Specifications and Standards

347 Pages·2017·6.87 MB·English

Department of Public Works

Specifications and Standards
Amended April 2017

Adopted January, 2010 Town of Colchester, Vermont

A Community of People, Business, Industry and
Resources working for a better Town

www.colchestervt.gov
COLCHESTER PUBLIC WORKS SPECIFICATIONS AND STANDARDS

PREFACE

The “Town of Colchester Public Works Specifications and Standards” are applicable to all
new construction and reconstruction of infrastructure due to obsolescence or deterioration.
Variations from these standards and specifications will not be permitted except as provided
for herein. In cases where the design of a facility is not governed by these standards and
specifications, the latest design methods shall be used and included on the plans for
acceptance by Town Officials. All engineering design shall be based on the latest methods
and technology when determining sizes, strengths, and amounts. All plans and
specifications shall have the following note stating, “All work shall be performed in
accordance with the Town of Colchester Public Works Specifications and Standards”.

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COLCHESTER PUBLIC WORKS SPECIFICATIONS AND STANDARDS

TABLE OF CONTENTS

Section 1. GENERAL PROVISIONS 12

1.1 GENERAL 12
1.2 BASIC DESIGN STANDARDS 12
A. SUBDIVISIONS 13
B. STREET NUMBERS 13
C. STREET GEOMETRIC STANDARDS 14
D. STORMWATER BASIS OF DESIGN 18
E. ROADWAY BASIS OF DESIGN 19
1.3 ENGINEERING PLANS 19
1.4 DEVELOPMENT TRAFFIC STUDIES 19
1.5 PROTECTION OF WORK PERSONNEL AND THE PUBLIC 21
1.6 PROTECTION AND REPAIR OF EXISTING UTILITIES 21
1.7 RECONSTRUCTION OF EXISTING UTILITIES 22
1.8 PERMITS 22
1.9 WORK OUTSIDE OWNED PROPERTY LIMITS OR WITHIN
PUBLIC RIGHTS OF WAY 22
1.10 SUPERVISORS ON THE JOB SITE 22
1.11 MAINTENANCE AND PROTECTION OF TRAFFIC 23
1.12 TESTING AND INSPECTION REQUIREMENTS 24
A. GENERAL 24
B. ROAD INSPECTION SCHEDULE 25
C. UTILITY SYSTEMS 26
1.13 SUBMITTAL OF RECORD DRAWINGS 27
A. GENERAL 27
1.14 TRAFFIC AND ENGINEERING STUDY (SPEED STUDY) 29
1.15 OTHER MISCELLANEOUS REQUIREMENTS 30
A. STUMP DISPOSAL 30
1.16 OTHER REFERENCED STANDARDS 30
Section 2. EARTHWORK SPECIFICATIONS 32

2.1 GENERAL 32
2.2 EXCAVATION, BACKFILLING, AND COMPACTING 32
A. DESCRIPTION 32
B. QUALITY ASSURANCE 32
C. PRODUCTS 32
D. EXECUTION 33
2.3 TRENCHING, BACKFILLING, AND COMPACTING 37
A. DESCRIPTION 37
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B. QUALITY ASSURANCE 37
C. PRODUCTS 37
D. EXECUTION 38
2.4 CONTROLLED BLASTING, EARTH AND ROCK EXCAVATION 42
A. DESCRIPTION OF WORK 42
B. DEFINITIONS 43
C. QUALITY ASSURANCE 44
D. BLASTING LIMIT CRITERIA 45
E. SUBMITTALS 46
F. JOB CONDITIONS 48
G. SAFETY PRECAUTIONS 49
H. MONITORING PROCEDURE 49
Section 3. ROADWAY SPECIFICATIONS 51

3.1 GENERAL 51
3.2 SOIL TESTING 51
3.3 SUBGRADE 51
3.4 DRAINAGE GEOTEXTILES 53
A. DESCRIPTION 53
B. MATERIALS 53
C. CONSTRUCTION REQUIREMENTS/INSTALLATION 53
3.5 STONE FILL OR RIPRAP CONTROL GEOTEXTILES 54
A. DESCRIPTION 54
B. MATERIALS 55
C. CONSTRUCTION REQUIREMENTS/INSTALLATION 55
3.6 SUBGRADE GEOTEXTILES 57
A. DESCRIPTION 57
B. MATERIALS 57
C. CONSTRUCTION REQUIREMENTS/INSTALLATION 57
3.7 UNDERDRAINS 60
A. DESCRIPTION 60
B. MATERIALS 60
C. CONSTRUCTION METHODS 60
3.8 SAND 61
A. DESCRIPTION 61
B. MATERIALS 61
3.9 GRAVEL BASE - BOTTOM COURSE 62
A. DESCRIPTION 62
B. MATERIALS 62
C. PREPARATION OF SUBBASE 62
3.10 GRAVEL BASE - TOP COURSE 63
A. DESCRIPTION 63
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B. MATERIALS 63
3.11 BITUMINOUS CONCRETE (ASPHALT) PAVEMENT 64
A. GENERAL 64
B. PRODUCTS 65
C. WORK 68
3.12 PAINTED PAVEMENT MARKINGS 72
A. DESCRIPTION 72
B. MATERIALS 72
C. CONSTRUCTION METHODS 72
3.13 CEMENT CONCRETE CURB 73
A. DESCRIPTION 73
B. MATERIALS 73
C. CONSTRUCTION METHODS 73
3.14 CEMENT CONCRETE SIDEWALK 74
A. DESCRIPTION 74
B. MATERIALS 74
C. CONSTRUCTION METHODS 75
3.15 TRAFFIC CONTROL DEVICES 76
3.16 STREET LIGHTING 77
3.17 PLANTING OF TREES 83
3.18 STREET GUARD RAIL OR BARRIER 83
3.19 STREET SIDELINE MONUMENTS 84
A. DESCRIPTION 84
B. MATERIALS 84
C. CONSTRUCTION METHODS 84
Section 4. STORM DRAINAGE SPECIFICATIONS 85

