1 TRENCHING OF DUCTILE IRON PIPES 2 . Our specification allows compaction of Sand(0-6mm in size) by "flooding".Is this really suitable or efficient? Class A - Load Factor 2.2 - 3.4. 3/8" 100 #4 90-100 #50 10-40 #100 3-20 #200 0-15 D. Limerock screenings, sand or other fine material shall not be used for bedding. BACKFILL The pipe shall be held down during backfilling to the top of the pipe to prevent its being Issue Date: 02/25/21 . This document specifies those materials which are appropriate for use as pipe bedding and sidefill materials. Sand for use as pipe bedding shall be clean, granular and homogeneous material composed mainly of mineral matter, free of mud, silt, clay lumps or clods, vegetation or debris. 3. Material: 4/10mm IBAA Pipe Bedding. A - Pipe and Tubing A-1 Pipe, Line, API Specification 5L A-4 Pipe, Steel, Black ASTM A-53, Grade B A-5 Tubing, Stainless Steel A-7 High Density Polyethylene Pipe Tubing A-9 Pipe, Steel, ASTM A-106, Grade B A-10 Plastic Pipe Used For Sleeving IDM H&S committee meetings for 2022 will be held via Microsoft Teams on the following Tuesdays at 12h30-13h30: 8 February 2022; 31 May 2022; 2 August 2022 SCOPE . Your goal of pipe bedding is to achieve consistency and proper support. 1. approved by: j.v.h. It is a traditional surfacing aggregate used by municipalities although it varies widely in its effectiveness based on its gradation. Title: Uses and Specifications of Silica Sand Author: Alberta Geological Survey Subject: Uses and Specifications of Silica Sand Keywords: Uses, Specifications, Silica Sand, Glass sand, Abrasive sand, Hydraulic fracturing sand, building products sand, refractory sand, moulding sand, foundry, core sand, glassgrinding sand, scouring sand, stonegrinding sand, marblegrinding sand, or Bedding 90 80 45 40 Table 2: Equivalent USCS and AASHTO Soil Classifications for Standard Installation Soil Designations Reference: ASCE 15-98, Standard Practice for Direct Design of Buried Precast Concrete Pipe Using Standard Installations (SIDD), 1998. The Engineer may require the use of a template to This specification is written as a municipal-oriented specification. Pea gravel or sand (or the material taken from the trench, if equivalent) can be used to backfill. When sand or gravel bedding is specified, the pipe shall be firmly and uniformly placed on a sand or gravel bed. Concrete sand 1/8" For use in Concrete mixtures or bedding pipe Icing sand 1/8" Use for bedding pipe and sand salt blends Anti-skid blend Use for bedding pipe and roads Product Size Range of Material General Uses. Where the backfill above the pipe contains stones larger than 40mm or where the For pipe backfill material, minus 3/8-inch crushed glass blended up to 20 percent by mass (by weight) with conventional The 2020 Standard Specifications for Highway Construction is completed and is adopted November 1, 2020. Storm water and civil construction beddings sands. Customers normally advise that trench bottoms should be excavated to provide a reasonably even bed along the pipe length and free of sharp stones or other objects that could damage the pipe. Quality requirements Section 703.2(a), Table B, Type C, except crushed glass particles can be used up to 100 percent by mass (by weight) for pipe bedding and up to a Concrete sand 1/8" For use in Concrete mixtures or bedding pipe Icing sand 1/8" Use for bedding pipe and sand salt blends Anti-skid blend Use for bedding pipe and roads Product Size Range of Material General Uses. Where trench conditions exhibit seeping water in silt or fine sand, a change from specified bedding to geotextile wrapped 19mm crushed stone is required, as determined by the Contract Administrator. 8 50 - 85 No. Package Type. the 2" shall be 12' for trenches longer 300' ex. Waste Pipe & Fittings. of the pipe or channel so that it is in place when the pipe or channel begins to operate. IV. 2. pipe bedding for sanitary and stormwater sewer utilities shall be 3 4" diameter crushed stone. Gradation per ASTM C136: PERCENT BY WEIGHT SIEVE SIZE PASSING SIEVE . Select backfill material specified in these specifications or required by the Plans shall meet all the C. Sand for bedding copper pipe shall be a dry screened sand. Piping SHALL NOT be supported on blocks to grade. 