BOH Agenda 022620 - Laserfiche WebLink

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or other non-potable water shall be cased and grouted so that contamination of overlying and underlying groundwater zones shall not occur. 15. The top of the casing shall be terminated at least 12 inches above land surface, regardless of the method of well construction and type of pump to be installed. (6) The casing in wells constructed to obtain water from a consolidated rock formation shall meet the requirements specified in this Rule and shall: a) Prevent any formational material from entering the well in excess of the levels specified in Paragraph (H)of this Rule; and b) Firmly seated at least five feet into the rock. c)The casing in wells constructed to obtain water from an unconsolidated rock formation (such as gravel, sand or shells)shall extend at least one foot into the top of the water-bearing formation. d) Upon completion of the well,the well shall be sufficiently free of obstacles including formation material as necessary to allow for the installation and proper operation of pumps and associated equipment. e) Prior to removing equipment from the site, the top of the casing shall be sealed with a water-tight cap or well seal, as defined in G.S. 87-85(16),to preclude the entrance of contaminants into the well. History Note: Substitute for NCAC 02C.0107 Eff. July 1, 2008;Amended eff. October 23, 2009;November 21, 2008;March 25, 2020 E.Allowable Grouts) Comment[VH55]:SECTION E-F REVISED OCHD SECTION TO ADOPT STATE VERBIAGE 02C.0107 1. One of the following grouts shall be used wherever grout is required by a rule of this Section.Where a particular type of grout is specified by a Rule of this Section, no other type of grout shall be used. a) Neat cement grout shall consist of a mixture of not more than six gallons of clear, potable water to one 94 pound bag of Portland cement. Up to five percent, by weight, of untreated Wyoming sodium bentonite may be used to improve flow Comment[VH56]:CLARIFICATION OF THE and reduce shrinkage. The Wyoming sodium bentonite shall be 200 mesh with a GROUTING MATERIAL SUGGESTED BY STATE yield rating of 90 barrels per ton. If bentonite is used, additional water may be added at a rate not to exceed 0.6 gallons of water for each pound of untreated Wyoming sodium bentonite. b) Sand cement grout shall consist of a mixture of not more than two parts sand and one part cement and not more than six gallons of clear, potable water per 94 pound bag of Portland cement. c) Concrete grout shall consist of a mixture of not more than two parts gravel or rock cuttings to one part cement and not more than six gallons of clear, potable water per 94 pound bag of Portland cement. One hundred percent of the gravel or rock cuttings must be able to pass through a one-half inch mesh screen. 23