HomeMy WebLinkAboutR-2004-03 adopt portion of “PICM" relating to water system design criteria and improvements
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RESOLUTION NO. 2004- D 3
A RESOLUTION ADOPTING A PORTION OF THE "PUBLIC IMPROVEMENT
CRITERIA MANUAL" ("PICM") CALLED FOR IN ORDINANCE 1444 OF THE CITY
OF LA PORTE (THE DEVELOPMENT ORDINANCE OF THE CITY OF LA PORTE),
RELATING TO WATER SYSTEM DESIGN CRITERIA AND IMPROVEMENTS;
MAKING CERTAIN FINDINGS RELATING TO THE SUBJECT; FINDING
COMPLIANCE WITH THE OPEN MEETINGS LAW; PROVIDING A SEVERABILITY
CLAUSE; AND PROVIDING AN EFFECTIVE DATE.
WHEREAS, the City Council has directed the qualified professionals of the City's
staff to prepare a Public Improvement Criteria Manual, setting forth City Policy and
guidelines relating to the design and construction of certain Public Improvements within
the City of La Porte, by virtue of the passage of Ordinance 1444, otherwise known as the
Development Ordinance of the City of La Porte; and
WHEREAS, City Staff has developed a portion of said policy, relating to water
system criteria and improvements; and
WHEREAS, the Planning and Zoning Commission of the City of La Porte has
reviewed said policy (in the form attached hereto as Exhibit "2"), and has received public
comment on said policy at its meeting held on September 18, 2003, pursuant to due
notice, and
WHEREAS, the Planning and Zoning Commission recommends approval of said
Policy, in the form attached hereto as Exhibit "2;"
NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF LA
PORTE, TEXAS:
Section 1. The facts and matters set forth in the preamble of this Resolution
are hereby found to be true and correct.
Section 2. The portion of the PICM relating to Water System Design Criteria
and improvements, as set forth on Exhibit "2" attached hereto, is hereby adopted by the
City Council of the City of La Porte.
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Section 3. The City Council officially finds, determines, recites, and declares
that a sufficient written notice of the date, hour, place and subject of this meeting of the
City Council was posted at a place convenient to the publiC at the City Hall of the City for
the time required by law preceding this meeting, as required by the Open Meetings Law,
Chapter 551, Texas Government Code; and that this meeting has been open to the
public as required by law at all times during which this ordinance and the subject matter
thereof has been discussed, considered and formally acted upon. The City Council
further ratifies, approves and confirms such written notice and the contents and posting
thereof.
Section 4. In the event any clause, phrase, provision, sentence, or part of
this Resolution or the application of the same to any person or circumstance shall for
any reason be ajudged invalid or held unconstitutional by a court of competent
jurisdiction, it shall not affect, impair, or invalidate this resolution as a whole or any part
or provision hereof other than the part declared to be invalid or unconstitutional; and the
City Council of the City of La Porte, Texas, declares that it would have passed each and
every part of the same notwithstanding the omission of any such part thus declared to be
invalid or unconstitutional, whether there be one or more parts.
Section 5. This Resolution shall become effective after its passage and
approval, and it is so ordered.
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PASSED AND APPROVED, this January 26, 2004
CITY OF LA PORTE
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.fJ rman L. Malone,
Mayor
By:
ATTEST:
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Marth Gillett,
City Secretary
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EXHIBIT 2
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CHAPTER 3
WATER SYSTEM DESIGN CRITERIA
3.01 WATERDESIGNGENERAL
A. Criteria for the design of water service and water distribution lines are herein established.
All water lines constructed within the City of La Porte or its Extraterritorial Jurisdiction
(ETJ) shall follow these criteria and be in agreement with the City of La Porte
Comprehensive Plan
B. Design. construction and sizing of all water mains and appurtenances shall meet or
exceed the requirements of the Texas Commission of Environmental Quality (TCEQ) as
per 30 TAC 290 and Texas Board of Insurance (mI).
C. The public water system shall not extend beyond the individual water meter. All
waterline construction in public rights-of-way up to and including construction to the
water meter shall conform to these standards.
D. Design and construction shall conform to the City of La Porte construction details.
E. The "City of La Porte" for the purposes of these criteria shall consist of all land within
the city limits, and land located within the City's ETJ.
F. The final decision approving authority for the City of La Porte with respect to the water
system design criteria shall be the Director ofPlamring or his designated appointee.
3.02 DESIGN REQUIREMENTS
A. Obtain approval from the Director of Planning of his designated appointee for exceptions
or deviations from these requirements. Exceptions or deviations may be given on a
project by project basis.
