From:	Bill Haldeman [bhaldeman@pesenv.com]
Sent:	Thursday, March 05, 2015 3:37 PM
To:	Fujita, Hideo (ECY)
Cc:	Cruz, Jerome (ECY); Ronald Burt; Brian O'Neal
Subject:	RE: ZVI Reactor Vessel Status & Update on Hexcel Enhanced 
In Situ Bioremediation (EISB) project

Hideo, as we just discussed on the phone, BSB is currently pumping groundwater from the top of Cell 1 
and treating it with the air stripper treatment system prior to discharge to the sanitary sewer.  BSB will 
continue pumping and pre-treating the water this way until the groundwater elevations outside of the 
containment cell have dropped to the dry season low levels.  At that point, BSB will compare use of either 
ZVI with a biocide/biodispersant or air stripping as the long-term treatment method prior to discharge of 
the pumped water to the sanitary sewer.  If ZVI (with use of a biocide/dispersant) were selected, the 
biocide would only be released into the first cell of the reactor vault; from there it would flow through the 
ZVI and the empty cells of the reactor vault, and would eventually be pumped to the sanitary sewer.  BSB 
will select the most feasible and cost-effective pre-treatment method and submit it to Ecology for 
approval.  We will keep you updated on the process as we proceed.  It was good talking to you today!  
Let me know if you have any other questions.  -Bill

From: Fujita, Hideo (ECY) [mailto:HFUJ461@ECY.WA.GOV]  
Sent: Thursday, March 05, 2015 12:32 PM 
To: Bill Haldeman; Ronald Burt; Brian O'Neal 
Cc: Cruz, Jerome (ECY) 
Subject: ZVI Reactor Vessel Status & Update on Hexcel Enhanced In Situ Bioremediation (EISB) project

All,
Update:
Ecology met with Hexcel today. Hexcel is proceeding with the proposed EISB project similar to what is 
outlined in the Geosyntec White Paper (March 14, 2014). 
 
Question:
What is status and future use of the ZVI Reactor Vessel?  Specifically, in our last update meeting the 
end of last year, you mentioned several possible options you were investigating. Are you still 
considering a pre-treatment of the groundwater in cell #1 of the Reactor Vessel? Or do economics 
dictate using the vault as a collection point and then pumping through the carbon filter then 
discharging to the KC Industrial Waste Water sewer system?
 
Approval Process:
With the advent of Hexcel’s EISB treatment, BSB needs to notify Ecology of any pre-treatment 
considerations and action(s) and obtain approval from Ecology for such actions before proceeding.
 
Please update me on the current status and future plans for the ZVI Reactor Vessel.
Thanks,
Hideo
___________________________________________________________________________________________________________
Hideo Fujita | WA State Department of Ecology | Hazardous Waste Program | 3190 – 160th AV SE , Bellevue, WA 98008-5452 
425-649-7068 phone | 425-649-7218 fax |  hideo.fujita@ecy.wa.gov  email