Text Box: The permeable reactive barrier (PRB) was successfully installed by ARCADIS and their contractor in April 2007 just before a Nor’easter hit New Jersey and unleashed record rainfall on the area. After trenching and wall construction had been completed the Nor’easter turned the construction area into a soggy mess with many areas of the golf course completely submerged.  Prior to the storm hitting, the construction crews had already experienced water difficulties. The unexpected volume of groundwater made construction almost impossible without  far more intensive dewatering.  Pre-construction plans had called for the installation of dozens of well points to be used for dewatering.  The network that was initially installed proved to be inadequate for dewatering the sand units in the area – the trenching could not proceed due to “running sands” ( saturated sand ) that would fill in the trench thus not allowing the trench to  stay open during construction.  ARCADIS ultimately installed more and deeper wells with a larger diameter to withdraw excess water. To accommodate the groundwater anticipated 


Text Box: to be onsite it was originally planned that water would be pumped out during the dewatering phase to a series of large frac tanks located nearby to  the construction site.  However, the inclusion of additional wells increased the total flow rate to 1,000 gallons per minute.  Therefore the frac tanks could not be used to contain the enormous volume of  water.  With the cooperation of NJDEP officials, including Mr. Greg Zalaskus, ARCADIS received permission in short order to treat the water and to then discharge it almost half a mile away into a swampy area of the Arsenal. Precautions were taken to avoid contaminating the swampy area. The water was treated using granular activated carbon vessels set up in series. Both influent and effluent water were sampled and analyzed frequently.  Volatile organic compounds related to the contaminants present in the local groundwater were not detected in the effluent. Although, minor contaminants probably related to the piping system were detected periodically in concentrations presumably below NJDEP actionable levels.  Once the dewatering system was operative the trenching only

POINTS OF INTEREST:

· The next RAB meeting will be held on May 31st at the Hilton Garden Inn in Rockaway, New Jersey from 6:30 to 8:30 pm.  Members of the public are invited to attend.  Topics include the following:  Area D PRB installation, DRMO remedy overview, Area B update, MMRP update, and election of community co-chair.

· The next technical project meeting will be held on June 27th.  Hosted by ARCADIS, the PBC contractor, the meeting will focus on technical and regulatory issues.   

documents

2

training

2

Vapor sampling

3

NJDEP focus

3

Soil standards

3

Area B cleanup

4

Njdep response

5

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

SPRING  2007

Volume 5, issue 2

Text Box: Environmental Happenings
At Picatinny Arsenal
Text Box: IN THE FIELD…..
Text Box: Recent field activities for March, April, and May 2007 included the following:
600 Area:  Collection of groundwater samples from monitoring wells.  (March)  Modification of the potable well at the AWDF building

Text Box: in preparation for the upcoming pumping test. (April)
 ETSCP Groundwater Investigation:  Installation of an in situ bioremediation treatment system for groundwater near Building 823 as part of the

continued on page 4

WATER  HAZARD  AT   THE  GOLF  COURSE

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

demonstration project. (March)

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