CITY OF SEBASTOPOL
CITY COUNCIL
AGENDA ITEM
Meeting Date: November 15, 2022
To: Honorable Mayor and City Councilmembers
From: Mario Landeros, Interim City Engineer
Subject: Water and Sewer Standard Details (“Water and Sewer Standards”) Recommendation: Adoption of Water and Sewer Standards
Funding: Currently Budgeted: _______ Yes _______ No ___X___ N/A Account Code/Costs authorized in City Approved Budget (if applicable) ____AK______ (verified by Administrative Services Department) INTRODUCTION/PURPOSE:
The item is to request Council adoption of the City’s Water and Sewer Standard Details, commonly referred to as Water and Sewer Standards.
BACKGROUND:
The City has standard details for construction of public improvements, which include streets, water, sewer, and storm drain facilities. To provide minimum standards and best engineering practices for construction by private developers and contractors, it is necessary to provide standards for construction of these public improvements and to periodically update the standard to remain compliant with current engineering and construction best practices, and state and federal regulations. The City’s Street Standards were last adopted by Council passage of Resolution No. 6371 (2021) and the Water and Sewer Standards by Resolution No. 4978 (1998). Public Works has continued the process of updating the Standards one or two categories at a time, as the budget permits. The categories of Standards that have now been updated and are ready to be adopted are the Water and Sewer Standards. These include details for:
1) Water distribution system, including but not limited to water services, valves, fittings, pipe, restraint system, fire protection, etc., and;
2) Sewer collection system, including but not limited to service laterals, cleanouts, manholes, grease interceptors, etc.
DISCUSSION:
The proposed Water and Sewer Standards are revisions to the last adopted 1998 standards and were reviewed by Public Works staff and the City Engineer. Based on these reviews the revisions were found to be appropriate for compliance with engineering and construction best practices as well as state and federal regulations. Water Standards that are pertinent to Fire Department use were also reviewed and found acceptable by the Fire Engineer and Fire Chief. Revisions to the standards in some cases were minor and in other instances were more substantive including adding new standard details not previously adopted. In addition to revisions the standard detail number system was also revised to clearly differentiate the revised standards proposed for adoption from the existing standards to be replaced (see Table 1below).
Table 1- Water and Sewer Standard Details Summary of New or Replacement Standard Details New
Detail No. Title
New
Standard
Former Standard
Replaced
SEWER COLLECTION SYSTEM STANDARDS
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New
Detail No.
Title New
Standard
Former Standard
Replaced
R-1.4 Trench Backfill and Resurfacing no S-1.1 & S-1.2
500 Standard Precast Concrete Manhole for Sanitary Sewer no S-2.1 & S-2.2 502 Shallow Manholes and Junction Structures for Multiple Laterals YES n/a 503 Inside Drop Manhole no S-2.5
504 Outside Drop Manhole no S-2.6
505 Mainline Cleanout Permanent no S-3.1
506 Temporary Mainline Cleanout no S-3.2 & S-3.3
507 Abandoned Pipe Plug no S-7.2
508 Abandoned Manhole no S-7.1
512 Manhole Frame & Cover no S-2.3
513A 4” & 6” Sewer Service Lateral and Two-Way Cleanout no S-4.1 515 Discharge for Private Force Main no S-4.6
516 Sewer-Water Main Crossing Details no S-5.2
517 Miscellaneous Pipe Installation Details no S-5.3
518 PVC Sewer Pipe Deflection Mandrel no S-5.1
519 Two Stage Grease Interceptor no S-6.1
520 Three Stage Sand & Grease Interceptor no S-6.2
521 Sampling Manhole Exterior Use no S-6.3
522 Sampling Box Building Interior YES n/a
523 Three Stage Grease Interceptor YES n/a
524 Control Sampling Manhole YES n/a
525 Recreational Vehicle Disposal Facility YES n/a
526 Food Facility Enclosure YES n/a
527 Sewage Backwater Valve Assembly no S-4.3
WATER DISTRIBUTION SYSTEM STANDARDS
850 Typical System Restraint Lengths YES n/a
851 Harness Installation for Flange Fittings no W-3.1
852 Harness Installation no W-3.2
853 Concrete Anchor Blocks for Vertical Bends no W-3.3
854 Concrete Thrust Blocks for Horizontal Bends no W-3.4 855 Water Main Lowering no W-3.5
856 Water Main Over-Structure no W-3.6
857 pg.1 Public Fire Hydrant and Lateral no W-4.1
857 pg.2 Public Fire Hydrant – Horizontal Control YES n/a 859 Temporary Blow Off and/or Metered Connection for Mains Under Construction YES n/a 860 Temporary Metered Connection when Fire Flow is Required YES n/a 861 Permanent Blow Off no W-3.7
