5700 23RD DR W 2016-01-01 MF Import

1 � I beyond the location of the perimeter footings or roadway edge before sloping down at an angle j of 2H:1V, i ( The c�ntractor should note that any proposed fill soils must be evaluated by AESI prior to their � use in fills. This would require that we have a sample of the maurial 48 hours in advance to I perform a Proctor test and determine its field compacdon standard. Soils in which the amount of fine-grained material (smaller than No. 200 sieve) is greater than approximately S percent (measured on the minus No. 4 sieve size) should be considered moisture-scnsitive. Use of I moisture-sensidve soil in structural fills should be limited to favorable dry weather conditions. The near-surface, on-siu soils generally contained significant amounts of silt and are considered moisture-sensidve. In addiaion, construction equipcnent traversing the site when the soils are wet I can cause considenble disturbance. If fill is placed during wet weather or if proper compacdon cannot be obtained, a select import material consisting of a clean, free-draining gravel,and/or sand should be used. Free-drainine fill consiscs of non-organic soil with the amount of fine-grained ! material limited to 5 percent by weight when measured on the minus No. 4 sieve fraction. ► � 17.0 FOUNDATTONS ( Spread footings may be used for building support when founded on medium dense to very dense or hard natural soils, or structural fill placed as previously discussed. To limit differential settlemenu between footings wlvch bear on medium dense sands and those that bear on very dense � or hard glaciaily consolidatzd soils, we recommend that an allowable bearing pressure of 2,000 pounds per square foot (ps� be udlized for desigu purposes, including both dead and live loads. If higher bearing pressures aze needed, a value of 4,000 psf may be used in azeas where all � footinas aze placed enfre y on very dense tiit or advance outw�ch. A bearing pressure increase of one-third may be used for short-term wind or seismic loading. Perimeter footings should be buried at least 18 inches into the surrounding soil for frost protection. However, all footings must ( penetrate to the prescribed bearing stratum and no footing should be founded in or above loose, organic, or existing fill soils. All footings should have a minunum width of 16 inches. � It should be noted that the azea bounded by lines extending downward at 1H:1V from any footing must not intersect another footing or intersect a filled area wlrich has not been compacted to at least 95 percent of ASTM:D 1557. In addiaon, a 1.SH:1V line exunding down from any footing + must not daylight because sloughing or raveling may eventually underaune the footing. Thti,s, footings should not be placed neaz the edge of sr.�ps or cuu in the bearing soils. IAnticipated settlement of footings founded on medium dense to very dense or hard natural soils, or approved suuctural fill placed over these materials, shoutd be on the order of 1 i�h or less. � However, disturbed soil not removed from footing excavadons pnor to footing placement could result in increased settlements. All footing areas should be inspected by AESI prior to placing concrete. to verify that tha design bearing capacity of the soils has been attauxd and tl�at � consavcaon conforms with the recommendadons contained in this report. Such inspections may be required by the governing municipaliry. Perimeter footing drains should be provided as discussed under the section on Drainage Consideradons. � 16 1