4.1 GENERAL 85
4.2 PROJECT REQUIREMENTS 85
A. COMPLIANCE 85
B. STORMWATER MANAGEMENT PLAN 85
4.3 STANDARD TREATMENT PRACTICES 85
A. COMPLIANCE 85
B. ANALYSIS AND SIZING 85
4.4 MATERIALS AND PRODUCTS 86
A. TYPES OF PIPE 86
B. MANHOLES 87
C. CATCH BASINS 87
D. DRAINAGE SWALES 88
E. UNDERDRAINS 88
4.5 CONSTRUCTION METHODS 89
A. LAYING PIPE 89
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B. PIPE BEDDING 89
C. BACKFILL 89
D. HEADWALLS 90
E. PIPE OUTFALLS 91
F. CATCH BASINS 91
G. ACCESS ROAD 91
H. CHAIN LINK FENCE 91
Section 5. WATER DISTRIBUTION SPECIFICATIONS 93

5.1 GENERAL 93
5.2 WATER DISTRIBUTION STANDARDS 93
Section 6. SANITARY SEWER SPECIFICATIONS 97

6.1 GENERAL 97
6.2 MATERIALS 97
A. TYPES OF PIPE 97
B. PVC SEWER PIPE 97
C. DUCTILE IRON PIPE 98
D. POLYETHYLENE ENCASEMENT FOR DUCTILE IRON PIPE 99
E. MANHOLES 99
F. MASONRY 102
6.3 CONSTRUCTION METHODS 103
A. EXCAVATION 103
B. LAYING SEWER PIPE 103
C. PIPE BEDDING 103
D. BACKFILL 103
E. CONCRETE CRADLE AND ENCASEMENT FOR PIPE 104
F. FROST PROTECTION FOR SHALLOW SEWERS 104
G. MANHOLE EXCAVATION AND SUBBASE 105
H. MANHOLE CONSTRUCTION 105
I. MASONRY 105
J. DEFLECTION TESTING FOR GRAVITY SEWERS 105
K. LEAKAGE TESTS AND ALLOWANCES FOR GRAVITY SEWERS 106
L. MANHOLE LEAKAGE TESTING 107
M. LEAKAGE AND PRESSURE TESTING FOR FORCE MAIN 110
N. CLEANING PIPELINES AND APPURTENANCES 110
O. SEWER SERVICE CONNECTIONS 110
P. CLEANOUTS FOR SEWERS 111
Q. CHIMNEYS 112
R. THRUST BLOCKS AND ANCHORS 112
S. AIR RELEASE VALVES AND MANHOLES 112
Section 7. WASTEWATER PUMPING STATIONS

SPECIFICATIONS 112

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7.1 GENERAL 112
7.2 PROJECT REQUIREMENTS 112
7.3 FACTORY BUILT WASTEWATER PUMPING STATIONS 114
A. GENERAL 114
B. FOUNDATION 115
C. WET WELLS 115
D. ENCLOSURE 116
E. SEWAGE PUMPS 117
F. VACUUM PRIMING SYSTEM 118
G. INTERIOR PIPING 119
H. VALVES 119
I. EMERGENCY STORAGE AND PUMPING REQUIREMENTS 120
J. EMERGENCY BACK-UP MEASURE 121
K. CONTROLS 122
L. WIRING 122
M. ACCESSORY EQUIPMENT 123
N. SPARE PARTS 124
7.4 FACTORY TESTS 124
7.5 SERVICES OF MANUFACTURERS REPRESENTATIVE 125
7.6 Pump - FIELD TESTING 125
7.7 OPERATING INSTRUCTIONS 125
7.8 REMOTE ACCESS AND Pump control system 126
7.9 ALARM TELEMETRY SYSTEM 127
7.10 level transmitter 128
7.11 ELECTRICAL SYSTEM 128
Section 8. EROSION, SEDIMENT AND DUST CONTROL

