A06_22R0029_Specs_1.pdf

CONSTRUCTION SPECIFICATIONS

MONIDA CREEK DAM #1 AND #2 RECONSTRUCTION

TABLE OF CONTENTS

Contents

Contents

100 GENERAL

201 MOBILIZATION/DEMOBILIZATION

202 SITE PREPARATION

203 EXCAVATION

204 EMBANKMENT CONSTRUCTION

205 WATER

305 CLASS II ROCK RIPRAP & 3/4”-INCH CRUSHED AGGREGATE MATERIALS

401 SOIL EROSION AND POLLUTION CONTROL

402 TOPSOIL & SEEDING

100 GENERAL

100.10 REFERENCES

ASTM International (ASTM)

1. ASTM D 422 Particle-Size Analysis of Soils

2. ASTM D 653 Terminology Relating to Soil, Rock, and Contained

Fluids

3. ASTM D 698 Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3)

4. ASTM D 1140 Amount of Material in Soils Finer than the No. 200

(75-µm) Sieve

5. ASTM D 1556 Density and Unit Weight of Soil in Place by Sand- Cone Method

6. ASTM D 2216 Laboratory Determination of Water (Moisture)

Content of Soil and Rock by Mass

7. ASTM D 2487 Classification of Soils for Engineering Purposes (Unified Soil Classification System)

8. ASTM D 4253 Maximum Index Density and Unit Weight of Soils

Using a Vibratory Table

9. ASTM D 4254 Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density

10. ASTM D 4318 Liquid Limit, Plastic Limit, and Plasticity Index of

Soils

11. ASTM D 4643 Determination of Water (Moisture) Content of Soil by the Microwave Oven Heating

12. ASTM D 5080 Rapid Determination of Percent Compaction

13. ASTM D 6938 In-Place Density and Water Content of Soil and Soil-

Aggregate by Nuclear Methods

100.20 DEFINITIONS

A. Use definitions from ASTM D 653.

B. Borrow: Material from required site excavations or from designated borrow areas.

C. Coverage: One “coverage” is the result of successive passes by a piece of compaction equipment, which by means of sufficient overlap, ensures that all areas has been subjected to one pass of the compaction equipment.

D. Dam Embankment: All portions of the dam embankment including Previously placed material, Compacted Embankment.

E. Fines: Material passing the No. 200 sieve size (ASTM D 1140).

F. Optimum Water Content: The water content that will result from the estimated maximum dry unit weight of soil when subjected to the ASTM D 698 compaction test.

G. Percent Compaction: The ratio expressed as a percentage of the in place dry density to the estimated maximum dry density, in accordance with ASTM D 698, at the location of the in-place density test.

H. Percent Relative Compaction: The percent compaction of a cohesionless soil where the laboratory maximum density is determined by Maximum Index Unit Weight test (ASTM 4253).

I. Percent Relative Density: The ratio of, (1) the difference between void ratio of a cohesionless soil in the loosest state and any given void ratio, to (2) the difference between its void ratios in the loosest state and densest state (ASTM D 4254).

J. Proof Rolling: Rolling a soil surface with a minimum of 4 passes with compaction equipment for the purpose of detecting loose or soft areas.

K. Suitable Material: Material imported or from required excavations that meets the specification requirements for a designated fill.

L. Topsoil: Native surface soil capable of supporting native plant growth.

M. Unsuitable Materials: Materials that contain waste, debris, roots, organic matter, frozen matter, stone or rock with any dimension greater than 6-inches, or any other materials determined by the Contracting Officer that does not meet the requirements for any embankment zone or required fill.

N. Well Graded: A mixture of particle sizes that has no specific concentration, or lack thereof, of one or more sizes. A material that, when compacted, produces a strong, relatively incompressible soil mass with a minimum of voids.

100.30 SUBMITTALS

A. Source Submittals Submit test results from a qualified testing agency demonstrating that off-site sources conform to the requirements of this section. Test reports shall not be more than 2 years old at the time of submittal. Provide submittals a minimum of 30 days prior to delivery of material to site.

