HomeMy WebLinkAboutORD 5131Amends ORD:4861,5009
CITY OF RENTON,WASHINGTON
ORDINANCE NO.5131
AN ORDINANCE OF THE CITY OF RENTON,WASIDNGTON,
AMENDING SECTION 9...H)-H OF CHAPTER 16,STREET
EXCAVATIONS,OF TITLE IX,PUBLIC WAYS AND PROPERTY,OF
ORDINANCE NO.4260 ENTITLED "CODE OF GENERAL
ORDINANCES OF THE CITY OF RENTON,WASHINGTON''1 BY
REVISING TRENCH RESTORATiON AND STREET OVERLAY
REQUIREMENTS.
THE CITY COUNCIL OF THE CITY OF RENTON,WASHINGTON,DOES ORDAIN
AS FOLLOWS:
SECTION·!.Section 9-10-11 of Chapter 10,Street Excavations,of Title IX,
Public Ways and Property,of Ordinance No.4260 entitled "Code of General Ordinances of the
City of Renton,Washington"is hereby amended to read as follows:
TRENCH RESTORATION AND STREET OVERLAY REQUIREMENTS
A.Purpose:The purpose of this code section is to establish guidelines for the restoration of
City streets disturbed by installation of utilities,and oilier construction activities.Any public or
private utilities,general contractors,or others permitted to work in the public right-of-way wm
adhere to the procedures set forth in this policy.
B.Definition:
Engineer:The term engineer shaH denote ilie City project manager,inspector andlor plan
reviewer,or their designated representative.
C.Application:The following standards in this Section shall be followed when doing
trench or excavation work within ilie paved.portion of any City of Renton right-of-way.
Modifications or exemptions to these standards may be authorized by the
Planning/Building/Public Works Administrator,or authorized representative,.upon written
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ORDINANCE NO.5131
request by the permittee,the permittee's contractor or engmeer,and demonstration of an
equivalent alternative.
D.Hours of Operations:Hours for work within the roadway for asphalt overlays or trench
restoration shall be as directed by the Traffic Control Plan requirements and as approved by the
Traffic Operations Engineer.
E.Inspection:The Engineer may determine in the field that a full street-width (edge-of-
pavement to edge-of-pavement)overlay is required due to changes in the pelmit conditions such
as,but not limited to the following:
1.There has been damage to the existing asphalt surface due to the contractor's
equipment.
2.The trench width was increased significantly or the existing pavement is
undermined,or damaged.
3.Any other construction related activities that require additional pavement
restoration.
F.City of Renton Standards:All materials and workmanship shaH be in accordance with
the City of Renton Standard and Supplemental Specifications (current adopted version)except
where otherwise noted in these Standards.Materials and workmanship are required to be in
comormance with standards for the Standard SpecifICations for Road,Bridge,ami Municipal
Construction prepared by the Washington State Chapter of the American Public Works
Association (APWA)and the Washington State Department of Transportation (WSDOT)and
shall comply with the most current edition,as modified by the City of Renton Supplemental
Specifications .
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ORDINANCE NO.5131
1.An asphalt paver shall be used in accordance with Section 5-04.3(3)of Standard
Specifications.A "Layton Box"or equal may be used in place of the power-propelled paver.
Rollers shall be used in accordance with Section 5-04.3(4)of the Standard Specifications."Plate
Compactors"and "Jumping Jacks"SHALL NOT be used in lieu ofroUers.
2.Trench backfill and resurfacing shall be as shown in the City of Renton Standard
Details,unless modified by the City Permit.Surfacing depths shown in the Standard Details are
minimums and may be increased by the Engineer to meet traffic loads or site conditions.
3.Requirement For Patching,Overlay,and Overlay Widths:All trench and
pavement cuts shall be made by sawcut or by grinding.Sawcuts or grinding shall be a minimum
of one foot (1')outside the trench width.The top two inches (2")of asphalt shall be ground
down to a minimum distance of one foot (l ')beyond the actual outside edges of the trench and
shan be replaced with two inches (2")of Class B asphalt,per City of Renton Standard Plan #HR-
23 (SP Page H032A).At the discretion of the engineer,a full street width overlay may be
required.
Lane-width or a full street-width overlay will be determined based upon the location and
length of the proposed trench within the roadway cross-section.Changes in field conditions may
warrant implementation of additional overlay requirements.
a.Trenches (Road Crossings):
(1)The minimum width of a transverse patch (road crossing)shall be
six and one-half feet (6.5').See City of Renton Standard Plan Drawing #HR-23 (SP Page:
H032A).
