FBO_6 Pace Specs sealed.pdf

DUSRO (03/04/09) 201(1) Pace WRP

201 SPECIFICATION FOR MOBILIZATION

201.1 DESCRIPTION

The work of this section 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 DU or the NRCS Designated Representative.

When work on a project site consists of construction of a number of pipes, or dams/levees, mobilization shall also include the supply of all labor, material and equipment needed to transport required labor, material and equipment between the various pipes or dams/levees sites.

201.2 PUBLIC AND PRIVATE UTILITIES

Utilities are defined to be overhead and underground power or communication lines, and pipelines. All utilities discovered to be in the work area will be identified on drawings or sketches. However, the absence of indicators on the drawings or sketches does not assure the nonexistence of utilities in the work area. The contractor is alerted to conduct his/her own search and discovery for utilities in order to avoid potential damages. The owner/operator shall complete the TXENG80, UTILITIES INVENTORY form prior to construction start or any ground disturbance and return it to DU or a NRCS representative.

201.3 METHOD

The Contractor shall conduct all mobilization and demobilization operations in a timely orderly manner. Unless otherwise approved by DU or the NRCS Designated Representative, mobilization operations shall commence no later than one week after the preconstruction meeting.

Demobilization 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.

201.4 METHOD OF MEASUREMENT

Mobilization shall be measured in the following manner:

No separate measurement will be made for Mobilization.

201.4 METHOD OF PAYMENT

No separate payment shall be made for this item. Payment for “MOBILIZATION” shall be considered incidental to other items.

DUSRO (03/04/09) 202(1) Pace WRP

202 SPECIFICATION FOR SITE PREPARATION

202.1 DESCRIPTION

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

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

coordination of necessary clearing and grubbing operations to allow timely completion of construction staking of a project.

removal disposal by burying of all old fences as designated by DU or the NRCS Designated Representative.

grubbing to remove grass and debris 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.

202.2 MATERIAL

Clearing and grubbing material shall include all trees, tree roots, large stones and boulders, and unsuitable material.

202.3 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 12" 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.

DUSRO (03/04/09) 202(2) Pace WRP

Pipe Removal and salvaging shall consist of all excavations, backfill and depositing of the existing pipes in a location as directed by DU or the NRCS Designated Representative.

Fence removal shall consist of all pulling of posts, dozing and all other mechanical methods utilized to collect the remnants of the old fence and deposit it in a location for burial.

Trees, logs, stumps, brush and other debris shall be burned and buried or disposed of in areas designated by the NRCS Designated Representative All local regulations shall be followed when burning. 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, leveled in such a way as to promote drainage.

202.4 METHOD OF MEASUREMENT

No separate measurement will be made for this item.

202.5 METHOD OF PAYMENT

No separate payment shall be made for this item. Payment for “SITE PREPARATION” shall be included in the payment for Bid Item 204 “Embankment”.

DUSRO (03/04/09) 203(1) Pace WRP

203 SPECIFICATION FOR EXCAVATION

203.1 DESCRIPTION

The work of this section 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 as well as excavation of suitable materials from borrows and excavations. 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. All excavated material shall be deposited at locations shown on the drawings and as directed by DU or the NRCS Designated Representative. No compaction of this material will be required. Maximum deposition heights shall be as shown on the drawings. Deposition areas will be smoothed only to the extent to remove any large clumps, leaving the deposition aesthetically pleasing.

203.2 CONSTRUCTION METHODS

203.21 SITE PREPARATION

Prior to any excavation, sites shall be cleared and grubbed with topsoil removed as specified under "SITE PREPARATION". Material cleared and grubbed shall be disposed of per DU or the NRCS Designated Representative’s directions.

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. 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 overexcavated shall be replaced with suitable materials compacted to a density at least equal to that of the insitu material or to the satisfaction of DU or the NRCS Designated Representative.

Suitable material excavated from the excavation areas shown on the plans shall be spoiled adjacent to the excavated sloughs or canals or may be used in any embankments called for on the plans if approved by the engineer. Placement of embankments or backfills shall be done in accordance with the directions under "EMBANKMENT CONSTRUCTION".