201 MOBILIZATION/DEMOBILIZATION

201.10 DESCRIPTION

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

201.20 METHOD

The Contractor shall conduct all mobilization operations in a timely orderly, manner. Unless otherwise approved by the CO, mobilization operations shall commence no later than one week after the pre- construction meeting.

Demobilization shall commence no later than one week after project completion and be finished within two weeks of project completion. During all operations, the Contractor is responsible for maintaining public and private property in original condition.

201.30 METHOD OF MEASUREMENT

Mobilization shall be measured on a unit basis. The unit shall be shown in the Bid Schedule for the pay item corresponding to this specification number. Mobilization shall be measured in the following manner: Lump Sum (LS):

Mobilization shall be measured on a lump sum basis.

201.40 METHOD OF PAYMENT

The completed work for Mobilization, measured as specified, shall be paid for at the contract unit price. Payment shall be made according to the following schedule:

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

2) 100% of contract unit price at project completion.

The unit price bid for mobilization shall include supplying all materials, equipment, labor and any incidental items necessary for performing all mobilization operations described in this specification. Unless separate mobilizations are required to complete different phases of the work shown on the plans.

Payment Items:

Item Spec. Bid

No.

Description Unit Quantity

1 201 Mobilization/Demobilization LS 1.00

202 SITE PREPARATION

202.10 DESCRIPTION

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

a) Removal and proper disposal of all engineered materials that had been used in erosion control.

b) Removal from project area and disposal at designated site of all trees, roots, brush, stone, rubbish and all other surface litter in designated areas as directed in the plans.

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

d) Grubbing to remove grass and debris.

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

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

202.20 CONSTRUCTION METHODS

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

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

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

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

202.30 METHOD OF MEASUREMENT

Site preparation will not be measured as an item for the bid schedule and will be considered incidental to the construction process and should be accounted for in either 203 EXCAVATION or 204 CONSTRUCTION bid items.

202.40 METHOD OF PAYMENT

No direct payment for site preparation work will be made. Contractor shall include consideration for this item in the bid price for other scheduled items of the contract.

203 EXCAVATION

203.10 DESCRIPTION

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

In the case that drilling, and blasting is required, due to size of density of rock encountered, extra work will be considered.

203.20 CONSTRUCTION METHODS

203.21 SITE PREPARATION

Prior to any excavation, sites shall be cleared and grubbed with topsoil removed in accordance with the specification for 202 SITE PREPARATION. Material cleared and grubbed shall be disposed of as directed.

Topsoil removed shall be stockpiled and later re-spread on disturbed areas at a thickness of four (4) inches, unless otherwise specified.

203.22 EXCAVATION

Excavation shall mean the removal of all materials encountered within the limits of excavation as shown on the drawings or as staked by the Engineer. Excavation shall be performed in as nearly a continuous operation as possible, trimmed and leveled to conform to the required lines, grades and tolerances. Areas over-excavated shall be replaced with suitable materials compacted to the specified compaction in plans and specifications as directed.

Suitable material excavated from the excavation areas shown on the plans shall be used in any embankments called for on the plans. This shall include areas stripped of topsoil or unsuitable material that need to be backfilled with suitable material or key trenches. Placement of these embankments or backfills shall be done in accordance with the specification for 204 EMBANKMENT CONSTRUCTION.

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

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

203.23 DISPOSAL OF WASTE MATERIALS

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

203.24 CONTROL OF SURFACE AND SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work. Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

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

203.30 METHOD OF MEASUREMENT

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

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

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

203.40 METHOD OF PAYMENT

The completed work for excavation, measured as specified, shall be paid for at the contract unit price. The unit price bid for excavation shall include supplying all materials, equipment, labor and any incidental items necessary for performing all excavation operations described in this specification. No payment shall be made for dewatering or the control and drainage of surface/sub-surface water. No payment for excavation of suitable material will be made when excavating in a designated borrow area to obtain material that is to be placed, measured and paid in accordance with the specification for 204 EMBANKMENT CONSTRUCTION.