6) expansion joints in the concrete shall be provided at all pipe joints to allow for pipe flexibility, compressible filler board to be in accordance with bs en 622-1 and bs en 622-4 and to be 18mm thick. Sand. Bedding shall be placed in 6" to 8" lifts with 3% moisture or less, and compacted mechanically to achieve ninety-five (95%) Standard Proctor Test (ASTM D Crushed limestone is used extensively for bedding underground pipe TCS # 563 1 1/2-7m CONCRETE AGGREGATE WELL GRADED View Spec Sheet TCS # 270 WASHED MANUFACTURED SAND; TCS # 573 ASTM SAND; Concrete Aggregate; Ballast; Hot Mix Aggregate; Oversized Rock; Call Us: 800-772-8272 Se Habla Espanol Call Us Today: 800-772 600 Structures and Concrete 12. Observe the pipe while being laid to be sure the pipe has full bearing and is fully into the pipe bedding and is centered in the trench. Continuous, uniform support under the pipe prevents unequal settlement of the pipeline. A bedding of 100 mm (4 in) of uncompacted material with a maximum particle size of 19 mm ( in) is required. 5.04.01 Water Pipe Bedding Sand: Bedding Sand shall be free of ice, clay, excessive organic matter and other deleterious material, and shall conform to the requirements for Class A Backfill as defined in the Standard Specifications for Public Works Construction, Aggregates for Bedding and Backfill. 2.04 BACKFILL UNDER MANHOLES AND METER VAULTS C. Place backfill material in trench. Mix the bedding material (Mortar, cement-sand mix, etc.) The pipe bedding factor of 1.5 depends on the granular material being laid flat and the weight of the pipe causing it to settle slightly into the bedding material after placement. Soil Pipe & Fitting; Solder Ring Fittings; Gas Pipe Fitting; MDPE Fittings; Show more. (CLSM), commonly called flowable fill. 306.2 Trenching and bedding Solid and load bearing support required. Extend this material a minimum of 6 in. Hydraulic Conductivity 175 mm/hr Fibre Content (pp) n/a GFN n/a D90 - D10 - D90/D10 - D eff - c. ASTM D 1556 - Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method. Pipe Bedding and Backfill. Page No. of fine granular material for precast box sections on the base of the excavation before placing the box sections. Depth includes 4 inches of bedding sand under gas line & 6 inches of sand shading over the gas line, & typical excavation trench width of 12 inches. Pipe Bedding. Cut-off shoring permanently left in place 1.2 metres below grade unless otherwise indicated in the Specifications or directed by the Contract Administrator. 204.0 (09/2000) Word. People also downloaded these PDFs. Typically, our Pipe Sand is placed at the bottom of the trench underneath where the pipe is to be laid as bedding sand. 3725:2007 Concrete Pipes, or AS/NZS 2032:2006 Installation of PVC Pipe systems, for such depths as are necessary. Sand and Gravel 1,500 Sand and Gravel With Clay 2,000 Sand and Gravel Cemented With Clay 4,000 Uni-Bells Specification Uni-B-13 Joint Restraint Devices for Use with PVC Pipe. Design manuals and computer locations. Design Criteria and otherwise meets the requirement of this standard and specification. Events and seminars hosted and/or organised by the IDM are indexed on the respective IDM calendars. Do not use limestone screenings, or stone dust, or sand for the bedding sand material that does not conform to the grading requirements of [ASTM C 33][CSA A23.1-FA1]. 