862 Full Size Blow Off YES n/a
863A 1” High Density Polyethylene Water Service Lateral for 5/8’ x 3/4" or 1” Meter no W-5.1 863C 1-1/2” High Density Polyethylene Water Service Lateral for 1” Meter no W-5.3 864 1-1/2” High Density Polyethylene Dual Water Service Lateral no W-5.2 865A 2” High Density Polyethylene Water Service Lateral for 1-1/2” or 2” Meter no W-5.4 865B 2” Copper Water Service Lateral for 1-1/2” or 2” Meter no W-5.4 866 4” Water Service Lateral for 3” Meter no W-5.5
867 4” Water Service Lateral for 4” Meter no W-5.6
868 6” Water Service Lateral for 6” Meter YES n/a
869 Combination Water Service Stub YES n/a
870 pg. 1 Combination Water Service YES n/a
870 pg. 2 Combination Water Service YES n/a
871 Alignment of Water Mains and Placement of Mainline Valves YES n/a 872 Water Main Encasement and End Seal no S-5.4
874 Above Ground Double Check Valve Backflow Device no W-7.2 875 Below Ground Double Check Valve Backflow Device YES n/a 876 Reduced Pressure Backflow Device no W-7.1
877 Gate Valve no W-2.1
878 Butterfly Valve and Tapping Valve no W-2.2
879 pg. 1 Single Check Detector Assembly in Vault no W-5.10 879 pg. 2 Single Check Detector Assembly in Vault no W-5.10 Agenda Item Number 7
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New
Detail No.
Title New
Standard
Former Standard
Replaced
879 pg. 3 Single Check Detector Assembly in Vault no W-5.10 880 Double Check Detector Fire Line Backflow Assembly no W-7.2 881 Pressure Reducing Valve Assembly YES n/a
882 Surge Anticipator Valve and Pressure Relief Valve YES n/a 883 Combination Air and Vacuum/ Air Release Valve no W-6.1 884 Water Meter for Private Non-Residential Systems YES n/a 885 Water Meter for Private Process and Evaporative Water Lines YES n/a 886 Water Sampling Station YES n/a
887 4” Ductile Iron Multi-Service Manifold YES n/a
GOALS:
This action supports the following City Council Goals and General Plan Actions:
• Goal 2 - Maintain, Improve and Invest in the City’s Infrastructure (Water, Sewer, Streets, Circulation, Parks, Storm Drains and Public Facilities).
PUBLIC COMMENT:
As of the writing of this staff report, the City has not received any public comment. However, if staff receives public comment from interested parties following the publication and distribution of this staff report, such comments will be provided to the City Council as supplemental materials before or at the meeting. In addition, public comments may be offered during the public comment portion of this item.
PUBLIC NOTICE:
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 schedule meeting date.
FISCAL IMPACT:
There is no fiscal impact related to this action.
RECOMMENDATION:
Staff recommends the Sebastopol City Council adopt the Water and Sewer Standards by Resolution.
Attachments:
1 Resolution
2 Exhibit “A” – Water and Sewer Standards
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RESOLUTION NO. XXXX-2022
RESOLUTION OF THE CITY COUNCIL OF THE CITY OF SEBASTOPOL
ADOPTING THE WATER AND SEWER STANDARD DETAILS
WHEREAS, the City of Sebastopol has standard details, more commonly referred to as “Standards”, for construction of public improvements, which include streets, water, sewer, and storm drain facilities to provide minimum standards and engineering and construction best practices for private developers and contractors; and
WHEREAS, it is necessary to periodically update the Standards to remain compliant with current engineering and construction best practices, and state and federal regulations; and WHEREAS, the City of Sebastopol last adopted the Street Standards by Council passage of Resolution No. 6371 (2021) and the Water and Sewer Standards by Council passage of Resolution No. 4978 (1998); and
WHEREAS, the Water and Sewer Standards have now been updated, the City Engineer has reviewed these updates and the updated Water and Sewer Standards are ready to be adopted; and
WHEREAS, minor discrepancies may be found from time to time necessitating the City Engineer to periodically make minor changes to the Water and Sewer Standards to correct errors, conflicts, and discrepancies.
NOW, THEREFORE BE IT RESOLVED, that the City Council of the City of Sebastopol, as follows:
1. Finds the foregoing recitals are true and correct.
2. Adopts the Water and Sewer Standard Details (“Water and Sewer Standards”) dated October 2022 attached hereto as Exhibit “A,” and.
3. Authorizes the City Engineer to make minor changes to the Water and Sewer Standards from time to time to correct errors, conflicts, and discrepancies.
The above and foregoing Resolution was duly passed, approved, and adopted at a meeting by the City Council on the 15th day of November 2022.
