Laserfiche WebLink
should be kept at least 5 feet above the bottom 3f the steel using during concrete pouring <br />operations. <br />The static water able has not been encountered at depths less than 100 feet in this area. Water <br />may be encountered within the fill or granular pockets in the glacial till. The water may <br />contribute to local sloughing of the wall of the caisson hole, but is not expected to require <br />significant dewaaring effort. <br />Caisson installation should be monitored and the hole should be inspected and approved before <br />concrete is pound. For holes that are not drilled with mud, the bottom of the holes should be <br />baod cleaned to remove cuttings. Air quality should be tested prior to personnel entrance. Steel <br />casings should be used for protection. If mud is used to keep the hob open, special procedures <br />should be developed by the contractor to ensure that cutting rare adequately removed from the <br />hole. These procedures for ensuring a clean bearing stratum should be approved by Dames It <br />Moore. <br />Quality control is critical to the proposed deep foundation. The random fill may create <br />unknown difficulties in taLeon inatallation. Long caissons in fill are particularly susceptible to <br />caving and it will be difficult to maintain verticality (plumbnea). it is essential that the <br />construction be monitored by Dames & Moore geotechnical engineering personnel. <br />5.3 PILE FOUNDATION <br />5.3.1 Vertical G mci iaa And Settlement <br />Fourteen -inch steel H piles an also recommended for the support of the building. Such piles <br />will derive their downward capacity primarily from end bearing in the natural glacial till or <br />outwash soils. A medium to heavy section such as 14HP102 is recommended. The piles should <br />be driven through the fill into the natural glacial soils and to a sate of *Practical refusal.• <br />a-005.00695-016%88060?00.np <br />00695.509.016 12 <br />