TABLE OF CONTENTS F 400 SEWER MATERIALS AND

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Bureau of EngineeringManual - Part FSEWER DESIGN9/088/07F 400TABLE OF CONTENTSF 400 SEWER MATERIALS AND STRUCTURESSECTION NO.SUBJECTDATEF 400SEWER MATERIALS AND STRUCTURESAugust-07F 410SEWER PIPE"F 411VITRIFIED CLAY PIPE"F 412REINFORCED CONCRETE PIPE"F 413CONCRETE PIPE"F 414ASBESTOS CEMENT PIPE (ACP)"F 415PLASTIC PIPE"F 415.1COMPOSITE PIPE (TRUSS PIPE)"F 415.2ABS SOLID WALL PIPE"F 415.3PVC SOLID WALL PIPE"F 415.4PE SOLID WALL PIPE"F 415.5CCFRPM PIPE"F 415.6DIRECT BURIAL PROFILED WOUND PE"F 415.7DIRECT BURIAL CLOSED PROFILE WOUND PE"F 415.8OTHER PLASTIC PIPES"F 416CORRUGATED STEEL PIPE"F 417DUCTILE IRON PIPE"F 420REINFORCED CONCRETE BOX"F 421RCB ECONOMIC COMPARISON"F 422RCB DESIGN RESPONSIBILITIES"F 430SEWER PIPE JOINTS"F 431JOINTS LISTED IN SSPWC"F 431.1JOINTS FOR VCP PER SSPWC"F 431.11TYPE D JOINT"F 431.12TYPE G JOINT"

Bureau of EngineeringManual - Part FSECTION NO.SEWER DESIGN9/088/07F 400SUBJECTDATEF 431.13TYPE Z JOINTAugust-07F 431.14TYPE C JOINT"F 432RCP JOINT"F 433JOINTS IN REINFORCED CONCRETE STRUCTURES"F 440SEWER MAINTENANCE HOLES"F 441SEWER MAINTENANCE HOLE APPURTENANCES"F 441.1SEWER MAINTENANCE HOLE STEPS"F 441.2SEWER MAINTENANCE HOLE FRAME AND COVER"F 441.3SEWER MAINTENANCE HOLE INNER COVERS"F 441.4SEWER MAINTENANCE HOLE DISC"F 441.5OTHER APPURTENANCES"F 441.6OUTDATED APPURTENANCES"F 442BRICK MAINTENANCE HOLE"F 443PRECAST CONCRETE MAINTENANCE HOLE AND"COATINGSF 444CLAY PIPE MAINTENANCE HOLE"F 445SHALLOW SEWER MAINTENANCE HOLE"F 446WEIR MAINTENANCE HOLE"F 447OFFSET MAINTENANCE HOLE"F 448DROP SEWER MAINTENANCE HOLE"F 449TRAP SEWER MAINTENANCE HOLE"F 449.1TRAP MAINTENANCE HOLE"F 449.2JUNCTION TRAP MAINTENANCE HOLE"F 450CLAY PIPE MAINTENANCE HOLE SHAFT"F 451SPECIAL SEWER MAINTENANCE HOLES"F 452TERMINAL CLEANOUT STRUCTURE "Y""

Bureau of EngineeringManual - Part FSECTION NO.SEWER DESIGN9/088/07F 400SUBJECTDATEF 453EXISTING SEWER MAINTENANCE HOLESAugust-07F 454REMODELING EXISTING MAINTENANCE HOLES"F 455ADJUSTING SEWER MAINTENANCE HOLES TO GRADE"F 460SPACING, SIZING AND LOCATING MAINTENANCE"HOLESF 461MAINTENANCE HOLE SPACING"F 462MAINTENANCE HOLE SIZES"F 463MAINTENANCE HOLE LOCATIONS"F 463.1CURVES"F 463.2PROHIBITED AND UNDESIRABLE LOCATIONS"F 470SPECIAL STRUCTURES"F 471BYPASS STRUCTURES"F 472JUNCTION STRUCTURES"F 473DIVERSION STRUCTURES"F 474CORE DRILLING"F 475BLANKET PROTECTION FOR PIPES"F 476SUPPORTS FOR SEWER PIPE"F 477TUNNELING, JACKING, MICROTUNNELLING AND"DIRECTIONAL DRILLINGF 477.1TUNNEL CLASSIFICATION"F 477.11FIELD TESTS AND SAMPLING"F 477.12CLASS "B" PERMIT PROJECTS"F 477.2SURVEY SHAFTS"F 478SEWAGE GAUGING"

