HomeMy WebLinkAbout2021-11-01; Traffic and Mobility Commission; ; City Engineering Standards UpdateItem 6
Meeting Date: Nov. 1, 2021
To: Traffic and Mobility Commission
Staff Contact: Tom Frank, Transportation Director
Tom.Frank@carlsbadca.gov, 760-602-2766
Subject:
District:
City Engineering Standards Update
All
Recommended Action
Receive report and provide any initial comments on the city Engineering Standards update.
Executive Summary
The city is updating its Engineering Standards. The draft Engineering Standards update is posted
on the city’s webpage (Exhibit 1) and the city is inviting public feedback through Nov. 24, 2021.
This report also highlights additional revisions to address mobility related items and provides an
opportunity for initial public and commission feedback.
Discussion
The city’s Engineering Standards guide capital improvement and private development projects
to ensure safety and consistency across the city in preparation and processing of development
plans, as well as compliance with all applicable laws, codes and regulations that create a high
quality of life in Carlsbad.
Updates to the Engineering Standards are periodically needed to stay current with the latest
industry design guidelines and practices. In addition to the changes proposed in the draft
update on the webpage, the staff is proposing the redlined changes provided in Exhibit 2 to
better align with the General Plan Mobility Element and Sustainable Mobility Plan Complete
Streets Guidelines.
Several standard drawings are no longer needed and do not support the current general plan
policy or the city’s Sustainable Mobility Plan Complete Streets Guidelines. In addition to the
suggested changes provided in Exhibit 2, staff is also proposing to delete standard drawings DS-
1, GS-1, GS6, GS – 20, and GS- 32 in Volume 3.
Fiscal Analysis
This item is a report on the city’s Engineering Standards update and, as such, there is no
financial impact related to this item.
Nov. 1, 2021 Item #6 1
Next Steps
Following the comment period, staff will update the draft Engineering Standards based upon
feedback received and will route the final updates internally for a final review. The Engineering
Standards update is targeted to be approved by the City Engineer by early 2023 and the
updated Engineering Standards will be posted on the city’s webpage.
Environmental Evaluation (CEQA)
Pursuant to Public Resources Code Section 21065, receiving a report on the city’s efforts to
update their engineering standards does not constitute a “project” within the meaning of the
California Environmental Quality Act (CEQA) in that it has no potential to cause either a direct
physical change in the environment, or a reasonably foreseeable indirect physical change in the
environment, and therefore does not require environmental review.
Public Notification
This item was noticed in accordance with the Ralph M. Brown Act and was available for public
viewing and review at least 72 hours prior to the scheduled meeting date.
Exhibits
1. Draft Engineering Standards update provided at
https://www.carlsbadca.gov/departments/community-development/land-development-
engineering/engineering-codes-standards-policies/city-engineering-standards
2. Redlined suggested revisions to further address mobility
Nov. 1, 2021 Item #6 2
Draft standards update provided at:
https://www.carlsbadca.gov/departments/community-development/land-
development-engineering/engineering-codes-standards-policies/city-engineering-
standards
EXHIBIT 1
Nov. 1, 2021 Item #6 3
City of Carlsbad
Engineering
Standards
Volume 1
General Design Standards
2016 Edition2021 Edition
EXHIBIT 2
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CITY OF CARLSBAD
ENGINEERING STANDARDS
VOLUME 1 - GENERAL DESIGN STANDARDS
TABLE OF CONTENTS
CHAPTER 1 – General Design Criteria
CHAPTER 2 – Standards for the Digital Submittal of Maps and Plans
CHAPTER 3 – Public Street and Traffic Standards
CHAPTER 4 – Private Street and Traffic Standards
CHAPTER 5 – Drainage and Storm Drain Standards
CHAPTER 6 – Design Criteria for Gravity Sewer Lines and Appurtenances
CHAPTER 7 – Grading, Site Drainage and Low Impact Development (LID) Standards
REVISIONS/ADDENDUM
CHAPTER/
PAGE/DWG.
ITEM
REVISION
DATE
Chapter 1, Page 4 Table A – City of Carlsbad Street Design Criteria 10/19/05
Chapter 7 Incorporate LID to grading standards 3/24/08
Chapter 6 Various Revisions Throughout 6/30/08
Chapter 1 Table A, minimum easement width 11/30/09
Chapter 3 Public street standards, street light standards 11/30/09
Chapter 4 Revisions to Caltrans references, private street standards 11/30/09
Chapter 2 Revisions to digital submittal standards 2/24/12
General Added statement declaratory of current policy to TOC 11/21/12
Chapter 1-7 Update general design criteria, accessibility standards,
intersection max slopes, BMP Design Manual reference
2/16/16
Chapter 1-7 Draft Updates 4/23/21
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified
Formatted: Justified, Indent: Left: 0.11", Line spacing:
Exactly 10.35 pt
Formatted: Font: Arial, 10 pt
Formatted: Centered, Indent: Left: 0.19", Right: 0.19"
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CHAPTER 1 – GENERAL DESIGN CRITERIA
1. This criteria shall apply to all public works, private roads and grading design within the City of Carlsbad which is subject to the review of the City Engineer.
2. All drawings shall be on standard size sheets (24" x 36") with standard City title block. The margin at the 24" right side of the sheet shall be one inch; the balance of the margins shall
be one-half inch. All lettering shall be 1/8" or larger with hand lettering, 1/10" or larger for
machine lettering. California coordinates shall be computed and included for each plan.
3. All title sheets shall have an index or key map clearly indicating the sheet numbers issued. All index maps shall be drawn showing overall layout of the water, sewer (including required future extensions), storm drain, fire hydrants, and street signing and lighting systems. The Engineer of Work should utilize City Standard sheets, General Notes, and Erosion Control
Plans to expedite the plancheck process. These sheets are available at the Engineering
counter. They are also available in digital AutoCad data file format.
4. Each sheet is to be signed and sealed by a Registered Civil Engineer. Complex structural, electrical or mechanical installations shall also be signed by the Registered Engineer doing the design. When a soils report is required, plans shall be signed by the Soils Engineer and/or Geologist. In addition, all calculations, plats and reports shall be signed and sealed
by the engineer responsible for the design.
5. Revisions made after original approval by the City Engineer shall be initialed by the Engineer of Work and submitted to the City Engineer for approval. Plan revisions must be signed off by the City Engineer or designee prior to construction of the revised improvement.
6. All plans are to be designed and constructed in accordance with this design criteria, San
Diego Regional Standard Drawings (SDRSD), Standard Specifications for Public Works Construction (SSPWC), California Department of Transportation Traffic and Highway Design Manuals, applicable AASHTO Design Policies, San Diego County Hydrology Manual, San Diego County Map Processing Manual, City of Carlsbad Technical Guidelines for Geotechnical Reports and City of Carlsbad "Criteria", all latest editions. 7. Profiles shall be shown on the top of sheets. Vertical curves shall show curve length and
P.I. elevation, in addition to normal stationing and elevations.
8. Normally, the scales for improvement plans shall be 1" = 40' for the horizontal and 1" = 4' for the vertical. The vertical scale should be changed to 1" = 8' or other appropriate scale where grades are steep. For complex plans, the scale shall be 1" = 20' or larger when necessary for clarity.
9. Improvement and grading plans shall be prepared in indelible ink on mylar drafting film or reproduced by photo mylar (sepia, ammonia mylar or vellum are unacceptable) unless otherwise approved by the City Engineer. Additionally, digital copies of the plans shall be submitted per the City of Carlsbad "Standards for the Digital Submittal of Maps and Plans" available at the Land Use Engineering counter and attached herewith in Chapter 2.
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10. Public easements shall be a minimum of 20' in width for single facilities, 30’ in width for two
facilities unless a lesser width is specifically authorized by the City Engineer. Approved
means of all-weather access to the easement must be provided. Utility and drainage
easements parallel to side lot lines shall be laid out so that the easement is all on one lot.
Easements between existing and/or future dwelling units or building structures shall be a
minimum of 20' in width for single facilities.
11. Drainage calculations and maps shall accompany all plans submitted for checking, unless
the requirement is specifically waived.
12. All plans, calculations and reports are to be checked by the Engineer of Work (EOW) for
consistency, accuracy, clarity and conformity with City Standard Specifications, drawings,
and design criteria before submission for City review and approval. The EOW is responsible
for coordinating plans with their clients Landscape Architect, utility companies and
permitting agencies.
13. All plans, calculations and reports submitted for checking shall be accompanied by a letter
of transmittal, submittal checklist, and all applicable fees based on the Engineer's Estimate
of quantities and costs.
14. During final approval submittal, Engineer-of-work shall submit digital (pdf) copies of all
calculations/reports/studies in accordance with city submittal checklists to the satisfaction
of the City Engineer. Digital copies shall include color resolution from the original document
used to distinguish symbols, photographs, tables, exhibits, etc.
14. The original check prints shall accompany revised plans resubmitted for checking.
15. Original drawings shall become the property of the City upon being signed by the City
Engineer.
16. The original drawing shall be revised to reflect as-built conditions by the Engineer of Work
prior to final acceptance of the work by the City.
17. The Engineer-of-work shall submit maps of any proposed subdivision, drawn to a scale 1"
= 500', prior to City approval of the final subdivision map. These maps will be used to
update City of Carlsbad Fire Department run books.
18. The number of sheets submitted should normally be limited to that required for clarity of
presentation. Separate drawings for streets, water, storm drains, and sewers will not
normally be accepted.
19. Improvement plans shall show all existing trees within the street parkway and within 5'
outside the right-of-way and specifically designate those to be removed. Any tree within the
right-of-way to be removed must have specific approval to do so by the City Engineer.
20. The carlsbad engineering standards are prepared and maintained by the city of carlsbad
land development engineering division, with input from other departments. The standards
establish uniform policies and procedures for the design of public improvements. It is not
intended as, nor does it establish, a mandatory standard for these designs. The policies
established in the engineering standards are for the information and use by Engineers,
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designers and city staff. The standards are subject to amendment as conditions and
experience warrant. Special situations may call for variation from the standards, to the
satisfaction of the city engineer. The standards are not a substitute for engineering
knowledge, experience or judgement. It is not intended that any standard of conduct or duty
toward the public shall be created or imposed by the publication of these standards.
21. All plans, specifications, and supporting documents shall be signed and sealed by the
Engineer in responsible charge of the work prior to City Engineer's approval. Each sheet
shall be signed and sealed, except that bound documents may be signed and sealed on
their first page. Additionally, the first sheet of each set of plans shall have the following
certificate:
"DECLARATION OF RESPONSIBLE CHARGE"
I hereby declare that I am the Engineer of Work for this project, that I have exercised
responsible charge of the design of the project as defined in Section 6703 of the Business
and Professions Code, and that the design is consistent with current standards.
I understand that the check of project drawings and specifications by the City of Carlsbad
does not relieve me, as Engineer of Work, of my responsibilities for project design.
Firm:
Address:
City, State:
Telephone:
By:
(Name of Engineer)
Date:
R.C.E. #:
Registration Expiration Date:
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22. After City Engineer's approval of a set of plans, if a new engineer assumes responsible
charge of the work, he/she shall add, sign and seal the following statement in each sheet:
"ASSUMPTION OF RESPONSIBLE CHARGE"
As of _____________________ , I hereby assume responsible charge for design changes
to this drawing.
___________________________________ RCE#__________ Exp. ____________
(Name)
Firm:___________________________________________________________________
Address:________________________________________________________________
Telephone:_______________________
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T A B L E A
CITY OF CARLSBAD
STREET DESIGN CRITERIA
DESIGN CLASSIFICATION PRIME ARTERIAL MAJOR ARTERIAL SECONDARY ARTERIAL COLLECTOR STREET INDUSTRIAL STREET LOCAL STREET CUL-DE-SAC STREET ALLEY HILLSIDE STREET
ANTICIPATED ADT RANGES
40,000 OR
MORE
20,000 TO
40,000
10,000 TO
20,000
2,000 TO
10,000
---- 20 TO
2,000
20 TO
1000 ---- ----
Design Speed 60 MPH 50 MPH 40 MPH 30 MPH 30 MPH 25 MPH 25 MPH ---- 20 MPH
Minimum Spacing of Intersections
(including right-turn in/out) (in feet)
2,600 1,200 600 300 300 150 T’s
others
200
150 T’s
others
200
---- 150
Right-of-Way Width (in feet) 126 102 84 60 or 68 72 60/68(11) 56(12)/60/68(11) 24 64
Private Access to Adjoining Property None None Where no other access is possible
Limited subject to approval Limited subject to approval O.K. O.K. O.K. Limited subject to approval
Curb-to-Curb Distance (in feet) 13 106 (18’ median) 82 (18’ median) 64 40 or 48 52 34/42(11) 36(12)/40/42(11) 24 42
Minimum Traffic Index 9 8.5 8.0 6.0 7.0 5.0 4.5 4.0 5.0
Minimum Structural Section
(in inches) (6) 6 AC 6 AB 5 AC 6 AB
4 AC
6 AB
4 AC
6 AB
4 AC
6 AB
4 AC
64 AB(10)
4 AC
64 AB(10)
5-1/2”
PCC (8)
4 AC
4 AB(10)
Stopping Sight Distance (5) (in feet) 580 430 300 200 200 150 150 ---- 125(2)
Corner Sight Distance (9) (in feet) 660 550 440 330 330 275 275 ---- 220
Minimum Centerline Radius (in feet) 2,400 (6) 1,400 (6) 670 300 300 200 200 ---- 200
Maximum Centerline Grade (not
thru intersec.)(4)
7% 7% 10% 12%(3) 8% 12%(10) 12%(10) ---- 15%(10)
Minimum Flowline Grade 1.0% 1.0% 1.0%` 1.0% 1.0% 1.0% 1.0% 1.0% 1.0%
NOTES:
(1) N.A.
