1315 PACIFIC AVE 2018-01-01 MF Import

stopped to detertninc thc cause of thc movement and to establish thc type and extent of rcmedial measurcs rcquired. TEMPORARY DEWATERING Perched groundw�ater was obscrved between about 12 and 23 feet below the ezisting ground surface. The static groundwater level is located below the planned base of the excavation, based on the boring data, site location,and thc naWrc of the soils at the sire. For planning pu�oses, we mcommend the contractor plan to use sumps and pumps located within the excavation for iemporary dew�atering. IC nccessary, a 6- to 12-inch-thick granular working pad consisting of crushed rock, quarry spalls, or the contractor's preferred material can be ased if groundwater/stortnwater needs to be managcd throughout the interior oC the site. SHALLOW FOUNDATIONS We recommend that convcntional sprcad footings be a minimum oC 36 inches wide and that continuous wall footings bc a minimwn of 18 inchcs widc. Extcrior footings should be foundcd a minimum of I8 inches bclow thc lowcst adjaccnt gradc. Intcrior footings should be founded a minimum of 12 inches bclow top otslab. Shallow sprcad footings may be foundcd on structural fill, glacially consolidated soils, or on a layer af crushed rock overlying thesc soils. A higher bearing pressurc can be achieved whcrc footings are founded on densc to vcry dcnsc outwash, glacial till, or on crushed rock ovttlyins these soils. Recommcnded bcaring pressures (or varying sitc conditions arc presented bclow. We expect that a portion of thc footings will necd to extcnd through exis[ing fill ro comperent glacial soils or be founded on slructural fill (particularly in thc central site arca whcrc the approximate 20-foot deep sewer pipe is located). Irootings bcaring on swcwral fill soils (fill placed or compacted in place to the minimwn standard) may bc proportioncd using an allowablc bcaring valuc of 4,000 psf. Whcre foundcd on undisturbcd mcdium dense to dense outwash dcposits (typically cncountered at Elevation 107 fect), sprcad footings may be proportioned using an allowable bcaring valuc of 6,000 psf. Deep (ootings founded mi undisturbcd glacial till (anticipatcd below Elcvation 100 to 103 fcet) may be proportioned using an allowable bearing �•aluc of 10,(N10 psC All existing fill must bc rcmoved from bclow planned foundalions. EsBmaMd Settlement Wc cstimare that thc sctticmcnt of continuous strip and isolatcd coiumn footings will be on thc ordcr of '/s to '/. inchcs. Thc scldements should occur rapidly after applying load to the footings due to the granular nature of the bearing soils. Wc estimate differcntial scnlcmcnt between comparably loadcd footings foundcd on similar soil will bc on thc ordcr of onc-half thc lotal scnlemcnt. Additional ditTercntial settlement may occur betwecn footings supporiing diffcrcnt loads or between footings undcrlain by dilTcrcnt subgradc soils. Thc allowablc bcaring valucs prescntcd above apply to the total of dcad and long-tcrtn live loads cxclusi��c of Ihc wcight of the footing and any ovedying backfill. An increase in thcse values of one-third may bc uscd whcn coiuidcring�aind or scismic loading. Flk�n. l?u:-nnl-on Pogc 10 G[OENc�N[El�s� lunr/._'00.1' �y