B. Lines:
1. Locate water lines within street rights-of-way, or appropriate utility easement:
a. No 2-inch water mains are allowed.
b. Four-inch mains shall only be used with special approval of the
Director of Planning or his designated appointee, shall selVe no more
than 16 residential lots, and shall be supported on both ends by an 8-
inch water main or larger. A dead end 4-inch main may supply a
maximum of 10 lots, shall not exceed 400 feet in length and shall
terminate with a blow off. Fire hydrants are not allowed on a 4-inch
main.
c. Six-inch interconnectedllooped mains shall only be used with special
approval of the Director of Planning or his designated appointee, shall
be a maximum of 800 feet long, and shall be supported on both ends by
an 8-inch main or larger. Dead end 6-inch mains shall not be more than
six hundred feet (600') in length and shall terminate with a blow-off.
Fire hydrants are not allowed on a 6-inch main.
d. Except when 4-inch and 6-inch diameter lines are permitted under the
above criteria, all water lines shall have a minimum diameter of 8-
inches when such runs are used for lines less than 1000 feet long or
when such water lines are required to have a fire hydrant or flushing
valve.
e. Ten inch diameter water line is not permitted.
f. Pipe with a 12-inch diameter should be used for lines greater than 1000
feet in length.
g. Dead-end lines:
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(2)
Dead-end lines shall be avoided and may only be considered
when a looped or interconnected water main system is not
nearby. Such dead-end lines shall only be installed when
special approval from the Director of Planning or his
designated appointee is obtained.
The design of all water distribution systems should include the
opportunity for future looping or interconnect of any approved
or proposed dead-end line.
Dead-end lines within public right-of-way:
(1)
(3)
(a) On pennanent dead-end lines not serving residential
cul-de-sacs, the line shall be 8 inches in diameter and
shall not exceed more than 700 feet in length from
the closest interconnection main line and shall
tenninate with a fire hydrant, flushing valve or blow-
off valve.
(b) In temporary dead-end situations or if the possibility
for future extension of the water line exists do not
reduce pipe sizes successively. Carry 8-inch
diameter pipe to the last appurtenance or the plug.
Place the last service as near as possible to the end
and install a standard blow off valve and box at the
end of the 8-inch diameter line. The maximum
length of such a line shall be 700 feet.
(c) In unavoidable pennanent dead-end situations,
reduce the sizes of pipe successively. Carry an 8-
inch pipe to the last fire hydrant, then use 4-inch pipe
to the end of the line and lay 4-inch line in
accordance with Section 3.02B.l.b. Provide a
standard two-inch (2") blow off at the end of the
main.
(d) Isolate dead end lines with a line valve.
(4) Water lines located in a public easement on private property
in non-single family residential applications with 1 or more
fire hydrants or flushing valves shall be 8-inch diameter with
interconnection to at least 2 supply sources when possible.
(a) Appropriately sized domestic service shall be taken
from the 8-inch lines.
(b) The design engineer shall submit water/hydraulic
modeling data to the Director of Planning or his
designated appointee demonstrating that adequate
water pressures can be maintained given projected
water demand in non-single family residential
applications.
(c) The design engineer shall submit water/hydmulic
modeling data to the Director of Planning or his
designated appointee demonstrating that fire flow
capacity is available for the non-single family
residential applications.
h. Water line placement in side lot easements shall not be allowed except
by special approval of the Director of Planning or his designated
appointee. Where side lot easement water do receive special approval
they may be lain in a continuous steel casing pipe. When such casing is
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required by the City of La Porte, extend the casing uninterrupted from
building line to building line. No horizontal or vertical deflections are
allowed. Construct encased water line of ductile iron or restrained joint
bell and spigot pipe to prevent lateral movement. Provide and install
casing spacers and end seals. This item shall only apply to publicly
maintained lines.
2. The use of steel pipe for use as a water line transmission pipe is prohibited.
Steel pipe shall only be used for water line casings only.
3. Water Line Testing: All newly installed water lines shall be designed to hold
125 psi hydrostatic pressure for 4 hours. If a leak is detected within that 4 hours,
an 8 hour test shall be required. Hydrostatic tests shall be performed per
A WW A standard specifications for installation of cast iron water main C-600.
4. Chlorination: All newly insta1led water lines shall have to pass bacteriological
testing before being accepted for maintenance by the City of La Porte. The City
will conduct the bacteriological testing. The City will pay for passing tests and
the developer/contractor shall be responsible for the cost of failed tests.
C. Location (See Table 3.1)
1. Boulevard streets: If approved, public water lines, may be located within the
esplanade. Water lines should be located as near the centerline as possible to
avoid conflict with future pavement widening. The lines should be located in
the street right-of-way to avoid conflict with future pavement widening.
2. Locations within an easement: Locate water lines in the center of a 10-foot
minimwn width dedicated water line easement For location within side lot
easements, the minimwn easement width shall also be 20 feet. The Director of
Planning or his designated appointee may require a wider easement if the line is
to be buried more than 8 feet deep from natural ground surface at any point in
the easement. Obtain approval from the City of La Porte for lines to be located
in smaller or multi-use easements.
3. When a water line is placed parallel to but not crossing any other proposed or
existing utility line, other than a sanitary sewer, the water line shall have a
minimwn of 4 feet horizontal clearance from the outside wall of the existing
utility to the outside wall of the proposed waterline. Any proposed deviation
from these criteria must first be approved by the Director of Planning or his
designated appointee.
