ATTACHMENT 2 - PWS - CONSTRUCTION DRAWINGS AND SPECIFICATIONS.pdf

USDA-NRCS-OR Page 1 of 23 February 2021

UNITED STATES DEPARTMENT OF AGRICULTURE

NATURAL RESOURCES CONSERVATION SERVICE

1201 NE Lloyd Blvd Suite 900

Portland, Oregon 97232

(503) 414-3200

CONSTRUCTION DRAWINGS AND SPECIFICATIONS

PROJECT: Antelope Flats WRP Hydro Restoration PRACTICE CODE: 582, 657

LOCATION: SEC: 33 T40S R 14E JOB CLASS: IV, V

OWNER: Rich Rice

ADDRESS: PO Box 369

Clements, CA 95227

PREPARED BY: Roslyn Gray, P.E., Brian A. Bennett

DATE: February 2021

DESIGN REVIEWED BY: /s/ Molly Dawson, P. E.

DESIGN APPROVED BY: /s/

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TABLE OF CONTENTS

SPECIFICATION PAGE

GENERAL REQUIREMENTS 3

CONSTRUCTION SPECIFICATIONS 5

CS-OR-002 CLEARING AND GRUBBING 6

CS-OR-003 STRUCTURE REMOVAL 7

CS-OR-005 POLLUTION CONTROL 8

CS-OR-007 CONSTRUCTION SURVEYS 10

CS-OR-008 MOBILIZATION AND DEMOBILIZATION 14

CS-OR-011 REMOVAL OF WATER 15

CS-OR-023 EARTHFILL 17

CS-OR-201 STRIPPING 21

CS-OR-202 EXCAVATION, COMMON 22

CS-OR-231 VEGETATION OF CONSTRUCTION SITES 23

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UNITED STATES DEPARTMENT OF AGRICULTURE

NATURAL RESOURCES CONSERVATION SERVICE

OREGON

GENERAL REQUIREMENTS

General:

This construction plan set forth the requirements for this installation as shown on the drawings and described in the construction specifications and material specification. The project shall be constructed at the location and to the lines and grades as shown on the drawings in accordance with the construction and material specifications.

Responsibilities:

a. Requesting Agency:

The Requesting Agency (NRCS) is the official spokesperson for this project. The Requesting Agency is the entity who developed the construction plans, made all contractual agreements, ensures construction is in accordance with the requirements as set forth in the plans, and prepares as-built drawings of the project. The Requesting Agency is the sole person who can authorize any changes during construction that incur financial obligations.

b. Servicing Agency:

The Servicing Agency is the NRCS representative who has the authority to review the practice during construction and make necessary tests to ensure that all work is in compliance with the construction plan and specifications. The Servicing Agency obtains all permits. The Servicing Agency reviews all construction changes and ensures that the requesting agency approves prior to installation. The Servicing Agency maintains a job diary and all construction documentation.

c. Contractor:

The Contractor has a contractual agreement with the servicing agency for the project installation as set forth in the construction plan. The Contractor shall not make changes to the construction plan without NRCS review and Requesting Agency / Servicing Agency approval. The Contractor shall comply with all applicable permits and conduct the work in a safe manner.

Construction Plan:

a. Specifications:

The construction specifications and material specifications describe minimum acceptable quality of work and materials for the project. The material specifications may also reference a commercial standard such as the American Society of Testing Materials, ASTM, which identifies materials. Commercial standards set forth the minimum acceptable quality of identified materials within the industry. If a conflict arises between the drawings and specifications, the specification governs the work and/or material.

b. Drawings:

The drawings are a visual representation to supplement construction and material specifications. The drawings include location, profiles, sections, details and notes necessary to describe the work. The drawings for this project consist of 16 sheets and are labeled Antelope Flats WRP Hydro Restoration .

NO CHANGES ARE TO BE MADE IN THE DRAWINGS OR SPECIFICATIONS WITHOUT PRIOR

APPROVAL OF NRCS.

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Permits:

All permits, rights of ways, and/or easements that are applicable for the construction and/or operation are the responsibility of the Servicing Agency and shall be available for review by NRCS prior to the start of construction.

Safety:

The Contractor is responsible for compliance with all state and local laws, ordinances, codes, and/or regulations applicable for the construction. The Servicing Agency and/or Requesting Agency representative will document any safety violations witnessed.