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Excavated material unsuitable for embankments shall be deposited in locations shown on the plans or as directed by DU or the NRCS Designated Representative.

Material placed as spoil shall be a minimum of 10 feet from the top limit of excavation and shall be deposited as uniformly and continuously as possible in successive layers. No specific compaction will be required except for 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 enable the area to be seeded.

203.23 DISPOSAL OF WASTE MATERIALS

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

203.24 CONTROL OF SURFACE AND SUBSURFACE WATER

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

203.3 METHOD OF MEASUREMENT

Excavation construction shall be measured in the following manner:

Cubic Yards – Staked (CYS). Excavation shall be measured on a staked quantity basis for construction of the swales and ponds. This quantity shall be the neat line quantity of excavated ponds and swales superimposed upon the measured surface as determined from the stakeout surveys.

203.4 METHOD OF PAYMENT

Excavation construction shall be paid for at the unit price basis for "EXCAVATION". The unit price bid for excavation construction shall be payment in full for supplying all materials, equipment, labor and any incidental items necessary to perform excavation construction operations as described by this specification.

No separate payment will be made for excavation to install pipes or to obtain borrow. This work shall be considered incidental to the embankment and pipe installation work.

DUSRO (03/04/09) 204(1) Pace WRP

204 SPECIFICATION FOR EMBANKMENT CONSTRUCTION

204.1 DESCRIPTION

The work of this section shall include the supply of all labor, material and equipment required to complete the construction of the pipes and dams/dikes or roadway embankments as shown on the plans and as staked in the field. The work shall include:

construction of levees.

backfilling around pipes and water control structures.

leveling and trimming of embankments and borrow areas.

204.2 CONSTRUCTION METHODS

204.21 FILL MATERIAL

Unless otherwise specified, all material shall be placed in loose lifts of not more than 6" thickness and shall be compacted by routing the hauling and spreading equipment (minimum ground pressure 7.0 psi) over the fill in such a manner that every point on the surface of each layer of fill will be traversed by not less than 1 tread track of the spreading and hauling equipment or by other methods approved by the DU or the NRCS Designated Representative. Moisture content shall be in the range of 1% to +3% of optimum moisture content.

204.22 EMBANKMENT CONSTRUCTION

The Contractor shall not commence embankment construction until such work specified under "SITE PREPARATION" has been completed to the satisfaction of the DU or the NRCS Designated Representative.

Embankment material excavated from ditches/borrows with tractorscraper 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 6" in thickness.

With the approval of DU or the NRCS Designated Representative, the initial layer may be increased in thickness in wet areas to provide a working pad capable of supporting the hauling equipment. Soft areas not capable of supporting the hauling equipment will be excavated and backfilled with suitable fill material.

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The embankment must be maintained in a reasonably level condition at all times. Hauling equipment shall be directed over the full width of each layer to facilitate uniform compaction.

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 six inches in thickness.

All embankments will be construction staked to final grade elevations shown on the drawings by the contractor. Embankments shall be brought to these elevations using embankment material graded to a tolerance of

0.1 ft.

Embankment construction must be as continuous as possible and the fill maintained such that drainage is assured at all time.

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 with the lines, grades and crosssections 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 DU or the NRCS Designated Representative, shall not be used by the Contractor for haulage, access or other purposes without the consent of DU or the NRCS Designated Representative.

204.23 WATERING

During placement and compaction of fill, the moisture content shall be in the range of 1% to +3% of optimum moisture content. Material that is too wet when deposited in the embankment shall either be removed or be dried to the optimum moisture content prior to compaction. No extra payment will be made for hauling or applying water.

204.24 HAUL ROADS AND BORROWS

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.

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Following completion of the work, borrows are to be left in a graded condition acceptable to the NRCS Designated Representative. All haul roads, access roads and temporary crossings are to be removed.

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, plus any allowance for settlement, 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.

