2222 LOWER NORTON AVE 2018-01-01 MF Import

� ,: in-sihi stress, and loosening of supporting soils around the pile, a flight auger with a pitr,h equal to about one-half the outside auger diameter should be used. � D Pile grouting should begin by withdrawing the auger approximately 12 inches from the bottom of the hole and lo�vering the auger to the original depth as grout is pumped. The purpose of this I� process is to densit; loose soil at the tip of the pile. Concrete grout should be pumped continuously during withdrawal of the auger, at a rate not !' exceeding about 7 to 9 feet per minute. During withdrawal of the auger, sufiicient grout should be pumped in the auger to maintain a grout head of at ]east 7 feet above ground level. The ia volume of grout placed should be at least 10 percent greater than the theoretical augercast pile volume. ifi i� To avoid pile disturbance, augercast piles should be allowed a minimum 12-hour set period before installing adjacent piles closer than about 8 feet. Steel reinforcement consisting of at least one center bar should be place3 along the entire length of augercast piles. A spacer placed at the bottom of the center reinforcing bar should be used to position the steel and to verify that minimum augercast pile diameter is achieved. ,, As outlined in the next section, we recommend that Dames & Moore be retained to provide � monitoring and grout testing services during construction of augercast piles. �, 7.0 CONSTRUCTION MONITORING AND TESTING i We recommend that Dames & Moore be retained to provide construction monitoring and tesring i;, services during pile construction. The purpose of this monitoring would be to confirm that �: subsurface conditi�ns arc as anticipated, provide field recommendatioi;s as required based on conditions encountered, document the activities of the contractor, and assess his compliance wiffi ;. •a the project specifications and recommendations in this report. Prior to pile installation, Dames ; & Moore should have an opportuniry to review and comment on ihe contractor's planned procedu.res and equipment for installation of piles. We recommend that ane of our geotechnical I. engineers or an experienced engineering technician be involved, on a full- or part-time basis, i to monitor the construction of the piles and obtain pile grout samples for subsequent laboratory compressive strength testing. I � . 8.0 CLOSURE � The analyses, conclusions and recommendations contained in this report are based on site � conditions as they presently exist and assume that the explorations are representative of the subsurface conditions across die study area. We have further assumed that the subsurface � conditions averywhere are not significantly different from those disclosed by the investigation. �' If, during any fucure construction, subsurface conditions different from those encountered in the explorations are observed or appear to be present beneath excavations, we should be advised at ; 503289-01.01 January 19, 1995 nnrics 6. Mooizi.