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FIELD PROCEDURES <br /> FOR <br /> GROUNDWATER MONITORING DEVELOPMENT AND SAMPLING <br /> It <br /> ' Groundwater Monitoring Well Development <br /> The groundwater monitoring wells were developed to consolidate and stabilize the filter pack <br /> ' to optimize well production and reduce the turbidity of subsequent groundwater samples. <br /> Well development was accomplished by using a surge block and disposable bailer to <br /> evacuate the water and sediments before establishing the bentonite seal during well <br /> construction. Development continued until the groundwater was relatively free of sediment. <br /> Well development fluids were placed into Department of Transportation approved drums for <br /> disposal. <br /> ' Groundwater Level Measurement <br /> Before groundwater sampling, the water level in each well was measured from the <br /> ' permanent survey reference point on top of the well casing. Groundwater in each well was <br /> monitored for free-floating product or sheen. The depth to groundwater was measured to an <br /> accuracy of 0.01 foot from the top of the polyvinyl chloride well casing using an electronic <br /> ' sounder. <br /> Groundwater Monitoring Well Sampling <br /> To ensure that the groundwater sample was representative of the aquifer, the wells were <br /> purged of 3 casing volumes before sample collection. Purging was accomplished using a <br /> PUMP <br /> The groundwater samples were collected using a disposable bailer, and carefully transferred <br /> ' into laboratory-supplied containers. The sampling technician wore nitrile gloves at all times <br /> during purging and well sampling. The samples were clearly labeled with well number, site <br /> identification, date and time of collection, and sampler's initials, and transported in an iced <br /> ' cooler to a state-certified laboratory following proper preservation and chain of custody <br /> protocol. <br /> 1 <br />