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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 Approximately 10 times the volume of water in the casing will be withdrawn, if possible.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 the 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 All withdrawn groundwater will be stored on-site in covered 55 gallon waste drums, unless permission is granted by the appropriate regulatory agencies to discharge the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 mDnitorings 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 Approximately four times the volume of water in the well casing will be withdrawn by pumping or hand bailing immediately prior to sampling. If the aquifer is slow to recharge, a smaller amount of groundwater will be withdrawn in order to leave a sufficient volume of water in the well to sample.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.