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Text Box: Environmental Happenings
Text Box: During a public meeting of the board in 2010 individuals describing themselves as arsenal employees, including at least one person who referred to himself as a union representative, had verbally expressed before the assembled body  concern that an arsenal building housing  several employees, Building 91 located near Area D, might be experiencing unwanted vapor emissions. Apparently the building occupants had expressed concern over indoor air quality at a public meeting held in April 2010.  However, based on current USEPA and NJDEP guidance, currently accumulated groundwater data does not appear to evidence significant potential for vapor intrusion. Nevertheless, an indoor air quality investigation was conducted by Picatinny Arsenal.  An Army

  Vapor intrusion concerns

Industrial hygienist screened indoor air quality and found it to be acceptable.  Building occupants were notified of those results at a meeting on September 23, 2010.  Although there did not appear to be reason for further action Picatinny Arsenal agreed to complete a vapor intrusion study.   Sub-slab sampling was conducted in October 2010.  Three different locations were tested.  At each location a ˝-inch diameter hole was drilled in the concrete floor.  Tubing was inserted in the hole and sealed in with clay.  An air sample was collected over a 24-hour time period using a Summa canister.  Results of the sampling were submitted to the regulators in draft final form as “Vapor Intrusion Evaluation for Area P – Site 78, Building 91.”  The NJDEP responded on November 9, 2010 and recommended no further action.  Reportedly vinyl chloride was not detected and although carbon disulfide, toluene, trans-1,2-dichloroethene, and

600 area work plan finalized after comments

Comments from the NJDEP (October 26, 2010) and the USEPA (November 2, 2010) on the draft final 600 area work plan (dated October 2010) were minor. Picatinny Arsenal responded to the comments on December 13, 2010 and by December 14, 2010 it had issued a final work plan.

The NJDEP had requested that soil in an area that had previously been covered by surface rock fill be “fully characterized.”  The arsenal responded that the focus of the source area investigation was to identify the potential source of the 600 Area groundwater plume.  The overall investigation approach was reiterated as follows by the Army:

  “As part of the source area investigation, 10 of the proposed soil samples (collected from both surface and subsurface locations) will also be analyzed for TAL Metals, Baseline Explosives, and PAHs.  Sample locations will be determined based on field observations (including PID readings,

 

 soil staining, or debris indicative of a potential contaminant source) from the proposed test pits, where the location of the test pits will be determined from the results of the passive soil gas survey.  The 600 Area FS, Proposed Plan, and Record of Decision will be completed based on the results of the VOC source area delineation. The remaining sampling results will be evaluated and if contamination is identified the Army will follow up with a separate Site Investigation.  The SI will address the fill materials deposited at the site during the 1970s.  It should be noted that the remainder of the Munitions Testing Area is slated to be investigated under the Military Munitions Response Program.All of the additional analytical parameters will be provided for use in the MMRP evaluation.”  According to the transmittal letter accompanying the final work plan, the intention to treat contamination, if any, from the fill area as a separate SI and as a new site is consistent with Army policy.

The USEPA’s two comments related to the gore sorbers for the passive soil gas survey.  The USEPA recommended the addition of two more Gore Sorbers and those

locations were added to the work scope by Picatinny Arsenal.  In addition the USEPA requested that the results of the soil gas survey along with the proposed locations of trenches (test pits as referenced by the Arsenal) be submitted to the USEPA and the NJDEP before performing additional sampling.  Picatinny Arsenal agreed to provide soil gas results and proposed trench/test pit locations to regulators in advance of the work.  The installation of Gore Sorbers was scheduled for the week of December 21, 2010.

 tetrachloroethene were detected, those compounds were detected in amounts below applicable criteria.  The USEPA responded on December 14, 2010 that it was in agreement with Picatinny Arsenal’s no-further action recommendation because “...the detected concentrations of VOCs in the subslab area are all below the Non-Residential NJDEP Soil Gas Screening Levels.”

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