Attachment D - Final Specifications Combined ARA9.pdf

SPECIFICATIONS

AND

TECHNICAL DOCUMENTS

FOR

THOMAS MITCHELL STREAM RESTORATION

PROJECT – ARA 9

THOMAS MITCHELL PARK

POLK COUNTY, IOWA

POLK COUNTY PUBLIC WORKS

PREPARED BY:

Houston Engineering 100 Court Avenue Suite 202 Des Moines, IA 50309 Phone: 515.444.5393 www.houstonengineering.com

12/31/2025

ALL SECTIONS

I HEREBY CERTIFY THAT THIS ENGINEERING

DOCUMENT WAS PREPARED BY ME OR UNDER MY

DIRECT PERSONAL SUPERVISION AND THAT I AM A

DULY LICENSED PROFESSIONAL ENGINEER UNDER

THE LAWS OF THE STATE OF IOWA.

CHARLES IKENBERRY DATE

LICENSE NO: 22051

MY LICENSE RENEWAL DATE IS:

PAGES OR SHEETS COVERED BY THIS SEAL:

05/13/2025

I HEREBY CERTIFY THAT THIS ENGINEERING

DOCUMENT WAS PREPARED BY ME OR UNDER MY

DIRECT PERSONAL SUPERVISION AND THAT I AM A

DULY LICENSED PROFESSIONAL ENGINEER UNDER

THE LAWS OF THE STATE OF IOWA.

TED RUD DATE

LICENSE NO: 29069

MY LICENSE RENEWAL DATE IS:

PAGES OR SHEETS COVERED BY THIS SEAL:

TED

RUD

29069

ALL SECTIONS

12/31/2025

05/13/2025 http://www.houstonengineering.com/

MEASUREMENT AND BASIS OF PAYMENT 01250-1

SECTION 01250

MEASUREMENT AND BASIS OF PAYMENT

PART 1 - GENERAL

1.01 RELATED DOCUMENTS:

A. Drawings and General Provisions of the contract, including the General Covenants and Provisions, Supplementary Covenants and Provisions and General Requirements.

1.02 LUMP SUM / UNIT PRICE BID:

A. Bid each item on a Unit Price basis or Lump Sum basis as required, including furnishing all labor, equipment and materials necessary to complete all the work indicated in the Contract Documents.

1.03 QUANTITIES:

A. Various estimated quantities are furnished within the Contract Documents to assist the Contractor in reviewing the Project prior to bidding. The estimated quantities are not intended to be used by the Contractor as sole basis for determining the scope and volume of the work. The Contractor is responsible for verifying all quantities necessary to submit bids for the construction of a proper and complete project.

1.04 MEASUREMENT:

A. The contractor is responsible for constructing the project to the final lines and grades shown. Owner will measure construction units only to ensure that at least minimum quantities have been properly installed.

1.05 SCOPE:

A. Each item in the Bidder's Proposal Schedule of Prices will be paid at the unit or lump sum price. The price for each item shall be considered full compensation for furnishing superintendence, overhead, bonds, insurance, mobilization, testing and profit necessary to complete the construction of the item of the project listed in the

Bidder's Proposal.

B. It is not the intent of the Bidder's Proposal to itemize each, and every item and system required. Items required for project completion and not specifically mentioned in Bidder's Proposal shall be included with items which they would be considered subsidiary.

1.06 ESTIMATED QUANTITIES:

A. The items and quantities described above, as well as others listed throughout the Contract Documents, are provided for the bidder's review and consideration. The quantities listed herein are not guaranteed by the owner or the Project Engineer to be totally accurate nor to include all items of work. They are provided for the bidder's convenience to assist in the preparation of the bid. The bidder is responsible for preparing his own quantity takeoff and bid preparation.

1.07 MEASUREMENT AND PAYMENT – BID ITEM DESCRIPTIONS:

GENERAL

A. Mobilization shall include all bonds, permits, insurance, administrations, transportation to and from the site, operating supplies, establishing and maintaining access routes, detailed construction layouts, meetings, and coordination necessary to provide, manage, and maintain a construction force at the project site complete and ready to perform all work required under the contract. Protection methods to avoid damage to existing infrastructure (pipes, utilities, buildings, fences, etc) are included in this item. Documentation of pre-construction conditions also included. Clean-up to the construction site(s), restoring site(s) to original condition and de-mobilization of construction forces upon approval of the completed project are included in this item.

Repairing roads or driveways to original conditions are not to be included in this line item. The pay item is a lump sum. Payment for Mobilization will be per IDOT Section 2533 as follows:

a. Partial Payments

MEASUREMENT AND BASIS OF PAYMENT 01250-2

A. Partial payment of mobilization will be made for each project within 30 calendar days after receipt of a signed contract. This partial payment will be either 10% of the contract price for this item or 1% of the original project sum, whichever is less. If the partial payment for a project is less than $1000, the Engineer will delay this partial payment until 5% of the awarded project total is earned.

B. When 5% of the original project sum is earned, either 25% of the contract price for this item or

2.5% of the original project sum, whichever is less, will be paid.

C. When 10% of the original project sum is earned, either 50% of the contract price for this item or

5% of the original project sum, whichever is less, will be paid.

D. When 25% of the original project sum is earned, either 100% of the contract price for this item or 10% of the original project sum, whichever is less, will be paid.

b. Full Payment

A. Upon completion of all work on the project required by the contract, full payment will be made for this contract item, including any amount not paid as a partial payment.

