1415 75TH ST SW BASE FILE 2016-01-01 MF Import

0'Donnell, Drigham 6 Partners, N. W. E-1540 May 19, 1901 Page 10 slopes or loads Will occur above the walls. llowever, if sur- charges arc to be applied they sliould be added to ttie above lateral pressures for design. All walls sl�ould be provided witli adequate provisions for subsurEace drainage to prevent the buildup of hydrostatic pressures eitlier behind or b�•neatli tlie walls. All sucli drains sliould be tiylitlined to a positive, permanent diccharge system. Retcntion Pond Defore earthwork or site clearing operations get under way it will be necessary to remove, or relocate, the stormwater retention pond presently located in the northeast corner of the west site. At tliis time alternative metliods for collecting or controlling stormwater runotf from tlie adjacent site must be inplement^.d. We recommend that the utmost care be exercised during removal of the retention pond to make certain that all soft and/or wet sedimenl-s retained within the pond area are removed. Site Preparation ` All building and pavement areas sl�ould be cleared oE all existinq structures, utility lines, pavements and debris, large vegetation, buslies, topsoil and otlier deleterious matter. All topsoil stripped from tlie site may be stockpiled for later use in landscaping, iE desired, or it should be removed from the aite. Topsoil material3 sliould not under any circumstances be allowed to contaminake materials tliat are to be used as'struc- tural fill. � In all areas that will receive fill, bUildings, or pave- ments, tlie subgrade shoul.d be prooErolled under the observation of a representative oE Eartli Consultants. Inc.' This procedure should indicate tlie presence oE any exceptionally loose or un- ,table areas which, 1E present, should be overexcavated and replaced by structural fill or cruslied rock. Cills placed on sloping surfaces must be benched into the underlying subgrade and the toe of all fills should be firmly keyed into the dense native soils. To provide a stable slope for tlie deep Eill along tfie edge of the swamp on the western site it will be necessary to key the structural Eill firmly into tlie dense native till soils under- lyinc the site. To accomplisli tliis it will be necessary to remove tlie existing organic materials overlying the part of tlie site in the cwamp area on which the ti.11 slope is to be con- ' structed. Removal of the organic materials may be achieved by G��Ih Consullanls, Inc.