4. A minimum distance of 2 feet shall be maintained from the right-of-way or
easement line to the outside edge of the water line.
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Table 3.1
WATER LINE LOCATION WI.THlN A STREET RIGHT-OF-WAY
RIGHT-OF-WAY WIDTH & EXISTING OR 8" & SMALLER 12" & LARGER
ANTICIPATED CURB FACE TO CURB FACE (1) (2) (3) (I) (2) (3)
PAVING WIDTH
tOO-FOOT ROW ALL STREETS: S feet 7 feet
SO-FOOT ROW ALL STREETS: 7 feet 6 feet
60-FOOT ROW ALL STREETS:
MAJOR THOROUGHFARE: 44 feet 5 feet 5 feet
COMMERCIAL, SCHOOL, PARK: 40 feet 7 feet 6 feet
RESIDENTIAL: 27 feet 12 feet''') 12 feet(4)
(I) The numbers listed in the right two columns of Table 3.1 are the maximum allowable distance
from the right-ofway to the centerline of the proposed water line.
(2) The minimum distance from the right-ofway line to the centerline of the proposed water line shall
be 5 feet without a water line easement adjacent to the right-ofway.
(3) All distances arefrom back of curb.
(4) Investigate the possibility of afuture 35-foot curb face to curb face curb and gutter street section
to replace an existing street with roadside ditches and place the waterline the appropriate
distance behind the future curb.
D. Depth of Cover (See Table 3.2)
I.
Provide the minimum depths of cover shown in Table 3.2 from the top of natural
ground behind the curb for curb-and-gutter streets, or from the lowest elevation
of the nearby ditch bottom for roadside ditch street sections whichever is
applicable unless a variation is granted by the Director of Planning or his
designated appointee.
Whenever possible, changes in grade or alignment to clear utilities or
underground features should be accomplished by deflecting pipe joints. The
max.imum designed deflection shall be Y2 of the manufacturer's allowable
deflection. The use of regular bends for any change of grade shall not be
allowed except when prior approval is obtained from the Director of Planning or
his designated appointee.
Ifa depth greater than 8 feet or less than 4 feet to the top of the pipe is proposed,
a ductile iron or other comparable high hoop strength material pipe shall be used
and continued for all areas the depth of cover exceeds 8 feet or is less than 4
feet.
2.
3.
a. All transitions from ductile iron pipe to approved water main materials shall
be constructed using electrically isolated flange joints.
b. Ductile iron or other comparable high hoop strength material pipe shall be
constructed in accordance with City of La Porte construction details for
water lines.
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Water System Design Criteria Page 4 of 13
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Table 3.2
DEPTH OF COVER FOR WATER LINES
SIZE OF LINE DEPTH OF COVER.
TOP-OF-CURB OPEN-DITCH
8-INCH & SMALLER 4 FEET I 5 FEET below ultimate flowline
12-INCH & LARGER 5 FEET I 5 FEET below ultimate flowline
.When crossing easements whose owning or governing agenc.y has stricter depth of cover criteria than that
shown in Table 3.2, the stricter of the two shall apply. Where other agencies have review authority or
jurisdiction and have different depth of cover requirements, the stricter of the two shall apply.
E. Appurtenances
1. Do not place appurtenances in pavement when the appurtenance would be
covered in whole or in part by pavement. Gate valves may be placed in
sidewalks or paved roadways provided that the top of the valve box is flush with
the finished pavement.
2. All water system valves shall conform with A WW A standards and shall include:
a. Cast iron valve boxes are required on all valves less than 12 inches.
Valve vaults are required on all valves 16 inches and larger.
b. All valves shall be sized to equal the size of the water main on which it
is located.
3. Valves
a.
Spacing - set at maximum distances along the water line as follows:
(1)
(2)
(3)
(4)
b. Location
(I)
8" & Smaller - 1000 feet
12" & Larger - 2000 feet
The total number of valves at any water line intersection shall
equal the total number of Jines leading out from the
intersection point minus one.
Tapping Sleeve & Valve - Sleeve and bolts shall be stainless
steel.
(2)
Normally, locate valves at street intersections along the street
right-of-way lines projected across the water line where
possible. Tapping sleeve and valves are excluded from this
requirement.
Isolate fire hydrants and flushing valves from the service main
with a valve located in the fire hydrant or flushing valve
branch. This valve should not be located in the slope or
flowline of roadside ditches.
Intermediate valves, not located on the projection of the right-
of-way line, shall be located on the water line 5 feet from a
tire hydrant but shall not be set in a driveway.
Locate valves a minimum of 10 feet horizontally away (either
direction) from any sanitary sewer crossing.
Valves located near reducers shall be located on the smaller
diameter pipe.
All water mains shall be valved within the street right-of-way.
