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PROCEDURE i <br /> Drilling <br /> • The objective of the selected drilling technique is to ensure that the drilling, method <br /> provides representative data while minimizing subsurface contamination, cross <br /> i <br /> contamination of aquifers, and drilling costs. The common drilling methods are hollow- <br /> stem auger and direct-push techniques. <br /> • A Field Geologist or Engineer will be present during all well drilling and installation <br /> activities and will fully document all tasks performed in support of these activities. The <br /> Field Geologist or Engineer will.be responsible for the logging of samples, monitoring, of <br /> drilling operations,recording, of water losses/gains and groundwater data, re arin the <br /> P P g <br /> boring logs and well diagrams, and.recording the well installation procedures of the rig. <br /> The Field Geologist or Engineer will have onsite sufficient equipment in operable I <br /> condition to perform efficiently his/her duties as outlined in the field sampling plan. <br /> • Surface runoff or other fluids will not be allowed to enter any boring or well during or <br /> after drilling/construction. <br /> • An accurate measurement of the water level.will be made upon encountering water in the <br /> borehole and later upon t <br /> po stabilization. Levels will be periodically checked throughout the. <br /> course of drilling. Any unusual change in the water level in the hole such as a sudden <br /> rise of a few inches may indicate artesian pressure in a confined aquifer will be the basis <br /> for cessation of drilling. The geologist will immediately contact-his or her supervisor: <br /> Particular attention for such water-level changes will be given after penetrating any clay <br /> ` or silt bed,regardless of thickness, which has the potential to act as a confining layer. <br /> • If required, drilling will continue 2-foot into the confining clay layer to allow for the <br /> installation of a sump beneath the screened section. <br /> Lithologic Logging <br /> All borings for monitoring wells will'be logged by a geologist. Logs will be.recorded in <br /> a field logbook and/or a boring log. If the information is recorded in a logbook, it will be <br /> transferred to Boring Log Forms on a daily basis. Field notes are to include, as a <br /> minimum: <br /> o Boring Number. <br /> j <br /> • Material Description (as listed below) <br /> • Weather conditions <br /> Page 3 of 9 <br />{ <br /> well install_SOP MONITORING WELL INSTALLATION February 2005 <br /> I <br />