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Home My WebLink AboutWWP2703713.2CITY OF RENTON TRENCH RESTORATION AND STREET OVERLAY REQUIREMENTS Amended April 4, 2005 by Ordinance 5131 SECTION 1 PURPOSE The purpose of this code section 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. SECTION 2 DEFINITIONS Engineer: The term engineer shall denote the City project manager, inspector and,or plan reviewer, or their designated representative. SECTION 3 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. SECTION 4 APPLICATION 1. The following standards shall be followed when doing trench or excavation work within the paved portion of any City of Renton right-of-way. 2. Modifications or exemptions to these standards may be authorized by the Planning/Building/Public Works Administrator, or authorized representative, upon written nteq nest b the ermlttee , the ir contractor or engineer inee r and demonstration of an equivalent alternative. SECTION 5 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 permit conditions such as, but not limited to the following: 1. There has been damage to the existing asphalt surface due to the contractors 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. SECTION 6 CITY OF RENTON STANDARDS 1. All materials and workmanship shall be in accordance with the City of Renton Standard and Supplemental Specifications current adopted version) except where otherwise. - noted in these Standards. Materials and p ( 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 most current edition, as modified by the City of Renton Supplemental Specifications, 1 LANE LINE MARKING 7'-B" STANDARD VEHICLE WHEEL PATH I rMiN 4.5' 3' MIN. MIN. 1' 1' ACP CLASS* MIN. MIN. 6" CRUSHED SURFACING /72"CLASS 'B' TOP COURSE 2SAWCUT AND REMOVE EDGE OF PAVEMENT, OR GRIND, SEAL WITH EDGE OF CURB & GUTTER, AR400OW OR CENTER OF LANE LINE 5' MIN. CRUSHED ROCK; FLOWABLE FILL OR AS REQUIRED BY ENGINEER *MINIMUM ACP CLASS 'E' or 'S' SHALL BE: PRINCIPAL/MINOR/COLLECTOR ARTERIAL STREETS & INDUSTRIAL ACCESS STREETS -• 6" ACP CLASS 'E' ore 'B' RESIDENTIAL ACCESS STREETS - 2" ACP CLASS 'E' or '8'. NOTE UPON REQUEST OF ENGINEER, NEW ROADWAY. PAVEMENT SECTION MAY BE DESIGNED USING AN APPROVED METHOD FOR TYPICAL LONGITUDINAL PATCH AND OVERLAY DETERMINING PAVEMENT THICKNESS. FOR FLEXIBLE PAVEMENT ti Y o ADOPTED . (� A •'"C3rY OF RENT`ON + + - 5'fANDARi1 PLAINS t,sr DAM oz/zoos 02 2005 LIMPED NOTES pOV DC 07 2004 1 MOOTIED NOTES OeV GZ DATE REVISION _ BY PR DWG. NAME: HR-•OS SP PAGETH632 An asphalt paver shall be used in accordance with Section 5.04.3(3) of Standard Specifications, A "Layton e. The entire traveled lane width for the length of the trench and an additional ten feet (10') at each end of the Box" or equal maybe used in place of the power propelled aver. Rollers shall be used in accordance with trench will be ground dawn to a depth of two inches (2"). A two-inch (2") overlay of Class B will be applied Section 5.04.3(4j of the Standard Specifications. `Plate Compactors" and "Jumping Jacks" SHALL NOT be per City standards. used in lieu of rollers. 2. Trench backfill and resurfacing shall be as shown in the City of Renton Standard Details, unless modified by the 3. Potholing: Potholing shall meet the same requirements as trenching and pavement restoration. Potholing shall City Permit Surfacing depths shown in the Standard Details are minimums and maybe increased by the Engineer be a minimum of one foot (V) beyond the excavation. All affected lanes will be ground down to a depth of two to meet traffic loads or site conditions. inches 2" and paved not less than six and one half feet 6.5 wide for the entire width of the lane. Potholes ( } p ( ) 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 SECTION 7 REQUIREMENT FOR PATCHING OVERLAY OVERLAY WIDTHS utilizing vactor equipment will be determined by the engineer. All trench and pavement cuts shall be made by sawcut or by grinding. Sawcuts or grinding shall be a minimum of one foot SECTION 8 PAVEMENT REMOVAL 1N LIEU OF GRINDING (1') outside the trench width. The top two inches (2") of asphalt shall be ground down to a minimum distance of one foot (V) beyond the actual outside edges of the trench and shall be replaced with two inches (2") of Class B asphalt, per City of Renton Standards. At the discretion of the engineer, a foil street width overlay may be required. 