Alaska Department of Environmental Conservation Division of Water

Storm Water Engineering Plan Review (Letter of Approval) Submittal Requirements

Applicant, and applicant’s engineering representative contact information including: Organization Name, Contact Person, Mailing Address, Phone Number and Email Address

Project information including: Project Name, Project Street/Location, City, State [Alaska], Zip Code, Latitude, Longitude, Estimated Project Start Date, Estimated Project Completion Date, Estimated Total Project Area (Nearest tenth of an acre), Estimated Area to be Disturbed (Nearest tenth of an acre)

Discharge information including:

• Receiving Waterbody/Wetlands Name
• Identify if the receiving waterbody is on the Impaired Waters List (303d list)
• Estimated Distance from Waterbody to Project Site

Plan review checklist information including: (Note: Detailed narrative answers to the checklist questions should be provided in the Engineering Stormwater Submission Cover Letter.)

1. Legal description of site
2. Vicinity Map
3. Project narrative including:
1. Purpose of project
2. Impact of development on site hydrology and stormwater quality
3. Description of stormwater management system
4. Rationale for selection of stormwater treatment practices
4. Description of runoff flows down to the discharge point(s)
5. Treatment System’s maintenance procedures
6. Describe existing and proposed topography
7. Delineate Drainage Areas and Flow Paths
8. Describe type and location of storm water management practice(s)
9. Describe predominant soils type(s)
10. Existing land cover/land use and the proposed limits of disturbance
11. Identify Resource Protection Areas (e.g. sensitive streams, wetlands and lakes)
12. Identify stream buffer or setbacks
13. Identify existing and proposed roads, buildings and other structures
14. Identify snow storage and disposal locations
15. Provide storm water treatment system design and calculations
16. Make sure all engineering design and calculations are stamped by Alaska licensed engineer [18 AAC 72.990(29)]

NOTE: For projects using oil and grit separators to obtain an ADEC letter of non-objection for discharge to storm sewers, an applicant must demonstrate that their proposed oil and grit separator has the ability to remove at least 50 percent of particles 20 micron in size from storm water runoff during the 2-year, 6-hour rain event.