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6.2 Permitting 6.2.1 Monitoring Well Permits Monitoring well permits will be obtained from the San Joaquin County Environmental Health Department(EHD). Rubik will notify the EHD and RWQCB at least 48 hours prior to the field work. 6.2.2 Notice of Intent for Injections Upon approval of this work plan, a Notice of Intent (NOI) will be submitted in accordance with RWQCB General Waste Discharge Requirements(WDR)Order No. R5-2015-0012.The RWQCB indicated no bench scale testing will required because the injectants have been used elsewhere in California for the same purpose. Additionally, the injectants are approved in the California RWQCB — Los Angeles Region Waste Discharge Requirements for In-Situ Groundwater Remediation (Order No. R4-2014-0187). 6.3 Health and Safety Plan A site-specific Health and Safety Plan (HASP) will be reviewed and signed by all field personnel, including subcontractors, prior to work initiation. The HASP will identify potential health and safety hazards for each phase of site work and include requirements and procedures for protection. The HASP will be maintained onsite during the field activities. 6.4 Utility Clearance Underground Service Alert(USA)will be notified a minimum of 48 hours in advance of subsurface activities to identify underground utilities. A private utility locator will also perform a geophysical survey in the vicinity of each well and injection location to identify potential utilities or other subsurface obstructions. If facility personnel, data from previous borings, and/or the utility clearance contractor are unable to verify a location is utility free, a hand auger will be advanced to approximately 5 feet bgs prior to drilling to manually clear the location. 6.5 Monitoring Well Installation The proposed monitoring well locations are depicted on Figure 8. The wells will be installed using a truck-mounted hollow stem auger drilling rig. During drilling, soil cores will be collected continuously and logged in the field using the Unified Soil Classification System (USCS). The monitoring wells are anticipated to be screened between 45 and 65 feet bgs to be consistent with the surrounding A-zone wells. After reaching the maximum extent of drilling,the conductor casing will be removed in stages as the annular space is backfilled with the well construction materials. The monitoring wells will be constructed of 2-inch diameter Schedule 40 polyvinyl chloride (PVC) casing with 20 feet of 0.010-inch slotted screen. The annular space between the borehole wall and the well screen will be back-filled with a silica sand filter pack to approximately 2 feet above the top of the well screen. A 2-foot thick hydrated bentonite pellet seal will be installed above the filter pack. A neat cement sanitary seal will extend from the top of the bentonite seal to approximately 1 feet bgs. CPS Stockton, California 5 j� Pilot Test Work Plan D6LI&