Bureau of EngineeringManual - Part FSECTION NO.SEWER DESIGN9/088/07F 400SUBJECTDATEF 480HOUSE CONNECTIONSAugust-07F 481TYPES OF SEWER HOUSE CONNECTIONS"F 481.1ASSESSMENT ACT HOUSE CONNECTIONS"F 481.2CASH CONTRACT HOUSE CONNECTIONS"F 481.3CLASS "B" PERMIT PROJECT HOUSE CONNECTIONS"F 481.31UTILIZATION OF EXISITING HOUSE CONNECTION"LATERALS INSTALLED PRIOR TO 1965 IN PERMITRELATED CONSTRUCTIONF 482HOUSE CONNECTION REMODELING"F 483HOUSE CONNECTION LOCATIONS"F 483.1HOUSE CONNECTIONS ON HORIZONTAL CURVES"F 484HOUSE CONNECTION DEPTH"F 485PROTECTION OF PROPOSED HOUSE CONNECTIONS"F 485.1PROPOSED IMPROVEMENTS OVER PROPOSED HOUSE"CONNECTIONSF 485.2PROPOSED IMPROVEMENTS ADJACENT TO PROPOSED"HOUSE CONNECTIONSF 485.3HOUSE CONNECTIONS WHICH JOIN NEW CHIMNEYS"F 486PROTECTION OF EXISTING HOUSE CONNECTIONS"F 486.1PROPOSED IMPROVEMENTS ABOVE EXISTING HOUSE"CONNECTIONSF 486.2PROPOSED IMPROVEMENTS BENEATH EXISTINGHOUSE CONNECTIONS"

Bureau of EngineeringManual - Part FSEWER DESIGN9/088/07F 400SECTION NO.F 486.3SUBJECTDATEPROPOSED IMPROVEMENTS ADJACENT TO EXISTINGAugust-07HOUSE CONNECTIONSF 487TRAP HOUSE CONNECTION SEWER"F 488CHIMNEYS"F 489SADDLE CONNECTIONS"F 490TRENCH EXCAVATION, BEDDING AND BACKFILL"F 490.1BEDDING REQUIREMENTS FOR VCP"F 490.2BEDDING REQUIREMENTS FOR RCPSeptember-08F 490.3BEDDING REQUIREMENTS FOR PLASTIC PIPEF 491RESPONSIBILITIES FOR SEWER PROJECT TRENCHAugust-07"REQUIREMENTSF 491.1GEOTECHNICAL ENGINEER"F 491.2STRUCTURAL ENGINEER"F 491.3STREET ENGINEER"F 493TRENCH EXCAVATION LIMITATIONS"F 494BEDDING,BACKFILL,CONSOLIDATIONAND"PIPE ANCHORAGE AND EROSION CONTROL OVER"COMPACTIONF 495BACKFILL SURFACES

Bureau of EngineeringManual - Part FSECTION NO.SEWER DESIGN9/088/07F 400SUBJECTF 496TRENCH RESURFACINGF 497SUBSTRUCTURE PROTECTIONDATEAugust-07"

