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7.5. ICESR 04-08-2014 City of Elk Request for Action ever To Item Number Ice Arena Commission 7.5 Agenda Section Meeting Date Prepared by Arena Manager's April 8,2014 Rich Czech,Arena Manager Update Item Description Reviewed by New State Guidelines for Indoor Air Quality Michael Hecker,Parks and Recreation Director Reviewed by Cal Portner, City Administrator Action Requested Information Only Background/Discussion The state has adopted new indoor air quality standards for ice arenas. The purpose of the new rules are to update the air quality standards that were set in the 1980's and to assist the ice rinks to set standards that will protect the public's health. The new rules outline the number of times air quality must be tested,when and where the testing has to be done, and if testing needs to be done at all. Testing isn't required for arenas like Elk River that don't use combustible motors to maintain ice such as the Zamboni and Ice Edger. However arenas are responsible for keeping carbon dioxide and nitrogen dioxide levels below state-mandated levels. Even though the Arena falls under the rule that readings don't have to be kept,we have budgeted funds in 2014 to install a continuous air monitoring equipment for both sheets of ice. Financial Impact • $10,000.00 - $13,000.00 Attachments • Minnesota Department of Health Indoor Air Quality standard rules P' 0WIAEU 0 Ali ' Chapter 4620 Minnesota Department of Health Adopted Permanent Rules Relating to Indoor lee Arenas and Motorsports Arenas Indoor lee Arenas 4620.3900 PURPOSE 4620.3910 APPLICATION 4620.3950 ACCEPTABLE AIR QUALITY 4620.4000 DEFINITIONS 4620.4100 CERTIFICATE OF APPROVAL 4620.4450 TRAINING 4620.4510 MEASUREMENT OF AIR QUALITY CONDITIONS 4620.4550 AIR QUALITY MEASURING DEVICES 4620.4600 FAILURE TO MAINTAIN AIR QUALITY 4620.4650 RECORD KEEPING 4620.4700 OTHER FUEL-BURNING EQUIPMENT 4620.4800 ENFORCEMENT 4620.4900 VARL4NCE TO RULES RELATING TO INDOOR ICE ARENAS 4620.3900 PURPOSE. The purpose of parts 4620.3900 to 4620.4800 is to protect public health by ensuring acceptable air quality in the operation and maintenance of indoor ice arenas. 4620.3910 APPLICATION. Parts 4620.3900 to 4620.4800 apply to owners or operators of indoor ice arenas. 4620.3950 ACCEPTABLE AIR QUALITY. The owner or operator of an indoor ice arena must maintain acceptable air quality conditions at all times in areas of the arena building that are open to the public_ Such conditions are defined as: one-hour average air concentration of not more than 20 parts of carbon monoxide per one million parts of air by volume(20 ppm), and one-hour average air concentrations of not more than 0.3 parts of nitrogen dioxide per one;million parts of air by volume (0-3 ppm). 4620.4000 DEFINITIONS. Subpart 1. Scope. For the purposes of parts 4620.3900 to 4620.4800,the following terms shall have the meanings given them_ Subp. l a. Air duality measuring device. "Air quality measuring device" means direct-read pump and colorimetrie tube or electronic real-time gas detection equipment for sampling and measuring nitrogen dioxide and carbon monoxide air concentrations_ Subp_ 3a. Arena. "Arena" means an indoor ice arena. Subp. 3b.Arena building. "Arena building"means a structure with a roof and walls that houses an indoor ice arena. Subp.4_ Certificate. "Certificate"paeans a certificate of approval issued by the commissioner under parts 4620.3900 to 4620.4800. Subp. 5a. Commissioner. "Commissioner" means the commissioner of health or the commissioner's designee. Subp. 5b. Edging. "Edging"means operation of an ice edger. Subp..7a. lee edger. "Ice edger"means power equipment used to modify the perimeter of an ice sheet_ Subp. 7b. Ice maintenance machine. "Ice maintenance machine"means an ice resurfacer or ice edger_ Subp: 7o. lee resurfacer. "Ice resurfacer" means power equipmo .4sed to modify the entire surface of the ice. Subp. 7d. Indoor ice arena. "Indoor lee arena"means a single room of a permanent or temporary structure where an ice sheet is maintained having the following characteristics: A_ the room has a roof-, Indoor Ice Arena Rules B. 20 minutes after the next five uses of ice maintenance equipment; and C. at least once per day for the subsequent three days of arena operation. Subp. 3. Report. Whenever corrective action is required under subpart 1, the owner or operator must submit a report to the commissioner within five business days that includes: A. an explanation of why corrective action was necessary; B. a description'of the immediate corrective actions that were taken; C. a record of all air quality tests required by subpart 2; and D. an action plan to prevent a reoccurrence. Subp. 4. Arena evacuations necessary. A. The owner or operator must evacuate an area of the arena building whenever: (1) measured carbon monoxide air concentrations exceed 83 ppm or measured nitrogen dioxide air concentrations