8514 SHADOW WOOD DR Lot 3 2024-03-29

iii. After backfill and placing a tack coat on the existing asphalt edges, the final patch shall be constructed with 6-inches of compacted HMA placed in the window cut up to finished grade per WSDOT Standard Specifications Section 5-04. 3. Any trench in a roadway that is to be resurfaced by the County Overlay Program within 12 months shall be backfilled to the bottom edge of the existing asphalt or within 4-inches of existing road grade, whichever is greater, with bank run gravel or CSTC, compacted to 95% of maximum density, or with Controlled Density Fill (CDF) when required by the Engineer in accordance with Section 8- 07 of this chapter, to minimize settlement. The backfill shall be covered by temporary asphalt as specified in Section 8-05.C.(1),ii or 8-05.C.(2).11 above. 4. Water settling of backfill in trenches under existing roadways is not permitted. 5. Temporary restoration of trenches for overnight use shall be accomplished by using asphalt or steel plates. Asphalt used for temporary restoration may be dumped directly into the trench, bladed out, and rolled. After rolling, the trench shall be filled flush with asphalt to provide a smooth riding surface. Asphalt materials used for temporary patching must be removed prior to placement of the permanent patch. 6. Final patches shall conform to the requirements of this chapter and shall be completed as soon as possible but no later than 30 days after first opening the trench, multiple window cuts, or a single window cut. Any delay in placement of the final patch shall be approved by the Engineer. 7. Work located outside the paved portion of the roadway (i.e. in the sidewalk, walkway, planter strip, or gravel shoulder) regardless of how close to a window cut (single or multiple) or trench in the paved portion of the roadway (i.e. curb to curb, shoulder to shoulder, or curb to shoulder) is subject to the restoration requirements of sub -sections 8), 9), or 10) below as applicable. 8. Concrete pavement shall be restored in accordance with WSDOT/APWA Standard Specifications Section 5-05. If concrete panels in an existing road are cut by a trench, the Engineer may require removal of the panels to ensure road stability. 9. Gravel shoulders disturbed by excavation shall be replaced full width with 6 inches of crushed surfacing top course (CSTC) meeting the specifications of the WSDOT/APWA Standard S ecifications Section 9-03.9(3). 10. Any cut or damage to permeable pavement shall be restored with the same permeable pavement, to an equivalent or better condition as determined by the Engineer. Paving over permeable pavement with conventional asphalt, concrete or other impermeable material invalidates prior stormwater design assumptions, creates the potential for runoff to exceed a conveyance or infiltration system, and shall not be allowed unless approved by the Engineer. Permeable pavement shall be restored in accordance with manufacturer's specifications by contractors qualified either by previous experience (at least three permeable pavement projects within the past five years) or certification by an appropriate trade organization, such as the National Ready -Mix Concrete Association. The pavement restoration plan shall be approved by the Engineer. 8-12 Engineering Design and Development Standards September 17, 2021