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1 <br /> For most wells Table I can be used to calculate the casing volume of water in the well. <br /> Casing Volume =Water Depth (ft)X Volume Factor <br /> TABLE I <br /> CASING I.D. VOLUME FACTOR <br /> gal./liner foot <br /> ' 2 inch 0.16 <br /> 3 inch 0.37 <br /> 3.5 inch 0.50 <br /> 4 inch 0.65 <br /> 4.25 inch 0.74 <br /> ' 4.5 inch 0.83 <br /> 6 inch 1.47 <br /> 8 inch 2.61 <br /> 10 inch 4.08 <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 /> 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 /> ' 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 <br /> be 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 be collected with disposable bailers. Normally, two samples <br /> ' will be collected from each well, in case additional analytical work is required later. The <br /> samples will be carefully handled to prevent agitation and subsequent aeration. The samples <br /> will be immediately transferred to EPA-approved VOA bottles/vials of appropriate size, and <br /> x' <br /> Y 1 r <br /> American Geological Services, Inc. <br /> ' 5 <br />