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October 19, 2021 <br />Page in of 12 <br />Geotechnical Evaluation <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 />**Aproof 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 <br />asphalt, such as Washington Department of Transportation (WSDOT) Y2 inch HMA. The rigid <br />pavement design is based on a Portland Cement Concrete (PCC) mix that has a 28 day <br />compressive strength of 4,000 pounds per square inch (psi). The design is also based on a <br />concrete flexural strength or modulus of rupture of 550 psi. <br />CONSTRUCTION FIELD REVIEWS <br />Cobalt Geosciences should be retained to provide part Lime field review during construction in <br />order to verify that the soil conditions encountered are consistent with our design assumptions <br />and that the intent of our recommendations is being met. This will require field and engineering <br />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 foundation drainage placement <br />• Verify soil conditions at stormwater system locations <br />• Observe excavation stability <br />Geoteehnical design services should also be anticipated during the subsequent final design phase <br />to support the structural design and address specific issues arising during this phase. Field and <br />engineering review services will also be required during the construction phase in order to <br />provide a Final Letter for the project. <br />CLOSURE <br />This report was prepared for the exclusive use of Rick Hardt and his appointed consultants. Any <br />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 />The recommendations contained in this report are based on assumed continuity of soils with <br />those of our test holes and assumed structural loads. Cobalt Geosciences should be provided with <br />final architectural and civil drawings when they become available in order that we may review our <br />design recommendations and advise of any revisions, if necessary. <br />Use of this report is subject to the Statement of General Conditions provided in Appendix A. It is <br />the responsibility of Rick Hardt who is identified as "the Client' within the Statement of General <br />Conditions, and its agents to review the conditions and to notify Cobalt Geosciences should any of <br />these not be satisfied. <br />www.cobaltgeo.com (2o6) 331-1097 <br />