(2) Reduction to 100' with approval of City Engineer.
(3) Grades greater than 10% will require specific approval, chip seal, etc. (4) Maximum intersection grades must comply with federal, state, and local accessibility standards, subject to City Engineer approval. Consult with PROWAG, Caltrans accessibility guidelines or a Certified Accessibility Specialist person (CASp). (5) Stopping Sight Distance per CALTRANS Highway Design Manual Topic 201 and Volume 3 Section 8 in Chapter 3 of City Standards.
(6) Assumes no superelevations; includes standard crossfall. (7) Minimum grade of 2.0% is encouraged. If 1.0% minimum is not possible, special construction may be used with City Engineer approval. Gutter line of cul-de-sac bulbs and knuckles shall have minimum grade of 1.0%. Typical centerline grades at the upper reach of cul-de-sacs shall be 2% minimum.
(8) Alley sections shall conform to SDRSD G-21.
(9) Corner Sight Distance per Caltrans Highway Design manual Topic 405 and Volume 3 Section 8 in Chapter 3 of City Standards.
(10) PCC pavement required for grades over 10% (11) 28-foot clear travel way required where adjacent lots contain any portion of a Fire Hazard Zone/Fire Suppression Zone within the property line. (12) 36-foot curb-to-curb distance permissible when serving 24 or fewer lots and where adjacent lots do not contain any portion of a Fire Hazard Zone/Fire Suppression Zone within the property line. (13) As approved by City Engineer
Commented [TF1]: Need to update to Mobility Element
Typologies.
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CHAPTER 2 – STANDARDS FOR THE DIGITAL SUBMITTAL OF MAPS
AND PLANS
1.0 INTRODUCTION
The City of Carlsbad maintains a Geographic Information System (GIS) for use by all City
Departments. Major components of the GIS are parcels and public works facilities. To improve
the efficiency of data collection and use in city operations such as development processing
services, public works maintenance and operations, public safety activities (Police/Fire) and
habitat protection, the City of Carlsbad requires the submission of digital copies along with the
required number of hardcopies for the submittal of all Final Maps, Grading Plans, and
Improvement Plans. These requirements do not affect in any way existing requirements of other
departments regarding map/plan processing. See Section 4 for details of data file content and
organization.
Exceptions from these requirements may be made with the express permission of the Engineer
Manager, Land Development Engineering.
For further information or clarification of this specification, contact:
Transportation Department
City of Carlsbad
1635 Faraday Avenue
Carlsbad CA 92008
(760) 602-2769 (Engineering)
2.0 FORMAT OF DATA FOR DIGITAL SUBMITTAL
The acceptable formats for digital submittal of the data are:
AutoCAD Release 2012 or earlier (Autodesk) .dwg or .dxf format
3.0 BASIS OF BEARINGS AND COORDINATE REFERENCE
The basis of bearings and all coordinates of data submitted to the City must be in reference to the
California Coordinate System - 1983, Zone VI, 1991.35 Epoch, North American Datum of 1983
(NAD83) based on ties to the City of Carlsbad Survey Control Network monuments as
published on Record of Survey Map No. 17271, filed in the office of the San Diego County
Recorder on February 8, 2002. The coordinate ties in the digital submission must meet third order
accuracy from the control monuments to the project boundary. The project boundary will be
located in the California Coordinate System at a common tie point. All other coordinates and line
work will be scaled to ground distances and be within 0.5 feet of the true California Coordinate
System values. For vertical control, the NGVD 29 datum is still in effect.
NOTE: Use the “Xref” AutoCAD command with “CBD_ROS_NAD83.dwg” and “City
Map_NAD83.dwg” to verify project site location (insert point (0,0,0).)
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4.0 DATA LAYERING REQUIREMENTS
Final Maps, Parcel Maps - will consist of:
• file(s) of the entire map submittal area;
• layers description (digital file/ hard copy)
Improvement Plans - will consist of:
• file(s) of the entire plan submittal area;
• layers description (digital file/ hard copy)
Grading Plans - will consist of:
• file(s) of the entire plan submittal area;
• layers description (digital file/ hard copy)
NOTE: The model space of the submitted drawings should contain the entire
project (showing property lines, improvements, etc.) and it should not be
divided into sheets (used for plotting purposes.)
The City of Carlsbad Standard layers are as described in Tables 4.1 (Final Maps, Parcel Maps),
4.2 (Improvement Plans), and 4.3 (Grading Plans).
Digital submittals are to follow the City of Carlsbad layer format, or be accompanied by a digital
file or hardcopy sheet describing layer names and symbol descriptions.
TABLE 4.1 FINAL MAPS, PARCEL MAPS
LAYER NAME LAYER CONTENTS
ACREAGE net acreage text
BASE north arrow, location map, etc.
COORD coordinate values & tic marks
COV cover sheet information
EASE public/private easement lines
FLOOD 100 year flood lines and text
HATCH hatching & shading
LOTS lot lines, other property lines, and associated text
MON monumentation markers and associated text
POS procedure of survey lines and associated text
ROW right-of-way easement lines and associated text
STCL street centerline lines and associated text
STREAM streams
STROW street right-of-way lines and associated text
THALWEG watercourse thalwegs
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TABLE 4.2 IMPROVEMENT PLANS
LAYER NAME LAYER CONTENTS
ACCESS access covers (size, type, % grade)
APN assessor parcel number text
BASE north arrow, location map, etc.
COORD coordinate values & tic marks
COV cover sheet information
CURB curbs, berms, sidewalks
EASE public/private easement lines
EXGRDIDX existing grade index contours & text
EXTGRADE existing grade contours and text
FINGRADE finished grade contours and text
FINGRDIDX finish grade index contours & text
FLOOD 100 year flood lines and associated text
FLOW swales, direction of flow
FTPRINT footprints of buildings
GRID grid & grid numerical values for street & utility profiles
HATCH hatching & shading
INOUT inlets/outlets
IRRCOND irrigation conduit
IRRCONTR irrigation controllers
IRRPIPE irrigation pipe
LANDSCPLT landscape planting
LANDSCTXT landscape text
LOTS lot lines, other property lines, and associated text
MEDIAN medians
MON monumentation markers and associated text
PERCENT percentages
POS procedure of survey text and associated text
PUBELECOH public utilities - electrical: overhead
PUBELECUG public utilities - electrical: underground
PUBGAS public utilities - gas distribution
PUBHYDR public utilities - fire hydrants
PUBTELE public utilities - telephone boxes
PUBTV public utilities - cable TV
PUBWATER public utilities - water supply
RAMP ramps
RECWPROF reclaimed water profile
ROW right-of-way easement lines
SEWERSYS sewer main and associated text
SEWPROF sewer profile
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LAYER NAME LAYER CONTENTS
SPOTELEV spot elevations markers and text
STCL street centerline lines and associated text
STLIGHT electroliers
STLTCOND street lighting conduits & junction boxes
STORMDRN culvert and storm drain profiles and associated text
STPROF street profile
STREAM streams
STRMPROF storm drain profile
STROW street right of way lines and associated text
STSIGN street name signs
STSTRIPE traffic striping
THALWEG watercourse thalwegs
TREE trees (4” diameter or greater)
TSIGCOND traffic signal conduit
TSIGN regulatory & advisory signs
TSIGNAL traffic signals
TSIGNAL traffic signals and associated text
WALKS footprints of walks
WATPROF water line profile
XTREE trees to be removed
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TABLE 4.3 GRADING PLANS
LAYER NAME LAYER CONTENTS
ACCESS access covers (size, type, % grade)
APN assessor parcel number text
BASE north arrow, location map, etc.
COORD coordinate values & tic marks
COV cover sheet information
CURB curbs, berms, sidewalks
EASE public/private easement lines
EXGRDIDX existing grade index contours & text
EXTGRADE existing grade contours and text
FINGRADE finished grade contours and text
FINGRDIDX finish grade index contours & text
FLOOD 100 year flood lines and text
FLOW swales, direction of flow
FTPRINT footprints of buildings
HATCH hatching & shading
INOUT inlets/outlets
LANDSCPLT landscape planting
LANDSCTXT landscape text
LOTS lot lines, other property lines, and associated text
MEDIAN medians
PERCENT percentages
POS procedure of survey text and associated text
PUBGAS public utilities - gas distribution
PUBHYDR public utilities - fire hydrants
PUBTELE public utilities - telephone boxes
PUBWATER public utilities - water supply
RAMP ramps
ROW right-of-way easement lines and associated text
SEWERSYS sewer main and associated text
SPOTELEV spot elevations markers and text
STCL street centerline lines and associated text
STORMDRN culvert and storm drain profiles and associated text
STREAM streams
STROW street right-of-way lines and associated text
THALWEG watercourse thalwegs
TREE trees (4” diameter or greater)
TSIGNAL traffic signals
TSIGNAL traffic signals and associated text
WALKS footprints of walks
XTREE trees to be removed
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5.0 ACCEPTABLE MEDIA
The City will accept submissions of the required digital files on the following media:
• PC-formatted Compact Disk (CD)
• PC-formatted Digital Versatile Disk (DVD)
The submitter will be responsible for archival of the digital data until final acceptance.
If possible do not archive (compress) the files.
Please include all the necessary files on your submittal disk (i.e. XREF-ed files, fonts). (The
easiest way to accomplish this is by using the Pack’n Go or E-Transmit feature from AutoCAD).
All media will be submitted with labels indicating the following information: Project Name/Number Date
Company
Contact Name/Telephone Number/Email
File Names (see below for file naming conventions)
6.0 FILE NAMING CONVENTIONS
The files will be named according to the plan name with the extension .DWG or .DXF for CAD-
type files. Examples:
Carlsbad Tract Map No. 98-93 CT9893.dwg
Minor Subdivision 89-01 MS8901.dwg
Improvement Plan 360-3B I360-3B.dwg
Grading Plan 360-3A G360-3A.dwg
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CHAPTER 3 - PUBLIC STREET AND TRAFFIC STANDARDS
1. WIDTHS
A. All street classifications shall conform to the latest adopted Circulation ElementMobility Element of the General Plan and any special plan thereto (refer to Supplemental Standard Drawing GS-1).
B. Street widths shall be in accordance with Table A. Any local/neighborhood, village,
neighborhood collector, school, industrial street wider than 36 feet including parking on
both sides of street (or 20 feet excluding parking areas) shall require speed management
best management practices designs as approved by the City Engineer.
C. Intersections of arterials, depending on estimated traffic volumes, may require special design and the study shall conform with. CA MUTCD, Section 4C.01b and 01c regarding intersection control. An engineering study shall include consideration of a roundabout (yield control). If a roundabout is determined to provide a viable and practical solution, it shall be studied in lieu of, or in addition to a traffic control signal. Support: 01c Refer to Caltrans’ website (http://www.dot.ca.gov/hq/traffops/liaisons/ice.html) for more information on the Traffic Operations Policy Directive 13-02, Intersection Control Evaluation (ICE), and other resources for the evaluation of intersection traffic control strategies. The use of single and double left-turn lanes, free right-turn lanes, right-turn islands, raised medians, etc., may be required.
D.C. Where feasible, when streets are improved for only one-half width, the unimproved half shall drain away from the paved section and shall be provided with a paved ditch or adequate drainage facility, as approved by the City Engineer. A 2" x 6" redwood header shall be required at the edge of paving.
E.D. Where half-street improvements are required for streets, the developer of the first half is required to install the half-street section plus 12' of additional paving except for secondary, prime or major arterials.
F.E. Local residential streets may be required to incorporate traffic calming measures as approved by the City Engineer. These measures may include: curb extensionspop-outs, chokers, pavement treatment, medians, round-a-bouts, and traffic circles. Special Fire Department and Police Department approvals may be required.
2. GRADES
A. Vertical curves are required when grade breaks exceed 1.5%.
B. Normal crown slope on A.C. pavement shall be 2.0%.
C. The design, layout and location of pedestrian ramps shall comply with federal, state and local accessibility requirements. Engineer shall design pedestrian ramps and crossings in accordance with PROWAG, Caltrans Design guidelines (latest version) to the satisfaction of the City Engineer. Engineer shall incorporate additional detail and/or construction notes on the plans to address these requirements. In special circumstances, consult with a Certified Accessibility Specialist person (CASp).
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D. Grades greater than 10% shall be constructed of Portland Cement Concrete and shall have a rough texture surface. Grades steeper than 12% or 12% grades in excess of 400' in length require the prior approval of the City Engineer and the Fire Marshal.
