10-02A - Design Standards and Sepecifications.pdf

City of Lubbock Engineering

Minimum Design Standards and

Specifications

Department of Engineering

City of Lubbock, Texas

November 27, 2023

This document contains general standards and specifications for design work on public infrastructure. At all times these regulations are subject to the direct supervision and judgment of the City Engineer who may make modifications in their implementation as may be necessary on a case-by-case basis, acting in the best interest of the public.

Approval of plans shall constitute general conformance with the City of Lubbock

Minimum Design Standards and Specifications. Approval of plans shall not relieve the

Engineer of Record or the Developer from the responsibility to comply with local, State, or Federal requirements, and/or any errors or omissions in plans and specifications.

S:\ENGINEERING\DEVELOPMENT SVCS\DESIGN STANDARDS & SPECIFICATIONS\2023\DRAFT\STD SPECS ADOPTION LETTER.DOCX

November 27, 2023

Subject: City of Lubbock Public Works Engineering

Minimum Design Standards & Specifications

To whom it may concern:

This letter is to advise of the release of the 2023 annual update to the City of Lubbock Public

Works Engineering Minimum Design Standards and Specifications. Over the past three years, the City of Lubbock Engineering staff has been working with vendors, manufacturers, engineering firms and the development community to update and improve the 2020 edition.

The Public Works Engineering Department will be reviewing plans and making comments according to these standards for any proposed infrastructure beginning November 27, 2023.

Therefore, any plans received by this department dated on or after November 27, 2023 will be reviewed under these newly adopted design and construction standards.

This manual is available in digital format on the City of Lubbock website.

Please feel free to contact me if you have any questions

Sincerely, Michael G. Keenum, P.E.

Division Director of Engineering / City Engineer

City of Lubbock

1625 13th Street

Lubbock, Texas 79401

(806) 775-2393

1314 Avenue K

2023 Design Standards and Specifications

Table of Contents i

SECTION 1

MINIMUM DESIGN STANDARDS FOR WATER DISTRIBUTION

1.01 General

1.02 Design Flow

1.03 Design Pressure

1.04 Hydraulic Design

1.05 Typical Layout

1.06 Bedding and Cover

1.07 Relation to Sanitary Sewer Mains and Appurtenances

1.08 Pipe Size and Spacing

1.09 Pipe Materials

1.10 Methods of Connection

1.11 Flanged Outlets

1.12 Valve Spacing

1.13 Fire Protection Requirements

1.14 Easements

1.15 Soil Analysis

1.16 Pipe Restraints and Reaction Blocking

1.17 Tunneling, Jacking and Boring

1.18 Dead-end Mains

1.19 Abandonment of Water Mains

SECTION 2

CHECK LIST FOR WATER DISTRIBUTION CONSTRUCTION PLANS

2.01 Plan Submittal Requirements

2.02 Plan Details

SECTION 3

MINIMUM DESIGN STANDARDS FOR SANITARY SEWERS

3.01 General

3.02 Design Flow

3.03 Hydraulic Design

3.04 Design Details

3.05 Typical Layout

3.06 Bedding and Cover

3.07 Relation to Water Mains

3.08 Abandonment of Sewer Mains and Manholes

3.09 Easements

3.10 Soil Analysis

3.11 Tunneling, Jacking and Boring

3.12 Lift Station

SECTION 4

CHECK LIST FOR SANITARY SEWER CONSTRUCTION PLANS

4.01 Plan Submittal Requirements

4.02 Plan Details

SECTION 5

STANDARD SPECIFICATIONS FOR WATER MAIN CONSTRUCTION

5.01 General

5.02 Plan Requirements

5.03 Plan Approval

5.04 Inspection

5.05 Specifications

5.06 Materials of Construction

5.07 Methods of Construction

5.08 Pneumatic Testing for Tapping Sleeves

5.09 Hydrostatic Pressure Testing

5.10 Sterilization and Bacteriological Testing

2020 Design Standards and Specifications

Table of Contents ii

5.11 Restoration and Clean Up

5.12 Warranty and Acceptance

SECTION 6

STANDARD SPECIFICATIONS FOR SANITARY SEWER MAIN CONSTRUCTION

6.01 General

6.02 Plan Requirements

6.03 Plan Approval

6.04 Inspection

6.05 Specifications

6.06 Materials of Construction

6.07 Methods of Construction

6.08 Inspection, Testing, Approval and Acceptance of Gravity Flow Sanitary Sewer Pipe and Manholes . 60

6.09 Lift Station

6.10 Restoration and Clean Up

6.11 Warranty and Acceptance

SECTION 7

APPROVED MATERIALS AND MANUFACTURERS LIST

7.01 Introduction

7.02 Product Submittal Procedures

7.03 Evaluation Process

7.04 Approval Process

7.05 Water System

7.06 Sanitary Sewer System

7.07 Water and Sanitary Sewer Systems

SECTION 8

Standard Specifications for streets and drainage construction

8.01 General

8.02 Design Standards

8.03 Testing and Inspection

8.04 Notification of Property Owners

8.05 Protection of Utilities and Irrigation Systems

8.06 Water for Construction

8.07 Concrete

8.08 Subgrade and Base

8.09 Hot Mix Asphalt Concrete Surface (HMAC)

8.10 Micro-Surfacing

8.11 Storm Sewer

8.12 Fences

8.13 Salvage of Asphalt Paving

8.14 Traffic Control

8.15 Prosecution of the Work and Working Days

8.16 Measurement and Payment

8.17 Restoration and Clean Up

8.18 Certificate of Completion and Warranty

SECTION 9

CHECK LIST FOR STREETs AND DRAINAGE CONSTRUCTION PLANS

9.01 Plan Submittal Requirements

9.02 Plan Details

SECTION 10

TYPICAL DETAILS OF CONSTRUCTION

10.01 General Details ...................................................................................................................... A

10.02 Water Details ........................................................................................................................ B

10.03 Sewer Details ........................................................................................................................ C

10.04 Street and Drainage Details .................................................................................................... D

Water Standards

Section 1 1

SECTION 1

MINIMUM DESIGN STANDARDS FOR WATER DISTRIBUTION

1.01 General

1.01.01 All water distribution system design shall be in accordance with the requirements of TCEQ Chapter 290, AWWA Standards, City of Lubbock Water System Master Plan, current City ordinances and the City of Lubbock Minimum Design Standards for Water Distribution.