204.3 METHOD OF MEASUREMENT

Embankment construction shall be measured in the following manner:

Cubic Yards Staked (CYS): Embankment shall be measured on a staked quantity basis. This quantity shall be the neat line quantity of placed embankment superimposed upon the measured surface as determined from the stakeout surveys and including .3 cut allowed for site preparation quantities.

204.4 METHOD OF PAYMENT

Embankment construction shall be paid for at the unit price basis for "Embankment". The unit price bid for embankment construction shall be payment in full for supplying all materials, equipment, labor and any incidental items necessary to perform embankment construction operations as described by this specification.

DUSRO (03/04/09) 206(1) Pace WRP

206 – SPECIFICATION FOR WATER CONTROL STRUCTURES

206.1 DESCRIPTION

The work of this section shall include the supply of all labor, materials, and equipment required to complete the installation of the culverts and water control structures with appurtenances as called for on the drawings and/or specified herein.

This work shall consist of coupling the structure to the pipe; excavation; bed preparation; installation of culverts, structures, and associated hardware as shown on the plans.

206.2 MATERIALS

206.21 SUPPLY OF MATERIALS

The supply of pipes, risers and all fabrications necessary to complete the job as described on the plans shall be negotiated between the Contractor and the landowner.

206.22 CORRUGATED METAL ALUMINUM PIPE AND RISERS

The sheet thickness of the pipe and risers shall be as specified below:

Pipe 22/3 x 1 3 x 1 or 5 x 1 Diameter Corrugations Corrugations 12"21" 0.064 24"30" 0.079 36"42" 0.109 48"72" 0.138 0.109 72” 0.168 0.138

The risers shall be constructed in accordance with the details shown on the drawings and of the same material as the barrel. The riser shall be continuously welded to the aluminum channel. The barrel shall be continuously welded to the riser.

Corrugated metal pipe and risers shall be fabricated in accordance with ASTM B745 from aluminum sheets conforming to ASTM B744. A metallurgical test report and bill of lading showing respective heat numbers shall be furnished for all pipe delivered to the job. All hardware associated with the riser and pipe shall

DUSRO (03/04/09) 206(2) Pace WRP be made from aluminum and all welding shall be done with aluminum welding rods.

Pipe and risers shall be fabricated with helical corrugations and have continuous lock seams that are welded a minimum of 2" at each end of the pipe section.

Corrugations shall be 22/3 by 1/2"(nominal) corrugations, except pipe 48" in diameter and larger may have 3" x 1" or 5" x 1"(nominal) corrugations.

Aluminum coated steel or aluminized corrugated steel shall not be accepted.

206.23 HANDLING AND STORAGE OF MATERIALS

All materials shall be handled and stored in careful and workmanlike manner to the satisfaction of the Engineer. The contractor shall be responsible for the careful and workmanlike handling, storing, and installation of the materials. The contractor shall be responsible for any damage to the materials and damaged materials will be replaced and/or reinstalled at the contractor’s expense.

206.3 CONSTRUCTION METHODS

206.31 SITE PREPARATION

Site preparation shall be carried out in accordance with Section 202

"SPECIFICATION FOR SITE PREPARATION".

206.32 EMBANKMENT

Embankment shall be carried out in accordance with Section 204

“SPECIFICATION FOR EMBANKMENT”.

206.33 EXCAVATION

Excavation shall be carried out in accordance with Section 203

"SPECIFICATION FOR EXCAVATION".

The Contractor will be required to excavate the base to the lines of excavation and to a depth of the invert elevations as shown on the plans. Base excavation shall extend three feet beyond the ends and sides of the pipe, or pipes, and the excavation shall be transitioned to meet the existing channel slopes. If necessary, the excavation shall be dewatered in order to prevent disturbing the natural soil conditions at the base of the excavation and to allow for the placement and compaction of the backfill material under dry conditions (no standing water at the bottom of the excavation).

Cofferdams will be required for all excavations in active water course channels and in areas of ground water seepage. Cofferdams must be built to withstand all

DUSRO (03/04/09) 206(3) Pace WRP the forces to which they may be subjected and shall be located such as to give sufficient clearance for the construction of cutoff trenches and/or sump pits for dewatering unless otherwise provided.