E. All street plans shall extend horizontal and vertical design a minimum of 200' beyond property line to demonstrate the feasibility of future extension. For collector streets and above, an extension of a minimum 500' shall be shown. Longer extensions may be required by the City Engineer. For newly developing areas, an alignment study may be required with each project to
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show "overall circulation picture."
F. For all collector-to-arterial and arterial-to-arterial intersections, the improvement plans shall include a 20-scale plan view of the intersection detailing surface elevations on 10' x 10' grid locations. Extend grid elevations to a minimum of 50' beyond the BCR (similar requirements for collector-to-
collector intersections may be required.) G. All street widening plans shall include working copies of cross-sections not to exceed 50' on center. Additional cross-sections may be required where design situations develop.
3. ALIGNMENT
A. Streets shall normally intersect at right angles. Local streets shall have at
least 50' of tangent adjacent to an intersection, measured from extension of
the curb face. Collectors shall have at least 100'. Arterials will require special
design. An angle of intersection more than 10° from a right angle requires
special approval and design. Hillside terrain will require special design.
B. The centerline of streets entering upon opposite sides of any given street shall
normally be offset by at least 200' for local residential streets measured from
centerline to centerline. Cul-de-sac streets shall normally be designated as
"T" type intersections, and may be offset at 150'.
C. Single entry developments may be permitted when the single entry street
meets the following standards:
1) With special approval of the City Fire Marshal and City Engineer, a 36-
foot curb-to-curb residential street that serves 20 or less units. If any
portion of an adjacent lot is impacted by a Fire Hazard/Fire Suppression
Zone, a 42-foot curb-to-curb distance is required.
2) With special approval of the City Fire Marshal and City Engineer, a 40-
foot curb-to-curb residential street that serves 50 or less units, where
all units are equipped with automatic fire sprinkler systems. If any
portion of an adjacent lot is impacted by a Fire Hazard/Fire Suppression
Zone, a 42-foot curb-to-curb distance is required.
2)3) With special approval of the City Fire Marshal and City Engineer, an 4- lane secondary arterial meetingwith a raised median or major arterial and all of the following conditions: are met:
a) The length of street does not exceed one-half mile.
b) Traffic volume at entrance does not exceed 3000 ADT.
c) All buildings are equipped with automatic fire sprinkler systems
3)4) With special approval of the City Fire Marshal and City Engineer a 52-
foot wide curb-to-curb industrial street meeting and all of the following
conditions: are met:
a) The length of street does not exceed one-half mile.
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b) Traffic volume at entrance does not exceed 3000 ADT.
c) All buildings are equipped with automatic fire sprinkler systems
D. Minimum length of tangent between reversing curves shall be 100'. A lesser
length may be used for local streets or hillside streets with the approval of the
City Engineer.
E. All corner returns for local and residential collector streets shall have a
minimum 20' property line radius; arterial streets shall have a minimum
property line radius of 25'. Arterial streets may require special design.
4. STRUCTURAL SECTION
A. Design shall be for a 20 year service life in accordance with the California
Department of Transportation Highway Design Manual.
B. The preliminary design structural section shall be based upon
recommendations contained in the preliminary soils report. Verification
tests and core samples are required. When sub-grade is exposed, specific
"R" value tests shall be performed in accordance with California Test
Method (CTM) 301 by a qualified soils laboratory at locations approved by
the City. If recommendations are less than the minimum thickness for the
proposed roadway, the City's minimum standard structural section shall be
used. In either case, the City Engineer shall review the "R" value tests and
approve the recommendations for thickness of the structural section prior
to placement of base and asphaltic concrete pavement.
C. Sub-grade samples having R-values less than 12 require special design by
the soils engineer. Lime treatment may be considered if the subgrade is to
be lime treated then it shall be rerun using hydrated lime and both the non-
treated and treated samples shall be submitted for review and approval.
Percent lime for R-value tests will be determined by the soils engineer. The
sulfate content of the soil to be treated will be determined by CTM 417 and
reported. Caltrans form TL-361 shall be submitted with structural section
submittal. The minimum lime treated subgrade thickness shall be 8". The
lime treated section shall be in accordance with Section 301-5, SSPWC.
The soils engineer shall supervise and provide quality control during the soil stabilization process.
D. Extend aggregate base of roadway under curb/gutter to 6" behind back of
curb. Thickness of aggregate base shall be the same as the approved
structural section to a maximum of 6".
5. CURBS
A. Use 6" curb face with typical 128" gutter (or as otherwise specified by the
City Engineer (SDRSD G-2) unless 8" is required for drainage.
B. Median curbs shall be per GS-18.
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6. CROSS-GUTTERS
A. All cross-gutters shall be 10' minimum width and conform with San Diego
Regional Standard Drawing G-12, unless otherwise approved by the City
Engineer.
B. No cross-gutters shall be allowed on streets classified above collector. Any
variance will require the specific approval of the City Engineer.
C. Mid-block cross gutters are only allowed with specific approval of the City
Engineer.
7. SIDEWALKS
A. Sidewalks shall be installed along both sides of all streets except hillside
streets and shall be located non-contiguous with the curb for local residential
streets unless an alternate location is approved by the City Engineer.
B. The minimum width for sidewalks in any zone shall be 65.0' or as approved
by the City Engineer. A 4.0' minimum clearance shall be maintained around
all obstructions such as street lights, mailboxes, fire hydrants, guardrail, etc.
Transitions at obstacles shall be four-to-one (4:1). Sidewalks around curb
returns shall be widened on all collector and above designated arterials to
provide for future traffic signals, street lights and mounting posts and
handicap ramps.
C. Sidewalk ramps shall be required at all intersections where sidewalks are required and shall conform with the plans and SDRSStandard Drawings or as
directed by the City Engineer.
D. Meandering sidewalks require prior approval from the City Engineer.
8. SIGHT DISTANCE
A. Roadway Sight Distance: Sight distances shall be in accordance with
CALTRANS Highway Design Manual (current edition).
B. Intersection Sight Distance: The design of intersection sight distance within
the City will be governed by Topic 405 of the California Department of
Transportation HIGHWAY DESIGN MANUAL with the following additions and
clarifications:
1) Local/collector intersections and above follow CALTRANS
requirements. Signalized intersections must be designed with corner
sight distance requirements.
2) The edge of traveled way shall be considered to be the extension of the
face of curb for the purposes of determining driver setbacks. Where
temporary or interim connections are made to roads without curbs and
gutters, the travel way shall be the edge of pavement.
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9. STREET TREES AND LANDSCAPING
A. All parkways and medians shall be landscaped and irrigated as required by
City of Carlsbad Landscape Manual, Standard Drawing GS-8, and applicable
Municipal Code.
B. All plans for median landscape and irrigation systems intended for public
right-of-way maintenance by the City of Carlsbad shall be drawn on City
standard mylar sheets and shall be filed with the improvement plans for the
respective project. All other (private) landscape and irrigation plans shall be
separated for review and approval by the Planning Director.
C. All irrigation systems shall delineate water main connection, meter location
and all valves and backflow preventers.
D. All irrigation systems shall include flow calculations for each specific head
proposed and estimated coverage/saturation projections.
E. All medians shall include drainage systems to drain runoff water, but not
surface flow across streets. Medians shall be straight graded, not crowned,
even in super-elevated streets. All stamped concrete shall have thickened
edges and use 4" x 4" or 6" x 6" x #10 x #10 welded wire mesh. Felt shall be
used on all weakened plane joints.
F. All landscape shall be designed, installed and maintained to ensure adequate provision for corner sight distances.
G. The following items are not to be located in the median: controller cabinets,
backflow preventer, water meters, or any equipment which projects above the
surface.
10. STREET LIGHTS
A. Street lighting shall conform to the Caltrans Standard Specifications section
86 and Standard Plans, and the City of Carlsbad Standard Special
Provisions for Construction.
B. Spacing:
1) Street lights will be required at all intersections and spacing shall be in
conformance with the attached Table B.
2) Street lights shall normally be located on the outside of curves. Mast
arm length shall be 8'.
C. Luminaire:
1) Only 5,500 pupil lumen (40 watt) and 13,700 pupil lumen (100 watt)
High Efficiency Induction (HEI) lights shall be used unless specific
approval of the Public Works Director is obtained.
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2) Traffic signal safety lighting shall be 20,600 pupil lumen (150 watt)
HEI.
D. Foundations:
1) Street light foundations shall be anchor base type in accordance with
SDRSD E-1 and E-2.
2)1) Concrete for street light and traffic signal foundations shall be 560-C-
3250 per section 201-1, SSPWC.
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TABLE B
CITY OF CARLSBAD
STREET LIGHT SPACING CRITERIA
STREET CLASSIFICATION
RESIDENTIAL
AND
COMMERCIAL
INDUSTRIAL
AND OPEN SPACE
ADJACENT TO SCHOOLS
AND PARKS
Prime Arterial &
Major Arterial
Secondary Arterial
13,700 pupil lumen
300' staggered
600' meas. on ea. side
13,700 pupil lumen
400' staggered
800' meas. on ea. side
13,700 pupil lumen
300' staggered
600' meas. on ea. side
Collector 5,500 pupil lumen
250' staggered
500' meas. on ea. side
5,500 pupil lumen
350' staggered
700' meas. on ea. side
5,500 pupil lumen
200' staggered
400' meas. on ea. side
Industrial 5,500 pupil lumen
300' staggered
600' meas. on ea. side
5,500 pupil lumen
400' staggered
800' meas. on ea. side
----------------
Local 5,500 pupil lumen at
all intersections
250' staggered 500' meas. on ea. side
5,500 pupil lumen at
all intersections and at
mid-block
5,500 pupil lumen
200' staggered
400' meas. on ea. side
Cul-de-Sac 5,500 pupil lumen at
intersection at far end
of bulb at mid-block if
greater than 300' in
length
5,500 pupil lumen at
intersection at far end
of bulb (see industrial
street if applicable)
5,500 pupil lumen
200' staggered
400' meas. on ea. side
NOTES:
1. Intersections of prime, major and secondary arterials with each other will require minimum lighting
of 13,700 pupil lumen lights at each corner with shielding.
2. Areas of sensitive environmental or scenic concern shall require special treatment (e.g., adjacent to
ocean, lagoons, and wildlife refuges).
3. The above criteria are minimum lighting requirements. Special circumstances may require
additional lighting to provide for public safety. Examples of special circumstances include, but are
not limited to, hidden driveway locations, high use crossings, high use driveways, very large
intersections, road hazards such as dips and curves, public and private gathering points, bus stops
and others.
4. 5,500 pupil lumen Lights = 40W high efficiency induction lamps.
13,700 pupil lumen Lights = 100W high efficiency induction lamps.
The main purpose of roadway and street lighting is to provide better safety, security, and commerce through
increased visibility of the roadway at night. Although lighting from a safety and security standpoint is viewed
as a positive, there are drawbacks such as cost, light pollution, maintenance, energy use, etc. This street
light standard is designed to provide benefits for public safety, security, and commerce.
A. General:
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1) Street lighting shall conform to the most current version of the Caltrans Standard Specifications
and Standard Plans, and the City of Carlsbad Standard Special Provisions for Construction.
2) City of Carlsbad street lighting design standards apply to both private and public streets and is
intended for all new development and re-development projects within the City of Carlsbad.
B. Spacing:
1) For new construction or re-development of existing roadways, the street light spacing shall be
as identified in Table B.
2) For intersection lighting, refer to Table B notes.
3) The City Engineer will have the final decision on the lighting levels that will be required (i.e.
more or less lighting) based on street classification, night-time pedestrian use, special
circumstances, the characteristics of the surrounding area, and the proposed development.
C. Luminaire:
1) Luminaires shall be LED and cobra head style. In areas with decorative street lighting (e.g. the
Mission Bell style along El Camino Real), a decorative fixture with the same lighting
characteristics as defined in this section and Table B shall be used. The designer shall obtain
approval from the City of Carlsbad on the decorative fixture to be used.
2) Luminaires shall be Type III Distribution as defined by the Illuminating Engineering Society of
North America (IESNA).
3) Luminaires shall be full-cutoff so that light is not projected above the horizontal plane of the
fixture. External shields or reflectors are not allowed.
4) Luminaires on non-local residential streets shall have a maximum Correlated Color
Temperature (CCT) of 4000K.
5) Luminaires on local residential streets shall have a maximum CCT of 3000K.
6) Luminaires shall have an ANSI C136.41 compliant NEMA 7 pin receptacle for use with photo
controls and smart lighting applications.
D. Street Light Standard:
1) Street light poles shall be round, pre-stressed concrete utilizing an anchor base. The surface
treatment shall be exposed concrete aggregate with a graffiti-resistant coating.
2) Street light foundations shall be in accordance with San Diego Regional Standard Drawing
(SDRSD) E-1 and E-2 for standard concrete poles with no additional mounted appurtenances.
If equipment or additional appurtenances are to be mounted, the street light pole foundation
shall be specifically designed by a civil engineer.
3) Street light poles in arterial or commercial areas shall have a height of 26 feet.
4) Street light poles in residential areas shall have a height of 24 feet.
5) Mast arms shall be aluminum or galvanized steel with a length of 8 feet.
6) Luminaire mounting height shall be between 1.5’ and 2.5’ from the top of pole.
