R 325.1602 Definitions; C, D.

Rule 102. (1) "Casing" means an impervious durable pipe that is placed in a well to prevent the walls from caving and to prevent surface drainage, undesirable water, gas, or other fluids, from entering the well. (2) "Coliform group" means all of the aerobic and facultative anaerobic, gram-negative, nonspore-forming, rod-shaped bacteria that ferment lactose with gas formation within 48 hours at 35 degrees Celsius. (3) "Concrete grout" means a mixture of cement, sand, and water in the proportion of 1 bag of cement (94 pounds), an equal volume (1 cubic foot) of dry sand or gravel aggregate, and not more than 6 gallons of clean water. (4) "Confining layer" means geologic material which has a low hydraulic conductivity, which is 5 feet or more in thickness, and which impedes or prevents vertical groundwater movement. (5) "Contaminant" means a biological, chemical, physical, or radiological constituent in water that is or may become injurious to the public health, safety, or welfare. (6) "Date of completion" means the date on which the installation of the pump or pumping equipment was completed, the date on which well drilling was completed if a pump or pumping equipment will not be installed or will be installed by a person other than the well drilling contractor, or the date on which the water supply system is placed into service after the collection of water samples pursuant to the provisions of R 325.1661. (7) "Department" means the state department of public health. (8) "Dewatering well contractor" means an individual, partnership, or corporation which is qualified to engage in dewatering well construction and dewatering well pump installation and which constructs or installs dewatering wells, plugs abandoned dewatering wells, or supervises such work. (9) "Dewatering well pump installer" means an individual, partnership, or corporation which is qualified to engage in installing and operating dewatering pumps and which installs and operates dewatering pumps or supervises such work. (10) "Director" means the director of the department or an authorized representative. (11) "Drilling fluid bentonite" means bentonite that is processed into a powdered form for use as a viscosifier and filtrate reducer in drilling operations. (12) "Dry hole" means an open borehole or cased borehole that does not produce water in sufficient quantity for the intended use.