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• <br /> : <br /> 03 DEC 15 PM 26 2870 Gateway Oaks Drive <br /> Sacramento,CA 95833 <br /> Tel:916.679.2000 <br /> Fax:916.929.7263 <br /> December 12, 2003 <br /> Mr. Robert McClellon <br /> Supervisor R.E.H.S. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202-2708 <br /> Subject: Addendum to the Work Plan to Install Gas Migration Monitoring Probes <br /> World Enterprises Site <br /> Stockton,California <br /> Dear Mr.McClellon: <br /> URS has prepared this addendum to the work plan (addendum) on behalf of RadioShack to install and <br /> monitor the gas migration monitoring probes at the World Enterprises site in Stockton, California. This <br /> addendum was prepared to address San Joaquin County Environmental Health Department's (SJCEHD) <br /> work plan review comments. This addendum was prepared based on our understanding of SJCEHD <br /> requirements following our discussions with Mr. Ted Tasiopoulos of your office. Portions of the work <br /> plan not affected by this addendum will be followed. <br /> BACKGROUND <br /> URS prepared a work plan dated November 7, 2003 for the World Enterprises site located in Stockton, <br /> California(Figure 1) to address SJCEHD concerns identified in the Closed Site Inspection Report dated <br /> July 17, 2003 and in your letter to Tandy Corporation (currently known as RadioShack)dated September <br /> 18, 2003. Following the submittal of the work plan, several discussions with Mr. Tasiopoulos were <br /> completed. Based on these discussions with Mr. Tasiopoulos, it is our understanding that SJCEHD <br /> would like a minimum of 5 feet of seal at the top of the probes, to use pea gravel rather than sand, and <br /> complete the top of the probes within a stove pipe/monument (3 feet above the ground surface) rather <br /> than within a Christy Box (surface completion). <br /> The November 7, 2003 work plan was prepared to meet SJCEHD requirement for the screened interval <br /> of the probes to correspond to the same depth interval (from 15 feet below the ground surface [bgs] to 5 <br /> feet bgs) of the debris. To meet this requirement, it was initially proposed in the November 7, 2003 <br /> KAWprocess\25532\I21203.doc <br />