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TABLE B
CITY OF CARLSBAD STREET LIGHTING REQUIREMENTS
STREET
CLASSIFICATION
PEDESTRIAN
CLASSIFICATION LOW5
PEDESTRIAN
CLASSIFICATION MEDIUM5
PEDESTRIAN
CLASSIFICATION HIGH5
Major Arterial
Curb-to-curb width:
82' to 100'
15,400 Min. Lumens
225' Staggered1
Collector/Arterial
Connector
Curb-to-curb width:
64' to 82'
15,400 Min. Lumens
325' Staggered1
Description: Industrial
15,400 Min. Lumens
300' Staggered1
Description: Arterial
Connector, Neighborhood
Connector
15,400 Min. Lumens
200' Staggered1
Description: Identity,
Employment/Transit
Connector, Coastal
Local
Curb-to-curb width:
0' to 64'
9,600 Min. Lumens
275' Staggered1
Description: Industrial,
Local Neighborhood
9,600 Min. Lumens
225' Staggered1
Description:
Local/Neighborhood Near
a Park, Neighborhood
Connector
9,600 Min. Lumens
200' Staggered1
Description: Identity, Village,
Employment/Transit
Connector
Cul-de-sac
Curb-to-curb width:
0' to 64'
9,600 Min. Lumens
One (1) at approach, One (1) at end of cul-de-sac (2 total)
Description: Local/Neighborhood
NOTES:
1. Spacing is the distance between luminaires on the same side of the roadway.
2. Intersections of major and secondary arterials will require minimum lighting of 15,400 lumens at each
corner. All other intersections will require a minimum of one 9,600 lumen fixture except for special
circumstances determined by the City of Carlsbad.
3. Areas of sensitive environmental or scenic concern shall require special treatment (e.g., adjacent to ocean,
lagoons, and wildlife refuges) as determined by the City of Carlsbad.
4. Special circumstances may require additional lighting to provide for public safety. Examples of special
circumstances include, but are not limited to: roundabouts; hidden driveway locations; high use crossings;
high use driveways; very large intersections; road hazards such as dips and curves; public and private
gathering points; bus stops; and others. Coordinate with the City for lighting regarding special
circumstances.
5. Pedestrian Classification will ultimately be a judgement made by the City of Carlsbad. The following is
some guidance provided from ANSI/IES RP-8-14 “Recommended Practice for Roadway Lighting”:
▪ Pedestrian Classification Low – areas with very low volumes of night pedestrian usage (i.e. 10 or
fewer pedestrian per hour). Examples include residential, rural and semi-rural areas, and
industrial.
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▪ Pedestrian Classification Medium – areas where lesser numbers of pedestrians utilize the streets
at night (i.e. 10 to 100 pedestrians per hour). Examples include downtown office areas,
neighborhood shopping, and parks.
▪ Pedestrian Classification High – areas with significant numbers of pedestrians expected to be on
the sidewalks or crossing the streets during darkness (i.e. over 100 pedestrians per hour).
Examples include downtown urban areas, transit terminals, near theaters, near concert halls, and
“The Village.”
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11. TRAFFIC SIGNALS
A. The developer shall submit a design for the construction or modification of
traffic signals which are required as a condition of that development. The
design shall be in accordance with the Caltrans Standard Specifications and
Standard Plans, California Manual on Uniform Traffic Control
DevicesCaltrans Traffic Manual, and the City of Carlsbad Standard Special
Provisions for Construction (CCSSPC).
B. All work at or near an intersection shall include interim traffic control and
replacement of loop detectors if damaged or modified.
C. Interconnect Fiber Optic conduit and cable and advance warning devices
shall be incorporated into all traffic signal designs and construction as
required by the City Traffic Engineer
D. Prior to beginning design of a traffic signal plan or modification to an existing
signal, a pre-design meeting shall be held with the City Traffic Engineer or his
designated representative.
E. All traffic signals shall incorporate Type 352i ATC Traffic Signal Cabinet, 2070 ATC controller, a video detection system, Type 170E controller, Type 200SA
local intersection control program and E.V.P.E. (Emergency Vehicle Preemption Equipment) that is compatible with the existing City of Carlsbad
Fire Department emergency vehicle pre-emption emitters and radios. Type
352i ATC. The Model 332 cabinet shall be aluminum. Type III meter pedestals
shall conform to Caltrans requirements and SDG&E Service Guide
specifications. For advanced setback distances greater than 300 feet, Type B
inductive loop detectors shall be used for advanced vehicle detection. Each
inductive loop shall have individual Detector Lead-in Cable (DLC) run back to
the controller cabinet.to augment video detection system.
F. All traffic signal plans or intersection design plans, shall include the ultimate
layout of the intersection shown. Existing, proposed, and future improvements
shall be shown, including utilities. An interim signing and striping plan shall be
required as necessary.
G. Prior to installation of any traffic signal, written authorization from the City
Traffic Engineer shall be obtained. A note to this effect shall be placed on the
cover page of the signal plans.
H. All traffic signal plans shall be submitted as a separate set of improvement
plans for the associated project. Plancheck fees shall be paid for this review.
Therefore, include a separate estimate of construction costs with submittal.
I. For new traffic signal installations, signal cable shall be installed in lieu of
individual conductors.
J. Electrical service location shall be obtained from SDG&E and shown on
plans.
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12. TRAFFIC SIGNING AND STRIPING
A. All collector and arterial street improvement plans shall include traffic striping
and signing designs on a separate sheet(s) ( 1”=40’-scale recommended).
B. All striping and signing plans shall conform to the latest edition of the
California Manual on Uniform Traffic Control Devices (CA MUTCD) and
Standard Drawings. Additionally, street signs shall meet the requirements
outlined in the "City of Carlsbad Street Sign Information and Specifications"
available at the Engineering counter and attached herewith in Appendix "B".
C. All traffic signing and striping plans shall be reviewed along with the complete
set of improvement plans for the associated project. Plan check fees shall
cover this review. Include estimate of construction costs with submittal.
D. All permanent signage shall be reflective per ASTM Designation D4956 and
shall use Type IV prismatic reflective sheeting (High Intensity Primastic or
equal) unless otherwise specified. R1-1 “STOP””, R1-2 “YIELD”, R2-1
“SPEED LIMIT” and street name signs shall use Type IX prismatic cube-
corner reflective sheeting (Diamond Grade VIP or equal).
E. All pavement legends shall be the latest version of the Caltrans stencils.
F. Limit lines and crosswalks shall be field located. Crosswalks shall be high
visibility “continental” style per CA MUTCD Figure 3B-19 and have 10’ inside
dimension unless otherwise specified. Each crosswalk marking shall be 2’
wide with a spacing of 3’ between markings. Crosswalk markings shall be
parallel to the direction of vehicular travel. A 12” white limit line shall be
installed at a minimum of 4 feet in advance of the marked crosswalk.
G. All crosswalks, limit lines, stop bars, pavement arrows and pavement legends
including bike lane legends and shared lane use markings shall be
thermoplastic unless otherwise specified. Preformed thermoplastic arrows,
legends and markings shall not be acceptable.
H. The size of signs shall be based on the recommended sign sizes found in the
CA MUTCD.
C.I. Sign posts shall be square perforated steel tubing with breakaway base per
San Diego Regional Standard Drawing M-45.
D.J. The developer contractor shall furnish and install street name and traffic signs
to the satisfaction of the City Traffic Engineer.
E.K. Two street name signs shall be located on one Telspar post at every
intersection, except signalized intersections. Lettering on ground-mounted
street name signs with a speed limit of 25 mph or less shall be 4” upper-case
and 3” lower-case. Lettering on all other ground-mounted street name signs
shall be 6” upper-case and 4.5” lower-case. Supplemental lettering such as
suffixes, block numbers and directional arrows shall be at least 3” high. Street
name for public streets shall have white lettering on green background. Street
name signs for private streets shall have black lettering on white background.
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F.L. "STOP" signs (R1-1) and STOP AHEAD (W3-1) signs shall be located on
local collector intersections and above, where required by the City Engineer.
STOP signs shall be augmented with a 12” white limit line and a STOP
pavement legend at each location.
G.M. "NO OUTLETDEAD END" (W14-21) sign shall be used when the end of the
cul-de-sac cannot be seen from the intersection.
N. Other signs ("NO PARKING" or other regulatory signs) may be required by
the City Engineer.
O. Where R6-1 “ONE WAY” sign is installed on a raised median, the bottom of
the sign shall be 18” above the finished surface of the median.
P. Where OM1-3 object marker and R4-7 “KEEP RIGHT” sign are installed on a
raised median, the bottom of the OM1-3 object marker shall be 24” above the
finished surface of the median.
Q. Where OM1-3 object marker and R4-7 “KEEP RIGHT” sign are installed on a
median less than 3 feet wide, the OM1-3 object marker shall be 12”x12” and
the R4-7 sign shall be 18”x24”.
H.R. All median noses and flares shall be painted yellow.
I.S. Street lights shall be shown on signing and striping plans.
T. Whenever possible, mount signs on street light poles. When a sign is attached to a pole, it
shall be mounted using a standard City of Carlsbad approved mounting bracket with straps.
U. Green paint for bicycle lane enhancement shall be EF Series WB GRN Fast Dry 1952F
Type I and II, Product Code 183, Product Color Green (34108) by Ennis Flint or approved
equal. Paint shall meet Federal Specification TT-P-1952F Type I and II.
13. TRAFFIC CONTROL PLANS
A. Pavement markings shall be in conformance with the criteria as presented in
the latest edition of the California Manual on Uniform Traffic Control Devices.
B. All crosswalks, limit lines, pavement arrows and pavement legends shall be
thermoplastic unless otherwise specified. All pavement arrows and legends
shall be the latest version of the Caltrans Standard Plans CalTrans metric
stencil.
C. Fire hydrant pavement markers shall be included in construction of any
project in conformance with SDRSD M-19.
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D. When roadway improvement will impact an existing roadway in a manner not
covered by the California Department of Transportation Highway Design
Manual or California Manual on Uniform Traffic Control Devices, improvement
plans shall include traffic control/detour plans. Prior to design of control/detour
plans, a pre-design meeting should be held with Engineering Department
staff.
E. Detour plans and traffic control plans shall be based upon the latest edition of
the California Manual on Uniform Traffic Control Devices and the Standard
Specifications for Public Works Construction (Green Book). These detour
plans shall be submitted accompanying improvement plans for the proposed
development and conform to the provisions of Engineering Policy 29.
F. Any deviation from approved traffic control plans shall be approved by the
City Traffic Engineer or his representative prior to change in field.
14. GUARDRAILS
A. Guardrails shall be provided for secondary arterials, and above, along the
tops of slopes adjacent to roadways in accordance with Chapter 17-01 of the
California Department of Transportation Traffic Safety Systems Guidance
Traffic Manual or as required by the City Traffic Engineer. Guardrail may be
required on local or collector streets on the outside of curves where slopes
and vehicle speeds warrant.
B. Typically, sidewalks shall be located behind guardrails.
C. Guardrail shall conform with the applicable SDRSD. Additional right-of-way
may be required to accommodate flare sections.
D. Guardrail shall not encroach into required intersection sight distance corridor
areas.
15. DRIVEWAYS
MAXIMUM* MINIMUM* TYPE
Multi-Family Residential/Commercial 34 Feet/40 Feet 24 Feet 7-1/2" PCC
Residential 30 Feet 12 Feet 5-1/2" PCC
Maximum Width: Residential - 40% of lot frontage
Commercial and Industrial - 50% of lot frontage
Typical X = 3' "X" being the dimension of curb height transition.
*Clear width measured at bottom of "X", modification may be permitted if approved by the
City Traffic Engineer.
Commented [TF2]: Need to clarify street typology with mobility element
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A. Minimum clear distance between driveways on same property: 2'.
B. Minimum clear distance from property line: 3' if sidewalk is contiguous to curb, 0’ if non-contiguous.
C. Minimum distance from curb return: 0' - no encroachment.
D. Minimum distance from fire hydrant, street lights and other aboveground utilities: 5'.
E. Grades - see GS-15.
F. A minimum of 6” approved base material shall be placed under all driveways within the right-of-way.
G. Driveways within cul-de-sacs may require special design.
NOTE: All dimensions (A-D) are to top of "X" unless otherwise noted.
16. MONUMENTATION
A. Centerline monuments (SDRSD M-10A-C) shall be installed at the P.I. of all curves if found within the paved roadway (otherwise at the E.C. and B.C.), at the centerline intersection of all streets, at the radius point of all cul-de- sacs, where the boundary line crosses a street centerline and at a maximum of 1000’ on straight runs. A 5.0' offset may be used to avoid conflicts with access covers. Monuments shall be shown on improvement plans. B. Survey tie information shall be submitted to the City Engineer for all public streets monumented. Said information shall be submitted and accepted by the City Engineer prior to release of monumentation securities.
17. HILLSIDE STREETS
A. Hillside streets shall be designed on a case-by-case basis in accordance with the general guidelines established in these Standards and Chapter 21.95 of the Carlsbad Municipal Code (Hillside Ordinance).
