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Bolton & Menk, Inc. <br />Project B2204011.00 <br />May 9, 2023 <br />Page 2 <br /> <br />Sample Analytical Parameters <br /> <br />Each of the samples was analyzed for the following parameters: <br /> <br />ƒ Arsenic by SW-846 Environmental Protection Agency (EPA) 6020. <br /> <br />ƒ Copper by SW-846 EPA 6020. <br /> <br />ƒ Polycyclic Aromatic Hydrocarbons (PAHs) listed in Appendix A of MPCA document Managing <br />Stormwater Sediment, Best Management Practice Guidance for Municipalities. <br /> <br />Results <br /> <br />Sediment Profile <br />Sediments observed during the completion of the borings consisted primarily of a very soft, grey to black <br />silty muck throughout each of the borings. The muck was approximately 6 inches deep at the accessible <br />locations and was underlain by soils of varying types, ranging from silty sands to clays. No odors or <br />staining were noted in the sediments collected from the borings. <br /> <br />Sediment Chemistry <br />Sediment sampling results were compared to MPCA residential/recreational and commercial/industrial <br />soil reference values (SRVs) using the MPCA-prepared table template wq-strm4-79 (Revised 8/5/2021). <br />Please refer to Table 1 for a detailed summary of the analytical results. Please refer to the Quality <br />Control/Quality Assurance section below for a discussion regarding the use of “J” values in the analytical <br />tables. Based on our review of the analytical results: <br /> <br />ƒ Arsenic and copper were detected above the laboratory method reporting limits (MRL) in <br />each of the samples analyzed, but at concentrations below their respective <br />Residential/Recreational SRVs. <br /> <br />ƒ Non-carcinogenic PAHs were detected at concentrations above the laboratory MRL, but at <br />concentrations less than Residential/Recreational SRVs, in five of the six samples analyzed. <br /> <br />ƒ Carcinogenic PAHs were detected at concentrations above the laboratory MRL, but at <br />concentrations less than Residential/Recreational SRVs, in five of the six samples analyzed. <br /> <br />