Section 93.500. General requirements.

 

(1)   Secondary containment.

(a) General. All new and replacement underground storage tanks and piping systems shall be provided with secondary containment and continuous electronic interstitial monitoring, except as provided in par. (b) .

(b) Exceptions. This section does not apply to any of the following:

1. Any farm or residential underground storage tank system which has a capacity of less than 1,100 gallons and which is used for storing motor fuel for noncommercial purposes.

2. Any underground storage tank system which has a capacity of less than 4,000 gallons and which is used for storing heating oil for consumptive use on the premises where stored.

3. Piping of safe suction systems, that is installed before August 1, 2009.

4. A pipe manifold connecting 2 or more tanks, that is installed before August 1, 2009.

5. Airport fuel hydrant systems.

(c) Motor fuel dispenser containment. All new motor fuel dispensing systems and all new dispensers added to an existing island or to an extension of existing pipe shall have under-dispenser containment.

(2)   Flexible connections. Flexible piping approved under s. ATCP 93.130 or listed metallic flex connectors shall be used in all of the following locations:

(a) At the top of the tank.

(b) Between the tank and the vent pipe.

(c) Below the dispenser.

(d) In fiberglass pipe, where there are sections less than 4 feet long between turns.

(3)   Underground tank design.

(a) General. Tanks designed and built for underground use may not be used aboveground.

(b) Tanks for Class I, II, IIIA or IIIB liquids . Tanks used for underground storage of Class I, II, IIIA or IIIB liquids shall be listed and shall comply with the construction and marking requirements in s. ATCP 93.250 .

(c) Reuse of tanks . Tanks that are moved from one underground location to another shall meet all of the following requirements:

1. The integrity of the tank shall be assessed and certified by the manufacturer, or a registered professional engineer, stating that the tank still meets the construction requirements in s. ATCP 93.250 . The certification and a report of the assessment shall be included in the plan review documentation for the new installation.

2. The integrity assessment required in subd. 1. shall occur after the tank has been removed.

3. The tank shall meet all the installation requirements in this chapter.

(4)   System access.

(a) Underground storage tank systems shall be designed and constructed to allow access to all connections between the tank and piping, venting, and appurtenances that require maintenance, inspection or replacement.

(b) The means of access shall be sufficient in size to allow for installation, maintenance and inspection of all system appurtenances.

(c) The means of access shall allow sufficient clearance for proper drainage from surface water incursion.

(5)   Secondary containment for piping.

(a)

1. When any underground product piping is installed as part of a new tank system or when 50 percent or more of a run is replaced, the piping shall be provided with approved secondary containment with non-discriminating electronic interstitial monitoring, except as specified in subd. 2.

2.

a. Sumps for new or replacement underground fill piping that does not drop vertically into a tank may be monitored visually on a monthly basis, instead of monitored with an electronic sensor.

b. Secondary containment is not required for underground fill piping that drops vertically into a tank.

(b) The material used for fabricating both the primary and secondary containment shall be listed in accordance with a standard that assures liquid- and vapor-tightness.

(c) All pipe connections provided at the dispenser and at the top of the tank, that routinely contain product and are installed or replaced on or after February 1, 2009, shall be placed within a secondary containment sump.

(d) All existing pipe connections at the top of the tank and beneath all freestanding pumps and dispensers, that routinely contain product shall be placed within secondary containment sumps by December 31 of the fifth year following February 1, 2009.

(e) All pipe connections at a transition between aboveground and underground piping that are installed or replaced on or after February 1, 2009, shall be placed within a secondary containment sump at the time of installation or replacement.

(f)

1. Secondary containment sumps provided under this subsection shall have non-discriminating electronic sensors that will detect liquids in the sump, unless approved otherwise by the department.

2. Piping that is installed or replaced on or after August 1, 2009, at secondary containment sumps provided under this subsection may not pass through the bottom of the sump.

