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0 • <br /> Monitoring Well Installation Work Plan <br /> White Slough Water Pollution Control Facility <br /> 4.4 Equipment Decontamination <br /> Before entering the site, the drilling rig, drilling tools, and equipment will be cleaned. Cleaning <br /> will consist of scraping, brushing, and washing with water until surfaces are visibly free of <br /> soil buildup. All downhole equipment will be decontaminated before site departure and between <br /> each onsite setup (if multiple boreholes are drilled). The following procedures will be used to <br /> decontaminate the downhole drilling equipment until surfaces are visibly free of loose soil: <br /> • Scrape or brush off residue <br /> • Steam rinse <br /> • Air dry <br /> The residual soils generated during onsite decontamination will be placed into 55-gallon drums <br /> and/or open-top soil bins and disposed of in accordance with details in Section 4.5. This same <br /> procedure will be used for the drilling equipment that comes into contact with soil materials <br /> during drilling. <br /> Field instruments will be decontaminated before and after each use. The following procedures <br /> will be used to decontaminate those portions of the field testing instruments (e.g., water level <br /> meter, pH/conductivity/temperature meter) and sampling equipment (purge pumps) that come <br /> into direct contact with groundwater: <br /> • Rinse twice with deionized water <br /> • Air dry <br /> 4.5 Soil Cuttings and Purge Water Disposal <br /> Soil cuttings generated during drilling will be spread on the ground around the well. <br /> Groundwater generated during well development and sampling events will be temporarily stored <br /> and then discharged to the WPCF ponds. <br /> 4.6 Monitoring Well Coordinate Survey <br /> The final monitoring well location will be measured by a licensed surveyor according to the <br /> following specifications: <br /> • Horizontal coordinates measured to the nearest 1.0 foot, referenced to California State <br /> Coordinate System and the North American Datum of 1983 (NAD 83). <br /> • Elevations measured as follows,referenced to the North American Vertical Datum of <br /> 1988 (NAVD 88): <br /> — Elevation at the top of the PVC well casing, measured to the nearest 0.01 feet. <br /> — Elevation at the top of the concrete pad surrounding the well, measured to the <br /> nearest 0.1 feet. <br /> WEST YOST ASSOCIATES 8 City of Lodi <br /> September 2014 Monitoring Well Installation Work Plan <br /> w\c\213\06-14-31\wp\WP\083014_7 RWP <br />