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August 13, 2007 <br /> Project 13290.000 <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: Revisions to the Additional Groundwater Investigation Work Plan <br /> UniFirst Facility <br /> Stockton, California <br /> Dear Ms. Terrell: <br /> On behalf of UniFirst Corporation (UniFirst), Geomatrix Consultants, Inc. (Geomatrix), has <br /> prepared this letter providing you with an interim report concerning the status of work <br /> undertaken to date under the April 15, 2007, Additional Groundwater Investigation Work Plan <br /> (Work Plan) for the UniFirst facility located at 819 North Hunter Street in Stockton, California <br /> (the site). Based on interim results from that work,we also intend to undertake additional field <br /> activities, as described on the next page. <br /> BACKGROUND <br /> While assessing soil and groundwater conditions in the vicinity of a removed underground fuel <br /> storage tank, chlorinated volatile organic compounds (VOCs), primarily tetrachloroethylene, <br /> were detected in groundwater beneath the site. In a January 30, 2007, letter to UniFirst,the <br /> California Regional Water Quality Control Board—Central Valley Region(RWQCB)requested <br /> that UniFirst assess the nature and extent of the VOCs in groundwater and conduct quarterly <br /> groundwater monitoring. Geomatrix prepared the April 2007 Work Plan for UniFirst's submittal <br /> to the RWQCB. The Work Plan was approved by the RWQCB in a June 13, 2007, letter to <br /> UniFirst. As requested in the June 2007 letter, an estimated schedule for completion of the <br /> groundwater assessment and groundwater monitoring was presented in a June 27, 2007, email to <br /> Ms. Amanda Montgomery of the RWQCB from Mr. William Pipes of Geomatrix. The schedule <br /> consisted of the following estimated completion dates: <br /> Task 1 —Groundwater Sampling from the Existing On-Site Wells: by July 31, 2007 <br /> Task 2—Downgradient Groundwater Sampling: by August 31, 2007 <br /> Task 3 —Additional Monitoring Well Installation: by August 31, 2007 <br /> Task 4—Evaluation of Potential Sources: by August 31, 2007 <br />