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Rolling Hills Development Environmental Sampling Report <br />Elk River, Minnesota <br />October 10, 2023 <br />AET Report No. P-0025977 AIM IN SCAN <br />€HGINEEHlNG TESTING <br />6.0 RECOMMENDATIONS <br />During excavation, the water level should be kept below any outlets of the stormwater management <br />area for the duration of the sediment excavating activity, or the discharge must be protected or <br />controlled in such a manner as to prevent turbid water and/or dredged sediment from being released to <br />a water resource. We recommend the water in the stormwater management area be drained as much <br />as possible. <br />The MPCA May 2017 Stormwater Sediment Manual recommends that best management practices <br />(BMPs) for erosion and sediment control should be employed at the site as well as the location where <br />sediment is temporarily stockpiled. The MPCA also recommends that records of all dredge projects <br />(e.g., reports, permits, plans, waste manifests, etc.) be maintained by the owner and operator of the <br />stormwater management facilities. <br />7.0 STANDARD OF CARE <br />The data derived through this sampling program have been used to develop our opinions about <br />subsurface conditions. However, because no sampling program can reveal totally what is in the <br />subsurface, conditions between samples, and at other times, may differ from conditions described in <br />this report. The sampling we conducted identified soil conditions only at those points where we took <br />samples. Depending on the sampling methods and sampling frequency, every soil type may not be <br />observed, and some materials or layers which are present in the ground may not be documented. <br />AET has endeavored to perform services for this project in a manner consistent with the level of skill <br />and care ordinarily exercised by other members of the profession currently practicing in this area, under <br />similar budgetary and time constraints. No additional warranty, express or implied, is made. <br />This report is based on our current understanding of the project. If conditions differing from our original <br />understanding or findings are identified, AET should be consulted to determine if there are material <br />impacts on our conclusions or recommendations. <br />Page 4 of 4 <br />