exceed 2.0 ppm for more than five minutes; (2) measured carbon monoxide air concentrations exceed 40 ppm or measured nitrogen dioxide air concentrations exceed 0.6 ppm for more than one hour after originally measuring unacceptable air quality conditions; or (3) measured carbon monoxide air concentrations exceed 20 ppm or measured nitrogen dioxide air concentrations exceed 0.3 ppm for more than two hours after originally measuring unacceptable air quality conditions. B. When evacuation becomes necessary, the owner or operator must: (1) contact the local fare department as soon as possible to request assistance in evacuating the facility and assessing the hazard; and (2) contact the Minnesota Department of Health upon completing evacuation. C. The evacuated areas may only be reoccupied by the public after an evacuation under item A if'. (1) acceptable air quality conditions are measured; (2) corrective measures have been taken to prevent further incidence of unacceptable air quality conditions; and (3) acceptable air quality conditions and corrective measures are verified by the local fare department or the Minnesota Department of Health. 4620.4650 RECORD KEEPING. The owner or operator must keep a record-keeping log to maintain all documentation required by parts 4620.3900 to 4620.4600. A. Documents that must be maintained in the record-keeping log are: (1) training records required by part 4620.4450; (2) air quality measurement records required by part 4620.45 10, subpart 5; (3) air quality measuring device records required by part 4620.4550, subpart2; and (4) corrective action reports required by part 4620.4600, subpart 3. B. The record-keeping log must be kept in the arena building and be available for public and commissioner review during all hours that the arena building is open to the public. C. Required documents must be retained for at least three years. 4620.4700 OTHER FUEL-BURNING EQUIPMENT. Subpart 1.Notification required. The owner or operator must notify the commissioner when using equipment other than ice maintenance machines for operating or maintaining the ice arena, if that equipment is capable of producing carbon monoxide or nitrogen dioxide and is not directly vented to the outdoors. Subp. 2. Notification process. The owner or operator must notify the commissioner by: A. providing the department with a list of such equipment that the owner or operator proposes to use in its annual certificate application; and B. notifying the commissioner by telephone or in writing before using other fuel-burning equipment in the arena if the equipment was not included in its annual submission to the commissioner. Indoor Ice Arena Rules 4620.4510 MEASUREMENT OF AIR QUALITY CONDITIONS. Subpart 1. Measuring air quality. Owners or operators of indoor ice arenas must measure carbon monoxide and nitrogen dioxide air concentrations in each arena when internal combustion engine-powered ice maintenance equipment is used. Subp. 2.Persons who can take measurements.Measurements must be made by an individual who has received training as specified in part 4620.4450. Subp. 3. Measurements for ice resurfacing. Owners or operators must measure air concentrations at least twice per week after using an internal combustion engine-powered ice resurfacer.Measurements roust be taken: A. at board height,inside the boards, and at the centerline of the ice; B. 20 minutes after completing resurfacing unless the commissioner has granted the operator approval to measure under an alternative schedule; C. at times of maximum use of the resurfacing machine; and D. at least once on Saturday or Sunday of each week that the arena is open to the public. Subp.4. Measurements for ice edging. A. Owners or operators must measure air concentrations at least once per week after using an internal combustion engine-powered ice edger. Measurements must be taken following a time of maximum ice edger use at board height, inside the boards, and at the centerline of the ice= (1) 20 minutes after completing edging if the arena building is open to the public when edging occurs;or (2) before the public reoccupies the arena, if the arena is not open to the public when edging occurs_ B. Owners or operators may measure under an alternative schedule if the commissioner has approved one. Subp. 5. Measurement records. Owners or operators roust keep a record of measurement findings and make them available to the commissioner upon request. Subp. 6. Additional measurements. Owners or operators roust make additional measurements as detennined by the commissioner. 4620.4550 AIR QUALITY MEASURING DEVICES. Subpart 1.Device requirements.The owner or operator must demonstrate that the device and methods used to measure air quality conditions are accurate and reliable.Air quality measuring devices must be: A_ capable ofrneasuring carbon monoxide air concentrations in a range from 0 to 100 parts per million (ppM)in increments of 1 ppm; or B. capable of measuring nitrogen dioxide air concentrations in a range from 0 to 5 parts per million (ppm) in increments of 0.1 ppm_ Subp.2. Maintenance. The owner or operator,must operate, store,maintain, and calibrate the devices according to the device manufacturer's specifications. The owner or operator roust also keep maintenance and calibration records. 