comprehensive site investigation and remediation objectives report

A Tier 1 RO evaluation of Site data indicates the following:
‣ The exposure pathway of concern for metals is only the Tier 1 direct groundwater
ingestion route.
‣ The exposure pathways of concern for VOCs are Tier 1 soil ingestion, inhalation, soil
component of the groundwater ingestion route and direct groundwater ingestion.
Remediation Objectives
The following ROs are proposed for the Site:
• Tier 1 Industrial-Commercial and Construction Worker ROs for the soil inhalation and
ingestion exposure pathways and Class I groundwater ingestion ROs.
• Tier 2 soil component of the Class I groundwater ingestion and Tier 2 Class I direct
ingestion groundwater ROs on-site. A groundwater use restriction at the Site will move
the compliance point to the Site boundaries. A post-remediation TACO evaluation,
including Tier 2 simulations, will demonstrate Tier 2 site-specific ROs and residual
concentrations are protective (e.g., Tier 1, Class I direct ingestion groundwater ROs are
achieved.) The post-remediation Tier 2 will be documented in a future Remedial Action
Completion Report.
Institutional Controls
Institutional controls will be placed on the Site that would:
• Restrict subsurface construction and maintenance (in specified areas) to qualified
personnel (i.e., in accordance with applicable OSHA regulations) via construction worker
notification;
• Restrict groundwater usage at the Site utilizing the existing groundwater ordinance;
• Maintain barriers to exclude exposure routes as applicable to specified areas of
ingestion and inhalation, as necessary.
Based on the approval of Tier 1 and 2 evaluations and the implementation of future remedial
actions and institutional controls, the Site can qualify for an NFR determination:
A separate remedial action plan (RAP) will be submitted for IEPA approval prior to any cleanup
actions.
Comprehensive Site Investigation Report V3 Companies, 32
Spartans’ Square Shopping Center May 2010