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§ 123 BARCLAYS CALIFORNIA CODE OF REGULATIONS Title 23
<br /> (13)For that portion of the trench above the design freeboard,vertical (e)Pipelines,conduits,and utility lines may be installed by the open
<br /> side slopes may be allowed, cut--method through a levee below the design flood plane,or within the
<br /> (10)The bottom width of trenches excavated for the installation of a levee foundation under the following conditions:
<br /> pipeline,conduit,or utility line must be two(2)feet wider than the diame- (1)One or more of the following conditions must apply:
<br /> ter of the pipeline or conduit,or two(2)times the pipe diameter,whichev- (A)The pipeline,conduit,or utility line wil I be maintained by a public
<br /> er is greater. agency with a history of good maintenance based upon annual mainte-
<br /> (1 1)The minimum :over for pipelines,conduits,and utility lines in- nance or inspection reports.
<br /> stalled through the lev,e crown is twenty four(24)inches.If it becomes (13)The levee is designed to withstand a depth of less than six(6)feet
<br /> necessary to raise a lev ec crown to provide minimum cover,the ingitu- of water measured with respect to the elevation of the landside levee toe.
<br /> dinal slope of the crown must be a minimum of ten(10)feet horizontal (C)The levee is designed to withstand a depth of less than twelve(12)
<br /> to one(1)foot vertica:. Where twenty-four(24)inches of cover is not feet of water measured with respect to the elevation of the landside levee
<br /> practical,a concrete or other engineered cover is required. toe and provides flood protection for a rural area,or an area where the
<br /> (12)The minimum:,over for pipelines,conduits,and utility lines in- board anticipates little Future urban development.
<br /> stalled within the levee slope is twelve(12)inches.Where the installation (2)Pipelines open to the waterway must be a minimum of thirty(30)
<br /> will not interfere with".evee maintenance or flood fight activities,it may inches in diameter,and must have a readily accessible positive closure
<br /> not be necessary to bu.y the line within the levee slopes. device installed on the waterward side.
<br /> (13) When practice,., pipelines, conduits, and utility lines installed (3) Seepage along pipelines, conduits,and utility lines must be pre-
<br /> within a levee section must be separated from parallel pipelines, con- vented by eitherof the following methods:
<br /> duits,and utility lines by a minimum of twelve(12)inches,or the diame- (A)The pipeline,conduit,or utility line is encased in reinforced con-
<br /> ter of the largest pipeline,conduit,or utility line,whichever is larger,to trete cast against firm undisturbed earth.
<br /> a maximum of thirty-six(36)inches.
<br /> (14)When practical. (B)The conduit has reinforced concrete battered walls at an inclina-
<br /> p pipelines,conduits,and utility lines must have a tion of one(I)foot horizontal to four(4)feet vertical or flatter.
<br /> minimum vertical spat ing of six (6) inches when crossing other pipe- (4)The work must commence and be completed prior to the flood sea-
<br /> lines,conduits,or utili?y lines.
<br /> son.
<br /> (15)A siphon breaker with a protective housing may be required and (5) Levees located within the Sacramento- San Joaquin Delta low-
<br /> must be installed off th-,levee crown roadway where it will not interfere lands may only be cut below the design flood plane after appropriate en-
<br /> with levee maintenance.
<br /> gineering studies are performed and approved.
<br /> (16)Electrical and communication line installed through a levee or (t)Pipelines,conduits,and utility lines may be installed under a levee
<br /> within ten(10)feet ofa levee toe must be encased in schedule 40 PVC or stream channel by tunneling,jacking,orboring,if-the following condi-
<br /> conduit or equivalent.Low voltage lines(24 volts or less)and fiber optic tions are met:
<br /> cable may be allowed Without conduit if properly labeled.
<br /> (17)A standard rein forced concrete U wall for levee erosion protec- the levee. pipeline,conduit,or utility line is at least thirty(30)feet under
<br /> tion is required at the o.tlet end ofa pipeline or conduit discharging with- (2)The pipeline,conduit,or utility line is verified to have the required
<br /> in ten(10)feet of a le'-c toe. See Figures 8.05 and 8.06 for U-Wallde- cover.A greater depth of cover may be required based upon the feasibil-
<br /> sign criteria. ity of achieving the required cover or on local soil stability and channel
<br /> (18)Existing levee erosion protection must be restored by the permit- hydraulics.
<br /> tee if it is damaged due,ig the installation of a pipeline,conduit,or utility (3)If the installation is to be more than fifty(50)feet below the levee
<br /> line. and the entire tloodway and streambed,the board may waive the require-
<br /> (19)The permittee must replant or reseed levee slopes to restore sod, ment for a permit provided a letter of intent is filed with the board prior
<br /> grasses or other nonwc)dy ground covers that are destroyed or damaged to commencement of the project.
<br /> during the installation ofa pipeline,conduit,or utility line. (4)The portal and outlet of a tunnel,jacking,or boring must be a mini-
<br /> (20)Within the lees or within ten(10)feel of levee toes,any excava- mum distance of ten(10) feet beyond the projected levee slope without
<br /> tion for the installation nfa pipeline,conduit,or utility line must be back- an approved stability and seepage analysis.
<br /> filled in four(4)to six (6)inch lavers with approved material and coin- (5)Installation may occur during the flood season and when the water
<br /> patted to a relative compaction of not less than ninety(90)percent,per surface elevation in the floodway is expected to be above the elevation
<br /> ASTM D1557 91,dal--d 1991,which is incorporated by reference and of the landside levee toe ifadequate containment cells are constructed at
<br /> above optimum moisr..tre content or ninety-seven (97) percent, per the portal and outlet.
<br /> ASTM D698 91,dated 1991,which is incorporated by reference and at (6)The installation of a pipeline,conduit,or utility line under levees
<br /> or above optimum moisture content.Compaction tests by a certified soils in the Sacramento San Joaquin Delta lowlands requires adequate con-
<br /> laboratory will be regUred to verify compaction of backfill within a le- tainment cells at the portal and outlet when the installation is less than
<br /> vec.
<br /> (2 1)Boring a pipelir,,.or conduit through a levee is permitted if the fol- fifty(50)feet below the streambed and levee toes.
<br /> lowing additional concl itions are met: (7)Pipelines carrying gas or fluids under pressure below a levee must
<br /> have provision for rapid closure.
<br /> (A)The invert of the pipeline or conduit must be located at least three (8) Pipelines and conduits open to the waterway and below a levee
<br /> (3) feet above the design flood plane. must have a positive closure device which is accessible at all times unless
<br /> (B)The pipeline or conduit must be butt welded.Polyethylene pipes it is demonstrated to be unnecessary.A flap gate is not a positive closure
<br /> may be used as provided in subdivisions (t)(4)(A), (f)(4)(B), and device.
<br /> (f)(4)(C)of this section.
<br /> ipe rials are allowewithin a secon
<br /> (C)The pipeline or conduit must be installed by the bentonite boring when designed or resist ng alanticipat ed loading conditions levee and properly
<br /> method or equivalent. The bentonite boring method uses an auger fol- installed:
<br /> lowed by a pipe with n-ultiple port openings through which a bentonite (1)Galvanized iron pipe is allowed if all joints are threaded. Galva-
<br /> slurry is pumped to ensure sealing ofany voids resulting from the boring nized iron pipe joints must be corrosion protected with PVC tape or poly-
<br /> process. ethylene tape wrapped to a thickness of thirty(30)mils or equivalent.
<br /> "e 4.24 Pwgistcr 2009,No.49;12-4-2W9
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