4620.4600 FAILURE TO MAINTAIN AIR QUALITY. Subpart 1. Corrective action necessary. The owner or operator roust take immediate corrective action when measurements of more than 20 ppm of carbon monoxide or more than 0.3 ppm.of nitrogen dioxide are made in an area of the arena building that is open to the public. Corrective action must include: A. increasing the ventilation rate immediately; and B. suspending internal combustion-powered equipment use. The owner or operator roust continue corrective action until measurements show not more than 20 ppm of carbon monoxide and not more than 0.3 ppm of nitrogen dioxide in all areas of the arena building that are open to the public. Subp. 2. Follow-up testing.The owner or operator must conduct and document the following air quality tests to confirm the effectiveness of the corrective action: A. at 20-minute intervals until measurements show not more than 20 ppm of carbon monoxide and not more than 0.3 ppm of nitrogen dioxide; Indoor ice Arena Rules B. the room is bounded by walls, doorways, or windows, whether open or closed; and C. the walls, doorways, or windows cover more than 50 percent of the combined surface area of the vertical planes that make up the room's perimeter(sides). Subp. 7e. Operator. "Operator" means the person designated by the owner as responsible to operate and maintain the indoor ice arena. Subp. 7f. Owner. "Owner"means the person having legal title to the indoor ice arena or the owner's legally authorized representative. Subp. 8. Person. "Person" means any natural individual, corporation,partnership, or other business association and includes the state and its political subdivisions. Subp. 8a. Responsible person. "Responsible person"means the individual authorized by the operator to ensure acceptable air quality conditions in the arena. Subp. 9. Resurfacing. "Resurfacing" means operation of an ice resurfacer. 4620.4100 CERTIFICATE OF APPROVAL. Subpart I. Applicability.No person may own or operate an indoor ice arena unless the commissioner issues the person a certificate. Subp. 2. Certificate application.Applications for a certificate must be submitted on forms prescribed by the commissioner.An application must be submitted: A. annually, by owners or operators of all existing indoor ice arenas; and B_ at Icast 30 days before owners or operators open new indoor ice arenas to the public. Subp. 3. Certificate issuance. The commissioner must issue a certificate under subpart 2, if the commissioner determines that the owner or operator has complied with parts 4620.3900 to 4620.4800 and demonstrated the ability to maintain acceptable air quality conditions in the arena building. Subp. 4. Certificate expiration and renewal.A certificate issued under this part expires one.year from the date of issue. A. Owners or operators must apply for renewal on forms prescribed by the commissioner at least 30 days before a certificate expires. B. If a certificate expires while a renewal application is pending approval, the arena may continue to operate under the expired certificate until the commissioner issues a new certificate or denies the renewal application. Subp. S. Posting of certificate. The certificate must be prominently displayed in a location that is clearly visible to the public. 4620.4450 TRAINING. Subpart 1. Requirements. The owner or operator must ensure that a trained responsible person is available in the arena building at all times that the arena is open to the public. Training must: A. be appropriate for the trainee's level of responsibility in operating the arena; B. be performed annually; C. include the following topics: (1) acceptable air quality conditions; (2) methods of maintaining acceptable air quality in the arena; (3) proper operation and storage of the arena air quality measuring device; (4) proper collection of air samples with the arena air quality measuring device; (5) appropriate actions for correcting unacceptable air quality; and (6) record-keeping requirements; and D. be documented. Subp. 2_Documentation. Trainees must acknowledge,with their written signature,that they have received training meeting the requirements of this part. Owners or operators must maintain the written acknowledgment according to part 4620.4650. Indoor Ice Arena Rules Subp. 3. Air quality measurement.The owner or operator must ensure acceptable air quality in the arena building when using other fuel-burning equipment by measuring the air quality conditions and reporting as the commissioner directs, depending upon the specific type of activity to be conducted in the building. 