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%Now' WELL DESTRUCTION WORK PLAN University Park 1252 North Stanislaus Street Stockton, CA 95202 September 17,2013 1.0 INTRODUCTION This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe the proposed destruction of nine groundwater monitoring wells at the Stockton Developmental Center,University Park, 1252 North Stanislaus Street(site) in Stockton, California(Figures 1 and 2,Appendix A).The purpose of the work is to properly destroy all of the monitoring wells prior to final closure of the site.In a letter dated June 4, 2013, Adrienne Ellsaesser of the San Joaquin County Environmental Health Department (SJCEHD) indicated that the investigation and remediation of the site had been completed and that their agency will request destruction of the monitoring wells that are on the site. In a letter dated June 10, 2013, the Central Valley Water Quality Control Board (CVWQCB) indicated that they concurred with the SJCEHD letter dated June 4, 2013. The preparation of a work plan for destruction of all wells associated with the site is part of the site closure process. Condor prepared this work plan at the request of CSU Contact, Steven Lohr,Chief of Land Use Planning and Environmental Review of the Stockton Center Site Authority(SCSA)in response to the SJCEHD and CVWQCB letters. All work conducted by Condor will be under the supervision of a California Professional Geologist. This work plan includes a description of the field and reporting procedures proposed to conduct the work, and a project schedule. 2.0 SITE PREPARATION A well destruction permit will be obtained from the SJCEHD. Prior to initiating the fieldwork, the well locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in the vicinity of the work area. Prior to commencement of fieldwork, a tailgate safety meeting will be held and a site-specific Health and Safety Plan will be discussed with,and presented to, all field personnel for their signatures. 3.0 DESTRUCTION OF MONITORING WELLS A California C-57 licensed driller will perform the destruction of the monitoring wells in accordance with State of California Department of Water Resources(DWR)and SJCEHD requirements.Because the wells are located in an area of known petroleum hydrocarbon contamination, and all wells except MW-6 and MW-9 have had reportable concentrations of hydrocarbon constituents in the past, the SJCEHD well destruction standards require complete over-drilling of seven of the nine monitoring wells. A Condor Professional Geologist will observe the well destructions. Monitoring well construction details are shown in Table A, Appendix A. Each monitoring well casing will be sounded for water level and total depth prior to destruction. The monitoring wells, with the exception of MW-6 and MW-9, will be destroyed by over-drilling from top to bottom so that all material within the original borehole(including the well casing, screen, filter pack, and annular seal) is removed, and the hole will be filled completely with neat-cement grout slurry. Grout will +'� CONDOR