1.02 Design Flow

1.02.01 The design of the water distribution system shall be based on the following:

A. Design flow for residential use:

Design Criteria Design Value Units

Peak Hourly Demand 1,000 gpcd

Maximum Daily Demand 650 gpcd

Average Daily Demand 240 gpcd

Capita per Household (Single Family) 3.2 persons

Capita per Household (Multi-family) 2.5 persons

i. Domestic water service shall be provided from an alley or easement.

ii. Lines in alleys or easements shall be adequate to provide for a maximum size water meter of 1-½ inches per lot for each 75 feet of frontage.

iii. Property owner may acquire a maximum domestic water tap and meter of 1-½ inches or the equivalent in two meters per lot for each 75 feet of frontage.

iv. Minimum size water tap and meter shall be one inch.

B. Design flow for fire protection:

Proposed Use Minimum Fire Flow (gpm)

1- and 2-Family Residential 1,000

Other Than 1- and 2-Family Residential 1,500-8,000

i. Fire protection service shall be provided from a street right-of-way or comparable easement.

ii. Flow may be from more than one fire hydrant, provided the additional hydrants are accessible to any possible fire location.

iii. Fire protection must comply with Fire Marshall’s Office regulations, and in no case be less than currently adopted International Fire Code requirements.

iv. Additional infrastructure may be required to provide fire protection service when existing water distribution lines are inadequate.

C. Design flow for development other than residential use shall be based on the following or as directed by the City Engineer or designee:

Type of Development Average Daily Demand

(gal/person/day)

Restaurant 18

School Without cafeteria or showers 18

With cafeteria; no showers 24

2 Section 1

With cafeteria and showers 30

Youth camp

Without cafeteria, restrooms or showers 6

With restrooms; no cafeteria or showers 24

With restrooms and showers; no cafeteria 30

With restrooms, showers and cafeteria 42

Office building 18

Hospital (per bed) 720

Institution (other than hospital) 240

Factories (exclusive of industrial processes) 24

Recreational Parks 6

Swimming pools 12

Country clubs 120

Airport (per passenger) 6

Self-service laundry 60

Service station/convenience store 12

i. Peak hourly demand for other than residential flows shall be 2.5 times the average daily demand.

1.03 Design Pressure

1.03.01 Distribution system shall have a maximum operating pressure of 150 pounds per square inch (psi) and a minimum operating pressure of 40 psi.

1.03.02 Distribution system shall maintain a 20 psi residual pressure during required fire flow and a 40 psi residual pressure during peak hourly demand.

1.04 Hydraulic Design

1.04.01 Distribution mains shall be designed to have a maximum velocity of 10 feet per second.

1.04.02 Distribution mains shall be designed using a Hazen-Williams friction coefficient "C" equal to 140.

1.05 Typical Layout

1.05.01 Unless approved otherwise by the City Engineer or designee, water distribution mains shall be located:

A. In north-south alleys or streets, 5 feet west of centerline.

B. In east-west alleys or streets, 5 feet north of centerline.

1.05.02 Water mains to provide service connections shall be located within an alley or easement.

A. Service connections shall not be allowed within street right-of-way without written approval of the City Engineer or designee.

B. Service lines shall not cross property boundaries into adjacent private property without coverage by a dedicated easement.

1.05.03 Where a water distribution main crosses a street, the crossing shall be made at as near to perpendicular as possible.

1.05.04 Valves shall be installed at each junction such that no more than one connecting leg is unvalved.

Section 1 3

A. At street intersections, valves shall be located at right-of-way lines unless flanged fittings are required.

B. At alley intersections with streets, valves shall be located 2 feet from the right of way line towards the centerline of the street where possible.

C. Where possible, valves in streets should be designed to fall outside of wheel paths.

1.05.05 Water mains shall be designed as looped systems.

1.05.06 Minimum radius of curvature and maximum deflection angle of pipe joints shall be restricted to 80% of manufacturer’s recommendation, after which the use of horizontal or vertical bends will be required.

1.05.07 In all instances water mains shall extend to the extremities of the platted property or the subdivision served, and further when required to tie into existing mains adjacent to the development.

1.06 Bedding and Cover

1.06.01 Water distribution mains shall ordinarily have a minimum of 4 feet of cover from top of pipe to finished ground surface.

1.06.02 All water lines shall be laid as horizontal as possible, avoiding excessive numbers of high or low points.

1.06.03 Pipe bedding and embedment shall be in accordance with the Standard Specifications for Water Main Construction but in all cases shall be not less than manufacturer recommendations.

1.07 Relation to Sanitary Sewer Mains and Appurtenances

1.07.01 No physical connection shall be made between a drinking water supply and a sewer line.

A. Appurtenances shall be designed and constructed so as to prevent any possibility of sewage entering the drinking water system.

1.07.02 Water lines shall be located a minimum of 9 feet horizontally outside to outside from existing or proposed sanitary sewer lines or appurtenances.

A. Where the 9 foot separation distance cannot be achieved, the following criteria shall apply:

i. New waterline installation—parallel lines:

a. Where a new potable waterline parallels an existing, non-pressure or pressure rated sanitary sewer main and the Design Engineer is able to determine that the existing sanitary sewer main is not leaking:

(1) The new potable waterline shall be located a minimum of 2 feet above and a minimum of 4 feet horizontally between outside diameters from the existing sanitary sewer main.

