Current through Register Vol. 48, No. 38, September 20, 2024
The focused site investigation shall be performed where the
RA has specified limitations on the recognized environmental conditions or
contaminants of concern to be covered by the No Further Remediation Letter. At
a minimum the focused site investigation shall include:
a) A remediation site evaluation to identify
the following features as relevant to the focus of the investigation:
1) Current and post-remediation use(s) of the
remediation site and surrounding areas that are immediately adjacent to the
remediation site;
2) Physical
setting including features relevant to geologic, hydrogeologic, hydrologic, and
topographic conditions; structures or other improvements on the remediation
site; public thoroughfares adjoining the remediation site, as well any roads,
streets, and parking facilities on the remediation site; utilities located on
or adjacent to the remediation site; source of potable water supply; and sewage
disposal system;
3) The presence of
containers and storage tanks containing the selected contaminants of concern,
including contents, and assessment of leakage or potential for leakage;
and
4) Any other environmental,
geologic, geographic, hydrologic or physical conditions of concern at the
remediation site and surrounding areas immediately adjacent to the remediation
site;
b) Review of
reasonably obtainable records relevant to the recognized environmental
conditions and the related contaminants of concern for the remediation site and
areas immediately adjacent to the remediation site, records of environmental
enforcement actions and their subsequent responses, any previous response
actions conducted by either local, State, federal or private parties, and a
list of documents and studies prepared for the remediation site;
c) Characterization of sources and potential
sources of recognized environmental conditions and the related contaminants of
concern, identifying:
1) The sources or
potential sources of the contaminants of concern;
2) The sampling, analyses, and field
screening measurements indicating the concentrations of the contaminants of
concern; and
3) The statutory or
regulatory classification of the contaminants of concern and contaminated
materials (e.g., hazardous waste, hazardous substance, special
waste);
d)
Characterization of the extent of the contaminants of concern, identifying:
1) The actual contaminated medium or media of
concern;
2) The three-dimensional
configuration of the contaminants of concern with concentrations delineated;
and
3) The nature, direction, and
rate of movement of the contaminants of concern and degradation
products;
e)
Characterization of current and post-remediation exposure routes, identifying:
1) All natural and man-made pathways that are
on the remediation site, in rights-of-way attached to the remediation site, or
in any areas surrounding the remediation site that may be adversely affected as
a result of a release from the recognized environmental conditions and whether
there is evidence of migration of contaminants of concern, in either solution
or vapors, along such pathways that may potentially threaten human or
environmental receptors or that may cause explosions in basements, crawl
spaces, utility conduits, storm or sanitary sewers, vaults or other
spaces;
2) The locations of any
human and environmental receptors and receptor exposure routes; and
3) Current and post-remediation uses of
affected or potentially affected land, groundwater, surface water, and
sensitive habitats; and
f) Characterization of significant physical
features of the site and vicinity that may affect contaminant transport and
risk to human health, safety and the environment.