2 203 Excavation CY-P 9330.00

204 EMBANKMENT CONSTRUCTION

204.10 DESCRIPTION

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

a) Excavation of suitable materials from borrows or excavations.

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

c) Leveling and trimming of embankments and borrow areas.

204.20 CONSTRUCTION METHODS

204.21 SITE PREPARATION

Prior to any embankment or key trench construction, sites shall be cleared and grubbed with topsoil removed in accordance with the specification for 202 SITE PREPARATION. Material cleared and grubbed shall be disposed of as directed by the government. Topsoil removed shall be stockpiled and later re-spread on designated areas at a thickness of four (4) inches, unless otherwise shown on the plans.

204.22 FILL MATERIAL

Unless otherwise specified, all material shall be placed in loose lifts of not more than eight (8) inches thickness and shall be compacted by suitable compaction equipment to a minimum of 97% of maximum density as determined by the Standard Proctor Method ASTM D698. Moisture content shall be in the range of -l% to +3% of optimum moisture content. Field tests conforming to standard ASTM testing methods will be scheduled at the discretion of the Government to ensure compliance with these specifications.

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

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

204.23 KEY TRENCH CONSTRUCTION

The Contractor shall not commence key trench construction until such work as specified in the specification for 202 SITE PREPARATION has been completed and approved by the Government.

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

204.24 EMBANKMENT CONSTRUCTION

The Contractor shall not commence embankment construction until such work as specified in the specification for 202 SITE PREPARATION and the key trench, where specified, has been completed and approved by the government.

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

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

All embankments will be construction staked to final grade elevations shown on the drawings. Embankments shall be brought to these elevations using embankment material graded to a tolerance of +/- 0.2 feet. Topsoil or Class II Rock Riprap materials are to be placed on top of embankment construction. Topsoil depths shall be four

(4) inches, unless otherwise specified, while Class II Rock Riprap/revetment depths shall be as specified on the drawings. All embankment construction must be as continuous as possible, and the fill maintained such that drainage is assured at all times.

Should fill settlement occur during the construction of the embankment and within seven days of substantial completion, and prior to acceptance of the work, additional material shall be placed and trimmed to achieve final grade by the Contractor at their own expense. After embankments have been constructed to grade, they shall be leveled and trimmed to conform to the lines, grades and cross-sections shown on the plans and/or as staked.

Approval of finished embankment may be made progressively during the course of construction upon the request of the Contractor. A completed embankment once approved by the CO shall not be used by the Contractor for haulage, access or other purposes without the consent of the government.

Water used in conjunction with embankment construction activities shall be applied and paid as part of the construction process and included in the bid price for embankment construction.

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

204.25 TRIMMING

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

204.26 HAUL ROADS AND BORROW AREAS

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

204.27 CONTROL OF SURFACE AND SUBSURFACE WATER

The Contractor is responsible for control of surface water, subsurface water, and drainage during the construction period. All temporary fills, crossings, and culverts necessary to promote drainage during construction will be installed and removed at the Contractor's expense prior to acceptance of the work. Any claims arising from upstream or downstream damages as a result of the construction or failure of these temporary works will be the Contractor’s responsibility.

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

204.30 METHOD OF MEASUREMENT

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

1) Cubic Yards (CY): Embankment shall be measured on a volume basis of placed embankment. The volume to be paid for shall be made by cross sectioning designated borrow areas minus topsoil quantities and using the average end method of volume calculation. No measurement shall be made for overbuild areas.

No separate measurement shall be made for the fill around pipes, pipeline, and water control structures. This work shall be considered incidental to those bid items.

204.40 METHOD OF PAYMENT

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

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

3 204 Embankment Construction CY 8770.00

4 204 Embankment Waste CY 560.00

205 WATER

205.10 DESCRIPTION

The work shall include the supply of all labor, material, and equipment required to add water to embankments as needed for dust, workability and to meet compaction. The work shall include:

a) Locating and procuring a suitable water source if not identified in plans.

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

c) Obtaining permits if required.

