Text Box: ARCADIS has just completed the draft design document for the permeable reactive barrier (PRB) that is the chosen remedy for groundwater in Area D.  The pump-and-treat system is the remedy that is currently in place in the area and it  captures contaminated groundwater before it reaches Green Pond Brook.  The design for the PRB was one of the topics that ARCADIS discussed at a November 9th project meeting.  The PRB dimensions are expected to be 250 feet in length, 35 feet in depth, and 2 feet in width.  ARCADIS calculated that groundwater exiting the PRB will require approximately 1 year to migrate to Green Pond Brook.  The PRB needs to have a much greater permeability than the surrounding aquifer materials to insure that groundwater will preferentially flow through it.  Also its width and iron concentration need to be such that there will be sufficient contact time for entering groundwater to react sufficiently with the iron.  The design will provide for passive venting of hydrogen so that the permeability of the wall is not reduced by gas formation.   Four locations have been proposed for surface water           

Text Box: sampling along Green Pond Brook.  Additional geotechnical investigation is scheduled for December 2006.  Soil borings will be completed along the axis of the PRB.  Undisturbed soil samples will be collected for analysis of grain size and permeability.  Monitoring wells will be installed both up- and down-gradient of the intended location for the PRB.  The monitoring wells will be used to measure the groundwater level and to collect water quality samples.  A real concern from the perspective of the golf course is that groundwater does not “back up” at the upgradient end of the PRB.  The depth to water in that area is only 1.5 feet below ground surface; any reduction in permeability of the PRB would cause water levels to rise.  Immediately after the PRB is in place ARCADIS intends to shut off the pump-and-treat system.  The pump-and-treat system will remain in place until the 5-year review following completion of the PRB (currently scheduled to be in 2011).  If the PRB is operating satisfactorily then the pump-and-treat system will be dismantled.

POINTS OF INTEREST:

· December 14, 2006 -  RAB meeting from 6:30 to 8:30 pm at the Hilton Garden Inn in Rockaway, New Jersey.  Meeting topics include Area D groundwater and an update on the Military Munitions Response Program (MMRP).

· January 11, 2007 - ARCADIS project planning meeting. 

· Installation Action Plan (IAP) meeting scheduled for February 6 – 8, 2007 and will most likely be held at Picatinny Arsenal. 

NO RISK

2

TRAINING

2

MOLASSES

2

DRMO YARD

3

DAILY RECORD

3

TCRA

3

NO SHOW

4

 

MODELS

5

EPA ON HRR

6

MORE MMRP

6

CONSTRUCTION

6

OFF-POST MMRP

7

RAB TO NJDEP

7

Text Box: The Picatinny Arsenal Environmental Restoration Advisory Board’s 
TAPP Contractor presents

FALL 2006

Volume 4, issue 4

Text Box: Environmental Happenings
At Picatinny Arsenal
Text Box: IN THE FIELD…..
Text Box: Recent field activities for August, September, October and November 2006 included the following:
600 Area:  Collection of groundwater and surface water samples. (August and October)

Text Box: Area D:  Monthly sampling for pump-and-treat system (August through October)  Quarterly ecotoxicity testing. (August and September)  Collection of groundwater and surface-water samples. (September)  Quarterly air sampling for pump-and-treat

continued on page 4

FORE!  A  PRB  IS  COMING  TO  THE  GOLF  COURSE

Text Box: Editorial Reviewers
David Forti, Michael Glaab, Courtenay Huff
Technical Advisors
Ted Gabel, William Roach,   Greg Zalaskus

system. (September)

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