2000 TOWER ST ARTS AND SCIENCES BLDG 2018-01-02 MF Import

Sloped to Drain Away from 40 Structure 1/ Pavement or 24" Impervious Soil Retained Soil — Temporary Excavation Slope 12 Min. Cover of 1, Drainage Material I (6" Min. on Sides I of Pipe) 4" Exterior Wall Wall Drainage Material 2' Min. Damp Proofing Floor Slab Perforated Drain Pipe Vapor Retarder 1 6' Min. T Capillary Break o MATERIALS 31111111111111 In A. WALL DRAINAGE MATERIAL: May consist of washed 3/8" to No. 8 pea gravel. Alternatively the awall drainage material may consist of "Gravel Backfill for Drains" per WSDOT Standard 0 Specification 9-03.12(4), surrounded with a non —woven geotextile such as Mirafi 140N (or approved equivalent). a B. RETAINED SOIL: Should consist of structural fill, either on —site soil or imported. The bockfill = should be compacted in loose lifts not exceeding 6 inches. Wall backfill supporting building floor slabs should consist of imported sand and gravel per WSDOT Standard Specification X 9-03.14 or City of Seattle Type 17 compacted to at least 95 percent ASTM D1557. Backfill Q not supporting building floor slabs, sidewalks, or pavement should be compacted to 90 to 92 percent of the maximum dry density, per ASTM D1557. Backfill supporting sidewalks or o pavement areas should be compacted to at least 95 percent in the upper two feet. Only (a hand —operated equipment should be used for compaction within 5 feet of the walls and no heavy equipment should be allowed within 5 feet of the wall. Ir WC C. CAPILLARY BREAK: Should consist of at least 6 inches of clean crushed gravel with a Nmaximum size of 1-1/2 inches and negligible sand or fines. D. PERFORATED DRAIN PIPE: Should consist of a 4—inch diameter perforated heavy —wall solid /. pipe (SOR-35 PVC) or rigid corrugated polyethylene pipe (ADS N-12) or equivalent. Drain o pipes should be placed with 0.5 percent minimum slopes and discharge to the storm water c� collection system. WALL DRAINAGE AND BACKFILL GWENGINEER� FIGURE 3