668Miscellaneous Drainage Structures

668.1General Description

This work includes constructing catch basins, drop inlets, manholes, junction boxes, spring boxes, drain inlets, special inlets with safety grates, and vertical tee sections. Construct according to these specifications and the lines and grades shown on the plans, or as established by the Engineer. 668.1.01 Definitions General Provisions 101 through 150. 668.1.02 Related References

General Provisions 101 through 150. 668.1.03 Submittals General Provisions 101 through 150. 1262 1262 1262 1262 1262

668.2Materials

The structures in this section may be constructed of brick, cast-in-place concrete, or pre-cast concrete, unless the plans or proposal specifies a specific type of construction. Use rubble masonry only when specified on the plans. Ensure that materials meet the following specifications: Material Section Class “A” or “B” Concrete 500 Sand for Bedding Material 801.2.01 Fine Aggregate for Mortar 801.2.02 Portland Cement 830.2.01 Brick 834 Masonry Stone 834 Mortar and Grout 834 Nonreinforced Concrete Pipe 843 Steel Bars for Reinforcement 853.2.01 Gray Iron Castings 854.2.01 Precast Reinforced Concrete Catch Basin, Drop Inlet, and Manhole Units 866 Ensure that the materials for fabricating special inlets and their safety grates are according to plan details. Construct the following manholes and drainage structures from pre-cast or cast-in-place concrete: • Structures within the backfill limits of mechanically stabilized embankment retaining walls • Structures within 5 ft. (1.5 m) of the wall foundation’s front. 668.2.01 Delivery, Storage, and Handling General Provisions 101 through 150.

668.3Construction Requirements

668.3.01 Personnel General Provisions 101 through 150. 668.3.02 Equipment General Provisions 101 through 150. 668.3.03 Preparation General Provisions 101 through 150. 668.3.04 Fabrication General Provisions 101 through 150. 1263 1263 1263 1263 1263

668.3.05 Construction

Excavate and prepare foundations for the structures included in this section; place pipe through the structures according to Section 207.

Concrete units may be either poured-in-place or precast. Construct units as follows:

The throat or other nonreinforced portions of catch basins may be Class B concrete. Use Class A concrete for the top slab. Construct units according to Section 500.

Construct pre-cast reinforced concrete units as follows:

Cast each unit with the number and dimensions of pipe holes necessary to incorporate the unit into the drainage system according to plan details. Installation conditions may require additional pipe for which no holes have been cast. If so, make the holes and repair or replace, to the Engineer’s satisfaction, pipe damaged during the process.

Use mortar or Class A concrete to connect pipe to units.

1) Pre-cast Reinforced Units: Set these units to within 1/2 in. (± 13 mm) of grade on a bed of compacted sand 2 in. to 3 in. (50 mm to 75 mm) thick. 2) Sectional Precast Reinforced Units: When using these units to build-up extra-depth catch basins or drop inlets, fill the joints between sections with mortar and wipe smooth.

Construct brick masonry structures according to Section 608.

Construct rubble masonry structures according to Section 607.

Hold frame castings securely in place to proper line and grade. Make castings an integral part of the complete structure. After completion, ensure that castings subject to traffic use are firm and stable under traffic.

Thoroughly clean fallen masonry, silt, debris, and other foreign matter from structures.

Fabricate safety grates according to plan details. 1264 1264 1264 1264 1264

Ensure that sanitary and combination sanitary and storm sewer manholes conform to the following requirements and the related specifications.

Shape invert channels to the lines and grades shown on the plans, or as established by the Engineer. Ensure that channel surfaces are smooth. Form invert channels by one of the following methods: • Directly form the invert channel in the concrete base of the manhole. • Construct the invert channel of brick and mortar. • Lay half-round tile in the concrete base of the manhole. • Lay round sewer pipe through the manhole and cut out the top half of the pipe after the concrete base has set. Do not use this method if the plans provide for an offset drop in the invert.

Plaster outside walls as follows:

according to Section 834 with the following exceptions: • Manufacture the mortar with one-part cement to two parts mortar sand. • Do not add hydrated lime.

Complete manhole connections to the Engineer’s satisfaction and as follows:

continuous sewage flow in existing lines. 668.3.06 Quality Acceptance General Provisions 101 through 150. 668.3.07 Contractor Warranty and Maintenance General Provisions 101 through 150.

668.4Measurement

Catch basins, drop inlets, manholes, junction boxes, drain inlets, special inlets, and safety grates, complete in place and accepted, are measured for payment according to the following:

Each catch basin or drop inlet is grouped for measurement as follows: • Group 1: Structures connected to pipe 36 in. (900 mm) or less in diameter, regardless of the pipe skew • Group 2: Structures connected to pipe over 36 in. (900 mm) diameter regardless of the pipe skew Catch basins or drop inlets, complete in place and accepted, are measured by the unit. In addition, each catch basin or drop inlet deeper than 6 ft. (1.8 m) is measured for additional payment. The extra depth is measured in linear feet (meters). 1265 1265 1265 1265 1265

Manholes are measured for payment as follows:

Sanitary sewer manholes and storm sewer manholes are measured separately and divided into two types: • Type 1: Structures connected to pipe 42 in. (1050 mm) or less in diameter regardless of the pipe skew • Type 2: Structures connected to pipe 48 in. to 84 in. (1200 mm to 2100 mm) diameter regardless of the pipe skew Each manhole is measured by the unit.