Cofferdam placement, maintenance and removal shall be the responsibility of the Contractor and shall be considered as incidental to the placement of the culvert.

Dewatering shall be accomplished by constructing cutoff trenches and sump pits around the outside perimeter of the pipe beds. These shall be excavated to a depth of no less than 2 feet below the elevation of the base of the excavation.

Trenches and sump pits shall be shored and braced with cribs as necessary.

The Contractor will be required to provide sufficient pumping capacity to lower and maintain the ground water approximately l foot below the base of excavation.

The excavated base shall be inspected by the Engineer prior to commencement of backfilling. If the Engineer deems further excavation to be required below the bottom of the excavation line shown on the plans and specified herein, the Contractor shall excavate such additional materials as directed by the Engineer.

The work involved in doing this additional excavation will be classified as extra work and will be paid for as such.

The Contractor shall not overexcavate below specified lines and grades. If, in the opinion of the Engineer, the Contractor overexcavates material in an area, he shall replace at his expense the overexcavated material with suitable site material and compact that material to a density equal to the surrounding insitumaterial, or to the satisfaction of the Engineer.

Excavated material not required as backfill shall be classified as "surplus material" and will be dealt with as shown on the plans. Unless otherwise specified, disposal of surplus material shall be considered incidental to Specification 206 "WATER CONTROL STRUCTURES".

206.34 BACKFILL

If, in the opinion of the Engineer, the site excavated material is unsuitable for backfill, the Contractor shall supply, from an assigned borrow area, suitable impervious backfill material. No granular backfill will be allowed unless approved by the Engineer. The payment for supplying this impervious fill shall be considered incidental to the water control structure installation.

If no compaction is specified on the plans or in the specifications the Contractor shall compact the backfill to culvert or embankment compaction requirements whichever is greater.

DUSRO (03/04/09) 206(4) Pace WRP

206.35 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/or culverts necessary to promote drainage 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 Contractors responsibility.

206.36 CONTROL STRUCTURE INSTALLATION

Prior to installation of the control structure, any damage that has occurred to the structure due to transportation and/or handling shall be repaired or replaced to the satisfaction of the Engineer. Welding, drilling, bolting or otherwise attaching devises (temporary or permanent) to the structure to assist in structure installation is prohibited.

206.37 CULVERT INSTALLATION

Any culvert to be used in conjunction with a control structure shall be installed according to Section 207 "SPECIFICATION FOR CULVERT INSTALLATION."

206.4 QUALITY CONTROL

206.41 WORKMANSHIP AND MATERIALS

All workmanship and materials furnished and supplied under this specification are subject to close and systematic inspection and testing by the Engineer including all operations from the selection and production of materials through to final acceptance of the specified work. The Contractor shall be wholly responsible for the control of all operations incidental thereto, notwithstanding any inspection or approval that may have been previously given. The Engineer reserves the right to reject any materials or works which are not in accordance with the requirements of this specification.

206.42 ACCESS

The Engineer shall be afforded full access for the inspection and control testing of materials, both at the site of work and at any plant or borrow pit used for the supply of the materials, to determine whether the materials are being supplied in accordance with this specification.

DUSRO (03/04/09) 206(5) Pace WRP

206.5 METHOD OF MEASUREMENT

Water control structure installation shall be measured on a unit basis. This unit shall be shown in the Unit Price Table of the Standard Bid Form for the "WATER CONTROL STRUCTURES" bid item. Water control structure installation shall be measured in the following manner:

Each (EA): Water control structure installation shall be measured on an individual basis. Measurement shall be made for each structure installed. Price shall include compensation for all incidental items required to install the water control structures in accordance with this specification and the plans.

206.6 METHOD OF PAYMENT

Water control structure installation shall be paid for at the unit price basis bid for "WATER CONTROL STRUCTURES" measured as specified herein. The unit price bid for water control structure shall be payment in full for the supply of all equipment, materials, labor, appurtenances, and any other incidental item needed to install water control structures as described in this specification or shown on the plans.