B. Clearing and Grubbing shall include all materials, disposal, and incidental items necessary to complete the clearing and grubbing of trees, shrubs, other vegetation, fencing, debris, and trash or rubbish required to access and complete the construction. This includes the access routes and borrow areas. The pay item is one acre, computed to the nearest one-tenth acre from measured dimensions of areas within the limits of construction.

C. Survey and Staking shall include all preparation, installation, record keeping, management/maintenance of temporary benchmarks, using GPS files and equipment, any surveying, and any staking the Contractor requires for proper construction. Payment for Survey and Staking will be per SUDAS Section 11,010. The pay item is a lump sum.

D. Water Handling shall include all materials, equipment and manual labor required to handle surface water, groundwater that may seep into work areas, and runoff that occurs during construction. It is intended that the contractor handle water sufficient to create working conditions to perform required construction activities. This line items includes any incidental items to handle water during construction of project features as directed in the construction plans. Contractor will be required to submit a Water Handling Plan for approval prior to commencing with work. The pay item is one lump sum.

E. SWPPP Development and Management shall include applying for and obtaining the National Pollutant Discharge

Elimination System (NPDES) permit through Iowa Department of Natural Resources and all preparation, installation, record keeping, management/maintenance for regulatory compliance, excavation, dewatering, backfill, materials, supplemental BMPs, and incidental items necessary to construct and maintain sediment and erosion control during the construction period in compliance with NPDES regulations and to remove and dispose of non-permanent sediment control practices after vegetation is established. Seeding and Erosion Control

Products are not to be included in this line item, individual line items have been provided as needed below. The pay item is a lump sum. Payment for items in the Quantities and SWPPP Sheets in the Contract Documents are not to be included in this item. Additional SWPPP practices, as directed by the SWPPP Provider, are to be included.

F. Straw Wattle shall include all labor and materials, subgrade preparation, handling of water, accessories, and related work necessary to install the straw wattle as planned and per Statewide Urban Design and Specifications

(SUDAS), 2025 sections 9040.105. The pay item is one linear foot, measured in place as planned.

G. Construction Exit shall include all labor and materials, excavation, dewatering, subgrade preparation, hauling, placement, and incidental items necessary to complete the construction exit construction. Work under this item shall refer to the SUDAS, 2025 sections 9040.120. The pay item is one each, in place as planned.

H. Flotation Silt Curtain shall include all labor and materials, subgrade preparation, handling of water, accessories, and related work necessary to install flotation silt curtain as planned. The pay item is one linear foot, measured in place as planned.

I. Hydraulic Seeding and BFM Mulching – Turf Grass Seed Mix shall include all labor, materials, subgrade preparation, handling of water, and related work necessary to seed, mulch, establish and maintain planned vegetation areas as required under the contract. The pay item is one acre, placed as planned, of the type(s) listed in the specification, computed to the nearest one-tenth acre from measured dimensions of site access and

J. Hydraulic Seeding and BFM Mulching – Riparian Seed Mix shall include all labor, materials, subgrade preparation, handling of water, and related work necessary to seed, mulch, establish and maintain planned

MEASUREMENT AND BASIS OF PAYMENT 01250-3

vegetation areas as required under the contract. This item is for labor only, riparian seed mix will be provided by the Client. The pay item is one acre, as planned, of the type(s) listed in the specification, computed to the nearest one-tenth acre from measured dimensions of seeded areas within the limits of construction.

K. Hydraulic Seeding and BFM Mulching – Mesic Prairie Seed Mix shall include all labor, materials, subgrade preparation, handling of water, and related work necessary to seed, mulch, establish and maintain planned vegetation areas as required under the contract. This item is for labor only, seed mixes will be provided by the

Client. The pay item is one acre, as planned, of the type(s) listed in the specification, computed to the nearest one-tenth acre from measured dimensions of seeded areas within the limits of construction.

L. Hydraulic Seeding and BFM Mulching – Temporary Seed Mix shall include all labor, materials, subgrade preparation, handling of water, and related work necessary to seed, mulch, establish and maintain temporary vegetation areas, when necessary and as approved by the field engineer. The pay item is one acre of the type(s) listed in the specification, computed to the nearest one-tenth acre from measured dimensions of seeded areas within the limits of construction.

M. Class “E” Riprap for Drainage Reinforcement shall include the materials, excavation, dewatering, subgrade preparation, hauling, placement, and incidental items necessary to complete rock riprap construction per the construction documents. The pay item is one ton, as delivered (with delivery tickets collected and documented by contractor) and measured in place as planned.

N. Temporary Stream Crossing shall include all labor and materials, excavation, dewatering, subgrade preparation, hauling, placement, and incidental items necessary to complete the temporary stream crossing. Work under this item shall refer to the Iowa DOT specification EW-401. The pay item is one each, in place as planned.

O. Traffic Control shall include providing temporary traffic control devices that are furnished, erected, maintained, and removed to provide traffic control as described in the construction documents. The quantity of traffic control devices and signage required shall include, but not be limited to, the type and amount of devices shown on the traffic control plan in the Contract Documents, and additional traffic control devices as directed by the

Engineer. The pay item is one lump sum for all work included in this bid package, individual traffic control devices will not be measured separately.

P. Vehicle Removal and Disposal shall include materials, handling of water, excavation, disposal, and related work necessary to remove the existing vehicles as described in the construction documents and off-site disposal. The pay item is one each one for work included in the removal.