Servicing Agency Acknowledgement:

The Servicing Agency acknowledges that:

a. They have received a copy of the construction drawings and specifications, and that they have an understanding of the contents, and the requirements.

b. They understand that NRCS makes no representation as to the existence or non-existence of utilities. It is the responsibility of landowners, operators and contractors to comply with the provisions of ORS 757.541 to

757.571. Landowners, operators and contractors will be liable for any damage resulting from disruption of service caused by construction activities. The phone number for the utility location service in Oregon is 1-800- 332-2344.

c. They understand that maintenance of the installed work is necessary for proper performance during the project life.

Accepted by: /s/ Date:

Final Acceptance:

The NRCS final acceptance inspection of the project will be performed by the design engineer /or delegate during construction and after the work has been completed. If deficiencies are found, the NRCS design engineer may prepare a written report to document the deficiencies for corrective action.

I have made an onsite inspection of the site (or I am accepting Servicing Agency documentation) and have determined that the job as completed does conform to the drawings, construction, and practice specifications.

Construction Certification by:

/s/ Date NRCS Representative

Job Title:

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CONSTRUCTION SPECIFICATIONS

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CONSTRUCTION SPECIFICATION

CS-OR-002 CLEARING AND GRUBBING

002.1 Scope

The work consists of clearing and grubbing and disposal of trees, snags, logs, brush, stumps, shrubs, and rubbish from the designated areas.

002.2 Protection of Existing Vegetation

Trees and other vegetation designated to remain undisturbed shall be protected from damage throughout the duration of the construction period. Any damages resulting from the contractor's operations or neglect shall be repaired by the contractor.

Earthfill, stockpiling of materials, vehicular parking, and excessive foot or vehicular traffic shall not be allowed within the drip line of vegetation designated to remain in place. Vegetation damaged by any of these or similar actions shall be replaced with viable vegetation of the same species, similar condition, and like size unless otherwise approved by the contracting officer.

Any cuts, skins, scrapes, or bruises to the bark of the vegetation shall be carefully trimmed and local nursery accepted procedures used to seal damaged bark.

Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree trunk. All roots 1-inch or larger in diameter that are cut, broken, or otherwise severed during construction operations shall have the end smoothly cut perpendicular to the root. Roots exposed during excavation or other operations shall be covered with moist earth or backfilled as soon as possible to prevent the roots from drying out.

002.3 Marking

The limits of the area(s) to be cleared and grubbed will be marked by stakes, flags, tree markings, or other suitable methods. Trees to be left standing and uninjured will be designated by special markings placed on the trunk about 6 feet above the ground surface.

002.4 Clearing and Grubbing

All trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials shall be cleared from within the limits of the designated areas. Unless otherwise specified, all stumps, roots, and root clusters that have a diameter of 1 inch or larger shall be grubbed out to a depth of at least 2 feet below subgrade for concrete structures and 1 foot below the ground surface at embankment sites and other designated areas.

002.5 Salvage

Trees to be salvages for saw logs shall be trimmed and cut to planned lengths and hauled to the loading area.

Brush piles for wildlife shall be established as shown on the drawings.

002.6 Disposal

All materials cleared and grubbed from the designated areas shall be disposed of at locations shown on the drawings or in a manner specified in Section 002.7 of this specification. The contractor is responsible for complying with all local rules and regulations and the payment of any and all fees that may result from disposal at locations away from the project site.

002.7 Items of Work and Construction Details

This Item of Work pertains to the removal of vegetation from designated earthwork areas and planned haul routes.

All materials cleared and grubbed from specified areas shall be disposed of onsite at approved upland locations designated during the preconstruction meeting.

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CS-OR-003 STRUCTURE REMOVAL

003.1 Scope

The work shall consist of the removal, salvage, and disposal of structures (including fences) from the designated areas.

003.2 Marking

Each structure or structure part (or designated area around the structure) to be removed will be marked with stakes, flags, paint, or other suitable method.

003.3 Removal

Structures shall be removed to the extent and depth shown on the drawings or as designated by a qualified NRCS representative.

003.4 Salvage

Structures or structure parts that are designated to be salvaged shall be carefully removed and neatly placed in the specified or approved storage location. Salvaged structures that are capable of being disassembled shall be dismantled into individual members or sections. Such structures shall be neatly and systematically match marked with paint before disassembly. All connectors and other parts shall be marked to indicate their proper location within the structure and shall be fastened to the appropriate structural member or packed in suitable containers.

Material from fences designated to be salvaged shall be placed outside the work area on the property on which the fence was originally located. Fence wire shall be rolled into uniform rolls of suitable size and neatly piled with other salvaged materials. Posts and rails shall be neatly stacked.

003.5 Disposal of Refuse of Materials

Refuse materials resulting from structure removal shall be disposed of in a manner and at locations specified in Section 003.6 of this specification or in an acceptable manner and at locations approved by the NRCS representative. Disposal by burning shall be in accordance with local rules and regulations.

