NR 419.045(8)(a) (a) The characteristics shall be determined at a location between the point where the process wastewater exits a process unit and before the process wastewater is exposed to the atmosphere, treated for VOC removal, or mixed with another wastewater stream. For wastewater streams at a facility meeting the applicability requirements under sub. (1) (a) 1. and 2. and which, prior to February 1, 2012, were either actually being mixed, or construction had commenced which would result in the wastewater streams being mixed, the mixing does not establish a limit on where the characteristics may be determined.

NR 419.045(8)(b) (b) The flow rate of a wastewater stream shall be determined on the basis of an annual average by one of the following methods:

NR 419.045(8)(b)1. 1. The highest annual quantity of wastewater managed, based on historical records for the most recent 5 years of operation, or for the entire time the wastewater stream has existed if less than five years, but at least one year.

NR 419.045(8)(b)2. 2. The maximum design capacity of the waste management unit.

NR 419.045(8)(b)3. 3. The maximum design capacity to generate wastewater of the process unit generating the wastewater stream.

NR 419.045(8)(b)4. 4. Measurements that are representative of the actual, normal wastewater generation rates.

NR 419.045(8)(c) (c) The VOC concentration of a wastewater stream shall be determined on the basis of a flow-weighted annual average by one of the methods in this paragraph, or by a combination of the methods. If the department determines, with written concurrence from EPA, that the VOC concentration cannot be adequately determined by the method in subd.1. or 2., the VOC concentration shall be determined in accordance with subd. 3., or by a combination of the methods in subds. 1., 2., and 3. VOC with a Henry’s Law Constant less than 1.8 x 10-6 atm-m3/mole (0.1 y/x) at 25°C may not be included in the determination of VOC concentration.

NR 419.045(8)(c)1. 1. Sufficient information to document the VOC concentration.

NR 419.045 Note Note: Examples of sufficient information include material balances, records of chemical purchases, or previous test results.

NR 419.045(8)(c)2. 2. Sufficient information to demonstrate that the bench-scale or pilot-scale test concentration data are representative of the actual VOC concentration.

NR 419.045(8)(c)3. 3. Collect a minimum of three representative samples from the wastewater stream and determine the affected VOC concentration for each sample in accordance with sub. (5). The affected VOC concentration of the wastewater stream shall be the flow-weighted average of the individual samples.

NR 419.045(8)(d) (d) The annual affected VOC loading in wastewater for a wastewater stream shall be the annual average flow rate determined in par. (b) multiplied by the annual average affected VOC concentration determined in par. (c).

NR 419.045(8)(e) (e) The annual VOC loading in wastewater for a facility shall be the sum of the annual VOC loading in wastewater for each affected VOC wastewater stream.

NR 419.045(9) (9) Maintenance wastewater requirements. Each owner or operator of a source subject to this section shall comply with the following requirements for maintenance wastewaters containing volatile organic compounds:

NR 419.045(9)(a) (a) The owner or operator shall prepare a description of maintenance procedures for management of wastewaters generated from the emptying and purging of equipment in the process during temporary shutdowns for inspections, maintenance, and repair and during periods which are not shutdowns. The descriptions shall specify all of the following:

NR 419.045(9)(a)1. 1. The process equipment or maintenance tasks that are anticipated to create wastewater during maintenance activities.

NR 419.045(9)(a)2. 2. The procedures that will be followed to properly manage the wastewater and control VOC emissions to the atmosphere.

NR 419.045(9)(a)3. 3. The procedures to be followed when clearing materials from the process equipment.

NR 419.045(9)(b) (b) The owner or operator shall modify and update the information required by par. (a) as needed following each maintenance procedure based on the actions taken and the wastewaters generated in the preceding maintenance procedure.

NR 419.045(9)(c) (c) The owner or operator shall maintain a record of the information required under this subsection.

NR 419.045 History History: CR 08-104: cr. Register July 2009 No. 643, eff. 8-1-09; CR 11-005: r. and recr. Register January 2012 No. 673, eff. 2-1-12; correction in numbering in (1) (a) 3. d. under s. 13.93 (4) (b) 1. Register January 2012 No. 673.

NR 419.05 NR 419.05 Storage of any organic compound.

NR 419.05(1) (1) Applicability.

NR 419.05(1)(a) (a) This section applies to all storage tanks for organic compounds having capacities greater than 151,412 liters (40,000 gallons) in the Southeastern Wisconsin Intrastate AQCR, and to all such storage tanks throughout the state on which construction or modification commenced after April 1, 1972, with the following exceptions:

NR 419.05(1)(a)1. 1. Tanks storing organic compounds that are not photochemically reactive on which construction or modification commenced before August 1, 1979.

NR 419.05(1)(a)2. 2. Tanks used exclusively for storing organic compounds exempted under s. NR 425.04 (1) (a).

NR 419.05(1)(b) (b) Where a provision of s. NR 420.03 also applies, the more stringent requirement shall be met.

NR 419.05(2) (2) Storage requirements. When storing organic compounds, solvents, or mixtures having a vapor pressure equal to or greater than 10.5 kPa (1.52 psia) at 21°C (70°F), floating roofs, vapor condensation systems, vapor holding tanks, or equally effective alternative control methods approved by the department shall be used. Any alternative control method approved by the department under this subsection shall be submitted to, and will not become effective for federal purposes until approved by, the administrator or designee as a source-specific revision to the department’s state implementation plan for ozone.

NR 419.05 History History: Renum. from NR 154.13 (2) (c) and am. Register, September, 1986, No. 369, eff. 10-1-86; am. (1) (a) 2., Register, February, 1990, No. 410, eff. 3-1-90; am. (2), Register, December, 1993, No. 456, eff. 1-1-94; am. (2), Register, December, 1996, No. 492, eff. 1-1-97.