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i' <br /> W. T. Duryea Company JN 87105 <br /> May 20, 1987 Page 5 <br /> SITE DRAINAGE <br /> We recommend the use of footin5 drains at the base of all <br />' footings and earth retaining walls . Roof and surface watet <br />� drains must be kept separate fxom thc foundation drain system. <br /> The footing drains should be surrounda�d by at least six inches <br /> of one-inch-minus washed rock . The roc:k should be wrapped with <br /> non-woven geotextile filter fabric (Alirafi 146N, Supac, or <br /> similar matetials) . At the highest point, the perforated pipe <br /> invezt should be at least as low as the bottom of the footing <br /> and/or crawl space and it should be sloped foz drainage. <br /> The excavation and site should be graded so that surface <br /> water is directed off the site and away from the tops of slopes . <br /> Watez should not be allowed to stand ir: any area where <br /> buildings, slabs, or pavements are to be constructed. During <br /> constzuction , loose suzfaces should be sealed at night by com- <br /> pacting the surface soils to reduce the infiltration of rain <br /> into the soils . The slopes should be covered with plastic . <br /> EXCAVATIONS AND SLOPES <br /> In no case should excavation slo'pes be steeper or greater <br /> than the limits specified in local , state, and national <br /> government safety regulations. Temporary cuts greater than four <br /> (4) feet in height should have an inclination no steeper than <br /> 0.5: 1 (horizontal :vertical) in the glacial till soils . <br /> All pezmanent cut slopes into native dense soils should be <br /> inclined no steeper than 1.5: 1 (horizontal :vertical) . Fill <br /> slopes should not exceed 2:1 (horizontal :vertical) . Watez <br /> should not be allowed to flow' uncontrolled over the top of any <br /> • slope. Also, all permanently exposed slopes should be seeded <br /> with an appropriate species of vegetation to reduce ezosion and <br /> improve stability of the surficial layer of soil. <br /> PAVEMENT AREAS <br /> All parking and roadway areas may be supported on native <br /> soils or existing fills provided these soils can be compacted to <br /> 95 percent density and are stable at the time of construction. <br /> Grading of the front area of the site could expose topsoil or <br /> remove most of the fill over the topsoil . Proof-rolling the <br /> pasking area with a loaded dump truck is recommended to locate <br /> any soft areas . The subyrade should be evaluated by Geotech <br /> Consultants, Inc . after the site is stripped and cut to grade. <br /> '; <br /> GGOTECH CO\SUL'CAN"PS INC. +, <br />