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HomeMy WebLinkAboutRES 3140 CITY OF RENTON, WASHINGTON RESOLUTION NO. 3140 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF RENTON, WASHINGTON, ADOPTING TRENCH RESTORATION AND STREET OVERLAY REQUIREMENTS. WHEREAS, the City of Renton maintains a system of City ,-streets; and WHEREAS, the right-of-way for the City streets also includes public and private utilities; and WHEREAS, the City streets are disturbed from time to time by the City, private utilities, general contractors and others; and WHEREAS, maintenance of a good system of City streets requires . good quality restoration of the street after trenching; and WHEREAS, it is advisable to have standards for trench restoration and street overlays within the City of Renton; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF RENTON, WASHINGTON, DO RESOLVE AS FOLLOWS : SECTION I. The above recitals are found to be true and correct in all respects . SECTION II. The City Council hereby adopts street restoration and street overlay requirements dated April 21, 1995, a copy of which is attached hereto and incorporated by reference as if fully set forth. i PASSED BY THE CITY COUNCIL this 17th day of July , 1995 . 1 Marily Petersen, City Clerk 1 RESOLUTION NO. 3140 APPROVED BY THE MAYOR this 17th day of July , 1995 . (—," % � Earl ymer, Mayor Approved s to form: La enc J. War n, City Attorney RES.452 : 6/02/95 2 TRENCH RESTORATION AND STREET OVERLAY REQUIREMENTS CITY OF RENTON TRENCH RESTORATION AND STREET OVERLAY REQUIREMENTS DATE: APRIL 21, 1995 1.0 PURPOSE The purpose of this policy is to establish guidelines for the restoration of City streets disturbed by installation of utilities, and other construction activities. Any public or private utilities, general contractors, or others permitted to work in the public right-of-way will adhere to the procedures set forth in this policy. 2.0 DEFINITIONS Engineer: The term engineer shall denote the City project manager and/or plan reviewer, or their designated representative. 3.0 APPLICATION 3.1 The following guidelines shall be followed when doing trench or excavation work within the paved portion of any City of Renton right-of-way. 3.2 Modifications or exemptions to these policies may be authorized by the Planning/Building/Public Works Administrator, or authorized representative, upon formal request by the permit applicant and demonstration of an equivalent alternative. 4.0 REOUIREMENT FOR OVERLAY, OVERLAY WIDTHS 4.1 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. A. Longitudinal trenches or crossings, perpendicular to the roadway edge, shall be repaired either by sawcut and removal, or by grinding the top two (2") inches and paving two (2") inches with class "B" asphalt, per Standard Detail HR-23 (attached). At the discretion of the engineer, an overlay may be required over wide longitudinal trenches or crossings. B. If the trenching is down the middle of a single lane, then a lane-width overlay will be required per Standard Detail SP Page: PAGE# H032 (attached). C. If the trenching is down the middle of two lanes, or is within three-feet (T) of any lane line, the lanes affected will be overlaid. D. If the trenching is greater than, or equal to, 40% of lane per block, then the lanes affected will be overlaid. City of Renton 2 Trench Restoration and Street Overlay Requirements E. The minimum length of overlay shall be six and one-half(6.5)feet. F. Pavement restoration associated with 'pot holing' shall be a minimum of two (2) feet around the excavation. 5.0 INSPECTION 5.1 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 permit conditions such as the following: A. Trenches need to be relocated in the field because of conflicts with existing utilities. B. There has been additional damage to the existing asphalt surface due to the contractor's equipment. C. The trench width was increased significantly or the existing pavement is undermined. D'. There were significant problems that were discovered during construction. 6.0 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 the Traffic Operations Engineer. 7.0 CITY OF RENTON STANDARDS 7.1 All materials and workmanship shall be in accordance with the City of Renton Standard and Supplemental Specifications except where otherwise noted in these Standards. Materials and workmanship are required to be in conformance with standards for the Standard Specifications for Road, Bridge, and 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 current edition, as modified by the City of Renton Supplemental Specifications. 7.2 Trench backfill and resurfacing shall be as shown in the City of Renton Standard Details, unless modified by the Right-of-Way Use Permit. Surfacing depths shown in the Standard Details are minimums and may be increased by the Engineer to meet traffic loadings or site conditions. h:\diviaion\admin\cak\trenchrq Rev.421/95 City of Renton 3 Trench Restoration and Street Overlay Requirements 8.0 TRENCH BACKFILL AND RESTORATION CONSTRUCTION REQUIREMENTS 8.1 Trench restoration shall be either by a patch or overlay method, as required and indicated on Standard Details#HR-05,HR-23, and HR-22 (SP PAGE: #H032,H- 32A, H033). 8.2 All trench and pavement cuts which will not be overlaid shall be made by sawcuts. Sawcuts shall be a minimum of one foot (P) outside the trench width. 8.3 All trenching shall be backfilled with crushed surfacing materials conforming to Section 4-04 of the Standard Specifications within the top four feet (4'). Any trenching over four feet (4') in depth shall comply with the same requirement except that the contractor may use materials approved by the Engineer or Materials Lab for backfilling below the four foot(4') depth. 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") shall 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 shall 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. 8.4 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. 8.5 Asphalt Concrete Class E or Class B shall be placed to the compacted depth as shown on the attached details 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. 8.6 Tack coat shall be applied to the existing pavement at edge of sawcuts and shall be emulsified asphalt grade CSS-1, as specified in Section 9-02.1(6) of the Standard Specifications. Tack shall be applied as specified in Section 5-04 of the Standard Specifications. 8.7 Asphalt Concrete Class B shall be placed in accordance with Section 5-04 of the Standard Specifications•, except those longitudinal joints between successive layers h:\division\admin\cak\trenchrq Rev.421/95 City of Renton 4 Trench Restoration and Street Overlay Requirements of asphalt concrete shall be displaced laterally a minimum of twelve (12) inches, 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 curb depth below four inches (4") for stormwater flow. The Engineer may require additional grinding to increase the curb depth available for stormwater 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 performed shall be as required by the attached details. 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 with 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. 8.8 All joints shall be sealed using paving asphalt AR-4000W. 8.9 When trenching within the roadway shoulder(s), the shoulder shall be restored to its original condition, or better. 8.10 The final patch shall be completed as soon as possible and shall not exceed fourteen (14) 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 final patch or overlay work is subject to the Engineer's approval. The Engineer may deem it necessary to complete the work within the fourteen(14) day time frame and not allow any time extension. Should this occur, the Contractor shall perform the necessary work, as directed by the Engineer. h:\division\admin\csk\t=chrq Rev.421/95 City of Renton 5 Trench Restoration and Street Overlay Requirements 8.11 A City of Renton temporary Traffic Control Plan (from Renton Transportation Engineering) shall be submitted and approved by the Engineer a minimum of three (3)working days prior to commencement of work. Approved by: � Gregg Zi e , P.E., Administrator Building/Planning/Public Works Department Date: h:\divieion\admin\csk\trenchrq Rev.421/95 T Q ƒ \ _ . 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