Attachment 2 - DU Specifications~1.pdf

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STANDARD CONSTRUCTION SPECIFICATIONS

GREAT PLAINS REGIONAL OFFICE

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STANDARD CONSTRUCTION SPECIFICATIONS

2009 EDITION

GREAT PLAINS REGIONAL OFFICE

TABLE OF CONTENTS

201 MOBILIZATION

202 SITE PREPARATION

203 EXCAVATION

204 EMBANKMENT CONSTRUCTION

205 WATER

206 CONSTRUCTED TOPOGRAPHY

301 WATER CONTROL STRUCTURES

302 STRUCTURE AND CULVERT APPURTENANCES

303 CULVERT AND PIPE INSTALLATION

304 CAST-IN-PLACE REINFORCED CONCRETE

305 RIPRAP, REVETMENT & AGGREGATE PLACEMENT

306 TOE DRAIN INSTALLATION

307 SHEET PILING

308 STEEL PILING

309 STRUCTURAL STEEL

311 REMOVAL OF EXISTING CULVERTS AND STRUCTURES

312 TILE DRAIN LOCATION AND REMOVAL

313 PUMP INSTALLATION

314 WATER WELL DRILLING

315 SUPPLY OF ELECTRICAL POWER

316 DIKE AND ACCESS ROAD SURFACING

317 FENCING

318 BUILDINGS

319 DECKING AND RAILING

320 WATER PIPELINE INSTALLATION

401 SOIL EROSION AND POLLUTION CONTROL

402 SEEDING AND MULCHING

403 HERBICIDE APPLICATION

404 TRAFFIC MAINTENANCE AND CONTROL

DU 201

201 MOBILIZATION

201.10 DESCRIPTION

The work shall include the supply of all labor, material and equipment to transport all needed labor, material and equipment to and from a project site to successfully complete that project as shown on the plans or described by the Engineer. When work consists of construction in a number of different locations at a given project site, mobilization shall include the transportation of the required labor, material and equipment between the various locations at the project site.

201.20 METHOD

The Contractor shall conduct all mobilization operations in a timely orderly, manner. Unless otherwise approved by the Engineer, mobilization operations shall commence no later than one week after the pre-construction meeting. Mobilization shall commence no later than one week after project completion and be finished within two weeks of project completion. During all operations, the Contractor is responsible for maintaining public and private property in original condition.

201.30 METHOD OF MEASUREMENT

Mobilization shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. Mobilization shall be measured in the following manner:

1) Lump Sum (LS): Mobilization shall be measured on a lump sum basis during completion of the entire project.

2) Each (EA): Mobilization shall be measured per (each) mobilization required to complete identified phases of a project that need to be completed at different construction times.

201.40 METHOD OF PAYMENT

The completed work for Mobilization, measured as specified, shall be paid for at the contract unit price.

Payment shall be made according to the following schedule:

1) 25% of contract unit price at project start up.

2) 50% of contract unit price at half project completion.

3) 100% of contract unit price at project completion.

The unit price bid for mobilization shall include supplying all materials, equipment, labor and any incidental items necessary for performing all mobilization operations described in this specification.

Unless separate mobilizations are required to completed different phases of the work shown on the plans, a Contractor may be eligible for a separate mobilization payment when the Contractor is required to discontinue work by the Corporation for reasons other than seasonal termination of work. The payment shall be commensurate to the amount of equipment and materials that are required to be removed from the project site and that payment shall not exceed the original unit price specified for mobilization.

DU 202

202 SITE PREPARATION

202.10 DESCRIPTION

This specification shall cover the supply of all labor, materials, and equipment required for clearing and grubbing, and site preparation. The work shall include:

a) Removal from site and disposal of all trees, roots, brush, stone, rubbish and all other surface litter in designated areas by burying or burning.

b) Coordination of necessary clearing and grubbing operations to allow timely completion of construction staking of a project.

c) Grubbing to remove grass and debris.

d) Stripping of six (6) inches of topsoil and re-spreading after construction is completed, unless otherwise specified on the plans.

e) Final clean up of the site prior to demobilization will require the spreading and shaping of all materials stockpiled or moved to facilitate construction including but not limited to vegetative material.

202.20 CONSTRUCTION METHODS

Clearing shall consist of the cutting, removing, disposal and cleaning up of all timber, brush and fallen timber, stumps, shrubs, and rubbish. Trees and shrubs designated for preservation shall be marked and protected from scoring, barking or other injury during construction operations.

Grubbing shall consist of the removal and disposal of all roots, stumps, imbedded logs or objectionable debris to a depth of not less than twelve (12) inches below the original ground surface. Where no trees or brush exist, grubbing shall consist of removal of grass and debris prior to placement of fill material.

Topsoil stripping and stockpiling shall be performed for the footprint of all embankments and at the surface area of all excavations and at the base of temporary stockpiles and waste area unless otherwise noted on the plans. Unless otherwise specified, upon completion of the construction, the stockpiled material shall be spread and finished to a reasonably smooth surface.

