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