NIH Stormwater Management Program

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NIH Stormwater Management Program

• A variety of projects

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Stormwater, Why do we care?

• http//www.youtube.com/watch?v2Sxwl_SOSAQ

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The NIH Campus

• The NIH research facility occupies a 310 acre
  adjacent to the Bethesda CBD and residential
  neighborhoods. It contains two distinct storm
  water drainage areas.

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NIH Campus Disharges to Stormwater

• Campus Stormdrains
• NIH Power Plant
• Exterior Water Usage
• Grounds keeping
• Construction sites
• Hydrant Testing

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National Pollutant Discharge Elimination System
(NPDES)

• Federally mandated by the Environmental
  Protection Agency (EPA) under the Clean Water Act
• Maryland Department of the Environment has
  implementation authority
• Originally regulated POINT SOURCE end of pipe
  discharges from locations such as sewage
  treatment plants and industrial facilities
• Broadened to Address NON-POINT SOURCES -
  pollution from stormwater runoff spread out over
  large areas - Medium and Large urban areas,
  construction activity disturbing 5 acres of land
  or greater, categorical industrial

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NIH NPDES Phase II General Permit Requirements

• SIX best management practices (BMPs) to be
  implemented and measurable goals for each,
• public education and outreach
• public participation and involvement
• illicit discharge detection and elimination
• construction site runoff control
• post-construction runoff control and
• pollution prevention/good housekeeping

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NIH Best Management Practices
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1) Public education and outreach
2) Public participation and involvement
Earth Day at NIH includes stream tours
Along with other activities that showcased the
NIH environmental efforts.
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3) Illicit Discharge Detection

• The DEP staff monitors the headwalls along the
  stream as well stormwater lines around campus for
  signs of water pollution coming through the system

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4) Weekly Inspections of Sediment Erosion
Control Measures.

• Each week, NIH/DEP staff conduct inspections of
  all potential sources of sediment pollution and
  possible erosion spots along all construction
  projects.

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5) post-construction runoff control
Low Impact Development Stormdrain
Map and Maintain Existing BMPs
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6) Pollution prevention/good housekeeping
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Best Management Practices for the NIH Campus

• Existing
• Stormwater Stuctures (Natcher Bldg, Metro
  Station, NLM, Day Care)
• Sediment Basin at NIH Stream Outfall
• Underground Stormwater Management Structure
  (behind MLP-10)
• Wilson Lane Frog Pond Streamside sand filters
• Stormceptors at MLP 9 and Bldg 33
• Bldg 1 underground sand filters
• Curbless Gutters (Wilson Lane, East Drive)
• Reduction in impermeable surfaces (Multi-level
  Parking Structures)
• Reforestation/No-mow habitat areas
• Sand and Ice-Melt (Magnesium chloride) instead
  of Salt for Ice/Snow
• Improved Hydrant Flushing Practices
• Tree Box Filter
• Green Roof at NIH Visitor Center
• Upcoming
• NIH South Pond

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NIH Bethesda Stormwater Management Plan

• Plan addresses improvement to water quality and
  reduction in water runoff speed
• Plan eventually provides credits for future
  projects
• Three major projects conducted to accrue credits
• Revitalize NIH stream
• Underground structure for CRC (water speed)
• Montgomery County to build Stony Creek Pond

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Ultimate GOAL Protect the tributaries of the
Chesapeake Bay Watershed
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The NIH Stream

• The NIH Stream is the main storm water outfall
  for the NIH campus. It collects drainage from
  over 210 acres of the campus.

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The NIH Stream Restoration Project

• In 2003, NIH began work on a project designed to
  restore the main stormwater outlet for the
  campus, the NIH Stream. This project upgraded
  the water quality of the stream, and improved the
  aesthetics of the campus for all employees. The
  project was completed in 2004.

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NIH Stream Pedestrian Bridge
February 20th, 2004
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NIH Stream Pedestrian Bridge
August 4th, 2006
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NIH Stream Pool
February 20th, 2004
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NIH Stream Pool
August 4th, 2006
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NIH Stream North
January 12, 2004
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NIH Stream North
August 4th, 2006
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Pool Areas
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Retention Filter Wilson Drive
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Retention Pond 2006
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Northeast Stormwater Control
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North Underground Storage Structure
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Retention Structure Construction
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STONEY CREEK POND BACKGROUND

• Primary Project Objectives
• To restore water quality and stream habitat in
  lower Rock Creek by
• Reducing stormwater flow rates to address stream
  bank erosion
• Improving runoff water quality from downtown
  Bethesda
• Contribute to meeting a portion of the
  requirements listed in the NIH Campus-wide Master
  Plan
• Construction funds available under a County/State
  matching grant under TEA-21
• 204-Acre drainage area to the pond site

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Stony Creek Pond - Continued

• Project required close coordination among a
  variety of partners
• Montgomery County
• NIH
• Utility companies
• State of Maryland
• Community

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DESIGN FEATURES

• Permanent water surface area will cover 1.3
  acres with maximum depth of 6 feet
• 1 year storm event (frequent storm event)
  water surface area will cover 1.7 acres
• Maximum water surface area during large
  storms (100 year storm event) will cover 3.3
  acres
• Reduce peak flows from the 6- month storm to
  pre-developed conditions
• Significant peak flow reductions will also be
  made for the 1-year storm (which has the greatest
  impact in reducing stream bank erosion downstream
  of the pond)

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DESIGN FEATURES

• Two underground trash and oil collection devices
  will capture trash and oil washing through the
  Bethesda storm drain system
• Safety bench along the ponds edge will ensure
  shallow
• water ( 6-12) along the shoreline
• Landscaping with native trees, shrubs, herbaceous
  plants,
• grasses, and wetland vegetation will help
  to support a
• diverse and balanced ecosystem. Will
  try to reuse Cypress locally.
• Landscaping strategies recommended by the
  Maryland
• Department of Natural Resources When
  Resident Geese Become a Problem will be
  incorporated to discourage geese

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DESIGN FEATURES

• Aerators are planned to increase water
  circulation to enhance water quality and
  predatory insect populations
• DEP will introduce native fish and aquatic
  organisms to assist in creating a balanced
  ecosystem
• DEP will monitor and perform regular maintenance
• Proposed primary construction access will be from
  southbound exit lane for Woodmont Avenue
• The construction contractor will be required to
  follow the Montgomery County Noise Ordinance,
  Section 31 (b) of the County code. Work hours
  during construction are between the daytime hours
  of 700 a.m. to 500 p.m.

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PROJECT STATUS TentativeUpdated pfister May
2008

• Pending Final Design Review with NIH and
  Permitting Agencies Complete
• Plan Signing and Permitting Process,
  Easements Summer 2008
• Advertise Fall 2008
• Contract Approval Fall 2008
• Preconstruction TBD Utility relocations
  during stream closure.

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Questions
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Backup Slides
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PUBLIC PARTICIPATION

• DEP held a follow-up field meeting on November
  23, 2002 for the community, and presented the 60
  design to the CLC in March 2003.
• Montgomery County Planning Board unanimously
  endorsed the project on February 13, 2003
• NCPC Provided Conditional Approval in May 2003
  (pending finalizing permitting)