Laserfiche WebLink
<br />City of Centerville <br />c/o Bonestroo <br />May 27, 2009 <br />Page3 of 3 <br /> <br />The planned street section to be placed above the wood chip fill would then consist of the 3Y, <br />inches of bituminous over 8 inches of Class 5 aggregate base, which would then be placed upon <br />24 inches of Select Granular Borrow. With this section comprising the upper approximately 3 <br />feet of the profile, the wood chip fill would then vary from about 4 feet thick in the Deep Swamp <br />Area to 2 foot thick in the Shallow Swamp Area. <br /> <br />The wood chip fill does not require vibratory compaction. Rather, the chips should be placed in <br />lifts and compacted with construction equipment. It is often desired to have the compaction done <br />with rubber tired hauling trucks, although due to the sensitivity of at least the lower zones of the <br />fill, this compaction can be done with tracked dozer equipment. Generally, four passes with this <br />equipment should suffice, although engineering adjustments may need to be made in the field <br />depending on the actual equipment used and on observations of the compaction process. The <br />initial lift of fill can be 2 foot thick. We then recommend using I foot lifts above this. <br /> <br />Below is a common specification for wood chip fill: <br /> <br />Wood chips shall be cut from sound live trees of any species and may be either "clean <br />chips" cut from debarked tree trunks or "total tree chips" cut from whole trees (including <br />bark and branches, but excluding leaves). The chips shall have a minimum nominal <br />length of % inches, a width of Y, inch or more, and a maximum fiber length of 6 inches. <br /> <br />We understand geotextile fabric is planned for this project. It should not be necessary to place a <br />geotextile fabric between the wood chip fill and the native soils within the excavation bottom. <br />However, the geotextile fabric should be placed between the wood chips and the Select Granular <br />Borrow material. <br /> <br />3.0 Closing <br />If you have any further questions regarding our recommendations presented, please do not <br />hesitate to contact us. <br /> <br />Sincerely, <br /> <br />Reviewed by: <br /> <br />Z~E"I-~~i:I"' <br />a2oyen, PE <br />Vice President, Geotechnical Division <br />(65]) 659-1305 <br /> <br />American Engineering Testing, Inc. <br /> <br />..P;:'/ ~ <br />~/.. <br />.. .- <br /> <br />arson <br />Senior Engineering Assistant <br />(651) 659-1363 <br />