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Section No 6 . <br /> Revision No 1 <br /> Date* January 13, 1992 <br /> Page 28 of 55 <br /> thoroughly steam-cleaned followed by a triple distilled water rinse All <br /> decontamination procedures will be documented in the Daily Report Form <br /> All drilling and sampling tasks will be completed under the supervision <br /> of a MARK geologist/hydrogeologist, who in turn is supervised by a Certified <br /> -Engineering Geologist -Lithologic logs will be prepared and submitted using <br /> the Unified Soil Classification System for soils and unconsolidated materials <br /> and in accordance with ASTM D 2487-83 The appropriate soil descriptions, <br /> stratigraphic changes, -geologic- notation, sampling intervals, recoveries, - <br /> blow counts, drilling conditions, groundwater levels and other pertinent data <br /> will be recorded on the field logs All borings not completed as monitoring <br /> wells will be backfilled with cement or cement/bentonite mixture to grade, <br /> according to county well sealing standards Drill cuttings and other <br /> _mate rials_generated_duringTcamp 1-ing_act�iv3.t1es--wi_1-1-be -collected,---stored, - ------ <br /> tested, and disposed of in accordance with applicable state and federal <br /> regulations, as described in the sampling and analysis plan <br /> 6 5 1 Hollow-Stem Auger Drilling <br /> Hollow-stem auger drilling methods will be implemented to collect <br /> representative undisturbed soil samples from depths less than 70 to 80 feet <br /> below land surface This method is generally preferred since the boreholes <br /> are advanced without the addition of drilling fluids and the augers are left <br /> in place during sampling which prevents the caving of the borehole and <br /> downhole slough from the overlying zones To obtain samples from depths <br /> greater than 70 to 80 feet, rotary-wash drilling methods (described in <br /> Section 6 4 2) are usually required <br /> 6-28 <br />