02720 Sanitary Sewer Collection System - City of Daly City

More documents

Recommendations

Info

3.03 COMPACTIONCompaction shall be in accordance with Section 02221 - "Trench Excavation andBackfill," of these specifications.3.04 PIPE INSTALLATIONA. Pipe and appurtenances shall be installed in accordance with the best practice, andin conformance with the applicable requirements of ASTM C 12 "Standard Practicefor Installing Vitrified Clay Pipe Lines" andlor, ASTM D 2321" Standard Practicefor Underground Installation of Flexible Thermoplastic Pipe for Sewers and OtherGravity-Flow Applications" and these specifications. Pipe laying shall start at thelow end of each section and proceed upgrade. All bell and spigot pipes shall be laidwith the bell end upgrade. Excavate bell holes for each pipe joint. All pipes shallbe laid on a bed prepared by handwork, dug true to line and grade, to furnish a trueand firm bearing for the pipe throughout its entire length. Adjustment of pipes toline and grade shall be made by scraping away or filling in and tamping materialunder the body of the pipe throughout its entire length, not by blocking or wedging.B. For vitrified clay pipe with flexible compression joints, the mating surfaces shall bewiped clean of dirt and foreign matter, and an approved lubricant as recommendedby the pipe manufacturer shall be applied to the joint surfaces. The spigot shallthen be positioned inside the bell and the joint shoved home. For small diameterpipe, this operation may be done by hand, but on large diameter pipe, a leverattachment or a bar cushioned with a wooden block shall be used to shove the jointinto place.C. Mission MR Series ARC rubber-couplings or equivalent shall be used to makeconnections on plain end pipe in accordance with the manufacturer's instructions.D. After each pipe had been brought to grade, aligned, and placed in final position,initial backfill is to be placed in accordance with section 02720 - 3.08 "TrenchBackfill".E. Vertical deflections in the pipe shall not exceed one quarter (%) inch. If uponinspection vertical deflections/bellies/sags exceed the one quarter (%) inchtolerance, the pipe shall be adjusted or replaced accordingly.F. Mandatory use of shoring at designated locations shall not relieve the Contractor ofthe responsibility to install shoring at other locations required by the City's ProjectInspector or where necessary for safety of workers or the general public.G. Shoring shall be withdrawn only after backfill above pipe has proceeded to a heightequal to or greater than three-quarters (314) of the excavation depth. Bottom crossbracing and wallers may be left in place upon removal of the sheathing. Backfillshall be brought to the level of the cross-braces before these are removed. Shoringshall be cut above the pipe and left in place only when so required on the plans.Section 02720 - 14 (09/24/07)
H. The Contractor is solely responsible for installing and extracting the shoring in amanner that will not disturb the line, grade, backfill compaction, or operation of theutility being installed or adjacent utilities and facilities.I. Ductile iron pipe and fittings shall be prepared, sealed and cut in accordance withthe manufacturer's recommended procedures.J. Place pipe that is to be bedded in concrete cradle or encased in concrete in properposition on temporary supports. When necessary, rigidly anchor or weight the pipeto prevent flotation as concrete is placed. Place concrete for cradles, arches orencasement uniformly on each side of the pipe and deposit at approximately itsfinal position. Concrete placed beneath the pipe shall be sufficiently workable sothat the entire space beneath the pipe can be filled without excessive vibration.K. The minimum horizontal centerline to center line separation between sewer andwater mains or laterals shall be ten feet zero inches (10'-0") to conform to sewerseparation guidelines. Vertical clearances shall be as directed or shown on theproject plans. In any case, a minimum clear space separation of twelve (12) inchesshall be provided, with sewer line on lower level than water line.L. At the end of each workday, all open ends of pipe installed shall be plugged to thesatisfaction of the City's Project Inspector.3.05 SEWERSLIPLININGA. IntentIt is the intent of this portion of the Specification to provide for rehabilitating sewerlines via the installation of a fiberglass, high density polyethylene (HDPE) orpolyvinyl chloride (PVC) sliplining pipe.B. Scope of WorkShall be per the design submittal and the contract documents.C. Materials1. Fiberglass pipe shall be centrihgally cast with glass fiber reinforcement in a curedthermosetting resin manufactured in accordance with ASTM D3262, cellclassification Type 1, Liner 2, Grade 3. Pipe stiffness shall meet the designrequirements in the following Section 4.2. Fiberglass liner shall be shown by teststo be resistant to long-term corrosion. Testing shall be performed in accordancewith ASTM D368 1 using 1 .ON sulfmc acid for sanitary sewage, and ASTM C58 1for industrial sewage.2. PVC pipe shall have a minimum cell classification of 12364 B or C as defined inASTM D1784. Pipe shall be closed profile. The joint shall be designed so thatSection 02720 - 15
Page 3: SECTION 02720 - SANITARY SEWER COLL
Page 6 and 7: 1.04 QUALITY ASSURANCEA. All materi
Page 8: 2.03 POLY-VINYL CHLORIDE (PVC) & HI
Page 11 and 12: 2.07 MANHOLE FRAMES AND COVERSA. Ma
Page 13 and 14: In addition to thrust blocks, all m
Page 15: 3.0 1 TRENCH EXCAVATIONA. All pipe
Page 19 and 20: c. The completed joint shall comply
Page 21: 4. Installationa. Unless otherwise
Page 28 and 29: Sieve SizesPercent Passing10095-100
Page 30 and 31: . Optimum moisture content in perce
Page 32 and 33: and a drop cloth shall be used to c
Page 34 and 35: C. Downward AdjustmentsDownward adj
Page 36 and 37: . The homeowner shall be responsibl
Page 38 and 39: g. Grinder Pumpi. EquipmentSimplex
Page 40 and 41: The movement of the ball shall be c
Page 42 and 43: ii. The maximum allowable head of w
Page 44 and 45: ii. When the prevailing groundwater
Page 46 and 47: each subsequent sewer manhole to es
Page 48 and 49: G. Acceptance1. CONTRACTOR shall pr
Page 50 and 51: covers not to be reused shall be de
Page 52 and 53: CONTRACTOR shall assume all respons

02720 Sanitary Sewer Collection System - City of Daly City

Create successful ePaper yourself

Delete template?

Save as template?