003.7 Items of Work and Construction Details

This Item of Work pertains to the removal and disposal of culverts and associated infrastructure, as shown on the drawings.

All removed infrastructure shall be disposed of offsite in an acceptable manner, as determined during the preconstruction meeting.

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CONSTRUCTION SPECIFICATION

CS-OR-005 POLLUTION CONTROL

005.1 Scope

The work consists of installing measures or performing work to control erosion and minimize the production of sediment and other pollutants to water and air from construction activities.

The following BioPreferred® product categories are applicable to this specification:

mulch and compost materials erosion control materials fertilizers dust suppressants agricultural spray adjuvants

005.2 Material

Silt fence shall conform to the requirement of Materials Specification MS-OR-592, Geotextile. All other material furnished shall meet the requirements of the material specifications listed in section 005.8 of this specification.

005.3 Erosion and sediment control measures and works

The measures and works shall include, but are not limited to, the following:

Staging of earthwork activities—The excavation and moving of soil materials shall be scheduled to minimize the size of areas disturbed and unprotected from erosion for the shortest reasonable time.

Seeding—Seeding to protect disturbed areas shall occur as soon as reasonably possible following completion of that earthwork activity.

Mulching—Mulching to provide temporary protection of the soil surface from erosion.

Diversions—Diversions to divert water from work areas and to collect water from work areas for treatment and safe disposition. They are temporary and shall be removed and the area restored to its near original condition when the diversions are no longer required or when permanent measures are installed.

Stream crossings—Culverts or bridges where equipment must cross streams. They are temporary and shall be removed and the area restored to its near original condition when the crossings are no longer required or when permanent measures are installed.

Sediment basins—Sediment basins collect, settle, and eliminate sediment from eroding areas from impacting properties and streams below the construction site(s). These basins are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Sediment filters—Straw bale filters or geotextile silt fences trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under or around them. Silt fences shall be installed and maintained in accordance with ASTM D6462. These filters are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures. These works are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Other—Additional protection measures as specified in section 8 of this specification or required by Federal, State, or local government.

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005.4 Chemical pollution

The contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to collect and temporarily contain chemical pollutants, such as drained lubricating or transmission fluids, grease, soaps, concrete mixer washwater, or asphalt, produced as a by-product of the construction activities. Pollutants shall be disposed of in accordance with appropriate state and Federal regulations. At the completion of the construction work, tanks, barrels, and sumps shall be removed and the area restored to its original condition as specified in section 8 of this specification. Sump removal shall be conducted without causing pollution.

Sanitary facilities, such as chemical toilets, or septic tanks shall not be located next to live streams, wells, or springs. They shall be located at a distance sufficient to prevent contamination of any water source. At the completion of construction activities, facilities shall be disposed of without causing pollution as specified in section 8 of this specification.

005.5 Air pollution

The burning of brush or slash and the disposal of other materials shall adhere to state and local regulations.

Fire prevention measures shall be taken to prevent the start or spreading of wildfires that may result from project activities.

Firebreaks or guards shall be constructed and maintained at locations shown on the drawings.

All public access or haul roads used by the contractor during construction of the project shall be sprinkled or otherwise treated to fully suppress dust. All dust control methods shall ensure safe construction operations at all times. If chemical dust suppressants are applied, the material shall be a commercially available product specifically designed for dust suppression and the application shall follow manufacturer's requirements and recommendations. A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to the engineer 5 working days before the first application.

005.5 Other environmental considerations

Dust Control - All public access or haul roads used by the contractor during construction activities project shall be sprinkled or otherwise treated to fully suppress dust.

Staging Equipment - All construction equipment shall be staged in a location and manner to minimize air, soil and water pollution.

Storage of Fuel and Lubricants - All fuel and lubricants shall be stored in containers and areas that are in conformance with the Oregon State Department of Environmental Quality and local regulations. If a spill of chemical pollutants such as fuel or hydraulic fluid should occur, immediately attempt to contain the spilled material. The following procedures shall be followed:

(a) For spillage on land, construct earthen berms or use other suitable barricade material of sufficient size to contain the spill and keep it from spreading.

(b) For spillage on water, attempt to isolate and contain the spilled material. Commercial booms or other suitable materials shall be kept on site during construction to contain fuel and oil spills on water.

(c) Call the Oregon Emergency Response System (ORES) at (800)452-0311.

Servicing and Refueling Equipment - All fuel and lubricants used in the servicing of construction equipment shall be done in a manner that avoids spills and over filling. The Oregon State Department of Environmental Quality shall be notified immediately of any spill and the operator shall contain the spillage.

