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� — - — --- -- _- <br /> r. <br /> I <br />, DAVID L. �ELSON AND ASSOCIATES, INC. <br /> � Consulting Engincering Geology <br /> �^ May 37 , 1991 <br /> ' ^�'�� Project No. 4791 <br /> r <br /> �� <br /> �� ��,F, Page 7 <br /> `r. °�S :� '` <br /> � CQNCf.UDING OPINIONS <br /> ;.,` �.. � General <br /> ' In qeneral, we conclude that the site sliould be ccmpa*ible with the proposed <br /> ��` residential duplex development. From a geotechnical standpoint, the area <br /> �;.,_ � � appears relatively stable, and is capable of supporting the planned <br />� I development. We recommend that project design and site preparation take into <br /> 4 ly account the sloping character of portions of the site. The basal glacial till <br /> � and outwash soils are generally considered suitable for "conventional" <br /> � "' development and construction as discussed herein, whe:e earthwork, foundation <br /> �' �, . � <br /> �! e';{:'.:_ olacement and drainage control are normally performed. Specific geotechnical <br /> ' •. ,;:,,°.:.. <br /> �'�`��F,�:• � N evaluation and recommendations, other than those discussed herein, are not <br /> {�f,i I <br /> !`�,`��°��� II anticipated. <br /> �'.��i,,,;;, �. <br /> �;r ;-,'.�.r��. <br /> i�+;,:.T : - � � <br /> `,-'�' � �� I „ Excavation Considerations <br /> , .,t: ,, <br /> , ,�}� At this time we are not aware of extensive cuts for this project. However, if <br /> ti , y5� � � a basement level is planned below the parking level, some excavation may be <br /> �.i:`�v,� �,. .. '�. � 1 <br /> + necessary to accommodate foundations and floors. Also, the sloping character <br /> , � + of the ground and proposed finished floor elevations may result in earth cuts <br /> �. <br /> � ' and "ste ed" t <br /> pp ype foundations along downslope building lines. <br /> I � <br /> - I ^ Stability of open excavation cuts within the sloping portions of the site <br /> during construction will depend on the nature and consistenc}� of the naturally <br /> - � f. � � <br /> � � eccurring soils, as well as the presence of ground water seepage and runoff. <br /> The following temporary cut slopes are expected to be appropriate for their <br /> I <br /> respective soil types: <br /> t � <br /> -2H to 1V for loose surficial soils. <br /> ! -1H to 1V � for medium dense weatherec qlacial till and/or outwash. <br /> � ' -0.75H to 1V for dense glacial till with cut heights up to 8 feet. <br /> � Ample slope protection and mairi:enance should be used durinq construction. <br />, t � Because of the many variables involved, the above values should be considered <br />' � general guidelines. Unsupported permaneit cut slopes in dense native or <br /> �.w compacted structural fill soils should be no steeper than 2H to 1V. <br /> � � <br /> I <br />