(2)Any affected lane will be ground down two inches (2")and paved
for the entire width of the lane.
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ORDINANCE NO.5131
(3)The patch shaH be a IDllllmum of one foot (1')beyond the
excavation and patch length shall be a minimum of an entire traveled lane.
(4)If the outside of the trenching is within three feet (3')of any
adjacent lane line,the entire adjacent traveled lane affected will be repaved.
(5)An area including the trench and one foot (1')on each side of the
trench but not less than six and one half feet (6.5')total for the entire width of the a-ffected
traveled lanes will be ground down to a depth of two inches (2").A two-inch (2")overlay of
Class B asphalt will be applied per City standards.
b.Trenches Running Parallel with the Street:
(1)The minimum width of a longitudinal patch shall be four and one-
half feet (4.5').See City of Renton Standard Plan Drawing #HR-05 (SP Page H032).
(2)If the trenching is within a single traveled lane,an entire lane-
width overlay will be required.
(3)If t.~e outside of the trenching is within three feet (3')of any
adjacent lane line,the entire adjacent traveled land affected will be overlaid.
(4)If the trenching is greater than,or equal to 30%of lane per block
(660 foot maximum block length),or if the total patches exceed 12 per block,then the lanes
affected will be overlaid.Minimum overlay shall include aU patches within the block section.
(5)The entire traveled lane width for the length of the trench and an
additional ten feet (10')at each end of the trench will be ground down to a depth of two inches
(2").A two-inch (2")overlay of Class B will be applied per City standards.
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ORDINANCE NO.5]31
c.Potholing -Pot holing shall meet the same requirements as trenching and
pavement restoration.Potholing shall be a minimum of one foot (l ')beyond the excavation.All
affected lanes will be ground down to a depth of two inches (2")and paved not less than six and
one half feet (6.5')wide for the entire width of the lane.Potholes greater than five feet (5')in
length,width or diameter shall be restored to trench restoration standards.In all cases potholes
shall be repaired per Renton Standard Plan #HR05 (SP Page H032).Restoration requirements
utilizing vactor equipment will be determined by the engineer.
4.Pavement Removal In Lieu Of Grinding:
The contractor in all cases can remove the pavement in the replacement area instead of
grinding out the specified two inches (2")of asphalt.Full pavement replacement to meet Of
exceed the existing pavement depth will be required for the area of pavement removal.
5.Trench Backfill and Restoration Construction Requirements:
a.Trench restoration shall be either by a patch or overlay method,as
required and indicated on City of Renton Sta...11.dard Plans #HR-05,HR-23,and HR-22 (SF Pages
#H032,H032A,and H033).
b.All trench and pavement cuts,which will not be overlaid,shall be made by
sawcut or grinding.Sawcuts shall be a minimum of two feet (2')outside the excavated trench
width.
c.All trenching within the top four feet (4')shall be backfilled with crushed
surfacing materials conforming to Section 4-04 of the Standard Specifications.Any trenching
over four feet (4')iIl depth may use materials approved by the Engi.l1eer or Materials Lab for
backfilling below the four-foot (4')depth.
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ORDINANCE NO.51 31
If the existing material (or other material)is determined by the Engineer to be suitable for
backfill,the contractor may use the native material except that the top six inches (6")shaH be
crushed surfacing top course material.
The trench shall be compacted to a minimum ninety-five percent (95%)density,as
described in Section 2-03 of the Standard Specifications.In the top six feet (6')of any trench,
backfill compaction shall be performed in 8 to 12-inch lifts.Any trench deeper than six feet (6')
may be compacted in 24 inch lifts,up to the top six-foot (6')zone.
