1505 INDUSTRY ST Geotech Report 2018-01-02 MF Import

r:sponsible for maintaining the integriry of the vapor barricr during construction. It may also be prudent to apply a scaler ro tlie slab to funher returd thc migration of moisture through the Flooc The strucwral engincer should bc consultcd for rceommendations 1br curing of wnaete slabs. PAVEM[NT SUBGRADE PREPARATION Nc recmnmcnd th�t thc subgrade soils in ncw pavcment arws bc prepured and evaluateJ as dcscribcd in Cic �arih�vork scction of this report. Thc upper 2 fect of all parking and acccss' drive pavcment subgradc ;ircas sl�ould be cumpactcd wiih a large ;teel drum roller to at Ieast 9+ perccnt �1llD per e\STN[ D 1557. Wc also rccammend lhat thc prepared subgrade be proofrolled thoroughly prior to paving to lacaic any solt or pumpiog soils. If the subgrade soils are loase or soft, i[may be necessary ro excav.�te the soils and replace them with stnictur:d fil1, gravcl borrow, or grevel t�ase materiaL Pavemcnt subgrade conditians I�uuld be observed and proof-rolled during constniction ro evaluate the presence of unsu;table subgrade �,il; and the necd f'ur ovcrexcavation and placement of a geotextilc fabric. �Ve rcconmiend that ihc ubgrade areas be preparcd ancl paved during the dry scason as�he glacial till soils will be very diffictdt ro ��nipac[and rou�c equipment un in the wet weathe.manths. I hc wnhactor should be prepared tu protcct acccss routes for cyuipmcnt with ATB or a ihick section ol' cn�shed gravcl or recycicd asphalt or concrcte during the �vinter. Tire subgradc soils will becomc dizturbed and hcavily nuted under equipmcnt loads in the winter if anprotected. DRAINAGE CONSIDERATIONS We anticipate shallow perched groundtvatcr secpage may cnter excava[ions depending on thc time of year construction lakes place,cspecially in the winter months. F(owever, ��c expect that this seepage water can bc handlcd by digging interccptor trenchcs in the cxcavations- and pumping from sumps. The scepaee watcr if not intcrrcptcct and removed from dic cxcavatiuns a�ill makc it difticult to placc and compact stnictural fill and may dcsr.ibilize cut slopcs. :�II p�rved and landscaped arcas should be gradec! so that surface drainage is direcred away from thc I building to appropriatc catch basins. Ruof duwnspouts should not discharge into the perCorateel pipes intended for providing wall drainage or iu li�c footing dmin lincs. '.;f'_COMMENDED ADDITIONAL GEOTECHNICAI SERVICES I�roughout this report, recommendations are provided �shere �cc consider additional geotechnical ;�ices to be appropriata These additional services:�re summarizcd below: • GcoEngi��cers should be retained to rcview the project plans and specitications wl.en comple!e to confin'n that our design recon:mcndations have becn impL.mentcd as intended. • During construction, GeoEngineers should observe tcmporary cut slopes, evaluate the suitability of thc fowidation and retaining�c�ll subgradcs', evaluatc thc suitability of tlour slab and pa��cmcnt subgradas, ob,erve installation oC subsurf'ace drainage mcasures, ob,erve and t��st structural backfill, ancl provide a summary Icttcr uf our conswction obscrvation scrvices. The purpuses oP Gco[:nginecrs construction phasc scrviccs arc to confimi that tL•c sub�urfacc condi�ions arc runsistent wiH� thuse anticiputed at Ihc sit� aml othcr rcu�on, describeJ in Appencix C, Repo�t I imitations anJ Guidclincs fur Use. l�l:. ,��„ ::��l:f-r,nl-wi __.___ —_—._—_�—A�' 1� CsEOENGINECl13�' hinuerc'<, 'i�ria