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• Working to Restore Nature FIELD PROTOCOL The following presents RESNA Industries' (RESNA's) protocol for a typical quarterly groundwater monitoring program at a site involving gasoline hydrocarbon-impacted soil and/or groundwater Site Safety Plan The Site Safety Plan describes the safety requirements for the evaluation of gasoline hydrocarbons in soil and groundwater at the site The site Safety Plan is applicable to personnel of RESNA and its subcontractors RESNA personnel and subcontractors of RESNA scheduled to perform the work at the site are be briefed on the contents of the Site Safety Plan before work begins A copy of the Site Safety Plan is available for reference by appropriate parties during the work A site Safety Officer is assigned to the project Groundwater Sampling The static water level in each well is measured to the nearest 0 01-foot using a Solinst® electric water-level sounder or oil/water interface probe (if the wells contain floating product) cleaned with Alconox® and water before use in each well The liquid in the ansae wells is examined for visual evidence of hydrocarbons by gently lowering approximately half the length of a Teflon® bailer (cleaned with Alconox® and water) past the air/water interface The sample is then retrieved and inspected for floating product, sheen, emulsion, color, and clarity The thickness of floating product detected is recorded to the nearest 1/8- inch f Wells which do not contain floating product are purged using a submersible pump The pump, cables, and hoses are cleaned with Alconox® and water prior to use in each well The wells are purged until withdrawal is of sufficient duration to result in stabilized pH, temperature, and electrical conductivity of the water, as measured using portable meters calibrated to a standard buffer and conductivity standard If the well becomes dewatered, the water level is allowed to recover to at least 80 percent of the initial water level Prior to the collection of each ground water sample, the Teflon® bailer is cleaned with AlconoxG and rinsed with tap water and deionized water, and the latex gloves worn by the sampler changed Hydrochloric acid is added by the laboratory to the sample vials as a preservative (when applicable). A sample method blank is collected by pouring distilled water into the bailer and then into sample vials A sample of the formation water is then collected from the surface of the water in each of the wells using the Teflon® bailer The water samples are then gently poured into laboratory-cleaned, 40-milliliter (ml) glass vials, 500 ml plastic bottles or 1-liter glass bottles (as required for specific laboratory analysis) and sealed with Teflon®-lined caps, and inspected for air bubbles to check for headspace, which would allow 1