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FLUOR DANIEL GTI <br /> wi <br /> 96 JUL ,veg <br /> Ih 8 <br /> July 5, 1996 <br /> Mr. Bob DeNinno <br /> The Southland Corporation <br /> 19033 West Valley Highway, D-104 <br /> Kent,WA 98032 <br /> Subject: Addendum to Work plan for Groundwater Extraction Well Installation <br /> Southland Store No.--2030-4- <br /> 455 <br /> o.-20304455 Grant Line Road <br /> Tracy, California <br /> GTI Project 02070 0231 <br /> Dear Mr. DeNinno: <br /> Fluor Daniel GTI, Inc. (Fluor Daniel GTI) submits this letter as an addendum to the work plan,dated <br /> April 12, 1996, for installation of a groundwater extraction well at the Southland Store No.20304 located at <br /> 455 Grant Line Road in Tracy, California (Figure 1,Attachment 1). The work plan is modified in response <br /> to comments and requests made by Ms.Mary Meays of the San Joaquin County Environmental Health <br /> Department(SJCEHD)during a phone conversation with Jeff Auchterlonie of Fluor Daniel GTI on June 13, <br /> 1996. <br /> The premise of the original work plan,to install a groundwater extraction well in the former tank pit area to <br /> dewater the site and allow soil vapor extraction (SVE)to be used as a remedial solution, remains <br /> unchanged. At the verbal request of SJCEHD,the original scope of work has been expanded to include the <br /> installation of: <br /> I <br /> 1) a second groundwater extraction well approximately 10 feet west of MWA0 (Figure 2, <br /> n <br /> Attachment 1). _. <br /> 2) 1 a fifth vault for potential additional extraction well located 20 feet northwest near MW-8 <br /> 3) lateral soil vapor extraction screen into the extraction fine trench before backfilling. <br /> During the June 13, 1996 phone call,the SJCEHD also requested the remedial process be accelerated by <br /> installation of a low flow bio-sparge system that would be used to inject air into wells MW-9 and MW-10. <br /> Injection of air into wells MW-9 and MWA 0, located 12 feet from the 7-Eleven store, could result in the <br /> vertical migration of petroleum hydrocarbon vapors into the store and possible exposure of store employees <br /> and customers to potentially harmful vapors. At this time, Fluor Daniel GTI does not recommend <br /> installation and operation of the bio-sparge system at the site. <br /> 0231-02.WKP(StN-5.t) <br /> 1401 Halyard Drive, Suite 140 / West Sacramento, CA 95691 USA (916) 372-4700 FAX (916) 372-8781 <br />