Storm_Water.pdf

Storm Water

National Pollutant Discharge Elimination System (NPDES) Permit No.: CO-R 042004

Permit covers all areas of the Municipal Separate Storm Sewer System (MS4) within the exterior boundary of the Denver Federal Center.

Pertinent parts of the permit:

2.2. Public Education and Outreach on Storm water Impacts. The permittee must:

2.2.1. Continue an education and outreach program for the DFC which targets project contracting office representatives (CORs), project managers, building/property managers, and environmental staff;

2.2.3. At a minimum, produce and disseminate informational material to contracting officer representatives, project managers, contractors, building and property managers, tenants, and environmental staff of the effects of erosion and runoff on water quality.

Informational materials shall be updated and distributed as necessary throughout the duration of this permit, and should provide a location where all annual reports and/or SWMP updates as required by this permit may be viewed;

2.2.6. Within four years of the effective date of this permit, provide and document training to all planning staff and contracting officers to learn about Low Impact Development (LID) practices, green infrastructure practices, and to communicate the expectations for meeting pre-development hydrology within the context of the Energy and Independence Security Act of 2007. (See attached LID Training Presentation)

2.5. Construction Site Storm water Runoff Control. The permittee must:

2.5.4. Review the scope of work for all construction projects by environmental staff (e.g., the EPG) to assess whether proposed BMPs are realistic and to ensure compliance with the storm water construction permit requirements for developing a storm water pollution prevention plan;

2.5.5. Provide information on construction site BMPs with criteria for maintenance and installation. This may reference or incorporate documents which define how to install and maintain BMPs such as the Urban Drainage and Flood Control District Criteria Manual;

2.5.7. Provide training to contracting office representatives which perform daily inspections on a biannual basis regarding the maintenance and installation of Best Management Practices for construction storm water control and the terms of the construction storm water permit;

2.6. Post-construction Storm water Management for New Development and Redevelopment. The permittee must:

2.6.1. Include in contracts and requests for funding (e.g., a "prospective package") a requirement to design for and provide funding for the installation of permanent storm water control measures designed to retain, detain, infiltrate or treat runoff from newly developed impervious surfaces in a manner which mimics pre-development hydrology for all new projects and redevelopment which disturb greater than or equal to 5,000 square feet. Pre-development hydrology is defined in the SWMP. This should include a line item for costs associated with the installation and design of permanent storm water control measures along with a specific performance specification (i.e., maintaining pre-development hydrology) or BMP specification;

2.6.2. As part of the design review process for new and redeveloped construction projects disturbing equal to or greater than 5,000 square feet, review all contracts to ensure that they include permanent post-construction storm water control measures designed to retain, detain, infiltrate, or treat runoff from newly developed and redeveloped impervious surfaces in a manner which mimics pre-development hydrology;

2.6.3. Include or reference in the dig permit, applicable requirements and available guidance to design post-construction storm water features or low impact development practices designed to mimic pre-development hydrology;

2.6.4. When updated, include hydrologic performance specifications and information related to the design and maintenance of permanent storm water control measures in natural resource plans;

2.6.5. Develop and maintain a system to track the location, design, and maintenance specifications of permanent storm water features. This could be incorporated into a GIS system or other internal process such as the Facilities Maintenance Plan or the Denver Federal Center EMS and include post-construction BMP "as-builts" for all newly installed permanent storm water control measures in a georeferenced data management system;

2.6.6. Ensure that all newly installed post-construction storm water control measures are working as designed prior to closing out contracts;

2.6.7. Upon closeout of new construction projects, include maintenance requirements for newly installed permanent post-construction storm water control measures into a long-term maintenance plan; and

2.6.8. Ensure that permanent post-construction storm water control measures are included in any applicable warranty reviews.

- For construction, where greater than 1 acre is disturbed, contractor is required to file US EPA Notice of Intent (NOI) http://www.epa.gov/npdes/electronic-notice-intent-enoi

- GSA Storm water Training Website. Go to:

http://www.gsa.gov/portal/content/114575

2/3rds down the page, see “Storm Water Training” http://www.epa.gov/npdes/electronic-notice-intent-enoi http://www.gsa.gov/portal/content/114575