(3)
(4)
(5)
(6)
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Water System Design Criteria Page S or 13
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(7)
Valves shall not be placed under or within 2 feet of ultimate
pavement, when it is known that the street will be widened in
the future, without prior approval of the City of La Porte.
Valves shall be placed at the end of all water mains that are to
be extended in the future and the main shall be extended a
minimum of one pipe joint past the valve.
c. Valve Type
(1) 12" & smaller - Resilient seated, corrosion resistant, Gate
valves, meeting A WW A C509, counter-clockwise opening
with mechanical joints
(2) 14" & larger - Butterfly valves meeting AWWA C504, with
corrosion resistant coating. All Butterfly valves shall be
installed in a vault of adequate size & construction subject to
approval by the Director of Planning or his designated
appointee.
4. Fire Hydrants and Flushing Valves
a. Spacing
(I) Single family residential development - 500 foot maximum
spacing.
(2) AU other development - 300 foot spacing.
b. Location in or along street right-of-way
(I)
(2)
Locate fire hydrants primarily at street intersections.
Locate fire hydrants at the end of a curb radius of a street
intersection, 3 feet behind back of curb or projected future
curb in a curb & gutter road construction application.
On streets with roadside ditches, set the fire hydrants within 5
feet of rights-of-way lines. Fire hydrant lead valves should
not be located in the slopes or flow lines of ditches.
Set fire hydrants not located at intersections or block comers
on lot lines, as extended to pavement, when located between
right-of-way intersections. These locations may be adjusted 5
feet either way to avoid driveways or obstructions. In either
case, do not locate fire hydrants closer than 5 feet from
driveways.
Fire hydrants are not allowed in esplanades of streets.
On all Texas Department Transportation (TXDOT) rights-of-
way, set the tire hydrants and flushing valve set-backs from
the edge of edge of right-of-way shall adhere to TXDOT
criteria.
Investigate the possibility of a future 35-foot face-to-face
curb-and-gutter section to replace existing streets roadside
ditches.
(3)
(4)
(5)
(6)
(7)
c. Location of fire hydrants or flushing valves outside street rights-of-way
and in public easements:
(1)
The City will review and approve all submitted locations of
fire hydrants and flushing valves in all developments within
the City of La Porte and its ETJ.
Water System Design Criteria Page 6 of 13
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(2)
(3)
Locate fire hydrant and flushing valves in protected, easily
accessible areas behind curb lines.
For tire hydrants or flushing valves that are located adjacent to
water Jines constructed in 10 foot wide water line easements,
the fire hydrant or flushing valve shall be centered in a
minimum 15 foot by 15 foot separate easement.
For non-residential developments in the City of La Porte and
its ETJ, provide isolation valves at each end of fire loops
requiring on-site tire hydrants.
(4)
d. Fire hydrant leads shall be designed to have a minimum 4 foot bury
where possible. Bends or offsets in a fire hydrant branch should not be
used. Bends may be used on the water main and not the fire hydrant
branch to maintain a 4 foot bury or a 3 foot back of curb set-back.
The lower horizontal flange of, a tire hydrant shall not be more than 6
inches above the surrounding natural ground at any point.
The bottom of the Hydrolock connection shall not be less than 18
inches from the surrounding natural ground.
All fire hydrants installed in the City of La Porte and its ETJ shall be
Mueller Super Centurion 250 or American Darling or approved equal.
All tire hydrants installed in the City of La Porte and its ETJ shall have
a Hydrolock quick-connect 5 inch steamer connection facing the
nearest main street.
Do not install file hydrants within 10 feet vertically or horizontally of
sanitary sewers and force mains.
Fire hydrant restraints - EBAA Iron Series 1500 force restraint sleeves
for pipe joints or approved equal.
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, 5. Fittings
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a.
Fittings shall be Ductile Iron Compact Fittings (2 inch to 12 inch),
AWWA CI53/A21.53.84, conforming to the minimum requirements of
"Gray-Iron and Ductile-Iron Fittings." For fitting of 14 inches through
48 inches used on water mains, A WW A ClIO (ANSI 21.1 0) or current
revision shall govern. Fittings shall be furnished with bituminous or
cement mortar lined AWWA CI04 (ANSI A21.4). Properly designed
thrust blocks shall be provided for each fitting where necessary and in
accordance with City of laPorte standard construction details. At each
fitting there shall be EBAA Iron Series 1500 force restraint sleeves for
pipe joints or approved equal.
b. Use plugs with retention clamps and carrying the designation "plug and
clamp." Thrust blocking is required for dead-end lines that are
plugged.
c. All water main joints shall be push on joints. Mechanical joints should
not be used in underground applications without prior approval of the
Director of Planning or his Designated appointee. Mechanical joints
may be used for above ground waterline installations.
d. All fittings are to be double wrapped in 6 mil plastic.
6. Ductile Iron Pipe
a.
b.
January 2004
Ductile iron pipe shall be provided with polyethylene encasement.
