comprehensive site investigation and remediation objectives report

• 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).
A summary of soil and groundwater sample analysis results in which constituent concentrations
are above applicable TACO Tier 1 ROs (COCs) are provided in Table 1.1. The following
section establishes the baseline TACO conditions at the Site, followed next by a summary of the
TACO Tier 1 evaluation.
6.2 BASELINE TACO CONDITIONS
The results of the CSI have established the baseline TACO conditions for the Site and a
delineation of the vertical and horizontal extent of COCs. The confirmed Site COCs include:
‣ Soils: VOCs
‣ Groundwater: VOCs and Metals.
The analytical results obtained through the CSI were compared to the Tier 1 ROs of Title 35 of
the Illinois Administrative Code (IAC) Part 742, Tiered Approach to Corrective Action Objectives
(TACO), effective February 15, 2007. Further, analytical and physical site data were considered
in accordance with 35 IAC Part 742, Subpart C; Exposure Route Evaluations.
6.2.1 MIGRATION PATHWAYS, EXPOSURE ROUTES AND RECEPTORS
Existing and potential migration pathways that could transport contaminants off-site include
underground utilities that exit the property, groundwater, fugitive dust, and surface water runoff.
Utility Review and Potential Migration Pathway Evaluation
Information relative to underground utilities was compiled from V3’s review of available historic
site documentation, site observations, and site engineering plans. Electrical lines for the Site
building are located overhead. Existing underground utilities located within the Site include
sanitary sewer lines, gas lines and water mains (Figure 1.3). The gas lines enter Spartans’
Square Shopping Center on the south side of the building and then run to the east where the
line connects with the main gas line, which is located in the Route 53 right of way. The water
line also enters Spartans’ Square on the south side of the building and branches to the east and
then north within an easement along Access Drive. Just north of the building, the water main
branches to the northwest through the north parking lots at the Site.
Comprehensive Site Investigation Report V3 Companies, 26
Spartans’ Square Shopping Center May 2010