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For most wells Table 1 can be used to calculate the casing volume of water in the well <br /> Casing Volume- Water Depth (ft) X Volume Factor <br /> TABLE 1 <br /> ' CASING I.D. VOLUME FACTOR <br /> al /finer foot <br /> 2 inch 0 16 <br /> 3 inch 037 <br /> 3 5 inch 050 <br /> 4 inch 065 <br /> 4 25 inch 074 <br /> 4 5 inch 083 <br /> 6 inch 147 <br /> 8 inch 261 <br /> ' 10 inch 408 <br /> • The purged water will be periodically tested for pH, temperature, turbidity, conductivity, or <br /> other parameters as deemed necessary by the site geologist/hydrologist All testing <br /> t instruments will be calibrated prior to use All instrument probes/sensors will be thoroughly <br /> cleaned and rinsed with deionized water before and between samples All data will be <br /> recorded on well sampling forms <br /> 1 Purged wells will be immediately sampled, once the wells have been purged as described <br /> above and the field water parameter tests have stabilized Stabilization will be considered <br /> ' reached when two consecutive pH, temperature, and conductivity readings do not vary more <br /> than 20%, indicating that formation water has been reached Wells that are purged dry will be <br /> sampled after they are approximately 80% recovered, or after 24 hours, whichever comes <br /> ' first <br /> • Plastic, vinyl or Nitrile gloves will be worn during sampling and changed between samples <br /> ' Water samples will normally 1 <br /> • p y be collected with disposable bailers Normally, two samples will <br /> ' be collected from each well, in case additional analytical work is required later The samples <br /> will be carefully handled to prevent agitation and subsequent aeration The samples will be <br /> immediately transferred to EPA-approved VOA bottles/vials of appropriate size, and filled <br /> ' completely without headspace Samples for organic analysis are not filtered or chemically <br /> preserved <br /> American Geological Services, Inc. <br />