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�d..+�t�Y�°�i'��.d <br /> , Hennepin County <br /> AET Project No. 09-00552 <br /> July 7, 2017 <br /> Page 4 of 4 <br /> Preparation of the tower base subgrade should involve removal of any vegetation and any <br /> organic soil with over 3 percent organic content by weight from within the tower base area and a <br /> minimum 3-foot oversize area. Additional excavation should be completed as necessary to allow <br /> placement of a minimum of 6 inches of Class 2 aggregate base. <br /> Prior to placement of the aggregate base, the exposed subgrade should be surface-compacted <br /> with a minimum of four passes with a vibratory compactor having a minirnum dynamic force of <br /> 15,000 pounds. The aggregate base should then be placed and compacted to a firm, non-yielding <br /> condition. <br /> Procedures <br /> The hand auger boring was drilled with a 1'/2-inch diameter hand auger. The borings were <br /> advanced in 4- to 6-inch increments to depth of 9.5 feet below the ground surface. The auger was <br /> withdrawn from the borehole after each advancement to obtain soil cuttings. <br /> The dynamic cone penetrometer (DCP) tests were completed in general accordance with ASTM <br /> International Standard Test Method D6951. <br /> Remarks <br /> It has been a pleasure assisting you with this project. Please contact us if you have any questions <br /> regarding our results or this report. <br /> Sincerely, <br /> American Engineering esting, Inc. <br /> . ��� <br /> Daniel J. Larso P Loren Braun, PE <br /> Principal Enginee Principal Engineer <br /> MN Lic. No. 19649 <br /> Phone: 651-659-1337 <br /> dlarson@amengtest.com <br /> Attachments: Subsurface Boring Logs <br /> Photograph of In Situ Load Test Set Up <br />