Trees, logs, stumps, brush and other debris shall be burned and buried or chipped, or disposed of in areas designated by the Engineer. All burning is subject to local or state ordinances. Areas such as borrows, pits, and excavations so designated shall be left in a neat and finished appearance free from debris. All materials disposed of shall be covered with clean fill and leveled in such a way as to promote drainage.

202.30 METHOD OF MEASUREMENT

Site preparation shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. Site preparation shall be measured in the following manner:

1) Lump Sum (LS): Site preparation shall be measured on a lump sum basis of site preparation operations. No separate measurement will be made for topsoil removal and replacement, clearing and grubbing or coordination of clearing and grubbing operations for construction staking.

2) Cubic Yard-Plan (CY-P): Site preparation shall be measured on a plan quantity basis of site preparation operations. This quantity shall be the neat line site preparation quantity for the specified depth at the footprint of the embankment or the surface area of potholes and channels as

DU 202

calculated from the construction plans. This measurement shall not include clearing and grubbing or topsoil stripping and stockpiling of borrow areas as these quantities are considered incidental to embankment construction unless otherwise noted on the plans. No separate measurement for clearing and grubbing or coordination of clearing and grubbing operations for construction staking will be made.

3) Cubic Yard-Staked Quantity (CY-S): Site Preparation shall be measured on a staked quantity basis of site preparation operations. This quantity shall be the area of work, as determined by superimposing the construction staking notes on the original ground elevations, multiplied by the specified depth. This measurement shall not include clearing and grubbing or topsoil stripping and stockpiling of borrow areas as these quantities are considered incidental to embankment construction unless otherwise noted on the plans. No separate measurement for clearing and grubbing or coordination of clearing and grubbing operations for construction staking will be made.

4) Linear Feet (LF): Site preparation shall be measured on a linear feet basis. The length shall be the actual staked centerline distance of site preparation completed according to plans and specifications.

5) Acre (AC): Site preparation shall be measured on an acre basis. The dimension shall be the actual staked outside dimensions of site preparation completed according to plans and specifications.

6) Hourly-Recorded (HR-R): Site preparation shall be measured on a per diem basis. The per diem basis shall be the actual hours as recorded from an approved rpm/hr recording system for each piece of equipment used to complete the excavation portion of this project. No separate recording shall be made for mobilization and idling of equipment, unless otherwise specified.

When Site Preparation is not listed on the Standard Bid Form or when a unit price bid has not been entered for Site Preparation, it shall be considered incidental to the excavation, embankment, structure, and piping operations and no measurement shall be made.

202.40 METHOD OF PAYMENT

The completed work for site preparation, measured as specified, shall be paid for at the contract unit price. The unit price bid for site preparation shall include supplying all materials, equipment, labor and any incidental items necessary for performing all site preparation operations described in this specification.

DU 203

203 EXCAVATION

203.10 DESCRIPTION

This specification shall cover the supply of all labor, materials, and equipment required for the excavation, hauling and spreading of materials from within the limits of the cut area as shown on the plans, including but not limited to, excavation of designated areas; peninsula cutoffs; silt removal; pothole and dugout construction; and key trench construction. The work shall include control of water during excavation, the shaping of slopes to the lines and grades shown on the drawings and the disposal of materials within designated areas. Unless otherwise specified, all material to be excavated shall be considered unclassified regardless of their nature or the manner in which they are removed. In the case that drilling and blasting is required, due to size of density of rock encountered, extra work will be considered.

203.20 CONSTRUCTION METHODS

203.21 SITE PREPARATION

Prior to any excavation, sites shall be cleared and grubbed with topsoil removed in accordance with the specification for SITE PREPARATION. Material cleared and grubbed shall be disposed of per the Engineer's directions. Topsoil removed shall be stockpiled and later re-spread on those areas at a thickness of four (4) inches, unless otherwise specified.

203.22 EXCAVATION

Excavation shall mean the removal of all materials encountered within the limits of excavation as shown on the drawings or as staked by the Engineer. Excavation shall be performed in as nearly a continuous operation as possible, trimmed and leveled to conform to the required lines, grades and tolerances. Areas over-excavated shall be replaced with suitable materials compacted to a density at least equal to that of the in-situ material or to the satisfaction of the Engineer.

Suitable material excavated from the excavation areas shown on the plans shall be used in any embankments called for on the plans. This shall include areas stripped of topsoil or unsuitable material that need to be backfilled with suitable material or key trenches. Placement of these embankments or backfills shall be done in accordance with the specification for EMBANKMENT CONSTRUCTION.

Excavated material unsuitable for embankments shall be deposited in locations shown on the plans or as directed by the Engineer. Unsuitable excavated materials shall be deposited as uniformly and continuously as possible in successive layers. No specific compaction will be required but where the material is placed with equipment other than tractor scrapers, blading and leveling is required to minimize voids. The fill shall be leveled upon completion to conform to lines and grades and enable the area to be seeded.