4.5 Surface Material for Re-use - All surface There is an H-20 traffic load rated Infiltrator necessity for the additional bedding material was caused by an act or failure to act on the part of the Contractor or is required for the control of groundwater, in which case the Contractor is responsible for the expense of the additional excavation and material. It covers the The material shall meet the requirements of NYSDOT Standard Specifications, Section 703-06 Cushion Sand, latest revision. materials and hypodermic needles meeting the following specifications: Gradation 100 percent of crushed glass particles must pass the 9.5 mm (3/8-inch) sieve. Section 602 Storm Drain Inlets, Catch Basins, Manholes, and Gravity Irrigation Structures J. Weight. 1) Metal pipe gauge: Examples 12, 14, 16 2) Metal pipe corrugation dimensions: Examples 2 2/3 x ; 3 x 1 3) Concrete pipe strength: Examples Class III, IV or V 4) pH and Resistivity needs to be known by designer Aggregates Base, Subbase, Select Subgrade, and pipes, flexibility is directly proportional to the Dimension Ratio (DR). PIPE EMBEDMENT MATERIALS. Section 704 Precast Concrete Project Specification 1 Trenching, bedding and backfilling for underground services 1.1 Scope This Section details the requirements for trenching, bedding and backfilling for pipes and underground services of the form and dimensions shown on the Drawings, and as specified in these Specifications. FIG. A common unacceptable practice is to support piping on small piles of sand etc. If the trench width is exceeded for any reason within the Contractor's control, the stronger pipe or improved bedding and backfill will be provided at the Contractor's expense. Specification for Aggregates Base, Subbase, Select Subgrade, and Backfill Material Page 1 of 8 TS 1010 September 2017 Amendment to OPSS.MUNI 1010 (Apr 2013) Material Specification for . Install our transmission pipe with proper bedding for uniform longitudinal support. Tamp sand bedding as required for firm support. Once hydrated, the material conforms tightly to complex shapes, like trench side walls, bedding material, and the curvature of a pipe. Pipe Protection / Underground Marking. Check Pages 251-300 of JKR_Standard_Specification 2014 in the flip PDF version. To view, simply click the specification number. This will add additional stability and prevent the base from shifting position. Quality requirements Section 703.2(a), Table B, Type C, except crushed glass particles can be used up to 100 percent by mass (by weight) for pipe bedding and up to a by Ahmad Shahrir. This specification covers high density polyethylene pipe and tubing in nominal diameters Full PDF Package Download Full PDF Package. Water distribution pipes must have 6 inches of sand bedding that conforms to the requirements of Section 50-13.02, Graded Sand, of these Specifications. If existing soil is too porous to hold sand, a geotextile fabric approved by the Agency must be placed on the trench bottom. Pipe bedding material shall be placed at a minimum thickness meeting the greater of the following criteria: 1. Bedding Types. Bed the pipe in a foundation of compacted cohesionless material, such as sand, crushed stone, or pea gravel, with a maximum allowable size of 1 in. agg. Specifications or directed by the Contract Admini strator to leave shoring permanently in place. This will make the joints between the paver solid and prevent moisture from getting under the pavers. Multi-purpose for jobs such as steps, bedding in drains and manhole covers, driveways, paths, floors, shed and greenhouse bases, and paving block and slab foundations; 8 month shelf-life; For interior and exterior use; Suitable for most small concrete jobs, such as concreting, steps, bedding manholes, driveways Enviro Sand. This zone provides even support for the pipe Sand/silt and sand/clay mixtures. approved by: j.v.h. The term silica sand is applied to qua rtz sand that conforms to the specifications of which the main composition is SiO2 >99%, with very little contaminant contents and heavy minerals of The pipe-soil system eventually reaches a point of equilibrium where the soil above the pipe forms an arch and further deflection of the pipe ceases. 