B. Hillside streets shall be defined as those streets which traverse landforms with a slope in excess of 25% and do so in an environmentally sensitive manner. Special consideration may also be given to streets which traverse lands with slopes between 15% and 25% with the approval of the City Engineer.
C. Hillside street design criteria are as shown on Table A. Modifications may be made to this criteria with the approval of the City Engineer on a case-by- case basis. Such modifications may include, but not be limited, to the following:
1) Split roadways which step down the hillside and reduce grading quantities.
2) Off-set crown or tipped roadway sections.
3) Deletion of sidewalks on one or both sides.
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4) Reduction of tangent requirements or introduction of compound, broken back or reversed curves.
D. Where street widths have been reduced, the use of parking bays and scenic view turnouts are recommended.
E. Consistent with the Hillside Ordinance, the use of "notch" or "gunsight" road cuts through hills shall be avoided.
F. A skid resistant top course asphalt overlay will be required on all hillside streets when grades exceed 7% or where horizontal curve radii are less than 200'.
18. STREET WIDTH AND IMPROVEMENT STANDARDS VARIANCE
A. Where the literal interpretation and enforcement of these standards would result in environmental degradation or be inconsistent with the general purpose of these standards, formal written requests to vary from these standards shall be made to the City Engineer. In all cases, the variance shall be in harmony with the general purpose and intent of the standards and with the health, safety and general welfare of the public.
B. The areas wherein the design standards for street widths and improvements may be deleted or modified, may include, but not be limited to, narrowing the right-of-way width, narrowing of the roadway width, deletion of sidewalks, deletion of curbs, separation of opposing traffic lanes around sensitive environmental features, reduction of lighting standards in sensitive environmental habitats and other design modifications consistent with the conditions and intent of this section.
C. Design standard variances as determined by the City Engineer may include, but not be limited to, street width, median width, sidewalk deletions, horizontal alignments, vertical alignments, environmental issues, or design variations that could lead to a substantial conformance issue, driveway locations, and street accessory improvements.
D. Before a standards variance may be granted, it shall be determined:
1) That there are extraordinary or unusual circumstances or conditions applicable to the situation or surrounding property necessitating a variance of the standards.
2) That the granting of such variance will not cause substantial drainage problems.
3) That the granting of such variance will not conflict with existing or future traffic and parking demands or pedestrian or bicycle use.
4) That the granting of such variance will not be detrimental to the public welfare or injurious to the property or improvements in the vicinity in which the variance is granted.
5) That the granting of such variance will not adversely affect the comprehensive general plan.
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E. The applicant or other affected party may file an appeal of the decision to
the City Council within ten (10) days of City Engineer's written decision.
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CHAPTER 4 - PRIVATE STREET AND DRIVEWAY STANDARDS
1. ACCESS AND CIRCULATION
All commercial, industrial, and multi-unit residential driveways shall conform with
the following:
A. All driveways shall be designed and constructed so as to preclude the
necessity for vehicles entering the driveway to maneuver, or stack within
the traveled way or to use the traveled way as a circulation element.
B. All driveways having an ADT greater than 40, or more than four (4) units,
shall provide an approved turn-around or internal circulation to preclude
vehicles backing onto a public or private street. Perpendicular or diagonal
parking shall be discouraged on a high use driveway (see definition in
Section 7) or the private street that it serves.
C. Unless approved deceleration lanes are provided, all driveways except
residential, shall have a queuing area for in-bound traffic located off the
traveled way that serves the driveway. The queuing area shall be no less
than 10 feet wide by 20 feet long. Driveway queuing areas shall be provided
at the rate of one per 1000 ADT or any fraction thereof (i.e., 3500 ADT =
80'). Queuing depth shall be measured from face of curb.
D. No parking spaces, intersections or other decision points shall be located
in or served by a driveway queuing area.
E. Driveway spacing shall conform to the following:
1) No driveway will be allowed onto prime or major arterial streets unless
no other access is available to the lot(s) being served. If no other
access is available, a right in/out only driveway will be allowed. In this
case, high use driveways must be designed with deceleration lanes.
For medium and high use driveways, the right in/out driveway must
be located at a point no less than one-half the required intersection
spacing from any other intersection or other medium or high use
driveway. Properties located such that the preceding spacing
requirements cannot be met shall obtain access to the public street
system via the following methods in descending order of preference:
a) Via an extension of a public street through adjacent properties.
This method is preferred only when said extension is a logical
addition to the public street system and meets City Design
Criteria.
b) Via a private road with a non-revocable easement granted to the
property being served.
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c) Via a driveway on the subject property that, while otherwise not
meeting the requirements of this policy, is located optimally to
reduce side friction and traffic hazards on the arterial street.
*Medium and high use driveways so allowed shall be made
available to adjacent properties through non-exclusive easement
or by dedication of a frontage road connecting the driveway and
the adjacent properties.
2) *Low use driveway - shall be located per Public Street Design Criteria.
3) Joint use driveways shall be used wherever feasible. The burden of
showing joint use driveways to be infeasible is the developer's. The
developer must show the joint driveway to be physically impossible or
that the adjacent-owner has rejected, in writing, a bonafide, good faith
offer for purchase of the right.
F. *High use, multi-residential and commercial driveways shall be constructed
in accordance with SDRSD G-17 except that the concrete apron shall be
7-1/2" thick. Dimension R shall be 15 feet. *Low use and medium use
driveways shall be constructed in accordance with SDRSD G-14B, Throat
width shall be no less than 24 feet for residential projects and 30 feet for
commercial or industrial projects. Throat width shall be no more than 36
feet for residential projects and 40 feet for commercial or industrial projects.
The apron length shall be no less than the throat width. Spacing for high
use driveways shall be treated the same as a street intersection.
G. Driveways should be designed for 15 mph safe speed with sufficient sight
distances. Maximum center line grades are as follows:
1) *Low use driveways shall have a maximum grade of +15%.
2) *Medium use driveways shall have a maximum grade of +12%.
3) *High use driveways shall have a maximum grade of +12%.
Vertical curves (minimum 5-foot length) shall be provided when grade
break exceeds 5%. Fire Marshal may require PCC pavement for grades
over 10%.
*(See Section 7 for driveway use definitions)
H. All driveways shall be provided, at a minimum, with stopping sight distance
in accordance with the City of Carlsbad Street Design Criteria in Chapter
1.
I. Except as required by Section E.(1) above, deceleration lanes will be
required or approved only on a case-by-case basis.
J. Driveways not otherwise clearly distinguishable from a public street shall
be clearly and permanently marked and posted as private.
K. Excepting only deceleration lane circumstances, the angle of intersection
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of street and driveway shall not vary more than 10 degrees from a right
angle. When the ADT for a driveway exceeds 40, the queuing area shall
be within the 10 degree skew and shall be a tangent section.
L. Driveway widths and percentage of frontage shall be in conformance with
City Standards for Public Streets.
M. Where private streets meet public streets, Public Street Standards shall apply (access, ramps, and utilities).
N. Reciprocal access for adjacent lots shall be provided where feasible (future development shall be considered).
O. Circulation Design shall vary depending upon land use. For example, if a site changes from commercial to industrial (or vice versa) the parking, access and circulation will also change to accommodate the specific land use.
P. Dead end parking aisles over 150' deep shall have adequate turn-around space to accommodate a maximum 3-point turn for a standard passenger vehicle. No dead end parking aisles shall have a depth over 200’.
Q. Industrial and large commercial projects shall provide for semi-tractor trailer circulation and loading. The design vehicle shall be a semi-tractor trailer per California Department of Transportation Highway Design Manual, Figure 404.5B.
R. Office, small commercial and light industrial, projects shall provide access and circulation for a 42' truck or bus per California Department of Transportation Highway Design Manual, Figure 404.5F.
S. All projects shall provide access and circulation to trash enclosures. The design vehicle parameters and turning radius for a trash truck shall be the same as the truck or bus design mentioned above, Figure 404.5F.
T. All loading zones, truck bays and turn-arounds shall be free of parking stalls and obstructions. Loading zones shall not obstruct free movement and circulation of passenger cars
U. .Any street wider than 36 feet including parking on both sides of street (or 20 feet excluding parking areas) shall require speed management best management practices designs as approved by the City Engineer.
V. Intersections may require special design and the study shall conform with CA MUTCD, Section 4C.01b and 01c regarding intersection control. An engineering study shall include consideration of a roundabout (yield control). If a roundabout is determined to provide a viable and practical solution, it shall be studied in lieu of, or in addition to a traffic control signal. Support: 01c Refer to Caltrans’ website (http://www.dot.ca.gov/hq/traffops/liaisons/ice.html) for more information on the Traffic Operations Policy Directive 13-02, Intersection Control Evaluation (ICE), and other resources for the evaluation of intersection traffic control strategies.
2. ENTRANCES TO PLANNED DEVELOPMENTS
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Entrances to planned developments shall be designed in accordance with the following criteria:
A. For private street entrances that include medians:
1) Median widths shall be a minimum of 4 feet and a maximum of 8 feet.
2) Median nose shall be located 15 feet minimum from the prolongation of the face of curb of the intersecting street.
3) No portions of a private median shall be allowed in the public right- of-way.
4) No rolled curbs allowed in medians unless specifically approved as a
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traffic calming device or as directed by City Engineere.
5) Enhanced paving may be allowed in public right-of-way with the approval of the City Engineer and issuance of an encroachment agreement.
6) Lane widths shall be 14 feet minimum and 16 feet maximum.
B. For planned developments which include gated or guarded entrances:
1) Gated and guarded entrances shall meet all the above criteria.
2) A minimum queuing distance of 20 feet shall be provided for each 1,000 ADT or fraction thereof (i.e., 40 feet for 1001 ADT).
3) All medians shall be designed in accordance with AASHTO turning radii for P-vehicle. No more than a 3-point turn in accordance with the turning requirements of Figure 404.5F truck or bus. 4) Where the design includes a guard house, there should be enough street width so that entering vehicles can make a U-turn just past the guard house to allow turnaround if the guard has denied them entry. Provide AASHTO P-vehicle turning radius to accommodate the U-turns.
3. WIDTHS AND ALIGNMENT
A. Residential private street and drive aisle widths shall be as follows:
1) Private streets Minimum Width
[(from 21.45.060] Curb-to-Curb
Two (2) lanes, parking on both sides 34/42* feet
2) Drive aisles
Two (2) lanes, no parking 20/28* feet
* 28-foot clear travel way required where adjacent lots contain any portion of a Fire Hazard/Fire Suppression Zone
B. Commercial/industrial parking lots and driveways:
1) Minimum aisle widths shall be in accordance with Section 21.44.050 of the Carlsbad Municipal Code.
2) Aisle width adjacent to buildings where truck loading bays are not provided shall be a minimum of 32' wide.
3) One-way aisles shall require specific approval of the City Engineer.
C. All circulation routes as described above must be designed in accordance with City Standards and to the following design criteria:
1) Private street and private driveway traveled way widths shall conform with alignment criteria for public streets and/or Carlsbad Ordinance Section 21.45.060.
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2) Standard curve radius as defined in Table A of the Street Design Criteria may be reduced provided adequate intersection sight distance is maintained in accordance with CalTrans Highway Design Manual, Topic 405.1. The sight distance corridor must be exclusive of parking, heavy landscape over 30" in height or fenced areas.
3) Right angle curves are permitted within the following guidelines:
a) Provision is made to retain stopping sight distance per Caltrans Highway Design Manual.
b) The maximum skew for the right angle curve does not depart more than 10 degrees from the 90 degree angle.
c) The 90 degree angle curves are not located at or near the
entrance to projects with high or medium use driveways/streets. Ninety degree curves are discouraged on high use driveways/streets.
d) The standard knuckle design may be eliminated on apartment and condominium projects and planned developments with the City Engineer's approval.
4) A series of right angle turns or reversing curves are discouraged and will be allowed only with specific approval of the City Engineer. Standard tangent distances per Street Design Criteria Section 3(D) shall be required on all reversing curves.
4. SIDEWALKS
A. All private streets and driveways shall provide for pedestrian and handicapped access (accessibility requirements) to all units or buildings proposed.
B. Unless otherwise approved, sidewalks are required on both sides of all private streets and drives to provide access to all units, parking and recreation areas in a planned development or condominium project. Sidewalk circulation throughout the site is required although not necessarily adjacent to the curb.
Sidewalks may be eliminated under the following circumstances:
1) Private driveways/streets that are not through streets and have an entire street length less than 150 feet and access a maximum of 12 units.
2) Private driveways/streets that are not through streets which access eight (8) units or less and do not exceed 300 feet of entire street length.
3) Private drive aisles providing direct access to garages, carports and parking stalls in multi-family projects exceeding a density of ten (10) dwelling units per acre.
4) Single loaded streets may eliminate sidewalks on the side opposite the units when it is not needed to provide for a logical pedestrian
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circulation.
C. The City Engineer reserves the right of final determination of sidewalk locations and roadway design issues consistent with City Standards.
D. Typically, the private sidewalks, streets or driveways are dedicated as "public utility and access easements." Water, sewer, gas and electric, cable television, telephone and storm drain facilities may be included within this general easement. Utility districts may require special easement requirements.
5. DRAINAGE
A. Concrete swales between parking lot aisles are discouraged. Tipped
sections with concrete curb and gutters are preferred.