Payment for this item shall include compensation for; Specification 202 “SITE PREPARATION”; Specification 203 "EXCAVATION”; Specification 204 “EMBANKMENT”; Specification 207 “CULVERT INSTALLATION; and Specification 208 “CONCRETE”.

DUSRO (03/04/09) 207(1) Pace WRP

207 SPECIFICATIONS FOR CULVERT INSTALLATION

207.1 DESCRIPTION

The work of this section shall include the supply of all labor, materials and equipment required to complete the installation of all culverts and/or pipes as called for in the plans or specified herein.

This work shall consist of excavation; cofferdams and dewatering; preparing the bed for the culvert; and installation of culvert sections.

207.2 MATERIALS

The Contractor shall supply all the required aluminum corrugated culvert pipes for the project.

The contractor shall coordinate the delivery of all materials with the vendor and will be responsible for unloading and securing the materials.

207.21 HANDLING AND STORAGE OF MATERIALS

All materials shall be handled and stored in careful and workmanlike manner to the satisfaction of the Engineer. The contractor shall be responsible for the careful and workmanlike handling, storing, and installation of the materials. The contractor shall be responsible for any damage to the materials and damaged materials will be replaced and/or reinstalled at the contractor’s expense.

207.22 ANCHORS

The Contractor shall supply and install ½” diameter by 36” long screwtype anchors as shown on the plans. The pipe shall be secured tightly to the anchors with ¼” stainless steel cables and clamps. All materials used shall be new; and supplied fabricated, and assembled in accordance with the details shown on the drawings.

207.3 CONSTRUCTION METHODS

207.31 EXCAVATION

The Contractor will be required to excavate the base to the lines of excavation and to a depth of the invert elevations as shown on the plans. Base excavation shall extend three feet beyond the ends and sides of the culvert, or culverts, and the excavation shall be transitioned to meet the existing channel slopes. If necessary, the excavation shall be dewatered in order to prevent disturbing the natural soil conditions at the base of the excavation and to allow for the placement and compaction of the backfill material under dry conditions (no standing water at the

DUSRO (03/04/09) 207(2) Pace WRP bottom of the excavation).

Cofferdams will be required for all excavations in active water course channels and in areas of ground water seepage. Cofferdams must be built to withstand all the forces to which they may be subjected and shall be located such as to give sufficient clearance for the construction of cutoff trenches and/or sump pits for dewatering unless otherwise provided.

Cofferdam placement, maintenance and removal shall be the responsibility of the Contractor and shall be considered as incidental to the placement of the culvert.

Dewatering shall be accomplished by constructing cutoff trenches and sump pits around the outside perimeter of the culvert beds. These shall be excavated to a depth of no less than 2 feet below the elevation of the base of the excavation.

Trenches and sump pits shall be shored and braced with cribs as necessary. The Contractor will be required to provide sufficient pumping capacity to lower and maintain the ground water approximately l foot below the base of excavation.

The excavated base shall be inspected by the Engineer prior to commencement of backfilling. If the Engineer deems further excavation to be required below the bottom of the excavation line shown on the plans and specified herein, the Contractor shall excavate such additional materials as directed by the Engineer.

The work involved in doing this additional excavation will be classified as extra work and will be paid for as such.

The Contractor shall not overexcavate below specified lines and grades. If, in the opinion of the Engineer, the Contractor overexcavates material in an area, he shall replace at his expense the overexcavated material with suitable site material and compact that material to a density equal to the surrounding insitumaterial, or to the satisfaction of the Engineer.

Excavated material not required as backfill shall be classified as "surplus material" and will be dealt with as shown on the plans. Unless otherwise specified, disposal of surplus material shall be considered incidental to Specification 207 "PIPE

CULVERT INSTALLATION".

207.32 INSTALLATION AND ASSEMBLY OF CULVERT

The Contractor, after preparation of the bed, shall assemble the culvert sections, progressively in accordance with the plans or manufacturer's instructions.

All culverts supplied to site shall be inspected prior to assembly, for chipping or damage in handling and shall be repaired as directed by the Engineer. Welding, drilling, bolting or otherwise attaching devices (temporary or permanent) to the structure to assist in structure installation is prohibited.

