902 WESTMINSTER CIR 2016-01-01 MF Import

CASCApE GEOTECHNICAL INC. August 6, 1992 Job No. 9207-0SG 'S�eve Size Percent Passine .. 4 nch 1� 114 25-75 p2pp 5.0 m�imum. Based � on fraction passing �4 � sieve „� Wall backfill should be placed in twelve (12) inch maximum loose lifts, and should be � � mechanicslly compacted where it wi11 suppoR structural loads ta at least ninety-five (95%) ,., percent of the laborarory determine�, ASTM D-1557 maximum dry densiry value. We � recommend using lightweight, hand operated equipment when compacting within four (4) fcet �-. of the walls. — A continuous drain should be placed along the interior, perimeter tce of all basemendretaining � � walis and should be tightlined to a suitable drainage outlet. The drain may consist of a six (6) - inch diameter, perforated, rigid pipe that is bedded in and backfilled with at least eighteen (18) � - inches of pea gravel (diameters greater than the perforated holes.) 1'he native soils consist primarily of silty sands. It is unlikely this material will be suitable for use in retaining wall bac�ll; however, a sieve analysis would provide conclusive evidence if i, you desire to use on site materials. Ouce the preliminary plans are drafted, we should be retained by the designer to provide lateral forces induced by the soils on retaining walls. These latetal earth pressures vary with depth and backfill configucation, and can only be calculated atter the designer has detailed there location and elevation. , 7