B. Hydrology and hydraulic design shall be in accordance with Public
Drainage Standards. Pipe sizing, material specifications and pre-
fabricated structures shall be designed by a Registered Civil Engineer and
are subject to approval of the City Engineer.
C. Concentrated site drainage may not surface flow across sidewalks onto
public or private streets.
D. Special design shall be required for all parking lots which, by design, may
retain storm waters to reduce downstream flooding.
E. Public storm drains may be included within the "general utility and access
easement" if specifically approved by the City Engineer.
F. Maximum fall across parking areas shall be five percent (5%).
6. STRUCTURAL SECTION
A. Private streets shall be constructed with the same structural sections as public streets.
B. Parking lots and driveways shall be designed based upon a traffic index of 4.5 and the "R" value of the soil(s) at the project site as determined by a
Registered Soils Engineer. Minimum section shall be 4" asphalt concrete. Modifications of this Standard may be made if approved by the City Engineer.
C. Truck routes through parking lots or aisles with an ADT greater than 500
shall be designed with a traffic index of 5.0. All routes leading to trash
enclosures shall be designed for heavy loading, minimum 4" A.C. over 6"
approved aggregate base. The level loading area in front of trash
enclosures shall be concrete with a minimum thickness of 7-1/2 inches in
conformance with GS-16.
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7. DEFINITIONS
A. Driveway: Includes those portions of public and private property used to
provide access from public right-of-way to private property and the areas
on public and private property used to queue or stack arriving and departing
vehicles. Driveways are the points of interface between the public/private
circulation systems.
B. Traveled Way: Includes all public streets and all private streets or drives
serving more than 50 units or an average daily trip load of 500 or more.
C. Residential Driveway: Includes all low use driveways for single family,
duplex, twin homes, or low use driveways which do not have truck access
to a trash dumpsite.
D. Low Use Driveway: Includes all driveways with an average daily trip (ADT)
load less than or equal to 200, except residential driveways.
E. Medium Use Driveway: Includes all driveways with an ADT load greater
than 200 and less than 500.
F. High Use Driveway: Includes all driveways with an ADT greater than or equal to 500.
NOTE: All other Standards for the City of Carlsbad shall apply to private streets.
Variations from these Standards may be allowed with the approval of the
City Engineer.
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CHAPTER 5 – DRAINAGE AND STORM DRAIN STANDARDS
1. GENERAL
A. All drainage design and requirements shall be in accordance with the latest
City of Carlsbad BMP Design Manual (see Volume 5), Jurisdictional Runoff
Management Plan (JRMP), Master Drainage and Storm Water Quality
Management Plan and the requirements of the City Engineer and be based
on full (build-out) development of upstream tributary basins. Below is list of
flow data and source location that may be used in support of the design flow
rate determination for projects.
Drainage Master Plan (link to be provided)
FEMA Flood Insurance Study https://msc.fema.gov/
A.B. Public drainage facilities shall be designed to carry the ten10-year six-hour
storm underground and the 100-year six-hour storm between the top of curbs.
On-grade curb inlets shall be designed to intercept the 85 percent or greater
of the 10-year six-hour peak flow rate. Sump curb inlets shall be designed to
convey the 100-year six-hour storm while adhering to other criteria listed in
this section. All roadway culverts shall be designed to accommodate a 100-
year six-hour storm with a one foot freeboard at entry conditions such as inlets
and head walls. A roadway culvert is defined as pipe, box, or other structure
that conveys non-local drainage (e.g., drainage in ditch) through the roadway
right-of-way.
B.C. The use of underground storm drain systems, in addition to standard curb and
gutter shall be required:
1) When flooding or street overflow during 100-year six-hour storm cannot be maintained between the top of curbs.
2) When 100-year six-hour storm flow from future upstream development
(as proposed in the existing General Plan) will cause damage to structures and improvements.
3) When existing adequate drainage facilities are available for use
(adjacent to proposed development).
4) When more than one travel lane of arterial and collector streets would
be obstructed by 10-year 6-hour storm water flow, or when than a 10-
foot width of travel lane (5 feet each side of crown, typically) . would be
obstructed by 10-year 6-hour storm water flow.
4)5) Special consideration will be required for super-elevated streets.
C.D. The use of underground storm drain systems may be required:
1) When the water level in streets at the design storm is within 1" of top of
curb.
2) When velocity of water in streets exceeds 11 FPS.
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3) When the water travels on surface street improvements for more than
1,000'.
D.E. The type of drainage facility shall be selected on the basis of physical and
cultural adaptability to the proposed land use. Open channels may be
considered in lieu of underground systems when the peak flow exceeds the
capacity of a 48" diameter RCP. Fencing of open channels may be required
as determined by the City Engineer.
E.F. Permanent drainage facilities and right-of-way, including access, shall be
provided from development to point of approved disposal.
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F.G. Storm Drains constructed at a depth of 15' or greater measured from finish
grade to the top of pipe or structure shall be considered deep storm drains
and should be avoided if at all possible. When required, special design
consideration will be required to the satisfaction of the City Engineer. Factors
considered in the design will include:
1) Oversized specially designed access holes/air shafts
2) Line encasements
3) Oversizing lines
4) Increased easement requirements for maintenance access
5) Water-tight joints
6) Additional thickness of storm drain
The project designer should meet with the plan checker prior to initiation of
design to review design parameters.
G.H. Concentrated drainage from lots or areas greater than 0.5 acres shall not be
discharged to City streets unless specifically approved by the City Engineer.
H.I. Diversion of drainage from natural or existing basins is discouraged.
I.J. Drainage design shall comply with the City's Jurisdictional Urban Runoff Management Plan (JURMP) and requirements of the National Pollutant Discharge Elimination System (NPDES) permit.
2. HYDROLOGY
A. Off site, use a copy of the latest edition City 400-scale topographic mapping.
Show existing culverts, cross-gutters and drainage courses based on field
review. Indicate the direction of flow; clearly delineate each drainage basin
showing the area and discharge and the point of concentration.
B. On site, use the grading plan. If grading is not proposed, then use a 100- scale
plan or greater enlargement. Show all proposed and existing drainage
facilities and drainage courses. Indicate the direction of flow. Clearly delineate
each drainage basin showing the area and discharge and the point of
concentration.
C. Use the charts in the San Diego County Hydrology Manual for finding the "Tc"
and "I". For small areas, a five minute "Tc" may be utilized with prior approval of the City Engineer.
D. Use the existing or ultimate development, whichever gives the highest "C"
factor.
E. Use the rational formula Q = CIA for watersheds less than 0.5 square mile
unless an alternate method is approved by the City Engineer. For watersheds
in excess of 0.5 square mile, the method of analysis shall be approved by the
City Engineer prior to submitting calculations.
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3. HYDRAULICS
A. Street - provide:
1) Depth of gutter flow calculation.
2) Inlet calculations.
3) Show gutter flow Q, inlet Q, and bypass Q on a plan of the street.
B. Storm Drain Pipes and Open Channels - provide:
1) Hydraulic loss calculations for: entrance, friction, junction, access
holes, bends, angles, reduction and enlargement.
2) Analyze existing conditions upstream and downstream from proposed
system, to be determined by the City Engineer on a case-by-case basis.
3) Calculate critical depth and normal depth for open channel flow
conditions.
4) Design for non-silting velocity of 2 FPS in a two-year frequency storm
unless otherwise approved by the City Engineer.
5) All pipes and outlets shall show HGL, velocity and Q value(s) for design storm.
6) Confluence angles shall be maintained between 45° and 90° from the
main upstream flow. Flows shall not oppose main line flows. 7) Design storm event shall be the 10-year storm event for pipe connections to on-grade inlets and 100-year storm event for pipe connections to sump inlets.
8) The HGL in storm drain pipe shall be below the finish grade elevations and shall be below the inlet entrance elevation (i.e., shall not impede flow into an inlet).
6)9) -See Chapter 5, Section 1 for placement of inlets criteria.
4. INLETS
A. Curb inlets at a sump condition should be designated for two CFS per lineal
foot of opening when headwater may rise to the top of curb.
B. Curb inlets on a continuous grade should be designed based on the
following equation:
Q = 0.7 L (a + y)3/2
Where: y = depth of flow in approach gutter in feet
a = depth of depression of flow line at inlet in feet
L = length of clear opening in feet (maximum 30 feet)
Q = flow in CFS, use 100-year design storm minimum
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C. Grated inlets should be avoided and not located in bicycle lanes. When
necessary, the design should be based on the Hydraulic Engineering
Circular No. 22Bureau of Public Roads Nomographs (now known as the
Federal Highway Administration). All grated inlets shall be bicycle proof.
D. All catch basins shall have an access hole in the top unless access through
the grate section satisfactory to the City Engineer is provided.
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E. Catch basins/curb inlets shall be located so as to eliminate, whenever
possible, cross gutters. Catch basins/curb inlets shall not be located within
5' of any curb return or driveway, or as approved by the City Engineer..
E. Local depressions if utilized shall not encroach into bike lane or drive
lane.and will only dip at the curb inlet a maximum of 2 inches. Otherwise,
a local depression shall not be used, and the curb flow line shall only dip at
the curb inlet a maximum of 2 inches.
F.
G. Minimum connector pipe for public drainage systems shall be 18".
H. Flow through inlets may be used when pipe size is 24" or less and open
channel flow characteristics exist.
5. STORM DRAINS
A. Minimum pipe slope shall be .005 (.5%) unless otherwise approved by the
City Engineer.
B. Minimum storm drain, within public right-of-way, size shall be 18" diameter.
C. Provide cleanouts at 300' maximum spacing, at angle points and at breaks
in grade greater than 1%. For pipes 48" in diameter and larger, a maximum
spacing of 500' may be used.
D, When the storm drain clean-out Type A dimension of “V” less “Z” is
greater than 18”, a storm drain clean-out Type B shall be used.
E. The material for storm drains shall be reinforced concrete pipe designed in
conformance with San Diego County Flood Control District's design criteria, as modified by Carlsbad Standard Specifications. Corrugated steel pipe
shall not be used. Plastic/rubber collars shall be prohibited.
F. Horizontal curve design shall conform to manufacturer recommended
specifications. Vertical curves require prior approval from the City
Engineer.
G. Storm drain inlets shall be located away from areas that have higher
pollution potential, including trash enclosures, grease bins, high traffic areas, areas intended for storage, and areas intended for commercial or
industrial processes. F.H. Non-storm water flow is not allowed in curb and gutter, storm drain pipe, or other system designed to convey storm water runoff. Non-storm water flow shall be eliminated, if possible, or conveyed to the sewer with an approved
permit (e.g., Wastewater Discharge Permit).
G.I. The pipe invert elevations, slope, pipe profile line and hydraulic grade line
for design flows shall be delineated on the mylar of the improvement plans. Any utilities crossing the storm drain shall also be delineated.
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The strength classification of any pipe shall be shown on the plans.
Minimum D-load for RCP shall be 1350 in all City streets or future rights-
of-way. Minimum D-load for depths less than 2', if allowed, shall be 2000
or greater.
H.J. For all drainage designs not covered in these Standards, the current San
Diego County Hydrology and Design and Procedure Manuals shall be
used.
K. For storm drain discharging into unprotected or natural channel, proper
energy dissipation measures shall be installed to prevent damage to the
channel or erosion. In cases of limited access or outlet velocities greater
than 18 fps, a concrete energy dissipater per SDRS D-41 will be required.
I.L. In some cases, it may be necessary to connect a public storm drain into a
private basin. For this case, the responsible party for the private basin
accepts responsibility for flows from the storm drain and the increase in
maintenance of the basin that may result.
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J.M. The use of detention basins to even out storm peaks and reduce piping is
permitted with substantiating engineering calculation and proper
maintenance agreements. Detention basins shall be fenced.
K.N. Desiltation measures for silt caused by development shall be provided and
cleaned regularly during the rainy season (October 1 to April 30) and after
major rainfall as required by the City Engineer or designee. Adequate
storage capacity as determined by the City Engineer shall be maintained
at all times.
L.O. Protection of downstream or adjacent properties from incremental flows
(caused by change from an undeveloped to a developed site) shall be
provided. Such flows shall not be concentrated and directed across
unprotected adjacent properties unless an easement and storm drains or
channels to contain flows are provided.
M.P. Unprotected downstream channels shall have erosion and grade control
structures installed to prevent degradation, erosion, alteration or
downcutting of the channel banks.
N.Q. Storm drain pipes designed for flow meeting or exceeding 20 feet per second will require additional cover over invert reinforcing steel as approved by the City Engineer.
O.R. Storm drain pipe under pressure flow for the design storm, i.e., HGL above
the soffit of the pipe, shall meet the requirements of ASTM C76, C361,
C443 for water-tight joints in the sections of pipe calculated to be under pressure and an additional safety length beyond the pressure flow point. Such safety length shall be determined to the satisfaction of the City Engineer taking into consideration such factors as pipe diameter, Q, and velocity.
P.S. An all-weather access road from a paved public right-of-way shall be
constructed to all drainage and utility improvements. The following design
parameters are required: Maximum grade 14%, 15 MPH speed, gated
entry, minimum paved width 12 feet, 38' minimum radius, paving shall be a
minimum of 4" AC over 4" Class II AB, turnaround required if over 300'.
