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NJDEP Ground Water Technical Guidance

Posted on May 18th, 2012

On April 3, 2012,  the NJDEP released the Ground Water Technical Guidance Document. The document provides technical guidance on

  • performing and achieving compliance with the requirements of the Department’s technical rules with regard to the remediation of ground water
  • characterizing hydrogeology and ground water contamination during the site investigation and remedial investigation phases
  • evaluating the effectiveness of ground water remedial actions

The Conceptual Hydrostratigraphic Model is the groundwater portion of the conceptual site model and the technical guidance document places a lot of emphasis on the model’s development and revision. The Conceptual Hydrostratigraphic Model is developed using available materials (topo maps, geologic references, cross sections, depth to water info, flow direction & velocity, anticipated plume extent) and is meant to steer the development of the groundwater remedial investigation plan.

This guidance offers a lot of useful information and references for developing the Conceptual Hydrostratigraphic Model, particularly with respect to geologic regions and units in NJ.

The guidance also provides good information on documenting:

  • background / offsite conditions
  • investigation source areas(ie LNAPL, DNAPL, and bedrock sources)
  • remediation technologies
  • monitoring remediation effectiveness

The guidance also discusses the development of a CEA as part of the RI, not the RAW or RAR, which may be one of the more notable changes to what was typically done in the past.

All in all, this guidance consolidates many good references for New Jersey geology literature, etc., provides a lot of information and frame work for conducting groundwater investigations, and should serve to be a useful tool for conducting groundwater investigations/remediation.

For additional information see the following link to the NJDEP’s technical guidance:

<https://www.state.nj.us/dep/srp/guidance/index.html#pa_si_ri_gw

James Vander Vliet, PE, LSRP

Project Manager


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