Rock excavation operations shall be controlled by the Contractor to produce the size gradations specified for other parts of the work, if the rock is designated by the Engineer as suitable for use.

203.23 DISPOSAL OF WASTE MATERIALS

All surplus or unsuitable excavated materials designated as waste by the Engineer shall be disposed of at the locations shown on the plans or as directed by the Engineer.

DU 203

203.24 CONTROL OF SURFACE AND SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work.

Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

It is the responsibility of the Contractor to control the surface and sub-surface water and drainage in any excavation area, dewatering placement area and borrow area. Should material quality lessen through inadequate drainage, the Contractor may be directed by the Engineer to construct drainage facilities or develop an alternate borrow area at the Contractor’s expense.

203.30 METHOD OF MEASUREMENT

Excavation shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. No measurement for over-excavation shall be made. Excavation shall be measured in the following manner:

1) Lump Sum (LS): Excavation shall be measured on a lump sum basis and no separate measure-ment shall be made for the volume of material excavated.

2) Cubic Yards-Plan Quantity (CY-P): Excavation shall be measured on a plan quantity basis. This quantity shall be the neat line excavation quantities calculated from the construction plans.

3) Cubic Yards-Staked Quantity (CY-S): Excavation shall be measured on a staked quantity basis.

The quantity shall be calculated by superimposing construction staking notes on original ground and using average end area methods of volume calculation.

4) Cubic Yards (CY): Excavation shall be measured on a volume basis. The volume to be paid for shall be made by superimposing final cross- sections on applicable stripped or original ground profile sections and using average end area methods of volume calculation. No measurement for overexcavated materials shall be made.

5) Linear Feet (LF): Excavation shall be measured on a linear feet basis. The length shall be the actual staked centerline distance of excavation completed according to plans and specifications.

6) Hourly-Recorded (HR-R): Excavation shall be measured on a per diem basis. The per diem basis shall be the actual hours as recorded from an approved rpm/hr recording system for each piece of equipment used to complete the excavation operations. No separate recording shall be made for mobilization and idling of equipment, unless otherwise specified.

When a unit price bid has not been entered for Excavation, it shall be considered incidental to the embankment, structure, and piping operations and no measurement shall be made.

203.40 METHOD OF PAYMENT

The completed work for excavation, measured as specified, shall be paid for at the contract unit price.

The unit price bid for excavation shall include supplying all materials, equipment, labor and any incidental items necessary for performing all excavation operations described in this specification. No payment shall be made for dewatering or the control and drainage of surface/sub-surface water. No payment for excavation of suitable material will be made when excavating in a designated borrow area to obtain material that is to be placed, measured and paid in accordance with the specification for

EMBANKMENT CONSTRUCTION.

DU 204

204 EMBANKMENT CONSTRUCTION

204.10 DESCRIPTION

The work shall include the supply of all labor, material and equipment required to complete the construction of key trenches, dams, dikes, berms, levees or roadway embankments as shown on the plans and as staked in the field. The work shall include:

a) Excavation of suitable materials from borrows or excavations.

b) Placement of materials from designated borrow areas or excavation into embankments such as dams, dikes, berms, levees or roadways.

c) Leveling and trimming of embankments and borrow areas.

204.20 CONSTRUCTION METHODS

204.21 SITE PREPARATION

Prior to any embankment or key trench construction, sites shall be cleared and grubbed with topsoil removed in accordance with the specification for SITE PREPARATION. Material cleared and grubbed shall be disposed of per the Engineer's directions. Topsoil removed shall be stockpiled and later re-spread on those areas at a thickness of four (4) inches, unless otherwise shown on the plans.

204.22 FILL MATERIAL

Unless otherwise specified, all material shall be placed in loose lifts of not more than eight (8) inches thickness and shall be compacted by suitable compaction equipment to a minimum of 95% of maximum density as determined by the Standard Proctor Method ASTM D698. Moisture content shall be in the range of -l% to +3% of optimum moisture content. Field tests conforming to standard ASTM testing methods will be scheduled at the discretion of the Engineer to ensure compliance with these specifications.

If material is placed into embankments during freezing conditions, any frost developed during embankment construction shall be removed prior to continuing fill operations. Embankments shall not be constructed during periods when the embankment material freezes while being placed and compacted.

Fill material shall be free from boulders, concrete, snow, stumps or other vegetation.

204.23 KEY TRENCH CONSTRUCTION

The Contractor shall not commence key trench construction until such work as specified in the specification for SITE PREPARATION has been completed to the satisfaction of the Engineer.

Where specified on the plans, the key trench excavation shall be made to the lines and grades shown on the drawings but may be altered during construction upon the direction of the Engineer to adjust for variation in soil conditions. Excavated material, if acceptable in quality to the Engineer, may be stockpiled for use in site preparation or embankment construction. Unacceptable materials shall be disposed of by placing into designated areas. The key trench completed to the original ground surface elevation shall be rough leveled prior to commencing embankment construction.

