The requirements in Sector L apply to stormwater discharges associated with industrial activity from landfills and land application sites as identified by the industrial activity code specified in Table 5 of Appendix D.
a. Waste disposal at landfills.
b. Land application sites.
c. Sites subject to regulation under Subtitle D of RCRA.
The following discharges are not authorized by this permit:
b. Gas collection condensate.
c. Drained free liquids.
d. Contaminated and non-contaminated groundwater.
e. Wastewater from recovery wells.
f. Sanitary wastewater.
g. Laboratory wastewater.
h. Contact washwater from washing truck and railcar exteriors and surface areas that have come in direct contact with solid waste at the landfill facility.
a. Contaminated stormwater -stormwater that comes in direct contact with landfill wastes, the waste handling and treatment areas, or landfill wastewater as defined in 4.c of this Part. Some specific areas of a landfill that may produce contaminated stormwater include, but are not limited to, the open face of an active landfill with exposed waste (no cover added); the areas around wastewater treatment operations; trucks, equipment, or machinery that has been in direct contact with the waste; and waste dumping areas.
b. Drained free liquids -aqueous wastes drained from waste containers (e.g. drums) prior to landfilling.
c. Landfill wastewater -all wastewater associated with, or produced by, landfilling activities except for sanitary wastewater, non-contaminated stormwater, contaminated groundwater, and wastewater from recovery pumping wells. Landfill process wastewater includes, but is not limited to, leachate; gas collection condensate; drained free liquids; laboratory-derived wastewater; contaminated stormwater; and contact washwater from washing truck, equipment, and railcar exteriors and surface areas that have come in direct contact with solid waste at the landfill facility.
d. Leachate -liquid that has passed through or emerged from solid waste and contains soluble, suspended, or miscible materials removed from such waste.
e. Non-contaminated stormwater -stormwater that does not come in direct contact with landfill wastes, the waste handling and treatment areas, or landfill wastewater as defined in 4.c of this Part. Non-contaminated stormwater includes stormwater that flows off the cap, cover, intermediate cover, daily cover, and/or final cover of the landfill.
a. Employee Training (No additional requirements).
b. Erosion and Sedimentation Control.
The Permittee shall implement sediment control practices on all down-gradient perimeters before any up-gradient land disturbing activities begin. These practices shall remain in place until final stabilization has occurred. The Permittee shall provide temporary stabilization (e.g. temporary seeding, mulching, and placing geotextiles on the inactive portions of stockpiles) for the following:
1. Materials stockpiled for daily, intermediate, and final cover.
2. Inactive areas of the landfill.
3. Landfills areas that have final cover but where vegetation has yet to be established.
4. Land application sites where waste application has been completed but final vegetation has not yet been established.
c. Good Housekeeping.
The Permittee shall provide protected storage areas for pesticides, herbicides, and fertilizers.
The Permittee shall ensure the following areas are inspected while conducting inspections as required by Part III.G, of the permit.
1. Areas of landfills that have not yet been finally stabilized.
2. Active land application areas, areas used for storage of material and wastes that are exposed to precipitation, stabilization, and structural control measures.
3. Leachate collection and treatment systems.
4. Locations where equipment and waste trucks enter and exit the site.
5. Inactive landfills for stabilization and structural erosion control measures, leachate collection and treatment systems, and all closed land application areas.
e. Preventive Maintenance Program.
The Permittee shall maintain the following:
1. All containers used for outdoor chemical and significant materials storage.
2. All elements of leachate collection and treatment systems, to prevent commingling of leachate with stormwater.
3. The integrity and effectiveness of any intermediate or final cover (including repairing the cover as necessary), to minimize the effects of settlement, sinking, and erosion.
f. Spills and Leaks (No additional requirements).
g. Management of Runoff (No additional requirements).
h. Other Industry Specific Stormwater Control Measures (No additional requirements).
In addition to the requirements of Part IV of the permit, the Permittee shall also comply with the following:
a. Facility Map.
