design of a remedy to control napl transport and allow for flexible redevelopment
DESCRIPTION
TRC engineer and scientist John Rice highlights TRC’s patented sediment capping technologies that address NAPL-containing sediment and bank soils at former manufactured gas plant (MGP) sites. The presentation was part of the Fifth International Symposium & Exhibition on the Redevelopment of Manufactured Gas Plant Sites (MGP 2014) .TRANSCRIPT
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www.trcsolu*ons.com
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
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DTE Broadway Street Former MGP
I. Background
II. Inves,ga,on
III. Remedy Design
IV. Construc,on
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3
I. Background
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Former Broadway Street MGP ~2010
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Huron River Shoreline Improvements/Restora,on
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II. Inves*ga*on
• Sediment Cores - Bulk samples • Poke Testing • Corral Sampling
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• Portable 2” Vibracore • Hand-driven core • Wildco Ponar Sampler
Sediment Core Collec,on Using Vibracore
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NAPL in Sediment Cores
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Sheen Producing Sediment from Cores
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Poke Tes,ng
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Sheen Corral Sampling
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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
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Conceptual Model of NAPL Transport
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III. Remedy Design
Sediment Cap Integrated with Upland Removal
Removal of Tarry Sediment
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NAPL Trapping Cap Design with NAPL Collec,on Sump
U.S. Patents Nos. 8,419,314 and 8,651,768
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Transmission Layer – Crushed Rock
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Containment Layer – AquaBlokTM
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Rip Rap Armor – 18-‐inch Field Stone
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IV. Construc*on Excava,on of Upland Coal Tar Source Area
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Excava,on of Sediment and Bank Soil
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Placement of NAPL Transmission/Collec,on Layer
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Installa,on of the NAPL Collec,on Sumps – Allows Collec,on of Poten,al LNAPL and DNAPL
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AquaBlokTM Containment Layer Being Spread over Transmission Layer
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Grading Out the AquaBlokTM Containment Layer
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Capping in Progress – Transmission Layer Being Laid Down inside Double Turbidity Curtain
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Capping in Progress – Erosion Control and Rip Rap
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Huron River aber Site Restora,on