ARCHIVED REPORTS_XR0008606 CASE 1

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i APPENDIX E WELL DEVELOPMENT AND SAMPLING PROCEDURES, AND FIELD SURVEY FORMS Development All development, purging, and ground water sampling equipment was cleaned prior to use to minimize cross-contamination between wells. All equipment in contact with ground water was triple-rinsed prior to each sampling event in successive baths consisting of an Alconox solution, tap water, and deionized water Recovery wells were developed by removing 10 casing volumes and surged in accordance with RWQCB protocol. All wells were inspected for the presence of free product using an electronic interface probe prior to purging. The purged water was pumped into barrels prior to disposal or recycling at an appropriate waste disposal facility Sampling Prior to sampling, monitoring wells were purged of 3 to 4 casing volumes and pH, temperature, and electroconductivity parameters stabilized. Ground water samples were . collected by lowering a 2-inch-diameter, bottom-fill, disposable polyethylene bailer lust below the au/water interface in the well The samples were carefully transferred from the bailer to zero-headspace, 40-milliliter and 1-Mer glass containers fitted with Teflon-sealed caps. All 40-milliliter samples were inverted to ensure that entrapped air was not present Each sample was labeled with sample number, well number, sample date, and geologist's initials. The samples remained on ice prior to and during transport to a Califorma-certified laboratory for analysis The samples were handled in accordance with proper chain of custody documentation.