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 or exceed the existing pavement depth will be Lane -width or a full street -width overlay will be determined based upon the location and length of the proposed trench within required for the area of pavement removal. the roadway cross-section. Changes in field conditions may warrant implementation of additional overlay requirements. SECTION 9 TRENCH BACKFILL AND RESTORATION CONSTRUCTION REQUIREMENTS 1. Trenches (Road Crossings). 1 Trench restoration shall be either by a patch or overlay method, as required and indicated on City of Renton a. The minimum width of a transverse patch (road crossing) shall be six and one-half feet (6.5). See City of Standard Plans #HR-05, HR-23, and HR-22 (SP Pages #H032, H032A, and H033). Renton Standard Plan Drawing #HR -23 (SP Page: H032A), 2. All trench and pavement cuts, which will not be overlaid, shall be made by sawcut or grinding. Sawcuts shall be a b, Any affected lane will be ground down two inches (2') and paved for the entire width of the lane. minimum of two feet (2') outside the excavated trench width. c. Patch shall be a minimum of one foot 1' beyond the c d patch length (} y excavation an p gth shall be a minimum of ` 3. 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) in depth may use materials approved by the anentire traveled lane. Engineer or Materials Lab for backfilling below the four -foot (4') depth, if the existing material (or other material) is d. If the outside the trenching is within three feet (3') of any adjacent lane line, the entire adjacent traveled ri e that the may use the native material, except b the E i r to be suitable for backfi(1 the contractorn t e determinedy ng neey p top six inches (6") shall be crushed surfacing top course material. The trench shall be compacted to a minimum i lane affected will be repaved a ninety-five percent (95Io) density, as described in Section 2-03 of the Standard Specifications. In the top six feet e. An area including the trench and one foot (1') on each side of the trench but not less than six and one half (6') of any trench, backfill compaction shall be performed in eight to 12-inch (8-12") lifts. Any trench deeper than six feet (65) total for the entire width of the affected traveled lanes will be ground down to a depth of two feet (6) may be compacted in 24-inch lifts, up to the top six-foot (6') zone. inches (2"). A two-inch (2') overlay of Class B asphalt will be applied per City standards. All compaction shall be performed by mechanical methods. The compaction tests may be performed in maximum four -foot (4') vertical increments.. The test results shall be given to the Engineer for review and approval prior to 2. Trenches Running Parallel Withthe Street: paving. The number and location of tests required shall be determined by the Engineer. a. The minimum width of a longitudinal patch shall be four and one-half feet 4:5' . See City o g p e ( ) e ty f Renton 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 Standard Plan Drawing #HR-05 (SP Page H032). dumped directly into the trench, bladed out and rolled. After rolling, the trench must be filled flush with asphalt to b. If the trenching is within a single traveled lane, an entire lane -width overlay will be required, provide a smooth riding surface. If the temporary restoration does not hold up the Contractor shall repair the patch within eight hours of being notified of the problem by the City. This requirement applies 24 hours per day, seven c. If the outside of the trenching is within three feet (S) of any adjacent lane line, the entire adjacent traveled days a 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 cost in repairing the patch, with the second half of the reimbursement to lane affected will be overlaid. represent City overhead and hidden costs. d. If the trenching is greater than, or equal to 30% of lane per block (660-foot maximum block length), or if the 5, d indicated on City of Asphalt Concrete Class E or Class B shall be placed to the compacted depth as required an a ty to es total patch exceed 12 per block, then the lanes affected will be overlaid: Minimum overlay shall include all Pages #H032 H032A and H033 or as directed b the Renton Standard Plans #HR-05, HR-2o; and HR 22 (SP g ) Y patches within the block section:. 