M. Automobile Salvage Yards

1. Authorized Stormwater Discharges

The requirements in Sector M apply to stormwater discharges associated with industrial activity from automobile salvage yards as identified by the industrial activity code specified in Table 5 of Appendix D.

2. Industrial Activities Authorized by Sector M

Permittees under Sector M are primarily engaged in the dismantling or wrecking of used motor vehicles for parts recycling or resale and scrap.

3. Limitations on Authorization (No Additional Limitations)

4. Sector-Specific Definitions (No Additional Definitions)

5. Stormwater Controls

a. Employee Training.

The Permittee shall address the following areas in the employee training program: proper handling (collection, storage, and disposal) of fuels, oil, used mineral spirits, antifreeze, mercury switches, refrigerants, and solvents.

b. Erosion and Sedimentation Controls (No additional requirements).

c. Good Housekeeping.

To the maximum extent feasible, the Permittee shall:

1. Store all batteries indoors.

2. Recycle lead battery cable ends and wheel balancing weights.

3. Remove all fluids from vehicles and recycle or dispose of accordingly.

4. Remove and segregate mercury switches and mercury containing devices.

5. Recycle fuels.

6. Remove and dispose of refrigerants as required with complete avoidance of venting to atmosphere.

7. Remove and dispose of glycols as required.

8. Remove and recycle all lead parts.

9. Separate and recycle plastics if feasible, or dispose as solid waste.

10. Store all engines and transmissions (that have been removed from vehicles) in covered areas not exposed to precipitation.

d. Inspections.

1. The Permittee shall immediately inspect vehicles arriving at the facility. The Permittee shall inspect the following for signs of leakage; all equipment containing oily parts, hydraulic fluids, any other types of fluids, and mercury switches. Also inspect all vessels and areas where hazardous materials and general automotive fluids are stored, including, but not limited to, mercury switches, brake fluid, transmission fluid, fuels and oils, refrigerants, and antifreeze.

2. In addition to the inspection requirements outlined in Part III.G, the Permittee shall ensure that a total of two (2) of the required monthly inspections occur during runoff events, with at least one being performed during snow melt. Each inspection shall include a visual assessment of the runoff to identify any visible sheens or films that indicate the presence of oil or grease in the discharge. If sheens are present in stormwater discharges, corrective actions to prevent sheen shall be implemented and documented in the SWPPP.

The Permittee is only required to conduct visual inspections of runoff originating from, or passing through, areas of industrial activity and/or significant materials. Any runoff that does not contact industrial activity and/or significant materials (e.g. office buildings, employee parking lots, natural areas, etc) is not required to be inspected.

e. Preventive Maintenance (No additional requirements).

f. Spills and Leaks.

The Permittee shall drain vehicles of all fluids before storage in the facility yard or before vehicles are crushed. If vehicles arrive at the facility with leaks, the Permittee shall either eliminate or contain the leak immediately to prevent stormwater contamination.

g. Management of Runoff (No additional requirements).

6. SWPPP Requirements

In addition to the requirements of Part IV, the Permittee shall also comply with the following:

a. Facility Map.

The Permittee shall indicate the location of the following areas:

1. Dismantling areas.

2. Motor vehicle part storage areas (e.g. engine blocks, transmissions, radiators, tires, batteries, etc).

3. Vehicle part maintenance areas.

b. Inventory of Exposed Materials (No additional requirements).

c. Potential Pollutant Sources.

The Permittee shall assess the potential for the following to contribute pollutants to stormwater discharges:

1. Vehicle storage areas.

2. Dismantling areas.

3. Parts storage areas (e.g. engine blocks, tires, transmissions, batteries).

4. Fueling stations.

d. Description of Stormwater Controls (No additional requirements).

