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Land Venfures I,ltC <br /> Project 814-08095 land Ventures i,LLC <br /> November 19,2014 Aa1ed 814-08095 <br /> November i9,2014 <br /> Page 14 Page Li <br /> D.6. Pav�ments We recommend that the aggregate hase be compacted to a minimum of 200 pe►cent of fu maximum <br /> standard Proctor dry density.We reoommend that the 6ituminous pavement be compacted to at least 92 <br /> D.6.a. Subgrade Proof-Roll peroent of the meximum theoretical Rice density. <br /> Prior to placing aggregate base material,we recommend proof-ro1Rng pavement wbgrades to detcvmine <br /> if the subgrode materials are loose,soft ar weak,and In rieed of fuRher stabillzation,compactbn or wb- We r�etommend specffying toncrete for sldeuvalks,turb and gvtter and any other contrete pavemerKs <br /> excavallon and re-compaction or rcplacement. have a mfhimum 28-day compressive sirength of 3,900 psi.We also recnrnmend 7ype I tament meetlr� <br /> the requlrements of ASTM C 150.We recommend specifying 5 to 8 perc�nt entrelned air for exposed <br /> D.5.6. Design Settions concrete to provide resistance to iree:e-thaw deterioratbrt.We aiso rccommend using a water/oement <br /> Caboratory tests to determine an R-value for pavemerrt design were not included in the scope of this retio of 0.45 or less for concrete exposed to deiters. <br /> proJec�Based on a<lay subgrade,however,it is our opinbn ihat an R-value of 10 can be assumed for <br /> design purposes. D.6.d. Subgrade Draina�e <br /> We recommend tnstalling perforated dralnpipes througfiout pavement areas at low points and ebout <br /> Based upon the aforementioned traffic loads and an R�alue of 10,we remmmend a bituminous taYch basins.The drainptpes should be placed in small trenches extended at least 81nd�s below the <br /> pavement settion that indudes a minimum af 3 1/2 inches of bituminous pavemeflt(a 11/2-inch surface granular subbase layer—or aggregate 6ase material where no subbase 15 prcsent. <br /> course over a 2-inch base course)over S inches of aggregate base meterial and 24 inches of sand <br /> subbase. D.7. Utilltles <br /> The w�going per(ormante of bituminous pavements is impac[ed 6y conditions under which the <br /> pavement is asked to perForm In.These conditions Intlude the environmental conditions,the actual use �•7.a. Subgrade Sta6illzation <br /> canditions and the level of ongoing maintenance performed.Betause of normal thermo expansion and g�oa the resutts of the soil borings,the soils below the topsol)should be wltable fpr pipe wpport. <br /> comraction,tt Is not unusual to have cradcing develop within the first few years af plaament and for the \Ne antidpate that utdities can be installFd per manufacturer bedding requlremerits,If bplized soft <br /> aatking to�antlnue throughout the life of the pavement.A regular maintenance plan should 6e areas are encountered at pipe invert elevatlons,we retommend ptacing a stabillzing aggregate beneath <br /> developed for filling cracks to lessen the potentlal Impacts for coid weather distress due to frost heave or the pipe.The depth of the aggrcgate bedding wlll vary,however,a minimum of 6 inches and a maximum <br /> wartn weather distress due to wetting and softening of the subgrade.It is also nat unusual for the of 2 ftet is commonly used.This should be c�raluated tn the fteld at the time of installatlon.Some <br /> pavemerrt to requlre a seal coat within che flrst 5 to 10 years to indease the bng-term performance of groundwater may also seep into the utiliry trench excavations and should be removed from the <br /> the Wtuminous pavemeat. excavations wh11e instaAing and batkfilling the pipe. <br /> D.6.c. Materlals and Compactbn D.7.b. Selettion,Placement and Campaction of Badtftfl <br /> We recommend�eclfying crushed aggregate base meeting the requirements of Minnesota Departmem Wp�mmend selecting,placing and compacting utiCty backfilf In accordance wRh the <br /> of Transportation�MnDOT�Specificatfon 3138 ior qass 5 or s'anilar.We recammend that the bitumfnous �ommendatbns provided above in Sedlon D.I. <br /> wear and base oourses meet the requlrements of Specificatlons 2360,Type SP.We recommend the <br /> aggregate gradations for tt�e asphalt mixes meet Gtadation B for the base course and Gradation B ar A OJ.c. Corroslo�Potentlal <br /> for the surface course.Gradation A contafns a smaller aggregate size then Gradatlon B a�d will prov)de a The majority of the soils on this sFte are lean clay to sandy lean clay.These soils are potentially corroslve <br /> surface wfth less visible aqgregatewhkh is desirable for some owners.We recommer►d the PerFormance �ductile iron pipe.We recommend that corroslon protectfon 6e provided for any ductlle iron pipe that <br /> Graded/lsphalt cement be a PG 58-28.(lf additional resistance to rutting,scuffing and dimpling is may be imtalled on this project. <br /> des(red,we recommend utilizing a VG 6428.If add�tional resistance to cold weather aacking is desiraMe, <br /> we recommend utlifzing a PG 5&34.f <br />