3. All electrical conduit and wiring that is installed or replaced on or after August 1, 2009, at secondary containment sumps provided under this subsection for dispensers shall pass over the top of the sump wall rather than through the wall or bottom of the sump.

(6)   Installation.

(a) General.

1.

a. The installation of underground tanks and associated piping shall be performed or supervised by a certified installer.

b. A certified installer shall verify that the installation of the electrical components for a tank system does not conflict with this chapter, except this verification is not required for the electrical criteria in ch. SPS 316 .

2. All installation shall be in accordance with the manufacturer's instructions, the applicable national standards adopted in s. ATCP 93.200 , plans and specifications approved under s. ATCP 93.100 and this chapter.

(b) Tanks.

1. Tanks shall have an air pressure and soap test performed after unloading.

2.

a. All new tanks and pipe systems shall have pressure or vacuum testing that shall assure that the tank, pipe and all connections are tight in accordance with NFPA 30 section 21.5 and PEI RP100 sections 11 and 14 before the tanks and pipe systems are placed into service.

b. If a volumetric tank integrity test is used, it shall be capable of detecting a release of 0.1 gallon per hour from any portion of the tank when the tank is at least 70 percent full of product, shall be approved in accordance with s. ATCP 93.130 , and shall be conducted in accordance with the approval. In addition, a precision tightness test shall be performed on the ullage portion of the tank.

c. If a non-volumetric tank integrity test is used, it shall be capable of detecting a release of 0.1 gallon per hour from any portion of the tank at any product level.

d. The volumetric or non-volumetric tests performed under this section shall be conducted by a certified tank system tightness tester.

3. If the tank has integral secondary containment, both the primary and secondary containment shall be tested in accordance with this section.

(c) Piping .

1. Piping shall be shown to be leak free by testing before backfilling and after backfilling.

2. Pressure piping, or suction piping with a check valve located at the tank, shall pass an approved precision tightness test before being placed into service.

3. Piping that has leak detection provided by electronic line leak detection shall have the leak detection system certified as operable by performing a functional leak test in accordance with the material approval issued under s. ATCP 93.130 , before the piping is placed into service.

4. Any aboveground product or vent piping that is adjacent to or in the path of motorized vehicles or equipment shall have vehicle collision protection meeting the performance requirements in s. ATCP 93.430 , unless approved otherwise by the authorized agent or the department.

(d) Sumps.

1. Secondary containment sumps shall be fabricated and installed in a manner that prevents release of liquids. These sumps shall be tested for leaks hydrostatically at installation, to the levels specified in subds. 2. to 4. , in accordance with the manufacturer's instructions and the requirements of this chapter, for a period of not less than 60 minutes.

2. To no less than 1 inch over the top of the highest penetration.

3. To no less than 1 inch over the top of any horizontal joint between wall sections.

4. To no lower than the top of any vertical joint.

(e) Installation checklist . Upon completion of any installation of new or replacement shop-built tanks or piping, or any system modification or upgrade that requires plan approval or registration or permitting, the certified installer shall provide the authorized agent or the department with a completed tank installation checklist, form ERS-6294 UST.

(7)   Repairs.

(a) General . Owners and operators of tank systems shall ensure that repairs will prevent releases due to structural failure or corrosion as long as the tank system is used to store regulated substances.

(b) Standards . Repairs to tank systems shall be made by the manufacturer's authorized representative or in accordance with a code of practice developed by a nationally recognized association or an independent testing laboratory that is acceptable to the department.

(c) Pipe repair and replacement . Metal pipe and fittings that have released product as a result of corrosion or other damage shall be replaced. Fiberglass pipe and fittings that have released product shall be replaced or repaired in accordance with the manufacturer's specifications.

(d) Tank-system site assessment . When repairs are made to piping or fittings that have released product to the environment, an assessment of the piping run, to identify points of release, shall be performed in accordance with ss. ATCP 93.575 to 93.585 .

