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1.0 MONITORING WELL INSTALLATION 1.1 General Information • Purpose of the monitoring well installation: conducted on behalf of Cove Contractors, Inc. to meet the request for reinstallation of the closed well MW-7 by Ms. Mary Boyd of the Central Valley Regional Water Quality Control Board (RWQCB). • The site vicinity map is illustrated in Figure 1. • The groundwater monitoring well was installed at the North West corner of the landfill boundary. The well was located in the vicinity of the existing closed well MW-7 and was renamed MW-7A. A copy of the installation permit issued by the San Joaquin County Environmental Health Department is provided in Appendix A. • In addition, a scaled map of the facility site features, including the existing wells, and newly installed MW-7A, is illustrated in Figure 2. • Based on the historic northeasterly groundwater flow direction MW-7A will be considered a corrective action monitoring point. 1.2 Drilling Details • EarthCon provided oversight of the drilling and well installation activities on September 28, 2015. • Jeremy Neff of Gregg Drilling, Inc., from Martinez, California, installed monitoring well MW-7A by using a hollow stem auger drill rig. • A clean auger was utilized in MW-7A and decontamination procedures were conducted in accordance with Gregg Drilling, Inc's standard operating procedures. • Boring logs, documenting soil lithology from a continuous core, were completed by a field geologist. The Unified Soil Classification System was utilized to describe the soil lithology during installation as illustrated on the well construction diagrams provided in Appendix B. • Investigation Derived Wastes(IDW)included soil cuttings,decontamination water, and produced water from the development of the groundwater monitoring well. IDW was containerized; separating solids from liquids, in DOT approved 55-gallon drums. The solids drums were temporarily stored on-Site until they were added to a 20-yard bin of soil cuttings generated from drilling into the landfill, characterized, and will be transported off-Site for disposal based on the analytical results. Purge water from development was captured in a 500 gallon container and process through the on-Site treatment system. Cove Contractors is responsible for the IDW management and proper disposal. 1.3 Well Development • Well development was conducted on October 1, 2015 MW-7A Install Report Stockton,CA Cove Contractors 1 Project No.04.20090407.00