205.20 MATERIALS

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

205.30 CONSTRUCTION METHODS

Water shall be applied to the embankment areas (or borrow areas) in a way that maintains the specified moisture content. Sufficient equipment shall be on the project site to secure and maintain the specified moisture content until the required density is secured. Water shall be applied uniformly over the working area. Prewatering (moisture conditioning) with clay and silts may benefit placement and compaction efforts.

205.40 METHOD OF MEASUREMENT

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

205.50 METHOD OF PAYMENT

No direct payment for work described under this section will be made. Contractor shall include consideration for this item in the bid price for other scheduled items of the contract.

305 CLASS II ROCK RIPRAP & 3/4”-INCH CRUSHED AGGREGATE MATERIALS

305.10 DESCRIPTION

This work shall consist of supply and placement of rock Class II Rock Riprap and 3/4”-inch crushed aggregate as protective covering along the side slopes, bases of channels, slopes around culverts, and on embankments or such other places as may be indicated on the plans, as specified herein, or as directed by the Engineer.

305.20 MATERIALS

305.21 NON-WOVEN FILTER FABRIC

Unless otherwise specified, non-woven filter fabric shall be utilized, and considered incidental, in the installation of all Class II Rock Riprap and 3/4”-inch crushed aggregate. The filter fabric shall be a non-woven polyester or polypropylene geotextile. This geotextile shall have a minimum grab tensile strength of 150 pounds as determined by ASTM D4632. The geotextile shall have a maximum opening size equivalent to a #70 U.S.

standard sieve.

The contractor shall supply all pins and other items necessary to fasten the non-woven filter fabric to the ground so it will not slide or form gaps when placing rock Class II Rock Riprap.

All materials shall be handled and stored in a careful and workmen-like manner to the satisfaction of the engineer.

For concrete revetment, the geotextile shall be bonded to the base of the concrete block mats with an overlap of two to three feet incorporated on one end and one side adjacent to each other.

305.22 CLASS II ROCK RIPRAP

The contractor shall supply rock, which will consist of fieldstone or rough, unhewn quarry rock. Stone containing shale, sandstone, or other material that will disintegrate readily shall not be used. Class designations shall be based on the following gradations:

Riprap Class

Percent of Total Weight Smaller Than Given Size 30” 24” 18” 12” 9” 6” 3”

Class I 100 100 100 100 100 35-80 0-20 Class II 100 100 100 50-75 10-50 0-10

Class III 100 100 50-75 10-50 0-10

Class IV 100 85-100 60-80 20-40 0-20

If the rock riprap class designation is not specified on the construction plans, CLASS II rock riprap shall be acceptable. The rock shall be approved by the Government prior to installation.

305.23 ¾-INCH CRUSHED AGGREGATE

3/4”-inch crushed aggregate material shall consist of hard, durable particles or fragments of slag, stone, or gravel crushed of the required size and grading. Shall be visually free from organic matter and lumps or balls of clay and shall meet the requirements for the grading given.

3/4-Inch Crushed Aggregate shall meet the following gradation and requirements including added binder or blending material the maximum liquid limit for the material passing the No. 40 sieve is 35. The Plasticity Index for the material passing the No. 40 sieve may vary between 0 and 6. At least 35 percent by weight of the 3/4”-inch crushed aggregate retained on the No. 4 sieve must have at least one mechanically-fractured face. Test for determining percentage of mechanically fractured particles shall be according to MDT, MT-217 with the following gradation:

Percent (%) Passing by Weight 3/4” Sieve #4 Sieve #10 Sieve #200 Sieve

100 40-80 25-60 5-20

The 3/4”-inch crushed aggregate material shall be from a source approved by the Engineer. Any other aggregate as called for on the plans shall be supplied in a manner that meets the gradation as specified. All materials shall be approved by the government prior to installation.

305.30 CONSTRUCTION METHODS

305.31 SUBGRADE PREPARATION

The areas on which the riprap or other 3/4”-inch crushed aggregate is to be placed shall be graded to the lines shown on the plans. The soil surface shall be smooth and free from any obstructions to provide adequate contact area between the soil and the non-woven filter fabric.

