NR 419.045(4)(b)1.a.a. The width of any seal gap is the distance between the seal and the tank wall and shall be determined by using probes of various widths to accurately measure the actual distance from the seal to the tank wall. NR 419.045(4)(b)1.b.b. The area of any seal gap shall be determined by multiplying the width of the seal gap, as determined in subd. 1. a., by the circumferential length of the gap. NR 419.045(4)(b)1.c.c. The total seal gap area is the accumulated area of all gaps which are greater than 0.125 inch in width. NR 419.045(4)(b)2.2. The accumulated area of gaps that exceed 0.125 inch in width between the secondary seal and tank wall may not exceed 1.0 square inch per foot (21 square centimeters per meter) of tank diameter. NR 419.045(4)(b)3.3. If the seal gap requirement of subd. 2. is not being met, the secondary seal shall be repaired or replaced within 45 days after detection of the improper seal gap unless the repair or correction is technically infeasible without requiring a process unit shutdown, in which case the repair or correction shall be made at the next process unit shutdown. NR 419.045(4)(c)(c) The following records shall be maintained on leaks, improper conditions, and improper seal gaps: NR 419.045(4)(c)1.1. The date on which a leak, improper condition, or improper seal gap is discovered. NR 419.045(4)(c)2.2. The date on which a first attempt at repair was made to correct the leak or improper condition. NR 419.045(4)(c)3.3. The date on which a leak, improper condition, or improper seal gap is repaired. NR 419.045(4)(d)1.1. Monitors shall be installed and maintained to measure operational parameters of any emission control device or other device installed to comply with sub. (2) or (3). Monitoring parameters shall be sufficient to demonstrate proper functioning of the devices to design specifications. Except as provided in subd. 2., the following monitoring and data recording shall be performed as applicable: NR 419.045(4)(d)1.a.a. For an enclosed non-catalytic combustion device, continuously monitor and record the temperature of the gas stream either in the combustion chamber or immediately downstream before any substantial heat exchange. NR 419.045(4)(d)1.b.b. For a catalytic incinerator, continuously monitor and record the temperature of the gas stream immediately before and after the catalyst bed. NR 419.045(4)(d)1.c.c. For a condenser, continuously monitor and record the temperature of the gas stream at the condenser exit. NR 419.045(4)(d)1.d.d. For a carbon adsorber, continuously monitor and record the VOC concentration of exhaust gas stream to determine if breakthrough has occurred. If the carbon adsorber does not regenerate the carbon bed directly in the control device, that is, a carbon canister is used, the exhaust gas stream shall be monitored daily or at intervals no greater than 20% of the design replacement interval, whichever is greater. As an alternative to conducting daily monitoring, the carbon may be replaced with fresh carbon at a regular predetermined time interval that is less than the carbon replacement interval that is determined by the maximum design flow rate and the VOC concentration in the gas stream vented to the carbon adsorber. NR 419.045(4)(d)1.f.f. For a steam stripper, continuously monitor and record the steam flow rate, the wastewater feed mass flow rate, and either the wastewater feed temperature, or the column operating temperature as measured in the column top tray liquid phase at the downcomer. NR 419.045(4)(d)1.g.g. For vapor control systems other than those specified in subds. 1. a. to f., continuously monitor and record the appropriate operating parameters. NR 419.045(4)(d)2.2. In lieu of the monitoring in subd. 1., other monitoring may be approved or required by the department with written concurrence from EPA. NR 419.045(4)(e)(e) For a closed-vent system that is used to comply with sub. (2) or (3), and that is designed to operate at a pressure below atmospheric pressure, the closed-vent system shall be equipped with at least one pressure gauge or other pressure measurement device that can be read from a readily accessible location to verify that negative pressure is being maintained in the closed-vent system when the control device is operating. NR 419.045(5)(5) Approved test methods. Compliance with the emission specifications, vapor control system efficiency, and certain control requirements, inspection requirements, and exemption criteria of subs. (1) (b) and (2) to (4), relating to control requirements, alternate control requirements, inspection and monitoring requirements, and exemptions, shall be determined by applying one or more of the test methods and procedures, as appropriate, in this subsection. Minor modifications to test methods and procedures may be used, if approved by the department with written concurrence from EPA. Test methods other than those specified in this subsection may be used if validated by Method 301 in 40 CFR part 63, Appendix A, incorporated by reference in s. NR 484.04 (25). The test methods are: NR 419.045(5)(b)(b) Methods 18, 25, 25A, or 25B in 40 CFR part 60, Appendix A, incorporated by reference in s. NR 484.04 (13), for determining organic compound emission concentrations or emission rates. NR 419.045(5)(c)1.1. For control devices other than flares, the VOC control efficiency shall be determined in accordance with s. NR 439.07, where the flow rate and VOC concentration of the inlet and outlet gas streams of the control device are measured as specified under pars. (a) and (b). NR 419.045(5)(d)(d) ASTM D323-08, D2879-10, D4953-06, D5190-07, or D5191-10b, adjusted for actual storage temperature in accordance with American Petroleum Institute publication 2517, incorporated by reference in s. NR 484.11 (5), for the measurement of vapor pressure. The ASTM methods are incorporated by reference in s. NR 484.10 (6), (39m), (55b), (55bg), and (55br), respectively. NR 419.045(5)(f)(f) For determining the VOC concentration of wastewater samples, any of the methods in subds. 1. to 6., except that in the event of any conflicts, subd. 6. shall take precedence.