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* f <br /> Wright f <br /> Environmental <br /> Services, Inc. <br /> 2395 East Pescadero Avenue <br /> Tracy, CA 95304 <br /> August l4,2009(rev.Oct S,2009) <br /> Project No.4090-P <br /> i <br /> Cox and Cox <br /> Attn:Mr.Dennis Cox <br /> 22862 North Tuolumne Road <br /> Twain Harte;CA 95383-9754 <br /> i <br /> Re:, Destruction of Monitoring Wells <br /> Site at 595 East I lth Street,Tracy,CA;Site Code 1933; Global ID T0607700373 <br /> I <br /> Dear Mr. Cox, <br /> Wright Environmental Services, Inc. (Wright) has prepared this letter report for the destruction of all <br /> monitoring wells for the above referenced site. This work is part of the No Further Action Report <br /> (NFAR) process for this site. The San Joaquin County Environmental Health Department (SJCIEHD) <br /> requested this letter documenting the well destructions. <br /> 1.0 Scope of Work <br /> The tcchnical approach to this project was to destroy all monitoring wells at the site under approved <br /> SJC/EHD permit SR 05777 dated July 14,2009(see attached well destruction permit and Figure 1). The <br /> monitoring wells were destroyed on July 23 and 24, 2009 and a SJC/EHD representative observed and <br /> approved each well destruction depth,the cement grout seal mix and observed the borehole seal. <br /> 2.0 Field Methods—Well Destructions <br /> Monitoring wells MW-1, MW-2, MW3R, MW-4, MW-5, MW-6, MW-7, MW-8 and MW-9R were <br /> destroyed using an approved method summarized as follows: The depth to groundwater and total depth <br /> of each well was measured prior to destruction and compared to each well boring logand well <br /> construction detail. The depth of destruction was selected(one foot below the completed depth shown on <br /> each log) and the well casing was completely removed. The cement grout was mixed to the SJCEHD <br /> permit specification and then placed in the borehole using a tremie pipe,filling from the bottom to top of <br /> each borehole(to the existing surface grade). <br /> Soil samples of well destruction materials were collected on July 24, 2009 for chemical testing. The <br /> samples were collected in pre-cleaned brass tubes driven into the soil completely filling each tube. Each <br /> sample was then sealed with foil and endcaps,labeled,logged onto chain-of-custody forms and shipped to <br /> the laboratory in a chilled ice chest on crushed ice. <br /> Page/of <br />