In addition to Types 1 and 2 above, each Manhole deeper than 6 ft. (1.8 m) is measured for additional payment, termed “manhole additional depth.” This additional depth is measured in linear feet (meters) and does not include the upper 6 ft. (1.8 m). Manhole additional depth is classed as follows: • Manhole Additional Depth, Class 1: Applies to each manhole deeper than 6 ft. (1.8 m), but not deeper than 10 ft. (3.0 m) Class 1 payment is for the manhole depth between 6 ft. and 10 ft. (1.8 m and 3.0 m). • Manhole Additional Depth, Class 2: Applies to each manhole deeper than 10 ft. (3.0 m), but not deeper than 20 ft. (6.1 m). Class 2 payment is for the manhole depth between 6 ft. and 20 ft. (1.8 m and 6.1.1 m). • Manhole Additional Depth, Class 3: Applies to each manhole deeper than 20 ft. (6.1 m), but not deeper than 30 ft. (9 m). Class 3 payment is for the manhole depth between 6 ft and 30 ft. (1.8 m and 9.1 m). • Manhole Additional Depth, Class 4: Applies to each manhole deeper than 30 ft. (9.1 m), but not deeper than 45 ft. (13.7 m). Class 4 payment is the manhole depth between 6 ft. and 45 ft. (1.8 m and 13.7 m). Manhole additional depth is measured for payment at the class that includes the greatest depth below the original 6 ft. (1.8 m). For example, a manhole 32 ft. (9.8 m) deep would be measured and paid for as follows: Storm (or sanitary) sewer manhole, type_____ Per each Storm (or sanitary) sewer manhole, type_____, additional Depth Class 4 26 linear feet (9 linear meters)

Junction boxes, spring boxes, and drain inlets are measured by the unit.

Safety grates fabricated and installed according to plan details are measured by the square foot (meter), computed from the overall surface dimensions of each grate.

Special inlets, complete in place, are measured for payment in cubic yards (meters) according to Section 500.

Vertical tee sections are not measured for separate payment. 668.4.01 Limits General Provisions 101 through 150. 1266 1266 1266 1266 1266

668.5Payment

Payment for the various structures under this Section will be made as follows:

Catch basins or drop inlets will be paid for at the Contract Price per each. Depth in excess of 6 ft. (1.8 m) will be paid for at the Contract Price per linear foot (meter). Payment is full compensation for the following: • Furnishing castings • Making pipe connections regardless of skew • Providing materials, making forms, and disposing of surplus material

Sanitary sewer and storm sewer manholes, complete in place, will be paid for at the Contract Price per each. Manhole additional depth of the appropriate class will be paid for at the Contract Price per linear foot (meter). Payment is full compensation for the following: • Furnishing castings, fittings, and other appurtenances called for on the plans to complete the Item • Making pipe connections regardless of skew • Providing materials, making forms, and disposing of surplus material NOTE: No additional payment will be made for connecting manholes to existing or new sewer lines. Include costs related to connections in the Contract Price for the structure.

Junction boxes, spring boxes, or drain inlets will be paid for at the Contract Price per each. Payment is full compensation for the following: • Furnishing castings, fittings, and other appurtenances called for on the plans to complete the Item • Making pipe connections regardless of skew • Providing materials, making forms, and disposing of surplus material

Pipe entering or exiting catch basins, drop inlets, manholes, junction boxes, spring boxes, or drain inlets, will be paid for under the section of the specifications governing the pipe.

No separate payment will be made for this material. Its cost is included in the Contract Price for the structure

under which it is used.

No separate payment will be made for excavation and normal backfill. Their cost is included in the Contract Price

for the structure being excavated.

Safety grates will be paid for at the Contract Price per square foot (meter).

Inlets for safety grates will be paid for at the Contract Price per cubic yard (meter) of Class “A” concrete, including

reinforcing steel.

Vertical tee sections will be included in payment for the section of structure they are incorporated in. 12671267126712671267

No separate payment will be made for excavation, backfill, and disposal of surplus material.

Payment will be made under:

Item No. 668 Catch basin, group_____ Per each

Item No. 668 Catch basin, group_____ additional depth Per linear foot (meter)

Item No. 668 Drop inlet, group_____ Per each

Item No. 668 Drop inlet, group_____ additional depth Per linear foot (meter)

Item No. 668 Sanitary sewer manhole, type_____ Per each

Item No. 668 Sanitary sewer manhole, type_____, additional depth class_____ Per linear foot (meter)

Item No. 668 Storm sewer manhole, type_____ Per each

Item No. 668 Storm sewer manhole, type_____, additional depth class_____ Per linear foot (meter)

Item No. 668 Junction box Per each

Item No. 668 Spring box Per each

Item No. 668 Drain inlet, __ in (mm) Per each

Item No. 668 Safety grate, type_____ Per square foot (meter)

Item No. 500 Class A concrete, including bar reinforcing steel Per cubic yard (meter)

668.5.01 Adjustments

General Provisions 101 through 150.. 1268 1268 1268 1268 1268