R 325.10104 Definitions; D, E.

Rule 104.  As used in these rules:

(a) "Department" means the department of environmental quality or its authorized agent or representative.

(b) "Deviation" means an exception to a department rule establishing minimum standards or requirements issued in writing or as a condition to a permit to a supplier of water.

(c) "Direct filtration" means a series of processes, including coagulation and filtration, but excluding sedimentation, resulting in substantial particulate removal.

(d) "Director" means the director of environmental quality or his or her authorized agent or representative.

(e) "Disinfectant contact time" (T in CT calculations) means the time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point at or before the point where residual disinfectant concentration is measured.  Disinfectant contact time in pipelines shall be calculated based on plug flow by dividing the internal volume of the pipe by the maximum hourly flow rate through that pipe.  Disinfectant contact time within mixing basins and storage reservoirs shall be determined by tracer studies or an equivalent demonstration.

(f) "Disinfection profile" means a summary of Giardia lamblia, and in certain cases, virus inactivation through the treatment plant.

(g) "Distribution system" means a system that consists of the following components through which water is distributed and used or intended for use for drinking or household purposes:

(i) Piping.

(ii) Transmission or distribution mains.

(iii) Pumps.

(iv) Pumping stations.

(v) Storage tanks.

(vi) Controls.

(vii) Associated appurtenances.

(h) "Division" means the drinking water and radiological protection division of the department.

(i) "Domestic or other non-distribution system plumbing problem" means a coliform contamination problem in a public water system which has more than 1 service connection that is limited to the specific service connection from which the coliform positive sample was taken.

(j) "Drawdown" means the difference between the static water level and the pumping water level in a well or, for a flowing artesian well, the difference between an established datum above ground and the pumping water level.

(k) "Effective corrosion inhibitor residual," for the purpose of lead and copper control, means a concentration that is sufficient to form a passivating film on the interior walls of a pipe.

(l) "Emergency" means a situation in a public water supply that results in contamination, loss of pressure, lack of adequate supply of water, or other condition that poses an imminent hazard or danger to the public health.

(m) "Enhanced coagulation" means the addition of sufficient coagulant for improved removal of disinfection byproduct precursors by conventional filtration treatment.

(n) "Enhanced softening" means the improved removal of disinfection byproduct precursors by precipitative softening.

(o) "EPA" means the United States environmental protection agency.

(p) "Equivalent certificate" means a certificate which is issued to certain individuals.  Individuals eligible for an equivalent certificate do not hold a current certificate but were issued certification before the effective date of the current rules.

(q) "Established ground surface" means the intended or actual finished grade or elevation of the surface of the ground at the site of a water supply facility.

(r) "Exemption" means an order, with appropriate conditions, time schedules, and compliance requirements, that is issued by the director to a supplier of water permitting a public water supply to be in temporary noncompliance with a state drinking water standard, including a specified treatment technique.

History:  1954 ACS 94, Eff. Jan. 12, 1978; 1979 AC;  1991  MR  11,  Eff. Nov. 22, 1991; 1994 MR 12, Eff. Jan. 5, 1995; 1998 MR 3, Eff. Apr, 8, 1998; 2000 MR 19, Eff. Dec. 8, 2000; 2003 MR 2, Eff. Jan. 29, 2003; 2005 MR 6, Eff. Apr. 6, 2005.