All compaction shall be performed by mechanical methods.The compaction tests may be
performed in four-foot (4')vertical increments maximum.The test results shall be given to the
Engineer for review and approval prior to paving.The number and location of tests required
shall be determined by the Engineer.
d.Temporary restoration of trenches for overnight use shall be accomplished
by using MC mix (cold mix),Asphalt Treated Base (ATB),or steel plates,as approved by the
Engineer.ATB used for temporary restoration may be dumped directly into the trench,bladed
out and rolled.After rolling,the trench must be filled flush with asphalt to provide a smooth
riding surface.If the temporary trench restoration does not hold up,the Contractor shaH repair
the patch within eight hours of being notified of the problem by the City.This requirement
applies 24 hours per day,seven days per week.In the event that the City determines to repair the
temporary patch,the Contractor shall reimburse the City in an amount that is double the City's
costs in repairing the patch,with the second half ofthe reimbursement to represent City overhead
and hidden costs.
e.Asphalt Concrete Class E or Class B shall be placed to the compacted
depth as required and indicated on City of Renton Standard Plans #HR-05,HR-23,and HR-22
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ORDINANCE NO.5131
(SP Pages #H032,H032A,and H033)or as directed by the Engineer.The grade of asphalt shall
be AR-4000W.The materials shall be made in conformance with Section 9-02.1(4)of the
Standard Specifications.
f.Tack coat shall be applied to the existing pavement at edge of saw cuts
and shall be emulsified asphalt grade CSS-l,as specified in Section 9-02.1(6)ofllie Standard
Specifications.Tack shall be applied as specified in Section 5-04 of the Standard Specifications.
g.Asphalt Concrete Class E or Class B shall be placed in accordance with
Section 5-04 of the Standard Specifications;except those longitudinal joints between successive
layers of asphalt concrete shall be displaced laterally a mini..mum of twelve inches (12"),unless
otherwise approved by the Engineer.Fine and coarse aggregate shall be in accordance with
Section 9-03.8 of the Standard Specifications.
All street surfaces,walks or driveways within the street trenching areas shall be feathered
and shimmed to an extent that provides a smooth-riding connection and expeditious drainage
flow for the newly paved surface.
Feathering and shimming shall not decrease the minimum vertical curb depth below four
inches (4")for storm water flow.The Engineer may require additional grinding to increase the
curb depth available for storm water flow in areas that are inadequate.Shimming and feathering
as required by the Engineer shall be accomplished by raking out the oversized aggregates from
the Class B mix as appropriate.
Surface smoothness shall be per Section 5-04.3(13)of the Standard Specifications.The
paving shall be corrected by removal and repaving of the trench only.Asphalt patch depths will
vary based upon the streets being trenched.The actual depths of asphalt and the work to be
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ORDINANCE NO.5131
performed shall be as required and indicated on City of Renton Standard Plans #HR-05,HR-23,
and HR-22 (SP Pages #H032,H032A,and H(33).
Compaction of all lifts of asphalt shall be a minimum ninety-two percent (92%)of
density as determined by WSDOT test Method 705.The number of tests required shall be
determined by the Engineer.
Testing shall be performed by an independent testing lab wiLlI the results being supplied
to the Engineer.Testing is not intended to relieve the contractor from any liability for the trench
restoration.It is intended to show the inspector,and the City,that the restoration meets these
specifications.
h.All joints shall be sealed using paving asphalt AR-4000W.
1.When trenching within the unpaved roadway shoulder(s),the shoulder
shaH be restored to its original condition,or better.
j.The final patch shall be completed as soon as possible and shall not
ex.ceed fifteen (i 5)working days after first opening the trench.This time frame may be adjusted
if delays are due to inclement paving weather or other adverse conditions that may exist.
However,delaying of fmai patch or overlay work is subject to the Engineer's approval.rne
Engineer may deem it necessary to complete the work within the fifteen (15)working day time
frame and not allow any time extension.Should this occur,the Contractor shaH perform the
necessary work,as directed by the Engineer.
k.A City of Renton Temporary Traffic Control Plan (from Renton
Transportation Engineering)shan be submitted and approved by the Engineer a minimum of
three (3)working days prior to commencement of work.
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ORDINANCE NO.5131
6.Removal of Utility Locate Markings from Sidewalks Required:The Permittee
will be required to remove utility locate marks on sidewalks only within the Downtown Core
Area.The permittee shaH remove the utility locate marks within 14 days ofjob completion.
SECTIONIl.
30 days after publication.
This ordinance shall be effective upon its passage,approval,and
PASSED BY THE CITY COUNCIL this 4th day of A_p_r_l_"l__~,2005.
Bonnie 1.Walton,City Clerk
APPROVED BY THE MAYOR this 4th day Of __=A",,-p=-r=-il=--~,2005.
Approved as to fonn:
/'1~'/
d..C:v'"l;r~"-l.P
Lawrence J,Warren,",!tty Attorney
Date of Publication:4/8/2005 (summary)
ORD.l130:2/14/05:ma
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