Rock Riffles

Q. Rounded Class “E” Riprap shall include the materials, excavation, dewatering, subgrade preparation, hauling, placement, and incidental items necessary to complete rock riprap construction per the construction documents. The pay item is one ton, as delivered (with delivery tickets collected and documented by contractor) and measured in place as planned.

Toe Rock

R. Excavation shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the removal of soil identified for excavation according to the construction documents. Hauling, handling, and dewatering of all excavated materials and placing to the required grades and elevations according to construction documents is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

S. Dispose Excess Material Off-Site shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the hauling of soil identified for excavation according to the construction documents.

Hauling, spoiling, handling, and dewatering of all excavated materials off-site is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

T. Class “E” Rock Riprap shall include the materials, dewatering, subgrade preparation, hauling, placement, and incidental items necessary to complete rock riprap construction per the construction documents. The pay item is one ton, as delivered (with delivery tickets collected and documented by contractor) and measured in place as planned.

U. Geotextile Fabric shall include all materials, subgrade preparation, handling of water, and related work necessary to place geotextile filter fabric. The pay item is one square yard, measured in place as planned.

MEASUREMENT AND BASIS OF PAYMENT 01250-4

V. Strip, Stockpile, and Replace 6” Topsoil shall include all items necessary to remove six (6) inches of topsoil from the locations shown for excavation on the construction documents, stockpiling the material and then replacing the topsoil in the same locations. This shall include all labor, materials, dewatering, excavation, stockpiling, spreading and finish-grading topsoil in the areas detailed in the construction documents. The pay item is one cubic yard in place on completed work areas, measured as planned.

W. Rolled Erosion Control Product (RECP), Type 4.B all include all materials, subgrade preparation, handling of water, and related work necessary to place erosion control matting in accordance with SUDAS, 2025 sections, 9040. The pay item is one square yard, measured in place as planned.

Bank Shaping

X. Excavation shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the removal of soil identified for excavation according to the construction documents. Hauling, handling, and dewatering of all excavated materials and placing to the required grades and elevations according to construction documents is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

Y. Dispose Excess Material Off-Site shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the hauling of soil identified for excavation according to the construction documents.

Hauling, spoiling, handling, and dewatering of all excavated materials off-site is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

Z. Strip, Stockpile, and Replace 6” Topsoil shall include all items necessary to remove six (6) inches of topsoil from the locations shown for excavation on the construction documents, stockpiling the material and then replacing the topsoil in the same locations. This shall include all labor, materials, dewatering, excavation, stockpiling, spreading and finish-grading topsoil in the areas detailed in the construction documents. The pay item is one cubic yard in place on completed work areas, measured as planned.

AA. Rolled Erosion Control Product (RECP), Type 4.B all include all materials, subgrade preparation, handling of water, and related work necessary to place erosion control matting in accordance with SUDAS, 2025 sections, Floodplain Benching

BB. Excavation shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the removal of soil identified for excavation according to the construction documents. Hauling, handling, and dewatering of all excavated materials and placing to the required grades and elevations according to construction documents is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

CC. Dispose Excess Material Off-Site shall include all cost for materials, disposal, dewatering, and incidental items necessary to complete the hauling of soil identified for excavation according to the construction documents.

Hauling, spoiling, handling, and dewatering of all excavated materials off-site is subsidiary to this pay item. The pay item is one cubic yard as measured at the location of removal that the required elevations and grades were achieved.

DD. Strip, Stockpile, and Replace 6” Topsoil shall include all items necessary to remove six (6) inches of topsoil from the locations shown for excavation on the construction documents, stockpiling the material and then replacing the topsoil in the same locations. This shall include all labor, materials, dewatering, excavation, stockpiling, spreading and finish-grading topsoil in the areas detailed in the construction documents. The pay item is one cubic yard in place on completed work areas, measured as planned.

EE. Rolled Erosion Control Product (RECP), Type 4.B all include all materials, subgrade preparation, handling of water, and related work necessary to place erosion control matting in accordance with SUDAS, 2025 sections, Toe Wood

FF. Toe Wood shall include all excavation, dewatering, preparation, backfill, material, and incidental items necessary to install the root wads according to the construction documents. The pay item is linear foot as placed.

MEASUREMENT AND BASIS OF PAYMENT 01250-5

GG. Fabric Encapsulated Soil Lifts shall include all labor, materials, excavation, subgrade preparation, backfill, and equipment necessary to construct the fabric encapsulated soil lifts as shown in the construction documents. The pay item is linear foot as placed.

Step Pool

HH. Cut Weir Stone shall include all materials, dewatering, subgrade preparation, compaction, hauling, placement and incidental items necessary to install the weir stone aggregate for the vegetation barrier base according to the construction documents. The pay item is one ton, as delivered (with delivery tickets collected and documented by contractor) and measured in place as planned.

II. Geotextile Fabric shall include all materials, subgrade preparation, handling of water, and related work necessary to place geotextile filter fabric. The pay item is one square yard, measured in place as planned.

Cross-Vane

JJ. Cut Weir Stone shall include all materials, dewatering, subgrade preparation, excavation, compaction, hauling, placement and incidental items necessary to install the cut weir stone for the cross-vane according to the construction documents. The pay item is one ton, as delivered (with delivery tickets collected and documented by contractor) and measured in place as planned.