Bureau of EngineeringManual - Part FSEWER DESIGN9/08F 400F 400LIST OF TABLESTABLE NO.F 461F 462F 484F 490.3TITLEMaintenance Hole SpacingMaintenance Hole Sizes"Wye" Rise for 6 inch Fittings with 1/8 BendBedding Requirements for Plastic Pipe in TrenchesDATEAugust-07"""F 400LIST OF FIGURESFIGURE NO.F 484F 490.1F 490.2.C1F 490.2.C2F 490.2.C3F 490.2.C1BF 490.2.C2BF 490.2.C3BTITLEMethod of Determining House Connection and Main LineDepthsBedding Requirements for Clay Pipe in TrenchesD-Loads for Reinforced Concrete Pipe, without Bells,Case I BeddingD-Loads for Reinforced Concrete Pipe, without BellsCase II BeddingD-Loads for Reinforced Concrete Pipe, without BellsCase III BeddingD-Loads for Reinforced Concrete Pipe, with BellsCase ID-Loads for Reinforced Concrete Pipe, with Bells,Case IID-Loads for Reinforced Concrete Pipe, with Bells,Case IIIDATEAugust-07"September-08"""""

Bureau of EngineeringManual - Part FF 400SEWER DESIGN9/088/07F 400SEWER MATERIALS AND STRUCTURESThe City's existing wastewater collection system consists primarily of vitrified clay pipe (VCP) andreinforced concrete pipe (RCP) with plastic liner plate. There are some unlined concrete pipes,plastic pipes, brick arches, clay tile-lined reinforced concrete pipe and reinforced concrete boxes andarches. Existing structures are primarily brick with cement mortar or reinforced concrete lined withplastic liner plate. Standard Plans showing sewer structures and appurtenances are contained at theend of this Section for reference.

Bureau of EngineeringManual - Part FF 410SEWER DESIGN9/08F 410SEWER PIPESewer pipe materials and construction methods are specified in detail in the SSPWC and theBrownbook. The Structural Engineer shall check sewer pipe strength requirements. All sewer pipesshall be installed in accordance with the project plans and specifications. All pipe sizes refer to thenominal inside diameter of pipe.F 411VITRIFIED CLAY PIPEVCP sewer pipe may be specified in sizes 6 inch through 42 inch. Except as modified by theSSPWC and the Brownbook, VCP and fittings shall be extra strength manufactured in accordancewith ASTM C 700.F 412REINFORCED CONCRETE PIPERCP shall be used for sewers larger than 42 inch. Except as modified by the SSPWC andBrownbook, RCP shall be manufactured in accordance with ASTM C 76. Plastic liner platecircumferential requirements shall be determined and shown on the plans. Plastic liners shall bePolyvinyl Chloride (PVC) conforming to the SSPWC, Brownbook, and Standard Plan S-121. Theliner plate shall extend a minimum of 2 inches below the hydraulic grade line at minimum flow.Minimum strength of RCP with or without bells for Bedding Case I, II, and III shall be inaccordance with Figures F490.2.C1, F490.2.C2, F490.2.C3, F490.2.C1B, F490.2.C2B, andF490.2.C3B.F 413CONCRETE PIPEUnreinforced concrete pipe is not permitted for use in City sewers.F 414ASBESTOS CEMENT PIPE (ACP)ACP is not permitted for use in City sewers.

Bureau of EngineeringManual - Part FF 415SEWER DESIGN9/088/07F 415PLASTIC PIPEBecause of the rapidly changing nature of sewer pipe materials, this subsection is subject tomodification. In general, plastic pipe is permitted on any sewer as long as it is on the Engineer ofDesign’s Approval Pipe and Pipe Product Suppliers List.The use of plastic pipe is governed by the following criteria:a.Plastic Pipes can be bid as an alternate to VCP or RCP.b.Plastic pipes shall not be permitted where concentrated discharges of industrial orcommercial sewage exist. Where this cannot be avoided the sewer shall not bepermitted to be constructed of plastic materials.c.Plastic pipe may be used when abrasive action in the sewer is not anticipated. Flowvelocities and the amount and types of solids generated shall be considered todetermine abrasive action. Generally, velocities should not exceed 12 fps.d.Plastic pipe sewers shall be limited in size to:1.2.Main Line: 8 inch to 15 inchHouse Connections: 6 inch minimum.e.The maximum design deflection (flattening) for plastic pipe shall be 3 percent forPVC Composite Pipe and 5 percent for Solid Wall PVC and ABS pipe. To assurethat solid wall plastic pipe has sufficient stiffness, the minimum wall thickness SDR(standard dimension ratio of pipe outside diameter to pipe wall thickness) shall be 35for PVC.f.Since concrete will not bond to most plastics, some form of seal or water stop isrequired to provide a watertight maintenance hole connection. A maintenance holecoupling, can be cast directly into the maintenance hole or base or grouted intoprecast concrete maintenance holes. As an alternative, a rubber adaptor ring can beplaced around the pipe stub to be cast into the maintenance hole wall