Sanitary Facilities - Sanitary facilities such as chemical toilets shall be located at least 100 feet from water bodies to prevent contamination of surface or subsurface water.

Environmentally Sensitive Areas - All environmentally sensitive areas, as shown on the drawings or as flagged at the construction site, shall be avoided. If human remains are discovered stop construction immediately, secure the site and contact the County Sheriff. If cultural materials are discovered stop construction immediately and contact the NRCS

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Cultural Resources Specialist. The contractor shall be responsible for mitigating any damages to sensitive areas that are a result of construction activities not approved by the NRCS technician.

005.6 Maintenance, removal, and restoration

All pollution control measures and temporary works shall be adequately maintained in a functional condition for the duration of the construction period. All temporary measures shall be removed and the site restored to near original condition.

005.7 Items of work and construction details

This Item of Work pertains to measures taken by the Contractor to minimize disturbance to the project site and surrounding resources.

The Landowner shall obtain all permits necessary to successfully construct the project, including but not limited to:

Department of State Lands, Department of Environmental Quality, U.S. Army Corps of Engineers, Oregon Department of Fish and Wildlife, and U.S. Fish and Wildlife Service.

The Contractor shall take all precautions necessary to prevent pollution of adjacent waters and wetland, and shall comply with permit requirements and local, state, and federal regulations. The Contractor shall provide an erosion and sediment control plan for approval by the Project Engineer prior to commencing earthwork activities. An emergency spill kit and list of emergency contacts shall be onsite for the duration of construction activities, including 24-hour emergency contact information for the Contractor.

Construction operations, including haul routes, shall be carried out in a manner that erosion, air and water pollution are minimized and held within the legal limits. All work shall be scheduled to take advantage of environmental soil moisture conditions. Soil moisture is crucial for proper compaction. Water is not available onsite if soil conditions are too dry. The contractor shall schedule the work appropriately.

Equipment, fuel and other supplies shall be staged at approved locations a minimum of 150 feet from waterways, in areas designated during the pre-construction meeting. All power equipment used within 150 feet of any waterway shall be inspected daily for fluid leaks. All stationary power equipment, such as generators, within 150 feet of waterways shall be diapered to prevent leaks.

The Contractor shall provide a Work Area Isolation Plan, including a Construction Site De-watering Plan, for approval by the Project Engineer prior to commencing earthwork activities. Refer to CS-OR-011 REMOVAL OF WATER.

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CS-OR-007 CONSTRUCTION SURVEYS

07.1 Scope

The work consists of performing all surveys, measurements, and computations required by this specification.

07.2 Equipment and material

Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equipment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibration tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer. Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer’s recommendations.

Material is field notebooks, stakes, templates, platforms, equipment, spikes, steel pins, tools, and all other items necessary to perform the work specified.

07.3 Quality of work

All work shall follow recognized professional practice and the standards of the industry unless otherwise specified in Section 007.8 of this specification. The work shall be performed to the accuracy and detail appropriate for the type of job. Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized to facilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires little or no manual recording of field data shall have survey information documented as outlined in Section 007.8 of this specification.

All computations shall be mathematically correct and shall include information to identify the bid item, date, and who performed, checked, and approved the computations. Computations shall be legible, complete, and clearly document the source of all information used including assumptions and measurements collected.

If a computer program is used to perform the computations, the contractor shall provide the engineer with the software identification, vendor’s name, version number, and other pertinent data before beginning survey activities.

Computer generated computations shall show all input data including values assigned and assumptions made.

The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01 foot.

Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feet shall not exceed plus or minus 0.1 times the square root of the traverse distance in miles. Linear measurements shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in Section 007.8 of this specification. The angular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles turned.

The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feet for sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular to the centerline. Significant breaks in grade shall be determined for cross sections. Distances shall be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

Unless otherwise specified in Section 007.8 of this specification, measurements for stationing and establishing the location of structures shall be made to the nearest 0.1 foot.

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest

0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

07.4 Primary control

The baselines and bench marks for primary control, necessary to establish lines and grades needed for construction are shown on the drawings and have been located on the job site.

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These baselines and bench marks shall be used as the origin of all surveys, layouts, and measurements to establish construction lines and grades. The contractor shall take all necessary precautions to prevent the loss or damage of primary control points. Any stakes or control points lost or damaged by construction activity will be reestablished by the contractor or at contractor expense.

07.5 Construction surveys

Before work starts that requires contractor performed surveys, the contractor shall submit in writing for the engineer’s review: the name, qualifications, and experience of the individuals to be assigned to the survey tasks.

