Saturday, April 4, 2009

Landfill Sector - SWPPP - Stormwater Permit Proposed Requirements

On July 6, 2009, the Minnesota Pollution Control Agency released its proposed multisector industrial stormwater discharge general permit. This permit, once promulgated, will replace the existing industrial stormwater permit, which expired in October of 2002.

[Read a summary of the overall Minnesota permit, stormwater monitoring, and sector requirements]

Caltha LLP will be conducted seminars on the proposed sector requirements in July & August 2009. Caltha MPCA Industrial Stormwater Permit Requirements Seminars

The proposed permit details requirements for 29 different industrial sectors. The requirements described below are proposed for the Landfills, Land Application Sites, and Open Dumps Sector (Sector L). Sector L includes waste disposal at landfills, land application sites, and open dumps that receive or have received industrial waste, including sites subject to regulation under Subtitle D of RCRA. These requirements are in addition to permit requirements that apply to all sectors.

The facility must inspect all active operating landfills, open dumps, and land application sites at least once every 7 days, including areas of landfill that have not yet been finally stabilized; active land application areas, areas used for storage of material and wastes that are exposed to precipitation, stabilization, and structural control measures; leachate collection and treatment systems; and locations where equipment and waste trucks enter and exit the site. Inspections must nsure that sediment and erosion control measures are operating properly.

Erosion and Sediment Control:
The facility must implement sediment control practices on all down gradient perimeters before any upgradient land disturbing activities begin. These practices should remain in place until final stabilization has occurred. Sites must also provide temporary stabilization for the following: materials stockpiled for daily, intermediate, and final cover; inactive areas of the landfill or open dump; landfills or open dump areas that have gotten final covers but where vegetation has yet to establish itself; and land application sites where waste application has been completed but final vegetation has not yet been established.

Good Housekeeping:
The operation must provide protected storage areas for pesticides, herbicides, and fertilizers.

Preventive Maintenance:
Sites must maintain the following: all containers used for outdoor chemical and significant materials storage; all elements of leachate collection and treatment systems, to prevent commingling of leachate with stormwater; 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.

Industry Specific Control Measures:
The operation must implement a tracking system for the types of wastes disposed of in each cell or trench of a landfill or open dump. For land application sites, track the types and quantities of wastes applied in specific areas.

Stormwater Monitoring Benchmarks:
All facilities are required to conduct visual and chemical (benchmark) monitoring. For benchmark monitoring, the benchmark concentrations or values depend on facility type:

All Landfill, Land Application Sites and Open Dumps:
TSS 100 mg/L

All Landfill, Land Application Sites and Open Dumps, except Municipal Solid Waste Landfill (MSWLF) Areas Closed in Accordance with 40 CFR 258.60:
TSS 100 mg/L
Total Iron 1.0 mg/L

All Landfills Subject to the Requirements of 40 CFR Part 445 Subpart B:
TSS 100 mg/L
BOD 25 mg/L
Total Ammonia 34.8 mg/L
Total Zinc 0.234 mg/L
pH 6-9

Note: Benchmarks for iron, zinc and ammonia were derived based on the Aquatic Life Standards for these parameters in Minnesota Rules.

[Read more about use of Aquatic Life Standards to derive stormwater benchmarks]
[Read more about how benchmarks are used under the proposed MPCA industrial permit]
[Read more about what a 100 mg/L benchmark for TSS relates to]

Looking for other sector information? Click here for a link to all sector requirements

Caltha LLP provides expert consulting services to public and private sector clients nationwide to address Stormwater Permitting & Regulatory Support, Stormwater Pollution Prevention Plans (SWPPP), Stormwater Monitoring and Stormwater Training.

For further information contact Caltha LLP at
Caltha LLP Website

No comments: