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Geosyntec'-' <br /> consultants <br /> 4.2 Task Descriptions <br /> Task Hazard Analyses (THAs) associated with these tasks are presented in Appendix B. <br /> Task 1: Treatment System O&M <br /> An O&M contractor and Geosyntec personnel will perform regular system O&M. System O&M <br /> includes but is not limited to GAC Vessel sampling, system bag filter changeouts, conveyance <br /> piping clean-outs, and infrastructure repair. <br /> Task 2: Civil/Mechanical+ Electrical Construction <br /> Presidio Systems Inc. (PSI) has been contracted by Geosyntec for performing construction. The <br /> scope of work includes piping and electrical upgrades of the current extraction and injection <br /> system with limited heavy equipment operation. Geosyntec will oversee the construction <br /> activities. <br /> Task 3:Drilling+ Well Development <br /> Sonic and hollow stem auger and direct push drilling methods may be employed to install wells. <br /> Grab groundwater samples will be collected from the deepest boring in each location in 10 foot <br /> intervals using a bailer,check valve on tubing through temporary well screen, or hydropunch <br /> installed in advance of the rotosonic drill casing and sampler. Following installation, the wells <br /> will be developed. A Geosyntec representative will supervise the drilling activities. <br /> Well redevelopment of existing injection and extraction wells will be conducted by Confluence <br /> Environmental, Inc. (Confluence). Each well will be jetted with potable water and redeveloped <br /> using a pump and surge method. The integrity of the well screen and condition of the well casing <br /> will be documented using a down-well video camera inspection. Additional mechanical <br /> treatment including wire-brushing and additional jetting may be employed if the camera <br /> inspection indicates significant sediment or scaling issues. Purge water generated during well <br /> development activities will be temporarily stored on-Site in frac tanks and processed through the <br /> treatment system. <br /> Task 4:ISCO Infections <br /> ISCO injections will be performed by Gregg Drilling, LLC. (Gregg). A direct-push drill rig will <br /> be used to advance an injection tool with a screened interval to the target aquifer intervals at each <br /> injection location. An injection trailer equipped with flow and pressure instrumentation will be <br /> used to deliver the KMn04 solution. The location of the injection points and actual volume of <br /> KMn04 solution delivered at each injection point may vary based on field conditions during <br /> implementation. <br /> Task S: SVE O&M <br /> A temporary, mobile SVE system is mobilized to the Site on the northern parking lot. Due to Site <br /> access constraints and to limit the impact of SVE operations on Site tenants, the SVE system is <br /> SAC 111 HASP-June 2023 6 6/23/2023 <br />