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All materials damaged, distorted by more than 5 percent of nominal dimensions, lost, broken or deemed unsuitable due to the Contractor's method of installation, handling or from neglect shall be replaced by the Contractor at his expense.

207.33 BACKFILL

All materials to be used for bed preparation and backfill will be suitable site material as approved by the Engineer. In the event that no suitable site material is available from designated borrow areas for the culvert installation, the Contractor shall supply suitable material from an approved borrow area. The payment for placing this fill will be classified as extra work and will be paid for as such.

Material used for backfill from designated borrow areas will be paid for as specified in Specification 204 "EMBANKMENT CONSTRUCTION".

The Contractor shall compact the insitumaterial below the invert elevations prior to assembly and erection of the culvert. 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 barrel of the culvert shall be uniformly and evenly supported throughout its entire length.

Initial backfill shall be deposited in horizontal, uniform layers not exceeding 4 inches in thickness and shall extend onehalf (1/2) of the culvert diameter above the crown of the culvert and one (1) culvert diameter beyond both sides of the culvert.

The initial backfill shall be compacted by hand or by hand operated motor driven tamping equipment so as not to produce horizontal or vertical earth pressures which may cause excessive displacement or damage the culvert. The initial backfill shall be compacted to ensure thorough contact with the culvert and achieve a density at or greater than the density of the insitu material. The remaining backfill in the culvert trench located outside of this initial backfill zone shall be placed and compacted in accordance with Section 204 “SPECIFICATION FOR EMBANKMENT CONSTRUCTION”. Each layer will be inspected and approved by the Engineer prior to proceeding with the next layer of backfill.

No boulders, rock, ice, snow, organic material or debris shall be permitted in the trench. This material will be classified as unsuitable material and treated as such.

Compaction equipment or methods that produce horizontal or vertical earth pressures which may cause excessive displacements or which may damage the installation shall not be used.

Backfill shall be executed to the lines and grades shown on the plans and as specified herein.

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207.34 WATER CONTROL STRUCTURE INSTALLATION

The water control structures shall be installed in the manner described in Section

206 "SPECIFICATION FOR WATER CONTROL STRUCTURE".

207.4 QUALITY CONTROL

207.41 WORKMANSHIP AND MATERIALS

All workmanship and materials furnished and supplied under this specification are subject to close and systematic inspection and testing by the Engineer including all operations from the selection and production of materials to final acceptance of the specified work.

The Contractor shall be wholly responsible for the control of all operations incidental thereto notwithstanding any inspection or approval that may have been previously given. The Engineer reserves the right to reject any materials or works which are not in accordance with the requirements of this specification.

207.42 ACCESS

The Engineer shall be afforded full access for the inspection and control testing of materials, both at the site of work and at any plant or borrow pit used for the supply of the materials, to determine whether the materials are being supplied in accordance with this specification.

207.5 METHOD OF MEASUREMENT

No separate measurement will be made for culvert installation. The culvert installation shall be considered an incidental item to the construction

SPECIFICATION 206 WATER CONTROL STRUCTURES.

No separate measurement shall be made for cofferdams (installation and removal), dewatering, backfill, compaction, assembly and installation of culvert. This work shall be considered incidental to the construction SPECIFICATION 206 WATER

CONTROL STRUCTURES.

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207.6 METHOD OF PAYMENT

No separate payment shall be made for items described in this specification.

Compensation will be included in payment for Bid Item 206 Water Control Structures.

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208 SPECIFICATION FOR CONCRETE

208.1 SCOPE

The work to be performed under this specification shall include the furnishing of all superintendence, overhead, labor, materials, equipment, tools, supplies and all things necessary for and incidental to the satisfactory performance and completion of all work as hereinafter specified.

The work includes, but is not necessarily limited to, the following:

Supply, erection and removal of all formwork.

Supply and placement of reinforcement.

Supply, placing and curing of concrete.

Finishing of all concrete surfaces as specified.

All excavation and backfill associated with concrete structures shall be executed as designated by the construction specification 206

WATER CONTROL STRUCTURES.

