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Focused Groundwater Investigation Work Plan Deuel Vocational Institution(DVI), Tracy, California Sampling and Analysis be allowed to hydrate for approximately 30 minutes. Bentonite slurry will be used from the seal to approximately 2 feet bgs. 4.4.2 Well Development Well development will begin no sooner than 48 hours after construction is complete. The development method will be bailing and swabbing followed by pumping.A sand bailer will remove fine-grained sediments and sand from the well until less than 1 teaspoon per load is collected in the bailer.A surge block will gently swab the well to increase flow from the formation into the well. Bailing and surging will repeat at least three times and until sediment is less than 1 teaspoon per load before pumping begins. Using a submersible pump,the well will be pumped until water is visually absent of sediments and the following field parameters are stabilized: temperature, conductivity,pH, and turbidity. 4.4.3 Surveying The wells will be surveyed using a licensed surveyor following installation. The top-of-casing elevation will be measured for each newly installed MW. Horizontal coordinates will be determined to the closest 1.0 foot and referenced to State Plan Coordinate System,Zone 3,North American Datum of 1983. Ground surface and top-of-casing elevations will be measured to the closest 0.1 foot and 0.01 foot, respectively. These elevations will be referenced to the National Geodetic Vertical Datum of 1988. Coordinates will be uploaded to the State Water Resources Control Board's GeoTracker online database. 4.5 Decontamination Procedures All workers will wash their hands thoroughly with soap and water before eating and when exiting the work zone. They will clean-up the project site and all site equipment and then will wash their hands and faces thoroughly when work activities are completed. Site personnel may become contaminated during the course of field activities by: • contacting airborne vapors,gases,mists, or particulates; • coming in contact with splashed materials or walking through puddles; • handling contaminated soil and equipment; • sitting or kneeling on contaminated soil or liquids; and/or • using contaminated instruments or equipment. Although PPE and good work practices will protect field personnel from direct contact and reduce the contamination of PPE, instruments, and equipment, contamination cannot be avoided completely. Contaminants can be transferred to clean areas and off-site,potentially exposing unprotected field personnel and the public. To prevent such occurrences, general and site-specific safety rules,training, and decontamination procedures will be implemented at the project site. General cleaning requirements for field instruments (e.g.,tapes,meters)will include, at a minimum, wiping down the equipment body,probes, and cables with detergent solution and rinsing thoroughly with tap water. Re-usable equipment will be decontaminated either by steam cleaning or by washing, or by a series of washings,using an industrial detergent and water solution, followed by a series of rinsings using generous amounts of water. To avoid cross-contaminating re-usable sampling equipment,using a decontamination solution rinse may be necessary, followed by a series of potable water rinses and a final de-ionized water rinse. The rinse water will be collected in clean containers for appropriate disposal. 4-3