Laserfiche WebLink
Rolling Hills Development Environmental Sampling Report <br />Elk River, Minnesota <br />October 10, 2023 <br />AET Report No. P-0025977 eAM E R IC.4N <br />no1neersana resrino- <br />3.2 Classification Methods <br />Sediment samples obtained in the field were visually/manually classified in general accordance with the <br />Unified Soil Classification System (USCS) described in ASTM: D 2488. Soil screening notes are <br />included in Appendix C. <br />3.3 Laboratory Analysis <br />AET submitted one sediment sample from each of the two hand augers advanced in the stormwater <br />pond area to Pace Analytical for laboratory analysis of the following parameters: <br />• arsenic <br />• copper <br />'31 <br />cPAHs <br />Appendix B includes the laboratory analytical report. <br />3.4 Reference Standards <br />In this report, we compare the analytical results to the baseline environmental regulatory standards in <br />use by the MPCA. The reference standards are included in the results tables for comparison with <br />assessment results. The following reference standards apply to potential contaminant exposures in <br />soils: <br />MPCA Tier 1 Residential Soil Reference Values (SRVs): Compound -specific values for long- <br />term soil exposure in unrestricted -use settings (i.e., residential) above which an unacceptable <br />risk to human health is predicted to exist. Soils below Tier 1 SRVs are suitable for reuse in <br />residential settings. <br />• MPCA Tier 2 Industrial SRVs: Compound -specific values for long-term soil exposure in <br />industrial -use settings above which an unacceptable risk to human health is predicted to exist. <br />Soils below Tier 2 SRVs are suitable for reuse in industrial settings. <br />• MPCA Tier 1 Screening Soil Leaching Values (SLVs): Compound -specific values in unsaturated <br />soils above which an unacceptable risk of leaching to groundwater and/or receptors is predicted <br />to exist. <br />4.0 RESULTS <br />4.1 Sample Locations <br />Sample locations were selected at the inlet and outlet of each pond. AET scouted these locations and <br />was able to access all locations for sampling. <br />Page 2 of 4 <br />