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WaterWork Groundwater Sampling Protocol Groundwater monitoring wells will be developed within 48 hours of completion. Approximately 10 times the volume of water in the casing will be withdrawn, if possible . If t:Ze aquifer is slow to recharge, development will continue until recharge is too slow to practically continue . All withdrawn groundwater will be stored on-site in covered 55 gallon waste drums, unless permission is granted by the appropriate regulatory agencies to discharge the pumped groundwater to the ground surface . Prior to arriving at the site, all sampling equipment will be washed with laboratory grade detergent, and rinsed twice with tap water and once with deionized water . The sample washing procedure will be carried out on-site before sampling other monitoring wells in cases where more than one monitoring well is to be sampled . Immediately prior to sampling, the depth to water (DTW) level in the well will be recorded . The thickness of product on top of the groundwater, if present, will be measured using an interface probe . The procedure for conducting these monitorings are presented in the Groundwater Monitoring Protocol attachment . Approximately four times the volume of water in the well casing will be withdrawn by pumping or hand bailing immediately prior to sampling . If the aquifer is slow to recharge, a smaller amount of groundwater will be withdrawn in order to leave a sufficient volume of water in the well to sample . The groundwater sample will be collected by lowering a Teflon sampler into the monitoring well and immediately transferring the sample into a 40 ml volatile organic analysis (VOA) container . The sample container will be filled completely so that no head space remains in the container . Duplicate samples will be collected from each well sampled . Immediately following sample collection, the samples will be labeled and stored in an ice chest containing "blue ice" . The labels will contain the following information: date, time, project ID, sample ID, name of sampler and type of analysis . All samples will be transported under chain of custody protocol to a state certified laboratory. To reduce the potential of cross-contamination, the wells will be sampled in order of increasing contamination based on previous laboratory analysis, if available, or by field evidence of visual/olfactory indications of contamination . In addition, latex gloves worn by the sampler and the nylon cord used to lower the teflon sampler will be replaced between each well sampling .