SECTION: 33 40 00 STORM DRAINAGE UTILITIES

 

Criteria

  1. JBLM Stormwater Design Guidance available at the JBLM Stormwater Website.
  2. UFGS SECTION 33 40 00  STORM DRAINAGE UTILITIES
  3. Underground Injection Control (UIC) program: Chapter 173-218 WAC; See also JBLM Stormwater Design Guidance on UIC wells.
  4. WA State Department of Ecology Stormwater Management Manual for Western Washington and/or WSDOT Aviation Stormwater Design Manual, as applicable. 
  5. Permit No. WAS-026638, Stormwater Discharges from Small Municipal Separate Storm Sewer System (MS4), individual permit to JBLM
  6. Permit No. WAR05000F, Nationwide Multi-Sector General Permit (MSGP), Discharges from Industrial Facilities.
  7. 2017 Nationwide Construction General Permit (CGP), Discharges from Construction Activities for sites disturbing over 1 acre.

 

Changes or Criteria Notes to Unified Facilities Guide Specifications (UFGS)

Paragraph # and Title (if any)

Note to Designer

Change Text

1.3   SUBMITTALS

SD-01 Preconstruction Submittals

Add this paragraph:

Pre-construction Registration Form for Underground Injection Control Well

 

Plastic Fencing; S

 

Plastic fencing must meet recycled content requirements (https://sftool.gov/greenprocurement/green-products/12/park-recreation/202/plastic-fencing/0) per 01 33 29 SUSTAINABILITY REPORTING.

1.3   SUBMITTALS

SD-11

Add this paragraph:

Plastic Fencing; S

1.5   Underground Injection Control Wells

Add this paragraph:

Underground Injection Control Wells

 

Most Class V Underground Injection Control (UIC) wells must be registered with the Washington State Department of Ecology.  UIC wells that do not require registration are wells that are exempt from the UIC well status as stated in WAC 173-218-050.  UIC wells at single-family homes that only receive residential roof runoff or are used to control basement flooding are exempt from registration.  

 

Registration information required by the Department of Ecology must be provided to Public Works Water Program, BLDG 2012 Room 323 for registration with Ecology.  Registration forms are available for single and multiple sites and can be obtained from Public Works Water Program or the Department of Ecology UIC program website.

 

Wells must be registered prior to construction.  Once registration forms are submitted a 60-day wait period starts.  After the 60-day wait period the well is considered registered and authorized for installation.

3.2 Bedding

Add

Bedding material shall be as specified in WSDoT Standard Plans B-55.20-02 Pipe Zone Bedding and Backfill including linked requirements to WSDoT Standard Specifications.

 

