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GEOTECHNICAL INVESTIGATION <br />EVERETT, WASHINGTON <br />October 28, 2019 <br />HEAVY DUTY <br />COBALT <br />G E 0 S C I E N C E S <br />Asphaltic Concrete <br />Aggregate Base* <br />Compacted Subgrade* ** <br />3.0 in. <br />6.o in. <br />12.0 in. <br />PORTLAND CEMENT CONCRETE (RIGID) PAVEMENT <br />Min. PCC Depth <br />Aggregate Base* <br />Compacted Subgrade* ** <br />6.o in. <br />6.o in. <br />12.0 in. <br />* 95% compaction based on ASTM Test Method D1557 <br />**A proof roll may be performed in lieu of in place density tests <br />The asphaltic concrete depth in the flexible pavement tables should be a surface course type asphalt, such <br />as Washington Department of Transportation (WSDOT) 1/2 inch HMA. The rigid pavement design is <br />based on a Portland Cement Concrete (PCC) mix that has a 28 day compressive strength of 4,000 pounds <br />per square inch (psi). The design is also based on a concrete flexural strength or modulus of rupture of <br />550 psi. <br />9.o Construction Field Reviews <br />Cobalt Geosciences should be retained to provide part time field review during construction in order to <br />verify that the soil conditions encountered are consistent with our design assumptions and that the intent <br />of our recommendations is being met. This will require field and engineering review to: <br />■ Monitor and test structural fill placement and soil compaction <br />■ Observe bearing capacity at foundation locations <br />■ Observe slab -on -grade preparation <br />■ Monitor subgrade preparation of roadways <br />■ Observe excavation stability <br />Geotechnical design services should also be anticipated during the subsequent final design phase to <br />support the structural design and address specific issues arising during this phase. Field and engineering <br />review services will also be required during the construction phase in order to provide a Final Letter for <br />the project. <br />mo Closure <br />This report was prepared for the exclusive use of Maverick Consulting and their appointed consultants. <br />Any use of this report or the material contained herein by third parties, or for other than the intended <br />purpose, should first be approved in writing by Cobalt Geosciences, LLC. <br />9 <br />PO Box 82243 <br />Kenmore, WA 98028 <br />cobaltgeoOgmail.com <br />2o6-331-1097 <br />