2222 EVERETT AVE 2016-01-01 MF Import

Augercast piles may be used for foundation support to transfer building loads through loose fill soil into the underlying very stiff glaciolacustrine sediments. Because of the variable nature of the subsurface soils, it is inappropriate to give exact pile lengths. All pilcs should penetratc a minimum of 5 feet into the very stiff glaciolacustrine sediments and be a minimum of 15 feet in length. The followir,g table presents spccific design recommendations for both 12- and 16- inch-diameter piles. Allowable Lateral � �Ulowable Allowable Uplift Load for 1 Inch Depth of Pile Diameter Vertical Capacity Capacity Detlection' Fixity (inches) (tons) (toas) (tons) (fect) 12 20 7 :i 12 16 30 10 7 l2 ' Allowable latcral loads assume a fixcd-hcad condition secured by thc pilc cap/grade beam systcm and that pilcs are suiiably reintorecd, and a minimum ccntcr-to-ccntcr spacing o(8 pilc diamctcrs. The allowable vertical loa�s may be increased by one-third for short-rerm wind or scismic loading. Anticipated setticments of augercast pile-supported structures will generally be on the order of one-half inch. Similar setdement performance is predicted for conventional foundations founded on eithcr very stiff silts or structural fifl. ` Pile Inspections The actual total lengd� of each pile may be adjusted in the field based on reyuired capacity and conditions encountered during drilling. Since completion of the pile takes place below grouud, the judgment and experience of the geotechnical engineer or his field representative mus[ bc used as a basis for determining the required penetration and acceptabiliry of each pile. Consequendy, use of the presented pile capacities in the design requires that all piles be observed by a qualified geotechnical engineer or engineering geologist from our firm who can interpret and collect the installation data and examine die contractors operations. AES[, acting as the owner's field representative, would deterniine the required lengths of the piles and keep records of pertinent installation data. A final summary report would then be distributcd, following compl�tion of pilc installation. PROJECT DESIGN AYD CONSTRUCTION MOMTORING At the time of this report, sire grading, structural plans, and construction methods have not been finalized and the recommendations presented herein are prefiminary. We are available to provide additional geo[eclmical consultation as the project design develops and possibly changes from that upon which d�is addendum report is based. We recommend that AESI � 4 `-�'