Introduction to Site-Specific Impact to Ground Water Soil Remediation Standards Guidance DocumentsDecember 2008 Revised I. IntroductionThe Remediation Standards rules, N.J.A.C. 7:26D-1.1 and the Technical Requirements for Site Remediation, N.J.A.C. 7:26E-1.3 require the person responsible for conducting the remediation to develop site-specific soil remediation standards that are protective of ground water. A site-specific impact to ground water IGW soil remediation standard must be developed when a discharge to soil is known or suspected. The Department has identified several methods that may be used to develop site-specific impact to ground water remediation standards which are briefly described below. The person responsible for conducting the remediation may use any of the following procedures to develop a site-specific IGW soil remediation standard. The methods may be used at any time during the remediation provided that sufficient site data and information, as described in the various guidance documents, are available on which to base the standard. The Department strongly recommends that IGW soil remediation standards developed using the methods described in these guidance documents be submitted to the assigned case manager prior to implementing the remedial action at a site. The purpose of the site-specific IGW soil remediation standards is to prevent unacceptable risk to human health from the ingestion of contaminated ground water, caused by the migration of contaminants from the unsaturated soil zone to the ground water. The standard is developed to protect against future contamination of ground water. The standards will be developed using the applicable health-based ground water quality criterion (GWQC) for the ground water where the site is located. The procedures that are provided in the guidance documents are all designed to be protective of Class II ground water. For Class I or III ground water, the Department will develop site-specific health-based ground water quality criterion appropriate for the ground water classification from which a site-specific IGW soil remediation standard can be derived. The site-specific IGW soil remediation standard will be based on the calculated health-based criterion or the soil Practical Quantitation Level (PQL), which ever is higher. For Arsenic, the health based site-specific IGW soil remediation standard defaults to the state wide natural background of 19 ppm. II. Methods to develop site-specific IGW soil remediation standards
III. Site information and data needsThe impact to ground water pathway is sensitive to variations in contaminant type and soil properties. The amount of information and data that are needed to develop a site-specific IGW soil remediation standard varies based on the procedure that is used. Each of the standards development methods have their own site information and data requirements which are described in each guidance document. Default IGW soil remediation standards which do not require any site-specific information, are available in the Soil-Water Partition Equation Guidance Document. [pdf 89 Kb]Depending on the procedure that is used to develop site-specific IGW soil remediation standards, a minimum of one sample must be taken in each area of concern in order to characterize soil properties and to determine the distribution of existing soil contamination. If soil properties are variable across an area of concern, additional sampling may be required. Sampling requirements of the Technical Regulations must also be followed. Sample results are compared to the site-specific IGW soil remediation standards developed for the area of concern or site on a point-by-point basis. VI. Using site conditions to evaluate impacts to ground water pathwayThe Department has identified methods to evaluate the impacts to ground water without the need to develop a site-specific IGW soil remediation standard. The nature and extent of contamination and other site-specific conditions will dictate whether there will be future impacts to ground water and determine if further remediation is required. When specified site conditions are met, the Department would not require further remediation for the impact to ground water pathway.
V. ReferencesUSEPA (1996). Soil Screening Guidance: Technical Background Document, May 1996. U.S. Environmental Protection Agency, Office of Emergency Response: Washington, DC, EPA/540/R-95/128 PB96-963502. | Alternate Format
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NJDEP SRP - Guidance: Remediation Standards (2024)
Table of Contents
Introduction to Site-Specific Impact to Ground Water Soil Remediation Standards Guidance Documents
I. Introduction
II. Methods to develop site-specific IGW soil remediation standards
III. Site information and data needs
VI. Using site conditions to evaluate impacts to ground water pathway
V. References
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