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Kraus-Anderson Realty Company <br /> Project BL-11-01014 <br /> March 18, 2011 <br /> Page 13 <br /> We note that with leaving the swamp deposits in place under new and existing fill soils,the possibility <br /> still exists for excessive settlement to occur.The owner must be willing to accept this risk, if not; <br /> additional measures will need to be taken to remediate the swamp deposits.These measures would <br /> include the removal of all swamp deposits under paved areas and replacement with new engineered fill. <br /> D.6.a. Subgrade <br /> We recommend that all topsoil, near surface unsuitable fill soils, soft native clays,and/or relic <br /> construction debris be removed from beneath paved areas at this site.After subgrade preparation,we <br /> anticipate that pavement subgrade soils will primarily consist of existing and new fill soils. Laboratory <br /> tests to determine the Hveem stabilometer R-value of these soils were not included in our scope of <br /> services. Based on our experience with similar soils, we have assumed an R-value of 12 for our design. <br /> We recommend heavy surface compaction of the pavement subgrades with several passes of a self- <br /> propelled,vibratory drum compactor prior to construction.This will help densify any loose fill material, <br /> improving subgrade strength and reducing the potential for settlement. <br /> D.6.b. Proofrolls <br /> Prior to the placement of aggregate base course,we recommend subgrade soils be proofrolled with a <br /> fully-loaded,tandem-axle truck and observed by a geotechnical engineer, or qualified representative. <br /> This will assist in identifying any soft or weak areas that will require soil correction.Typically areas that <br /> pump or rut more than 1 inch due to wheel traffic should be corrected. Failed areas should be re- <br /> compacted, or if too wet, subcut and replaced with suitable soil and compacted as specified for fill <br /> material. <br /> D.6.c. Bituminous Pavement Sections <br /> For a properly prepared subgrade consisting of fill material and the assumed traffic intensities (see <br /> Section C), we recommend a minimum 3 1/2-inches of bituminous asphalt pavement overlying 12 inches <br /> of aggregate base course over a geotextile separation fabric for use in paved parking and drive ways at <br /> this site. <br /> The above pavement designs are based upon a 20-year performance life.This is the amount of time <br /> before major reconstruction is anticipated.This performance life assumes maintenance, such as seal <br /> coating and crack sealing, is routinely performed.The actual pavement life will vary depending on <br /> variations in weather,traffic conditions and maintenance. <br /> BRAUN <br /> INTERTEC <br />