(2) Every effort shall be exerted not to disturb the bedding and backfill of the existing sanitary sewer main.

b. Where a new potable waterline parallels an existing, non-pressure or pressure rated sanitary sewer main and it cannot be determined by the Design Engineer if the existing line is leaking:

(1) The existing sanitary sewer main shall be replaced with at least 150 psi pressure rated pipe.

4 Section 1

(2) The new potable waterline shall be located a minimum of 2 feet above and a minimum of 4 feet horizontally between outside diameters from the existing sanitary sewer main.

c. Where a new potable waterline parallels a new sanitary sewer main:

(1) The sanitary sewer main shall be constructed of at least 150 psi pressure rated pipe.

(2) The new potable waterline shall be located a minimum of 2 feet above and a minimum of 4 feet horizontally between outside diameters from the existing sanitary sewer main.

ii. New waterline installation—crossing lines:

a. Where a new potable waterline crosses over an existing, non-pressure rated sanitary sewer main:

(1) A minimum 2 foot separation distance between outside diameters shall be maintained.

(2) One segment of the waterline pipe shall be centered over the sanitary sewer main such that the joints of the waterline pipe are equidistant and at least 9 feet horizontally from the centerline of the sanitary sewer main.

(3) Whenever possible, the crossing shall be centered between the joints of the sanitary sewer main.

(4) Every effort shall be exerted not to disturb the bedding and backfill of the existing sanitary sewer main.

(5) If the existing sanitary sewer main is disturbed or shows signs of leaking, it shall be replaced for at least 9 feet in both directions (18 feet total) with at least 150 psi pressure rated pipe.

b. Where a new potable waterline crosses over an existing, pressure rated sanitary sewer main:

(1) An absolute minimum separation distance of 6 inches between outside diameters shall be maintained.

(2) One segment of the waterline pipe shall be centered over the sanitary sewer main such that the joints of the waterline pipe are equidistant and at least 9 feet horizontally from the centerline of the sanitary sewer main.

(3) Whenever possible, the crossing shall be centered between the joints of the sanitary sewer main.

(4) Every effort shall be exerted not to disturb the bedding and backfill of the existing sanitary sewer main.

(5) If the existing sanitary sewer main is disturbed or shows signs of leaking, it shall be replaced for at least 9 feet in both directions (18 feet total) with at least 150 psi pressure rated pipe.

c. Where a new potable waterline crosses over a new, non-pressure rated sanitary sewer main:

(1) A minimum 2 foot separation distance between outside diameters shall be maintained.

(2) One segment of the waterline pipe shall be centered over the sanitary sewer main such that the joints of the waterline pipe are equidistant and at least 9 feet horizontally from the centerline of the sanitary sewer main.

(3) Whenever possible, the crossing shall be centered between the joints of the sanitary sewer main.

(4) The sanitary sewer main shall be embedded in flowable fill from one quarter of the diameter of the sanitary sewer main below the centerline of the pipe up to 12

Section 1 5 inches above top of pipe for the total length of one pipe segment, minimum 9 feet in each direction from water line, plus 12 inches beyond the joint on each end.

d. Where a new potable waterline crosses over a new, pressure rated sanitary sewer main:

(1) An absolute minimum separation distance of 6 inches between outside diameters shall be maintained.

(2) The sanitary sewer main shall be constructed of at least 150 psi pressure rated pipe.

(3) One segment of the waterline pipe shall be centered over the sanitary sewer line such that the joints of the waterline pipe are equidistant and at least 9 feet horizontally from the center line of the sanitary sewer main.

(4) Whenever possible, the crossing shall be centered between the joints of the sanitary sewer main.

(5) The sanitary sewer main shall be embedded in flowable fill from one quarter of the diameter of the sanitary sewer main below the centerline of the pipe up to 12 inches above top of pipe for the total length of one pipe segment, minimum 9 feet in each direction from water line, plus 12 inches beyond the joint on each end.

e. When a new potable waterline crosses under a sanitary sewer main:

(1) An absolute minimum separation distance of 1 foot between outside diameters shall be maintained.

(2) The waterline shall be encased in an 18-foot or longer section of pipe or be constructed of ductile iron or steel pipe with mechanical or welded joints as appropriate.

(3) The encasing pipe shall be centered on the sewer line and shall be at least 2 nominal pipe diameters larger than the water line.

(4) The carrier pipe shall be supported at 5-foot or less intervals with spacers.

(5) Each end of the casing shall be sealed with watertight non-shrink cement grout or a manufactured watertight seal.

(6) Both the waterline and sanitary sewer main must pass a pressure and leakage test as specified in AWWA C600.

iii. The use of brown coloring in flowable fill for pressure rated sanitary sewer main embedment is recommended for identification during future construction.

iv. In all cases, suitable backfill or other structural protection shall be provided to preclude settling and/or failure of the higher pipe.

B. Location of fire hydrants

i. Fire hydrants shall not be installed within 9 feet vertically or horizontally of any sanitary sewer main, manhole or service line regardless of construction.

C. Location of potable or raw water supply or suction lines

i. Suction mains to pumping equipment shall not cross sanitary sewer mains or sanitary sewer service lines.

ii. Raw water supply lines shall not be installed within 5 feet of any tile or concrete sanitary sewer main or sanitary sewer service line.

D. Proximity of septic tank drain fields

i. Waterlines shall not be installed closer than 20 feet to septic tank drain fields.

