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I.03 Backtilt Gnginecrine Criteria <br />The following engineering ctitc:ria tix SCB hackfill have been established to ensure effective <br />performance of the desiv_ned vertical barrier wall. The follo~F'in~~ criteria we~~ used in <br />eraluatine the mix desiens for the backtiil: <br />Backtill ( Slump ~ Wrt Density Specified Unconfined <br />I Permeability ~ Compressive S[renedi <br />SCB E 5 to 7 inches F l5 pcfzslurry E s5.0 x lU" cmisec 30-160 psi <br />~ i (28 day cure time) (23 day cure time) <br />Haley 3c Aldrich determined the demonstration backtilt mix design based on previous design <br />and construction experience with vertical barrier walls involving similar engineering criteria. <br />. 4:d1 ('iti: 3i. 1rUet k'h _-?I-'~xti Ui ~... --.~.: u- -,-a*~.rv..~ \ '.f; i+iR i'.a. i <br />