M 41-10 Page 7-177-07 Cleaning Existing Drainage Structures
7-07.1 Description
This Work consists of cleaning, removing, and disposing of all debris and obstructions from existing culvert pipes, storm sewer pipes, drains, inlet Structures, manholes, box culverts, grates, trash racks, or other drainage features within the limits of the project.
7-07.2 Vacant
7-07.3 Construction Requirements
All pipes and drainage Structures that require cleaning are identified in the Plans. They shall be cleaned by flushing, rodding, or whatever means are necessary to provide unobstructed drainage. All catch basin sumps, manholes, inlet and outlet Structures, and debris racks shall also be freed of all dirt, rock, and debris. Existing drainage facilities shall be cleaned as a first order of Work to enhance natural drainage off and through the project. They shall be kept clean throughout the life of the project and be clean upon final acceptance of the Work. Material to be removed shall be disposed of in the following manner:
1.Structures specifically noted in the Contract that are suspected to contain contaminated sediment shall be disposed of at a licensed disposal facility.
2.While performing the Work, if drainage water and/or soil appear oily, exhibit an unusual color or odor, or if staining or corrosion is observed, the Contractor shall stop work and immediately notify the Engineer. Additional work necessary in handling materials shall be in accordance with Section 1-04.4 .
3.If sediment and water from structures does not meet the conditions described in 1 or 2 above, material may be placed in an upland area with no possibility of surface runoff to waters of the State, including wetlands. While performing the Work, the Contractor shall implement all necessary best management practices and measures to meet the conditions of Section 1-07.5 .
7-07.4 Vacant
7-07.5 Payment
Payment will be made for the following Bid item when it is included in the Proposal: “Cleaning Existing Drainage Structure”, lump sum. The lump sum Contract price for “Cleaning Existing Drainage Structure” shall be full pay for performing all Work as specified. In the event the Contract does not include a Bid item for cleaning existing drainage Structure, such Work, if required, shall be performed by the Contractor in accordance with Section 1-04.4 . Cleaning Existing Drainage Structures 7-07
Source: Washington Standard Specifications for Road, Bridge, and Municipal Construction, 2024 Edition. Pages 709–709 of 1,151.