9001 AIRPORT RD Geotech Report 2018-01-02 MF Import (2)

i I Subswface FaP�°�°tion, Geologic Hazm'd, and PreliminwY Geo�echnica!Engineeri,•�Report Sho-/slt SkALs Cente�Addi�ioe Prelimi Desi Reconunendarions Everetf, Wathin ton I 12.0 FLOOR SUPPORT CONSIDERATIONS g�ab-on-grade floors may be used over structural fill or the medium dense to very dease lodgement ti11. For design purposes, a vertical modulus of subgrade reaction of 50 pounda p� cubic inch (p��) can be used for floor slabs co��siNcted over properly piaced and comp structural fill. Slab-on-grade floors should not be placed on existing fill soils. Where moisture migration through slabs is to be controlled, the floor sboe� bT6e fl otr�phould a oube protected fr m wasbed rcek or pea gravel to act as a c:apillary dampness by an impervious moisture bazrier at least 10 mils ir. �hickness 13.0 PAVEMENT DESICiN RECOMMENDATIONS We anticipate that asphalt paving will be used for the new drive and pazking azeas. Asphalt pavement design is a compromise between initial cost and expected design life. In order to provide a 20-year design life with normal maintenance, we recommend a pavement section consisdng of 2'/z inches of asphalt surfacing above 6 inches of crushed surfacing base course, per WSDOT Standazd Specification 9-03.9[3], above a granular subgrade compac:ed to at Ieast 95 percent of the modified Proctor ma�cimum d►Y density, as determined bY A3TM:D 1557. Areas that will be used for delivery trucks, buses, gazbage trucks, or other heavy vehicles 6 inches of�compacted �ushedlsurfaccmg baescour eoover a 95 percelntscompacted granu�u subgrade. We anticipate that Porcland cement concrete (PCC) will be used for walkways and courtyards. We recommend a concrete sidewalk and courtyazd section consisting eT WSDOT Standazd surfacing above a nunimuu� of 4 inches of crushed surfacing top course, p Specification 9-03.9(3], above a subgrade compacted to at least 95 percent of che modified Proctor maximum dry densiry, as determined by ASTM:D 1557. Aceas chat will be crossed by delivery �cks, buses, gazbage trucks, or other heav}' �ehicles should be designed nsinB a crushed surfac g top course aboeCa subgrade co pacted toat least 95 percentP.s °f compacted Afrer the azeas to be paved aze stripped and�or excavated to pavement subgrade elevation, the exposed ground should be compacted to at least 95 percent of ASTM:D 1557, or to a firm and unyielding condition, as determined by che geotechnical e�gineer or his representative. We recommend proof-rolling pavement subgrades that will underlie vehicle traffic with a loaded g,unp truck to identify any soft or yielding areas. If required, structural fill may then be placed to achieve desired subbase grades. Upon completion of the compaction and structural fill placement, the pavement secdon for the design level of services can be constructed. ASSOC7ATED EAR771 SCIENCES.!N�• �w,e 1�, 2003 Page 16 Fr;nC-EF.Md173A3-P�olerl�2CtlB�2i3��