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n <br /> Harding ESE, Inc <br /> 10265 Rockingham Drive <br /> 50 <br /> Harding ESE Suite <br /> Sacramento CA 95827 <br /> A MACTEC COMPANY Telephone 916364 3 <br /> Fax 9161/364-5635633 <br /> Home Page www mactec com <br /> June 12,2001 <br /> 52822 1 r r D <br /> Michael J Infurna, Senior REHS <br /> San Joaquin County Public Health Services JEAN <br /> Environmental Health Division <br /> 304 East Weber EI�VI�I)�;yiEi�f 1 iEALl H <br /> Stockton, California 95202 PERIOMSERVICES <br /> Well Destruction <br /> Completed Supplemental Site Investigation (SSI) <br /> Tri Valley Growers Plant T n ,, <br /> 26200 Nowell Road , AXA 7-4i araa <br /> Thornton, California <br /> Site Code 1920 <br /> Dear Mr Infurna <br /> iOn behalf of Tri Valley Growers (TVG), Harding ESE Inc (Harding ESE) (Formerly Harding Lawson <br /> Associates (HLA)) submits to the San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD)this report documenting the destruction of seven monitoring wells associated with two <br /> former underground storage tanks(USTs) located at the above referenced facility(Site) The Site is located <br /> at 26200 Nowell Road in Thornton, California(Plates 1 and 2) (Site) This work was requested in a February <br /> 9, 2001 PHS/EHD letter to TVG, which indicated that the seven wells must be destroyed, and all investigation <br /> derived waste removed from the Site, prior to issuance of the site closure letter <br /> BACKGROUND <br /> Since 1987 several phases of investigation including installation of six monitoring wells, ten soil borings, and <br /> three hand auger borings by other consultants In 1998,and 1999 HLA performed a Supplemental Site <br /> Investigation (SSI)that included advancing three soil borings and obtaining depth specific hydropunch grab <br /> groundwater sampling and subsequently the installation of one deep monitoring well (MW-7) The results of <br /> these investigations were summarized in the report entitled Closure Report(HLA, 1999) Monitoring well <br /> locations are shown,on Plate 3 <br /> WELL DESTRUCTION <br /> Destruction of the welts was performed in accordance with the requirements of San Joaquin County Well <br /> Standards (Section 13 17 6, 12, and 13)and the State of California Well Standards Bulletins 74-81 and 74- <br /> 90 (California Department of Water Resources, 1981 and 1991) Michael Infurna of the PHS/EHD was <br /> onsite to observe the destruction activity A copy of the well destruction permit is attached On March 2, <br /> 2001, the on-site monitoring wells were destroyed by the following procedures <br />