7.2. HRSR 08-02-2021 - Laserfiche WebLink

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Preliminary Report of Geotechnical Exploration Main & Gates Redevelopment; Elk River, Minnesota AMERICAN July 9, 2021 ENGINEERING Report No. P-0001445 TESTING, INC. Page 2 of 10 4.0 SUBSURFACE EXPLORATION AND TESTING 4.1 Field Exploration Program The subsurface exploration program conducted for the project consisted of four (4) standard penetration test borings. AET in conjunction with the client determined the number of borings, boring locations, and boring depths. The logs of the borings and details of the methods used appear in Appendix A. The logs contain information concerning soil layering, soil classification, geologic origins, and moisture condition. A density description or consistency is also noted for the natural soils, which is based on the standard penetration resistance (N-value). The boring locations are shown on Figure 1 in Appendix A. The borings were located in the field by AET personnel by taping from nearby site features. Surface elevations were measured in the field by AET personnel using an engineer's level. The benchmark reference was the top nut of the hydrant located in the northeast corner of the intersection of Main Street and Gates Avenue, with an assigned elevation of 100.0 feet. 4.2 Laboratory Testing The laboratory test program included a sieve analysis on the sandy soil. The test results appear in Appendix A on the individual boring logs adjacent to the samples upon which they were performed, or on the data sheets following the logs. 5.0 SITE CONDITIONS 5.1 Surface Observations The existing parcel is a combination of previous single family lots that consisted of homes which have been demolished. The parcel has undergone some tree removals and grading activities associated with demolition of the previous homes. Please provide us with records of the site activities, if available, that shows the location and depth of removals and which residences had basements. Records of fill placement would also be helpful. The site has a general downward slope from southwest to northeast with elevations at the boring locations ranging from 96.3 feet at Boring SB-1 down to 89.3 feet at Boring SB-3. Draft