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<br /> <br />337 31ST AVENUE SOUTH · PO BOX 325 · WAITE PARK, MN 56387 <br />PHONE: 320-253-4338. FAX: 320-253-4547. EMAIL: itt@astound.net <br />WEBSITE: www.independenttestingtech.com <br /> <br />NOY S 4) 2005 <br /> <br />November 29, 2006 <br /> <br />Mr. John Anderson <br />City of Elk River <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />Re: 06-507A <br /> <br />- <br />Addendum to Report of Geotechnical Investigation <br />Irving Avenue Area Improvements <br />Elk River, Minnesota <br /> <br />Dear Mr. Anderson, <br /> <br />Our initial report dated November 13, 2006 included a recommendation for <br />pavement design bas-ed on an assUnied R-value of70. A representative sample of <br />expected subgrade material was tested for laboratory R-value. The results of that <br />test are attached. Those results indicate an R-value of 66 for the sand from boring <br />B-1 that was tested. This result is an insignificant difference and essentially <br />conf:'iifhs-out-ong-InaneCOrDiiietidatibli foia pavement design based on an R..value <br />of70. The recommended pavement section meets a 9-ton design for residential <br />streets based on this lab test and MnDot guidelines. <br /> <br />Mr.- Anderson, it has been our pleasure to be of service to you on this project. <br />Please feel free to contact us if you have any questions. <br /> <br />Sincerely, <br /> <br />- --PJi--~ - -- - - ------ ----------- <br /> <br />Patrick A. JOt-PE <br />Geotechnical Division Manager <br />Independent Testing Technologies, Inc. <br />Phone: 320-253-4338 <br />Fax: 320-253-4547 <br />