Bureau of EngineeringManual - Part Fg.SEWER DESIGN9/088/07F 415Unless specified, the design criteria shall be the same as currently used for clay pipesewers.Prior to the preparation of any sewer plan, the Engineer shall investigate and determine if plastic pipeis suitable for the project as an alternate pipe material. If plastic sewer pipe is acceptable, the plansshall call for "Sewer Pipe". If plastic sewer pipe is unacceptable for the project, the plans shall callfor "VCP" or "RCP".F 415.1COMPOSITE PIPE (TRUSS PIPE)Composite pipe is a plastic pipe consisting of two concentric tubes with a "truss" connecting the twoconcentric tubes. The pipe between the concentric tubes is filled with cementitious slurry or inertmaterials. The plastic tubes shall be Acrylonitrile-Butadiene-Styrene (ABS). The requirements forthis pipe are set forth in ASTM D2680 and modified by the SSPWC and Brownbook. This pipe maybe used for main line and HC sewers.F 415.2ABS SOLID WALL PIPEABS pipe maybe used for both main line and HC sewers. Requirements are set forth in the SSPWCand Brownbook.F 415.3PVC SOLID WALL PIPEPVC pipe may be used for both main line and HC sewers provided the following requirements aremet:a.Only pipe conforming to ASTM D3034 is approved.b.Minimum wall thickness shall conform to Standard Dimension Ratio (SDR) 35.c.Fillers in the resin shall not exceed 10 parts per 100 parts of resin by weight, of the PVCresin (See SSPWC).d.All requirements set forth in the SSPWC and Brownbook are met.

Bureau of EngineeringManual - Part FF 415.4SEWER DESIGN9/088/07F 415.4PE SOLID WALL PIPEPE Pipe may be used for both main line and HC sewers provided the following requirements aremet:A.Only pipe conforming to ASTM D 3350 is approved.B.Minimum wall thickness shall conform to Standard Dimension Ratio (SDR) 21.C.Pipe and fitting shall be made from PE resing complying with ASTM D 1248.D.All requirements set forth in SSPWC and Brownbook are met.F 415.5CCFRPM PIPECCFRPM Pipe may be used for main line sewers provided the pipe confirms to ASTM D 3262 andall requirements set forth in SSPWC and Brownbook are met.F 415.6DIRECT BURIAL PROFILED WOUND PEDirect Burial Profiled Wound PE pipe may be used for main line sewers provided the product is onthe Engineer of Design’s Approval Pipe and Pipe Product Supplier’s List.F 415.7DIRECT BURIAL CLOSED PROFILE WOUND PEDirect burial Closed Profile Wound PE pipe may be used for main line sewers provided the productis on the Engineer of Design’s Approved Pipe and Pipe Product Supplier’s List.F 415.8OTHER PLASTIC PIPESThe Engineer of Design continues to review and investigate plastic pipes for use as main line sewers.Any pipe listed on the updated Engineer of Design’s Approved Pipe and Pipe Product Supplier’sList may be used.