1.07.03 Water and sewer lines shall be installed in separate trenches.

6 Section 1

1.07.04 For other instances not covered in these design standards, consult current TCEQ regulations.

1.08 Pipe Size and Spacing

1.08.01 Distribution mains shall be located and sized in accordance with the current City of Lubbock Water System Master Plan and current TCEQ rules as well as these minimums:

Water Line Size Spacing

12-inch or larger Section Line (mile)

10- or 12-inch Half-Section Line (1/2 mile)

6- or 8-inch Eighth-Section Line (660 feet)

1.08.02 The standard pipe sizes that shall be used are 6-, 8-, 10-, 12-, 16-, 20- and 24-inch. Pipe sizes not listed here are considered non-standard and shall not be used in the City of Lubbock water distribution system, unless approved by the City Engineer or designee.

1.09 Pipe Materials

1.09.01 All pipe used in the City of Lubbock water distribution system shall be Cement-lined Ductile Iron, C900 PVC, C905 PVC, C301 Prestressed-Concrete Steel Cylinder Pressure or Concrete Bar-wrapped Steel Cylinder Pressure Pipe.

1.09.02 See City of Lubbock Standard Specifications for Water Main Construction for details on materials and methods of construction.

1.10 Methods of Connection

1.10.01 Tapping Sleeves

A. Tapping sleeves with tapping valves shall be used whenever possible for connections to existing mains in order to avoid interruption of water service.

B. Maximum tap size shall be no larger than one standard size smaller than the main to be tapped.

C. Size-on-size taps shall not be allowed without prior approval by the City Engineer or designee.

D. Using a tapping sleeve of one standard size smaller than the main to be tapped and immediately increasing the pipe to a larger size shall not be allowed without prior approval by the City Engineer or designee.

1.10.02 Cut-in Tees

A. When it is necessary for a size-on-size connection and interruption of water service is not an issue, a cut-in tee with valve shall be used.

B. Cut-in tees shall not be used without prior approval by the City Engineer or designee.

1.10.03 Service Connections

A. Taps shall be provided in water main lines for service connections at each lot or building site.

B. Service connections shall ordinarily be located 5.0 feet north or west of the centerline of the lot.

C. Service lines shall not cross property boundaries into adjacent private property without coverage by a dedicated easement.

D. Typical sizes of service connections are 1 inch, 1 ½ inch, or 2 inch diameter for residential, commercial, or industrial service. Service taps 3 inches or larger are available for commercial

Section 1 7 and industrial only.

E. Maximum size service connection shall be no larger than one standard size smaller than the main to be tapped.

F. Size-on-size service connections are not allowed.

1.11 Flanged Outlets

1.11.01 All side outlets for valve attachments on lines 16-inches and larger shall be flanged.

1.12 Valve Spacing

1.12.01 Valves shall be provided in the distribution system so that no single accident, break or repair will necessitate shutting down a length of pipe greater than 600 feet.

A. On distribution mains 12-inch diameter and smaller, valves shall be located at each tee, cross or other junction.

B. Valves shall be installed at each junction such that no more than one connecting leg is unvalved.

1.12.02 On 16-inch arterial mains, valves shall be spaced no greater than 800 feet as the arterial feeder main traverses undeveloped land or is not intersected by other distribution mains.

1.12.03 Transmission mains 20-inch diameter and larger shall be equipped with valves at one-half mile intervals unless intersected by arterial mains or other distribution mains, or it is determined that more valves are required.

1.12.04 Valves at street intersections shall be located 5’ outside of the radius of the curb so that the traffic in the intersection shall not be blocked when operating the valve. Valves at alley to street intersections shall be located within the alley return, at least 2’ from any edge.

1.13 Fire Protection Requirements

1.13.01 Fire protection must comply with Fire Marshall’s Office regulations, and in no case be less than currently adopted International Fire Code requirements.

A. Each building in the city limits shall be within 500 feet of a fire hydrant, as measured by lay-of-hose length.

1.13.02 In all cases, the following criteria shall be adhered to:

A. Fire hydrant leads shall be minimum 6-inch diameter, sole purpose and shall not exceed 150 feet in length. The entire length of the lead shall be mechanically restrained.

B. Private fire protection lines and hydrant leads shall connect at the main with a gate valve or tapping valve of at least equal size to the fire protection line.

C. A fire hydrant is required within 200 feet of a Fire Department Connection.

D. Fire lines from public mains to buildings shall be installed by a state certified fire sprinkler firm and tested to Fire Marshall’s Office requirements.

E. Fire hydrants shall be located at intersections wherever possible.

i. Consult Section C-104 of the International Fire Code for requirements on hydrants that may obstruct access during fire fighting operations.

F. A hydrant shall be placed at the throat or beginning of each cul-de-sac at the intersecting street.

i. Additional fire hydrants may be required based on length of cul-de-sac.

8 Section 1

ii. Fire hydrants placed at the bulb end of cul-de-sacs should be avoided.

G. On divided highways hydrants shall be placed on each side of the highway wherever possible.

H. Fire hydrants shall be installed with the 4-inch nozzle facing the required access way or street.

I. Fire hydrants shall be installed and maintained so that the center of the lowest water outlet is 18 inches above the ground.

J. Fire hydrants shall be placed so that they are readily visible from the street and shall be no closer than 2 feet nor further than 5 feet from back of curb.

K. A reflective, blue, raised pavement marker shall be placed at the center of the required access way or street for any new fire hydrant installation, in line with the 4-inch nozzle.

L. No bushes, ground cover over 6 inches in height, or other obstructions shall be placed within a 5 foot radius in all directions of a hydrant or fire department connection.

M. Where fire hydrants are vulnerable to vehicular damage, appropriate crash posts shall be provided.

i. No obstructions shall exist within a 3-foot working area of each fire hydrant.

ii. Crash posts shall be 4-inch, cement-filled pipe with a minimum of 3 feet above finished grade and 2 feet of pipe anchored in concrete below grade.

N. Fire hydrants shall be in operation before framing is started or combustibles are stored on any construction site.

O. Streets and fire access roadways shall be able to support fire apparatus in wet weather before framing is started or combustibles are stored on any construction site.