I, the undersigned, hereby certify that the foregoing Resolution was duly adopted by City of Sebastopol City Council following a roll call vote:
VOTE:
Ayes: Councilmembers Glass, Gurney, Rich, Vice Mayor Hinton and Mayor Slayter Noes: None
Absent: None
Abstain: None
APPROVED:
Mayor Patrick Slayter
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ATTEST:
Mary Gourley, Assistant City Manager/City Clerk, MMC
APPROVED AS TO FORM:
Larry McLaughlin, City Attorney
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Match existing grade NON-PAVED AREAS NOTES: Aggregate base or select native backfill as approved at 90% relative compaction 6" 12"6" 6" Bedding material ROADWAYS / SIDEWALKS Where existing street is concrete overlaid with AC, the concrete section removed by trenching shall be replaced with AC to the required structural section. Final trench paving is required to be expanded to a painted lane stripe, existing pavement patch, the lip of gutter or edge of pavement where such street feature is within 3 feet of the final saw cut. If existing pavement adjacent to trench is cracked or damaged, final trench paving shall be extended to a location where a clean, smooth edge can be established. Permanent paving must be completed within 30 days. AC or cutback (1" thick) may be placed as a temporary surface in roadway areas and shall be maintained until permanent paving is completed. Where warranted and at the discretion of the Public Works Inspector, trench plates may be used for up to 2 weeks. Trench plates shall have a skid resistant surface, secured with 24" wide collar of cutback around all sides of plate, and tapered to provide smooth transitions. Temporary surface and material shall be completely removed prior to placement of permanent pavement. Contractor shall be responsible to provide adequate shoring to keep adjacent material from running into trench. Voids under pavement sections adjacent to the trench shall be filled with a 2 sack slurry or the pavement over such voids shall be removed and the area backfilled with Class 2 aggregate and compacted to 95% relative compaction. 1. 2. 3. 4. 5. 6" 12" New AC trench plug shall be placed in 2 lifts (with tack coat) and shall match existing A.C. thickness plus 1" (4" min - 7" max) Class 2 aggregate base rock at 95% relative compaction 6" 6" Final saw cut (per note 2) Initial cut Existing pavement (thickness varies) Bedding material 6" MIN 6" MIN Bedding material for all pipes except water service laterals shall be 3 8 " crushed chips. Poly water services shall be bedded in #4 grade salt-fee sand.
TRENCH BACKFILL AND RESURFACING
SCALE: NONE DRAWN: NB APPROVED:
STD. NO.
R-1.4
ML DATE: OCT 2022
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TEE
DEAD END & EACH SIDE OF A VALVE
RUN RUN BRANCH
RESTRAINED LENGTHS PROVIDED BY DESIGN ENGINEER SUPERSEDE THIS STANDARD
HORIZONTAL BENDS
VERTICAL BENDS
4"∅ PIPE "L" = 58'
6"∅ PIPE "L" = 82'
8"∅ PIPE "L" = 107'
12"∅ PIPE "L" = 131'
4"∅ PIPE "L" = 50'
6"∅ PIPE "L" = 66'
8"∅ PIPE "L" = 91'
12"∅ PIPE "L" = 115'
4"∅ PIPE "L" = 2'
6"∅ PIPE "L" = 3'
8"∅ PIPE "L" = 3'
12"∅ PIPE "L" = 4'
11-1/4° BEND
4"∅ PIPE "L" = 4'
6"∅ PIPE "L" = 5'
8"∅ PIPE "L" = 6'
12"∅ PIPE "L" = 7'
22-1/2° BEND
4"∅ PIPE "L" = 7'
6"∅ PIPE "L" = 10'
8"∅ PIPE "L" = 12'
12"∅ PIPE "L" = 15'
45° BEND
4"∅ PIPE "L" = 16'
6"∅ PIPE "L" = 23'
8"∅ PIPE "L" = 29'
12"∅ PIPE "L" = 35'
90° BEND
4"∅ PIPE "L" = 24'
6"∅ PIPE "L" = 34'
8"∅ PIPE "L" = 45'
12"∅ PIPE "L" = 55'
UPPER "L" / 45° BEND
4"∅ PIPE "L" = 12'
6"∅ PIPE "L" = 17'
UPPER "L" / 22-1/2° BEND
8"∅ PIPE "L" = 22'
12"∅ PIPE "L" = 27'
4"∅ PIPE "L" = 5'
6"∅ PIPE "L" = 7'
8"∅ PIPE "L" = 10'
12"∅ PIPE "L" =12'
LOWER "L" / 45° BEND
4"∅ PIPE "L" = 3'
6"∅ PIPE "L" = 4'
LOWER "L" / 22-1/2° BEND
8"∅ PIPE "L" = 5'
12"∅ PIPE "L" = 7'
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