7. Monitoring and Reporting Requirements

In accordance with the monitoring requirements of Part V, the Permittee shall monitor the applicable parameters in Table M-1, below:

Sector-Specific Benchmark Values and Effluent Limitations: Sector - M. Discharges may be subject to requirements for more than one sector or subsector.
Link to this table

Subsector Parameter Benchmark Values
M1 Automobile Salvage Yards Solids, Total Suspended (TSS)) 100 mg/L 2
Aluminum, Total (as Al) 1.5 mg/L
Iron, Total (as Fe) 1.0 mg/L
Lead, Total (as Pb) 0.164 mg/L 1
Benzene 9.0 mg/L
Toluene 3.7 mg/L
Ethyl benzene 2.7 mg/L
Xylene 2.8 mg/L

1The benchmark values of some metals are influenced by water hardness. For these parameters, the Permittee may determine the hardness of the stormwater discharges to identify the applicable ‘hardness range’ for determining their benchmark value. See Table 4 of Appendix B for hardness dependent benchmark values in accordance with Minn. R. 7050.0222 and Minn. R. 7052.0100.
2If the Permittee is required to comply with Appendix A, part F.1, the benchmark value for Solids, Total Suspended (TSS) is 65 mg/L, instead of 100 mg/L.

8. Use of Infiltration Devices and/or Industrial Stormwater Ponds for Stormwater Treatment and Disposal

a. Industrial Stormwater Ponds

1. The Permittee of a sector M industrial facility is authorized to use industrial stormwater ponds for stormwater management provided that any industrial stormwater pond constructed after the effective date of this permit meets the following design criteria. Any Permittee required to comply with this part is not authorized to utilize the benchmark monitoring waiver described in [[PART V. BENCHMARK MONITORING REQUIREMENTS#6. Benchmark Monitoring Waivers|Part V.B.6.a] of the permit.

a. The industrial stormwater pond must be lined with a synthetic liner that is chemically compatible with materials expected to enter the pond, must be Ultra Violet (UV) stable, and must be designed to restrict infiltration to less than 500 gallons per acre per day.

b. The industrial stormwater pond must be designed in accordance with accepted engineering practices. (See MPCA “Recommended Pond Design Criteria” December 2009, Document number: wq-wwtp5-53 and any applicable supporting technical criteria)

b. Infiltration Devices

1. The Permittee of a sector M industrial facility is authorized to use a designed infiltration device, implemented prior to the effective date of this permit, for stormwater management provided the Permittee complies with the following requirements:

a. The Permittee shall conduct benchmark monitoring in accordance with the terms and conditions of Part V of all industrial stormwater prior to infiltration. However, any Permittee required to comply with this part that is using a designed infiltration device to manage industrial stormwater is not authorized to utilize the benchmark monitoring waiver described in Part V.B.6.a of the permit.

b. If the Permittee has a designed infiltration device operating prior to the effective date of this permit, the Permittee is authorized to continue using that device. However, on or after the effective date of this permit, the Permittee is not authorized to construct new infiltration devices, expand infiltration activities or practices that result in infiltration, or expand volume of infiltration.

9. Mercury Minimization Plan

a. All vehicle recyclers and vehicle scrap processors shall remove and manage and recycle mercury containing convenience lighting switch assemblies, mercury containing ABS switch assemblies, and mercury containing air bag sensor switch assemblies found in some vehicles manufactured before model year 2002. Under Minn. Stat. 116.92, subd. 4(c), “A person may not crush a motor vehicle unless the person has first made a good faith effort to remove all of the mercury switches in the motor vehicle.”

b. In addition, the Permittee shall also evaluate the facility to identify any additional sources of mercury that may be introduced to, or used at, the facility. This includes, but is not limited to, mercury containing devices such as float switches; tilt switches; manometers; barometers; batteries; flame sensors (diostats); hydrometers; medical devices; lamps; mercury compounds; pyrometers; displacement relays; wetted reed relays; thermometers; pressure gauges; thermostats; etc. The plan shall describe how the Permittee is removing mercury containing devices, segregating mercury containing devices to avoid spills and contact with stormwater, and the methods used for recycling any mercury generated at the facility (including the specific recycling program used). All mercury and mercury-containing devices must be removed and recycled in accordance with Minn. Stat. §§ 115A.932 and 116.92 and in accordance with state and federal Universal Waste Rules and other applicable water, air, and waste regulations.

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