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Wright Environmental Services, Inc. IN 2395 East Pescadero Avenue Tracy,CA 95304 � S August 14,2009 V 4 a Project No. 4090-P Cox and Cox Attn: Mr.Dennis Cox 22862 North Tuolumne Road Twain Harte,CA 95383-9754 Re: Destruction of Monitoring Wells Site at 595 East 11th Street,Tracy, CA; Site Code 1933; Global ID T0607700373 ` I Dear Mr. Cox, , Wright Environmental Services, Inc. (Wright) has prepared this letter report for the destruction of all monitoring wells for the above referenced site. This work is part of the No Further Action Report (NFAR)process for this site. The San Joaquin County Environmental Health Department (SJC/EHD)requested this letter documenting the well destructions. 1.0 Scope of Work 1 The technical approach to this project was to destroy all monitoring wells at the site 'under approved SJC/EHD permit SR 05777 dated July 14, 2009 (see attached well destruction permit and Figure 1). The monitoring wells were destroyed on July 23 and 24, 2009 and a SJC/EHD representative observed and approved each well destruction depth, the cement grout seal mix and observed the borehole seal. 2.0 Field Methods Well Destructions i Monitoring wells MW-1, MW-2, MW3R, MW-4, MW-5, MW-6, MW-7, MW-8 and MW-9R were destroyed using an approved method summarized as follows: The depth to groundwater and total depth of each well was measured prior to destruction and compared to each well boring j log and well construction detail. The depth of destruction was selected (one foot below the completed depth shown on each log) and the well casing was completely removed. The cement grout was mixed to the SJC/EHD permit specification and then placed in the borehole using a tremie pipe,filling from the bottom to top of each borehole (to the existing surface grade), Page J of 2 c 4