4620.4800 ENFORCEMENT. Violations of the requirements of parts 4620.3900 to 4620.4700 shall constitute grounds for the commissioner to take one or more of the enforcement actions in Minnesota Statutes, sections 144.989 to 144.993, subject to the notice and appeal provisions set forth in applicable law. 4620.4900 VARIANCE TO RULES RELATING TO INDOOR ICE ARENAS. The commissioner shall grant variances to parts 4620.3900 to 4620.4800, except part 4620.3950, only according to the procedures and criteria specified in parts 4717.7000 to 4717.7050_ Indoor Ice Arena Rules Indoor Motorsports Arenas 4620.5000 PURPOSE 4620.5100 APPLICATION 4620.5200 ACCEPTABLE AIR QUALITY 4620.5300 DEFINITIONS 4620.5400 CERTIFICATE OF APPROVAL 4620.5500 TRAINING 4620.5600 MEASUREMENT OF AIR QUALITY CONDITIONS 4620.5650 AIR QUALITY MEASURING DEVICES 4620.5700 FAILURk TO MAINTAIN AIR QUALITY 4620.5800 RECORD KEEPING 4620.5900 ENFORCEMENT 4620.5950 VARIANCE TO RULES RELATING TO INDOOR MOTORSPORTS.ARENAS 4620.5000 PURPOSE. The purpose of parts 4620.5000 to 4620.5900 is to protect public health by ensuring acceptable air quality in the operation and maintenance of indoor motorsports arenas. 4620.5100 APPLICATION. Parts 4620.5000 to 4620.5900 apply to owners or operators of indoor motorsports arenas. 46205200 ACCEPTABLE AIR QUALITY. The owner or operator of an indoor motorsports arena must maintain acceptable air quality conditions at all times in areas of the arena building that are open to the public. Such conditions are defined as: one-hour average air concentrations of not more than 30 parts of carbon monoxide per one million parts of air by volume (30 PPM), and one-hour average air concentrations of not more than 0.3 parts of nitrogen dioxide per one million parts of air by volume(03 ppm). 4620.5300 DEFINITIONS. Subpart 1. Scope.For the purposes of parts 4620.5000 to 4520.5900,the following terms have the meanings given them. Subp. 2. Air quality measuring device. "Air quality measuring device" means direct-read pump and colorimetric tube or electronic real-time gas detection equipment for sampling and measuring nitrogen dioxide or carbon monoxide air concentrations. Subp. 3. Arena. "Arena" means an indoor motorsports arena. Subp. 4.Arena building. "Arena building" means a structure with a roof and walls that houses an indoor motorsports arena. Subp. 5: Certificate. "Certificate" means a certificate of approval issued by the commissioner under parts 4620.5000 to 4620.5900. Subp_ 6. Commissioner. "Con'kmiSSioner" means the commissioner of health or the commissioner's designee. Subp. 7. Event manager. "Event manager"means the person who organizes or directs a special indoor motorsports event. Subp. 8. Indoor motorsports arena. "Indoor motorsports arena" means a single room of a permanent or temporary structure where motorsports are operated having the following characteristics: A. the room has a ceiling; B. the room is bounded by walls, doorways, or windows,whether opera or closed; and C. the walls, doorways, or windows cover more than 50 percent of the combined surface area of the vertical planes that make up the room's perimeter(sides). Subp. 9. Motorsports vehicle. Motorsports vehicle" means an internal combustion engine-powered vehicle used for recreation, racing, competition, or demonstration. Subp. 10. Operating fours. "Operating hours" means the time period that the indoor motorsports arena building is open to the public and motorsports vehicles are being used in the arena. Indoor Motorsports Amia Rulcs Subp. 1 1. Operator_ "Operator" means the person designated by the owner as responsible to operate and maintain the indoor motorsports arena. Subp. 12. Owner. "Owner"means the person having legal title to the arena building or the owner's legally authorized representative. Subp. 13. Person. "Person."means any natural individual, corporation,partnership, or other business association and includes the state and its political subdivisions. Subp. 14. Responsible person. "Responsible person"means the individual authorized by the operator to ensure acceptable air quality conditions in the arena building. Subp. 15. Special indoor motorsports event. "Special indoor motorsports event" means a single event where motorsports vehicles are operated in an arena. Subp. 16, Spectator. "Spectator"means a member of the public present in the arena building who is not a motorsports vehicle driver or rider or an actively working employee. Subp. 17. Spectator area. "Spectator area"means that part of the indoor motorsports arena building where spectators are allowed to assemble. 