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WELL DEVELOPMENT AND SAMPLING PROCEDURES, <br /> AND FIELD SURVEY FORMS <br /> All development, purging, and ground water sampling equipment is cleaned prior to use to <br /> minimize cross-contamination between wells. All equipment in contact with ground water will <br /> be triple-rinsed prior to each sampling event ,in successive baths consisting of an Alconox <br /> solution, and two baths of tap water.; Monitoring wells will be initially developed by surge <br /> block and removing as many as 10 casing volumes. All wells will be inspected for the presence <br /> of free product using an electronic interface probe prior to purging. During purging, pH, <br /> temperature, and electroconductivity are measured periodically until these parameters stabilize, <br /> indicating that formation water has entered the well casing. Purged water will be pumped into <br /> barrels prior to disposal or recycling at an appropriate waste disposal facility. <br /> Prior to sampling, monitoring wells will be purged of as many as 4 casing volumes, or until pH, <br /> temperature, and electroconductivity !parameters stabilized. Ground water samples will be <br /> collected by lowering a disposable 2-inch-diameter, bottom-fill, polyethylene bailer just below <br /> the water level in the well. The samples will be carefully transferred from the <br /> check-valve-equipped bailer to zero-headspace, 40-milliliter glass containers fitted with <br /> Teflon-sealed caps and 1-liter amber glass containers fitted with Teflon-sealed caps. All <br /> 40-milliliter samples are inverted to ensure that'entrapped air is not present. Each sample will <br /> be labeled with sample number, well number, sample date, and sampler's initials. The samples <br /> will remain on ice prior to and during.,transport to a California-certified laboratory for analysis <br /> in accordance with proper chain of custody documentation. <br /> 6 <br />