Bureau of EngineeringManual - Part FF 416SEWER DESIGN9/088/07F 416CORRUGATED STEEL PIPECorrugated steel pipe (CSP), also known as corrugated metal pipe shall not be used for sewer pipeexcept for temporary and emergency situations such as bypassing sewage around current constructionwork. Since the CSP roughness factor (n) will significantly differ from the existing sewer pipe andair line roughness factors, any design shall be checked thoroughly to ensure adequate flow capacityand continuity during construction. See Manual Part G for additional information.F 417DUCTILE IRON PIPEDuctile iron pipe (DIP) is superior in strength, resistance to electrolytic corrosion, and it isconsidered sparkproof. These qualities shall be considered when high strength sewer pipe orpressure pipe is required. DIP is primarily used for force mains but may be used for gravity sewerswhen warranted.F 420REINFORCED CONCRETE BOXGenerally, reinforced concrete box (RCB) should not be specified for large sewers since lined RCP isavailable in sizes up to 108 inch diameter. Larger sizes are available on special order. RCB sewer isusually required in treatment plant sewage conveyance systems. RCB sections are used in sewagediversion systems and in reaches having limited vertical or horizontal alignment. Precast RCBsections are available.F 421RCB ECONOMIC COMPARISONThe RCB becomes economically competitive with RCP at about 84 inch diameter for unlinedsewers; however, the City prefers the circular hydraulic section, which, because of its geometricshape provides higher minimum velocities at low flows. A cost study should be made to determinewhich conduit is more economical. Plastic plate lining construction for either pipe or box isexpensive and requires critical fabrication control that is best provided in a fabrication plant asopposed to a field construction site. The Engineer should check current construction costs with theConstruction Management Division, Estimating Group, prior to specifying an RCB. Otherconsiderations should include traffic safety, convenience and the construction period involved.When warranted, the Engineer may provide for both, RCP and RCB, as bid alternates on the sameproject. RCB shall be lined with PVC Plastic liner in the same fashion as RCP. (See F 412).

Bureau of EngineeringManual - Part FF 422SEWER DESIGN9/088/07F 422RCB DESIGN RESPONSIBILITIESIf necessary and economically feasible the Engineer shall determine the RCP hydraulicallyequivalent RCB. Part G of the Manual may be referred to for guidance in RCB size equivalence toRCP. The Engineer shall consider air line capacity in a sewer. Therefore, the RCB shall be designedas an open rectangular channel. Unlike RCP, the RCB will require detailed structural designs by theSED. Plastic liner-plate details are shown on Standard Plan S-121.

Bureau of EngineeringManual - Part FF 430SEWER DESIGN9/08F 430SEWER PIPE JOINTSAll sewer pipe and box joints shall be rootproof, gasproof and watertight. Unless otherwiseprovided for on the plans or Special Provisions, the joints shall be as per SSPWC.F 431JOINTS LISTED IN SSPWCThe SSPWC covers joints for pipes described in F 410. The “Brown Book”, Additions andAmendments to the SSPWC, specifies any restrictions contrary to SSPWC for City projects.F 431.1JOINTS FOR VCP PER SSPWCThe City allows four joints; Types D, G and Z covered in the SSPWC and the project plans.F 431.11TYPE D JOINTType D shall be used for 6” plain end VCP with maximum deflection less than 2 ½ degree.(Reference: Brownbook, 306-1.2.3)F 431.12TYPE G JOINTType G shall be used for Bell and Spigot (B&S) VCP.F 431.13TYPE Z JOINTType Z shall be used for VCP field closures and to adapt pipes of different materials or pipes havingdifferent outside diameters. It shall be applied to 4”- 12” diameter pipe only.F 431.14TYPE C JOINTType C was deleted from the SSPWC. See project plans. This joint may be used to join VCP largerthan 12 inch in size.

Bureau of EngineeringManual - Part FF 432SEWER DESIGN9/088/07F 432RCP JOINTThe Engineer shall specify a bell and spigot rubber gasketed joint which conforms to ASTM C 443for waterproof, gasproof and rootproof lined RCP sewers. The joints shall be designed to be selfcentering.F 433JOINTS IN REINFORCED CONCRETE STRUCTURESIf the Standard Plans or the SSPWC do not adequately specify the joints to be used in reinforcedconcrete structures, such as, RCB, the details must be shown on the structural plans or specified inthe project specifications.

