Public Works Standards Design Standards | Standard Specifications | Standard Details Public Works Standards Design Standards Standard Specifications Standard Details January 1, 2019 Revised: January 1, 2020 and March 29, 2021 DEPARTMENT OF ENVIRONMENTAL SERVICES CITY OF GRESHAM, OREGON Approved: Steve Fancher Director City of Gresham Department of Environmental Services 1333 NW Eastman Parkway Gresham, Oregon 97030-3813 503-618-2525 Fax 503-661-5927 www.greshamoregon.gov PUBLIC WORKS STANDARDS ORDER FORM Name Title Organization Department Address City State Zip Code Phone Number Fax Number E-mail Address Copies Item Unit Price (Each) Total Public Works Standards Document $75.00 Public Works Standards on CD $25.00 Grand Total: Send order to: City of Gresham, Department of Environmental Services 1333 NW Eastman Parkway, Gresham, OR 97030-3813 DESIGN STANDARDS TABLE OF CONTENTS CHAPTER 1 - GENERAL DESIGN 1.01 Authority and Purpose ............................................................................................................ 1 1.02 Definitions ................................................................................................................................ 1 1.03 Engineering Policy .................................................................................................................. 6 1.04 Applicability ............................................................................................................................. 6 1.05 Standard Specifications .......................................................................................................... 6 1.06 Approval of Alternate Materials or Methods ......................................................................... 6 1.07 Special Design Problems ........................................................................................................ 6 1.08 Revisions to Public Works Standards ................................................................................... 7 CHAPTER 2 - GENERAL TECHNICAL DESIGN 2.01 Construction Plan General Information ................................................................................ 1 2.02 CAD Drafting Standards ......................................................................................................... 1 2.03 Existing City As-Built Plans ................................................................................................... 1 2.04 Supporting Information ........................................................................................................... 1 2.04.01 Geotechnical Report ............................................................................................................. 1 2.04.02 Stormwater Report ................................................................................................................ 1 2.04.03 Stormwater Facility Operations and Maintenance Plan ........................................................ 2 2.05 Plan Submittal .......................................................................................................................... 2 2.06 As-Built Plan Requirements ................................................................................................... 2 2.07 Easements ................................................................................................................................ 2 2.07.01 General Utility Easements (GUE) ......................................................................................... 2 2.07.02 Public Utility Easements ........................................................................................................ 2 2.08 Depths of Bury for Pipes ........................................................................................................ 4 2.09 Private Utilities in Rights-of-Way ........................................................................................... 4 2.09.01 Private Utilities on City-owned Poles .................................................................................... 6 CHAPTER 3 - WASTEWATER SYSTEM DESIGN 3.01 General Design Requirements ............................................................................................... 1 3.02 Minimum Design Criteria ........................................................................................................ 1 3.03 Alignment and Cover .............................................................................................................. 3 3.03.01 Right-of-way Location ........................................................................................................... 4 3.03.02 Minimum Depth ..................................................................................................................... 4 3.03.03 Maximum Depth .................................................................................................................... 4 3.03.04 Easements ............................................................................................................................ 4 3.03.05 Separation with Utilities ......................................................................................................... 4 3.03.06 Relation to Watercourses ...................................................................................................... 4 3.04 Pipe Materials and Size ........................................................................................................... 5 3.05 Structures ................................................................................................................................. 5 3.05.01 Access ................................................................................................................................... 5 3.05.02 Manholes ............................................................................................................................... 5 3.05.03 Cleanouts .............................................................................................................................. 6 3.06 Sanitary Sewer Laterals .......................................................................................................... 6 3.07 Connection to Existing Sewers .............................................................................................. 7 3.08 Private Sewer Lines ................................................................................................................. 7 3.09 Subsurface Disposal ............................................................................................................... 7 3.10 Wastewater Pump Station Design Standards ....................................................................... 8 3.10.01 General .................................................................................................................................. 8 3.10.02 Design ................................................................................................................................... 8 3.10.03 Key Components ................................................................................................................... 8 CHAPTER 4 - STORMWATER DRAINAGE SYSTEM DESIGN 4.01 General Design Requirements ............................................................................................... 1 4.02 Minimum Design Criteria ........................................................................................................ 2 4.03 Alignment and Cover .............................................................................................................. 2 4.03.01 Right-of-way Location ........................................................................................................... 2 4.03.02 Minimum Depth ..................................................................................................................... 2 4.03.03 Maximum Depth .................................................................................................................... 3 4.03.04 Easements ............................................................................................................................ 3 4.03.05 Relation to Watercourses ...................................................................................................... 3 4.03.06 Outfalls on Slopes ................................................................................................................. 3 4.04 Pipe Materials and Size ........................................................................................................... 3 4.05 Structures ................................................................................................................................. 4 4.05.01 Access ................................................................................................................................... 4 4.05.02 Manholes ............................................................................................................................... 4 4.05.03 Cleanouts .............................................................................................................................. 4 4.05.04 Stormwater Inlets .................................................................................................................. 5 4.05.05 Outfall Protection ................................................................................................................... 5 4.06 Culverts ...................................................................................................................................