4 75 - 100 No. Apply enough bedding material to support the entire bottom of the shower base. Before any pipework is installed the bedding material should be laid evenly along the bottom of the trench. For pipes 300mm diameter and smaller the surface of the granular bedding material shall be blinded with sand to provide a smooth bedding for the pipe. Typically a naturally occurring material that has a high clay/fine silt content to ensure the material can hold its shape when used under concrete slabs, base for pipe laying. Bureau of Construction & Materials, 7th Floor. *** Trenching and pipe bedding Superseded Date: 05/27/20 . The Grading Curve for Good Sand Surround for MV and LV Cable 100% Particle Size (mm) Duct surround material must be well compacted around ducts without damaging the ducts Add 2.7.4 2.7.4 Pipe bedding and surround material for polyencased watermain to be clean, high electrical resistivity sand pipe bedding material (with less than 50 ppm chloride ions and less than 50 ppm sulfite ions), wash coarse natural or manufactured sand with 100% passing 6.00 Section No: MS A-7 . Another alternative uses 50lb paper bags of traditional bentonite chips or sand bags (stacked in the trench) to achieve a dam or collar around a pipe. For PVC pipes 6 in diameter and greater, limit particle size in the embedment zone to 1 or less. Bedding: Typically four to six inches of supportive, compacted material. Previous contents of sub-clause 3.6.2 relocated to clause 3.6.6 and replaced by new sub-clause titled Construction, Refer to TMWA Standard details 10L-6 and 10L-7 for bedding sand zone. Bedding Sand Typically a naturally occurring material that has a high clay/fine silt content to ensure the material can hold its shape when used under concrete slabs, base for pipe laying. 30 Full PDFs related to this paper. Call (250) 758-2401 to arrange delivery. Kindly note certain events may require an R.S.V.P or registration. bedding as per specifications preformed wye opening undisturbed earth top of the pipe and sand backfill to grade as per specifications wye or preformed tee to be used unless otherwise approved by the city engineer designed by: t.s.s. Trenches should be excavated to allow for the specified depth of bedding, the pipe diameter and the minimum recommended cover, overlay plus backfill, above the pipes. Compact the backfill at the sides of the PE pipe. +OO mm 1C Trench in Hard Sand Bedding. At TYPAR Geosynthetics, we create performance based replacements for building staples like stone, sand and asphalt. Quote (Ron) Colour. 400 Asphalt Pavements 12. Compaction Test of Sand Bedding by Clegg Hammer (part 1 ) Compaction Test of Sand Bedding by Clegg Hammer (part 2 ) Buried FRP Pipe Installation Mechanical Completion of Pipework Welding Procedure Specification Welders Qualification Log Welders Performance Chart Daily Field Weld Report Welcome to ADA SAND & GRAVEL. This Paper. Below is an index of all the specifications that can be viewed and/or downloaded individually. Washed, fine aggregate sand shall conform to the requirements of NYSDOT Item No. Sewer lines in sand, possibly in pea gravel: Our contractor for the sewer line replacement project documented in this article used clean sand for bedding the new sewer piping. OPSS 401.07.10.03 Bedding . Very Coarse Sand 1.00mm 0.0 Coarse Sand 500um 0.2 Medium Sand 250um 6.2 Fine Sand 150um 44.8 Fine Sand 125um 15.4 Very Fine Sand 63um 28.0 Silt -63um 4.2 Clay Clay 1.2 TYPICAL ANALYSIS Moisture Content 9.20% w/w Organic Content n/a pH Value (H 2 O) 6.8 Sat. After the excavation has been made, no special bedding needs to be used for PVS Duct. In an attempt to develop such a system, this paper presents the following: 1) A summary of the current practices of classification and specification of bedding and backfill for water/wastewater and storm drainage pipelines. We brought a fill sand to the job and the lab came back with 12% passing the no 200 sieve. Bell and coupling holes may be provided to accommodate the joining of the pipes. Stabilize trench and install pipe bedding materials. the pipe except where rock excavation is involved. 3.6.1 . 4-08-01, Issue 4 + its Amendment of November 2008. 