Method 1 — Contractor performed surveys shall include:

1. checking and any supplemental or interim staking

2. performing quantity surveys, measurements, and computations for progress payment

3. other surveys as described in Section 007.8 of this specification

Method 2 — Contractor performed surveys shall consist of all work necessary for:

1. establishing line and grade for all work

2. setting slope stakes for all work

3. checking and any supplemental or interim staking

4. establishing final grade stakes

5. performing quantity surveys, measurements, and computations for progress payment

6. other surveys as described in Section 007.8 of this specification

Method 3 — Contractor performed surveys shall consist of all work necessary for:

1. establishing line and grade for all work

2. setting slope stakes for all work

3. checking and any supplemental or interim staking

4. establishing final grade stakes

5. performing quantity surveys, measurements, and computations for progress payments

6. performing original (initial) and final surveys for determinations of final quantities

7. other surveys as described in Section 007.8 of this specification.

07.6 Staking

The construction staking required for the item shall be completed before work on any item starts.

Construction staking shall be completed as follows or as otherwise specified in Section 007.8 of this specification:

1. Clearing and grubbing — The boundary of the area(s) to be cleared and grubbed shall be staked or flagged at a maximum interval of 200 feet, closer if needed, to clearly mark the limits of work. When contractor staking is the basis for determining the area for final payment, all boundary stakes will be reviewed by the engineer before start of this work item.

2. Excavation and fill — Slope stakes shall be placed at the intersection of the specified slopes and ground line. Slope stakes and the reference stakes for slopes shall be marked with the stationing, required cut or fill, slope ratio, and horizontal distance from the centerline or other control line. The minimum requirements for placing slope stakes is outlined in Section 007.3, Quality of Work, of this specification.

3. Structures — Centerline and offset reference line stakes for location, alignment, and elevation shall be placed for all structures.

07.7 Records

All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose

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USDA-NRCS-OR Page 13 of 23 February 2021 or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work. Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

The construction survey records shall be available at all times during the progress of the work for examination and use by the engineer and when requested, copies shall be made available. The original field notebooks and other records shall be provided to and become the property of the owner before final payment and acceptance of all work.

Complete documentation of computations and supporting data for progress payments shall be submitted to the engineer with each invoice for payment as specified in Section 007.8 of the specification. When the contractor is required to conduct initial and final surveys as outlined in Section 007.5, Construction Surveys, of this specification, notes shall be provided as soon as possible after completion to the engineer for the purpose of determining final payment quantities.

07.8 Items of work and construction details

Specific Site Requirements

All surveying, construction staking will be done by the contractor using Method 3 as outlined in section 07.5 in the above CS-OR-007 specification. The contractor will include the cost of all associated construction surveying into each bid item.

NRCS will reestablish horizontal and vertical control prior to construction and provide control point coordinates to the contractor upon request.

Site layout and flagging. Prior to construction, upon request, only the following will be flagged by NRCS and/or NRCS representative to identify the following:

Points of Access Critical Areas

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CS-OR-008 MOBILIZATION AND DEMOBILIZATION

008.1 Scope

The work consists of the mobilization and demobilization of the contractor's forces and equipment necessary for performing the work required as well as any work required to remove excess materials and equipment from the work site once the project is complete.

008.2 Equipment and Material

Mobilization shall include all activities involved in the transportation of contractor's personnel, equipment, and operating supplies to the site; establishment of offices, buildings, and other necessary general facilities for the contractor's operations at the site; any permits, insurance, and/or bonds required to do the work; and other items specified in Section 008.3 of this specification.

Demobilization shall include all activities involved in the transportation of personnel, equipment, and supplies not required or included in the contract from the site; including the disassembly, removal, and site cleanup of offices, buildings, and other facilities assembled on the site specifically for this contract.

008.3 Items of Work and Construction Details

This Item of Work pertains to mobilization and demobilization of construction forces, as described above.

The Contractor shall attend a pre-construction conference with NRCS, NRCS Representative and landowner, prior to commencing construction activities.

The Contractor shall route haul equipment so as to minimize compaction and disturbance of wetland areas and critical areas flagged in the field.

It is advised that the Contractor does not demobilize equipment prior to NRCS acceptance of completed activities.

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CONSTRUCTION SPECIFICATION

CS-OR-011 REMOVAL OF WATER

011.1 Scope

The work consists of the removal of surface water and ground water as necessary to perform the construction required by the contract in accordance with the specifications. It shall include: (1) constructing, installing, building, and maintaining all necessary temporary water containment facilities, channels, and diversions; (2) furnishing, installing, and operating all necessary pumps, piping, and other facilities and equipment; and (3) removing all such temporary works and equipment after their intended function is no longer required.