Design Requirements

  1. Use the JBLM Stormwater Design Guidance to ensure permit compliance. The LID form is required for all new stormwater facilities. See the JBLM Stormwater website for guidance documents.
  2. Registration of all proposed UIC wells must be completed 60 days prior to construction. The stormwater program manager must be contacted during the design phase in order to complete registration.
  3. Stormwater Management (SWM) Systems.
    1. The Government’s Consultant or Contractor designers are responsible for design, development, and installation of all stormwater facilities at their respective sites.
    2. Joint Base Lewis-McChord (JBLM) has been issued a Small Municipal Separate Storm Sewer System (MS4) permit (WAS-026638) for stormwater discharges. The permit requires any new development or redevelopment disturbing more than 5,000 square feet to develop a Stormwater Site Plan. Use the JBLM Stormwater Design Guidance document to ensure MS4 permit compliance. The Washington Department of Ecology Stormwater Management for Western Washington (Stormwater Manual) or Aviation Stormwater Design Manual shall be used for BMP selection. The Drainage Plan or Site Plan shall be submitted to the JBLM Systems Manager and Stormwater Program Manager for review.  Guidance documents are available from the PW Environmental Division Stormwater Program to assists the designer in meeting the permit requirements.
    3. Management of stormwater must be integrated into other project aspects to meet the sustainability goals of the installation as a whole. Design stormwater systems to maintain the hydrologic functions of the site. Consider reusing stormwater on site for irrigation and landscaping. This contributes to the installation’s water savings and reuse goals.
    4. Design and size stormwater facilities to accommodate stormwater runoff from all site development surfaces and all runoff from buildings in conformance with the latest adopted edition of the Ecology stormwater manual.  Design goals should be to reduce or eliminate offsite stormwater flows and restore the pre-development hydrology of the project area. Designs must meet all of the requirements below.
      • The designs must comply with Section 438 of the Energy Independence and Security Act (EISA) by following NPDES MS4 Permit No. WAS-026638.
      • Fence all standing water facilities with side slopes exceeding 3h:1v for safety. Complete all standing water facilities with a minimum of 6 inches of topsoil and plantings appropriate for the pond function.
      • Within housing, commercial, and organizational areas, ponds cannot be constructed with side slope exceeding 3h:1v or deeper than 2.5 feet.
      • All ponds, swales, or other like stormwater features must be vegetated and/or have amended soils added to provide appropriate function.
      • All ponds, swales, or other like stormwater features shall blend with project landscaping to the maximum extent practicable.
      • Storm drain lines and branches within the site shall be polyvinyl chloride (PVC) plastic, ductile-iron, CPEP, or HDPE pipe.
      • Infiltration rates (including topsoil and vegetation), amended or on-site soils mixes, and seed mixtures should all be addressed in the design.
      • Whenever possible, shrub beds, street plants, and similar features shall be used through rain garden type features for stormwater runoff management.
    5. Onsite treatment and infiltration: Use the Stormwater Manual and the Low-Impact Development Technical Manual for Puget Sound.  Request any exceptions for approval by JBLM PW. However, consider the portions of Section 3.3 of Volume III of the Stormwater Manual pertaining to the methods for determining infiltration rates as a recommended guideline. Conduct on-site soil tests in conformance with standard engineering practices and to the satisfaction of JBLM PW. Use the soil tests to determine a short-term infiltration rate. Once determined, apply appropriate factors of safety in conformance with standard engineering practices to the short-term infiltration rate to arrive at a long-term design infiltration rate based on site conditions, in conformance with the designer’s professional opinion and discretion, and the approval of JBLM PW, prior to full design. Include detailed information in the design regarding amended soil mixtures, soil depths, vegetation requirements and seed mixtures for all stormwater management features.
      • JBLM prefers stormwater infiltration methods that are small, distributed throughout the project site, and as visually unobtrusive as possible. Preferred methods include elements such as car parks, rain gardens, porous pavement, cisterns, or other low-impact development elements.
      • Use pervious pavements to infiltrate stormwater for parking areas in housing, commercial, and organizational areas that are not subject to industrial activities or high traffic. If there is runoff that the pervious pavement cannot infiltrate, use car parks or rain gardens to infiltrate this runoff. Car parks shall meet the car park standard for landscape and shading.
      • Use sheet flow runoff to infiltration features to the maximum extent practicable. Consider safety when sheet flowing large amounts of runoff.
    6. The use of underground injection control for stormwater management must meet the requirements of Chapter 173-218 of the Washington Administrative Code (WAC) Underground Injection Control (UIC) Program. Submit completed registration forms to the JBLM Stormwater Office for registration with Ecology 65 days prior to any construction of UIC facilities. Obtain registration forms and any further information from the JBLM Environmental Division.
    7. Low-impact development techniques shall comply with the Low Impact Development Technical Guidance Manual for Puget Sound Erosion and Sediment Control. Provide appropriate erosion and sediment controls on all construction sites that will have ground disturbance. Proper implementation and maintenance of appropriate best management practices (BMPs) is critical to control any adverse water quality impacts from construction activities adequately. Discharges must not violate the state’s surface water quality standards (WAC Chapter 173-201A) and groundwater quality standards (WAC Chapter 173-200).
    8. Volume II, Chapter 4 of the Stormwater Manual provides standards and specifications for BMPs during construction that are approved for use on JBLM. Consider other BMPs with proper review and approval by JBLM PW.
    9. Erosion and sediment control measures at construction sites less than 5,000 square feet may be documented in the Environmental Protection Plan.
    10. Submittal of a site-specific Storm Water Pollution Prevention Plan (SWPPP) is required for construction activities that will have a land disturbance of 5,000 square feet or more.  For sites that disturb an acre or more, the Construction SWPPP shall to be submitted to the JBLM PW Stormwater Manager for approval. Templates for SWPPPs are available on the JBLM Stormwater Website.
    11. Construction sites that will have a land disturbance of one or more acres (or are part of a common plan of development that will disturb an acre or greater) or projects that have multiple construction sites under one contract if the total land disturbance for all sites is greater than one acre, must be covered under the EPA’s NPDES Construction General Permit (CGP). A Notice of Intent must be submitted to EPA a minimum of 14 days before starting work. A completed Permit Application shall be submitted to the Stormwater Program Manager prior to submittal to EPA. Anticipate up to 2 weeks for review for each submittal or re-submittal.
    12. Bioretention Facilities: In addition to following the Temporary Erosion and Sediment Control (TESC) guidance in SWMMWW BMP T7.30, BMP C103: high visibility plastic fence shall be implemented during construction around bioretention facilities until final stabilization has been met in accordance with the National Pollutant Discharge Elimination System General Permit For Discharges from Construction Activities definition in section 2.2.14.b.

 

 

Notes to Designers on Drawing Content

  • Site maps must meet requirements of the JBLM Stormwater Design Guidance.  
  • All stormwater facility and TESC BMPs must be labeled using the appropriate number from the Stormwater Management Manual for Western Washington or Aviation Stormwater Design Manual.

 

Standard Details

 

 

Applicable Points of Contact

Design Standards