Laserfiche WebLink
Report of Geotechnical Exploration <br />West Armstrong Redevelopment Area, Ramsey, Minnesota <br />March 30, 2022 <br />AET Report No. P-0004952 <br />4.0 SUBSURFACE EXPLORATION AND TESTING <br />AMERIAN <br />ENGINEERING TESTING <br />4.1 Field Exploration Program <br />The subsurface exploration program conducted for the project consisted of 3 standard <br />penetration test borings. The number of borings, boring locations, and boring depths were <br />determined by Bolton & Menk. The logs of the borings and details of the methods used appear <br />in Appendix A. The logs contain information concerning soil layering, soil classification, geologic <br />origins, and moisture condition. A density description or consistency is also noted for the natural <br />soils, which is based on the standard penetration resistance (N-value). <br />The boring locations are shown on Figure 1 in Appendix A. The borings were located in the field <br />by AET personnel by taping from nearby site features. Surface elevations were approximated <br />based on the web application MnTOPO. <br />4.2 Laboratory Testing <br />The laboratory test program included water content testing and percent passing the #200 sieve <br />tests. The test results appear in Appendix A on the individual boring logs adjacent to the samples <br />upon which they were performed. <br />5.0 SITE CONDITIONS <br />5.1 Surface Observations <br />The bituminous roadway surface is in poor condition. The roadway has no curb or gravel <br />shoulder; the shoulder area consists of grass with commercial/industrial businesses beyond the <br />shoulder. The elevation of the roadway slopes downward from south to north with elevations <br />from 874.8 to 869.3 feet at the boring locations. Driveways for the businesses connect to the <br />roadway. <br />5.2 Subsurface Soils/Geology <br />The site geology consists of fill or topsoil overlying naturally deposited alluvial soils. <br />5.2.1 Bituminous Pavement/Fill <br />Bituminous pavement overlying fill or possible fill was encountered at the surface of Borings SB- <br />2 and SB-3. The surface consisted of 2% to 2% inches of bituminous pavement with <br />approximately 8 inches of apparent gravel base. Beneath the aggregate base, silty sand and <br />sand with silt layers encountered to depths of approximately 2 to 4 feet beneath existing grade. <br />The sands with silt from 2 to 4 feet below grade were classified as "Coarse Alluvium or Fill" as <br />Page 2 of 7 <br />