204.24 EMBANKMENT CONSTRUCTION

The Contractor shall not commence embankment construction until such work as specified in the specification for SITE PREPARATION and the key trench, where specified, has been completed to the satisfaction of the Engineer.

Embankment material excavated from ditches/borrows with tractor-scraper units shall be placed in successive layers across the entire width of the embankment. Each layer must be spread as deposited longitudinally along the embankment with each layer not exceeding eight (8) inches in thickness. With the Engineer's approval, the initial layer may be increased in thickness in wet areas to provide a working pad capable of supporting the hauling equipment. The embankment at all times must be maintained in a reasonably level condition and hauling equipment shall be directed over the full width of each layer to facilitate uniform compaction. Adequate equipment shall be used to obtain the minimum compaction specified in Section 204.22 of this specification.

Where embankment material is excavated with bucket equipment from ditches or borrow, it shall be deposited into the embankment within reach of the equipment. To prevent berm failure, stock piling on berms will not be permitted. Materials shall be placed and spread in layers with each layer after spreading not to exceed eight (8) inches in thickness.

All embankments will be construction staked to final grade elevations shown on the drawings.

Embankments shall be brought to these elevations using embankment material graded to a tolerance of +/-

0.1 feet. Topsoil or riprap materials are to be placed on top of embankment construction. Topsoil depths shall be four (4) inches, unless otherwise specified, while riprap depths shall be as specified on the drawings. All embankment construction must be as continuous as possible and the fill maintained such that drainage is assured at all times.

Should fill settlement occur during the construction of the embankment and within seven days of substantial completion, and prior to acceptance of the work, additional material shall be placed and trimmed to achieve final grade by the Contractor at his own expense. After embankments have been constructed to grade, they shall be leveled and trimmed to conform to the lines, grades and cross-sections shown on the plans and/or as staked. Acceptance of finished embankment may be made progressively during the course of construction upon the request of the Contractor. A completed embankment once accepted by the Engineer shall not be used by the Contractor for haulage, access or other purposes without the consent of the Engineer.

Water used in conjunction with embankment construction activities shall be applied and paid as described in the specification for WATER.

Cold weather embankment construction - Embankment construction may not proceed if material freezes while being placed and compacted however when weather conditions are such that embankment construction may proceed, the contractor may be permitted to excavate any frozen foundation soils or previously installed fill and proceed with the embankment construction for so long as weather will permit, but only if and to the extent approved by the engineer and with the understanding that additional costs involved shall be borne by the contractor. The frozen soil shall be wasted and replaced with other suitable soil as may be necessary to construct the embankments as specified.

204.25 TRIMMING

The crest, side slopes and berms of the embankment shall be leveled and trimmed to conform to the lines and grades shown on the drawings. The crest shall be constructed to the elevation shown on the plans prior to acceptance of the work. Acceptance of the finished embankment may be made progressively during the course of construction upon the request of the Contractor. Once accepted by the Engineer, the Contractor shall not use a completed embankment for haulage, access or other purposes.

204.26 HAUL ROADS AND BORROW AREAS

The construction, maintenance and removal of all haul roads from the borrow areas shall be the responsibility of the Contractor and be considered incidental to the work. Borrow areas shall be maintained during construction in a graded condition such that drainage is assured and that operations can resume quickly after precipitation periods. No borrow shall be obtain outside of designated borrow areas or designated depths or elevations without approval from the engineer, responsible agency and landowner. Following completion of the work, borrows are to be left in a graded condition acceptable to the Engineer and all haul roads, access roads and temporary crossings are to be removed.

204.27 CONTROL OF SURFACE AND SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work.

Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

It is the responsibility of the Contractor to control the surface and sub-surface water and drainage in any excavation area, dewatering placement area and borrow area. Should material quality lessen through inadequate drainage, the Contractor may be directed by the Engineer to construct drainage facilities at the Contractor’s expense.

204.30 METHOD OF MEASUREMENT

Embankment construction shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. No measurement for embankment constructed beyond the staked limits will be made. Embankment construction shall be measured in the following manner:

1) Lump Sum (LS): Embankment shall be measured on a lump sum basis of placed embankment.

No separate volume measurement shall be made.

2) Cubic Yard-Plan Quantity (CY-P): Embankment shall be measured on a plan quantity basis. This quantity shall be the neat line quantity of placed embankment including site preparation calculated from the construction plans. This measurement shall also include site preparation quantities. Site preparation quantities to be added to embankment quantities shall be calculated as described in the specification for SITE PREPARATION. This measurement shall not include clearing and grubbing or topsoil stripping and stockpiling of borrow areas as these quantities are considered incidental to embankment construction.

3) Cubic Yard-Staked Quantity (CY-S): Embankment shall be measured on a staked quantity basis of placed embankment. This quantity shall be measured by superimposing the construction staking notes on the original ground elevations and using the average end method of volume calculation. This measurement shall also include site preparation quantities. Site preparation quantities to be added to embankment quantities shall be calculated as described in the specification for SITE PREPARATION. When indicated on the plans or unit table, an appropriate shrinkage factor will be applied to this calculation. This measurement shall not include clearing and grubbing or topsoil stripping and stockpiling of borrow areas as these quantities are considered incidental to embankment construction unless otherwise indicated on the plans or unit price table.

