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Development and Research: Passive-Vapor-Diffusion Sampler

Delineating Discharge Areas of Contaminant Plumes with Passive-Vapor-Diffusion Samplers in Johns Pond, Cape Cod, Massachusetts

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pipeline rupture

View of Massachusetts Military Reservation and Ashumet Pond, Cape Cod, Massachusetts. Johns Pond is in lower right corner.

pipeline rupture

Close-up of passive-vapor-diffusion sampler.

Schematic of a diffusion sampler

Photo and schematic of passive-vapor-diffusion sampler.

crude oil spray area
Passive-vapor-diffusion samplers with (A) vial and screw cap, (B) uncapped glass vial sealed in polyethylene tubing and secured to wire surveyor flag, and (C) glass vial sealed in polyethylene sandwich bags and secured to wire surveyor flag (figure from WRIR 02-4186)
Adding the diffusion samplers on a line
Connecting passive-vapor-diffusion samplers to a line before placement in bottom sediments of Johns Pond, Cape Cod, Massachusetts.
Placing the diffusion sampler in the lake
Lowering line with diffusion samplers attached to the bottom of Johns Pond, Cape Cod, Massachusetts.
Placing the diffusion samplers in a lake
Scuba divers getting ready to place diffusion samplers into bottom sediments of Johns Pond, Cape Cod, Massachusetts.
boat in the lake
Scientists collecting ground-water samples from the pond bottom at Johns Pond, Cape Cod, Massachusetts, with a drive-point sampling well to confirm the data obtained with the diffusion samplers. Savoie and others (2000) describe the drive-point sampling wells.
Map of the SD5 area
Map of the Storm Drain-5 (SD-5) plume on the Massachusetts Military Reservation, Cape Cod, Massachusetts.
Map of the SD5 area
Map of the extent of discharge for storm drain-5 (SD-5) plume in Johns Pond, Massachusetts. Contour lines are TCE concentrations in parts per billion (ppb). Note the TCE "hot spot" separate from the main discharge area. Further investigations showed that the "hot spot" was from another plume.
TCE plume figure
West to east cross-section of trichloroethylene (TCE) plume. Plume is flowing under Ashumet Pond and discharging to Johns Pond, Cape Cod, Massachusetts. The TCE plume was identified as a branch of the chemical spill-10 (CS-10) plume.
Map of subsurface plumes
Map of subsurface plumes and discharge areas in the Johns Pond, Massachusetts, area. Black dots are locations of diffusion samplers. The TCE plume flows under Ashumet pond and over the top of the storm drain-5 (SD-5) plume. The TCE plume was identified as a branch of the chemical spill-10 (CS-10) plume.
map of all areas
Map of the chemical spill-10 (CS-10) and storm drain-5 (SD-5) plumes on the Massachusetts Military Reservation (MMR) and the discharge areas in Johns Pond, Cape Cod, Massachusetts. Contour lines are water-table elevations in feet above sea level.
Map of Snake Pond
Location of diffusion samplers in Snake Pond, Cape Cod, Massachusetts used to delineate contaminated ground-water discharge areas
Modified from WRIR 03-4133
 

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Page Last Modified: Tuesday, 06-May-2014 14:36:56 EDT