Bureau of EngineeringManual - Part FF 440SEWER DESIGN8/07F 4409/08SEWER MAINTENANCE HOLESSewer Maintenance Holes (MH) are shown in the Standard Plan series. Unless otherwise specified,Standard Plan S-140 details basic requirements for all sewer MHs. If the Standard Plans do not provide the criteria necessary for a MH in question, special details will be required on the plans and inthe project specifications.F 441SEWER MAINTENANCE HOLE APPURTENANCESSewer MHs shall be equipped with appurtenant elements to enhance operation and maintenance aswell as safety.F 441.1SEWER MAINTENANCE HOLE STEPSThe City of Los Angeles no longer installs MH steps except in special situations. Access is by theuse of a nonferrous ladder or a cage lowered into the shaft.Projects requiring modification of a sewer MH or the raising or lowering of the maintenance holeframe and cover require the existing steps to be removed neatly.F 441.2SEWER MAINTENANCE HOLE FRAME AND COVERA minimum size 27 inch maintenance hole frame and cover (MHF&C) shall be installed on everynew sewer MH. See Standard Plan S-282. The size (MHF&C) shall vary with the maximum pipesize connected to the MH as indicated in Standard Plan S-140. (See Table F 462.)A 36 inch MHF&C as shown in Standard Plan S-286 may be used to provide a large access coverwhen necessary for maintenance (e.g. very shallow MHs). The Bureau of Sanitation shall beconsulted on the intended use of this size cover.

Bureau of EngineeringManual - Part FSEWER DESIGN9/088/07F 441.2Pressure MHF&C Standard Plan S-284 shall be required when the hydraulic grade line of the sewermay rise to within 1 foot of the top of the maintenance hole. This MHF&C shall be fitted with apressure maintenance hole collar as shown in Standard Plan S-285.Certain MHs in the City are designated for use as discharge sites for disposing sewage collectedduring sewer repairs and from the cleaning and pumping of septic tanks. These MHs shall be fittedwith a MH cover which has a removable 5 inch diameter "Inspection Cover" as shown in StandardPlan S-151. The installation and location of this type of cover require the concurrence of the Bureauof Sanitation.F 441.3SEWER MAINTENANCE HOLE INNER COVERSMH inner covers as shown in Standard Plan S-155 or S-156 may be installed when sewer gases canescape into the atmosphere or to reduce inflow when subject to flooding. These covers may also beused to prevent surface water inflow.F 441.4SEWER MAINTENANCE HOLE DISCSewer MH Discs Standard Plan S-157 may be installed on sewer MHF&Cs to prevent dirt andrubbish from falling through the MHF&C.F 441.5OTHER APPURTENANCESOther appurtenances may be required in special conditions. Some are required for special structures.See the sections/subsections pertaining to those special structures. Other hardware may be speciallydesigned and shown on the plans for a particular project.F 441.6OUTDATED APPURTENANCESThe City of Los Angeles no longer installs Flush Tanks. Projects rehabilitating sewers shouldremove flush tank mechanism from adjacent MH and remodel the MH base if necessary to providemaintenance access.F 442BRICK MAINTENANCE HOLEBrick MHs as shown in Standard Plan S-141 may be specified as the standard sewer MH. The City

Bureau of EngineeringManual - Part FSEWER DESIGN9/088/07F 442of Los Angeles now uses lined or coated precast concrete MHs readily available from local makers.F 443PRECAST CONCRETECOATINGSMAINTENANCEHOLEANDThe precast concrete MH as shown in Standard Plan S-142 should be used. These MHs shall belined on the interior surfaces with a plastic or an approved protective coating. The standard

F 480 HOUSE CONNECTIONS August-07 F 481 TYPES OF SEWER HOUSE CONNECTIONS " F 481.1 ASSESSMENT ACT HOUSE CONNECTIONS " F 481.2 CASH CONTRACT HOUSE CONNECTIONS " F 481.3 CLASS "B" PERMIT PROJECT HOUSE CONNECTIONS " . plastic pipes, brick arches, clay tile -lined reinforced concrete pi

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