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. � <br /> Project Number: 016-0019-5391 Page 4 <br /> should be compacted in layers to at least 95 percent of the Standard Proctor maximum dry <br /> density. <br /> Using free-draining granular backfill,the foundation walls should be designed for an at-rest <br /> earth pressure coefficient of 0.4 or an equivalent fluid pressure of 50 pounds per cubic foot <br /> (pcf). This considers the backfill has a unit weight of 125 pcf. <br /> In addition to the soil pressure, water entering behind the walls may exert more pressures. <br /> Therefore, an exterior drainti►e system may be installed for the below grade foundation walls. <br /> The draintile system should be installed below the level of the lowest footing on the outside of <br /> the dock foundation wall, and should be surrounded by at least 6" of washed, coarse aggregate <br /> material which is enveloped in a geotextile fabric. The draintile should be connected to a <br /> suitable outfall or sump where water can be discharged from the system. We are including a <br /> typical exterior draintile system sketch. <br /> All excavations should comply with the requirements of O.S.H.A. 29 CFR, Part 1926, Subpart P, <br /> "Excavations and Trenches". This document states that excavation safety is the responsibility of <br /> the contractor. Reference to these O.S.H.A. requirements should be included in the project <br /> specifications. <br /> Professional judgments and recommendations are presented in this report. They are based <br /> partly on evaluation of the technical information gathered, partly on historical reports and <br /> partly on our general experience with subsurface conditions in the area. We do not guarantee <br /> the performance of the project in any respect other than that our engineering work and the <br /> judgment rendered meet the standards and care of our profession. It should be noted that the <br /> borings may not represent potentially unfavorable surface conditions between borings. The <br /> recommendations presented in this report are applicable only to this specific project. These <br /> data should not be used for other purposes. <br /> If there are any questions regarding the data or recommendations, please call us at <br /> 763.502.9945. <br /> Geo Engineering Consultants, Inc. <br /> .� <br /> Ahsanur R. Siddique, P.E. <br /> Geotechnical Engineer <br /> I hereby certity that this plan,specification,or report was prepared <br /> by me or under my direM supervision that I am a duly Registered <br /> Professional Engineer under the laws of the State of Minnesota. <br /> �� <br /> Date 8/23/2016 Registration No.22099 <br /> Cs@O Engineering Consu/tants Inc <br />