2305 100TH ST SE 2018-01-02 MF Import

� I w-ayau-ut � � � � „ AUn: D1r. 7'ony �'ivolo, P.G , b ]une 16, 19RR ,o � Page 5 i Q M l '! y � �yp7 � � N H I � � � 200 mesh sieve)of imponed sa�d and Fra��el should be limited to 5 percent, rn less. In i I � � addition,any fines should be non-plastic. (Refer io�Vet Weather Eanhwork.) ; � i� • I � w Thc sprcifications for drainage sand and gravcl are presentcd on F'igure 11. i y y Wet We•alher Eanhu�ork � � y I „ Most of the soils at the site contnin su(ficiem quantitics of silt and clay to pioduce a cohesive mixmtt when wet. Such soils may become muddy and difficult or imposs�bic ro place and � � compact if their moismre content significantly exceeds the optimum. 7he following ttcommendatiut�s arc applicable if eanhwork is co be accomplished in wet weathcr or in wet conditions: e. Eanhw�ork should be accomplished i� small srctions to minimize exposure to wet weathec Excavaiion or the removal o(unsuicable soil should bc followed immr dia�clp by the placement of mncrete or comp�ction o(a suitabk thickness(generally 8 inchcs ur more)of clean swctural fill. The size of conswction equipment may have to be limited to prevent soil diswrbance. In some instances,it may be oecessary to excavate soils with a backhoe,Gradall, or equi�•alent to minimize subgrade disturbance caused hy equipment vaffic. b. Fill material should consist of clean,granular soil,of W hicn not more thac 5 percent by dry weight passes the No. 200 mesh sieve,based or, wct sicving the fraction passing thc 3,�4- �� inch sie��e. The fines should be non•plastic. � c. The groun�l surFace in the conswction area should be sloped to promote the rapi ru�- �, off of precipitation and to prevent ponding of w'atcr � �_ �� d. No soil should be left uncompacted and exposed to moisturc. A smooth•drum vibratory roller,or equivalc��,, should be used io seal the ground surface. e. £xcavation end placement of swctural fill material should tx observed on a full•time , 1 � ( basis by a Georechnical engineer cxperienced in e�nhwork,to detertnine ihat all work is being '� accomplished in accordance w�th the project specificadons. The above recommendations for wei v.eather eanhti'ork should he incorporated into the convact spccifications. Test Pit Backfill ' � t� The test pits excavated during this smdy were backfilled hy rcplacing the soil in 2- to 3-foo� lifts,tamp�nF with the backhcx bucket, and rolling the res�ored surface M�th the wheels of the backhce. We do not consider that such compactive effon is suitable if the pits are Ixated beneath the nng footing or bottoin plate of the rcservoir. �+'e recommend that the backfill nf �-+1 pits Ixated inside the tank area be acavaied and suitably rccompac�ed,or filled with concTcie. ` r Pl�nc Re��ieN '+�1 Conctruction T1�nitnrine We recommend that we be retained to revicw those ��nions of the plans and specifications th:u penain to earthwork, dtainage,and foundations to detemiine if thcy are consistent with our SHANNOn 6 \YILSON INC