Benthic Flux Chamber Pilot Testing Update

Benthic Flux Chamber Pilot Testing Update

Anchor Spike

Pump Motor

Battery Box Pump SW Inlet Valve

Pump Flow Diverter Valve

Pump Housing & Impeller

Octagonal Flux Chamber

Equalization Ports & Plugs

Rich Landis - DuPont August 9, 2005

Emplacement Gage Plate

BFC Program Objective - Direct measurement of THg and MeHg flux from selected areas within the Phase I Experimental Ecological Study Reaches - Five mud deposits will be studied - Three gravel deposits will be studied - Relative determinations will be made regarding THg and MeHg flux to the surface water

SRST Mtg, August 9, 2005 Page 2

“2006 BFC Mud Deposit Proposal” - Investigate potential MeHg and THg flux from mud deposits - Compare results of opaque and transparent BFCs - Measure DO, MeHg, and THg - Analyze Sediment for THg, MeHg, TOC, Particle Size, Etc. - BFC sampling is scheduled for June, 2006

SRST Mtg, August 9, 2005 Page 3

BFC Mud Deposit Arrangement

SRST Mtg, August 9, 2005 Page 4

BFC Locations, Phase I Eco Study Reaches RRM-13.1

RRM-5.2 RRM-3.0 RRM-2.0

SR-01 SRST Mtg, August 9, 2005 Page 5

“2006 BFC Gravel Streambed Proposal” - Investigate potential MeHg and THg flux from Gravel Beds deposits - Compare results of opaque and transparent BFCs - Measure DO, MeHg, and THg - Analyze Sediment for THg, MeHg, TOC, Particle Size, Etc. - Deploy BFC substrate plates in June - BFC sampling in August

SRST Mtg, August 9, 2005 Page 6

BFC Gravel Bed Substrate Plate

Rocks from the South River

Anchors

Gravel Bed

SRST Mtg, August 9, 2005 Page 7

BFC Gravel Bed Arrangement

BFC Substrate Plate

BFC Anchor Bolts Gasket Housing

Anchors

Gravel Bed

SRST Mtg, August 9, 2005 Page 8

SRST Mtg, August 9, 2005 Page 9