× ×

Who We Are

× ×

About EA

× ×

Careers

× ×

Subcontractors/Suppliers

×

Howard County Total Maximum Daily Load Outfalls/Stream Restoration, Maryland State Highway Administration

image of EA team collecting from a stream

EA developed retrofit design for three existing stormwater outfalls to improve water quality treatment to assist the State Highway Administration (SHAin meeting their nutrient reduction and impervious area treatment goals.  Significant erosion is currently present in the tributary channels adjacent to the outfalls and the scope includes channel improvements to provide stable conveyance and floodplain connectivity.  The outfalls and adjacent tributary channels are being retrofitted to adequately and safely convey drainage while providing credit to SHA for use in helping to meet SHA’s wasteload allocation towards the Chesapeake Bay total maximum daily load.  Restoration is proposed to 2,285 linear feet of outfall and tributary channel which provides 22.9 acres of impervious acre equivalent.  SHA stormwater management standards are being followed for the designs.   

A hydrologic analysis was performed for key study points at each outfall and tributary.  An existing stormwater management facility adjacent to an outfall was analyzed to determine flow characteristics for the 100-year design storm for use in appropriately sizing structures, outfall, and channel bed material.  A hydraulic analysis was performed using HEC-RAS to evaluate channel stability for existing and proposed conditions including the 100-year storm.  Results from the hydraulic analysis and the geomorphic assessment were used in the design of natural channel features, such as step pools, riffle and pool sequences, and plunge pools. Grade control structures were designed to stabilize stream bed and banks by reducing stream slope and flow velocity.  Design included a desktop evaluation and visual assessment of the outfalls and tributaries to determine the project boundary to estimate potential restoration credits. Project constraints such as steep topography, utilities, wetlands, and specimen trees were identified and a geomorphic assessment was performed.  These data were utilized to prepare a concept that addresses the project goals while minimizing environmental resource impacts.  Photographs were taken at each site to document current conditions of the stream and surrounding riparian areas.  During this phase, EA identified additional stream lengths and outfalls not initially identified by SHA as part of the project that were deficient and opportunities for additional total maximum daily load crediting.  After review by SHA, the additional outfall and stream lengths were added to the project scope.   

Construction plans prepared by EA include existing conditions and demolition plan, proposed grading, applicable outfall and channel details for construction, details of instream structures, cross-sections and profiles, and traffic control plans.  EA prepared a detailed design report, construction specifications, and Engineer’s Probable Cost Estimate.  Bid phase services will be provided to assist SHA through the bidding process.  Additionally, construction phase services, including part-time inspections by a stream specialist, will be performed when the project is under construction.  

×

Contact Us

Name

×

Office Locations

View Map

Alaska

Anchorage

745 W 4th Avenue
Suite 425
Anchorage, AK 99501
Mike Jones P: 907-334-3909 Email Mike

Fairbanks

3544 International Way
Fairbanks, AK 99701
Travis Hines P: 907-646-0210 Email Travis

Arkansas

Fayetteville

700 Research Center Blvd
Suite 2221
Fayetteville, AR 72701
Matthew Frigon, PhD P: 479-575-2136 Email Matthew

California

Sacramento

555 University Avenue
Suite 110
Sacramento, CA 95825
Chris Canonica P: 916-604-4365 Email Chris

Colorado

Denver

7995 E Prentice Ave.
Suite 206E
Greenwood Village, CO 80111
Sarah Babcock P: 303-590-9140 Email Sarah

Delaware

Newark

131 Continental Drive
Suite 203
Newark, DE 19713
Kathy Fox P: 302-467-3025 Email Kathy

Georgia

Warner Robins

108 Byrd Way
Suite 600
Warner Robins, GA 31088-9199
Tommy Bruhn P: 478-308-7375 Email Tommy

Guam

1001 Army Drive
Suite 103
Barrigada, GU 96913-1402
Billy Janasak P: 671-646-5231 Email Billy

Hawaii

Honolulu

615 Piikoi Street
Suite 515
Honolulu, HI 96814
Chip Brown P: 808-589-1455 Email Chip

Illinois

Chicago

444 Lake Cook Road
Suite 18
Deerfield, IL 60015
Joe Vondruska P: 847-945-8010 Email Joe

Maryland

Corporate Headquarters

225 Schilling Circle
Suite 400
Hunt Valley, MD 21031
Ian MacFarlane P: 410-584-7000 Email Ian

Ecotoxicology & Biology Labs

231 Schilling Circle
Hunt Valley, MD 21031
Michael Chanov P: 410-584-7000 Email Michael

Abingdon

1311 Continental Drive
Suite K
Abingdon, MD 21009
Scott Dobson P: 410-671-6051 Email Scott

Ocean Pines

11200 Racetrack Road
Unit A101
Ocean Pines, MD 21811
Darl Kolar P: 410-641-5341 Email Darl

Michigan

Brighton

5918 Meridian Boulevard
Suite 4
Brighton, Michigan 48116
Arthur Peitsch P: 734-369-3410 Email Arthur

Montana

Helena

54 North Last Chance Gulch
Suite 14
Helena, MT 59601
Catherine LeCours P: 406-936-0022 Email Catherine

Nebraska

Lincoln

221 Sun Valley Blvd
Suite D
Lincoln, NE 68528
Dale Schlautman P: 402-476-3766 Email Dale

Omaha

7836 Wakeley Plaza
Omaha, NE 68114
Craig Johnson P: 402-817-7664 Email Craig

New Mexico

Albuquerque

320 Gold Avenue, SW
Suite 1300
Albuquerque, NM 87102
Jay Snyder P: 505-224-9013 Email Jay

New York

Marlboro

P.O. Box 144
25 Western Avenue, 2nd Floor
Marlboro, NY 12542
Melanie Dina P: 845-565-8100 Email Melanie

Oswego

82-B Creamery Road
Oswego, NY 13126
Gary Prye P: 315-342-1419 Email Gary

Syracuse

269 W Jefferson Street
Syracuse, NY 13202
Bob Casey P: 315-431-4610 Email Bob

Rhode Island

Providence

301 Metro Center Blvd
Suite 102
Warwick, RI 02886-3440
Ron Mack P: 401-736-3440 Email Ron

Texas

Dallas

405 State Highway 121 (Bypass)
Building C, Suite 100
Lewisville, TX 75067
Roger Place P: 972-315-3922 Email Roger

Houston

11550 Cypress N Houston Rd
Cypress, TX 77429
John Bonner P: 832-912-4038 Email John

San Antonio

13750 San Pedro Ave.
Suite B10
San Antonio, TX 78232
Brian O'Ferrall P: 210-546-2129 Email Brian

Virginia

Virginia Beach

4429 Bonney Road
Suite 430
Virginia Beach, VA 23462
Chris Penny P: 757-693-6014 Email Chris

Washington

Seattle

2200 6th Avenue
Suite 707
Seattle, WA 98121
Tim McCormack P: 206-452-5350 Email Tim

EA Satellite Residential locations (Contact 1-800-777-9750)

Dunedin, FL

Rick Hanoski

North Salem, IN

Matthew Bowman

Dover, NH

Amy Hunt

Pennsville, NJ

John Fellinger

Spencerport, NY

Caryn Kiehl-Simpson

Lubbock, TX

Danny Leaks