011.2 Diverting surface water

The contractor shall install, maintain, and operate all cofferdams, channels, flumes, sumps, and all other temporary diversion and protective works needed to divert streamflow and other surface water through or around the construction site. Control of surface water shall be continuous during the period that damage to construction work could occur. Unless otherwise specified and/or approved, the diversion outlet shall be into the same drainage way that the water would have reached before being diverted.

The contractor shall furnish the NRCS representative, in writing, a proposed plan for diverting surface water before beginning any construction activities for which a diversion is required, unless waived in Section 011.7 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

011.3 Dewatering the construction site

Foundations, cutoff trenches, and all other parts of the construction site shall be dewatered and kept free of standing water and muddy conditions as necessary for the proper execution of the work. The contractor shall furnish, install, operate, and maintain all drains, sumps, pumps, casings, well points, and all other equipment required to properly dewater the site as specified. Dewatering systems that cause a loss of soil fines from the foundation areas will not be permitted.

The contractor shall furnish the NRCS representative, in writing, a proposed plan for dewatering before commencing with any construction activity for which dewatering may be required, unless waived in Section 011.7 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities for completing the specified work.

011.4 Dewatering borrow areas

The contractor shall maintain all borrow areas free of surface water or otherwise provide for timely and effective removal of surface and subsurface water that accumulates within the borrow area, unless waived in Section 011.7 of this specification. Borrow material shall be processed as necessary to achieve proper and uniform moisture content at the time of placement.

011.5 Erosion and pollution control

Removal of water from the construction site, including the borrow areas, shall be accomplished so that erosion and the transporting of sediment and other pollutants are minimized. Dewatering activities shall be accomplished in a manner that the water table water quality is not altered. Pollution control activities shall not conflict with the requirements of CS-OR-005, Pollution Control, if it is a part of this contract.

011.6 Removal of temporary works

When temporary works are no longer needed, the contractor shall remove and return the area to a condition similar to that which existed before construction. Areas where temporary works were located shall be graded for sightly appearance with no obstruction to natural surface waterflows or the proper functioning and access to the works of improvement installed. The contractor shall exercise extreme care during the removal stages to minimize the loss of soil sediment and debris that was trapped during construction.

Pipes, casings, and any other material used to dewater the site shall be removed from temporary wells. The wells shall be filled to ground level with clean gravel or other suitable material approved by the NRCS representative. The contractor shall exercise extreme care to prevent pollution of the ground water by these actions.

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011.7 Items of work and construction details

This Item of Work pertains to site de-watering activities required to successfully implement the restoration plan.

The Contractor shall provide a Work Area Isolation plan to the Project Engineer for acceptance prior to commencement of construction activities, per CS-OR 011.3 above.

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CONSTRUCTION SPECIFICATION

CS-OR-023 EARTHFILL

023.1 Scope

The work consists of the construction of earth embankments, other earthfills, and earth backfills required by the drawings and specifications.

Earthfill is composed of natural earth materials that can be placed and compacted by construction equipment operated in a conventional manner.

Earth backfill is composed of natural earth material placed and compacted in confined spaces or adjacent to structures (including pipes) by hand tamping, manually directed power tampers or vibrating plates, or their equivalent.

023.2 Material

All fill material shall be obtained from required excavations and designated borrow areas. The selection, blending, routing, and disposition of material in the various fills shall be subject to approval by the engineer.

Fill materials shall contain no frozen soil, sod, brush, roots, or other perishable material. Rock particles larger than the maximum size specified for each type of fill shall be removed prior to compaction of the fill.

The types of material used in the various fills shall be as listed and described in the specifications and drawings.

023.3 Foundation preparation

Foundations for earthfill shall be stripped to remove vegetation and other unsuitable material or shall be excavated as specified.

Except as otherwise specified, earth foundation surfaces shall be graded to remove surface irregularities and shall be scarified parallel to the axis of the fill or otherwise acceptably scored and loosened to a minimum depth of 2 inches.

The moisture content of the loosened material shall be controlled as specified for the earthfill, and the surface material of the foundation shall be compacted and bonded with the first layer of earthfill as specified for subsequent layers of earthfill.

Earth abutment surfaces shall be free of loose, uncompacted earth in excess of 2 inches in depth normal to the slope and shall be at such a moisture content that the earthfill can be compacted against them to produce a good bond between the fill and the abutments.

Rock foundation and abutment surfaces shall be cleared of all loose material by hand or other effective means and shall be free of standing water when fill is placed upon them. Occasional rock outcrops in earth foundations for earthfill, except in dams and other structures designed to restrain the movement of water, shall not require special treatment if they do not interfere with compaction of the foundation and initial layers of the fill or the bond between the foundation and the fill.

