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•� <br /> i <br /> t <br /> f <br /> ROYAL, OAK SAVINGS& LOAN <br /> Extended Ground Water Investigation <br /> Page 3 <br /> 3.1 Drilling <br /> A permit will be obtained as necessary for the well before drilling begins. The <br /> monitoring well will be accomplished using a mobile mounted drilling rig <br /> employing the use of a hollow stem flight augcr no less than 3-114 inch i.d. and <br /> six inch (6") o.d. <br /> All drilling equipment will be thoroughly steam cleaned before drilling begins to <br /> prevent the introduction of contamination from off site. <br /> The well will be logged (Figure 3) under the direct supervision of a registered <br /> engineering geologist using the United Soil Classification System. The color, <br /> texture, moisture, plasticity (if applicable), consistency of the earth materials, <br /> blow counts, pertinent soil or bedrock characteristics, and any evidence of con- <br /> tamination will be noted. The water-bearing zone and the depth at which it was <br /> encountered will be noted oil this log. <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 <br /> the client unless other arrangements have been made. <br /> 3.2 Well Construction <br /> All materials used in well construction will be thoroughly cleaned prior to intro- <br /> duction 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 two inch (2") diameter <br /> well casing (stainless steel or PVC) with end cap and factory perforations for <br /> placement in the saturated zone (taking into account seasonal variation) will be <br /> placed in the boring. The screen and filter pack sizes will be as noted in the well <br /> construction drawing. The casing and end caps will be threaded or joined by <br /> stainless steel screws, no PVC cement will be used. The filter pack will extend <br /> two feet (2') above the perforated zone. A bentonite seal two to three feet (2" - <br /> 3") will be placed in the annular space above the filter pack followed by a <br /> cement grout to the surface. Seal and filter pack elevations may change based on <br /> ' the underlying geology (Figure 4). <br />