11831 AIRPORT RD WHOLE SITE FILE 2020-01-21

If the Engineer suspects that damage to any loop, not identified in the Plans as being replaced, may have resulted from Contractor's operations or is not operating adequately, the Engineer may order the Contractor to perform the field tests specified in Section 8 20.3(14)D. The test results shall be recorded and submitted to the Engineer. Loops that fail any of these tests shall be replaced. Loops that fail the tests, as described above, and are replaced shall be installed in accordance with current WSDOT design standards and Standard Plans, as determined by the Engineer. If traffic signal loops that fail the tests, as described above, are not replaced and operational within 48 hours, the Contractor shall install and maintain interim video detection until the replacement loops are operational. The type of interim video detection furnished shall be approved by the Engineer prior to installation. 8-20.3(14)C Loop Sealant Loop sealants shall be installed per manufacturer's recommendations. 3M Black 5000 sealant shall be installed so that the sealant is protected from wheel tracking prior to the sealant being fully cured. When 3M Black 5000 loop sealant is installed below the final lift of an HMA installation, a minimum of 5 consecutive days of cure time is required before the final lift is installed. 8-20.3(14)D Test for Induction Loops and Lead-in Cable Section 8-20.3(14)D is supplemented with the following: Induction Loop Tests Test A and Test D are revised as follows: Test A—The DC resistance between the 2 lead-in cable wires, including the loop, shall be measured by a volt ohmmeter. The resistance shall not exceed 5-ohms or lower the Q of the circuit below 5 where Q is equal to the "Inductive Impedance @ 50 kHz" divided by "Resistance". Test D - An inductance test shall be made to determine the inductance level of each inductance loop. The Contractor shall record the inductance level of each inductance loop installed on the project and shall furnish the findings to the Engineer. An induction level, as measured from the controller cabinet, below 50-microhenries is considered a failure. Existing Lead-in Cable Test When new induction loops are scheduled to be installed and spliced to an existing two- conductor shielded detector lead-in cable, the Contractor shall perform the following: 1. Disconnect the existing detector lead-in cable in the controller cabinet and at the loop splice. 2. Megger test both detector lead-in cable conductors. A resistance reading of less than 100-megohms is considered a failure. 3. Detector lead-in cables that fail the test shall be replaced and then retested. 4. After final testing of the detector lead-in cable, the loop installation shall be completed and the loop system tested according to Tests A, C and D. Swift Green Line—Corridor Stations Special Provisions SP137 May 2017