Foundation and abutment surfaces shall be no steeper than one horizontal to one vertical unless otherwise specified.

Test pits or other cavities shall be filled with compacted earthfill conforming to the specifications for the earthfill to be placed upon the foundation.

023.4 Placement

Earthfill shall not be placed until the required excavation and foundation preparation have been completed and the foundation has been inspected and approved by the engineer. Earthfill shall not be placed upon a frozen surface nor shall snow, ice, or frozen material be incorporated in the earthfill matrix.

Earthfill shall be placed in approximately horizontal layers. The thickness of each layer before compaction shall not exceed the maximum thickness specified in Section 023.9 of this specification or shown on the drawings. Materials placed by dumping in piles or windrows shall be spread uniformly to not more than the specified thickness before being compacted.

Hand compacted earth backfill shall be placed in layers whose thickness before compaction does not exceed the maximum thickness specified for layers of earth backfill compacted by manually directed power tampers.

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Earth backfill shall be placed in a manner that prevents damage to the structures and allows the structures to assume the loads from the earth backfill gradually and uniformly. The height of the earth backfill adjacent to a structure shall be increased at approximately the same rate on all sides of the structure.

Earthfill and earth backfill in dams, levees, and other structures designed to restrain the movement of water shall be placed to meet the following additional requirements:

(a) The distribution of materials throughout each zone shall be essentially uniform, and the earthfill shall be free from lenses, pockets, streaks, or layers of material differing substantially in texture, moisture content, or gradation from the surrounding material. Zone earthfills shall be constructed concurrently unless otherwise specified.

(b) The surface of each layer shall be scarified parallel to the axis of the fill to a depth of not less than 2 inches before the next layer is placed.

(c) The top surface of embankments shall be maintained approximately level during construction with two exceptions: A crown or cross-slope of about 2 percent shall be maintained to ensure effective drainage, or as otherwise specified for drainfill or sectional zones.

(d) Dam embankments shall be constructed in continuous layers from abutment to abutment except where openings to facilitate construction or to allow the passage of streamflow during construction are specifically authorized in the contract.

(e) Embankments built at different levels as described under (c) or (d) above shall be constructed so that the slope of the bonding surfaces between embankment in place and embankment to be placed is not steeper than 3 feet horizontal to 1 foot vertical. The bonding surface of the embankment in place shall be stripped of all material not meeting the requirements of this specification and shall be scarified, moistened, and recompacted when the new earthfill is placed against it. This ensures a good bond with the new earthfill and obtains the specified moisture content and density at the contact of the inplace and new earthfills.

023.5 Control of moisture content

During placement and compaction of earthfill and earth backfill, the moisture content of the material being placed shall be maintained within the specified range.

The application of water to the earthfill material shall be accomplished at the borrow areas insofar as practicable.

Water may be applied by sprinkling the material after placement on the earthfill, if necessary. Uniform moisture distribution shall be obtained by disking.

Material that is too wet when deposited on the earthfill shall either be removed or be dried to the specified moisture content prior to compaction.

If the top surface of the preceding layer of compacted earthfill or a foundation or abutment surface in the zone of contact with the earthfill becomes too dry to permit suitable bond, it shall either be removed or scarified and moistened by sprinkling to an acceptable moisture content before placement of the next layer of earthfill.

023.6 Compaction

023.6.1 Earthfill

Earthfill shall be compacted according to the following requirements for the class of compaction specified:

Class A compaction — Each layer of earthfill shall be compacted as necessary to provide the density of the earthfill matrix not less than the minimum density specified in Section 10 or identified on the drawings. The earthfill matrix is defined as the portion of the earthfill material finer than the maximum particle size allowed in the reference compaction test method specified (ASTM D698 or ASTM D1557).

Class B compaction — Each layer of earthfill shall be compacted to a mass density not less than the minimum density specified.

Class C compaction — Each layer of earthfill shall be compacted by the specified number of passes of the type and weight of roller or other equipment specified or by an approved equivalent method. Each pass shall consist of at least one passage of the roller wheel or drum over the entire surface of the layer.

023.6.2 Earth Backfill

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Earth backfill adjacent to structures shall be compacted to a density equivalent to that of the surrounding inplace earth material or adjacent required earthfill or earth backfill. Compaction shall be accomplished by hand tamping or manually directed power tampers, plate vibrators, walk-behind, miniature, or self-propelled rollers. Unless otherwise specified heavy equipment including backhoe mounted power tampers or vibrating compactors and manually directed vibrating rollers shall not be operated within 3 feet of any structure. Towed or self-propelled vibrating rollers shall not be operated within 5 feet of any structure. Compaction by means of drop weights operating from a crane or hoist is not permitted.

