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D. New Roads <br /> Backfill compaction for new road construction should be accomplished by mechanical <br /> compaction per WSDOT/APWA Specifications. Compaction up to the top 2 feet of a <br /> trench by water settling may be done provided the entire water-settled portion of the <br /> trench reaches 95% maximum density and the top 2 feet of the trench consists of <br /> Controlled Density Fill as specified in Section 8-07 of this chapter. <br /> E. Testing <br /> Consistent with the above requirements and prior to placing any surface materials on <br /> the roadway, it shall be the responsibility of the utility/developer/contractor to provide <br /> density test reports certified by a professional engineer licensed in the State of <br /> Washington. <br /> A minimum of 1 density test shall be taken within every 200 feet of trench length and at <br /> depths of 50 percent of trench depth and at the surface, or as specified by the Engineer. <br /> Compaction of laterals or service line trenches shall be tested where required by the <br /> Engineer. Certified copies of all test results shall be provided to the County. <br /> F. Notification and Inspection <br /> 1. Consistent with Chapter 9 of these Standards, any developers, utilities, or others <br /> intending to trench in existing or proposed county right-of-way shall notify the <br /> Department of Planning and Development Services Inspection Section not less <br /> than 3 working days prior to performing the work. This notification shall include: <br /> 1. Location of the work <br /> ii. Permit number <br /> iii. Method of compaction to be used <br /> iv. Day and hour when compaction is to be done <br /> v. Day and hour when testing is to be done <br /> 2. As set forth in Chapter 9, failure to notify may necessitate testing or retesting by <br /> the County at the expense of the developer or utility. At the Engineer's discretion, <br /> the work may be suspended pending satisfactory test results. <br /> G. One Call System <br /> 1. Underground utilities shall comply with Chapter 19.122 RCW ("Underground <br /> Utilities"). For reference purposes,the Underground Utilities Location Center One <br /> Number Locater Services phone number is 811. <br /> 8-06 UTILITY INSTALLATION ON ROADWAY STRUCTURES <br /> A. General <br /> 1. Attachment of utility lines to a roadway structure, including bridges, may be <br /> allowed where such attachment conforms to sound engineering practice for <br /> preserving the roadway structure and ensuring its safe operation, maintenance <br /> and appearance. Attachment of any utility to any bridge within the county road <br /> right-of-way requires the approval of the County Bridge Engineer. <br /> 8-13 Engineering Design and Development Standards <br /> September 17, 2021 <br />