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Geological Audit Services, Inc. <br /> Environmental Professionals <br /> V <br /> ow 1803 March Lane, Suite A•Stockton,CA 95207-6414•(209)956-0264•Fax(209)956-0700 <br /> July 5, 1994 <br /> SC-94-05-968-02 <br /> Ms. l,. T. Briggs <br /> San Joaquin County PHS/EHD <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> .Subject: Work Plan Addendum <br /> Production Chemical Manufacturing <br /> 1000 East Channel Street, Stockton, California <br /> Dear Ms. Briggs: <br /> Pursuant to our conversation on June 23, 1994, we are providing the following additional <br /> information as an addendum to the "Work Plan for UST Closure In Place" for the <br /> referenced site: <br /> • Two soil samples will be collected from beneath the UST piping. One sample will <br /> be collected near the retaining wall, near the south portion of the site; a second <br /> sample will be collected near the former dispenser. -_- <br /> • Underground Service Alert (UST) was notified on June 30, 1994 (#207259). <br /> • The precise age of the UST could not be determined. Therefore, a minimum of two <br /> soil samples from beneath the tank will be analyzed for total lead in accordance with <br /> approved EPA methods. Samples from beneath the piping will also be analyzed for <br /> total lead. <br /> • The cement to slurry fill the UST and piping for abandonment will follow the mix <br /> design provided to Production Chemical Manufacturing by E. F. Mitchler Co. <br /> (attached). <br /> • A piping tracking and disposition record will be completed and submitted to the <br /> PHS/EHD if the piping is excavated and disposed at a licensed facility. <br /> rcx�P.ee..e..✓rb• <br /> Full Spectrum Environmental Services• Hydrogeology <br />