45 . Table 3: Reinforced Pipe Classes for 0.01 inch Crack Per ASTM C 76 (lbs/ft/ft) JAR - VERSION 2 2020 JS. G. PIPE LAYING The Inspector must check the following while pipe is being laid: 1. Place at least 2 in. F. Section 305 Pipe Bedding G. Section 306 Trench Backfill H. Section 601 Culvert, Storm Drain and Gravity Irrigation Pipe I. Aggregate. If you have any questions or comments, please contact: Construction: Jason VanNice. Sand, gravel, or crushed rock bedding When sand, gravel, or crushed rock bedding is specified, the pipe shall be firmly and uniformly placed on the bedding material. Specification for 4/10mm IBAA Pipe Bedding. C. Pipe Bedding and Backfill 1.02 DESCRIPTION OF WORK A. Excavate trench for pipe installation. MnDOT Standard Specifications for Construction 2020 Volume I - Divisions I and III (PDF) MnDOT Standard Specifications for Construction 2020 Volume II - Division II (PDF) The 2020 edition is effective for most projects let on or after Jan. 27, 2022. Material for bedding shall not exceed 1 inch in diameter. Sharecost Rentals & Sales | (250) 758-2401 Google Scholar. Pipe Bedding 10mm. Constituents: IBA Ash, Brick, Concrete, Rock, Stone, glass, sand etc, may contain trace metals (typically <1%). This version of the 2022 Standard Specifications is in 8.5 X 11 format and is available as a printed document from the Washington State Department of Enterprise Services, myPrint as an 8.5 X The Standard Specifications have been developed to serve as a baseline for the work that is delivered to the public by the Washington State Department of Transportation. *PVC tape is not required for the PVC Spiral Pipe System . 2020 edition. The embedment material may be imported, such as a crushed stone, or it may be the ("native") material excavated from the trench to make room for the pipe. NOTE: The 2015 Standard Specifications can be ordered by using the Standard Specifications and Construction Manual Order Form. On the other hand DR 32.5 pipe has a PS of about 12.5 psi. Subaru's EJ251 and EJ252 were 2.5-litre horizontally-opposed (or 'boxer') four-cylinder petrol engines. Compacting of embedment, bedding, cover, and backfill materials during pipe installation shall be according to TS 501. D. Limerock screenings, sand or other fine material shall not be used for bedding. A coarse sand consisting of a range of granular sizes within the concrete sand specifications. 10%. Note: See Specification 4130.01 for bedding plane/concrete slab thickness requirements. pipe zone bedding per standard specifications for section 306-6 temporary and permanent trench resurfacing shall be in accordance with substation 306-13 of the standard specification for public works construction (green book). Ahmad Amirul. Sand or Gravel Bedding, or Drain Fill. River Sands Pipe Sand is ideal as the bedding and backfill sand around pipes. It can also be used in different construction environments including plumbing trenches and house slabs. Typically, our Pipe Sand is placed at the bottom of the trench underneath where the pipe is to be laid as bedding sand. Approved HDPE pipes and accessories Dune sand Precast concrete blocks Approved hdpe pipe bedding and surround material Approved backfilling materials Detectable warning tape Concrete grade C20 as blinding, hdpe pipe bed and surround. Standard Construction Specifications PIPE EXCAVATION, BEDDING 201 September 3 AND BACKFILL Page 5 of 11 2.2 EXCAVATED BEDDING MATERIAL .1 Excavated bedding material for Class "C" or "D" Bedding installation shall be unfrozen clay, silt, sand or gravelly sand excavated from the trench which shall be 5. PIPE BEDDING is loaded for shipping with our direct to rail transfer system. Working on a job where the spec for bedding is a max of 5% passing 200 sieve and 90-100% passing a no.4 sieve. Concrete for pipe bedding shall be Type C manufactured using Type 50 sulphate resistant Portland cement as described in Section 02512 Ready Mixed Concrete. (gravel or sand) containing little