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Phase II Environmental Site Assessment <br />2534 Kenzie Terrace <br />WSB Project No. R-020198-000 Page 6 <br />3. Results <br />3.1 Soil Observations and Analytical Results <br />A total of eight soil samples were collected and submitted for laboratory analysis. The soil results <br />were compared to the MPCA Residential-Recreational Soil Reference Values (RR-SRVs), <br />Commercial-Industrial SRVs (CI-SRVs), Screening Soil Leaching Values (SLVs), and MPCA <br />unregulated fill criteria. For health based SRVs determined to be below background <br />concentrations, Background Threshold Values (BTVs) were used as a comparison. <br />A summary of the soil analytical testing results is included as Table 1. Concentrations that were <br />found to exceed MPCA regulatory criteria are highlighted on Figure 3. A copy of the laboratory <br />analytical report is included in Appendix C. The following is a summary of the soil sample <br />observations and analytical testing results: <br />Fill soils were encountered in the soil borings throughout the Site. The fill soil consisted <br />primarily of fine to coarse sandy clay. <br />Elevated PID readings (greater than 10 parts per million (ppm)) were identified in boring <br />B-1 from 26 to 28 feet below grade (11.2 ppm); B-2 from 18 to 24.5 feet below grade <br />(13.2-46 ppm); B-3 from 2 to 6 feet below grade (11.8-12.9 ppm), 8 to 10 feet below <br />grade (10.3 ppm), and 16 to 26 feet below grade (10.8-38 ppm); and B-4 from 10 to 24 <br />feet below grade (30.9-399 ppm). The PID screening results are included in the boring <br />logs in Appendix B. <br />Stained soil (gray) with a petroleum odor was encountered at boring B-4 from 10 to 18 <br />feet below grade. <br />Refusal was encountered in soil borings B-2 and B-4 at depths ranging from 24 to 24.5 <br />feet below grade due to the presence of bedrock. <br />Benzene was detected at a concentration of 0.172 milligrams per kilogram (mg/kg) in soil <br />sample B-4 (14-16), which is above the Screening SLV of 0.017 mg/kg but below the RR- <br />SRV and CI-SRV. Nine VOCs were detected above the laboratory reporting limits in soil <br />sample B-4 (10-12) but below regulatory criteria. No other VOCs were detected at <br />concentrations equal to or greater than the laboratory reporting limits in the remaining soil <br />samples. <br />Arsenic was detected at a concentration of 6.89 mg/kg in soil sample B-2 (10-12), which <br />is above the Screening SLV of 5.8 mg/kg but below the RR-SRV and CI-SRV. No other <br />RCRA Metals were detected at concentrations above regulatory criteria in the soil <br />samples. <br />DRO was detected in soil samples B-4 (10-12) and B-4 (14-16) at concentrations of 459 <br />and 193 mg/kg, respectively, above the MPCA unregulated fill criteria of 100 mg/kg. <br />GRO was detected in soil sample B-4 (10-12) at a concentration of 463 mg/kg, above the <br />MPCA unregulated fill criteria of 100 mg/kg. GRO was detected in soil sample B-4 (14- <br />16) at a concentration 20.6 mg/kg, below regulatory criteria. <br />3.2 Groundwater Observations and Analytical Results <br />A total of two groundwater samples (GW-1 and GW-4) were collected during this investigation. <br />The groundwater sample results were compared to the MDH Health Based Guidance (HBG)