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City of Arden Hills <br />Project B2502087 <br />May 15, 2025 <br />Page 2 <br /> <br /> <br />Sample Analytical Parameters <br /> <br />Five samples were analyzed for the baseline sediment parameters pursuant to MPCA guidelines. <br />The parameters were as follows: <br /> <br /> Metals – arsenic, cadmium, chromium III, chromium VI, copper, lead, mercury, nickel, <br />selenium, and zinc by SW-846 EPA 6020/7471B. <br /> <br /> Total phosphorus using method EPA 365.1. <br /> <br /> Nitrate & nitrite using EPA 353.2. <br /> <br /> Ammonia nitrogen using EPA 350.1. <br /> <br /> Total Kjeldahl nitrogen using EPA 351.2. <br /> <br /> Polychlorinated biphenyls (PCBs) using method SW-846 8082A. <br /> <br /> Total organic carbon using SW-846-9060. <br /> <br /> Extended List, Polycyclic Aromatic Hydrocarbons (PAHs) using EPA 8270E SIM. <br /> <br />Results <br /> <br />Sediment Profile <br />Sediments observed during the completion of the borings consisted primarily of a dark brown to black <br />silty sand. Organic/decay odors were noted in the material collected from the O-2 through O-5 borings. <br /> <br />Sediment Chemistry <br />The results of laboratory analysis are summarized in Table 1. The laboratory analytical reports are also <br />enclosed. <br /> <br />PAHs <br /> PAHs were detected at or above the reporting limit within each sample analyzed. <br />Non-carcinogenic PAHs were not reported at concentrations greater than Tier 1 SRVs. <br />The benzo(a)pyrene (BaP) equivalent for the samples varied. Calculated concentrations <br />ranged from below the Tier 1 and 2 Soil Reference Values (SRVs) within O-1, to between the <br />Tier 1 and 2 SRVs within O-2, O-4, and O-5, to above the Tier 2 SRV within O-3.