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..r <br /> Sampling Protocols <br /> Drilling <br /> A permit will be obtained as necessary for the monitoring wells before drilling <br /> begins. The monitoring well will be accomplished using a mobile mounted drilling <br /> -- rig employing the use of a hollow stem flight auger no less than 6 3/4 inch i.d. and <br /> 10 7/8 inch o.d. <br /> T All drilling equipment will be thoroughly steam-cleaned before drilling begins to <br /> prevent the introduction of contamination from off site and between borings to <br /> prevent cross contamination. <br /> The borings will be logged under the direct supervision of a registered engineering <br /> geologist using the Unifi(A- Soil Classification System. The color, texture, moisture, <br /> plasticity (if applicable), consistency of the twt.h materials, blow counts, ,pertinent <br /> soil or bedrock characteristics, and any evidence of contamination will be noted. <br /> All water-bearing zones and the depths at which they were encountered will be <br /> noted on these logs. <br /> Upon termination, the borings into th,-- saturated zone will be completed as moni- <br /> toring welts and backfilled with concrete grout, after a bentonite seal has been <br /> placed. The boring for the monitoring well will be of a diameter at least six inches <br /> (6") greater than the four inch (4") diameter of the well casing to be used. <br /> The cuttings from the drilling operation will be containerized on-site during drilling <br /> for proper disposition. The proper method. of disposal will be dependent upon <br /> results of laboratory analysis. This disposal will be the responsibility of the client <br /> unless other arrangements have been made. <br /> 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 placed at <br /> the bottom of the boring as necessary. After the seal has been allowed to set long <br /> s enough to support the weight of the casing, a four inch (4") diameter well casing <br /> (PVC) with end cap and factory perforations for placement in the saturated zone <br /> (taldng into account seasonal variation) will be placed in the boring. The screen and <br /> filter pack sizes will be as noted in the well construction drawing. The casing and <br /> end caps will be threaded or joined by stainless steel screws; no PVC cement will <br />