1957 566 Ordinance - Laserfiche WebLink

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sidewalks pavement and driveways, furnishing of suitable backfill material if necessary, reseeding lawns and reply cing of trees and shrubbery damaged by Contractor and all appurtenant work incidental thereto. (b) B.~CI~'ILL 3~.~Ti~RI11JJ: Backfill may be made from excavated material from the trench if sane is satisfactory to the engineer. Only fine dry earth or bank sand shall be used under, around and to a depth of at least -two feet (?. ~) above any pipe, f.itting•, special or curb connect~_on. P1o slag, ashes, rubbish, broken concrete, stones larger than three inches (.3") in greatest dimension or otl~er deleterious or objectionable mater~_al may be used in baclu°ill. I~1o backfill shall be done during freezing v~reather except by permission of Engineer and no backfill shall be made i~rhen the material alr^eac?y in the trench is frozen rior shall frozen ?Material be used. in backfill. (c) SATvv B1iCl{,l~ ILTJ: ::here ordered by r'.r~,ir_cer the excavated material shall be removed from the site of ~~rorl: and back sand containing not more than 10;~ by vreight of loam or c7_ay and free from all deleterious or objectionable ;n.terial, sYlall pass a 3~1~ inch sieve and not more than 5i sha7.1 remain ors a ~~~ sieve. if required this sand ba.ckE'i11 shall be thoroughly compacted by mechanical tunrp~rg in layers of not rnore than 6~~ or by flooding as may be directed by ;engineer. Sand for backfill, if ordered, ti•,rill be paid for at coraract price set forth in the proposal, unless it is included in the unit price on bid blank. (d) 51~LCIAJJ TI?~1TI~i1F,i''T IN CITJJER EXCxVf1TI01~T: Special treatment of the trench will be required where cinder excavation, exceeding one foot measured from the top surface, is encountered. lief ere laying the pipe, the bottom of the trench shal.7. b e dug bc~l.ovr grade and then brought to the grade of the pipe in the following manner: A four (1~.) inch layer of crushed lime stone shall. be placed or1 the ,entire width of the bottom of the trench, f'ollovred by a filler of hydrated lime and a layer of three (3) inches of sando The crushed lime stone shall be vrel.l graded from fine to coarse, and free fro;n slag, cinders,. ashes, rub'oish or other objectiona:~le material. .~11 lime stone must be capable of being passed through a 3~l~ inch sieve, On top of this layer of crushed stone, hydrated lime shall be sup~~lied in the amount of 3~8 of a pound per square foot of trench. This bed of crushed line stone shall be thor- oughly tamped before the iii layer of sand is placed. The backfill around and to the depth of 3 inches above the top of the pipe shall be made v~tith sand. The Contractor must use special care in placing this poxtion of the backfill so as to avoid injuring or n;cving the pipe when compacting same. On top of the sand the Contractor shall place another layer of crushed lime stone five (5) inches tlri ck o n the entire ord. dth of the trench. On top of the compacted layer of ]_-i:ne stone hydrated lime shall b e then applied in the amount of.' 3~1~. of a pound per square foot of trench. Tlie ron~.a.ining bacT<.fi11 shall be made tivith sand., care- fully placed ar~d compacted by tamping, pudd.lin~;, or rolling. X111 pre- cautions shall be taken to eliminate future s~tt1_ement. ^l he treatment of the trench bottom, previously desc~iLed, may be omitted wl-iere the cinder depth, measured from the top surface does not exceed 2 ~-6~~ . - 1.3 --