R2003-93 AUTHORIZING EXECUTION OF AGREEMENT

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Decatur,City of,Mound School Bodine Project#114675 Phase II Subsurface Investigation Report August 29 2003 After the above evaluation, Barium and Chromium could not be eliminated from further consideration. Bodine evaluated Barium and Chromium against the IEPA TACO Tier 1 SROs, as indicated in Table 2. The concentrations of Barium(180 mg/kg) and Chromium (24 mg/kg)were below the IEPA TACO Tier 1 SROs for Residential, Industrial Commercial and Construction Worker. However,the concentrations exceed the TACO Tier 1 SROs for migration to Class I and Class II groundwater. As Barium and Chromium concentrations exceeded the published background values and the TACO Tier I SROs for migration to Class I and Class II groundwater, Bodine evaluated Barium and Chromium consistent with IEPA 35 IAC 742, Appendix B, Table C: pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Component of the Groundwater Ingestion Route (Class I Groundwater). In order to conduct this evaluation, Bodine contacted the laboratory to request analysis of soil pH be conducted on the remaining sample. Bodine received a facsimile of the soil pH for boring B 12, boring from which the samples originated, on September 2, 2003. The laboratory reported a soil pH value of 7.88 for sample B12. Bodine compared the pH value to IEPA 35 IAC 742, Appendix B, Table C: pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Component of the Groundwater Ingestion Route (Class I Groundwater)to derive the TACO Tier 1 SROs of 28 mg/kg for Chromium and 1800 mg/kg for Barium. 4.4 Findings & Conclusions: Based upon review of the laboratory reported concentrations for VOCs, SVOCs and 8 RCRA analysis, Bodine finds that the concentrations of all the compounds were below the laboratory reporting limits or, for those compounds detected,the reported concentration is below the IEPA TACO Tier 1 SROs. 5.0 Fuel Oil UST Location: Bodine established the DQOs for this project as obtaining sufficient number of borings, 6, to determine the approximate location of the tank and obtain samples of sufficient quality and quantity to meet the IEPA SRP standards for obtaining a NFR letter. Bodine utilized a systematic sampling approach to locate the samples inside Mound School based upon the Decatur Public School District drawings. Measurements were taken from the drawings and correlated with interior building walls. Bodine transferred the location of the UST to the interior floors of the building. After establishing the location of the UST, Bodine located borings approximately 3 to 4 feet away from the edge of the UST, Figure 1. Due to the location of the wall and Local Area Network System in the computer room, Bodine was only able to install one boring in the center of former location of the UST. Therefore, a total of five borings were completed as indicated in Figure 1. 7 �3t)lllNt.-ENV(RONMENTAL SERVICES, INC. _ _