The Permittee shall identify where any of the following may be exposed to stormwater:
1. Active and closed landfill cells or trenches.
2. Active and closed land application areas.
3. Locations where open dumping is occurring or has occurred.
4. Locations of any known leachate springs or other areas where uncontrolled leachate may commingle with runoff.
5. Leachate collection and handling systems.
b. Inventory of Exposed Materials (No additional requirements).
c. Potential Pollutant Sources.
The Permittee shall describe the following sources that have potential pollutants associated with them:
1. Fertilizer, herbicide, and pesticide application.
2. Earth and soil moving.
3. Waste hauling and loading or unloading.
4. Daily, interim, and final cover material stockpiles as well as temporary waste storage areas.
5. Exposure of active and inactive landfill and land application areas.
6. Uncontrolled leachate flows.
7. Failure or leaks from leachate collection and treatment systems.
d. Description of Stormwater Controls (No additional requirements).
Sector-Specific Benchmark Values and Effluent Limitations: Sector - L. Discharges may be subject to requirements for more than one sector or subsector.
Link to this table
|Subsector||Parameter||Benchmark Values||Effluent Limits|
|L1 Municipal Solid Waste Landfill (MSWLF) Areas Closed In Accordance With 40 CFR 258.60||Solids, Total Suspended (TSS)||100 mg/L 2||Effluent Monitoring Not Required|
|L2 Any Open Or Closed Non-Hazardous Waste Landfills And Land Application Sites, Which Do Not Discharge To Surface Water(s), Stormwater That Has Directly Contacted Solid Waste.||Solids, Total Suspended (TSS)||100 mg/L 2||Effluent Monitoring Not Required|
|Iron, Total (as Fe)||1.0 mg/L||Effluent Monitoring Not Required|
|L3 3 Any Landfill That Discharges To Surface Water(s), Stormwater That Has Directly Contacted Solid Waste (pursuant to 40 CFR pt. 445, subp. B.)||BOD, Carbonaceous 05 Day (20 Deg C)||25 mg/L||140 mg/L daily maximum|
|37 mg/L calendar month average|
|Solids, Total Suspended (TSS)||100 mg/L 2||88 mg/L daily maximum|
|27 mg/L calendar month average|
|Nitrogen, Ammonia, Total (as N)||2.8 mg/L||10 mg/L daily maximum|
|4.9 mg/L cal|
|Alpha-Terpineol||Benchmark Monitoring Not Required||0.033 mg/L daily maximum|
|0.016 mg/L calendar month average|
|Benzoic acid||Benchmark Monitoring Not Required||0.12 mg/L daily maximum|
|0.071 mg/L calendar month average|
|P-Cresol||Benchmark Monitoring Not Required||0.025 mg/L daily maximum|
|0.014 mg/L calendar month average|
|Phenol||Benchmark Monitoring Not Required||0.026 mg/L daily maximum|
|0.015 mg/L calendar month average|
|Zinc, Total (as Zn)||0.234 mg/L 1||0.20 mg/L daily maximum|
|0.11 mg/L calendar month average|
|pH||6.0-9.0 SU 4||6.0 SU, instantaneous minimum 9.0 SU, instantaneous maximum|
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.
3As set forth at 40 CFR Part 445 Subpart B, these numeric limitations apply to contaminated stormwater discharges from MSWLFs that have not been closed in accordance with 40 CFR 258.60, and to contaminated stormwater discharges from those landfills that are subject to the provisions of 40 CFR Part 257 except for discharges from any of the following facilities:
4For purposes of benchmark pH monitoring, the Permittee is required to report instantaneous results only, and not a calculation of pH averages. pH measurements are logarithmic, and the Agency will be performing a logarithmic average for this parameter using the instantaneous results submitted.
8. Use of Infiltration Devices and/or Industrial Stormwater Ponds for Stormwater Treatment and Disposal
Sector L industrial facilities are authorized to use designed infiltration devices or industrial stormwater ponds for stormwater management.