Work areas should be provided as approved by the plan checker. Access
roads should be shown on the tentative project approval to ensure
adequate environmental review.
Q.T. Engineers are encouraged to gravity drain all lots to the street without use
of a yard drain system. On projects with new street improvements
proposed, a curb outlet per SDRSD D-27 shall be provided for single- family
residential lots to allow yard drains to connect to the streets gutter.
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CHAPTER 6 – DESIGN CRITERIA FOR GRAVITY SEWER LINES AND
APPURTENANCES
Prior to preparation of improvement plans, Engineer-of-work shall submit a rough layout
of system for review and approval by the City Engineer.
1. SEWER MAIN DEPTH AND SIZE
A. Sewer main depth and size shall be as shown below unless approved by
the City Engineer.
B. Minimum depth, finish grade to top of pipe: 6 feet
C. Maximum depth, finish grade to top of pipe: 15 feet
D. Design calculations shall be submitted to verify size and bedding design.
(Manning "N" PVC = 0.011 is norm).
E. Minimum size of mainline shall be 8". A decrease in the pipe diameter in the downstream
direction of flow will not be allowed without prior approval of the City Engineer.
F. 6" main line may be allowed on cul-de-sac streets with a maximum of 10
units.
G. All sewer laterals and main line invert elevations shall be shown in profile on
the improvement plans and shall include stations, slope, and distance.
H. All sewer mains over 15" in diameter shall require special design subject to
City Engineer approval.
2. SEWER LATERAL DEPTH AND SIZE
A. 4" minimum diameter for single-family residence.
B. 6" minimum diameter for all other use.
C. Desirable depth at property line is 5 feet (top of pipe to finish grade @ top of
curb).
3. PIPELINE MATERIAL TYPES
A. Gravity sewer pipe and fittings shall have PVC conforming to ASTM D3034
for diameters 4" – 15" and ASTM F 679 for 18" – 24", with integral-bell
gasketed joints (gasket and spigot end joint design). Pipe shall be made of
PVC plastic having a cell classification of 12454-B or 12364-B as defined in
ASTM D 1784 and shall have SDR of 35 and a minimum stiffness of 46 psi
according to ASTM D 2412.
B. All fittings and accessories shall be as manufactured and finished by the pipe
supplier or approved equal and have bell and spigot configurations
compatible with that of the pipe.
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C. PVC pipe joints shall be elastomeric gasket joints type conforming to
Standard Specifications for Public Works (Greenbook) most recent edition.
Rubber gaskets shall be factory installed and conform to ASTM F 477. Pipe
joints shall have been tested and meet watertight performance requirements
of ASTM D 3212, "Joints for Pipe Using Flexible Elastomeric Seals."
D. PVC C-900 shall be used for gravity sewer pipelines with depths equal or
greater than 15 feet. Engineering calculations shall be provided to verify that
the pipe material will accommodate the design depth and identify the required
dimension ratio.
E. Use of other pipe and fitting materials and types may be required by the City
Engineer to meet specific conditions during design or construction.
F. Service connections to the sewer main shall be watertight and not protrude
into the sewer pipe. All materials used to make the service connections shall
be compatible with each other and with the pipe material to be joined and
shall be corrosion proof.
G. Couplings used for repair, or transition to dissimilar pipe materials shall be
approved by the City Engineer and provide corrosion proof watertight seal.
See Approved Materials List, Volume 2 Appendix C.
4. DESIGN PARAMETERS FOR GRAVITY SEWER MAIN SLOPE, FLOW AND DEMAND
A. Gravity sewer pipelines shall be designed for a minimum velocity of 2
feet/second. Velocity, unless otherwise stated, shall be calculated from peak
dry weather flow.
B. Pipeline slopes shall satisfy the minimum velocity requirement
aforementioned. Maximum velocities greater than 10 ft/second should be
avoided.
Slopes for Specific Pipe Sizes 8 through 12-inch diameter:
1) 8" minimum 0.40% desirable 0.50%
2) 10" minimum 0.28% desirable 0.40%
3) 12" minimum 0.21% desirable 0.30%
Slopes for larger than 12-inch diameter pipe shall be designed to meet flow and velocity criteria and require specific approval of the City Engineer. Pipelines with horizontal curvature will require increase slope to achieve minimum required velocities.
C. Gravity pipelines with diameters of 12" and less shall be designed to flow at
depths of 0.5D during peak hour dry weather flow. Gravity pipelines with
diameters greater than 12" shall be designed to flow at depths of 0.75D during
peak hour dry weather flow.
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D. Peak hour sewer flow rates do not include infiltration or inflow (I/I). Infiltration
is defined as the addition of groundwater into the sewer collection system and
inflow is the addition of storm water into the sewer collection system. Because
sewer collection system I/I is dependent on a number of factors including
season, age of system, type of pipe material and joints, root intrusion, and
presence of storm water system, the I/I flow rates will vary from system to
system. The design of sewer pipelines connecting to sewer systems known
to have I/I, or are susceptible to I/I, shall utilize peak wet weather flow
estimates from the City of Carlsbad Sewer Master Plan or perform wet
weather flow monitoring as directed by the City Engineer. Gravity pipelines
designed to convey wet weather flow shall not exceed 0.90D for peak hour wet weather flow.
E. Flowrate Generation
1) An Equivalent Dwelling Unit (EDU) = 220 gal/day, Average Daily Flow (ADF)
2) For ADF less than 100,000 gal/day, a peaking factor (PF) of 2.5 multiplied times the ADF shall be used to determine Peak Daily Flows (PDF). PDF = ADF x 2.5
a) Residential: Single Family Residence = 1 EDU
b) Commercial Property: 1 EDU/1,800 ft2 (building space)
i) To convert raw land to square feet of building space, assume 30% coverage. This could vary significantly dependent development constraints.
ii) To convert improved pads to square feet of building space, assume 40% of coverage.
3) Industrial Property: 1 EDU/5,000 ft2 (warehouse space) 1 EDU/1,800 ft2 (office space)
a) To convert raw land to square feet of building space, assume 30% coverage. This could vary significantly dependent issues such as environmental restrictions.
b) To convert improved pads to square feet of building space, assume 40% of coverage.
c) Assume 60% of building space is warehouse, and 40% is office space.
5. HORIZONTAL AND VERTICAL LAYOUT
A. Streets: See City of Carlsbad Standard Drawing No. GS-6 for location.
B. Alley: Main to centerline shall be a minimum of three feet (3') offset.
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C. Private Street: Shall require special design and conditions. Easement shall be 20 feet minimum.
D. Horizontal Curve: SDR 35, PVC pipe may be curved horizontally through longitudinal bending with the following limitation:
Pipe Diameter
(SDR 35)
Minimum Radius
of Curvature
6-inch 150 feet
8-inch 200 feet
10-inch 250 feet
12-inch 300 feet
15-inch 375 feet
City Engineer shall approve curvatures for larger diameter pipe.
E. Vertical Curve: Vertical curves shall be permitted only when specifically
approved by the City Engineer. A detailed design drawing shall be required
for review and approval.
F. Utility Clearances: Show all underground utilities in both plan and profile.
Provide minimum separation of all utilities crossings the sewer per the
State Department of Health Services "GUIDANCE MEMO NO. 2003-02: GUIDANCE CRITERIA FOR THE SEPARATION OF WATER MAINS AND NON-POTABLE PIPELINES".
G. Manholes: Shall be located at areas described as follows:
1) Maximum spacing of manholes shall be three hundred fifty feet
(350') for mains twelve inches (12") and smaller and five hundred
feet (500') for mains over twelve inches (12") unless otherwise
approved by the City Engineer.
2) Install manholes at all changes of slope that exceeds 2% and show
inlet and outlet inverts on all manholes.
3) Install manholes at all changes in horizontal direction.
4) Install manholes at all intersections of mains.
5) Install manholes at changes of pipe sizes.
6) Install manholes at the end of all sewer mains.
7) All standard manholes shall be a minimum of five feet (5') in
diameter with no steps. Man holes shall be sequentially numbered
on the plans with manhole numbers beginning at the
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lowest invert. Three-foot stubs shall be provided for future tie-ins
and main extensions.
8) Manholes shall be Armorock or approved equal by the City
Engineering. Rehabilitation of existing Mmanholes shall be
PVCRaven 405 or approved equal epoxy coated lined per Std.
Dwg. S-1A when: depth is 15-feet or greater; slope of sewer pipe
coming into the manhole is greater than 7%; all force main
discharge manholes; the immediate upstream and downstream
manholes of inverted siphons; drop manholes; on sewer lines 15-
inch and greater; when required by the City Engineer.
9) Where there is a slope change from steep to flat of 5% or greater,
the manhole at the grade change and the next manhole upstream
shall be PVC lined.
10) Install manholes for all lateral connection in pipelines 15-inch
diameter and larger.
11) When intercepting flows from smaller pipelines in manholes, set
invert of a smaller main at ¾ of the depth of the larger main.
12) Locking manhole lids may be required in unpaved areas as directed
by the City Engineer.
13) The top cone shall be 6” below finished subgrade. Circular steel covers shall be placed on the manholes during subgrade
preparation and base rock grade work, in order to keep the sewer
system clean. Additionally, roadwork above live sewer manholes
shall require plywood type sheeting be placed inside the manhole
and above the channel to keep any debris from entering the sewer
line.
14) In unpaved areas, sewer manhole frames and covers shall be set
6”above finished grade with concrete ring and marker post marked
“sewer” per Standard Drawing S-9.
H. Cleanouts: Extend beyond permanent pavement when street is a
temporary dead end. See Standard Drawing No. S-6 for type of cap and
box.
I. Laterals: Laterals shall be constructed per Std. Dwg. No. S-7. Minimum
horizontal distance from water service, fire hydrants, light standards,
electrical transformers, etc., is 5 feet. Desirable horizontal distance is 10
feet.
1) Install at right angle or radial to the main.
2) Laterals shall not be located in driveways.
3) No connections shall be permitted on laterals other than provided
in Standard Drawing No. S-7.
Formatted: Not Highlight
Formatted: Not Highlight
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4) Location of property cleanout: See Standard Drawing No. S-7.
5) If the lowest plumbing fixture on a property is lower than 2-feet
above the nearest upstream manhole cover, then the owner must
provide a Backwater Valve to prevent a sewage backup onto the
property. The valve must be installed in a valve box for easy access
and be visible from the public right-of-way. The property owner
shall be responsible for the installation and maintenance of the
sewer Backwater Valve. The Backwater Valve shall be shown on
the precise grading and improvement plans.
6) The Contractor shall install sewer laterals using wye fittings sized
and located as shown on the Approved Plans.
7) Laterals shall be bedded, backfilled and compacted in the same
manner as the sewer main they are connected to.
J. Steep Slope Protection:
1) Sewer pipelines on 20 percent slopes or greater shall be anchored
securely with a cut-off wall per RSD SP-05 or SP-07, spaced as
follows:
a) Not over 36 feet center to center on grades 20 percent and up to 35 percent;
b) Not over 24 feet center to center on grades 35 percent and
up to 50 percent; and
c) Not over 16 feet center to center on grades 50 percent and
over.
K. All sewer mains, not located within the public right-of-way shall be provided
with a minimum 20-foot wide sewer easement. In some special cases, a
wider easement may be required; the City Engineer shall determine size.
All easements shall be easily accessible to City maintenance equipment
with all-weather roadways.
6. CONNECTIONS TO EXISTING MANHOLES
New connections to existing manholes where stubs have not been provided shall
be made by core drilling through the walls and base as directed by the City
Engineer or their representative. If intercepting flows from smaller pipelines in
manholes, set invert of a smaller main at ¾ of the depth of the larger main. Special
care shall be used to facilitate the flow when forming the tributary channel into the
existing channel.
7. MISCELLANEOUS REQUIREMENTS
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A. The City of Carlsbad will only maintain sewer mains located in dedicated
City right-of-ways and easements which have all weather vehicular
accessall weather access roads.
A.B. All weather access roads must be provided to all sewer main appurtenances (manholes, junction structures, etc.). Access roads shall be a minimum of 20 feet wide, with a maximum 15 percent slope, and shall have a minimum asphalt concrete or Portland cement concrete road section designed for H-20 loading. Where access roads are not for the
exclusive use of sewer maintenance vehicles, the road shall be designed to maintain pedestrian and/or vehicular access (as applicable) during
sewer main repair and maintenance operations and shall be a minimum of
24 feet in width. The minimum turning radius for access roads shall be 30
feet for right angle turns and 50 feet for turnarounds.
B.C. New sewer lines and appurtenances shall remain plugged and/or disconnected until the City authorizes its use.
C.D. Maintenance of sewer laterals from the main to the building shall be the
responsibility of the property owner.
D.E. Sewer laterals constructed from the property line to the building shall be
per the Uniform Building Code.
1) The vertical cleanout shall be stubbed and capped 3 feet above
rough grade during grading and/or construction of project.
2) All sewer lateral taps on existing sewer lines shall be by “shewer”
or approved equal. All work will be inspected by a City
Representative.