4) Cubic Yards (CY): Embankment shall be measured on a volume basis of placed embankment.

The volume to be paid for shall be made by cross sectioning designated borrow areas minus topsoil quantities and using the average end method of volume calculation. No measurement shall be made for overbuild areas.

5) Linear Feet (LF): Embankment shall be paid on a linear feet basis. This quantity shall be measured by the actual staked centerline distance of all embankment constructed according to plans and specifications.

6) Hourly-Recorded (HR-R): Embankment shall be measured on a per diem basis. The per diem basis shall be the actual hours as recorded from an approved rpm/hr recording system for each piece of equipment used to complete the embankment operations. No separate recording shall be made for mobilization and idling of equipment, unless otherwise specified.

No separate measurement shall be made for the fill around pipes, pipeline, and water control structures.

This work shall be considered incidental to those bid items.

204.40 METHOD OF PAYMENT

The completed work for embankment construction, measured as specified, shall be paid for at the contract unit price. The unit price bid for embankment construction shall include supplying all materials, equipment, labor, and any incidental items necessary for performing all embankment construction operations described in this specification. No payment shall be made for dewatering or the control and drainage of surface/sub-surface water.

DU 205

205 WATER

205.10 DESCRIPTION

The work shall include the supply of all labor, material, and equipment required to add water to embankments as directed by the Engineer. The work shall include:

a) Locating and procuring a suitable water source.

b) Delivery of water to the site, applying and mixing water with embankment material.

205.20 MATERIALS

Water used for construction shall be reasonably clean and shall not affect normal soil characteristics.

205.30 CONSTRUCTION METHODS

Water shall be applied to the embankment areas (or borrow areas) in a way that maintains the specified moisture content. Sufficient equipment shall be on the project site to secure and maintain the specified moisture content until the required density is secured. Water shall be applied uniformly over the working area.

205.40 METHOD OF MEASUREMENT

Water shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. Water shall be measured in the following manner: Note MGAL is defined as 1000 gallons.

1) Lump Sum (LS): Water shall be measured on a lump sum basis for applied water. No separate measurement shall be made.

2) MGAL - Plan Quantity (MG-P): Water shall be measured on a plan quantity basis. The quantity shall be the one thousand gallon (KGAL) increments as calculated using soil investigation information and listed on the plans or shown on the Standard Bid Form. No measurement shall be made for the volume of water applied.

3) MGAL - (MG): Water shall be measured on a volume basis. The water measured shall be the actual amount of applied water in one thousand-gallon (KGAL) increments used in the construction of the project. The amount used shall be measured in the field as agreed to by the Contractor and the Engineer.

205.50 METHOD OF PAYMENT

The completed work for water, measured as specified, shall be paid for at the contract unit price. The unit price bid for water shall include supplying all materials, equipment, labor and any incidental items necessary for performing all water operations described in this specification.

DU 206

206 CONSTRUCTED TOPOGRAPHY

206.10 DESCRIPTION

This specification shall cover the supply of all labor, materials, and equipment required for the construction of potholes, dugouts, basins, meandered channels, or other topographic reconstruction as shown on the plans. The work shall include the excavation, hauling and spreading of materials from within the limits of the cut area, control of water during excavation, the shaping of slopes to the lines and grades shown on the drawings and the disposal of materials within designated areas.

206.20 CONSTRUCTION METHODS

206.21 SITE PREPARATION

Prior to any excavation, sites shall be cleared and grubbed with topsoil removed in accordance with the specification for SITE PREPARATION. Material cleared and grubbed shall be disposed of per the Engineer's directions. Unless otherwise specified, the debris shall be placed in the spoil areas and secured by incorporating it into the earth fill. Preparation of the site shall be done in a manner that destroys as little vegetation as feasible outside the area to be occupied by the topographic feature and the associated spoil areas. Topsoil removed shall be stockpiled and later re-spread on those areas at a thickness of four

(4) inches, unless otherwise specified.

206.22 EXCAVATION

Excavation shall mean the removal of all materials encountered within the limits of excavation as shown on the drawings or as staked by the Engineer. Excavation shall be performed in as nearly a continuous operation as possible to conform to the required lines, grades and tolerances. Areas over-excavated shall be replaced with suitable materials compacted to a density at least equal to that of the in-situ material or to the satisfaction of the Engineer. The depth specified is nominal so the actual depth may vary 3 inches (0.25’) above and below the specified depth. The side slopes of the excavated basins shall be free of abrupt changes and blend into the existing ground contours.

Connection ditches shall have 3:1 or flatter side slopes. For curved segments, a scour hole effect shall be obtained by over-excavating the outside of the ditch with the inside of the curve being shallower.