208.2 MATERIALS

208.21 CEMENT

The cement shall be:

Portland Cement ANSI/ASTM C150, Type I unless otherwise specified by or acceptable to the Engineer.

208.22 ADMIXTURES

Use of calcium chloride shall not be allowed.

Use admixtures shall only be allowed when approved by the Engineer.

Approval will only be given when it is shown that the specified admixture will not effect the integrity of the concrete. Approved use of an admixture still requires concrete to meet specified slump and strength requirements.

208.23 WATER

Mixing water for concrete shall be fresh, clean and potable.

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208.24 AGGREGATES

Aggregates shall be free from dirt and organic material and contain no more than 2 percent by weight of silt and clay particles. All aggregates shall be uniformly graded with a maximum size of 3/4 inch with fine sand content of between 3542 percent. Aggregate will be inspected and approved by the Engineer prior to use.

208.25 REINFORCING STEEL

Reinforcing steel, except as otherwise specified, shall be deformed bars rolled from new billet stock, and shall conform to the latest requirements of the "Standard Specifications for Deformed BilletSteel Bars for Concrete Reinforcement", ASTM A615, Grade 60. Sizes, details and locations of bars shall be as shown on the drawings and as may be specified herein.

All reinforcing steel shall be free of all dirt, scale, oil, grease, and other coating that may reduce bonding to concrete. The required reinforcing shall be of the size and grade specified on the plans.

208.26 STORAGE AND HANDLING OF MATERIALS

Cement shall be stored off the ground in a dry location at all times.

Aggregates shall be stored separately in a manner that will prevent segregating, mixing, and intrusions of foreign materials.

Reinforcement shall be stored on skids or racks off the ground.

208.3 CONSTRUCTION METHODS

208.31 WORKMANSHIP

Work shall be supervised by a competent foreman at all times and shall be performed by skilled and experienced workmen.

208.32 MIX REQUIREMENTS

All concrete shall be either site mix or readymix to achieve a 3,000 psi 28 day compressive strength and a 1 to 4 inch slump.

DUSRO (03/04/09) 208(3) Pace WRP

For the installation of corrugated aluminum risers as described in construction specification 206 – WATER CONTROL STRUCTURES, the concrete used to pour the base shall have the following design mix:

PER CUBIC YARD DESIGN MIX

6 bags cement (Portland Cement ANSI/ASTM C150, Type I) 36 gallons water (adjust for moisture in aggregate) 2873 pounds of aggregates (38% fine sand)

Unless otherwise noted the Contractor shall submit a concrete mix design to the Engineer for all other concrete used in construction prior to the pouring of that concrete. Acceptance of this design by the Engineer does not relieve the Contractor's responsibility to meet above strength, slump or air requirements.

208.33 MIXING AND PLACING

The Contractor shall notify the Engineer 48 hours in advance of any concrete pour. This advance notice will allow the Engineer to schedule the concrete testing and inspection services. No concrete shall be poured without notification or approval of the Engineer.

Concrete shall be mixed only in quantities required for immediate use.

Mixing procedures shall be approved by the Engineer prior to commencement. Water may be added on site by the Contractor as needed as long as slump and air requirements are met. Failure to adhere to these requirements may result in rejection of that batch. The minimum mixing time for all site batch mixes shall be 1 minute and 75 revolutions for all mixes delivered by transit mixers. No concrete shall be placed in forms after mixing longer than 11/2 hours.

The concrete temperature shall be maintained at between 50oF to 90oF during all phases of mixing and placement. When weather conditions will affect the concrete temperature it shall be kept within the stated range by methods approved by the Engineer.

Cold weather concreting procedures shall include but will not necessarily be limited to; preheating of forms and subgrade prior to pouring, heating of poured concrete for a minimum of 5 days and adequate covering of poured concrete during curing. Preheating of forms and subgrade as well as poured concrete shall be done in a manner to maintain temperatures between 50oF and 90oF. All procedures shall be outlined to the Engineer for approval prior to any concrete pour.