130

8.1 GENERAL 130
8.2 PROJECT REQUIREMENTS 130
A. COMPLIANCE WITH LOCAL & STATE REGULATIONS 130
B. EROSION PREVENTION & SEDIMENT CONTROL PLAN 130
C. DUST CONTROL 130
D. PROTECTION OF WATER COURSES 131
E. LIMIT DISTURBANCE AREA AND/OR TIME OF EXPOSURE 131
F. INSPECTIONS and maintenance 131
8.3 MATERIALS, PRODUCTS & BMPS 131
A. PERIMETER FENCE 132
B. STABILIZED CONSTRUCTION ENTRANCES 132
C. MULCH 132
D. EROSION CONTROL BLANKETS 132
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E. STONE CHECK DAMS 132
F. SILT FENCE 133
G. INLET PROTECTION 133
H. POLLUTION PREVENTION 134
8.4 METHODS FOR INSTALLATION & EXECUTION 134
A. PERIMETER FENCE 134
B. STABILIZED CONSTRUCTION ENTRANCES 134
C. MULCH 134
D. EROSION CONTROL BLANKETS 135
E. STONE CHECK DAMS 135
F. SILT FENCE 135
G. INLET PROTECTION 135
H. POLLUTION PREVENTION 135
I. PERMANENT STABILIZATION 136
J. REMOVAL OF TEMPORARY CONTROLS 136
Section 9. LANDSCAPING & PERMANENT EROSION

CONTROLS 137

9.1 GENERAL 137
9.2 PROJECT REQUIREMENTS 137
A. PERMANENT STABILIZATION OF DISTURBED AREAS 137
B. DELIVERY, STORAGE, AND HANDLING 137
9.3 MATERIALS 138
A. SEEDING REQUIREMENTS 138
B. TREES, SHRUBS, AND BUSHES 138
C. TOPSOIL 139
D. SOIL AMENDMENT MATERIALS 139
E. MULCH MATERIALS 140
F. ENVIRONMENTAL REQUIREMENTS 140
9.4 METHODS 140
A. PREPARATION OF SUBSOIL 140
B. PLACING TOPSOIL 140
C. FERTILIZING 141
D. SEEDING 141
E. HYDROSEEDING 141
F. SEED PROTECTION 142
G. PLANTING 142
H. PLANT RELOCATION AND RE-PLANTING 143
I. PLANT SUPPORT 143
J. TREE PRUNING 143
9.5 QUALITY CONTROL 143
9.6 MAINTENANCE 143

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APPENDIX A: CHAMPLAIN WATER DISTRICT STANDARDS

APPENDIX B: TYPICAL ROADWAY CROSS-SECTIONS

APPENDIX C: SUPPORTING FIGURES

APPENDIX D: COLCHESTER STREET TREE MASTER PLAN

APPENDIX E: PROJECT CERTIFICATION FORM

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FIGURE NO. LIST OF ILLUSTRATIONS

SECTION 3 STREET DETAILS
3.1 Typical Roadway Cross-Section with Closed Drainage
3.2 Typical Roadway Cross-Section with Standard Open Drainage
3.3 Typical Roadway Cross-Section with Shallow Swale Open
Drainage
3.4 Typical Unpaved Roadway Cross-Section
3.5 “Y” Turn Around
3.6 “L” Turn Around
3.7 Concrete Sidewalk
3.8 Typical Tapered Curb/Concrete Curb
3.9 Driveway Entrance On Curbed Street
3.10 Driveway Entrance On Uncurbed Street
3.11 Street/Driveway Offset Distances
3.12 Curbed Street Intersection with Existing Uncurbed Street
3.13 Sight Distance Chart
3.14 Replacement of Existing Bituminous Pavement
3.15 Sidewalk Ramps
3.16 Sidewalk Ramps and Median Islands
3.17 Bituminous Concrete Multi-Use Path
3.18 Crosswalk

SECTION 4 STORM DETAILS
4.1 Precast Catch Basin For Shallow Swale Open Drainage
4.2 Precast Catch Basin w/ Underdrain and/or Curb
4.3 Typical Storm Sewer Trench
4.4 Storm Outfall
4.5 Typical Drainage Swale
4.6 Typical Stone Lined Ditch
4.7 Stormwater Pond Access Road
4.8 Chain Link Fence and Double Gate Detail

SECTION 5 WATER DETAILS
5.1 Concrete Thrust Block Data
5.2 Air Release Manhole
5.3 Manual Air Release and/or Permanent Chlorine Injection
Installation
5.4 6” or 8” Blowoff Assembly
5.5 Steel Sleeve Casing Spacer Detail
5.6 Steel Sleeve Encasement
5.7 Steel Sleeve Encasement Joint Weld Detail
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