P. Fire hydrant shall be installed with flange 0.2 to 0.4 foot above finished grade so that the bury line will be between finished grade and 0.2 foot above finished grade.

Q. No size-on-size taps for fire suppression shall be allowed.

1.14 Easements

1.14.01 When it is determined not to be feasible to construct a public water distribution main in a street or alley, the installation may be made in a dedicated easement or right-of-way.

1.14.02 The minimum width of an easement or right-of-way for a public water distribution main is 10 feet exclusive, 20 feet if shared with a public sanitary sewer main or other utilities or if depth of water distribution main is greater than 10 feet.

1.14.03 Easements will not be allowed between residential lots unless they are in combination with a drainage easement or with prior approval from the City Engineer or designee.

1.14.04 When a fire hydrant is to be installed on private property, an easement shall be dedicated which provides a minimum of 5 feet clearance in all directions from the center of the fire hydrant.

1.15 Soil Analysis

1.15.01 The Contractor or Design Engineer may be required to submit a report showing the types and characteristics of the soils to be encountered, water table elevations along the proposed water distribution main, recommended methods of dewatering for water distribution main construction, and the recommended methods of backfilling and compacting to be used.

1.16 Pipe Restraints and Reaction Blocking

Section 1 9

1.16.01 The size of required pipe restraints and reaction blocks shall be determined by the Design Engineer for the project based on the allowable soil pressure and the anticipated working pressure plus water hammer of the line.

1.16.02 For restrained joint lengths required, refer to Appendix A as derived from EBAA Iron, Inc.

1.17 Tunneling, Jacking and Boring

1.17.01 Tunneling, jacking and boring are methods used for water line placement under restrictive conditions when open cut construction is not allowed.

A. Only straight pipe alignments for both horizontal and vertical alignment are allowed.

B. Casing shall extend full width of right-of-way or as directed by the City Engineer or designee.

C. Casing pipe shall be a minimum of two standard sizes larger than encased pipe.

D. Casing pipe thickness shall be:

Casing Diameter Minimum Casing Thickness

<24 inches 3/8 inch

≥24 inches 1/2 inch

E. Manufactured centralizers or spacers shall be required at minimum 5-foot intervals or as recommended by the manufacturer.

i. Only purpose-built centralizers may be used.

F. Coal tar coating for casing pipe shall conform to AWWA C203.

G. For bores in excess of 100 feet, purpose-built fused or restrained joint pipe shall be used.

H. All bores must comply with City of Lubbock Ordinance Section 3.01.

1.17.02 Slick boring or directional drilling without encasement shall be considered on a case-by-case basis by the City Engineer or designee. All slick bores shall be restrained or encased.

1.17.03 No annular space shall remain between casing, or uncased pipe, and bored hole.

1.17.04 Unbraced, uncased bore holes shall be left open no more than 24 hours.

1.18 Dead-end Mains

1.18.01 A dead-end main is defined as a length of water line greater than 150 feet with no looped connection.

1.18.02 Dead-end mains shall not be allowed unless approved by the City Engineer or designee.

1.18.03 Where dead-end mains are necessary as a stage in the growth of the system, they shall be designed so that:

A. The system may be periodically flushed by use of a blow-off valve or fire hydrant, or

B. A temporary looped connection is installed.

1.19 Abandonment of Water Mains

1.19.01 When a water line is to be abandoned, allowances shall be made so that existing and new water mains may be in service simultaneously, thereby providing a means for transferring

10 Section 1 customer’s service from the old main to the new main with minimal interruption.

1.19.02 If the construction of a proposed main necessitates the abandoning of the existing main prior to the new main’s placement into service, provisions for a temporary water main with services must be addressed.

1.19.03 On mains to be abandoned, the designer shall note locations of cut and plug as close as possible to the main that remains in service.

1.19.04 Fire hydrants, valves and other fittings located on mains to be abandoned shall be removed and delivered to the City of Lubbock Water Utilities Department.

Water Check List

Section 2 11

SECTION 2

CHECK LIST FOR WATER DISTRIBUTION CONSTRUCTION PLANS

2.01 Plan Submittal Requirements

2.01.01 All water main construction plans shall be checked for conformance with City of Lubbock Minimum Design Standards for Water Distribution prior to submittal to the Engineering Department. Approval of plans is for general conformance with the City of Lubbock Minimum Design Standards and Specifications. Approval of plans shall not relieve the Engineer or Developer from any City, State or other governing requirements nor for errors or omissions in plans and specifications.

2.01.02 Plan Review

A. The Design Engineer shall submit water main construction plans to the City Engineer or designee for review and comment. The Design Engineer shall use the City of Lubbock Customer Self Service (CSS) website to submit plans.

http://egovaccess.ci.lubbock.tx.us/EnerGov_Prod/SelfService/#/home

B. Please call 806-775-2347 if you have any questions regarding the CSS submission process.

C. Upon completion of review and receipt of payment for appropriate Plan Review fees, comments shall be returned to the Design Engineer on the CSS website.

i. Plans requiring resubmittal for substantial changes as determined by City Engineer or Designee may require payment of an additional Plan Review fee.

D. After comments have been addressed and changes have been made the Design Engineer will submit the revised plan using CSS website.

i. If comments have not been addressed on plans submitted for final approval for construction the plans will be rejected.

ii. Plans will not be approved unless testing and inspection fees have been paid.

iii. If the design engineer does not submit plans for approval within 6 months of comments being issued or if fees are not paid within 6 months then the review will be terminated and the design engineer will have to start the plan review process over.

E. Upon approval, the city will return an electronic copy of the plan stamped “Approved for Construction” through the CSS web site.

i. The design Engineer will be required to submit two half size copies of the approved for construction stamped plans.

F. Final construction plans should not be submitted for Engineering Department approval for work that will not be installed within one year of the approval date. If construction does not start within one year plans will expire, and a new submittal will be required.

