Carnow Conibear conducted investigation activities associated with the Illinois Environmental Protection Agency (IEPA) Site Remediation Program (SRP) at the Henry Horner Homes Redevelopment - Area B (HHHR - Area B) site.
Carnow Conibear conducted investigation activities associated with the Illinois Environmental Protection Agency (IEPA) Site Remediation Program (SRP) at the Henry Horner Homes Redevelopment - Area B (HHHR - Area B) site. The site consists of approximately seven acres. Carnow, Conibear conducted a Comprehensive Site Investigation (CSI) activities in accordance with Illinois Administrative Code Title 35 Part 740 (35 IAC 740) and applicable IEPA regulations. The CSI activities consisted of updating the Phase I Environmental Site Assessment (ESA) previously prepared by Carnow, Conibear, performing soil borings at the site and collecting and analyzing soil samples.
The goal of the CSI was to characterize and delineate potential contamination associated with the recognized environmental conditions (RECs) identified at the site. The RECs consisted of the potential presence of underground storage tanks (USTs) at the site and the historical industrial/commercial uses of the site and adjacent properties. The CSI identified several contaminants of concern above the soil ingestion, soil inhalation, and the groundwater ingestion (soil component) exposure routes.
Carnow Conibear performed an endangerment assessment for the site in accordance with 35 IAC 740 and applicable IEPA regulations. The purpose of the endangerment assessment was to determine remediation objectives and propose corrective measures to eliminate or prevent exposure to the identified COCs at the site. Carnow Conibear utilized Tier 2 and Tier 3 evaluations using Risk-Based Corrective Action (RBCA) and Soil Screening Level (SSL) methodologies, as defined in 35 IAC 742, to assess potential exposures to human health and environment. Specifically, Carnow Conibear utilized engineered barriers and the City of Chicago groundwater ordinance to eliminate the applicable exposure pathways. Carnow Conibear also used analytical data to demonstrate that remediation of PNA impacts on historically residential portions of the site were impractical to remediate. This approach will greatly reduce the area of the site requiring the installation and maintenance of engineered barriers.
The Remedial Action Plan (RAP) for the site utilized the establishment of soil management zones (SMZs) to allow for the reuse of impacted soils as structural backfill, placement of engineered barriers over impacted soils to preclude potential exposures, and institutional controls consisting of a No Further Remediation (NFR) letter and notification of potentially affected adjacent property owners. The CSI, ROR, and RAP were incorporated into one (1) report to reduce Carnow Conibear’s reporting costs and IEPA’s review fees. This project was funded by the Chicago Housing Authority through the Chicago Department of Environment.