Provide minimum 2 wraps of 8-mil polyethylene, or
Polyethylene tube encasement shall conform with the minimum
requirements of "Polyethylene Encasement for Gray and Ductile Cast
Iron Piping for Water and other Liquids," ANSl'AWWA C-I05,
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current revision. Soils within the project shall be tested to adequately
determine the requirements of the encasement. Appendix A of
ANSI! A WW A C-I05 shall be consulted where questions regarding soil
conditions and encasement arise.
F. Water Meter Service
1. All water meters 2 inches and smaller shall be installed by the City of La Porte.
2. Vaulted water meter installation shall be undertaken by private contractors with
prior approval from the City of La Porte.
3. Stub outs for future water service are not allowed except where part of a
preapproved master plan, site plan development plan or track development plan.
4. Minimum size water service line and tittings shall be % inch meter with % inch
stop at the meter for any single connection for residential homes. The City of La
Porte Building Inspections Department should be consulted to ensure the proper
sized meter is selected for any proposed service.
5. Water service leads from the water main to the water meter shall be placed at a
minimum 4 foot below final paving elevations.
6. Water meters shall be % inch to 2 inch displacement type, magnetic drive, cold
water meters.
7. Meter boxes shall be located just within the public right-of-way along the
projection of a lot line. Location of meters in the ditch of open ditch streets
shall be avoided. Meter boxes shall be installed no more than 2 inches above
final natural ground.
8. Back-flow prevention devices shall be installed in line on the private water
meter service line on all commercial developments, irrigation metered service,
and shall be installed in aU applications where the City of La Porte's Plumbing
Code and its latest revision so requires.
G. Water Line Crossings within the City of La Porte
I. Public and private utility crossings other than sanitary sewer: Where a water line
crosses another utility other than a sanitary sewer, a minimum of 6 inches of
clearance must be maintained between the outside wall of the water line and the
outside wall of the utility.
2. Stream or ditch crossings
a. Elevated crossings
(I) Water lines shall be ductile iron pipe or other comparable high
hoop strength material and shall extend a minimum of 15 feet
beyond the last bend or to the right of way line, whichever is
greater.
(2) Elevated crossings are preferred to underground crossings.
(3) Use a separate elevated supporting structure for 12 inch and
larger water lines. Locate structures a minimum of 10 feet
from any existing or proposed structures.
(a)
Adequate structural capacity shall have been
calculated and provided for including considerations
for pipe deflection and all applicable loading.
Clearance for maintenance purposes above bent cap
elevation shall be provided where elevated water
lines are to be run under bridges.
(b)
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Water System Design Criteria Page 8 of 13
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(4)
When approved by the Director of Planning or his designated
appointee, bridge attachments for elevated water line crossings
may be made instead of separately supported crossings.
Design elevated crossings with the elevation of the bottom of
the water line 2 feet above the 100-year floodplain elevation
Create a high point in the elevated stream or ditch crossing
and provide an air release valve at that highest point of the
water line.
Provide sufficient span length to accommodate the cross
section of future widening of the stream or ditch to ultimate
cross section.
Base the columns' support designs on soil capacity, spacing,
loading, and all pertinent structural requirements.
Spacing of supports shall consider effect of support on channel
hydraulics and be subject to city approval.
Provide pedestrian pipe guards on elevated crossings. The
Planning Department can be contacted for this detail.
(5)
(6)
(7)
(S)
(9)
(10)
b. Underground Crossings
(I) Provide a minimum 5 foot clearance from the top of the
pipeline to the ultimate flow line of the ditch.
(2) Provide sufficient length to exceed the ultimate future
development of the stream or ditch.
(3) Water lines shaH be C-900 or ductile iron pipe and shall
extend a minimum of 15 feet beyond the last bend or to the
right of way line, whichever is greater.
(4) Where other agencies have review authority or jurisdiction
and have different underground crossing requirements, the
stricter of the two shaH apply.
3. State Highway and County Road Crossings
a. Extend carrier pipe from right-of-way to right-of-way
b. In cases where the State of Texas or Harris County shall have review
powers, the use of any and aH materials and the design thereunto
appertaining shall be governed by their requirements. The approval of
the design by the appropriate governmental agency shall be sought,
obtained and demonstrated to the City of La Porte before plans will be
approved.
c. Where additional right-of-way has been acquired for future widening,
the casing shaH extend 5 feet beyond each right-of-way line.
4. Railroad Crossings
a.
For mainline and spurHne railroad crossings, the water line shall meet
the requirements of the governing agency and such requirements shall
be followed from 5 feet beyond each right-of-way line and across the
right-of-way itself. Any deviation must be approved by the railroad
companies. The approval of the design by the appropriate governing
agency shall be obtained and demonstrated to the City of La Porte
before plans will be approved.
Where there is no railroad but a railroad owned easement or right-of-
way, as a minimum extend a steel casing from right-of-way to right-of-
way line.
b.
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c.
The approval of the design concept by the railroad involved must be
obtained and demonstrated to the City of La Porte before plans will be
approved.