DUSRO (03/04/09) 208(4) Pace WRP

Hot weather concreting procedures shall include but will not necessarily be limited to; temperature control of concrete materials, wetting of subgrade, forms, and reinforcement prior to concrete placement and moist curing of poured concrete. All procedures shall be outlined to the Engineer for approval prior to any concrete pour.

Formwork, falsework, and reinforcing shall be inspected and approved by the Engineer prior to concrete placement. Earth surfaces shall be firm, moist, contain no frost or ice, and be free of debris. All formwork shall be oiled or moistened prior to concrete placement.

All reinforcement shall be accurately placed to the dimensions shown on the drawings and shall be secured in place by bar supports, spacers, chairs, wiring and nails. No welding of reinforcement shall be allowed.

Bars shall be located so as to have the thickness of concrete covering shown on the drawings.

Where not otherwise shown or specified, bars in tension shall be lapped 36 diameters and bars in compression 24 diameters, but not less than 12 inches in either case.

Bar supports and spacers shall be of steel and of suitable design and strength to hold the reinforcement accurately in place before and during the placing of concrete.

Footing reinforcement shall be supported on hychairs set on concrete blocks whose top surface is flush with the subgrade, or hung from supports above the forms with sufficient steel hangers. Steel in slabs on the ground shall be supported on hychairs to ensure its proper position in the slab. Hychairs shall be set on concrete bricks or concrete blocks whose top surface is flush with the subgrade surface.

Shop drawings and reinforcing bar shop lists shall be submitted for approval by the Engineer prior to any pour.

Concrete shall be placed by hand, buggy, trough or suitable placement method. Concrete shall not be allowed to freefall more than five feet.

Concrete shall be handworked or mechanically vibrated to achieve a dense, homogenous, structure free of cold joints and honeycombing. If cold joints are necessary in pouring a structure the Contractor shall install waterstops at all such joints. All exposed edges shall be chamfered as shown on the plans. All exposed concrete not in forms shall be sealed or closed by giving these areas a float finish prior to the final broom finish.

Formwork shall not be removed until the concrete has hardened adequately to prevent surface damage and support applied loads. Forms

DUSRO (03/04/09) 208(5) Pace WRP shall remain on poured structures a minimum of 3 days unless otherwise directed by the Engineer. For cold weather concrete pours, forms shall remain on poured structures for a minimum of 5 days.

208.34 FINISHING

All minor surface defects, small honeycomb areas, or broken edges shall be repaired using a drypack mortar consisting of 1 part cement and 21/2 parts of fine sand. Exposed steel forming ties shall be removed to a depth of l inch below the planned concrete surface and the surface defect repaired with a dry pack mortar. All repair shall be done in an efficient and timely manner after formwork is removed.

When repair work to the structure has been completed then a finish coat shall be applied to exposed surfaces. Two coats of Tammstech Concrete Finisher or an approved equal shall be used for a finish coat. This work shall follow the completion of all repair work in an efficient and timely manner.

Concrete shall be cured by means of waterproof paper, polyethylene or placement compound. Curing treatment shall be applied after concrete surfaces are finished.

208.35 TESTING

Unless otherwise specified, the Engineer will perform concrete testing during the course of the work to determine if specifications have been met.

Testing shall include slump and air measurements and cylinders shall be made for strength tests. Failure to meet specified requirements will mean rejection of that batch. Cylinders shall be taken randomly during a pour and broken at 7 and 28 days to determine strengths. Failure of a cylinder to achieve the specified strength for any pour shall require removal of the concrete unless the Contractor can show (at his/her own expense) that the poured concrete meets specifications.

208.4 METHOD OF MEASUREMENT

No separate measurement will be made for reinforced concrete poured as a base for the corrugated aluminum structures or antiflotation. The concrete shall be considered an incidental item to the construction

SPECIFICATION 206 WATER CONTROL STRUCTURES.

DUSRO (03/04/09) 208(6) Pace WRP

208.5 METHOD OF PAYMENT

No separate payment shall be made for items described in this specification. Compensation will be included in payment for Bid Item 206 Water Control Structures.