1110 RAINIER AVE A DOMESTIC VIOLENCE SERVICES OF SNO CO 2018-01-01 MF Import

� Everett Housrn9Aufhurify Ntay 16, 2012 PAVEMENT AREAS � JN 12080 Page 11 The pavement section may be suppr�ted on competent, native soil, on structural fill, or on exisling fill compacled to a 95 percent density. Because the site soils are silty and moisture sensitive, we recommend that the pavement subgrade must be in a stable, non-yielding condition at the time of paving. Granular structural fill or geotextile fabric may be needed to stabilizo soft, �vet, or unstable areas. To evaluate pavement subgrade sirength, �ve recommend thal a proof roll be completed with a loaded dump truck immediately before paving. In most ins;ances where unstable subgrade condifions are encountered, an additional 12 inches of granul�r structural fii; will stabilize lhe subgrade, except for very soft areas where additional fi{I could be required. Thc� subgrade should be evaluated by Geotech Consultants, inc., after the site is stripped and cut to grade. Recommendations for the compaction of structural fill beneath pavements are given in the section enlilied General Earthwork and Structural Fill. The performance of site pavemenis is directly related to the strength and stability of ihe underlying subgrade. The pavement (or lightly loaded lreffic and parking areas s'�ould consisl of 2 inches of asphalt concrete (AC) over 4 inches of crushed rock base (CRB) or 3 inches o( asphalt-treated 'oase (ATB). We recommend providing heavily loaded areas with 3 inches of AC over 6 inches of CRB or 4 inches of ATB. Heavily loaded areas are typically main driveways, dumpster sites, or areas with truck lraffic. Increased maintenance and more frequent repairs shouid be expected if thinner pavement sections are used. Water from planter areas and other sources should not 6e allowed to infiltrate into the pavement subgrade. The pavement section recommendations and guidelines presented in tliis report are based on our experience in the area and on what has been successful in similar situations. As wlth any pavements, some maintenance and repair of limited areas can be expected as the pavement ages. Cracks in the pavement should be sealed as soon as possible after they become evident, in order to reduce lhe potential for degradation of the subgrade from infiltration of surface water. For the same reason, it is also prudent to seal the surface of the pavement atter it has been in use for several years. To provide for a design without the need tor any maintenance or repair would be uneco�omical. GENERAL EARThWORK AND STRUCTURAL FILL All buiiding and pavement areas should be stripped cf su.rface vegetation, topsoil, organic soil, and other doleterious material. The stripped or removed materials should not be mixed �vith any materials lo be used as structural fll, but they could be used in non-slruclural areas, such as landscape beds. Struclural fill is defined as any (iil, including utility backfill, placed under, or close to, a building, behind permanent retaining or foundation walls, or in other areas �vhere the underlying soil needs to supporl loads. All siructural fill should be placed ir. horizontal lifts with a moisture content at, or near, the oplimum moisture content. The optimum molsture content is that moisiure content that results in lhe greatesl compacted dry density. The moisture content of fill is very importani and must be closely controlled during the fillirg and compaction process. The allo�vable ihickness of the fill lift will depend on the materlal type selected, the compaction equipmenl used, and the number of passes made to compact the Ilft. The loose lift thickness should not exceed 12 inches. We recommend testing the fill as it is placed. If ihe till is not sufficiently compacted, it can be recompacted befora another lift is placed. This eliminates the GEOTECH CONSULTANTS,INC.