> recommendation,f�4 would agree to a rnod%fied sampling schedule of the perimeter and offsite <br /> wells. Quarterly groundwater monitoring and sampling of wells MW-1A, M1+ -1B, MVV4 and <br /> MW 4 mush continue. Annual or semi-annual monitoring and sampling of wells W:72A, Milt(-2B <br /> NW-3,MW-5, MW-6 and CLMW-3 should be sufficient. <br /> If,you have any questions please.call Lori Duncan at(209)4468.0337. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department. <br /> Lo ibuncan;Senior REHS Nue!0.Henderson.,Jr. PO <br /> 6P' <br /> 4l.Site: Rigation.unlit.IV LC)FalSite:.Mitigatiowunit.IV <br /> co: James Barton,CVRWQCB <br /> Eyrerle Fisher;:AGE <br />