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BLAES Environmental Management, Inc. <br /> � <br /> 0ECEgD fl D <br /> JAN 18 20OZ <br /> ENVIRONMENT HEALTH <br /> January 15, 2002 PERMITISERVICES <br /> i <br /> Mr Michael Infama <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Addendum to Workplan for Investigative and Remedial Testing Activities <br /> (Dated November 8, 2001) <br /> U-Haul Facility#709-50 <br /> 2701 North Wilson Way <br /> Stockton, California <br /> Site Code 1772 <br /> Dear Mr Infurna <br /> Blaes Environmental Management, Inc , on behalf of Amerco Real Estate Company /U-Haul <br /> International, received the San Joaquin County Public Health Services (SJCPHS) letter and <br /> response regarding the above-referenced workplan submitted to the SJCPHS on November 16, <br /> ` 2001 This letter responds to SJCPHS's requested modifications to the workplan presented as <br /> comments and conditions Rather than recreate the workplan, this letter will serve as an <br /> addendum to the workplan and will supersede the workplan in regards to topics mentioned below <br /> Comments and Conditions <br /> In regards to the construction of new monitor wells, Blaes Environmental will construct one well <br /> at each proposed location (see attached Figure [Attachment 1]) with two, 2-Inch casings Each <br /> casing will have no more than 20 feet of screen The proposed well construction diagram is <br /> included as Attachment 2 <br /> In order to establish a control point between monitor wells MW-4 and MW-7, Blaes <br /> Environmental plans to position proposed well MVV-10 (cluster well) along the property <br /> boundary near the propane tank (Attachment 1) This well will be constructed as shown in <br /> Attachment 2 <br /> Selected soil samples from the borings of the proposed air sparge well, proposed vapor extraction <br /> well, and/or the proposed monitor wells will be additionally analyzed for methanol (using EPA <br /> Method 8015m), ethanol, 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), and Lead <br /> The selection of soil samples for analyses will be based on the depth of previous soil analytical <br /> data indicating elevated hydrocarbon concentrations, soil type, and sample recovery <br /> During quarterly groundwater monitoring, at least one selected groundwater sample per quarter <br /> will be analyzed for methanol, ethanol, 1,2-DCA, EDB, and Lead in addition to the usual <br /> • analyses <br /> 1433 North Third Avenue,Phoenix,Arizona 85003 <br /> Telephone (602)728-0707 Fax (602)728-0708 <br />