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5.5 Injection Solution The injection solution will be mixed with potable water from an offsite source in accordance with the manufacturer's specifications. Based on the manufacturer's recommendations, a solution of approximately 200 pounds of Newman Zone mixed with approximately 420 gallons of water will be injected into each boring. 5.5.1 Decontamination and Waste Management Down-hole drilling equipment will be decontaminated prior to drilling each well using high- pressure cleaning equipment. The decontamination rinsate and soil cuttings generated during drilling will be placed by waste stream into separate 55-gallon drums. The drums will be labeled, dated, and staged onsite prior to characterization and disposal at an appropriate off-site facility. 6.0 GROUNDWATER MONITORING AND SAMPLING PROGRAM 6.1 Schedule and Frequency Baseline groundwater samples will be collected from the well network prior to the injection event. Post-injection samples will be collected monthly for six months and then quarterly for another year, after which a Pilot Test Evaluation Report will be developed and submitted to the RWQCB. The pilot test analytical parameters will then be incorporated into the exiting semi-annual Monitoring and Reporting Program (MRP) for up to another year. 6.2 Groundwater Sampling and Analysis The depth to water and total well depth will be gauged in the wells prior to purging and sampling. The wells will be purged and sampled in accordance with the low flow protocols (Environmental Protection Agency [EPA], 2017). Water quality parameter measurements will be collected periodically during purging and recorded on field sheets. After the parameters stabilize, the low- flow pump and dedicated tubing will be used to collect the sample from a discrete point within the saturated screened interval of the well into laboratory-supplied containers. The groundwater samples will be immediately labeled, sealed in a plastic bag, logged on the Chain of Custody, transferred to a cooler maintained at approximately 4°Celsius, submitted to the laboratory, and analyzed for the COCs and pilot test parameters shown on Table 4. 7.0 SCHEDULING AND REPORTING Field activities will be initiated after receiving the RWQCB's authorization to proceed and obtaining the boring permits. A Pilot Test Implementation Report will be submitted after completing the field activities. The report will contain: • Descriptions of the boring installation methods; • Description of injection methods and volumes; • Well sampling field logs; • Figures depicting well locations and groundwater analytical data; and • Laboratory analytical reports. Nutrien Vernalis, California 5 7ut)1f2 / / Pilot Test Work Plan