KK. Geotextile Fabric shall include all materials, subgrade preparation, handling of water, and related work necessary to place geotextile filter fabric. The pay item is one square yard, measured in place as planned.

END OF SECTION

SUBMITTALS 01300-1

SECTION 01300

SUBMITTALS

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Submittal procedures.

B. Construction progress schedules.

C. Proposed products list.

D. Product data.

E. Shop drawings.

F. Samples.

G. Manufacturer’s installation instructions.

H. Manufacturers certificates.

1.2 RELATED SECTIONS

A. All sections.

1.3 SUMMITTAL PROCEDURES

A. Transmit each submittal with a transmittal letter or form listing items submitted.

B. Sequentially number the transmittal form. Revise submittal with original number and a sequential alphabetic suffix.

C. Identify Project, Contractor, Subcontractor or supplier; pertinent drawing and detail number, and specification section number, as appropriate.

D. Apply Contractor’s stamp or statement, signed or initialed certifying Contractor has reviewed the submittal and verified Products required, field dimensions, adjacent construction Work, and coordination of information, is in accordance with the requirements of the Work and Contract Documents.

E. Schedule submittals to expedite the Project and deliver to Engineer’s office. Coordinate submission of related items.

F. For each submittal for review, allow 15 days excluding delivery time to and from the contractor.

SUBMITTALS 01300-2

G. Identify variations from Contract Documents and Product or system limitations which may be detrimental to successful performance of the completed Work.

H. Revise and resubmit as required, identify all changes made since previous submission.

I. Submittals not requested will not be recognized or processed.

1.4 CONSTRUCTION PROGRESS SCHEDULES

A. Submit initial schedule along with Bid.

B. Submit schedule revisions with each Application for Payment, identifying changes since previous version.

1.5 PROPOSED PRODUCTS LIST

A. Within 20 days after date of Notice to Proceed, submit list of major products proposed for use, with name of manufacturer, trade name, and model number of each product.

B. For products specified only by reference standards, give manufacturer, trade name, model or catalog designation, and reference stands.

1.6 PRODUCT DATA

A. Submit the number of copies which the Contractor wants returned, plus three copies which will be retained by the Engineer and Owner.

B. Mark each copy to identify applicable products, models, options, and other data. Supplement manufactures’ standard data to provide information unique to this Project.

1.7 SHOP DRAWINGS

A. If multiple hard copies are requested to be returned to the Contractor, submit the number of opaque reproductions which Contractor requires returned, plus three copies which will be retained by Engineer and Owner.

B. If a single, scanned electronic copy of the processed drawing is acceptable to the Contractor, a single electronic copy may be submitted to the Engineer for approval.

1.8 SAMPLES

A. If requested submit samples of the following items:

1. Geotextile materials.

2. Aggregate materials.

SUBMITTALS 01300-3

3. Concrete materials.

4. Pipe Products

1.9 MANUFACTURER INSTALLATION INSTRUCTIONS

A. When specified in individual specification sections, submit certification by manufacturer to Engineer, in quantities specified for Product Data.

B. Indicate special procedures, perimeter conditions requiring special attention, and special environmental criteria required for application or installation.

1.10 MANUFACTURER CERTIFICATES

A. When specified in individual specification sections, submit certification by manufacturer to Engineer, in quantities specified for Product Data.

B. Indicate materials or Product conforms to or exceeds specified requirements. Submit supporting reference data, affidavits, and certifications as appropriate.

C. Certificates may be based on recent or previous test results on material or Product, if acceptable to Engineer.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

QUALITY CONTROL 01400-1

SECTION 01400

QUALITY CONTROL

A. Quality assurance – control of installation.

B. Tolerances.

C. References.

D. Testing.

E. Manufacturer field services and reports.

1.2 RELATED SECTIONS

A. All sections.

1.3 QUALITY ASSURANCE – CONTROL OF INSTALLATION

A. Monitor quality control over suppliers, manufacturers, products, services, site conditions, and workmanship, to produce Work of specified quality.

B. Comply with manufacturers’ instructions, including each step of sequence.

C. Should manufacturers’ instruction conflict with Contract Documents, request clarification from Resident Project Representative before proceeding.

D. Comply with specified standards as minimum quality for the Work except where more stringent tolerances, codes, or specified requirements indicate higher standards or more precise workmanship.

E. Perform work by persons qualified to produce workmanship of specified quality.

F. Secure Products in place with positive anchorage devices designed and sized to withstand stresses, vibration, physical distortion, or disfigurement.

1.4 TOLERANCES

A. Monitor tolerance control of installed Products to produce acceptable Work. Do not permit tolerances to accumulate.

QUALITY CONTROL 01400-2

B. Comply with manufacturers’ tolerances. Should manufacturers’ tolerances conflict with Contract Documents, request clarification from Resident Project Representative before proceeding.

C. Adjust Products to appropriate dimensions; position before securing Products in place.

1.5 REFERENCES

A. For Products or workmanship specified by association, trade, or other consensus standards, comply with requirements of the standard except when more rigid requirements are specified or are required by applicable codes.

B. Conform to reference standard by date of issue current on date of Contract Documents, except where a specific date is established by code.

C. Obtain copies of standards where required by product specification sections.

The contractual relationship, duties, and responsibilities of the parties in Contract as well as those of the Engineer shall not be altered from the Contract Documents by mention or inference otherwise in any reference documents.

