4935 GLENWOOD AVE 2016-01-01 MF Import

Jordan Construction JN 00284 July 25, 2000 Page 7 soils is Type C and should not be excavated greater than a 1.5:1 (H:V) slope extending continuously between the top and the bottom of the cut. The above-recommended temporary slope inclinations are based on what has been successful at other sites with similar soil conditions. Temporary cuts are those that will remain unsupported for a relatively short duration to allow for the construction of foundations, retaining walls, or utilities. Temporary cut slopes should be protected with plastic sheeting during wet weather. The cut slopes should also be backfilled or retained as soon as possible to reduce the potential for instability. Please note that sand and loose soil can cave suddenly and without warning. Excavation, foundation, and utility contractors should be made especially aware of this potential danger. All permanent cuts into native soil should be inclined no steeper than 2:1 (H:V). Any disturbance to the existing slope outside of the building limits may reduce the stability of the slope. Damage to the existing vegetation and ground should be minimized, and any disturbed areas should be revegetated as soon as possible. Soil from the excavation should not be placed on the slope, and this may require the off-site disposal of any surplus soil. DRA/NAGE CONS/DERAT/ONS We recommend the use of footing drains at the base of all footings and earth-retaining walls. These drains should be surrounded by at least 6 inches of 1-inch-minus, washed rock and then wrapped in non-woven, geotextile filter fabric (Mirafi 140N, Supac 4NP, or similar material). At its highest point, a perforated pipe invert should be at least 6 inches below the bottom of a slab floor or the level of a crawl space, and it should be sloped for drainage. Drainage should also be provided inside the footprint of a structure, where a crawl space will slope or be lower than the surrounding ground surface or an excavation for a building will be close to the expected high groundwater elevations. We can provide recommendations for interior drains, should they become necessary, during excavation and foundation construction. All roof and surtace water drains must be kept separate from the foundation drain system. A typical drain detail is attached to this report as Plate 4. For the best long-term pertormance, pertorated PVC pipe is recommended for all subsurtace drains. No groundwater was observed during our fieldwork. If seepage is encountered in an excavation, it should be drained from the site by directing it through drainage ditches, perforated pipe, or French drains, or by pumping it from sumps interconnected by shallow connector trenches at the bottom of the excavation. GENERAL EARTHWORK AND STRUCTURAL FILL All building and pavement areas should be stripped of surtace vegetation, topsoil, organic soil, and other deleterious material. It is very important that existing foundations, septic systems, and pertaining drain fields be removed before site development. The stripped or removed materials should n�t be mixed with any materials to be used as structural fill, but they could be used in non- structural areas, such as landscape beds. GEOTECH CONSULTANTS, INC. �5