11825 AIRPORT RD 2016-01-01 MF Import

I �rz�. ��e � Northern, mc. � Project No.29E-801 Footing widtlu should compiy with applicable building codes. All penmeter footinga ' should be at last eighteen(18) inches below the final extaior grade for frost protection. Prior W footing ptacement, any wR, loose or wa uas encountercd in the footi� r_ areas should be removed and replaced with stnictural 611, angular uushed rock,contrmUed densiry fill(CDFylean mix conccete or additional footing cone�ete. The crushed rocic or atructural Sil sGould be plaud in uniform liRs and n�echaaically compacted between GRs. ' ( We recommead that we be engaged to verify excavation to witabie beazing susta prior W foundation placement and w observe placement and compaction of the bac�IL , � Following is a discussion of two(2)opaons for placement of the proposed building I foundation aad slab-on-grade. Sdection of the chosen option wiil be based on costs u►d ease of consuuctioa In addidon, Optioa II as prasented below iavolva consideration by t4e �_ ow�r whethu to accept some risk of setdement in stab areas. 63.1 Option I � We rccommend that the uncontrolled fill and loose soil be excavated from the ( proposed building and siab azeas to a wbgade consisting of the on-site native,brovm sandy L gravet(GP)that is dense. The excavations shouid extend a minimum of four(4)fat beyond the outside edge of the proposed footings. CWe raommend that this subgrade be compacted with a vibratory plate compactor W a firm and unyiddi g state.The entire building foundatioa and slab azea should then be braight ' � up m slab subgraae elevation wiffi propaly placed and compacted stcuctural fill. We recommend footing trenches should then be excavated within the compacted stcuctural fill to t6e minimum frost protection depth(18 inches beloasthe acterior finished grade). l63.2 Option II � We rccommend excavating footing uenchas through the on-site u�ontrolled fill to t6e native bearing wit described above. The buiiding's footings may then be placed directly on I bearing soil. Altanatively, CDF/lean mix concrate,structural fill or compacted cnuhed rodc j � may be placed on the bearing soil and the footinas may then be placed on the structurat SU. tn case of CDF/lran mix concrete,the footing trmch should extend a minimum of one � (1)foot on either side of the proposed footiqgs. If you dect to use suuctura1811 or ccushed rock option,then the footing trenches should extend a aunimum of four(4)feet on both sida . of the proposed spread footings. ' � This option includes placement of buiiding siabs on the adsting uncoiarolled 6t1. We � recommend that this in-situ uncootrolled fili be over excavated at least two(2)fat below the slab subgrade elevation. The exposed subgrade should then be proofrolled and mechanically compacted prior to placing structural fill ¢onsisting of ccushed eock to slab subgade � elevation. , ! S � -