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City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 8 <br />B.5. Groundwater <br />We did not observe groundwater while performing our borings. Groundwater may take days or longer <br />to reach equilibrium in the boreholes and we immediately backfilled the boreholes, in accordance with <br />our scope of work. If the project team identifies a need for more accurate determination of groundwater <br />depth, we can install piezometers. Project planning should anticipate seasonal and annual fluctuations of <br />groundwater. <br />B.6. Laboratory Test Results <br />We performed various laboratory tests on select soil samples to aid us in our evaluation. The Log of <br />Boring sheets attached in the Appendix presents the results. Table 4 provides the range of results for the <br />moisture contents, percent passing the #200 sieve, organic contents and Atterberg limits. <br />Table 4. Laboratory Classification Test Results <br />Laboratory Test Range of Results Comments <br />Moisture content (MC) tests, % <br />(per ASTM D2216) <br />Cohesionless soils: 2 to 15 <br />Cohesive soils: 11 to 26 <br />Coarse-grained soils were typically <br />dry to near the soil’s probable <br />optimum moisture content. <br />Fine-grained soils were generally <br />moist but anticipated to be at- to <br />slightly-above the probable <br />optimum moisture content. <br />Organic content (OC) tests, % <br />(per ASTM D2974) 2 Considered slightly organic as <br />classified by MnDOT definitions. <br />Percent of particles passing the <br />#200 Sieve, % <br />(per ASTM D1140) <br />2 to 17 USCS Classifications: SP, SP-SM, SM <br />Atterberg Limits (AL), % <br />(per ASTM D4318) <br />Liquid Limit (LL) – 22 <br />Plastic Limit (PL) – 17 <br />Plasticity Index (PI) – 5 <br />USCS Classification: CL-ML <br />C.Recommendations <br />C.1. Design and Construction Discussion <br />The recommendations provided herein are based on the information provided to us at the time of this <br />report. As the project progresses through final design or elements of the project are adjusted, we should <br />revisit our recommendations.