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. 2 3 ASPHALT CONCRETE OVERLAY 2° MIN. CEMENT REMOVE LOOSENED TRIM CONCRETE ASPHALT VERTICALLY 3/4"DIA. X 12" LONG DOWEL BAR 0 18" ON CENTER 6` EXISTING RIGID BASE` MIN. _ 12 MIN COMPACTED TRENCH BACKFILL AS DIRECTED BY THE ENGINEER SAW CUT SHALL BE VERTICAL AND IN STRAIGHT LINES AS DIRECTED BY THE ENGINEER EXISTING CONCRETE PAVEMENT EPDXY COATED DOWEL BARS 6" MIN, ON ALL FOUR SIDES 12" i'+ COMPACTED CRUSHED SURFACING TOP COURSE. CUT AND PANEL REPLACEMENT DETERMINATION: FULL CEMENT CONCRETE PANEL REPLACEMENT: FOR CEMENT CONCRETE SURFACE STREETS, THE MINIMUM RESTORATION SHALL BE FULL PANEL REPLACEMENT, W ONE OR MORE OF THE FOLLOWING CONDITIONS EXIST: Less thon ten (10) yrs old Ten (10) yrs or Oder Additionoi Requirements Access without Bus Route No No Local Access with Bus Yes Yes Route Intersection (Ali Yes Yes Pius one pones beyond Streets the curb.return 40% Removoi Yes Yes Excellent Condition (based on visuol and/or Yes Yes non-destructive testing) Principal, Minor, Yes, IF twenty-four (24) Yes, If twenty-four (24) Coltector Arteriol and square feet or more of square feet or more of ail streets in C8C and ony pone) needs to be any panel needs to be ail bus route patched po?cned *CDF BACKRI-L MAY BE USED IN LIEU OF RESTORING EXISTING RIGID BASE AT THE DISCRETION OF THE ENGINEER. TYPICAL PATCH FOR RIGID PAVEMENT PAVEMENT PATCHING .AND RESTORATION RETAIL �C o ADOPTED CITY OF RENTON STANDARD PLANS DATE - REVISION BY PPR D DWG. NAME: IAR-22 SP PAGE: HO33 2" CLA<, *2" TO 6" C OR C p 1 ' 1 ' 2.5'---..-{(( 1, 11 MIN �P/iIN MIN [ MIN MIN S 'B' FACE EDGE C -ASS 'E' t _ASS 'B' Fi-5' MIN. 2" DEPTH OF GRIND OR SAWCUT AND REMOVE 6.5' MIN. 1' 1' 2.5' 1' II 1' MIN MIN MIN I MINI MIN 2" CLASS `B' CRUSHED ROCK, FLOWABLE FILL' OR AS REQUIRED BY ENGINEER * FOR MINIMUM STANDARDS, SEE DWG# HR--05, SP PAGE H032 OF CURB OR nf: PA\/PNAr7NiT ENTER LINE OR ANE LINE -ACP CLASS* 6" CRUSHED SURFACING TOP COURSE TYPICAL TRANSVERSE PATCH FOR FLEXIBLE PAVEMENT T p ADOPTED c1TY OF ssNTax STANDARD PLANS LSi DATE: 02/2005 DWG. NAME: HR-23 SP PAGE: HO32A 6, Tack coat shall be applied to the existing pavement at edge of saw cuts 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. - 7. 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 minimum 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. -- -nnF Fin hl a afaa� Shall be feathered and shimmed to an 6, Tack coat shall be applied to the existing pavement at edge of saw cuts 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, 7. 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 minimum 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 -04.3 13 of the Specifications. p act an 5 ( } Standard Specificat s The paving shalt 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 and indicated on City of Renton Standard Plans #HR-05,`HR-23, and HR-22 (SP Pages #H032, H032A, and H033). 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., &. All joints shall be sealed using paving asphalt AR-4000W. 9. When trenching within the unpaved roadway shoulder(s), the shoulder shall be restored to its original condition, or better. 10. The final patch or overlay shall be completed as soon as possible and shall not exceed fifteen (151 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 final patch or overlay work is subject to the Engineer's approval. The 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 shall perform the necessary work, as directed by the Engineer. 11. A City of, Renton temporary Traffic Control Plan (from Renton Transportation Engineering) shall -be sub€nitted and approved by the Engineer a minimum of three (3) working days prior to commencement of work. SECTION 10 REMOVAL OF UTILITY LOCAL =ROM SIDEWALKS REQUIRED The Permittee will be required to remove utility locate marks on sidewalks only within the Downtown Core Area. The permittee shall remove the utility locate marks within 14 days of job completion. H:kTrench Restoration',TRS 2005.doc RECOMMENDED FOR APPROVAL BY DATE BY DATE BY DATE BY DATE BY DATE S=37 302 EXPIRES: 4/24 w 00 d � � a� d C) LO E o u) 000 cU Y a 0 W p � U C O > m it T3 a CO 00 CO c < Uj 0 O C 0 (D o C Z 0 F-- 0. Qw N W 0 W 0: In N rah .Z Z W � 4 o W cr 4 __L oft