6101 ASSOCIATED BLVD BASE FILE 2017-06-05

Underwood Gartland Everett, LLC ES-2232.02 February 6, 2015 Page 9 For lightly loaded pavement areas subjected primarily to passenger vehicles, the following preliminary pavement sections can be considered: • Two inches of HMA placed over four inches of crushed rock base (CRB), or; • Two inches of HMA placed over three inches of asphalt treated base (ATB). The HMA, ATB and CRB materials should conform to WSDOT specifications. All soil base material should be compacted to at least 95 percent of the maximum dry density. Rigid Concrete Pavement In our opinion concrete pavement consisting of an unreinforced slab of five and one-half inches in thickness over at least four inches of crushed rock base can be considered for this project. Typical of asphalt pavement sections, the concrete pavements should be supported on a firm and unyielding subgrade, as confirmed by the geotechnical engineer. LIMITATIONS The recommendations and conclusions provided in this geotechnical engineering study are professional opinions consistent with the level of care and skill that is typical of other members in the profession currently practicing under similar conditions in this area. A warranty is not expressed or implied. Variations in the soil and groundwater conditions observed at the test locations may exist, and may not become evident until construction. ESNW should reevaluate the conclusions in this geotechnical engineering study if variations are encountered. Additional Services ESNW should have an opportunity to review the final design with respect to the geotechnical recommendations provided in this report. ESNW should also be retained to provide testing and consultation services during construction. Earth Solutions NW, LLC