(e) Precision tightness testing . Repaired tanks and piping shall have precision tightness testing in accordance with s. ATCP 93.515 (4) before being placed back into service.

(8)   Inspection and maintenance of ust systems. Operators of new and existing UST systems shall conduct routine and periodic inspection and maintenance in accordance with the applicable sections of PEI RP900.

(9)   Record keeping.

(a) General . Operators of new and existing underground storage tank systems shall maintain all of the following records:

1. Documentation of any system repairs, alterations or upgrades, including software and hardware upgrades, and any inspections required under this chapter.

2. Documentation demonstrating conformance with leak detection requirements, and the manner in which these claims have been justified or tested by the equipment manufacturer and certified installer, including all of the following:

a. Information pertaining to the leak detection system, including the material approval as issued under s. ATCP 93.130 that was valid when the system was installed; operator manual; warranty; and documentation verifying that the equipment has been installed, programmed and tested to perform as required in this chapter.

b. Testing results obtained from leak detection equipment, as retained from the equipment's printer or a hand-written log kept on site.

c. Documentation maintained for all calibration, inspection, monitoring, testing, repair, and annual performance verification of leak detection equipment permanently located on-site.

3. Response to and investigation of leak detection alarms.

4. Documentation maintained for all calibration, inspection, monitoring, testing, repair, and periodic performance verification of any corrosion protection equipment permanently located on-site.

5. Analysis from a corrosion expert of site corrosion potential if corrosion protection equipment is not used.

6. Records of any environmental information that has accrued for a site, such as from site inspections or investigations, phase I or II environmental site assessments, or repairs, or from tank-system site assessments conducted under ss. ATCP 93.560 to 93.585 .

7. Documentation of product inventory verification, at facilities that are subject to the requirements of ch. ATCP 94 .

8. Results of functional testing of impact and emergency shut-off valves.

9. Electrical continuity testing for dispensers of motor fuels that are Class I liquids.

10. One set of stamped, approved plans and specifications and a copy of the approval letter.

(b) Availability of records .

1. Operators shall maintain the required records at the site, except as provided in subds. 2. and 3. , and par. (c) 11.

2. Operators of unattended sites shall make the records available for inspection at the site when given 72 hours of prior notice.

3. The approved plans and specifications and approval letter shall be kept on site and available to the authorized agent or the department during all phases of installation. After installation is completed, the approved plans and specifications and approval letter shall be made available to the authorized agent or the department upon request.

4. Records may be kept electronically, provided they are in a format acceptable to the department.

(c) Maintenance of records . Records shall be maintained for the following periods from the date of the most recent test, inspection or upgrade:

1. Monthly leak detection monitoring — 1 year.

2. Annual precision tightness testing — 1 year.

3. Periodic precision tightness testing in association with inventory control — until the next test is conducted.

4. Impressed current corrosion protection system, 60-day inspection — the previous 3 inspections.

5. Corrosion protection system, annual test — the previous 3 tests.

6. Internal inspection associated with underground tank lining — 10 years.

7. Annual performance verification of leak detection equipment and flow restrictor — 2 years.

8. Results of functional testing of impact and emergency shut-off valves and electrical continuity testing for dispensers — 2 years.

9. The owner's manual provided by the leak detection equipment manufacturer — until the leak detection system is replaced or no longer used.

10. Any tank or pipe system modification or repair — the life of the system.

11. Inspection records — 3 years or the interval between required inspections, whichever is longer.

12. Tank-system site assessments and other environmental assessments, such as assessments for property transactions — 3 years after completion of any permanent closure, upgrade, repair or change in service. These records shall be maintained at one of the following locations:

a. With the owner or operator who took the UST system out of service.

b. With the current operator of the UST system site.

c. With the department if records cannot be maintained at the closed facility.

