Hot Spots at MGP Sites – How to Deal with Them During ISS Treatment



Hot Spots at MGP Sites – How to Deal with Them During ISS Treatment

Presenter:  Paul R. Lear (Envirocon)
Author:  Paul R. Lear (Envirocon)


Remediation has recently been conducted at both the Former Paulsboro Municipal Gas Works Site in Paulsboro, NJ and the Former Central Municipal Gas Works Site in Edison, NJ.  These sites were home to a former manufactured gas plant (MGP) facility and the contaminants of concern included PAHs, VOCs, SVOCs and metals exceeding the NJDEP Soil Cleanup Criteria.  The proposed method of remediation was determined to be in-situ soil stabilization (ISS).  The SPLP leachability criteria for the Paulsboro site was less than 10 times the NJDEP Ground Water Quality Standards (GWQS); while at the Edison site, it was less than 20 times the NJDEP GWQS due to regulatory changes.  Treatability testing for the Paulsboro site indicated that PAHs, specifically naphthalene and methylnaphthalene, exceeded the SPLP leachability criteria. At the Edison site, benzene exceeded the SPLP leachability criteria.  At both sites, ISS mix needed to be developed to reduce the leachability of organic contaminants to below the regulatory performance criteria.   The ISS was performed at these sites using an excavator to thoroughly homogenize the material with the reagents.  The treatment depths ranged from 9 feet to 26 feet below ground surface.  At both sites, hot spots were identified that required adjustment to the ISS mix design developed in the laboratory.  All of the treated material at both sites met the required performance criteria.  This paper will briefly cover the background, treatability testing, and ISS approach for each site.  The paper will focus on the effect of the hot spots on the ISS treatment and how the hot spots were dealt with.


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