2012-00589 - new structure - Laserfiche WebLink

Home Browse Search

B. Drainage pipe shall be manufactured in accordance with ASTM F 405 or ASTM F 758. 2.07 Reinforced Backfill Soil A. The reinforced soil material shall be free of debris. Unless otherwise noted on the final, P.E.-sealed,retaining wall plans prepared by the Wall Design Engineer,the reinforced material shall consist of the inorganic USCS soil types GP,GW, SW, SP, SM, meeting the following gradation, as determined in accordance with ASTM D422: Sieve Size Percent Passing 1 inch 100 No. 4 20-100 No. 40 0-60 No. 200 0-35 B. The maximum particle size of poorly-graded gravels(GP)(no fines) should not exceed 3/4 inch unless expressly approved by the Wall Design Engineer and the long-term design strength (LTDS) of the geosynthetic is reduced to account for additional installation damage from particles larger than this maximum. C. The plasticity of the fine fraction shall be less than 20. D. The pH of the backfill material shall be between 3 and 9 when tested in accordance with ASTM G 51. 2.10 Geoteztile Filter A. Drainage geotextile shall consist of geosynthetic specifically manufactured for use as a preamble soil filter that retains soil while still allowing water to pass throughout the life of the structure. The type and placement of the geotextile filter material shall be as required by the Wall Design Engineer in their final wall plans and specifications. PART 3: DESIGN PARAMETERS 3.01 Soil A. Onsite soils (silty clay with no organics)to be used as retained soil, foundation soil,and reinforced soil. Foundation soil and reinforced soil shall be proof-rolled and compacted to 95%standard Proctor density and inspected by the Owner's Geotechnical Engineer prior to placement of leveling pad materials. B. Should the actual soil conditions observed during construction differ from those assumed for the design, design shall be reviewed by the Wall Design Engineer at the Owner's Geotechnical Engineer's direction. 5