1.6 TESTING

A. Testing performed as part of the testing allocation allowance includes testing required by the following specification sections:

Section 03300 – Cast-in-Place Concrete

B. Unless otherwise specified, perform and pay for all other test and instrument installation required for the Project.

C. Submit reports of required tests to Engineer indicating observations and results of tests and indicating compliance or non-compliance with Contract Documents.

D. Cooperate with Engineer or independent firm performing any tests not required to be performed by Contractor. Furnish samples of materials, design mixes, equipment, tools, storage, safe access, and assistance by incidental labor as requested

E. Testing does not relieve Contractor from performing Work to contract requirements.

1.7 MANUFACTURER FIELD SERVICES AND REPORTS

A. When specified in individual specification sections, require material or Product suppliers or manufacturers to provide qualified staff personnel to observe site conditions, conditions of surfaces and installation, quality of workmanship, and to initiate instructions when necessary.

QUALITY CONTROL 01400-3

B. Report observation and site decisions or instruction given to applicators or installers that are supplemental to or different from manufacturers’ written instructions to the Engineer prior to work.

PART 2 PRODUCTS

Not Used.

PART 3 EXECUTION

Not Used.

SOIL MATERIALS 02205-1

SECTION 02205

SOIL MATERIALS

A. Subsoil materials.

B. Topsoil materials.

1.2 RELATED SECTIONS

A. All sections.

1.3 MEASUREMENT AND PAYMENT

A. Section 01250 – Measurement and Basis of Payment.

1.4 REFERENCES

A. ASTM 0698 - Test Methods for Moisture-Density Relations of Soils and Soil-Aggregate Mixtures, Using 5.5 Ib Rammer and 12 inch Drop.

B. ASTM D1556 - Test Method for Density of Soil in Place by the Sand-Cone Method.

C. ASTM D2167 - Test Method for Density and Unit Weight of Soils in Place by the Rubber Balloon Method.

D. ASTM 02487 - Classification of Soils for Engineering Purposes.

E. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

F. ASTM D3017 - Test Method for Moisture Content of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

PART 2 PRODUCTS

2.1 SUBSOIL MATERIALS

A. Suitable Materials for Embankment Fill: Clay or clayey subsoil, and glacial till subsoil, from project excavations, substantially free of organic material, graded free of vegetative material, gravel or lumps larger than 3 inch size, and debris; conforming to ASTM D2487 group symbol CL or CH; capable of

SOIL MATERIALS 02205-2

being broken down, mixed, compacted and kneaded to form a dense uniform; and relatively impervious earth fill; and must be:

1. At least 51% passing the No. 200 sieve as determined by ASTM D1140

2. Sand content not more than 25% by weight

3. Non-dispersive (crumb test grades 1 and 2) as determined by on-site material testing performed by FIELD EINGGINER:

a. FIELD ENGINEER to perform crumb tests on all borrow materials

b. CONTRACTOR shall allow a minimum of one day notice of borrow locations and provide potholes to allow FIELD ENGINEER time to obtain samples and run required test

c. FIELD ENGINEER to provide direction to CONTRACTOR on acceptable borrow materials

2.2 TOPSOIL MATERIALS

A. Topsoil stockpiled from site stripping and clearing operations, graded free of roots, debris and rocks or lumps larger than 1-1/2 inch size and substantially free of vegetative material.

PART 3 EXECUTION

3.1 SOIL REMOVAL

A. Excavate subsoil and topsoil from areas designated for project grading or construction.

B. Remove lumped soil, vegetative material, boulders, and rock.

C. Stockpile sufficient excavated material and topsoil on-site to construct project fills in accordance with Section 02223 - Backfilling. Waste excess material not being used for project fills off-site.

3.2 STOCKPILING

A. Separate topsoil and subsoil materials to prevent mixing.

B. Prevent contamination of stockpiled material.

C. Direct surface water away from stockpile site to prevent erosion or deterioration of materials.

3.3 STOCKPILE CLEANUP

A. Remove stockpile, leave area in a clean and neat condition. Grade site surface to prevent free standing surface water.

AGGREGATE MATERIALS 02207-1

SECTION 02207

AGGREGATE MATERIALS

A. Aggregate materials other than rock riprap materials.

1.2 RELATED SECTIONS

A. All sections.

1.3 MEASUREMENT AND PAYMENT

A. Section 01250 – Measurement and Basis of Payment

1.4 REFERENCES

A. AASHTO M147 - Materials for Aggregate and Soil Aggregate.

B. ASTM C136 - Method for Sieve Analysis of Fine and Coarse Aggregates.

C. ASTM D698 - Test Methods for Moisture-Density Relations of Sails and Soil-Aggregate Mixtures, Using 5.5 Ib (2.49 Kg) Rammer and 12 inch (304.8 mm) Drop.

