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CeologicaC Techlucs 11tc., 1172 Kansas Avenue Modesto,California 95351 (209)522-4119/Fax(209)522-4227 www.gtienv.com December 10, 2012 Project No. 723.2 Project Name: Valentine(El Drado) Mr. Stephen Valentine 201 Marc Ave Stockton,CA 95207 ` Re: Work Plan: Well Destruction Location: 2315 N. El Dorado Street;Stockton,CA Dear Mr.Valentine: As requested in a December 5,'2012 email from Mr. Harlin Knoll of San Joaquin County 3 Environmental Health Department, enclosed is a work plan for destruction of the monitoring wells at the site as noted above. Prior to the site receiving regulatory agency closure, all of the wells installed at the site will have to be destroyed in accordance with the California Well 4 Standards. We have prepared the work plan below for the abandonment (destruction) of eight monitoring wells, three CMT multi-chamber monitoring wells, two vapor extraction wells (VEW) and two extraction wells (EW)to start the site closure process. (See Figure 2 for well _ locations). Well Abandonment The wells proposed for destruction are listed in the attached tables along with the relevant grout volume calculations for the well casing plus filter pack and horizontal piping. The wells will be destroyed by either complete drill out or for a few of them we will use pressure grouting methods. Refer to Figure 2 for well locations. A traffic Control plan will be presented during the permitting process. This plan will be implemented prior to commencement of well closure activities. Well drill out will be conducted using V&W's BK-81 drill rig, using a stinger mounted to the bottom of the hollow stem user drill rods. -V&W'has developed a successful drill out method that we will use on the three CMT wells(CMT77, -8 & -9). The pressure grouting process will be conducted as follows: //