Design of a Remedy to Control NAPL Transport and Allow for Flexible Redevelopment
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Transcript of Design of a Remedy to Control NAPL Transport and Allow for Flexible Redevelopment
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Design of a Remedy to Control NAPL Transport and Allow for Flexible Redevelopment
Presented at: FiBh Interna*onal Symposium and Exposi*on on the Redevelopment of Manufactured Gas Plant Sites
Des,n, Florida
Presented by:
John Rice, Alyssa Sellwood, Katherine Vater, Vince Buening and Colin Daining
TRC Environmental Corpora*on -‐ Madison, WI, and Ann Arbor, MI
Shayne Wiesemann DTE Energy -‐ Detroit, MI
April 7, 2014
DTE Broadway Street Former MGP
I. Background
II. Inves,ga,on
III. Remedy Design
IV. Construc,on
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I. Background
Former Broadway Street MGP ~2010
Huron River Shoreline Improvements/Restora,on
II. Inves*ga*on
• Sediment Cores - Bulk samples • Poke Testing • Corral Sampling
• Portable 2” Vibracore • Hand-driven core • Wildco Ponar Sampler
Sediment Core Collec,on Using Vibracore
NAPL in Sediment Cores
Sheen Producing Sediment from Cores
Poke Tes,ng
Sheen Corral Sampling
Poten,al Modes of Contaminant Transport
• Ebulli,on-‐facilitated DNAPL migra,on from sediment
• LNAPL seepage from the river bank
• Erosion of hardened asphal,c tar and transport as solid par,cles
• Erosion of tarry/oily sediment from river bank
Conceptual Model of NAPL Transport
III. Remedy Design
Sediment Cap Integrated with Upland Removal
Removal of Tarry Sediment
NAPL Trapping Cap Design with NAPL Collec,on Sump
U.S. Patents Nos. 8,419,314 and 8,651,768
Transmission Layer – Crushed Rock
Containment Layer – AquaBlokTM
Rip Rap Armor – 18-‐inch Field Stone
IV. Construc*on Excava,on of Upland Coal Tar Source Area
Excava,on of Sediment and Bank Soil
Placement of NAPL Transmission/Collec,on Layer
Installa,on of the NAPL Collec,on Sumps – Allows Collec,on of Poten,al LNAPL and DNAPL
AquaBlokTM Containment Layer Being Spread over Transmission Layer
Grading Out the AquaBlokTM Containment Layer
Capping in Progress – Transmission Layer Being Laid Down inside Double Turbidity Curtain
Capping in Progress – Erosion Control and Rip Rap
Huron River aber Site Restora,on