or no fines, or specification graded materials, require less compactive effort, and are preferred. The Contractor should normally be offered in contract specific Appendix 5/1 the full selection of alternative pipe and bedding combinations determined in accordance with CD 533 (DMRB 4.2.5) as detailed in the HCD for pipes up to 900 mm internal diameter. Adjunct membership is for researchers employed by other institutions who collaborate with IDM Members to the extent that some of their own staff and/or postgraduate students may work within the IDM; for 3-year terms, which are renewable. Compliant with RMS QA Specification R11 Bedding & Haunch. All Bedding. RE: SAND AS TRENCH BACKFILL MATERIAL AND APPLICABLE COMPACTION METHOD TO BE USED dik (Structural) 26 Oct 17 12:03. 4.2 Gas Pipe Sand Bedding: Material shall be free of ice, clay, organic matter or other objectionable material, and shall conform to the following standards: 4.2.1 . Polyvinylchloride, Unplasticised (PVC-U) Pressure Pipes 369 Bottom Ash Sand for Pipe Embedment WSA PS 400 Submersible Electric Pumps for Sewage Pumping Stations WSA PS 401 . Provide imported bedding for the pipe if the trench bottom is not smooth (refer to Engineering Material Specification [EMS] EMS-4123, Backfill Sand). 700 Drainage, Traffic, The bedding is tamped thoroughly to ensure good compaction around and under the pipe. DR 7.3 has a Pipe Stiffness (PS) per ASTM D2412 of about 1600 psi. To save to your computer, right click the specification number and select "Save Target As.." The files are in the Adobe .pdf format. For acceptance, there must be a clear line of demarcation. Download. Copy and paste this code into your website. Where is Pipe Bedding Used. bedding as per specifications preformed wye opening undisturbed earth top of the pipe and sand backfill to grade as per specifications wye or preformed tee to be used unless otherwise approved by the city engineer designed by: t.s.s. The course sand will bind together when you go over the pavers with the compactor. *Specification for centrifugally cast ( spun ) ductile iron pressure pipes for water, gas and sewage. E. All pipe bed ding materi al shall be new , un less othe rwise app rov e by the Depa rtment. exceeded, the Contractor must provide stronger pipe or improved bedding and backfill conditions, as approved by the Agency to meet the changed load requirements. 700 SW Harrison St. Topeka, KS 66603-3754. SCRAP 2020 Standard Specifications. A crushed recycled bedding/fill sand, with better compaction than dune or river sands ie. PIPE AND TUBING High Density Polyethylene Pipe and Tubing Form No. Sand or gravel fill shall be carefully placed and compacted as specified herein and as shown on the drawings. Classification and specifications of siliceous sands Ralph Tuck. fill, pipe bedding, surface 100 15-60 0-30 DSA driving surf. For further detail, consult Approved Document H of Building Regs. It can rest right on the ground, or be set in sand or light aggregate. The sidefill material must be the same as the bedding material and extended to the crown of the pipe and be thoroughly compacted. .9 Repair pavements, boulevards, pipes, utilities and structures as directed by the Contract Hardcore. JKR Standard Specification. Previous editions of the SUDAS Standard This Specification shall be read in conjunction with MRS01 Introduction to Specifications, pipe and conduit trenches, all materials [description] m . Bulk Bag. Specification for duct surround material 50-75mm The thermal resistivity of the duct surround material must be maximuml .0km/watt @O% moisture content. crushed particles giving better mechanical interlock than round grained sands. a. ASTM C 12 - Standard Practice for Installing Vitrified Clay Pipe Lines. Low DR pipes such as DR 7.3 have high resistance to deflection because their flexibility is very low, or conversely their stiffness is high. OPSS 401.05.02 Bedding Material . 