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Mr. Jeff Gymer Draft Post-Remediation Soil Gas Probe Destruction Workplan Former Lodi MGP Site December 17, 2015 Soil gas probes PRSG-1 through PRSG-8 will be destroyed by over-drilling the probe borehole using a direct push drill rig with 4-inch diameter core barrel. The core barrel will be driven to the total depth of the deepest probe. Each probe (Teflon tubing) will then be removed from the borehole. The resulting borehole will be backfilled with neat cement to the ground surface using a tremie pipe. The surface at each probe location will be finished to match the surrounding surface. DECONTAMINATION PROCEDURES All subsurface drilling equipment will be decontaminated prior to initiating drilling at the Site, between each soil gas probe location, and at the completion of the drilling activities. Decontamination of drilling equipment will be completed using a steam cleaner or high pressure wash. INVESTIGATION DERIVED WASTES Derived wastes generated from the activities outlined in this Workplan will include soil cuttings and wash water from decontamination procedures. All waste materials, including probe materials (Teflon tubing, stainless steel screens, valves, well boxes) will be containerized in drums at the Site. Soil cuttings and decontamination water will be placed into separate drums. Soil gas probe materials will be segregated and containerized to the extent possible. The drums will be sealed, appropriately labeled, and stored on-site pending results of the analytical testing. Upon receipt of the analytical laboratory reports, the waste materials will be profiled and transported to an appropriate waste disposal facility. HEALTH AND SAFETY The Site Health and Safety Plan (HASP) will be followed during the probe destruction activities. The HASP provides information regarding anticipated Site health and safety issues and establishes policies and procedures adequate to protect Site workers from potential Site hazards. The HASP includes specific information about the hazards associated with probe destruction activities. This information includes chemicals of concern, action levels, personal protective equipment, emergency procedures, directions to the nearest hospital, and a list of emergency telephone numbers. REPORTING The soil gas probe destruction activities will be documented in a destruction letter report. In addition, California Department of Water Resources well completion reports will be prepared and submitted for each destroyed soil gas probe. TERRA PACIFIC GROUP Page 3