Timothy D McCobb
Tim McCobb is a Hydrologist in the USGS New England Water Science Center.
Tim has experience working on groundwater projects in southeastern Massachusetts, including research at the USGS Cape Cod Toxic Substances Hydrology field site and technical support of Dept. of Defense environmental restoration programs at Joint Base Cape Cod. He has extensive experience in groundwater field techniques, groundwater flow modeling, and GIS. Tim is currently working on projects that include the assessment of regional freshwater resources by using groundwater modeling, the examination of nitrogen and emerging contaminants in shallow, coastal groundwater, and the characterization of groundwater/surface-water interactions at a glacial kettle pond.
Professional Experience
Hydrologist, U.S. Geological Survey, New England Water Science Center, 1991 to Present
Education and Certifications
B.S. Civil Engineering, Northeastern University, 1995
Science and Products
Monitoring the removal of phosphate from ground water discharging through a pond-bottom permeable reactive barrier
Submarine Hydrogeological Data from Cape Cod National Seashore
Phosphorus in a ground-water contaminant plume discharging to Ashumet Pond, Cape Cod, Massachusetts, 1999
Long-term hydrologic monitoring protocol for coastal ecosystems
Detection of fresh ground water and a contaminant plume beneath Red Brook Harbor, Cape Cod, Massachusetts, 2000
Delineation of discharge areas of two contaminant plumes by use of diffusion samplers, Johns Pond, Cape Cod, Massachusetts, 1998
A siphon gage for monitoring surface-water levels
Channel morphology and streambed-sediment quality in the Muddy River, Boston and Brookline, Massachusetts, October 1997
Science and Products
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Filter Total Items: 20
Monitoring the removal of phosphate from ground water discharging through a pond-bottom permeable reactive barrier
Installation of a permeable reactive barrier to intercept a phosphate (PO4) plume where it discharges to a pond provided an opportunity to develop and test methods for monitoring the barrier’s performance in the shallow pond‐bottom sediments. The barrier is composed of zero‐valent‐iron mixed with the native sediments to a 0.6‐m depth over a 1100‐m2 area. Permanent suction, diffusion, and seepage sAuthorsT.D. McCobb, D.R. LeBlanc, A.J. MasseySubmarine Hydrogeological Data from Cape Cod National Seashore
In order to test hypotheses about ground water flow under and into estuaries and the Atlantic Ocean, geophysical surveys, geophysical probing, submarine ground-water sampling, and sediment coring were conducted by U.S. Geological Survey (USGS) scientists at Cape Cod National Seashore (CCNS) in Massachusetts from 2004 through 2006. This USGS Open-File Report presents the data collected as a resultAuthorsVeeAnn A. Cross, John F. Bratton, John Crusius, John A. Colman, Timothy D. McCobbPhosphorus in a ground-water contaminant plume discharging to Ashumet Pond, Cape Cod, Massachusetts, 1999
The discharge of a plume of sewagecontaminated ground water emanating from the Massachusetts Military Reservation to Ashumet Pond on Cape Cod, Massachusetts, has caused concern about excessive loading of nutrients, particularly phosphorus, to the pond. The U.S. Air Force is considering remedial actions to mitigate potentially adverse effects on the ecological characteristics of the pond from contiAuthorsTimothy D. McCobb, Denis R. LeBlanc, Donald A. Walter, Kathryn M. Hess, Douglas B. Kent, Richard L. SmithLong-term hydrologic monitoring protocol for coastal ecosystems
No abstract available.AuthorsTimothy D. McCobb, Peter K. WeiskelDetection of fresh ground water and a contaminant plume beneath Red Brook Harbor, Cape Cod, Massachusetts, 2000
Trichloroethene and tetrachloroethene were detected in ground water in a vertical interval from about 68 to 176 feet below sea level beneath the shoreline where the contaminant plume emanating from a capped landfill on the Massachusetts Military Reservation intersects Red Brook Harbor. The highest concentrations at the shoreline, about 15 micrograms per liter of trichloroethene and 1 microgram perAuthorsTimothy D. McCobb, Denis R. LeBlancDelineation of discharge areas of two contaminant plumes by use of diffusion samplers, Johns Pond, Cape Cod, Massachusetts, 1998
Diffusion samplers were installed in the bottom of Johns Pond, Cape Cod, Massachusetts, to confirm that volatile organic compounds from the Storm Drain-5 (SD-5) plume emanating from the Massachusetts Military Reservation (MMR) were discharging into the pond. An array of 134 vapor-diffusion samplers was buried by divers about 0.5 feet below the pond bottom in the presumed discharge area of the SD-AuthorsJennifer G. Savoie, D.R. LeBlanc, D.S. Blackwood, T.D. McCobb, R. R. Rendigs, Scott CliffordA siphon gage for monitoring surface-water levels
A device that uses a siphon tube to establish a hydraulic connection between the bottom of an onshore standpipe and a point at the bottom of a water body was designed and tested for monitoring surface-water levels. Water is added to the standpipe to a level sufficient to drive a complete slug of water through the siphoning tube and to flush all air out of the system. The water levels in the standpAuthorsTimothy D. McCobb, Denis R. LeBlanc, Roy S. SocolowChannel morphology and streambed-sediment quality in the Muddy River, Boston and Brookline, Massachusetts, October 1997
No abstract available.AuthorsRobert F. Breault, Peter K. Weiskel, Timothy D. McCobb - News