Design of a Remedy to Control NAPL Transport and Allow for Flexible Redevelopment

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  

DTE  Broadway  Street  Former  MGP  

I.  Background  

II.  Inves,ga,on  

III.  Remedy  Design  

IV.  Construc,on  

3  

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