5. Additional Requirements
a. Use isolated flange joints for transitions between two dissimilar
metallic pipes. Isolate water lines from casing with spacers and
supports.
b. The carrier pipeline shall extend a minimum of I-foot beyond the end
of the casing to allow flanged joints to be constructed if necessary.
6. Oil and Gas Pipeline Crossings
Use PVC pipe when crossing a non-service transmission pipelines regardless of
depth. All non-service transmission pipeline crossings must have the approval
of the company whose lines are being crossed. Maintain a minimum 2 foot
vertical separation between the pipeline and the water line.
7. Fireflow Waterline Loops within Non-Residential Developments
For non-residential developments inside the City of La Porte and requesting on-
site water mains, comply with the following requirements to allow maintenance
and future repair operations if the City of La Porte will be the entity maintaining
the water main:
a. Where approved by the Director of Planning or his designated
appointee, if there is placement of paved parking or paved private
drives over the installed water line then the City of La Porte is not
required to replace or repair paving or paved areas when such paving is
disturbed by needed water line repairs.
b. Avoid laying any new water lines under proposed or existing pavement
but where unavoidable, provide minimum 20 foot interval longitudinal
expansion or construction joints in the easement over the water line.
c. Fireflow waterline loops within non-residential developments that are
to be maintained by the City of La Porte shall be placed in a water line
easement that shall be given, conveyed, granted or dedicated to the
City.
d. There shall be no structures or equipment pads constructed over a
publicly maintained water line.
H. Auger Construction: Use the following general criteria for establishing auger, bore and
jack, or microtunneling sections when site conditions require their use:
1. Improved streets - Use auger or microtunneling construction to cross a street
regardless of surface. Auger or microtunneling length shall be computed as
roadway width at the proposed bore location plus a minimum of 10 feet to either
side of roadway.
2. Driveways - Use auger or microtunneling construction to cross improved
driveways. Bore and jack, auger or microtunneling length shall be a minimum
of the driveway's width.
3. The City of La Porte Planning Department shall be consulted for a auger
pitlbore pit backfill details.
I.
Circulation and Flushing for Water Quality: The layout of the water distribution system
shall provide for maximum circulation of water.
January 2004
Water System Ueslgn Lntena page JU ot Jj
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L. Provide a source of fresb water at each end or at multiple points ofa subdivision
or development. Provide ways to create circulation and place valves and fire
hydrants to allow simple flushing of lines.
2. Where stubs are provided for future extensions, isolate the stubs with a valve
and no service connections will be allowed beyond the valve before the line is
extended. .Place one full joint of pipe between the valve and the plug.
J. New Water Lines Constructed Near Sanitary Sewers and Force Mains and Manholes
L. New Water Lines Parallel to Sanitary Sewer and Force Mains: Locate water
lines a minimum of 10 feet horizontally, outside wall to outside wall, when
parallel to sanitary sewers and force mains. Use the following procedure when
site conditions prohibit achieving 10 feet of separation. When the 10 foot
separation cannot be achieved the approval of the Director of Planning or his
designated appointee must be obtained:
a. When a new water line is to parallel an existing sanitary sewer force
main or gravity sewer and the 10 foot minimum separation cannot be
achieved, the existing sanitary sewer shall be replaced with lined
ductile iron pipe, SDR-26 with pressure gaskets, or PVC C-900 150 psi
pipe or better and equipped with pressure type joints.
b. The water lines and sanitary sewer shall be separated by a minimum
vertical distance of 2 feet and at least 4 feet horizontally (per 30 T AC
290.44) measured between the nearest outside walls of the pipes, where
the water line shall always be located above the sewer.
2.
New Water Lines Crossing New and Existing Sanitary Sewers and Force Mains
a. No protection is required if the sanitary sewer is 10 feet below the
water line.
b. Use the protective requirements given in Table 3.3 and 3.4 for sanitary
sewer crossings not 10 feet below the water line.
3. Sanitary Sewer Manholes: Provide a minimum 10 foot horizontal clearance from
outside wall of existing or proposed manholes, make manholes and connecting
sewers watertight and test for leakage. If a 10 foot clearance cannot be obtained,
the water line may be located closer to the manhole when prior approval has
been obtained from the Planning Director or his designated appointee by using
one ofthe procedures below; however, in no case shall the clearance be less than
4 feet.
a.
The City of .La Porte may require the water line may be encased in a
casing when site conditions dictate or when the water line is within 5
feet of a manhole. The carrier pipe shall be a minimum of I joint of
150 psi pressure class pipe at least 18 feet long and two nominal sizes
larger than the water conveyance pipe.
The water line may be augured, bore &jacked, or microtunneled past
the manhole with at least one 18 foot section of 150 psi pressure pipe
installed centered about tbe existing sanitary manhole with pressure
grouting of the annular space using a bentonite/clay mixture or other
commercial grouts.
b.
