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Chapter 1 - General Design Requirements  
1.00 Requirements for Public Improvements
1
1.01 Precedence of Documents 1
1.02 Abbreviations and Definitions
1.03 Permits
1.04 Submittal Requirements 8
1.05 Professional Qualifications 39
1.06 Changes to these Engineering Standards 39
1.07 Design Modification Process 39
1.08 Securities 40
1.09 Errors and Omissions 40
1.10 Inspection 40
1.11 Contractor's Responsibility for Scheduling 42
1.12 Contractor's Requirements for Testing 43
1.13 Safety Requirements 44
1.14 Preservation, Restoration, and Cleanup 44
1.15 Railroad Crossing 46
1.16 Penalties 46
   
Chapter 2 - Erosion Control, Clearing, and Grading Top
 
2.00 Purpose & Objective 1
 
2.01 Applicability 2
 
2.02 General Requirements 4
 
2.03 Seasonal Work Limitations 5
2.04 Twelve Elements of Construction Erosion and Sediment Control 6
2.05 Erosivity Waiver 13
2.06 Underground Utility Construction 13
2.07 Historical and Archaeological Areas 14
 
2.08 Other Requirements 14
 
2.09 Standard Notes for Erosion Control Plans 14
2.10 Signage 16
2.11 Common Erosion and Sediment Control BMPs 18
Figures  
Figure 2-1: Erosion Control Signage  17
 
   
Chapter 3 - Streets
Top
3.00 Functional Classification 1
 
3.01 Access 2
 
3.02 Intersections, Driveways and Approaches 4
3.03 Street Widths 10
 
3.04 Surfacing Requirements 16
3.05 Design Speed 17
3.06 Horizontal Alignment 18
3.07 Vertical Alignment 18
 
3.08 Transitions 19
 
3.09 Dedications and Guarantees 20
3.10 Private Streets 21
3.11 Street Frontage Improvements 25
3.12 Street Ends 28
3.13 Medians 31
 
3.14 Sight Obstruction Requirements 31
 
3.15 Survey Monuments 32
 
3.16 Sidewalks 32
3.17 Multi-Use Trails 32
 
3.18 Bridges 33
3.19 Landscaping in the Right-of-Way, Easements, and Access Tracts 34
3.20 Street Illumination 36
3.21 Traffic Control and Signing 37
3.22 Appurtenances 39
3.23 Franchise Utilities 39
3.24 Trench Backfill and Restoration 40
3.25 Speed Humps 40
Figures Top
Figure 3-1: Corner Lot Setback
 
7
 
Figure 3-2: Major Arterial 11
Figure 3-3: Minor Arterial 12
Figure 3-3a: Industrial Minor Arterial 12
Figure 3-4: Collector 12
 
Figure 3-4a: Industrial Collector 13
Figure 3-4b: Industrial Collector w/Ditch 13
Figure 3-5: Local: Multi-Family Area 14
Figure 3-6: Local: Single-Family Area 14
Figure 3-6a: Roadway with Rain Gardens 15
Figure 3-7: Alley: Commercial & Industrial 15
Figure 3-8: Alley: Residential 16
Figure 3-9: Private Street Type I 23
Figure 3-10: Private Street Type II 23
Figure 3-11: Private Street Type III 24
 
Figure 3-12: Minimum Street Improvement 27
 
Figure 3-13: Cul-De-Sac Dimensions 29
Figure 3-14: Temporary Cul-De-Sac 30
Figure 3-15: Trench Patch 40
Tables Top
Table 3.1 - Unsignalized Intersection Spacing 6
 
Table 3.2 - Minimum Distances from Corner Standards 7
Table 3.3 - Curb Return Radii (Feet) Edge of Pavement/Curb-Minimums 10
 
Table 3.4 - Major Arterial Surfacing Requirements 16
Table 3.5 - Minor Arterial Surfacing Requirements 17
Table 3.6 - Collector Street Surfacing Requirements 17
Table 3.7 - Local Street and Alley Access Surfacing Requirements 17
Table 3.8 - Vertical Alignments and Flood Plains 19
Table 3.9 - Landscaping in the Right-of-Way, Easement, and Access Tracts 35
   