Material excavated from the designated locations shall be used to create multiple upland habitat conditions based on the height, shape, and location of habitat mounds. Where designated on plans, spoil shaped into a mound shall be placed 25 to 30 feet from edge of basin. The side slopes of the mound shall be 6:1 or flatter. Large spoil areas may be shaped into multiple mounds. The completed earth fill in the mounds and ridges shall be left rough graded such that the area can be reseeded using conventional seeding equipment. No compaction of the earth fill will be required. Where designated on plans, spoil shaped into a ridge shall be continuous, with a minimum height of 1 foot. The ridge shall be used on the down slope side of a basin to impound additional water over the basin area. Unless otherwise specified, all material to be excavated shall be considered unclassified regardless of their nature or the manner in which they are removed.

206.23 CONTROL OF SURFACE AND SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work.

Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

It is the responsibility of the Contractor to control the surface and sub-surface water and drainage in any excavation area, dewatering placement area and borrow area. Should material quality lessen through inadequate drainage, the Contractor may be directed by the Engineer to construct drainage facilities at the Contractor’s expense.

206.30 METHOD OF MEASUREMENT

Constructed topography shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Standard Bid Form for the pay item corresponding to this specification number. The Standard Bid Form shall list the appropriate unit of measurement for each applicable feature, i.e., potholes, dugouts, channels, etc. Constructed Topography shall be measured in the following manner:

1) Lump Sum (LS): Topographic features shall be measured on a lump sum basis and no separate measurement shall be made for the volume of material excavated.

2) Acre-Plan Quantity (AC-P): Surface areas shall be measured on a plan quantity basis. This quantity shall be the neat line areas as calculated from the construction plans.

3) Cubic Yards-Plan Quantity (CY-P): Topographic features shall be measured on a plan quantity basis. This quantity shall be the neat line excavation quantities calculated from the plans.

4) Cubic Yards-Staked Quantity (CY-S): Topographic features shall be measured on a staked quantity basis. The quantity shall be calculated by superimposing construction staking notes on original ground and using average end area methods of volume calculation.

5) Cubic Yards (CY): Embankment shall be measured on a volume basis of placed embankment.

The volume to be paid for shall be made by cross sectioning designated borrow areas minus topsoil quantities and using the average end method of volume calculation. No measurement shall be made for overbuild areas.

6) Linear Feet (LF): Topographic features shall be measured on a linear feet basis. The length shall be the actual staked centerline distance of excavation completed according to plans and specifications. No measurement shall be made for over-excavation, or excavation quantities or operations conducted outside of given stakes.

7) Each (EA): Topographic features shall be measured on an individual feature basis. The estimated number of features will be shown on the Standard Bid Form. The volume of material excavated from individual sites will vary. A neat line plan quantity estimate of material to be excavated will be shown on the plans.

8) Hourly-Recorded (HR-R): Topographic features shall be measured on a per diem basis. The per diem basis shall be the actual hours as recorded from an approved rpm/hr recording system for each piece of equipment used to complete the constructed topography operations. No separate recording shall be made for mobilization and idling of equipment, unless otherwise specified.

Mobilization of equipment between the individual feature sites will not be measured. This work shall be considered incidental to the construction of the topographic feature.

206.40 METHOD OF PAYMENT

The completed work for constructed topography, measured as specified, shall be paid for at the contract unit price. The unit price bid for constructed topography shall include supplying all materials, equipment, labor, and any incidental items necessary for performing all operations described in this specification. No payment shall be made for dewatering or the control and drainage of surface/sub-surface water. No payment for excavation of suitable material will be made when excavating in a designated borrow area to obtain material that is to be placed, measured and paid in accordance with the specification for

EMBANKMENT CONSTRUCTION.

DU 301

301 WATER CONTROL STRUCTURES

301.l0 DESCRIPTION

The work of this section shall include the supply of all labor, materials, and equipment required to complete the installation of the water control structures as called for on the drawings and/or specified herein. These water control structures may include but are not limited to the following:

a) Stoplog control structures

b) Gate control structures

c) Fixed level control structures

d) Any other structures specified on the plans

This work shall consist of coupling the structure to the pipe; excavation; bed preparation; installation of structure and associated hardware with the use of a concrete base pad or form, reinforcement, and concrete placement, or framing and supports as shown on the plans. Work shall also include the supply, placing and compaction of backfill to the lines and grades shown on the drawings or as specified.

301.20 MATERIALS

301.21 SUPPLY OF MATERIALS

Unless otherwise specified, the Contractor shall supply all couplers, nuts, bolts, riser controls, stoplog channels, sealants, and all accessories necessary to complete the installation as shown on the plans or recommended by the material manufacturer.

The structure material, diameter and length shall be as specified on the plans. All culverts, inlet and outlet pipes, and appurtenances shall match the material and coating of the base riser unless otherwise specified on the plans. All materials supplied by the Contractor shall be subject to inspection by the Engineer.

The following specifications for each material type shall be adhered to.

