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•j T1 • <br /> Ripona Market <br /> Subsurface Soil & Groundwater Investigation II <br /> Page: 4 <br /> the drilling will be halted until the responsible professional determines the <br /> advisability of deeper drilling <br /> Upon termination, the borings into the saturated zone will be completed as <br /> monitoring wells and backfilled with concrete grout, after a Bentonite seal has <br /> been placed The borings for the monitoring wells will be of a diameter at least 4 <br /> inches greater than the 2 inch diameter of the well casing to be used <br /> The cuttings from the drilling operation will be containerized on-site during <br /> drilling for proper disposition The proper method of disposal will be dependent <br /> upon results of laboratory analysis This disposal will be the responsibility of the <br /> client unless other arrangements are made <br /> 2.2 Well Construction <br /> All materials used in well construction will be thoroughly cleaned prior to <br /> introduction into the boring A Bentonite or cement and Bentonite grout will be <br /> placed at the bottom of the boring as necessary After the seal has been allowed <br /> to set long enough to support the weight of the casing, a 2- inch diameter well <br /> casing (PVC) with end cap and factory perforations for placement in the saturated <br /> zone (taking into account seasonal variation) will be placed in the boring The <br /> screen and filter pack sizes will be as noted in the well construction drawing The <br /> casing and end caps will be threaded or joined by stainless steel screws, no PVC <br /> cement will be used The filter pack will extend two feet above the perforated <br /> zone A Bentonite seal 2- to 3-feet thick will be placed in the annular space above <br /> the filter pack followed by a cement grout to the surface Seal and filter pack <br /> elevations may change based on the underlying geology <br /> 2.3 Well Development and Sampling <br /> The well will be developed until the well water appears clear of sediment, or until <br /> an appropriate number of well volumes (based upon the judgment of the <br /> responsible professional) have been evacuated The water produced during well <br /> development will be contained and disposed of by the driller The wells will be <br /> allowed to stabilize for twenty-four (24) hours prior to sampling <br /> All soil and groundwater samples will be properly labeled with date collected, <br /> project number, sample coordinator, and sample identification Field records will <br /> document the above information and other significant data, such as names of on- <br /> site personnel, sampling methods, date and time of sampling, the number of well <br /> volumes removed before sampling, preservatives added, and any filtration <br /> performed on samples <br />