Chapter 4 - Storm Draining Top
4.00 Purpose 1
 
4.01 General 1
4.02 Scope 2
4.03 Exemptions and Variations 3
4.04 Overview of Development Requirements 6
4.05 Local Requirements for Development and Redevelopment 6
4.06 State Requirements for Development and Redevelopment 13
4.07 Local Impact Development 14
4.08 Standards for Dispersion and Infiltration 15
4.09 Local Credits 17
4.10 State Credits 19
4.11 Simplified Infiltration Test 19
4.12 General Conveyance Requirements 20
4.13 Closed Conduit Systems 20
4.14 Open Conveyance 23
4.15 Private Drainage 24
4.16 Subsurface Drainage 25
4.17 Curb Cuts and Perforated Connections 25
4.18 Tracts and Easements 26
4.19 Stormwater Performance Bond 26
4.20 As-Built Plans 27
4.21 Dedication of Facilities 27
4.22 Long-Term Operation and Maintenance 28
4.23 Enforcement 30
Chapter 5 - Water Top
5.00 Utility Easements and Tracts 1
 
5.01 General Design Considerations 1
 
5.02 Sizing and Pressure Requirements 3
5.03 Shut-off Valves 4
5.04 Air-Release Valves 4
5.05 Hydrants 4
5.06 Water Meters 4
5.07 Fees and Charges 6
5.08 Cross Connection Control 6
5.09 Contract for Reimbursement (Latecomer Agreements) 6
5.10 Water Quality 6
5.11 Plans and Specifications 6
5.12 Connections to Existing Pipelines 7
5.13 Roadway and Railway Crossing 7
5.14 Trench Excavation 8
5.15 Pipe in Filled Areas 8
5.16 Pipe Installation for Water Mains 8
5.17 Bedding and Backfill 9
5.18 Hydrostatic Tes 9
5.19 Sterilization and Flushing of Water Mains 10
5.20 Cross Connection Control and Backflow Assemblies  10
5.21 Requirements for Water System Vault Installations 12
5.22 Fire Services and Domestic Services 13
5.23 Special for Fire Service Only 13
5.24 Water Meter Vaults 14
5.25 Pressure Reducing Valve Vaults 14
5.26 Appurtenances 14
Tables Top 
Table 5.1 - Maximum Deflection Permitted 18-Foot Length Rope 9
 
   
Chapter 6 - Wastewater Top
6.00 Extension of the Sewer System and Service 1
 
6.01 Plans and Specifications 5
6.02 Connections to Existing Systems 5
6.03 Roadway and Railway Crossing 6
6.04 Trench Excavation 6
6.05 Pipe Laying 6
6.06 Pipe Bedding 6
6.07 Pipe Backfilling 6
6.08 Pipe in Filled Areas 7
6.09 Cleaning and Flushing 7
6.10 Testing of Gravity Sewers 7
6.11 Testing of Manholes 7
6.12 Television Inspection 7
6.13 Testing of Pressure Sewer Mains 7
6.14 Manholes 8
6.15 Side Sewers 9
6.16 Pump Stations 10
 
6.17 Mechanical Lifting Devices 11
6.18 Pretreatment Facilities 12
Figures  

Figure 6-1: Manhole Sizing

 
Appendix A - Procedure for Permit Projects by Private Contract Top

Appendix B - Longview-Kelso Urban Area Access Management for Roads and Streets

Appendix C - Table 4.1 - Summary of Most Common State Flow and Quality Control Credits in Ecology's SMMWW
Appendix D - Local and State Requirements Flowcharts
Appendix E - Design Storm Data
Appendix F - Common Onsite Runoff Management BMPs
Appendix G - Open Pit Fallling Head Infiltration Test
Appenidix H - Example Maintenance Agreement and Restrictive Covenant

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