Stream & BMP Facility Monitoring

GTA has extensive experience performing stream and best management practice (BMP) monitoring in the Mid-Atlantic Region. Our services provide a means of evaluating changes in site water quality - spanning the pre-construction, construction, and post-construction phases of development. These services include addressing Special Protection Area (SPA) monitoring and detailed reporting requirements in Montgomery County, Maryland. Our monitoring services also have applicability to the evaluation of nutrient loading to the Chesapeake Bay in the context of regulatory TMDL requirements.

GTA’s capabilities include use of auto-samplers and flow measurement equipment to evaluate nutrient and metals reduction in stormwater as it moves through BMP structures. Additionally, GTA has substantial experience with monitoring of changes in stream thermal quality, flow and nutrient content. GTA also has monitor well drilling and installation capabilities and performs ground water quality monitoring and hydrogeological testing and analysis to complement stream and BMP monitoring efforts.

GTA provides comprehensive monitoring and hydrologic system analysis services to residential, commercial, industrial and governmental clientele, and we work as a client advocate.

Our areas of specialization include the following:

Summerfield Crossing, Montgomery County, MD

GTA performed stream, groundwater, and stormwater monitoring services at the Summerfield Crossing development located in Montgomery County, Maryland. This work was required by the Montgomery County Department of Environmental Protection (MCDEP). The development consists of approximately 71-acres with 255-residential units, and stormwater BMPs include dry ponds, a forebay, dry swales, bioretention structures, and surface sand filters. GTA’s services consisted of:

Stream temperature monitoring through the use of in-stream mounted temperature probes
Stream flow monitoring
Stream embeddedness monitoring
Floodplain photographic documentation
Stream nutrient sampling
Evaluation of stormwater BMP efficiency in reducing pollutant loads by using automated samplers and area velocity meters to estimate pollutant mass entering and exiting the BMP systems.

The purpose of the work was to evaluate potential impacts of the development on stream and groundwater conditions. The evaluation was successfully completed; GTA coordinated with MCDEP to conclude monitoring and to release our Client from further monitoring requirements.

Reserve at Fair Hill, Montgomery County, MD

GTA performed stream and groundwater monitoring services at the Reserve at Fair Hill development located in Montgomery County, Maryland. This work was required by the Montgomery County Department of Environmental Protection (MCDEP). The development consisted of approximately 340-acres with 133-residential units. Stormwater BMPs included sediment ponds with forebays and surface sand filters. GTA’s services consisted of:

Groundwater level monitoring through the use of datalogging pressure transducers
Groundwater quality monitoring
Stream level and precipitation monitoring through the use of datalogging pressure transducers and an on-site tipping-bucket rain gauge
Stream morphology and sinuosity surveys
Pebble count surveys