4620.5400 CERTIFICATE OF APPROVAL. Subpart 1. Applicability.No person shall own or operate an indoor motorsports arena unless the commissioner issues the person a certificate. Subp. 2. Certificate application. Applications for a certificate must be submitted on forms prescribed by the commissioner. An'application must be submitted A. annually, by owners or operators of existing indoor motorsports arenas; B. at least 30 days before owners or operators open new indoor motorsports arenas to the public; and C. at least 30 days before the arena owners or operators and the event manager begin a special indoor motorsports event. Subp. 3. Certificate issuance. A- The commissioner must issue a certificate under subpart 2, item A or B, if the commissioner determines that the owner or operator has complied with parts 4620.5000 to 4620.5900 and demonstrated the ability to maintain acceptable air quality conditions in the arena building. B. The commissioner shall issue a certificate granting approval to hold a special indoor motorsports event if the owner or operator meets the requirements of item A and: (1) submits a written plan to the commissioner that describes the methods that the owner or operator will use to monitor air quality and ensure acceptable air quality during the event; and (2) the event manager and arena operator agree to the terms of the plan in writing. Subp. 4. Certificate expiration and renewal.A certificate issued under this part expires one year from the date of issue, except that a certificate for a special indoor motorsports event expires as the certificate describes. A_ Owners or operators shall apply for renewal on forms prescribed by the commissioner at least 30 days before a standard certificate expires. B_ if a certificate expires while a renewal application is pending approval, the arena may continue to operate under the expired certificate until the commissioner issues a new certificate or denies the renewal application. Subp- 5-Posting of certificate. The certificate must be prominently displayed in a location that is clearly visible to the public. 4620.5500 TRAINING. Subpart 1. Requirements.The owner or operator must ensure that a trained responsible person is available in the arena building at all times that the arena is open to the public. Training must: A. be appropriate for the trainee's level of responsibility in operating the arena; B. be performed annually; C. include the following topics: (1) acceptable air quality conditions; (2) methods of maintaining acceptable air quality in the arena; (3) proper operation and storage of the arena air quality measuring device; Indoor Motorsports.Arena Rules (4) proper collection of air samples with the arena air duality measuring device; (5) appropriate actions for correcting unacceptable air quality; and (6) record-keeping requirements; and D. ire<dTo-cumented. Subp.2. Documentation. Trainees shall acknowledge, with their written signature, that they have received training meeting the requirements of this part. The written acknowledgment shall be maintained according to part 4620.5800. 4620.5600 MEASUREMENT OF AIR QUALITY CONDITIONS. Subpart 1. Measuring air quality. Owners or operators of indoor motorsports arenas must measure carbon monoxide and nitrogen dioxide air concentrations in each indoor motorsports arena as directed by the commissioner. Subp_2. Persons who can take measurements.Measurements must be made by an individual who has received training as specified in part 46205500. Subp, 3. Measurement requirements. A. Owners and operators must measure nitrogen dioxide air concentrations as the commissioner directs depending on the specific type of activity to be conducted in.the arena. B. Owners and operators must measure carbon monoxide air concentrations in each indoor motorsports arena building as follows: (1) Frequency of measurements. (a) Certified arenas: i. at least two days per week; ii. at least three hours per week during maximum use of motorsports vehicles; and iii. as the commissioner deems necessary. (b) Special indoor motorsports events: i. on each day of motorsport vehicle use; ii. during all operating hours; and iii as the commissioner deems necessary. (2) Location and documentation of measurements. (a) If motorsports vehicle riders or drivers are not paid performers,measurements must be: i. made at a location on the track that represents average carbon monoxide concentrations. The owner or operator must identify a location on the track that represents average carbon monoxide concentrations; and ii. recorded at least every 15 minutes when motorsports vehicles are used in the arena. (b) If spectators are present during motorsports activities, the operator must measure air quality conditions in the spectator area as follows: i. at the location of poorest air quality in the spectator area of the arena. The owner or operator must identify the location where the general public is exposed to the highest carbon monoxide levels; and ii. recorded at least once every 15 minutes in the spectator area when motorsports vehicles are used in the arena. Subp.4. Measurement records. Owners or operators must keep a record of measurement findings and make it available to the commissioner upon request. 