D. ASTM D4253 - Maximum Index Density and Unit Weight of Soils using a vibratory table.

E. ASTM D2167 - Test Method for Density and Unit Weight of Soil in Place by the Rubber Balloon Method.

F. ASTM D2487 - Classification of Soils for Engineering Purposes.

G. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

H. ASTM D3017 - Test Method for Moisture Content of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

I. ASTM D4254 - Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density.

J. ASTM D2434 - Test Method for Permeability of Granular Soils (Constant Head).

K. State of Iowa Department of Transportation - Standard Specifications with GS-15009 Revisions.

AGGREGATE MATERIALS 02207-2

L. ASTM C33 - Standard Specifications for Concrete Aggregates.

1.5 SUBMITTALS FOR REVIEW

A. Section 01300 - Submittals: Procedures for submittals.

B. Submit supplier's testing laboratory gradation analysis of proposed aggregate material(s).

C. Submit supplier's testing laboratory density analysis for proposed aggregate material(s).

D. Submit supplier's testing laboratory permeability analyses for proposed drainage system aggregates.

PART 2 PRODUCTS

2.1 AGGREGATE MATERIALS

A. Gravel Subbase: materials for asphalt road and trail replacement shall conform to gradation and material requirements per Iowa DOT Section 4121 (Granular Subbase Material) in accordance with Section 2111 (Granular Subbase).

B. ¾” Crushed Aggregate: Temporary Construction Crossing, as planned in Construction documents, shall consist of crushed aggregate size of ¾” or larger diameter.

2.2 SOURCE QUALITY CONTROL

A. Section 01400 - Quality Control.

B. Provide materials of each type from same source throughout the work unless original source cannot meet requirements.

PART 3 EXECUTION

3.1 STOCKPILING

A. Stockpile materials on site.

B. Stockpile in sufficient quantities to meet Project schedule and requirements.

C. Separate differing materials to prevent mixing.

D. Direct surface water away from stockpile site to prevent erosion or deterioration of materials.

AGGREGATE MATERIALS 02207-3

3.2 STOCKPILE CLEANUP

A. Remove stockpile, leave area in a clean and neat condition. Grade site surface to prevent free standing surface water.

EXCAVATING 02222-1

SECTION 02222

EXCAVATING

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Excavation and salvaging of topsoil.

B. Excavation and preparation of foundation for fills.

C. Excavation of site to planned grade and contour.

D. Disposal of excess material

1.2 RELATED SECTIONS

A. All sections.

1.3 MEASUREMENT AND PAYMENT

A. Section 01250 – Measurement and Basis of Payment

1.4 FIELD MEASUREMENTS

A. Verify that survey benchmarks and existing contours for the work site are as indicated on the drawings.

1.5 DEFINITIONS

A. Maximum Dry Density: As defined by ASTM D698-78.

B. Optimum Moisture Content: Determined by the ASTM standard specified to determine the maximum dry density or relative density. Field moisture content shall be determined on the basis of the fraction passing the 3/4 inch sieve.

C. Relative Density: As defined by ASTM D4253 and D4254.

D. Prepared Ground Surface: The ground surface after clearing, grubbing, stripping, excavation, and scarification and/or compaction.

E. Completed Course: A course or layer that is ready for the next layer or next phase of the work.

F. Well-Graded: A mixture of particle sizes that has no specific concentration or lack of one or more sizes. Well-graded does not define any numerical value that must be placed on the coefficient of uniformity, coefficient of curvature, or other specific grain size distribution parameters. Well-graded

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is used to define a material type that, when compacted, produces a strong and relatively incompressible soil mass free from detrimental voids.

G. Waste: Excess soil from designated excavations, oversize soil or rock particles, excess stripping, borrow that is frozen or borrow that the Contractor chooses not to utilize because it is too wet or dry for immediate placement. Waste does not include trash, debris from clearing and grubbing, or any other garbage.

H. Earth Excavation shall be defined as the excavation of all types of materials that can be excavated, transported, and unloaded (without the absolute necessity of blasting) by use of heavy ripping equipment, wheel tractor-scrapers, and pusher tractors or that can be excavated and dumped into place or loaded onto hauling equipment by means of excavators equipped with attachments (such as shovel, bucket, backhoe, drag line or clam shell) appropriate to the character of the materials and the site conditions.

I. Heavy ripping equipment shall be defined as a rear-mounted, heavy duty, single tooth, ripping attachment mounted on a tractor having a power rating of 200-300 net horsepower (at the flywheel).

J. Wheel tractor-scraper shall be defined as a self-loading (not elevating) and unloading scraper having a struck bowl capacity of 12-20 yards.

K. Pusher tractor shall be defined as a track type tractor having a power rating of 200-300 net horsepower (at the flywheel) equipped with appropriate attachments.

L. Borrow: Material excavated from required excavations, designated borrow areas, or Contractor-selected borrow areas, as approved by the Engineer.

M. Backfill: Materials used to construct embankments, fill excavations and trenches, or to fill around or beneath structures or pipes.

N. Imported Material: Material obtained by the Contractor from sources off the site.

1.6 SHORING, SHEETING, BRACING, AND SLOPING

A. Install and maintain shoring, sheeting, bracing, and sloping necessary to support the sides of the excavation, to keep and to prevent any movement which may damage adjacent pavements, utilities, or structures, damage or delay the work, or endanger life and health. Install and maintain shoring, sheeting, bracing, and sloping as required by OSHA and other applicable governmental regulations and agencies.

1.7 EXCAVATION SAFETY

A. The Contractor shall be solely responsible for making all excavations in a safe manner. Provide appropriate measures to retain excavation side slopes and prevent rock falls to ensure that persons working in or near the excavation are protected.

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1.8 CODES, ORDINANCES, AND STATUTES

A. Contractors shall familiarize themselves with, and comply with, all applicable codes, ordinances, statutes, and bear sole responsibility for the penalties imposed for noncompliance.