January 2004
Water System Design Criteria Page 11 of 13
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Table 3.3
WATER LINE - SANITARY SEWER CROSSINGS
PROPOSED WATER
PRIMARY PROPOSED WATER PROPOSED SANITARY
CONDITION EXISTING SANITARY OR
EX.ISTING WATER
PROPOSED SANITARY
SECONDARY WATER OVER WATER UNDER WATER OVER WATER UNDER
CONDITIONS SANITARY SANITARY SANITARY SANITARY
Less Greater Less Greater Less Greater Less Greater
IF THE than 2' than 2' than 2' than 2' than 2' than 2' than 2' than 2'
CLEARANCE IS but less but less but less but less
than 10' than 10' than 10' than 10'
.Protection 1 2 3 4a or 4b 5 6a 3 6b & 6c
Requirement
.PROTECTION REOUIREMENTS FOR SANITARY SEWER CROSSINGS
(All clearances shall be measured from outside wall to outside wall)
1. One 20-footjoint ofC-900 or C-905 PVC, 150 psi centered over sanitary sewer; 6-inch minimum
clearance.
2. lfno evidence of sanitary sewer leakage, center one joint of water line over sanitary sewer; 24-
inch minimum clearance. If the sewer line is leaking, the sewer line shall be replaced with 150 psi
lined ductile iron pipe or other approved pressure pipe with appropriate adapters on all portions
of the sanitary sewer within 10 feet of the water line.
3. Not allowed.
4. a. Auger, bore & jack or microtunnell 0 feet minimum each side of sanitary sewer. Place
one 20-foot joint of C-900 or C905, 150 psi, centered under sanitary sewer. Fill bore
hole with bentonite/clay mixture or grout; 2 foot minimum clearance.
b. OR replace the existing sanitary sewer with 150 psi lined ductile iron pipe, C-900 or
other approved pressure pipe with appropriate adapters on all portions of the sanitary
sewer within 10 feet of the water line.
5. Minimum 18 foot joint of sanitary sewer, 150 psi lined ductile iron pipe, C-900 or other approved
pressure pipe centered at the water line, 6 inch minimum clearance. Also center an 18 foot joint
of waterline over the sanitary sewer line. The sanitary sewer line shall be embedded in cement
stabilized sandfor one pipe segment plus I foot beyond each joint.
6. a. Center a minimum 18 foot joint of sanitary sewer, 150 psi, lined ductile iron pipe, C-900
or other approved pressure pipe on water line.
b. Use cement stabilized sand backfill for all portions of the sewer within 10 feet of the
waterline, as measured perpendicularly from any point on the water pipe to the
wastewater pipe (minimum 2.5 sacks cement per cubic yard of sand). The cement-
stabilized sand bedding shall start at a point 6 inches below the bottom of the sanitary
sewer to 6 inches above the top of the sanitary sewer and one quarter of the pipe
diameter on either side of the sewer.
c. Center a minimum J 8 foot joint of waterline on the sanitary sewer line.
January 2004
Water System Design Criteria Page 12 of 13
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Table 3.4
PROTECTION REQUIREMENTS AT
WATER LINE - FORCE MAIN CROSSINGS
PROPOSED WATER
PRIMARY PROPOSED WATER PROPOSED FORCE MAIN
CONDITION EXISTING FORCE MAIN OR
EXISTING WATER
PROPOSED FORCE MAIN
SECONDARY WATER OVER WATER UNDER WATER OVER WATER UNDER
CONDITIONS FORCE MAIN FORCE MAIN FORCE MAIN FORCE MAIN
Less Greater Less Greater Less Greater Less Greater
IF THE than 2' than 2' than 2' than 2' than 2' than 2' than 2' than 2'
CLEARANCE IS but less but less but less but less
than 10' than 10' than 10' than 10'
*Protection 1 2 3 4a or 4b 5 6a 3 6a & 6b
Reauirement
J
*PROTECTION REOUlREMENTS FOR FORCE MAIN CROSSINGS
(All clearances shall be measured from outside wall to outside wall)
J.
Construct waterline with a 20-loot ductile iron section with all related appurtenances centered
above theforce main; 6-inch minimum clearance.
Construct water line with one 20footjoint ofC-90b, C-905 PVC centered above theforce main.
Not allowed.
a. Auger, bore &jack or microtunnell0feet minimum each side offorce main. Place one
10-loot joint of C-900 or C905. 150 psi, centered under sanitary sewer. Fill bore hole
with bentonite/clay mixture or grout; 2 foot minimum clearance.
b. OR replace the existingforce main with 150 psi lined ductile iron pipe with appropriate
adapters on all portions of the force main within J 0 feet of the water line.
Center a minimum 18 foot joint of force main, 150 psi lined ductile iron pipe under water line and
use cement-stabilized sand backfill for all portions of the sanitary sewer force main with 10 feet of
the water line as measured perpendicularly from any point on the water pipe to the sanitary sewer
force main pipe (minimum 2.5 sacks cement per cubic yard of sand). The cement-stabilized sand
bedding shall be from a point 6 inches below the bottom of the sanitary sewer force main to 6
inches above the top of the sanitary sewer force main and one quarter of the pipe diameter of the
sanitary sewer force main on either side of the sanitary sewer force main.
