11625 AIRPORT RD SONRISE CHRISTIAN CENTER Geotech Report 2022-10-25

I I GEOTECHNICAL EVALUATION EVERETT, WASHINGTON February 6, 2018 PORTLAND CEMENT CONCRETE(RIGID) PAVEMENT Min. PCC Depth Aggregate Base* Compacted Subgrade* ** 6.o in. 6.o in. 12.o in. *95%compaction based on ASTM Test Method D1557 **A proof roll may be performed in lieu of in place density tests The asphaltic concrete depth in the flexible pavement tables should be a surface course type asphalt,such as Washington Department of Transportation (WSDOT) 1/2 inch HMA. The rigid pavement design is based on a Portland Cement Concrete (PCC)mix that has a 28 day compressive strength of 4,00o pounds per square inch (psi). The design is also based on a concrete flexural strength or modulus of rupture of 55o psi. 9.0 Construction Field Reviews Cobalt Geosciences should be retained to provide part time field review during construction in order to verify that the soil conditions encountered are consistent with our design assumptions and that the intent of our recommendations is being met.This will require field and engineering review to: I . Monitor and test structural fill placement and soil compaction • Monitor temporary excavation stability ■ Observe proof rolls of roadway subgrade prior to asphalt placement Geotechnical design services should also be anticipated during the subsequent final design phase to support the structural design and address specific issues arising during this phase. Field and engineering review services will also be required during the construction phase in order to provide a Final Letter for the project. 10.o Closure This report was prepared for the exclusive use of Sonrise Christian Center and their appointed consultants.Any use of this report or the material contained herein by third parties,or for other than the ' intended purpose,should first be approved in writing by Cobalt Geosciences,LLC. The recommendations contained in this report are based on assumed continuity of soils with those of our test holes, and assumed structural loads. Cobalt Geosciences should be provided with final architectural and civil drawings when they become available in order that we may review our design recommendations and advise of any revisions,if necessary. Use of this report is subject to the Statement of General Conditions provided in Appendix A. It is the responsibility of Sonrise Christian Center who is identified as"the Client"within the Statement of General Conditions, and its agents to review the conditions and to notify Cobalt Geosciences should any of these not be satisfied. PO Box 82243 9 Kenmore,WA 98028 331-1097 Cobol geo@gm Cobaltgeo(�gmail.com