vent.
(E) Plastic lines. Plastic lines shall be encased within
the right of way on crossings, and must have at least 30 inches of
cover.
(F) Aboveground appurtenances. Except for vents, no
above ground utility appurtenances for gas lines shall be permitted
within the right of way.
(2) High-pressure pipelines and saltwater pipelines.
(A) Depth of cover for crossings.
(i) Depth of cover is the depth to the top of the carrier
pipe or casing, as applicable. Where materials and other conditions
justify, such as on existing lines remaining in place, the district
may approve a minimum depth of cover under the pavement structure
of 12 inches or one-half the diameter of the pipe, whichever is greater.
For encased high-pressure pipeline, the minimum depth of cover shall
be:
(I) the greater of 18 inches or one-half the diameter
of the pipe, under pavement structures;
(II) 30 inches if the line is outside the pavement
structure or under a ditch; or
(III) 36 inches for unencased sections of encased lines
outside the pavement structure.
(ii) Where a reinforced concrete slab is used to protect
the pipeline, the district may authorize a reduction in the depths
specified in this section. For unencased high-pressure pipelines,
the minimum depth of cover is as follows:
(I) 60 inches under the pavement surface or 18 inches
under the pavement structure in paved areas; or
(II) 48 inches if the line is placed outside the pavement
structure or under a ditch.
(B) Depth of cover for longitudinal placement. The
minimum depth of cover shall be 48 inches.
(C) Encasement. Casing shall consist of a vented steel
pipe.
(D) Unencasement.
(i) Where encasement is not employed, the utility shall
show that the welded steel carrier pipe will provide sufficient strength
to withstand the internal design pressure and the dead and live loads
of the pavement structure and traffic. Additional protective measures
must include:
(I) heavier wall thickness, higher factor of safety
in design, or both;
(II) adequate coating and wrapping;
(III) cathodic protection; and
(IV) the use of Barlow's formula regarding maximum
allowable operating pressure and wall thickness, as specified in 49
CFR §192.105.
(ii) Shallow anode bed types exceeding 48 inches in
width shall not be permitted in the right of way. All others must
have a depth of coverage of at least 36 inches. Deep well anode beds
of up to 60 inches in diameter are acceptable. Rectifier and meter
loop poles shall be placed at or near the right of way line.
(iii) The minimum length of the additional protection
shall be the same as that required for an encased crossing.
(iv) The district may allow existing lines under low-volume
highways to remain in place without encasement or extension of encasement
if they are protected by a reinforced concrete slab or equivalent
protection or if they are located at a depth of five feet under the
pavement structure and not less than four feet under a highway ditch.
(E) Vents. Vents shall be installed at both ends of
a casing, regardless of length, with a marker on at least one end.
Vents shall be placed at the right of way line immediately above the
pipeline, situated so as not to interfere with highway maintenance
or be concealed by vegetation. The owner's name, address, and emergency
telephone number shall be shown on each vent marker.
(F) Aboveground appurtenances. Aboveground appurtenances,
except vents for gas lines, shall not be permitted within the right
of way.
(c) Water lines.
(1) Material type. All material types used for water
lines shall conform to American Waterworks Association, applicable
local requirements, and 30 TAC §290.44(a)(relating to Water Distribution).
(2) Depth of cover. The minimum depth of cover shall
be 30 inches, but not less than 18 inches below the pavement structure
for crossings.
(3) Encasement. Unless another type of encasement is
approved by the district, water lines crossing under paved highways
must be placed in a steel encasement pipe within the limits of the
right of way. At the district's discretion, encasement may be omitted
under center medians and outer separations that are more than 76 feet
wide. At the district's discretion, encasement under side road entrances
may be omitted in consideration of traffic volume, condition of highway,
maintenance responsibility, or district practice. Existing water lines
24 inches or greater may be allowed to remain unencased under the
pavement of new low volume highways, provided depth and all other
requirements of 30 TAC §290.44 are met.
(4) Manholes. The width dimensions shall be no larger
than is necessary to hold equipment involved and to meet safety standards
for maintenance personnel. The maximum inside diameter of the manhole
chimney shall not exceed 48 inches. The outside diameter of the manhole
chimney at the ground level shall not exceed 36 inches.
(5) Aboveground appurtenances.
(A) Fire hydrants and valves. When feasible, fire hydrants
and blow-off valves are to be located at the right of way line. Fire
hydrants shall not be placed in the sidewalk or any closer than five
feet from the back of the curb. Valve locations shall be placed so
as not to interfere with maintenance of the highway.
(B) Water meters. Individual service meters shall be
placed outside the limits of the right of way. Master meters for a
point of service connection may be placed in a manhole with a maximum
width of 48 inch inside diameter. If additional volume is required,
a manhole with a neck of 60-inch depth must be used.
(C) Service lines crossing highway by bore. Lines for
customer service that cross the highway may be placed in a high-density
polyethylene (HDPE) encasement pipe without joints (rolled pipe).
(d) Nonpotable water control facilities.
(1) Applicability. This subsection applies to agricultural
irrigation facilities, water control improvement districts, municipal
utility districts, flood control districts, canals, and similar nonpotable
water control facilities.
(2) Depth of cover for buried pipe facilities. The
minimum depth of cover, regardless of type of pipe used, shall be
30 inches, but not less than 18 inches below any pavement structure.
(3) Encasement for buried pipe facilities. Unless the
district approves another type of encasement, all non-potable water
control lines crossing under paved highways within the right of way
must be placed in a steel encasement pipe. At the district's discretion,
encasement may be omitted under center medians and outer separations
that are more than 76 feet wide.
(4) Location and design requirements. Open ditch facilities
and buried pipe facilities designed and constructed in accordance
with this subchapter may be installed across the right of way. Longitudinal
buried pipe facilities installed within the right of way must conform
with §21.41(c) of this subchapter (relating to Overhead Electric
and Communication Lines), consistent with the clearances applicable
to all roadside obstacles. Open ditch facilities shall not be installed
longitudinally within the right of way, nor will any aboveground appurtenances
be permitted within the horizontal clearance.
(5) Levee/ditch travel road location. Coordination
with and approval by the district is required where levee/ditch travel
roads intersect the highway.
(e) Sanitary sewer lines.
(1) Material type. All material types used for sanitary
sewer lines shall conform to applicable provisions of 30 TAC Chapter
217 and applicable local requirements.
(2) Depth of cover. The minimum depth of cover shall
be 30 inches, but not less than 18 inches below any pavement structure.
(3) Encasement. Pressurized line crossings under paved
highways within the limits of the right of way shall be placed in
a steel encasement pipe. Gravity flow lines not conforming to the
minimum depth of cover shall be encased in steel or concrete. At the
district's discretion, encasement may be omitted under center medians
and outer separations that are more than 76 feet wide.
(4) Manholes. Manholes serving sewer lines up to 12
inches shall have a maximum inside diameter of 48 inches. For lines
larger than 12 inches, the manhole inside diameter may be increased
an equal amount, up to a maximum diameter of 60 inches. Manholes for
large interceptor sewers shall be designed to keep the overall dimensions
to a minimum. The outside diameter of the manhole chimney at the ground
level shall not exceed 36 inches.
Cont'd... |