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City of Arden Hills Project B2502087 May 15, 2025 Page 3 PCBs  PCBs were not detected at or above the laboratory reporting limit in the samples analyzed, thus total reported PCBs for each analyzed sample were below the Tier 1 and 2 SRVs. Metals  Cadmium, hexavalent chromium, selenium and mercury were not detected at or above the reporting limit (RL) within the sample analyzed.  Arsenic, total chromium, copper, lead, nickel and zinc were detected at concentrations above the laboratory reporting limit within the sample analyzed. However, the concentrations were less than the Tier 1 and Tier 2 SRVs established for each compound. Other Ammonia, total Kjeldahl nitrogen, nitrate + nitrite, total phosphorous, and total organic carbon were detected at various concentrations in the samples. Management criteria have not been established for these compounds. We understand that the MPCA requirement to include these compounds is geared toward end-use of the dredged sediments and the results should be provided to disposal facilities or receiving parties for their use. Additional consultation with the MPCA regarding land application criteria and approvals may be required. Please refer to Table 1 for a detailed summary of the analytical results. Quality Assurance/Quality Control A data quality assessment of field procedures and laboratory reports was performed to determine the effect of any deviations on data quality and used to support project objectives. All applicable Braun Intertec SOPs were followed as prescribed unless otherwise noted in this report. Notable findings are provided in more detail below and incorporated, where necessary, into this report. Soil samples were placed in clean, laboratory-supplied containers, preserved, labeled, and transported to Eurofins laboratory in Cedar Falls, Iowa and Pace laboratory in Minneapolis, Minnesota under refrigerated conditions using chain-of-custody procedures. Eurofins subcontracted hexavalent chromium to Eurofins laboratory in Pittsburgh, Pennsylvania and total organic carbon (TOC) analysis to Eurofins laboratory in Arvada, Colorado. Chain-of-custody forms were reviewed at sample check-in and determined to be in general agreement with the contents of the sample coolers. Analyses were performed using EPA or other recognized standard procedures, and samples were analyzed within the EPA recommended holding times.