2.01.03 Fees

A. In accordance with City of Lubbock Ordinance Section 22.05.010 fees will be updated with the yearly budget cycle. A Schedule of fees will be available on the City of Lubbock – Engineering Department’s web site.

2.01.04 Checklist and Quantity Summary

A. A copy of the completed “City of Lubbock Municipal Water and Sewer Submittal Checklist” shall be submitted at the time of plan review submittal. The checklist can be found in the Appendix.

http://egovaccess.ci.lubbock.tx.us/EnerGov_Prod/SelfService/#/home

12 Section 2

B. A summary of quantities shall be submitted at the time of plan review submittal. The summary of quantities shall include length and size of pipe, number and size of fittings, number of hydrants and quantities of all other appurtenances.

2.01.05 Construction Plans

A. All plans to be used or kept on the job site shall be original or reproduced plan sets clearly marked “Approved for Construction” with the signature of reviewer and date approved by the Engineering Department.

B. Should circumstances during construction warrant changes from the approved plans or specifications, a written approval must be obtained from the Engineering Department.

i. Copies of the written approval shall be attached to the construction plans and maintained on the job site.

2.01.06 Record Drawings

A. The Design Engineer shall be responsible for recording constructed dimensions and information on a set of Record Drawings during the progress of construction.

B. Digital PDF “Record Drawings” certified by the Design Engineer shall be submitted to the Engineering Department on the CSS website within 30 days of completion of the construction.

i. Record Drawings shall include locations of all valves, valve vaults, fire hydrants, bends and tees or other changes in main pipe direction, material or size.

a. GPS Coordinates or property ties are acceptable.

C. Where the construction is phased and a lapse of more than 60 days occurs between phases, then Record Drawings shall be submitted to the Engineering Department reflecting the completed construction prior to issuance of the Certificate of Acceptance of Utility Construction.

D. If there are associated sewer and paving infrastructure, then all plans must be submitted for approval together.

E. Items required to be submitted with Record Drawings:

i. Record Drawing

ii. Updated Quantity Summary

iii. Developer’s Warranty Statement (See Appendix)

iv. Adjacent Mains Refund Contract (see Appendix)

2.01.07 Acceptance

A. Upon completion of construction, satisfactory system tests and submittal of Record Drawings, the Design Engineer shall request a final walk through of the project. After the final walk through is complete, the Design Engineer shall request a Certificate of Acceptance.

i. Water distribution system improvements shall not be put online or brought into service without approval from the Engineering Department.

ii. A newly constructed system will not be accepted until the supplying, adjacent system has been accepted.

iii. A Certificate of Acceptance of Utility Construction shall not be issued until Record Drawings are provided to the Engineering Department.

iv. When all paperwork has been completed and provided to the City with a written notification, utilities will be accepted within 30 days if there is no exception by the City.

Section 2 13

2.02 Plan Details

2.02.01 Plan Format

A. Standard drawing size shall be 22-inch by 34-inch.

2.02.02 The following information shall be shown on the plans:

A. General

i. Title Block (lower right hand corner preferred)

ii. Scale

iii. Original Date and Revision Dates

iv. Name of Professional Engineer

v. Professional Engineer's Seal

vi. Firm Name and Contact Information

vii. Owner’s Contact Information

viii. City of Lubbock Engineering Department Contact Information:

a. Development Services Engineering: (806) 775-2347

b. Senior Inspector: (806) 548-4152

ix. Drawings Number(s)

x. Legal Description of Property Being Improved

xi. Location Map or Plat (if available)

xii. Statement:

“All work shall be performed in accordance with the current version of the City of Lubbock Minimum Design Standards and Specifications.”

xiii. Note:

“Asbestos cement pipe will not be allowed to be disposed at the City of Lubbock Landfills - dispose of asbestos cement pipe in a legal manner”

B. Plan

i. Bench Marks

ii. North Arrow

iii. Property Lines

iv. Street Names and Easements with Width Dimensions

v. Other Pertinent Details (Buildings, Curbs, Water Courses, Etc.)

vi. Proposed Water Mains (Bold)

a. Stationing

b. Size

c. Length

d. Material and Type of Joints

e. Location Dimensions

f. Fittings

g. Tees

h. Crosses

i. Reducers

j. Bends

k. Plugs

14 Section 2

l. Blow-offs

m. Thrust Blocks

n. Valves

o. Fire Hydrants

vii. Existing Utility Lines (Gray) with Location and Depth According to the Following Standard:

C. Profile (required for water lines greater than 12-inch diameter)

i. Ground Surface - Existing (Dotted) and Proposed (Solid)

ii. Station Numbers

iii. Existing and Proposed Utilities Where Crossed

iv. Proposed Water Main Control Elevation and Grades

D. Plan, Profile and Complete Details for Off-Site Transmission Mains, Pump Stations, Special Valves and Vaults, Tanks, Etc.

E. Detail Sheet - As Required

i. Standard Bedding Detail

ii. Thrust Block and Joint Restraint Tables

iii. Fire Hydrant Detail

iv. Tapping Details

v. Air Valve Detail

vi. Blow-off Detail

vii. Crossing Detail

F. Overall Layout Sheet - If Required

i. Scale 1 "=100'

ii. Lot Lines

iii. Streets and Street Names

iv. Water Line Sizes and Material

v. Valves

vi. Fire Hydrants

vii. Connections to Existing System

Sewer Standards

Section 3 15

SECTION 3

MINIMUM DESIGN STANDARDS FOR SANITARY SEWERS

3.01 General

3.01.01 All sanitary sewer system design shall be in accordance with the requirements of TCEQ Chapter 217, AWWA Standards, City of Lubbock Sewer System Master Plan, current City ordinances and the City of Lubbock Minimum Design Standards for Sanitary Sewers.

