4027 4TH ST SE 2018-01-01 MF Import

January t4, 2003 HWA Proiect No. 2002-146-21 The ground surface within the construction azea should be sealed by a smooth drum vibratory roller, or equivalent, and under no circumstances should soil be left uncompacted and exposed to moisture. • Excavation and placement of fill material should be observed under the full- time observation of a representative of the geotechnical engineer, to determine that the work is consistently being accomplished in accordence with the project specifications and the recommendations contained herein. Bales of sVaw and/or geotextile silt fences should be strategically located to control erosion and the movement of soil. 4.6 STRUCTURAL PAVEMENT DESIGN Pavement section materials (i.e the CSBC) should be placed direcdy on either properly- compacted roadway fill (i.e. Gravel Bo:row), or subgrade soils prepared as recommended in Section 4.5.1. If no roadway fill is used, and the pavement section is placed directly on compacted on-site fill, the thickness of the CSBC layer should be thickened as indicated in Table 3 to account for the change. The proposed altemative flexible pavement sections were developed to support pazking and City Street / Treatrnent Plant Heavy Truck uses. Table 3: Alternative Flezible Pavement SecHons Recommended Minimum WSDOT Material Thicknesses inches Staodard DescripHon Parking Treatment Plant Specification Hea Truck ACP, Class B 3 5 9•03.8 CSBC 6 l2 6 12 9-03.9(3) Roadway Fill 12 Min 0 l2 Min. 0 9-03.I4 ACP � Asphell Concrcte Pavemrn4 �� d• For Alteme[ive Z, Ne AI:Y laya snovla oe placed in lwo 2'/.-inch IiRt — a lowa leveling course end an upper wcving course. CSBC - Cnuhed Surfecing Base Course, compected m 95°/. o( ma�imum dry dtnsiry dnertnined using AST1 D I557. The uppc 2 incha of Crushed Surfecing Baze Course mny 6e replaced by'/.•inch minue Cnithed Sutfacing Top Course (CSTC). Roadwey Fill � Gravel Borrow, compected to 95% of inezimum dry drnsiry daamined using ASTM D 1557 az the standard. WSDOT = Wachington $tate Depnnmrnt of Transportation, 2002, Slandnrd Spxificuriuns for Road Bndge, and Municipel Conswction. In azeas of existing driveways, the roadway fill requirement can be met by verifying the presence of dense granular fill soils to the required depth. 20021i6 isport • fi�al 16 HWA G80SCIENCES INC. I7