1) Aluminum corrugated metal pipe risers. The minimum acceptable series for aluminum CMP shall be 3000 Series. The material shall meet the requirements of AASHTO M197.

a) Pipe shall be close riveted or of a "lock seam" construction. Unless otherwise specified all pipes shall have a 2-2/3" x 1/2" corrugation. The gauge of the pipe shall be as follows unless otherwise specified on the plans:

Pipe Diameter

2-2/3” x ½” Corrugations Metal Thickness

3” x 1” Corrugations Metal Thickness

12"-21" 14 NA

24"-36" 12 14 42"-54" 10 12 60"-96" 8 10

b) All welds shall be 3/16” fillets unless otherwise specified on the plans and should conform to Welded Joint Requirements of the latest edition of the AISC Manual. All bolted connections shall utilize stainless steel bolts, nuts, and washers, grade 18-8 or 304 or better.

c) The minimum acceptable series for all structural aluminum, channels, angles, plates, rounds, etc. shall be 5000 Series, unless otherwise specified.

d) The portion of the riser that will be embedded in the concrete base shall be coated with asphalt mastic prior to installation.

2) Steel corrugated metal pipe risers. Where stated as acceptable on the plans, steel corrugated metal risers shall be made of galvanized or aluminized Type II steel. Galvanized steel corrugated metal pipe shall meet the composition requirements of AASHTO M218. The aluminized Type II steel shall conform to the requirements of AASHTO M274.

a) Pipe shall be close riveted or of a "lock seam" construction. Unless otherwise specified all pipes shall have a 2 2/3" x 1/2" corrugation. The gauge of the pipe shall be as follows

2-2/3” x ½” Corrugations Metal Thickness

3” x 1” Corrugations Metal Thickness

12"-21" 16 NA

24"-36" 14 16 42"-54" 12 14 60"-96" 10 12

b) Risers made of galvanized or aluminized Type II steel shall be coated unless otherwise indicated on the plans. This coating shall be a 10 mil polymeric film laminate. The coatings shall be applied to both the inside and outside of the riser.

c) All welds shall be 3/16” fillets unless otherwise specified on the plans and should conform to Welded Joint Requirements of the latest edition of the AISC Manual. All cuts and welds required for riser fabrication shall be brushed or sprayed with a bituminous coating.

3) Pre-cast concrete risers. Where stated as acceptable on the plans, pre-cast concrete structures shall conform to the requirements of ASTM C478. The risers shall be of the length shown on the plans. All pipe shall be connected to the riser utilizing a flexible watertight connector as shown on the plans or as approved by the Engineer.

4) Fiberglass, High Density Polyethylene (HDPE) Pipe, and Polyvinyl Chloride (PVC) Pipe Risers.

Where stated as acceptable on the plans, Fiberglass, HDPE, and PVC risers shall be approved by the Engineer and shall be of the length shown on the Plans.

a) The minimum acceptable series for all structural aluminum, channels, angles, plates, rounds, etc. shall be 5000 Series, unless otherwise specified.

b) All bolted connections shall utilize stainless steel bolts, nuts and washers, grade 18-8 or

304 or better.

c) The pipe stubs for the structure shall incorporate a gasketed bell and spigot design or engineer approved alternate with the ability to accept watertight HDPE or PVC pipe. The gasketed joint shall meet the requirements of ASTM F477 with a minimum watertight performance of 10.8 psi. 36” through 60” diameters shall have a reinforced bell and spigot.

d) The structure manufacturer shall weld and/or bond all stub joints on both the interior and exterior of the riser.

e) Fiberglass risers shall be of three-piece construction. The two-piece exterior shell shall consist of two molded fiberglass shells with reinforcing ribs and flanges. The fiberglass shall be a polyester resin. The center stop gate shall be of polyethylene construction.

f) HDPE risers shall have a smooth interior and annular exterior corrugations. The Engineer shall approve the pipe utilized for the structure. The material shall meet the requirements of ASTM D3350 with a minimum cell classification 335420C. 12” to 48” risers shall meet the requirements of AASHTO M294, Type S. 54” and 60” risers shall meet the requirements of AASHTO MP7.

g) PVC structure shall be constructed of ½” thick or greater extruded pvc sheets, connected by anodized aluminum corners, sealed with waterproof caulking, and secured with stainless steel connections. The structure shall be similar to the inline water level control structure as manufactured by Agri-Drain Corp., or approved equal. Structure shall include a metal lid with attachment accessories.

5) Where called for the plans, annular connecting bands shall be the same material and have the same coating, corrugations, and gauge as specified for the pipe that is to be connected.

a) The connecting bands shall be either 24” in width or have a minimum of nine (9) corrugations. The minimum circumferential overlap shall be six (6) inches. If helical pipe is used, a minimum of four (4) re-rolled annular corrugations shall be formed to allow the use of the annular overlapping connecting bands.

b) To provide for a watertight joint, a closed cell expanded gasket or engineer approved equal shall be used in conjunction with connecting band. The gasket shall be at least 24” in width, 3/8” thick, with an unstretched diameter ten (10) percent less than normal pipe size and shall comply with ASTM D1056, Grade SCE-43. Mastic shall be placed on each side of the gasket.

c) The binders for the connecting bands will consist of a minimum of 6 rods and tank lugs, three (3) per side, in accordance with the plans. The minimum rod diameter shall be 7/16” with ½” threads. All rods and lugs shall be galvanized.