3.02 Design Flow

3.02.01 The design of the sanitary sewer system shall be based on the following:

A. For sewers in new developments sewer main lines and lift stations shall be designed for the estimated future population to be served plus adequate allowance for future institutional and commercial flows.

B. Minimum flow capacity for sizing of sewers for peak flow conditions shall not be less than the following:

Design Criteria Design Value Units

Average Daily Flow 100 gpcd

Peak Factor, 2-hour flow 4 -

Capita per Household (Single Family) 3.2 persons

Capita per Household (Multi-family) 2.5 persons

C. Minimum residential population density shall be figured on a basis of 6 houses per acre, and 70 percent of total land area developed as residential, unless detailed analysis of the area to be served indicates differently.

D. Design flow for development other than residential use shall be based on the following or as directed by the City Engineer or designee:

Type of Development Design Criteria Daily Flow - gpcd

Trailer Park – transient 2.5 persons/trailer 50

Mobile Home Park 3 persons/trailer 75

School with cafeteria With showers 20

Without showers 15

Recreational Parks Day Use 5

Overnight Use 30

Commercial/Industrial Building 20

Motel 50

Restaurant Per meal served 5

Hospital Per bed 200

Nursing Home Per bed 100

3.03 Hydraulic Design

3.03.01 The minimum velocity at the design flow rate shall be 2.0 feet per second.

3.03.02 Maximum allowable velocity shall be 10 feet per second.

16 Section 3

3.03.03 Manning’s coefficient for design purposes shall be n=0.013 for PVC pipe.

3.03.04 Manhole inverts shall be designed in such a manner that the energy gradient is consistently falling in the direction of flow.

3.04 Design Details

3.04.01 Sewer Pipe

A. The standard pipe sizes that shall be used are 6-, 8-, 10-, 12-, 15-, 18- and 21-inch. Pipe sizes not listed here are considered non-standard and shall not be used in the City of Lubbock sanitary sewer system, unless approved by the City Engineer or designee.

B. The following City slope standards shall apply to sanitary sewer mains: (refer to TCEQ guidelines 30 TAC Section 217.53.1.2.A Table C.1.)

Pipe Diameter Minimum Slope (%) Maximum Slope (%)

6 inch 0.60 [0.50 TCEQ] 12.35

8 inch 0.40 [0.33 TCEQ] 8.40

10 inch 0.28 [0.25 TCEQ] 6.23

12 inch 0.22 [0.20 TCEQ] 4.88

15 inch 0.15 [0.15 TCEQ] 3.62

18 inch 0.12 [0.11 TCEQ] 2.83

C. Sewer main lines shall be straight between manholes both in line and grade.

D. All sewer main lines shall terminate in a manhole.

i. Cleanouts on sewer main lines shall not be permitted without written approval of the City Engineer or designee.

3.04.02 Manholes

A. Manholes shall be a minimum of 48-inch diameter and shall be provided at every change in direction, grade, or connection with other sewer main lines.

B. Manhole spacing and depth shall be as follows:

Pipe Diameter Manhole

Depth Manhole Diameter

Max. Spacing Between Manholes

15 inches or smaller 0-16 Ft. 48 in. 500 Ft.

15 inches or smaller Over 16 Ft. 60 in. 500 Ft.

Over 15 inches All depths 60 in. 800 Ft.

C. Manholes greater than 16 feet deep or serving pipes larger than 15 inches shall be 60-inch diameter and include a protective coating system per the Approved Materials List.

D. Connections at manholes shall be designed such that the crowns of connecting pipes are equal elevation if possible.

E. Force mains shall discharge directly into a manhole through a 90o downspout connection.

F. Manholes receiving force main discharge shall include a protective coating system per the Approved Materials List.

Section 3 17

G. Minimum elevation difference across manhole inverts shall be as follows:

Deflection Angle Between

Inlet/Outlet Min. Elevation Difference

Less than 30o 0.10 Ft.

Greater than 30o 0.20 Ft.

H. Drop manholes shall be provided for sewer main lines entering a manhole at an elevation 24 inches or more above the manhole invert.

i. Drop connections on new manholes shall be constructed with an exterior or “outside” drop system on all 48 inch manholes. All “outside” drops shall be flow filled against undisturbed soil up to the depth of the main.

ii. Drop connections on existing manholes shall be constructed with an interior or “inside” drop system. “Inside” drops shall be allowed for existing 60 inch manholes only.

I. Where the difference in elevation is less than 24 inches, the invert shall be filleted to prevent solids deposition.

J. Manholes shall be stubbed out with suitable size pipe wherever future extension of the sewer is anticipated.

i. Stub-outs shall extend beyond the edge of existing or proposed paving.

K. Inflow Prevention Devices (IPDs) shall be specified on all new manhole installations.

3.04.03 Service Connections

A. Tees or wyes shall be provided in sewer main lines for service connections at each lot or building site.

B. Service connections shall ordinarily be located 5.0 feet south or east of the centerline of the lot.

C. Service lines shall not cross property boundaries into adjacent private property without coverage by a dedicated easement.

D. Minimum size service connections shall be 4 inch diameter.

E. Maximum size service connection shall be no larger than one standard size smaller than the main to be tapped.

F. Size-on-size service connections are not allowed.

G. Gravity sewer taps shall connect to sewer main lines at or above the spring line.

H. No gravity service lines shall discharge directly into a manhole.

I. Service connections shall not be installed within 5 feet of the outside wall of a manhole.

3.05 Typical Layout

3.05.01 Unless approved otherwise by the City Engineer or designee, sanitary sewer mains shall be located:

A. In north-south alleys or streets, 5 feet east of the centerline.

B. In east-west alleys or streets, 5 feet south of the centerline.

3.05.02 Sanitary sewer mains to provide service connections shall be located within an alley or easement.

A. Service connections shall conform to typical utility locations in streets and alleys as per detail

18 Section 3 plates G1 thru G-1d unless written approval is provided by the City Engineer or designee.

B. Service connections shall not be deeper than 12 feet in an alley or easement or 20 feet in a street without prior written approval from the City Engineer or designee.