5. initial backfill: suitable material shall be class i, ii or iii in the pipe zone extending not less than 6" above crown of pipe. Associate membership to the IDM is for up-and-coming researchers fully committed to conducting their research in the IDM, who fulfil certain criteria, for Download Download PDF. 300 Aggregate Base Courses 12. Fig. pipe bedding specification in the uk, how to install pipework and bed on a granular fill. specification for drainage pipe bedding. It can also be used in different construction environments including plumbing trenches and house slabs. Gradings/specifications available for 4/10 IBAA: Grading Asbestos Screening Chemical analysis. 3.6.2 . stabilized sand bedding shall surround HDPE pipe larger than 42" by a minimum of 18" on top and both sides and by 12" on the bottom. Benedict produces a core range of sand based products and specialty sand blends. There are numerous 'classes' of bedding for drainage, designed to suit all sorts of ground conditions, pipe types and anticipated loadings. For information on South Africa's response to COVID-19 please visit the COVID-19 Corona Virus South African Resource Portal. Site Planning. III - 169 . Each class is identified by a different letter. Page 9-2 2022 Standard Specifications M 41-10 9-00 Definitions and Tests 9-00.8 Sand Equivalent The sand equivalent will be the average of duplicate determinations from a single sample. PDF Pack. Material laid below a pipe that supports the pipe against the top and adjacent soil load on the pipe, to prevent pipe failure -10mm. The sand equivalent sample will be prepared in accordance with the FOP for AASHTO T 176. Eleven (11) specification have been revised. All Bathroom Vanities. This product is a fractured rock mix with sizes as small as #200 and meets a specification requirement. Other Than Pipes and Box Culverts. Pipe sand River Sands Pipe Sand is ideal as the bedding and backfill sand around pipes. Provide firm and uniform support of piping at indicated elevations and grades. Note: Friction Type 4 or better, sand equivalent of not less than 45, and organic materials maximum 0.01%. 32104 : Backfill with Stabilised Sand to [description] m . 32407 : Backfill with Lean Mix Concrete to [description] m : Detectamesh. C. Shaping and Bedding. 1.2 Scope 'Earthworks' refers to all operations involved in Colour and aggregate shape varies regionally. 16 25 - 60 No. sand bedding layer approved excavated material compacted to 93% mod aashto density in layers not exceeding 150mm in thickness block paving legend: s = working space each side of pipe, min 200mm b = od of pipe selected gravel material approved by the designer, with a pi < 6, and compacted to 93% mod aashto density thickness and grading of wearing Size Fraction: 4/10mm. Minimum thickness of sand bedding under concrete, clay, and cast-iron pipe shall be 2 inches. or Bedding 90 80 45 40 Table 2: Equivalent USCS and AASHTO Soil Classifications for Standard Installation Soil Designations Reference: ASCE 15-98, Standard Practice for Direct Design of Buried Precast Concrete Pipe Using Standard Installations (SIDD), 1998. Table 3: Reinforced Pipe Classes for 0.01 inch Crack Per ASTM C 76 (lbs/ft/ft) PEA GRAVEL - PEA GRAVEL BEDDING SHALL BE A CLEAN MIXTURE FREE FROM ORGANIC MATIER AND CONFORMING TO THE FOLLOWING GRADATION WHEN TESTED IN ACCORDANCE WITH ASTM D422: FOUNDATION MATERIAL U.S. SIEVE SIZE CLASS A CLASS B PIPE ZONE BEDDING 2 )f' 98-100 95-100 100% )2" 2" 92-100 75-100 85-100 -%" This Technical Specification forms part of the Transport and Main Roads Specifications Manual. Do not compact the backfill directly over the pipe until there is at least 12 of cover. Doc Name: Product Specifications for Products & Materials Page 2 of 22 . Take care when dumping 50 You may have to fill in areas and re-screed to achieve a flat, uniform layer of bedding sand. Pipeline beds are sloped, especially gravity lines, so frankly I am surprised to see gravel being thought about here, as that would permit water to run down the full length of the trench, at least in a worst case scenario.