6) When called for on the plans, the Contractor shall supply to the site ready mix concrete, or site mix concrete in accordance with the specification for CAST-IN-PLACE REINFORCED CONCRETE. Forms, reinforcing steel or wire mesh, for the concrete pad for the control structure will be the responsibility of the Contractor. Installation of a concrete base for all prefabricated risers shall be considered incidental to the riser installation and no separate measurement or payment shall be made for this work.

301.22 HANDLING AND STORAGE OF MATERIALS

All materials shall be handled and stored in careful and workmanlike manner to the satisfaction of the Engineer. Any dents or depressions as a result of storage and handling during transportation or installation shall not be allowed. The Contractor shall be responsible for replacement and reinstallation of the damaged riser at his own expense.

301.30 CONSTRUCTION METHODS

301.31 CONTROL OF SURFACE/SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work.

Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

It is the responsibility of the Contractor to control the surface and sub-surface water and drainage in any excavation area, dewatering placement area and borrow area. Should material quality lessen through inadequate drainage, the Contractor may be directed by the Engineer to construct drainage facilities at the Contractor’s expense.

301.32 CMP, FIBERGLASS, HDPE, & PVC CONTROL STRUCTURE INSTALLATION

Prior to installation of the control structure, any protective coating that has been removed from the structure exposing the pipe shall be recoated. Welding, drilling, bolting or otherwise attaching devices, temporary or permanent, to the structure to assist in structure installation is prohibited.

The Contractor shall compact the in-situ material below the base elevation prior to assembly and erection of the structure. This bed shall be fully leveled and compacted throughout the full width and length of the trench and to the exact grade as specified, so that the structure shall be uniformly and evenly supported across its footprint.

The control structure, as delivered to the site, shall be cast-in-place into the concrete foundation or as shown on the plans. Cast-in-place concrete, reinforcing, mixing, delivery and placement shall be carried out in accordance with the specification for CAST-IN-PLACE REINFORCED CONCRETE.

The structure shall be supported with adequate falsework so as to maintain the lines and grades shown on the plans, and to maintain those lines and grades without movement, until the concrete has reached the strength as specified herein.

Care shall be taken in the placement of the concrete so as not to splash concrete on the control structure.

All concrete splashed on the structure shall be cleaned off immediately, to the satisfaction of the Engineer.

Contractor shall install the bottom stoplog as shown on the plans. All other stoplogs, slide gates, tiedowns, lock, grating, railing, and assembly tools shall be removed from the control structure prior to installation of the control structure in the concrete base. All of these items shall be re-installed after completion of structure installation.

Falsework, chairs, or supportive devices used in supporting the control structure in the formwork, and to be permanently incorporated in the concrete shall be of the same material and shall be considered as reinforcement. All such falsework, chairs, and supportive devices shall be approved by the Engineer prior to installation. No supportive devices shall protrude from the finished surface of the concrete, unless approved by the Engineer.

Culvert assembly and installation shall be carried out in accordance with the specification for CULVERT

AND PIPE INSTALLATION.

301.33 CONCRETE CONTROL STRUCTURE INSTALLATION

The Contractor shall compact the in-situ material below the base elevation prior to assembly and erection of the structure. This bed shall be fully leveled and compacted throughout the full width and length of the trench and to the exact grade as specified, so that the structure shall be uniformly and evenly supported across its footprint.

The control structure shall be set or cast-in-place to the lines and grades shown on the plans.

Reinforcement, stoplog channels, gate bolts and other items to be cast-in-place shall be installed as called for on the plans. Falsework, chairs, or supportive devices to be permanently incorporated in the concrete shall be of the same material and shall be considered as reinforcement. All such falsework, chairs, and supportive devices shall be approved by the Engineer prior to installation. No supportive devices shall protrude from the finished surface of the concrete unless approved by the Engineer.

The structure shall be finished in accordance with the specification for CAST-IN-PLACE REINFORCED CONCRETE and once completed, slide gates, stoplogs, grating or railing as specified in the plans shall be installed.

Any culvert or inlet/outlet pipe to be used in conjunction with a pre-cast or cast-in-place concrete control structure shall be installed according to the specification for CULVERT AND PIPE INSTALLATION.

That portion of the culvert, which is to be embedded in the concrete, shall have a 1/2" thick butyl or mastic gasket between the culvert and concrete. The gasket shall meet the requirements of ASTM D1056 for "RE" closed all grades while the mastic shall meet AASHTO M190 Type "A" specification.

301.34 BACKFILL

If, in the opinion of the Engineer, the…