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amed - <br /> October <br /> 29, 2010 <br /> Project 0132900000 <br /> Ms. Amy Terrell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Subject: Groundwater Interim Remedial Action Plan <br /> UniFirst Facility, Stockton, California <br /> Dear Ms. Terrell: <br /> On behalf of UniFirst Corporation (UniFirst), AMEC Geomatrix, Inc., is pleased to present the <br /> enclosed Groundwater Interim Remedial Action Plan for the UniFirst facility located at 819 North <br /> I lunter Street in Stockton, California. UniFirst has completed the characterization of the <br /> Chemicals in groundwater from their site. The characterization of the chemicals (chlorinated <br /> volatile organic Compounds [CVOCs]) and a selected remedial alternative, monitored natural <br /> attenuation (MNA), are described in the Groundwater Corrective Action Plan submitted to the <br /> California Regional Water Quality Control Board—Central Valley Region (RWQCB) in April <br /> 2010. <br /> In an August 2010 letter to UniFirst, the RWQCB concurred that the CVOCs in groundwater <br /> beneath the site and vicinity are being degraded by natural processes and that MNA is an <br /> appropriate groundwater remediation strategy for the site. However, the RWQCB requested <br /> that UniFirst propose a remediation plan by October 29, 2010, to reduce the mass of CVOCs <br /> in groundwater more rapidly than by natural attenuation alone prior to adopting MNA as the <br /> final groundwater remediation strategy. This Groundwater Interim Remedial Action Plan is <br /> being submitted in response to the RWQCB's request. <br /> UniFirst proposes to implement an in situ remediation method to reduce the mass of CVOCS <br /> in groundwater at the site. UniFirst will conduct a pilot test in the area where CVOC <br /> concentrations in groundwater are the highest to evaluate the effectiveness of this method <br /> and to obtain performance data that could be used for subsequent application to other <br /> locations, if necessary. <br /> AMEC Geomalrix,Inc. <br /> 1281 E.Alluvial Avenue,Suite 101 <br /> Fresno,California <br /> USA 93720-2659 <br /> Tel (559)264-2535 <br /> Fax (559)264-7431 AMEC Geomatrix <br /> www.amecgeomairixinc.com <br />