Minimum 18 foot of sanitary sewer force main, 150 psi lined ductile iron pipe centered at the
water line.
2.
3.
4.
5.
6.
3.03 QUALITY ASSURANCE
A. Prepare calculations and drawings prepared under the supervision of a Texas Professional
Engineer trained and licensed under the disciplines required by the nature of the
drawings. The final design drawings, must be sealed, signed and dated by the
Professional Engineer responsible for development of the drawings.
B. For Elevated Stream and Ditch Crossings: .Prepare design calculations for support
columns and column spacing.
3.04 EXTRA TERRITORIAL JURISDICTION
The criteria herein described in this chapter shall be applicable to all water main and appurtenance
construction and all devices thereunto related within the ETJ of the City of La Porte except where
specifically denied or where specific exemptions for the ETJ have been enumerated.
January 2004
Water System Design Criteria Page 13 of 13
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REQUEST FOR CITY COUNCIL AGENDA ITEM
Agenda Date Requested:
Janua" 26. 2004
Appropriation
Requested By: Nil"k FinSlln
Source of Funds:
Department: Plaaaiag
Account Number:
Report:
Resolution: X Ordinance:
Amount Budgeted:
Exhibits:
1.
Resolution
Amount Requested:
Exhibits:
2.
Water System Design Criteria
Budgeted Item: YES NO
Exhibits:
SUMMARY & RECOMMENDATION
The City has been working to improve and refine the City of La Porte's water distribution system design criteria.
Standardization of design criteria of public water distribution systems simplify and insure quality water services
systems that are constructed to be both effective and capable of safely supplying enough capacity to accommodate
population growth. As part of the ongoing outreach efforts to involve the citizens in their local government, a
voluntary public hearing on the water system design criteria was held before the Planning & Zoning Commission to
receive public input on September 18,2003. A separate voluntary Public Hearing will be held at the January 26,
2004 La Porte City Council meeting. Another part of this outreach program entailed the distribution of the proposed
criteria to various engineering consultants including Lockwood, Andrews & Newnam, Inc., Claunch & Miller,
Windrose Services, Klotz & Associates, Inc., PBS&J, Brown & Gay, Inc., local developer Eddie Gray, H. Carlos
Smith, and LJA Engineering. Comments were received from Windrose Services, and Claunch & Miller. Internally,
the proposed design criteria was reviewed by Curtis Herrod of the Public Works Department, Mark Huber of the
Inspections Department, Reagan McPhail of the Planning Department and Assistant City Manager John Joerns. The
proposed water system design criteria will become Chapter 3 of the Public Improvements Criteria Manual (PICM).
Currently PICM consists of Chapter 4 which governs the design of public wastewater collection systems, Chapter 5
which deals with the design of stonn sewer drainage systems, and Chapter 6 which deals with the design of public
streets and sidewalks. The need for a full and complete PICM stems from the Development Ordinance which refers
to PICM as being the location for applicable design criteria for use in the design of public systems.
At its September 18, 2003 meeting the La Porte Planning & Zoning Commission solicited and received public
comment on the proposed Water System Design Criteria. The Commission voted at that meeting to recommend
approval of the proposed Chapter 3 to the City Council.
Action Required bv Council:
Conduct public hearing to receive citizen input on the proposed Water System Design Criteria and consider
approving a resolution adopting the Water System Design Criteria Chapter of the Public Improvements Criteria
Manual.
ADDroved for City Council Ae:enda
cxtJ1Jw
/ -/ d-O~ Df
Date
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THE STATE OF TEXAS ~
COUNTY OF HARRIS ~
CITY OF LA PORTE ~
NOTICE OF PUBLIC HEARING
In accordance with the provisions of Section 106-171 of the Code of Ordinances of the City of La
Porte, and the provisions of the Texas Local Government Code, notice is hereby given that the
City Council will conduct a public hearing at 6:00 p.m. on the 26tb day of January 2004 in tQ.e
City Hall's Council Chambers, 604 West Fairmont Parkway, La Porte, Texas. The purpose of the
public hearing is to receive citizen input on the proposed Chapter 3 - Water System Design
Criteria, which will serve as an addition to the current Public Improvements Criteria Manual
(PICM).
A regular meeting of the City Council will follow the public hearing to act upon the public
hearing items and to conduct other matters pertaining to the Council.
Citizens wishing to address the Council pro or con, during the public hearing, are required to sign
in before the meeting is convened.
CITY OF LA PORTE
Martha Gillett
City Secretary
This facility has disability accommodations available. Requests for accommodations or interpretive services at
meetings should be made 48 hours prior to the meeting. Please contact City Secretary's office at (28/) 471-5020
or TDDLine (28/) 471-5030for further information.
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EXHIBIT 1