3) A three-inch (3”) high “S” shall be stamped on the curb face at all
sewer lateral locations.
GENERAL GUIDELINES FOR SEWER FORCE MAINS
1. The developers engineer shall submit a preliminary design report showing the
alignment, pipe size, pressure conditions, pipe materials, a rough layout plan including surge protection design and flow analysis for review and approval by the
City Engineer prior to the preparation of improvement plans.
2. Minimum cover of sewer force mains shall be 48 inches (48") from top of pipe to
ultimate finished grade. Top of pipe profile shall be shown on the improvement
plans.
3. Show all other underground utilities in both plan and profile. Provide minimum
clearances per the State of California Department of Public Health (CDPH)
"GUIDANCE MEMO NO. 2003-02: GUIDANCE CRITERIA FOR THE
SEPARATION OF WATER MAINS AND NON-POTABLE PIPELINES".
4. Sewer force mains shall be High Density Polyethylene (HDPE) manufactured in
accordance with ASTM F714, or ductile iron pipe with polyethylene liner, and
exterior corrosion control as approved by the City Engineer. PVC pipe shall be
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acceptable for operating pressures below 70% of rated pipe pressure.
5. Where possible, force mains shall be designed with a continuous uphill slope
without high points so that air-release valves are not required on the force mains.
If this is not possible, provide air-release valves manufactured by Vent-O-Mat.
6. Dual force mains may be required at the discretion of the City Engineer where
maintenance will be required on a regular basis or due to environmental
constraints.Dual force mains outside of paved roadways shall require access road
and deeded in easements (if applicable).
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7. At the discretion of the City Engineer, Force mains longer than 1-mile or with
excessive detention times may require the use of chemical addition to prevent
odors at the discharge location of the force main.
GENERAL GUIDELINES FOR SEWER LIFT STATIONS
1. Sewer Lift Stations shall not be incorporated into the City’s sewer system and shall
be avoided if at all possible, unless deemed essential by the City Engineer.
1.
2. The developer’s engineer shall meet with the City Engineer prior to the preparation
of plans to inquire about the feasibility of utilizing a lift station for a given area.
2.3. Access roads for vector trucks shall be incorporated for all Sewer Lift Stations as
required in Chapter 6 Section 7.A.
3.4. The lift station design shall be approved by the City Engineer and all component submittals shall go through the City Engineer for review.
4.5. Prepare a preliminary design report that shall be submitted to the City for review
and approval. The preliminary engineering design report shall include, at a
minimum, the description of the design criteria to be utilized, preliminary flow
computations, design calculations, calculated systems curves, water hammer
(surge) protection analysis/recommendation, identification of right-of-way requirements, number of property owners involved, listing of permit requirements,
geotechnical investigation and cost estimate based on unit costs for major elements of work. In addition, the following design elements shall be developed:
a) Site Development
b) Structural Design
c) Architectural Design
d) Hydraulic Analysis
e) Mechanical Design
f) Electrical Design
g) Instrumentation and Process Control
h) Corrosion Control
I) Odor Control
j) Noise Control
The hydraulic analysis shall include calculations of the system curve. The system
curve shall be plotted on the pump curve with the operating point identified. Every
effort shall be made to select a pump that operates at its best efficiency point. Peak and average flows shall be considered when selecting the appropriate pump.
Pump manufacturer data sheets shall also be included in the preliminary design
report submission.
If the pump station is being designed with built-in expansion capability, an economic analysis shall be submitted. The analysis shall consider capital costs as well as the operational cost of the lift station. Design assumptions (e.g. cost of electricity, cost of money) shall be determined in consultation with the City of
Carlsbad.
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5.6. General Design Requirements for Sewer Lift Stations smaller than 3 MGD shall
be as follows:
a) Lift Stations shall be designed to convey the ultimate peak hour sewer flow
rate including inflow and infiltration and meeting the latest requirements of
the “Hydraulic Institute”. No premanufactured or prefabricated lift stations
will be permitted.
b) Lift stations shall be of the “dry-pit/wet-well” type unless approved
otherwise by the City/District Engineer. Wet wells shall be lined with “T-
LOCK” PVCwith Raven 405 or approved equal epoxy coating.
c) Lift stations shall have a minimum of 32 pumps of equal size (1 duty and
21 standby). Lift stations with more than 1 Duty pump shall also provide a
minimum of 21 standby pump of equal size. Additional standby pumps may
be required for lift stations located near environmentally sensitive areas.
Pumps shall be solids handling, non-clog, self-cleaning Flygt N-Pumps or
approved equal selection shall be approved by the City Engineer.
d) Lift Stations larger than 1 MGD shall utilize an onsite odor control system.
Smaller lift stations may require odor control as determined by the City
Engineer.
e) Comminutors shall be installed on the influent sewer to wet wells at all lift
stations.
f) An emergency bypass connection shall be provided for connection to
portable pumping equipment.
g) An emergency generator shall be provided to supply backup power (100%)
to all lift station facilities.
h) Lift Stations shall be equipped with a magnetic flow meter and an alarm
system installed on the discharge force main that shall be compatible with
the City’s telemetry system.
i) Manifold pipe shall consist of ductile iron pipe of suitable pressure class.
j) Appropriate lighting and ventilation with a minimum of 12 air changes per
hour shall be included.
k) Suitable vehicle access and security fencing will be provided.
l) System head curves shall be developed for two “C” valves, C=120 to
ensure adequate flow, and a C=150 for ensuring adequate driver
horsepower and pump characteristics.
m) A surge analysis studying the force main and the related sewer lift station
shall be performed and submitted to the City for review and approval.
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CHAPTER 7 - GRADING, SITE DRAINAGE AND LOW IMPACT
DEVELOPMENT (LID) STANDARDS
1. SOILS REPORTS
A preliminary soils report is required with the submittal of all grading plans. The City Engineer may waive the requirement for the preliminary report for grading projects which have cut or fill with a height of five feet or less or where it can be shown that the preliminary report is not needed to ensure the protection of the health, safety or welfare of the public. All soil reports shall be bound within sturdy covers and signed and sealed by a registered engineer competent in the field of soils engineering. The report shall be neat and logically ordered and include an index, the City project ID, name and location of the project, the name, address and telephone number of the firm which prepared the report and the date of the report. Each page of the report shall be numbered. The preliminary soils report must be current and must reference the specific project proposed for development. Reports over one year old at time of grading plan submittal and/or reports which reference a different grading proposal must be made current by submittal of an amended report or by submittal of a signed and sealed letter from the soils engineer stating that the findings and conclusions of the previous report are current and valid for the present proposed project.
The preliminary soils report shall at a minimum include the following:
A. A written description of the proposed project or grading work to be done and a preliminary site plan;
B. A location map and geologic history of the site and surrounding region including a synopsis of the existing soils condition, description of the type and extent of the existing vegetation, description of the seismic setting and proximity of nearby faults, and presence of water on the site;
C. A description of the testing done onsite including number and location of the test holes, a map showing the location of the test sites, type and depth of the holes, depth of any found water table, evidence of seismic or landslide activity, reason for performing the test and explanation of the test results;
D. Soil profiles;
E. A description of the laboratory testing done on soil samples including a description of where the samples came from, reason for performing the test, test results and explanation of the test results;
F. Calculations, if any, needed to determine the stability of any slopes which exceed twenty feet in height or which are steeper than two horizontal to one vertical;
G. A summary of the conclusions and recommendations as to the suitability of the site for the proposed project, any building restrictions, any proposed mitigation measures, footing or building foundation recommendations, type and placement of any subsurface drains or any other recommendations as may be determined by the soils engineer;
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H. A set of recommended specifications for the grading work to be done on the site.
2. SLOPES
A. No cut or fill slope shall be steeper than two horizontal to one vertical unless
specifically approved by the City Engineer. The City Engineer may approve
a slope steeper than two to one under the following conditions:
1) The cut or fill at a steeper slope will be stable and not create a
hazard to public or private property;
2) The steeper slope is determined by the City Engineer to be
necessary to reduce the overall environmental or aesthetic impacts
of the grading project;
3) The overall project grading is consistent with the provisions of the Hillside Grading Ordinance;
4) A soils report prepared by a registered engineer qualified in the field
of soils engineering is submitted which report shall provide
calculations indicating that the proposed slope will have a factor of
safety of 1.5 or better for both deep seated and surficial failures
under saturated soil conditions.
B. Cut and fill slopes shall be set back from site boundaries in accordance
with City of Carlsbad Standard Drawing GS-14.
C. Buildings shall be set back from cut or fill slopes in accordance with City of
Carlsbad Standard Drawing GS-15, or as specifically approved by the City
Engineer.
D. Terrace drains shall be installed on all manufactured slopes exceeding
thirty feet in height. The City Engineer may waive this requirement for
slopes with a longitudinal length of one hundred feet or less, or upon the
recommendation of a registered soils engineer or geologist that such
terrace drain is not necessary for stability or erosion protection. Terrace
drains shall be designed to prevent deposition of sand and/or other soil
materials within the concrete drain. The minimum longitudinal slope shall
be two percent and maximum slope shall be twelve percent. Drainage
terraces exceeding eight feet in width need only be paved for a width of
eight feet, provided such pavement provides for a minimum channel depth
of one foot. Down drains or drainage outlets shall be provided at
approximately three hundred foot intervals along the drainage terrace. All
such down drains or outlets shall be designed to safely convey the
intercepted waters to the point of disposal.
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3. SITE DRAINAGE
A. All drainage facilities shall be designed to carry surface waters to the
nearest practical street, storm drain, or natural water course approved by
the City Engineer. When discharging concentrated flows onto natural
ground, the engineer-of-work shall provide appropriate calculations to
determine the erosive effects at the point of discharge and immediately
downstream from the discharge point. If erosive velocities will occur at the
discharge point or immediately downstream, then an appropriately
designed rip-rap field or other energy dissipating device shall be installed
to mitigate the erosive effects.
B. Graded building pads shall have a minimum slope of one percent towards
an adjoining street or an approved drainage course. A lesser slope may be
approved by the City Engineer for sites graded in relatively flat terrain, or
where special drainage provisions are made. In such cases, the City
Engineer may require a supporting recommendation by a registered soils
engineer.
C. Berms, swales or other methods and devices shall be provided at the top
of cut and fill slopes to prevent surface waters from overflowing onto and
damaging the slope face. Special drainage provisions shall be made where
a building or structure exists within five feet of the top of a slope.
4. LOW IMPACT DEVELOPMENT (LID)
A. All development projects shall be developed with LID Integrated
Management Practices (IMPs) to mimic the site’s natural hydrological function. LID uses decentralized, site-based planning and design strategies to manage the quantity and quality of storm water runoff. LID attempts to reduce the amount of runoff by mimicking the natural hydrologic function of the site. Lid focuses on minimizing impervious surfaces and promoting infiltration and evaporation of runoff before it can leave the location of
origination. Using small, economical landscape features, LID techniques
work as a system to filter, slow, evaporate, and infiltrate surface runoff at
the source (reference Mull, K.K., (2005, December) Selling Low Impact
Development: Audiences, Messages, and Media).
B. LID Design shall generally be in accordance with the latest edition of the
County of San Diego Low Impact Development Handbook, Stormwater
Management Strategies and Low Impact Development Appendices, San
Diego Considerations and LID Fact Sheets. For additional literature on LID
and best management practices consult the reference materials listed in
the latest edition of the County of San Diego Low Impact Development
Literature Index.
C. Stormwater infiltration plans, including permeable pavement, should be
reviewed by a qualified, licensed professional to provide a professional
opinion regarding the potential adverse geological conditions created by
implementation of the plans. Geotechnical conditions such as: slope
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stability, expansive soils, compressible soils, seepage, groundwater level,
and loss of foundation or pavement subgrade strength should be
addressed, and where appropriate, mitigation recommendations should be
provided. The impact on existing, proposed, and future improvements
including buildings, roads and manufactured slopes must be included in the
review.
D. For projects subject to Priority Development Project requirements, a Storm
Water Quality Management Plan (SWQMP) prepared in accordance with
Title 15 of the Carlsbad Municipal Code and the City’s BMP Design Manual
(see Volume 5 of Engineering Standards) shall be submitted concurrent
with all development permits, as triggered by thresholds in the Municipal
Permit, latest version. The SWQMP shall describe in detail all proposed
LID IMPs to be incorporated into the site design for the proposed
development.
E. Engineer shall prepare and submit a Single Sheet BMP (SSBMP) plan
prepared in accordance with the Storm Water Quality Management Plan
(SWQMP). Refer to Volume 5 Any structural BMP plan shall be clearly
labeled as such on construction plan (grading, improvement, landscape or
building) highlighting the BMPs incorporated within the respective plan.
Refer to the latest template title sheets available on the city’s website. The
developer/owner/applicant shall be responsible for the construction and/or
implementation of all BMPs as shown on the post construction BMP site
plan whether or not such BMPs are reflected on the respective construction
plans. No changes are to be made to the SSBMP site plan without the
express approval of the City Engineer or his/her designated representative.
F. Bioretention basins designed as structural BMP shall include educational
signage regarding their purpose as a permanent treatment facility for water
quality purposes. Signage locations shall be listed in the SSBMP Exhibit.
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