CR Environmental, Inc.
Ecological & Oceanographic Consultants, East Falmouth, Massachusetts

Environmental Sampling, Aquatic Vegetation & Bathymetric Surveys, and Sediment Mapping
Jordan Pond
Shrewsbury, Massachusetts

CR Environmental provided GZA GeoEnvironmental, Inc. (GZA) with limnological services required to assess and remediate bacterial and nuisance aquatic vegetation impacts to this intensively used urban pond.  Services included: collection of surface water and sediment samples for extensive microbiological and chemical analysis; physical/chemical water quality profiling using an oceanographic CTD instrument and conventional multi-parameter water monitoring instruments; and mapping of aquatic vegetation, water depth and sediment thickness.

Because the surveys and sampling were conducted during late autumn, most of the nuisance aquatic vegetation present in the pond was senescent and below the water surface.  Additionally, sub-surface visibility of vegetation was severely impaired as the result of a late-season bluegreen algal bloom.  Therefore, CR mapped vegetation based on bottom sweeps of dying vegetation and by carefully evaluating the 200kHz sonar data collected during our bathymetric mapping effort (see bottom-right image).

CR delivered a comprehensive ArcView GIS project including all environmental and hydrographic data and maps. These data will help GZA engineers to assess the environmental condition of the pond and the options for improvement of water quality.

Reference:

Peter Baril
GZA GeoEnvironmental, Inc.
One Edgewater Drive
Norwood, MA 
Phone: 781-278-3700

Typical water quality profile - Jordan Pond

Bathymetric surface map of Jordan Pond

 

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Sonar data used to map stands of submergent aquatic vegetation obscured from surface view by cyanobacterial bloom