1.9 TOLERANCES

A. All excavations to finish grade shall be constructed within a tolerance of 0.1 foot except where dimensions or depths are shown or specified as minimum. All grading shall be performed to maintain slopes and drainage as shown. No unplanned reverse slopes will be permitted.

1.10 SITE INVESTIGATION AND CONDITIONS

A. The submission of a Bid shall be conclusive evidence that the Bidder has investigated the site and is satisfied as to the conditions to be encountered, as to the character, quality, and quantities of work to be performed and materials to be furnished, and as to the requirements of the Contract Documents.

B. The Contractor may make arrangements with the Owner for permission to conduct such additional subsurface investigation as may be necessary to verify existing conditions.

PART 2 PRODUCTS

2.1 MATERIALS

A. Vegetation and debris to be removed from site or wasted in locations approved by Engineer.

B. Stone or rubble to be removed from site.

C. Subsoil and topsoil which may be suitable for backfilling.

D. Subsoil and topsoil which may need to be removed from site or wasted in locations on-site approved by Engineer.

2.2 ON-SITE MATERIALS

A. General: Obtain on-site materials from required excavation for the various facilities. Bidders are cautioned that wide variations in the nature, excavation characteristics, moisture content, and consistency of the on-site materials are to be anticipated. Variations in the level of effort necessary for excavation, obtaining satisfactory moisture content and obtaining an acceptable uniform mixture of fill material is to be expected.

EXCAVATING 02222-4

3.1 PREPARATION

A. Identify required lines, levels, contours, and datum locations.

B. Locate, identify, and protect above and below grade utilities that are to remain from damage.

C. Notify utility companies to remove or relocate utilities where necessary to complete work.

D. Protect plant life, and other landscape features remaining as a portion of final landscaping.

E. Protect benchmarks, survey control points, existing structures, fences, sidewalks, paving, and curbs from excavating equipment and vehicular traffic.

3.2 TOPSOIL SALVAGING

A. Excavate and salvage a minimum of 6” of topsoil from areas to be further excavated, re-landscaped, or re-graded, without mixing with foreign materials.

B. Do not excavate topsoil which is saturated due to wet weather or temporary inundation.

C. Stockpile salvaged topsoil in area(s) on-site to depth(s) not exceeding 8 feet and protect from erosion.

D. Reuse topsoil by spreading over disturbed bed after final grading and prior to seeding.

E. Dispose of excess topsoil, not intended for reuse, off-site or in an area approved by the Engineer.

3.3 EXCAVATION

A. Perform and complete all earth excavation of every description, regardless of the type, nature, or condition of material encountered, as specified, shown, or necessary to accomplish the excavation.

The Contractor shall assume all responsibility for deductions and conclusions as to the nature of the materials to be excavated and the difficulties of making and maintaining the required excavations.

B. The presence of isolated boulders or rippable rock ledges will not in itself be sufficient cause to change the definition or classification of the excavation.

C. Excavate to the lines and grades as shown and as necessary to complete the construction. Allow for forms, working space, riprap, bedding, finish topsoil, etc., as shown or necessary. Do not carry excavation for footings and slabs deeper than the elevation shown. Excavation carried below the grade lines shown or established by the Engineer shall be repaired as specified hereinafter. Correct all over-excavated areas at the Contractor's sole expense.

D. All necessary precautions shall be taken to preserve the material below and beyond the established lines of all excavation in the soundest possible condition. Any damage to the work

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beyond the required excavation lines due to frost damage, wetting, drying, or the Contractor's operations shall be repaired at the Contractor's sole expense.

E. Excavation for embankment, structure foundations, and trenches shall be performed in the dry. No excavation shall be made in frozen materials without written approval.

F. Limits of excavation to safely accomplish the work shall be determined by the Contractor. Any minimum excavation limits shown on the drawings are for the purpose of material identification only and do not necessarily represent safe limits. All excavations shall be free of overhangs, and the sidewalls shall be kept free of loose material. As a minimum, the Contractor shall slope all excavations to prevent these conditions.

G. Accurate trimming of the slopes of the excavations to be filled will not be required, but such excavations shall conform as closely as practicable to the established lines and grades.

H. The method of excavation for structures is optional; however, no equipment shall be operated within 5 feet of newly completed construction. Excavation that cannot be accomplished without endangering the new structures shall be done with hand tools.

I. Contractors method of excavation shall provide for full utilization of excavated material which is suitable for construction. Unsuitable materials shall be segregated by loads during the excavation operations, without contamination of suitable materials, and disposed of in the waste disposal area.

Suitable materials shall be placed in the designated final locations directly from the excavation, or shall be placed in temporary stockpiles and later placed in the designated locations. Excavated materials which are too dry or too wet for immediate compaction shall be moistened or dried and conditioned to the proper moisture content. Moisture content alone shall not be reason for wasting material in a disposal area.

J. Engineer may direct excavations to be carried below the lines and grades shown on the drawings, if, in the opinion of the Engineer, such work is necessary to ensure adequate support of the proposed embankment, structure, pipe, etc. Payment for such authorized over-excavation and subsequent backfill shall be made at the applicable unit prices for excavation and earthfill.

3.4 DISPOSE OF EXCESS MATERIAL OFF-SITE

A. All excess or unsuitable excavated soil material and topsoil, unless otherwise noted on the construction plans, shall become the property of the Contractor and shall be disposed of properly away from the work site at locations identified by the Contractor. The item “Dispose Excess Material Off-Site” will be utilized to cover the costs of loading, transporting, and properly disposing of excess excavation soil and topsoil material that is either excess or determined to not be suitable to use on the project.

