Unit III - Sanitary Sewer Design Standards - City of Fort Wayne

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Water Resources Development Criteria/Standards Manual Chapter 4UNIT III - Sanitary Sewer Design StandardsBuilding Sewers4.6 Hydraulic Design Criteria4.6.1 Plumbing CodesBuilding sewers shall conform to the latest adopted version of the Uniform PlumbingCode. As an alternative to plumbing codes, an engineer licensed in the state of Indianamay design a building sewer.4.6.2 Minimum SlopesBuilding sewers shall be laid on a minimum slope of 2.08% (1/4” per foot). Anyexception to this must be approved by Water Resources.4.7 Building Sewer Connection to Public SewerThe building sewer shall connect to the public sewer at a mainline fitting. The building sewershall not protrude into the main line.Connections to manholes must receive prior approval from Water Resources. Inside dropconnections to the manhole will not be permitted. When connections are made to manholestructures, rubber water stop joints or mortared rubber gaskets (boots) poured in place shall bespecified for water tightness between the pipe and the manhole. When new holes into manholesare required, core drilling of the new hole shall be specified.Building sewer installed for future connections shall be terminated at the street right-of- way oreasement and shall be properly plugged with a manufactured plug to ensure a watertight seal. Aone-half inch ferrous locator rod or a magnetic locator tape shall be installed at the plugged lineto within one foot (1’) of the finished grade.4.8 Building Sewer Structures4.8.1 CleanoutsA cleanout shall be provided adjacent to all building structures. The maximum distancebetween the exterior building wall and the cleanout wye shall be seven feet (7’).4.8.2 Grease and Sand TrapsAny building sewer which will have or has the potential of discharging waste containinggrease, oil, sand, or similar substances, having quantity and characteristics above that of anormal single family residence waste, shall have a grease and/or sand trap installed in amanner to provide, at all times, the effective removal of grease, oil, sand, and/or similarsubstances before discharge to the public sewer.Installation of a grease and/or sand trap will be required within a building sewer whenany one of the following conditions exist:• Abnormal maintenance of the sewer has been required to prevent the occurrence ofblockages, back-ups, etc., resulting in property damage; and evidence indicates thatCreated: January 1, 2002 III - 4 - 4 City of Fort WayneRevised:
Water Resources Development Criteria/Standards Manual Chapter 4UNIT III - Sanitary Sewer Design StandardsBuilding Sewersthe cause of this abnormal maintenance is the result of the discharge of prohibitedwastes and/or wastes in excess of limitations set out in the Fort Wayne MunicipalCode.• There exists a concentration of persons discharging prohibited wastes into a publicsewer without the benefit of any grease and/or sand trap.• The results of laboratory analysis have demonstrated that the strength of wastesbeing discharged into the public sewer are in excess of the limitations set out by theFort Wayne Municipal Code.Water Resources will notify, in writing, any person who has been identified to be inviolation of any of the above-mentioned conditions and shall require such person orpersons to install a grease and/or sand trap. The grease and/or sand trap must be installedwithin one hundred and twenty (120) days of written notification. Sole responsibility andcost of installation shall lie with the property owner or utility user.4.8.3 Inspection Manholes4.9 Building Sewer PipeWhen required by Water Resources, an inspection manhole shall be included in thebuilding sewer design. Inspection manholes will be considered on a case-by-case basis.a. The minimum allowable inside diameter for building sewers shall be six inches (6”).Commercial and industrial connections shall be discussed on a case-by-case basis.b. Pipe materials shall be in accordance with Water Resource standards.c. Pipe testing and bedding requirements shall be in accordance with Water Resourcesstandards unless special circumstances warrant otherwise. Exceptions may be approvedby Water Resources.d. Backfill classifications, materials, and methods of compaction shall be in accordance withWater Resource standards unless special circumstances warrant otherwise. Exceptionsmay be approved by Water Resources.e. All sewers shall be designed to prevent damage from applied loads both during and afterconstruction. Load allowance shall be based upon trench width and depth. In instancesin which standard strength pipe is not sufficient, extra strength pipe or specialconstruction methods shall be specified. All loading requirements must be taken intoaccount when considering material selection and installation methods.END CHAPTER 4Created: January 1, 2002 III - 4 - 5 City of Fort WayneRevised:
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Unit III - Sanitary Sewer Design Standards - City of Fort Wayne

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