4620.5650 AIR QUALITY MEASURING DEVICE,S. Subpart 1. Device requirements. The owner or operator must demonstrate that the devices and methods used to measure air quality conditions are accurate and reliable. Air quality measuring devices must be:' A. capable of measuring carbon monoxide air concentrations in a range from 0 to at least 100 parts per million (ppm) in increments of I ppm; or Indoor Motorsports Arena Rules B. capable of measuring nitrogen dioxide air concentrations in a range from 0 to at least 5 ppm in increments of 0.1 ppm. Subp. 2. Maintenance. The owner or operator must operate, store,maintain, and calibrate the devices according to the device manufacturer's specifications. The owner or operator must also keep maintenance and calibration records. 4620.5700 FAILURE TO NL4MAIN AIR QUALIiT'Y. Subpart 1. Corrective action necessary. The owner or operator must take immediate corrective action when measurements of more than 30 ppm of carbon monoxide or more than 0.3 ppm of nitrogen dioxide are made for more than 15 minutes in an area of the arena building that is open to the public. Corrective action must include: A. increasing the ventilation rate immediately; and B. suspending internal combustion-powered equipment use, if carbon monoxide measurements remain in excess of 30 ppm or nitrogen dioxide measurements remain in excess of 0.3 ppm for more than one hour after an original exceeding measurement. The owner or operator must continue corrective action until measurements show not more than 30 ppm of carbon monoxide and not more than 0.3 ppm of nitrogen dioxide in all areas of the arena building that are open to the public. Subp. 2. Follow-up testing.The owner or operator must conduct and document the following air quality tests to confirm the effectiveness of the corrective actions: A. at 15-minute intervals until measurements show not more than 30 ppm of carbon monoxide and not more than 0.3 ppm of nitrogen dioxide; and B_ at 15-minute intervals for at least one hour per day for the subsequent three days of arena operation. Subp. 3. Report.Whenever the conditions of subpart 1 occur,the owner or operator must submit a report to the commissioner within five business days that includes_ A. an explanation of why corrective action was necessary-, B. a description of the immediate corrective actions that were taken; C. a record of all air quality tests required by subpart 2; and D. an action plan to prevent a recurrence. Subp. 4.Arena evacuation necessary. A. The owner or operator must evacuate an area of the arena building-whenever: (1) measured carbon monoxide air concentrations exceed 83 ppm,n-or measured nitrogen dioxide concentrations exceed 2.0 ppm for more.than 15 minutes; or (2) measured carbon monoxide air concentrations exceed 30 ppm or measured nitrogen dioxide air concentrations exceed 0.3 ppm for more than two hours after originally measuring unacceptable air quality conditions. B. When evacuation becomes necessary, the owner or operator must: (1) contact the local fire department as soon as possible to request assistance in evacuating the facility and assessing the hazard; and (2) contact the Department of Health upon completing the evacuation- C. Evacuated areas may only be reoccupied by the public after an evacuation under item A if: (1) acceptable air quality conditions are measured; (2) corrective measures have been taken to prevent further incidence of unacceptable air quality conditions; and (3) acceptable air quality conditions and corrective measures are verified by the local fire department or the Department of Health. 4620.5800 RECORD KEEPING. The owner or operator must keep a record-keeping log to maintain all documentation according to parts 4620.5000 to 4620-5400. A. Documents that trust be maintained in the record-keeping log are: (1) training records required by part 4620.5500; (2) air quality measurement records required by part 4620.5600, subpart 4; Indoor Motorsports Arena Rules (3) air quality treasuring device records required by part 4620.5650,subpart 2; and (4) corrective action reports required by part 4620.5700, subpart 3. B. The record-keeping log must be kept in the arena building and be available for public and commissioner review during all hours that the arena building is open to the public. C. Required documents must be retained for at least three years. 4620.5900 ENFORCEMENT. Violations of the requirements of parts 4620.5000 to 4620.5800 shall constitute grounds for the commissioner to take one or more of the enforcement actions in Minnesota Statutes, sections 144.989 to 144.993, subject to the notice and appeal provisions set forth in applicable lane. 4620.5950 VARIANCE TO RULES RELATING TO INDOOR MOTORSPORTS ARENAS. The commissioner shall grant variances to parts 4620.5000 to 4620.5900, except part 4620.5200, only according to the procedures and criteria specified in parts 4717.7000 to 4717.7050. Indoor Motorsports Arena Rules