B. Payment will be made at the contract unit price per cubic yard based on the volume in its original location. This item shall only be used as deemed necessary by the Engineer.

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3.5 DISPOSE OF EXCESS MATERIAL ON-SITE

A. All excess or suitable excavated soil material and topsoil, identified on the construction plans, shall be placed properly at locations identified by in the construction plans. The item “Dispose Excess Material On-Site” will be utilized to cover the costs of loading, transporting, and properly disposing of excess excavation soil and topsoil material that is determined to be suitable to use on the project.

B. Payment will be made at the contract unit price per cubic yard based on the volume in its original location. This item shall only be used as deemed necessary by the Engineer.

3.6 BORROW PIT OPERATION

A. Borrow for embankment shall come from the required excavations and borrow area(s), as designated on the plans. The location of borrow areas shall be approved by the Engineer prior to use of the borrow area.

B. All borrow pits shall be kept neat and orderly. Work pits in a systematic manner. Keep borrow pits graded to drain and take all necessary precautions to minimize erosion. The Contractor shall review excavation plans with the Engineer prior to any excavation from borrow areas. Leave all surplus material in the borrow pits, but Contractor is to manage borrow pit operation and excavation to assure enough suitable material is excavated to complete the embankment construction volume(s) required under the contract. Do not excavate material that will not be installed on this project.

Maintain access roads as necessary at Contractors expense. Finish slopes shall be no steeper than 3H:1V. Slope to drain and blend neatly with surrounding terrain at completion of borrow operations.

3.7 REMOVAL OF WATER

A. Provide and operate equipment adequate to keep all excavations and trenches free of water.

Remove all water during periods when concrete is being deposited, when pipe is being laid, during the placing of backfill, and at such other times as required for efficient and safe execution of the work. Avoid settlement or damage to adjacent property. Dispose of water in a manner that will not damage adjacent property. When dewatering open excavations, dewater a point below the bottom of the excavation when possible. Design dewatering system to prevent removal of fines from existing ground.

3.8 FOUNDATION PREPARATION FOR BACKFILL

A. General: After stripping and foundation excavation are completed, remove all loose and objectionable materials and surface irregularities. Excavate areas adjoining the embankment foundation and all creek channel or ox-bow remnants which pass through the embankment foundation to slope(s) not steeper than 2:1, or as indicated on the drawings, to create smooth transitions for proper compaction and backfilling. Prepare the excavated foundation as described hereinafter and protect the prepared embankment foundation from drying, freezing, and softening from excessive moisture until the overlying embankment is placed and compacted. After foundation preparation, the foundation surface shall be free from soft areas and surface irregularities and shall

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provide a firm foundation upon which embankment backfill can be placed. Obtain the Engineer's approval of the prepared foundation surface prior to placing overlying backfill material.

3.9 CONSTRUCTION ROADS

A. Construct and maintain roads necessary for temporary site access for construction. Construction roads shall not cut into the dam embankments. Any cut into dam abutments shall be repaired to the natural slope with compacted dam embankment material. Compaction shall be as specified for earth embankment. Repairs shall be made at the Contractor's expense. At the completion of the project, scarify, disc and regrade all construction roads to match the surrounding topography. Compact as required by Section 02223 - Backfilling. Spread topsoil as required by Section 02223, and seed as specified in Section 02936 - Seeding.

B. Notify Engineer of unexpected subsurface conditions and discontinue affected work in area until notified to resume work.

3.10 FIELD QUALITY CONTROL

A. Section 01400 - Quality Control: Field inspection and testing.

BACKFILLING 02223-1

SECTION 02223

BACKFILLING

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Construction of fills, backfills, and embankments.

B. Site grading.

C. Compaction requirements.

1.2 RELATED SECTIONS

A. All sections.

1.3 MEASUREMENT AND PAYMENT

A. Section 01250 – Measurement and Basis of Payment.

1.4 REFERENCES

A. ASTM 0698 - Moisture-Density Relations of Soils and Soil-Aggregate Mixtures Using 5.5 lb Rammer and 12 inch drop.

B. ASTM 04253 - Maximum Index Density and Unit Weight of Soils using a Vibratory Table.

C. ASTM 04254 - Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density.

D. ASTM 01556 - Test Method for Density of Soil in Place by the Sand-Cone Method.

E. ASTM 02167 - Test Method for Density and Unit Weight of Soil in Place by the Rubber Balloon Method.

F. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in place by Nuclear Methods (Shallow Depth).

G. ASTM 03017 - Test Methods for Moisture Content of Soil and Soil-Aggregate Mixtures.

BACKFILLING 02223-2

2.1 FILL MATERIALS

A. Soil materials as specified in Section 02205.

B. Aggregate Materials as specified in Section 02207.

2.2 BEDDING MATERIALS

A. Section 02225 – Trenching.

2.3 WATER FOR COMPACTION

A. Furnish as necessary to accomplish specified compaction.

2.4 FILTER FABRIC & EROSION CONTROL MATTING

A. Section 02246 – Geotextiles.

2.5 COMPACTION EQUIPMENT

A. Compaction equipment shall be of suitable type and adequate to obtain the densities specified.

Smooth steel-wheeled rollers will not be permitted for compaction of onsite materials;…