# Presentation: 388106

## NIH Stormwater Management Program

- A variety of projects

## Stormwater, Why do we care?

- _[http://www.youtube.com/watch?v=2Sxwl_SOSAQ](http://www.youtube.com/watch?v=2Sxwl_SOSAQ)_

## 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.

## Slide 4

## NIH Campus Disharges to Stormwater

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

## 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

## 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**

## NIH Best Management Practices

## 2) Public participation and involvement;

**Along with other activities that showcased the NIH environmental efforts.**

**2) Public participation and involvement;**

**1) Public education and outreach**

**Earth Day at NIH includes stream tours...**

## 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

## 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.

## 5) post-construction runoff control

**Low Impact Development Stormdrain**

**Map and Maintain Existing BMP’s**

**5) post-construction runoff control**

## 6) Pollution prevention/good housekeeping

**6) Pollution prevention/good housekeeping**

## 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

## 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

## Ultimate GOAL: Protect the tributaries of the Chesapeake Bay Watershed

- Ultimate GOAL: Protect the tributaries of the Chesapeake Bay Watershed

## 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.

## 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.

## February 20th, 2004

**February 20****th****, 2004**

**NIH Stream Pedestrian Bridge**

## August 4th, 2006

**August 4****th****, 2006**

**NIH Stream Pedestrian Bridge**

## February 20th, 2004

**February 20****th****, 2004**

**NIH Stream ‘Pool’**

## August 4th, 2006

**August 4****th****, 2006**

**NIH Stream ’Pool’**

## January 12, 2004

**January 12, 2004**

**NIH Stream North**

## August 4th, 2006

**August 4****th****, 2006**

**NIH Stream North**

## Pool Areas

## Retention Filter – Wilson Drive

## Retention Pond 2006

## Northeast Stormwater Control

## North Underground Storage Structure

## Retention Structure Construction

## 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

## Slide 32

## Stony Creek Pond - Continued

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

## 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)**

## 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 pond’s 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****	**

## 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 7:00 a.m. to 5:00 p.m.**

## PROJECT STATUS – TentativeUpdated –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.**

## Questions

## Backup Slides

## 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)**