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� <br />�' <br />� <br />� <br />� <br />� <br />� <br />� <br />CASCADE GEOTECHNICAL <br />March 27, 1991 <br />The December Partnership <br />Job Dfo. 9102-18G <br />Page 7 <br />(7) fPet may bo safely loaded to twenty (20) tons per pile. We <br />reco,nmend a minimum grout sti•enqth of 3000 pai to ensure pile <br />quality. All pileB should contain steel reinforcinq and be spaced <br />as par tha structural enqineer. The installation of the piles <br />should ba observed by our representative to confirm that adequate <br />penetration is achieved. <br />The presence of peat will require that special ca�e be taken during <br />the placement of the auqer cast piles. The pile inatallation <br />sequence should also be arranged so that each pile obtains <br />sufficient initial set before any adjacent piles are installed. <br />The auger cast pile and grad� beam foundation should be deaiqned by <br />your structural engineer. The pile spacinq and reinforcement and <br />attachment to the grade beam should be provided on your plans. We <br />should be engaged to review the plans prior to construction to <br />verify that our recommendations have been properly interpreted. <br />81ab-on-cirada Floor <br />We understand from the plans provided to us and from conversationa <br />with you that the garaqes for the proposed houses will have slab- <br />on-grade floors. Due to the presence of associated orqanic soils <br />and uncontrolled fill on site and the potential for contimied <br />differential settlement, wc. recommend that all slab-on-qrade floora <br />be designed as pile supported struciural slabs. <br />� If the soil is used for forminc,� the structural slab, a four (4) <br />inch layer of clean sand, pea gravel or crushed rock having less <br />than five (5) percent material passing the A�200 sieve, based on the <br />� fraction passinq the N4 sieve, should be placed below the slab as <br />a capillary break. <br />� <br />