comprehensive site investigation and remediation objectives report

‣ The exposure pathways of concern are Tier 1 soil ingestion, inhalation, soil
component of the groundwater ingestion route and direct groundwater ingestion.
Pesticides and PCBs were eliminated as Site COCs based on a review of historic environmental
assessments, Site operations and available investigation data, which indicate no evidence of
these constituents above Tier 1 ROs. Pesticides were also eliminated from consideration based
on historical data that did not indicate evidence of their release or illegal disposal at the Site.
PNAs were eliminated in soil because there were no detections above Tier 1 ROs. PNAs in
groundwater from historic well (MW-10) were identified in 2006, but V3 re-sampled the well in
2010 and PNAs did not exceed Tier 1 groundwater ROs. Refer to discussions and data found
in Sections 2.7.4, Tables 2.1 to 2.4 (soils) and Tables 3.1 to 3.2 (groundwater).
Remediation Objectives Evaluation
The first phase of a TACO evaluation is to determine if complete exposure routes exist pursuant
to Title 35 of Illinois Administrative Code (IAC) 742.300 (Subpart C: Exposure Route
Evaluation). Where a complete exposure pathway (source – transport – availability for
exposure – receptor) does not exist, development of ROs for that exposure route is not
required. An exposure route evaluation was accomplished on a constituent group specific basis
for each Recognized Environmental Condition (REC).
Evaluation of Site data indicates that conditions in the RECs achieve the TACO Subpart C
criteria for demonstrating that source material is not present, with one exception. The evaluation
of Site data indicates the following:
• Soil attenuation capacity, as measured by the conservative TACO default value of 0.2%
(2,000 mg/kg), has not been exceeded when compared to the sum of organics in each
boring (see Tables 2.1, 2.2 and 2.4).
• Soil does not exhibit pH values less than or equal to 2.0 or greater than or equal to 12.5
(see Table 2.3).
• There is no evidence of hazardous metals at the Site (investigation did not identify the
presence of RCRA metals as COCs). See Table 2.3.
• No characteristics of reactivity have been identified (see Table 2.3).
• There is no evidence of PCBs in soil in excess of 50 parts per million at the Site
(investigation did not identify PCBs as COCs). See Table 2.4 for documentation.
• The soil saturation limits for each COC have not been exceeded, with the exception of a
concentration of 800 mg/kg of tetrachloroethene at SM-GP-108 (8-11) that exceeds the
limit of 240 mg/kg. As a result, this area will require remedial efforts to allow exclusion of
exposure pathways.
• Field observations did not indicate the presence of “free product” or COC saturated soil.
As a result of the above, pathway exclusion, with the noted exception, is allowable per IAC
Section 742.300 (Subpart C: Exposure Route Evaluation).
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.
Comprehensive Site Investigation Report
V3 Companies, viii
Spartans’ Square Shopping Center May 2010