The passage of heavy equipment will not be allowed:

(a) Over cast-in-place conduits within 14-days after placement of the concrete

(b) Over cradled or bedded precast conduits within 7 days after placement of the concrete cradle or bedding

(c) Over any type of conduit until the backfill has been placed above the top surface of the structure to a height equal to one-half the clear span width of the structure or pipe or 3 feet, whichever is greater, except as may be specified in Section 023.9 of this specification.

Compacting of earth backfill adjacent to structures shall not be started until the concrete has attained the strength specified in Section 023.9 of this specification for this purpose. The strength is determined by compression testing of test cylinders cast by the contractor's quality control personnel for this purpose and cured at the work site in the manner specified in ASTM C 31 for determining when a structure may be put into service.

When the required strength of the concrete is not specified as described above, compaction of earth backfill adjacent to structures shall not be started until the following time intervals have elapsed after placement of the concrete.

TABLE 023-1

Structure Time interval (days)

Vertical or near-vertical walls with earth loading on one side only 14

Walls backfilled on both sides simultaneously 7

Conduits and spillway risers, cast-in-place (with inside forms in place) 7

Conduits and spillway risers, cast-in-place (inside forms removed) 14

Conduits, pre-cast, cradled 2

Conduits, pre-cast, bedded 1

Cantilever outlet bents (backfilled both sides simultaneously) 3

023.7 Reworking or removal and replacement of defective earthfill Earthfill placed at densities lower than the specified minimum density or at moisture contents outside the specified acceptable range of moisture content or otherwise not conforming to the requirements of the specifications shall be reworked to meet the requirements or removed and replaced by acceptable earthfill. The replacement earthfill and the foundation, abutment, and earthfill surfaces upon which it is placed shall conform to all requirements of this specification for foundation preparation, approval, placement, moisture control, and compaction.

023.8 Testing

During the course of the work, the contractor shall perform quality control tests, as applicable, to identify earthfill and earth backfill materials; determine the reference maximum density and optimum moisture content; and document that the moisture content of material at the time of compaction and the density of earthfill and earth backfill in place conform to the requirements of this specification.

Determining Reference Maximum Density and Optimum Moisture Content—For Class A compaction, the reference maximum density and optimum moisture content shall be determined in accordance with the compaction test and method specified on the drawings or in Section 023.9 of this specification.

Documenting Specification Conformance—In-place densities of earthfill and earth backfill requiring Class A compaction shall be measured in accordance with ASTM D1556, D2167, D2937, or D6938. Moisture contents of

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USDA-NRCS-OR Page 20 of 23 February 2021 earthfill and earth backfill at the time of compaction shall be measured in accordance with ASTM D2216, D4643, or D6938. Values of moisture content determined by ASTM D2216 are considered the true value of the soil moisture.

Values of moisture content determined by ASTM D4643 or D6938 shall be verified by comparison to values obtained by ASTM D2216. Values of in-place density and moisture content determined by these tests shall be compared to the minimum density and moisture content range specified on the drawings or in Section 023.9 of this specification.

Correction for Oversize Particles—If the materials to be used for earthfill or earth backfill contain more than 5 percent by dry weight of oversize rock particles (particles larger than those allowed in the specified compaction test and method), corrections for oversize particles shall be made using the appropriate procedures explained in ASTM D4718.

023.9 Items of work and construction details

This Item of Work pertains to the placement and compaction of earthfill materials as specified in the drawings.

Per 023.4 PLACEMENT:

Earthfill material for the construction of open channel/streambanks and ditch plugs shall be placed in approximately uniform horizontal layers of not more than 8 inches in thickness prior to compaction.

Earthfill material for the construction of ditchfill and microtopographic mounds shall be placed in approximately uniform horizontal layers of not more than 12 inches in thickness prior to compaction.

Per CS-OR 023.5 CONTROL OF MOISTURE CONTENT:

Moisture content of earthfill for the Lost Creek Bend Reconstruction shall be within a molding water content of 23%

- 26%, sufficient to obtain optimal compaction and a suitable bond between layers of placed material.

Moisture content of earthfill for the construction of the remaining open channel sites, ditch plugs, and ditchfill shall be sufficient to obtain adequate compaction and a suitable bond between layers of placed material.

PER 023.6.1 COMPACTION, EARTHFILL, Class C compaction shall apply:

Care shall be taken to adequately compact the first lift of material against the prepared foundation, to ensure an…