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k%J KLEINFELDER <br /> Sampling will be conducted immediately following development with a pump <br /> or Teflon bailer. During the purging of the wells, field parameters (pH, <br /> conductivity, temperature) will be monitored. Samples will be collected <br /> after the field parameters have stabilized, normally requiring three to <br /> five well purge volumes. If the wells are incapable of yielding at least <br /> three well volumes, the wells will be evacuated to dryness once, allowed <br /> to recover, and then sampled. After collecting a sample, the sample <br /> bottles will be immediately sealed and placed in an ice chest. At the end <br /> of the field day, the water samples will be delivered to Agriculture and <br /> Priority Pollutants Laboratory, Inc. , (APPL) of Fresno, California. <br /> To minimize the potential for cross-contamination, all development and <br /> sampling equipment will be steam-cleaned prior to its use in each <br /> monitoring well. Additionally, a trisodium phosphate solution followed by <br /> a clean water rinse will be pimped through the sampling equipment prior to <br /> the collection of subsequent water samples. <br /> 3.2.2 Limitations <br /> If subsurface conditions exist which prevent or impede the progress of <br /> boring with a 6 or 8-inch hollow stem auger, a more appropriate means of <br /> receiving subsurface samples will necessarily be employed. Buried river <br /> channel deposits are pion in a regional setting and have posed a problem <br /> in sites within 2 miles of the subject site. Attempts to relocate borings <br /> will be made before alternative drilling methods are considered. <br /> 45-88-01 10 <br />