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Design Standards Manual

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Design Standards Manual Design Standards Manual February 2014 TABLE OF CONTENTS SECTION 1 GENERAL ...................................................................................................... 1 1.0 Authority and Purpose .................................................................................... 1 1.1 Engineering Policy ......................................................................................... 1 1.2 Standard Specifications and Standard Drawings ........................................... 2 1.3 Revisions to Design Standards ...................................................................... 2 1.4 Definitions ...................................................................................................... 2 1.5 Construction Plans ....................................................................................... 12 1.6 Plan Submittal .............................................................................................. 15 1.7 As-built Plan Requirements .......................................................................... 16 1.8 Approval of Alternate Materials, Methods, or Design ................................... 18 SECTION 2 WASTEWATER ............................................................................................ 21 2.0 General Design Requirements ..................................................................... 21 2.1 Pipe Materials and Size ............................................................................... 21 2.2 Minimum Design Criteria .............................................................................. 22 2.3 Alignment and Cover .................................................................................... 22 2.4 Manholes ..................................................................................................... 23 2.5 Cleanouts ..................................................................................................... 25 2.6 Service Lateral ............................................................................................. 25 2.7 Connection to Existing Sewers ..................................................................... 26 SECTION 3 WATER SYSTEMS ....................................................................................... 28 3.0 General Design Requirements .................................................................... 28 3.1 Pipe Materials and Size ............................................................................... 28 3.3 Appurtenances ............................................................................................. 32 3.3 Railroad or Highway Crossings .................................................................... 34 3.4 Water Service Lines ..................................................................................... 34 3.5 Fire Service .................................................................................................. 34 3.6 Backflow Prevention ..................................................................................... 35 3.7 System Testing ............................................................................................ 35 SECTION 4 STORM DRAINAGE ...................................................................................... 36 4.0 General Design Requirements ..................................................................... 36 4.1 Pipe Materials and Size ............................................................................... 37 4.2 Alignment, Location and Cover .................................................................... 38 4.3 Structures ..................................................................................................... 38 4.4 Drainage Report ........................................................................................... 39 4.5 Flow Determination ...................................................................................... 40 4.6 Conveyance Design ..................................................................................... 44 4.7 Water Quantity and Quality Facilities ........................................................... 46 4.7.1 General Requirements ............................................................................. 46 4.8 Low Impact Development Approaches (LIDA) ............................................. 55 SECTION 5 STREETS ...................................................................................................... 58 5.0 General Design Requirements ..................................................................... 58 5.1 Traffic Analysis ............................................................................................. 58 5.2 Intersections ................................................................................................. 60 5.3 Half Street Construction ............................................................................... 61 5.4 Street Classification ..................................................................................... 61 5.5 Design Speed ............................................................................................... 62 5.6 Horizontal/Vertical Curves and Grades ........................................................ 62 5.7 Pavement Design ......................................................................................... 63 5.8 Concrete Curb ............................................................................................. 63 5.9 Parking ......................................................................................................... 64 5.10 Sidewalks ..................................................................................................... 64 5.11 Bikeways ..................................................................................................... 64 5.12 Driveways .................................................................................................... 65 5.13 Street Lighting, Trees, Names and Signage ................................................ 67 5.14 Permanent Dead-end Streets ...................................................................... 68 5.15 Alleyways and Private Residential Streets/Access ways ............................. 69 5.16 Local Street Design for Adverse Topography .............................................. 69 5.17 Five Year Moratorium Street Cut Replacement Guidelines .......................... 70 5.18 Trench Restoration Requirement ................................................................. 70 5.19 Intersection Sight Distance .......................................................................... 70 APPENDIX A………………………………………………………………………………….....73 STANDARD DRAWINGS…………………………………………………………………........96 SECTION 1 GENERAL 1.0 Authority and Purpose The purpose of these Design Standards is to provide a consistent policy under which certain physical aspects of public facility design will be implemented. Most of the elements contained in this document are Public Works oriented and it is intended that they apply to both public improvements under City contract and public improvements under private contract designated herein. These Design Standards cannot provide for all situations. They are intended to assist but not to substitute for competent work by design professionals. It is expected that engineers will bring to each project the best of skills from their respective disciplines. The Design Standards are also not intended to limit unreasonably any innovative or creative effort which could result in better quality, better cost savings, or both. Any proposed departure from the Design Standards will be judged on the likelihood that such departure will produce a compensating or comparable result in every way adequate for the user and City resident. 1.1 Engineering Policy General: It shall be the policy of the City of Newberg to require compliance with Oregon Revised Statute 672 for professional engineers. All engineering plans, reports, or documents shall be prepared by a registered professional engineer, or by a subordinate employee under the engineer's direction, and shall be signed by the engineer and wet stamped with the engineer's seal to indicate the engineer's responsibility for them. It shall be the engineer's responsibility to review with the City any proposed public facility extension, modification, or other change prior to any proposed design work to determine any special requirements or to determine whether the proposal is permissible. A "Preliminary Review" and/or a "Plans Approved for Construction" stamp of the City on the plans for any job does not in any way relieve the engineer of responsibility to meet all requirements of the City or obligation to protect life, health, and property of the public. The plan for any project shall be revised or supplemented at any time it is determined that the full requirements of the City have not been met. Public works permit application(s) for public street, storm drainage, waterworks, and/ or wastewater improvements shall be approved/ issued by the City before commencement of any onsite building, grading, or construction activities. Contractor Qualifications: All contractors performing work in the Public Right of Way and/ or on City owned infrastructure shall be pre-approved with the City of Newberg, and shall apply and possess a current City Business License. Upon the City Engineer’s request, contractors shall provide supporting 2014 City of Newberg Design Standards Manual Page 1 documents
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