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<br /> AA/EOE <br /> <br />Braun Intertec Corporation <br />11001 Hampshire Avenue S <br />Minneapolis, MN 55438 <br />Phone: 952.995.2000 <br />Fax: 952.995.2020 <br />Web: braunintertec.com <br /> <br />May 15, 2025 Project B2502087 <br /> <br /> <br />Mr. David Swearingen, PE <br />City of Arden Hills <br />1245 W Hwy 96 <br />Arden Hills, MN 55112 <br /> <br />Re: Sediment Sampling <br /> 2026 PMP Street and Utility Improvements - Karth Lake <br />Arden Hills, Minnesota <br /> <br />Dear Mr. Swearingen: <br /> <br />As authorized, Braun Intertec Corporation completed sediment sampling activities at the <br />above-mentioned Karth Lake in Arden Hills, Minnesota (the Site). The objective of the work was to <br />characterize the in-place sediment (future dredge material) for potential disposal purposes. <br /> <br />Sediment Sampling Procedures <br /> <br />The Site is located within Karth Lake. As such, our scope was based on the Minnesota Pollution Control <br />Agency’s (MPCA) current best management practice for “Managing Dredged Materials,” dated August <br />2024 (MPCA, 2024). <br /> <br />We collected five analytical samples from the proposed dredge areas, which are downstream of <br />stormwater outfalls into the lake. The samples were collected by driving a core into the underlying <br />sediment using direct push sampling equipment. <br /> <br />During sampling activities, sediment sample textures were evaluated by visual methods as the samples <br />were collected and noted in the field notes. Coring tools were cleaned prior to and between sampling <br />runs by washing the equipment with a brush and potable water containing Alconox® and rinsing the <br />equipment with deionized water. <br /> <br />The samples were transferred to clean laboratory-supplied containers, preserved in accordance with <br />Braun Intertec Standard Operating Procedures (SOPs) and transported to Pace Analytical Services <br />laboratory for analysis. Chain of Custody was initiated at the time of sampling and maintained <br />throughout the process. <br /> <br />The sample locations are depicted on Figure 1.