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• ~ <br />TABLE D.6-2 • <br /> ESTIMATED <br /> PERCENT ESTIMATED <br />MATERIAL USCS TOTAL PERMEABILITY CONSTRUCTION <br />DESCRIPTION DESIGNATION VOLUME cm/s USE DESIGNATION <br />Sandy-gravels GP/SP 28% 10-z x 10-4 (1) Pervious fill materials Type 1 <br /> - drainage blankets <br /> - finger drains <br /> (2) Embankment fill <br />Poorly graded SP/GM 22X 10-3 x 10-s (1) Pervious fill Type 2 <br />sands SP/SM (2) Filter materials <br /> (3) Embankment fill <br />Clayey-silty sands SM/SC 509e 10-4 x 10-~ (1) Semi-pervious fill Type 3 <br /> (2) Liner bedding <br /> (3) Embankment fill <br />Note: All of these soils classify as Type 4 material. <br />