NR 810.46(2)(b)
(b) Systems receive the
Cryptosporidium treatment credit for ozone by meeting the corresponding ozone CT values found in
s. NR 810.61 for the applicable water temperature.
NR 810.46(3)
(3) Site-specific study. The department may approve alternative chlorine dioxide or ozone CT values to those referenced in
sub. (2) on a site-specific basis. The department shall base this approval on a site-specific study a water supplier for a system conducts that follows a department-approved protocol.
NR 810.46(4)
(4) Ultraviolet light. Public water systems receive
Cryptosporidium,
Giardia lamblia, and virus treatment credits for ultraviolet (UV) light reactors by achieving the corresponding UV dose values shown in
s. NR 810.62. Water suppliers for the systems shall validate and monitor UV reactors as described in
pars. (b) and
(c) to demonstrate that they are achieving a particular UV dose value for treatment credit.
NR 810.46(4)(a)
(a) UV dose table. The treatment credits listed in the dose table in
s. NR 810.62 are for UV light at a wavelength of 254 nm as produced by a low pressure mercury vapor lamp. To receive treatment credit for other lamp types, water suppliers for the systems shall demonstrate an equivalent germicidal dose through reactor validation testing, as described in
par. (b). The UV dose values in this table are applicable only to post-filter applications of UV in filtered systems and to unfiltered systems.
NR 810.46(4)(b)
(b)
Reactor validation testing. Systems shall use UV reactors that have undergone validation testing to determine the operating conditions under which the reactor delivers the UV dose required in
par. (a), also known as the validated operating conditions. These operating conditions shall include flow rate, UV intensity as measured by a UV sensor, and UV lamp status.
NR 810.46(4)(b)1.
1. When determining validated operating conditions, water suppliers for the systems shall account for the following factors: UV absorbance of the water; lamp fouling and aging; measurement uncertainty of on-line sensors; UV dose distributions arising from the velocity profiles through the reactor; failure of UV lamps or other critical system components; and inlet and outlet piping or channel configurations of the UV reactor.
NR 810.46(4)(b)2.
2. Validation testing shall include the following: Full scale testing of a reactor that conforms uniformly to the UV reactors used by the system and inactivation of a test microorganism whose dose response characteristics have been quantified with a low pressure mercury vapor lamp.
NR 810.46(4)(b)3.
3. The department may approve an alternative approach to validation testing.
NR 810.46(4)(c)1.1. Water suppliers for the systems shall monitor their UV reactors to determine if the reactors are operating within validated conditions, as determined under
par. (b). This monitoring shall include UV intensity as measured by a UV sensor, flow rate, lamp status, and other parameters the department designates based on UV reactor operation. Water suppliers for the systems shall verify the calibration of UV sensors and shall recalibrate sensors in accordance with a protocol the department approves.
NR 810.46(4)(c)2.
2. To receive treatment credit for UV light, systems shall treat at least 99.9% of the water delivered to the public during each month by UV reactors operating within validated conditions for the required UV dose, as described in
pars. (a) and
(b). Systems shall demonstrate compliance with this condition by the monitoring required under
subd. 1.
NR 810.47
NR 810.47 CT table for giardia when using free chlorine at 0.5
°C or lower.
NR 810.47 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.48
NR 810.48 CT table for giardia when using free chlorine at 5
°C.
NR 810.48 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.49
NR 810.49 CT table for giardia when using free chlorine at 10
°C.
NR 810.49 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.50
NR 810.50 CT table for giardia when using free chlorine at 15
°C.
NR 810.50 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.51
NR 810.51 CT table for giardia when using free chlorine at 20
°C.
NR 810.51 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.52
NR 810.52 CT table for giardia when using free chlorine at 25
°C.
NR 810.52 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.53 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.54 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.55 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
1Systems may use this equation to determine log credit between the indicated values: Log credit = (0.001506 × (1.09116)Temp) × CT.
NR 810.56 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.57 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.58 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.59 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.60 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
1Systems may use this equation to determine log credit between the indicated values: Log credit = (0.0397 × (1.09757)Temp) × CT.
NR 810.61 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
NR 810.62 History
History: CR 09-073: cr.
Register November 2010 No. 659, eff. 12-1-10.