13. Leak detection alarm investigation — 2 years.

14. Product inventory verification in accordance with s. ATCP 93.503 , inventory control in accordance with s. ATCP 93.515 (2) , or statistical inventory reconciliation in accordance with s. ATCP 93.515 (6) — 10 years.

15. One set of stamped, approved plans and specifications and a copy of the approval letter — the life of the system.

CR 07-029 : cr. Register November 2008 No. 635 , eff. 2-1-09; CR 09-017 : am. (1) (b) 3., 4., (5) (a) 2. a., (f) 2., 3., (6) (b) 2. a. and (9) (c) 14. Register July 2009 No. 643 , eff. 8-1-09; correction in (2) (intro.), (3) (b), (c) 1., (6) (a) 1. b., 2., (b) 2. b., (c) 3., 4., (7) (d), (e), (9) (a) 2. a., 6., 7., (c) 14. made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 ; corrections in (2) (intro.), (3) (b), (c) 1., (6) (a) 2., (b) 2. b., (c) 3., 4., (7) (d), (e), (9) (a) 2. a., 6., 7., (c) 14. made under s. 13.92 (4) (b) 7. , Stats., Register October 2013 No. 694 .

Note

This section is coordinated with the federal Energy Policy Act of 2005, which addresses secondary containment for federally regulated tanks or piping installed within 1,000 feet of any community water system or any potable drinking water well, and which requires interstitial monitoring for any associated double-wall tanks or piping. Microsoft Windows NT 6.1.7601 Service Pack 1 See section ATCP 93.130 (5) for listing and labeling requirements for underground tanks. Microsoft Windows NT 6.1.7601 Service Pack 1 Piping elbows are an example of connections that do not need access because typically they do not need maintenance or inspection. Valves, extractor fittings, flex connectors, corrosion-protection test connections and overfill prevention devices are examples of connections that need this access. Microsoft Windows NT 6.1.7601 Service Pack 1 Underground fill piping is included in the piping that is addressed by this paragraph. Microsoft Windows NT 6.1.7601 Service Pack 1 The UL 971 standard meets this requirement. Microsoft Windows NT 6.1.7601 Service Pack 1 This subsection recognizes dispenser pans, spray-on liners, brushed-on liners, formed-in-place containment products, and other effective secondary containment practices that are currently in use. Microsoft Windows NT 6.1.7601 Service Pack 1 For further guidance, see the program letter at the following Web site: https://datcp.wi.gov/Pages/Programs_Services/PetroleumHazStorageTanks.aspx . Microsoft Windows NT 6.1.7601 Service Pack 1 Volumetric tests approved under section ATCP 93.130 at 90 percent capacity are acceptable under this section at 70 percent capacity in combination with the ullage test. Microsoft Windows NT 6.1.7601 Service Pack 1 Form ERS-6294 UST, Checklist for Underground Tank Installation, is available from the Bureau of Weights and Measures, PO Box 8911, Madison, WI 53708-8911, or at telephone [phone], or from the Bureau's Web site at https://datcp.wi.gov/Pages/Programs_Services/PetroleumHazStorageTanks.aspx . Microsoft Windows NT 6.1.7601 Service Pack 1 Section ATCP 93.140 (3) (c) requires the tank installation checklist to be submitted to the Department as part of the tank registration process. Microsoft Windows NT 6.1.7601 Service Pack 1 See NFPA 30A section 6.3.9.1 for testing requirements. Microsoft Windows NT 6.1.7601 Service Pack 1 Lifetime maintenance of upgrading records is required by 40 CFR 281.32 (e). Microsoft Windows NT 6.1.7601 Service Pack 1 All leak detection records should be retained permanently. The documentation could be helpful to exclude the site as a possible source of contamination at a later date. Microsoft Windows NT 6.1.7601 Service Pack 1 Section ATCP 93.870 has recordkeeping requirements for operator training, for USTs that are required to have a permit to operate from the department. Microsoft Windows NT 6.1.7601 Service Pack 1