Laserfiche WebLink
Geothermal Rules <br />Effective Date: September 30, 2004 <br />8.3.1.2 Threaded connections or clamps shall not be used below <br />ground level on any HDPE or copper tubing unless the joint is a service outlet that can <br />be visually observed and inspected. <br />8.3.2 Grout materials approved by the State Engineer include the following: <br />a. neat cement; <br />b. cement-bentonite mixtures; <br />C. cement —fly ash mixtures; <br />d. high solids bentonite (at least thirty (30) percent solids by weight); and, <br />e. thermally enhanced grouts (cement -sand or bentonite-sand). <br />8.3.2.1 All grout materials shall be mixed by the method and in the <br />proportions specified by the manufacturer. Excess water shall not be used in the <br />preparation of grout materials. The type and amount (by weight) of each constituent <br />used in the grout mixture shall be reported on a form prescribed by the State Engineer. <br />8.3.3 Only a non -toxic fluid shall be used in a Type A-CLH or Type A-CLV <br />well. Fluids approved by the State Engineer are: <br />a. potable water; <br />b. aqueous solution of sodium or calcium chloride; <br />C. aqueous solution of potassium acetate containing less than one (1) <br />percent corrosion inhibitors; <br />d. food grade propylene glycol; <br />e. methanol -water solution up to twenty (20) percent methanol by volume; <br />f. ethanol -water solution up to twenty (20) percent ethanol by volume; and, <br />g. R-22 refrigerant is approved for use in a closed -loop direct exchange (DX) <br />system. <br />Use of any fluid or vapor not specified in this Rule requires a variance from the <br />State Engineer prior to its use (see Rule 14). <br />8.4 Type A-CLH Well Construction (horizontal closed -loop) - Installation shall be <br />in accordance with manufacturer and designer specifications and must be performed by <br />or under the supervision of a certified individual. A Type A-CLH well need not be <br />constructed by or under the supervision of a water well construction contractor licensed <br />by the State Board of Examiners of Water Well Construction and Pump Installation <br />Contractors. <br />8.4.1 Trenches or excavations for horizontal pipe/tubing loops shall be back - <br />filled with materials no more permeable than the surrounding soil. Back -fill materials <br />shall be clean and free of contaminants and shall be adequately compacted to minimize <br />the potential for forming a depression or sump that would allow infiltration of surface <br />run-off or other fluids. <br />20 <br />