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~i • Appentllz i.3-4; Drilling, Completion, end Sampling Techniques Drilling and Mell Completion Description of the shallor hole drilling end completion can be found In Appentllz 3.3-3. Bedrock holes ^ere Core drilled to depth, using synihetlic drilling muds end occasionally, only water, During times o+ lost clrculnt ion, bentonite mud and lost circulation material rare used. The notes rare then ge oDhyslcelly logged. Tne completion strings consisted of a section of pert ore+e0 (1 /4-inch holes on 1 foot centersl 1-Inch steel pipe, a 30-inch Inf letiDle packer, end 1-Inch steel pipe to the surface. All pipe lengths were meeeured t0 the nearest .D1~ to insure that the packer ras placed et the desiretl Interval. A calculate0 volume of cement was then placed Dy use of a tremmie DiDe by upward displacement. The packers remained Inflated until ine Cement plug had set. All cement plugs were verified by use of the iremmie pipe for tagging. In the case of SK-3H, cement could not De placed rlin any certainty because o1 the hole being horixontel, In this Hole, two DaCkers rare Installed t0 provide monlfOring of three 20ne5. A pressure regulator is being USed t0 melntdin pressure in the packers. Tne peckers have remaine0 Inf toted 90f Of the time during the last 2 years. Ne have had problems rich the brass fittings expanding end contracting severely during the spring and fall and deflating ine packers for short time periods. These deflation times are Indicated on the data sheets. Sampling All nonfloring rolls rare develOpetl rith air upon Completion. Floring rolls rare alloyed fo tree 41or for several hours, removing many tens of casing volumes. Tro to three casing volumes rare removed rlth a PVC bailer (nonfloring yells), when practical, prior to sampling. All containers, Inclutling the bailer rare rinsed rlth the rater to De sampled and distilled rater betreen sampling sites. Callbretetl pH entl conductivity meters end thermometer rare used to measure field parameters at each site. A 100 fiberglass tape rlih a plopper ras used to measure rater levels to the nearest .01~. The Collected rater sample ras field filtered through .45 micron membranes end placed In sample bottles, containing acid preservatives supplied Dy the lab (one nitric, one sulphuric, one blank). These bottles rare then plated In en tCe chest to maintain temperatures Just above freezing. Samples rare delivered to the lab for analysis rltnln 24 to 36 hours otter removef 7rom the ground. Analyses have Deen performed Dy Industrial Lebs of Denver during the entire project. Industrial Lebs uses EPA accepted testing •