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WHF Environmental Mnsultants, Inc. "NO <br /> Sampling Protocols <br /> Page; 2 <br /> be used. The filter pack will extend two feet (2' above the perforated zone. A <br /> bentonite seal two to three feet (3') thick will be placed in the annular space above <br /> the filter pack followed by a cement grout to the surface. Seat and filum pack <br /> elevations may change based on the underlying gtology. <br /> Well Development and Sampling <br /> The wells will be developed until the well water appears clear of sediment and the <br /> appropriate number of well volumes (based upon the judgment of the responsible <br /> professional) have been evacuated. The water produced during well development <br /> will be containerized and left: on-site in 55-gallon drums or other suitable containers <br /> for disposal as hazardous waste if deemed necessary upon receipt of laboratory <br /> results. Disposal will be the responsibility of the client unless other arrang,.mejits <br /> have been made. <br /> All soil and ground water samples will lie oroperly labeled with date colloJed <br /> project number, sample coordinator, and sample identification. Field records will <br /> document the above information and other significant data sucli as conies of on-sits <br /> personnel, sampling irethods, date and time of sampling, the number of well <br /> volumes removed before sampling, preservatives added (if any), and any filtration <br /> performed on samples. <br /> The samples -will be refrigerated immediately for delivery to the laboratory and will <br /> under no circumstances be opened by anyone other than laboratory personnel. <br /> Chain of Custody records will be maintained at all times. <br /> Soil Sampling <br /> All soil sampling equipment will be thoroughly steam-cleaned before and between. <br /> sampling to prevent cross contamination. Relatively undisturbed soil samples will <br /> be taken at intervals of not more than five feet (5') in order to evaluate the <br /> subsurface materials; however, this sampling interval may be waived in saturated <br /> sands in which sample recovery is not possible. During the use of a rotary rig, <br /> samples will not be taken through the gravel zone but will resume at rive foot (5') <br /> intervals when a hollow stern flight auger drilling rig can be used. <br /> The soil samples will be taken using a California Modified Split Spoon sampler <br /> with brass liners. The samp)er will be driven continuously by a wire-line hammer. <br />