Environmental and MS4

Mercado has provided environmental science services to a number of agencies including the Maryland State Highway Administration, Montgomery County, Prince George’s County and the Washington Suburban Sanitary Commission since 2008.

Our firm now offers a full suite of environmental and stormwater services tailored to support MS4 permit compliance, ecological restoration, stormwater management quality and quantity requirements, and sustainable infrastructure planning. Whether supporting permitting, monitoring, watershed planning, or ecological design, our team brings a multi-disciplinary approach to every project.

environmental science - reeds

Services we provide include:

  • MS4 Program Development & TMDL Compliance – Preparation and support for MS4 permit requirements, TMDL tracking, pollutant load calculations, and regulatory coordination.
  • Stream Restoration and Outfall Stabilization Design – Outfall and stream restoration design following Protocols 1 and 5 for MS4 credits.
  • Natural Resource Inventory – Wetland delineations, Waters of the U.S. delineations, Rare, Threatened, and Endangered (RTE) investigations, Northern Long Eared Bat investigations, tree identification and tagging, forest stand delineation, and GIS data collection.
  • Stormwater Management (SWM) BMP Design – Planning and design of structural and non-structural Best Management Practices (BMPs) including bioretention, permeable pavement, detention/retention facilities, and other low-impact development strategies to meet water quality, quantity, and channel protection requirements.
  • Environmental Permitting & Regulatory Coordination – Federal, state and local permitting including wetlands, Waters of the U.S., and environmental assessments for NEPA permits.
  • Forest Conservation Planning & Compliance – Preparation of Forest Stand Delineations (FSDs) and Forest Conservation Plans (FCPs) in accordance with local and state Forest Conservation Acts, including afforestation/reforestation strategies, mitigation design, and coordination with permitting agencies.
  • Survey – Bathymetric survey for stormwater management ponds and topographic surveys in highly vegetated areas.
  • Environmental Inspection & Monitoring – Water quality sample collection and testing for NPDES requirements.

Successfully completed Projects

Davis Mill Road Stream Restoration and Flood Management
Fenway Road and Tributary to Cabin John Creek Emergency Outfall Restoration
MDTA NPDES Evaluation of Outfalls Systemwide
Chesapeake Bay Crossing Study – Tier 2 NEPA
Twinbrook/Rockcrest Watershed Flood Study

Our Environmental Scientists are certified in the following services:

Contact Information

Our Services

Mercado offers comprehensive professional civil engineering and related services to Maryland, DC and Virginia. 

Bridge Inspection
Our bridge inspection department conducts annual and biennial inspections, scour analyses and load ratings...
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Civil Engineering
Our civil engineering department consists of staff experienced in developing designs for highway, roadway...
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Construction Management & Inspection
Our construction managers and inspectors represent the interests of the owner throughout all phases of...
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Environmental and MS4
Our environmental scientists are qualified to delineate wetlands and forest stands, as well as conduct...
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GIS & Archaeology
Our GIS technicians provide comprehensive GIS services from field data collection to final data processing...
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Structural Engineering
Structural Engineering for transportation projects constitutes a key component of Mercado Consultants’...
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Surveying
Our licensed surveyors, certified survey technicians and field crews specialize in conducting detailed...
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Water & Sewer Engineering
Our water & sewer engineering department consists of staff serving WSSC, DC Water, and Baltimore City,...
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