3.05.03 Where a sanitary sewer main crosses a street, the crossing shall be made at as near to perpendicular as possible.

3.05.04 Manholes shall be located as to provide access for maintenance crews and equipment.

A. Where possible, manholes in streets should be designed to fall outside of wheel paths.

B. Where possible, manholes in alleys should be designed to fall at the projected intersection of perpendicular lot lines.

3.05.05 In all instances sanitary sewer mains shall extend to the extremities of the platted property or the subdivision served.

3.06 Bedding and Cover

3.06.01 Sewer mains shall have a minimum of 4 feet of cover from top of pipe to proposed finished ground surface unless approved by City Engineer or designee.

A. Where less than 5 feet of elevation difference between the finished lot grade at building line and the top of the sewer main is provided, the plans shall indicate that the lot is served by a "shallow sewer" and appropriate elevation information shall be given.

B. Where a sewer main has less than 4 feet of cover, provisions shall be made to protect the pipe from impact loading when located in a street or alley.

C. Maximum sanitary sewer depth in alleys shall be 12 feet unless approved by the Engineering Department.

3.06.02 Pipe bedding and embedment shall be in accordance with the Standard Specifications for Sanitary Sewer Main Construction but in all cases shall be not less than manufacturer recommendations.

3.07 Relation to Water Mains

3.07.01 No physical connection shall be made between a drinking water supply and a sewer line.

A. Appurtenances shall be designed and constructed so as to prevent any possibility of sewage entering the drinking water system.

3.07.02 Sewers shall be located a minimum of 9 feet horizontally outside to outside from existing or proposed water mains.

A. Where the 9-foot separation distance cannot be achieved, the following guidelines shall apply:

i. New sanitary sewer installation – parallel lines:

a. Where a new sanitary sewer main parallels a water line:

(1) The sewer shall be constructed of ductile iron or PVC meeting ASTM specifications with a pressure rating for both the pipe and joints of 150 psi.

(2) The vertical separation shall be a minimum of 2 feet and the horizontal separation shall be a minimum of 4 feet between outside diameters.

(3) The sewer shall be located below the water line.

ii. New sanitary sewer installation – crossing lines:

Section 3 19

a. Where a sanitary sewer crosses under a water line and the sewer is constructed of ductile iron or PVC with a minimum pressure rating of 150 psi:

(1) An absolute minimum separation distance of 6 inches between outside diameters shall be maintained.

(2) One segment of the sewer pipe shall be centered on the water line such that the joints of the sewer pipe are equidistant and at least 9 feet horizontally from the centerline of the water line.

(3) Whenever possible, the crossing shall be centered between the joints of the waterline.

(4) The sanitary sewer main shall be embedded in flowable fill from one quarter of the diameter of the sanitary sewer main below the centerline of the pipe up to 12 inches above top of pipe for the total length of one pipe segment, minimum 9 feet in each direction from water line, plus 12 inches beyond the joint on each end.

b. Where a sanitary sewer crosses under a water line and the sewer is constructed of ABS truss pipe, similar semi-rigid plastic composite pipe, clay pipe or concrete pipe with gasketed joints (Non-pressure rated pipe):

(1) A minimum 2 foot separation distance between outside diameters shall be maintained.

(2) One segment of the sewer pipe shall be centered on the water line such that the joints of the sewer pipe are equidistant and at least 9 feet horizontally from the centerline of the water line.

(3) Whenever possible, the crossing shall be centered between the joints of the waterline.

(4) The sanitary sewer main shall be embedded in flowable fill from one quarter of the diameter of the sanitary sewer main below the centerline of the pipe up to 12 inches above top of pipe for the total length of one pipe segment, minimum 9 feet in each direction from water line, plus 12 inches beyond the joint on each end.

c. Where a sanitary sewer crosses over a water line:

(1) An absolute minimum separation distance of 1 foot between outside diameters shall be maintained.

(2) All portions of the sewer within 9 feet of the water line shall be encased in a joint of 150 psi pressure class pipe at least 18 feet long and 2 nominal sizes larger than the new conveyance.

(3) The carrier pipe shall be supported at 5-foot or less intervals with spacers.

(4) The encasement pipe should be centered on the crossing and each end sealed with watertight non-shrink cement grout or a manufactured watertight seal.

(5) Both the waterline and sanitary sewer main must pass a pressure and leakage test as specified in AWWA C600.

iii. The use of brown coloring in flowable fill for pressure rated sanitary sewer main embedment is recommended for identification during future construction.

iv. In all cases, suitable backfill or other structural protection shall be provided to preclude settling and/or failure of the higher pipe.

B. Sanitary sewer manhole and clean out separation from water

i. Manholes and clean outs must be installed so as to provide a minimum of 9 feet of outside to outside clearance from an existing or proposed water line.

ii. Where the 9-foot separation distance cannot be achieved, an encasement pipe as described in subparagraph (c.) above may be used for the water line.

20 Section 3

3.07.03 Water and sewer lines shall be installed in separate trenches.

3.07.04 For other instances not covered in these design standards, consult current TCEQ regulations.

3.08 Abandonment of Sewer Mains and Manholes

3.08.01 When a sewer system is to be abandoned the Design Engineer shall ensure that all existing mains and service connections are properly plugged or transferred to the new system prior to decommissioning of the existing system.

3.08.02 Sewer Mains

A. If a line to be abandoned terminates in a manhole that will remain in service, the existing main to be decommissioned shall be plugged from within the manhole and clearly marked on the plans.

i. Cutting and plugging of existing lines directly outside of manholes should be avoided.

B. If a portion of a line is to be abandoned a manhole must be installed on…