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

Arcas to bc dccclopcd or graded should be cleared of surtacc and subsnrface dcleterious mauer including any debris and grass (north henn). Graded arcas should be stripped of organic soils. Organic soils are likcly u�ly associatcd with lhe existing nonii benn. [xisting soil stockpiles sltottld be removed from Ihe site or incorporated into site erading if suitable. The organic suils can be siockp�led and used latcr for landscaping purposes or may be spread ovcr landscapc arc:is follo�ving complction of grading. If spread out, thc organic strippings should bc in a ' iaycr Icss that I faot Ihick, �hould nut bc placcd on slopcs grcatcr than 3H:1 V and sliould bc tr�ck-rollcd � to a uniformly compactcd conditioa �tatcrials that cannot bc uscd ior lar.dscaping or proicction of disuubed arcas shoulJ bc rcmoved�rom dre projec� site. All watcr should bc pumped &om the cxisting tcmporary dctention ponds We rccommend tliat all loosc, so('t, and/or wet soil in thc temporary detcntion ponds be removrd tn c�cpnse snitablc medium dcnsc to Jcnsc soils prior to filling aiih .=.trucuir;�I iill. Subgrade Prepaiation In existing fill are;�s, �vc recommend di:u ihc upper 12 inches of�he building and pavement subgrade areas be n:worke�l and recontpacted to at Ieast 9� pereent �1DU in accordance with the ASTb( D ;5�7 test proceduro (modilicct Proctorl. Pcior to placing new fills, pavcmcnt basc coursc tnatcrials or gravcl bclow on-gradc Iloor slabs, subgradc arcas in nativc soil arcas shoidd bc prooGolled to lacatc :�ny soR or pumping soils. Prior lo proo�rolling, all unsuitablc soils should bc removcd Gom bclow building and paveinent areas. Proofrolling can be completed using a piecc of hcaay tire-mounted equiprnent �uch as a loadcd dump tnrek. lf thc subgradc soils ;uc loosc or wct such tha[ the compaction critcri� can not bc � accumplished, thcn the unsuitabl:�soils shuuld be removcd to compe�ent soils anJ replaced with structural fill. Uuring wc[ wcathcr, the exposed subgrade areas :,hould bc probed to determine dic extent of suft su=.ls. ff soll or putnping soils are obscrve�, thcy should bc removed and replaced with suuctural fill. � If dcep pockets of soft or pumping soils are encountered outside the building arca, it may be possible ro limi[ Uic deplh of' overcxcavation by placing a non-wuvcn gcotextile fabric sucli as tilirafi 500)C (or � simil;�r matcrial) on thc ovcrcxcavatcd subgradc prior to plucing strucun'al fill. Thc gco[ex!ilc �.vill providc additional support by bridging ovcr thc soll matcrial and �sill htlp rcducc fincs contamination into the stnictural fiil. Wc recommend that esisting trench backtill for utililics at lhe site be evaluared and recompacted if necded, cspccially if thc utility is luc�ted under future pavcment arcas. At this time, wc recammend that all b�icktill above tlte cratvn of the pipe be remuved aud recontpacted b:ised on the extensive setdement I ohscrved in thc cxisting stonn drainpipe trench bacllill locared in the norlheast area of the sitc. If thc work is perfomicd during wct we:�thcr cunditions, it mny not bc pussiblc to rccompact ihc subgradc to 'i� percent of Ihe bIDD. In this casu, we recommend thal the suber;�dc bc con�pacted �o tl�e extent possiblc without causing unduc wcuving or pumping ol thc subgradc soils. Suborade disturbancc or deteriora:ion could occur if the subgrade is �vet and can no[ be dricd. If thc subgrade dcterior;ucs durin� prou(rulling or compaction, it may becomc nccessary ro modily thc proofrolling nr cumpactiun critcria or r.uthods. Working Pad If cunsWctiun uf �he building oceurs during the wet weadicr months, generally Octobr.r lhrough �lay, i�nning ofcquipmcnt on :hc glacial subgradc ;oils �vill bc dilficult and Hu subgradc �vill likcly bccome Fi(r.Vo.L'0!e'�in�.qn PaA�� GEOENGINEEPS� Junuery?S.:UO.i