SECTION 623: DROP INLETS
623.1 Description
This Work consists of providi ng and installing drop inlets and junction boxes, and adjusting existing drop inlets.
623.2 Materials
The Contractor shall provide Class A concrete in accordance wi th Section 510, “Portland Cement Concrete.” The Contractor shall provide reinforcing ste el in accordance with Section 540, “Steel Reinforcement.” The Contractor shall provide Struc tural Steel in accordance with Section 541, “Steel Structures.” The Contractor shall provide coatings for Structural Steel in accordance with Section 545, “Protective Coating of Miscellaneous Structural Steel.” The Contractor shall provide pr eformed expansion joint filler in accordance with AASHTO M 213 . The Contractor shall provide precast units in accordance with Section 517, “Precast Concrete Structures.”
623.3 Construction Requirements
The Contractor shall construct drop inlets in accordance with Section 511, “Concrete Structures;” Section 540, “Steel Reinforcement;” and Section 54 1, “Steel Structures.” The Contractor shall precast the drop inlets and junction boxe s or cast in place. The Contractor shall raise the existing drop inlets by removin g and reconstructing the top six (6) inches of the existing Structure. The Contractor shall reuse the existing grate, but provide a new frame.
623.3.1 Foundation Requirements
The Contractor shall compact the foundations of drop inlets an d junction boxes to at least 95% of maximum density as determined by AASHTO T 180 (Modified Proctor), Method D (TTCP Modified), in accordance with Section 207, “Subgrade Prep aration.” The Contractor shall replace unstable Material with structural ly adequate Material before constructing new foundations.
623.3.2 Backfilling
The Contractor shall backfill in accordance with Section 206, “Excavation and Backfill for Culverts and Minor Structures.”
623.3.3 Coating of Structural Steel
The Contractor shall coat Structural Steel for drop inlets in accordance with Section 545, “Protective Coating of Miscellaneous Structural Steel.”
623.4 Method of Measurement
Section 623: Drop Inlets Page 701 The Department will measure rein forcing steel, concrete, and S tructural Steel for drop inlet extensions in accordance with Section 540, “Steel Reinfor cement,” Section 511, “Concrete Structures,” and Section 541, “Steel Structures,” res pectively.
623.5 Basis of Payment
Pay Item Pay Unit Median Drop Inlet, Type I, ___ to ___ ft Each Median Drop Inlet, Type ___ Each Modified Median Drop Inlet, Type___ Each Curb Drop Inlet Type___, ___ to ___ ft Each Curb Drop Inlet Type ___, over ___ ft Each Drop Inlet Type___, ___ to ___ ft Each Drop Inlet Type___, over ___ ft Each Transverse Drop Inlet Type ___, ___ to ___ ft Each Transverse Drop Inlet Type ___, over ___ ft Each Junction Box Each
623.5.1 Work Included in Payment
The following Work and items will be considered as included in the payment for the main items and will not be measured or paid for separately: 1. Subgrade preparation; 2. Compaction; 3. Replacement of unsuitabl e foundation Material; 4. Excavation and backfilling for drop inlets; 5. Coating of Structural Steel; 6. Reinforcing steel, concrete, and Structural Steel (Except on Extensions); 7. Removal of the top six (6 ) inches on extensions; 8. Gravel for drain pocket and hardware cloth for the weep hole s; and 9. De-watering. Section 624: Wire Mesh for Slope Stabilization Page 702