305.32 NON-WOVEN FILTER FABRIC

The non-woven filter fabric shall be placed under all Class II Rock Riprap and 3/4”-inch crushed aggregate in such a way that there is adequate contact area between the soil and the fabric. Installation shall start on the downstream end of the slope. Pins shall be installed to prevent the non-woven filter fabric from sliding or forming gaps during installation of the filter material and placement of the rock Class II Rock Riprap.

When non-woven filter fabric is to be placed on a slope, an anchor trench shall be constructed on the top of the slope and a toe trench shall be constructed on the lower end of the installation. The trenches shall be perpendicular to the slope and must be at least one foot wide and one foot deep. The non-woven filter fabric shall be placed in the anchor trench and the toe trench. The trenches shall be backfilled and compacted to adequately anchor the non-woven filter fabric.

Where a seam is needed to provide a continuous coverage of the non-woven filter fabric, the two pieces of filter material shall be overlapped a minimum of two feet. Pins shall be placed in the overlap area to prevent slipping during placement of the filter material and rock Class II Rock Riprap.

Great care shall be taken to protect the non-woven filter fabric from damage either from the wheels or tracks or any sliding caused by the equipment. The fabric shall not be exposed to the sun for more than seven days. If the fabric meets the requirements of ASTM D4255, less than 30% strength loss at 500 hours, the maximum exposure shall be 30 days.

305.33 CLASS II ROCK RIPRAP

Class II Rock Riprap shall be placed by equipment capable of controlling the drop of the rock Class II Rock Riprap. The maximum drop of the rock shall be three (3) feet. Pushing or rolling rocks over the geotextile will not be allowed. Placement will be in such a manner that the smaller stones will be uniformly distributed throughout the mass. Sufficient handwork shall be done to provide a neat and uniform surface, with the depth being specified herein and as shown on the plans. The surface may not vary from the theoretical surface by more than 4" at any point for Class II Rock Riprap, unless otherwise specified.

305.34 3/4”-INCH CRUSHED AGGREGATE

Upon completion and approval of the subgrade preparation by the government, the 3/4”-inch crushed aggregate shall be placed and compacted on the prepared subgrade to the dimensions shown on the plans and graded to a tolerance of 0.05 feet. The location and method of placement shall be shown on the plans as embankment cap.

305.40 METHOD OF MEASUREMENT

Class II Rock Riprap and 3/4”-inch crushed aggregate placement shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Bid Schedule for the pay item corresponding to this specification number. Class II Rock Riprap and 3/4”-inch crushed aggregate placement shall be measured in the following manner:

1) Cubic Yards (CY): Class II Rock Riprap shall be measured on a volume basis of placed material.

Determination of quantities shall be based off of loose unit weight tests for each material as follows.

Contractor shall have a certified geotechnical laboratory perform the tests. Government to be present when conducting tests.

Loose Unit Weight Test: Test shall be performed using an end dump truck and certified scale. Prior to testing, the trucks are to be measured for volume and weighed for tare. Perform tests by placing the material (Class II Rock Riprap) in the end dump with front end loader, placing material with a straight edge in such a way that any projections of the larger pieces of the material approximately balance the larger voids in the surface below the top truck box. Weigh the truck at the certified scale to determine the unit weight of the material.

This test shall be conducted three times for each material and the average of the three tests shall be the unit weight of the material.

Determination of Quantities: After the unit weight tests have been performed for the Class II Rock Riprap, all material hauled to the project site shall be weighed at a certified scale and tickets given to the Contracting Officers Representative. Cubic yards delivered and placed will be calculated by dividing the total pounds delivered by the unit weight to give total yards delivered. No measurement shall be made for overbuild areas i.e.

𝐶𝑢𝑏𝑖𝑐 𝑌𝑎𝑟𝑑𝑠

2) Compacted Cubic Yards (CCY): 3/4”-inch crushed aggregate shall be measured and paid for by the cubic yard compacted in place for imported 3/4”-inch crushed aggregate material. Determination of quantities shall be as follows:

a) Loose Material hauled shall be weighed at a certified scale and tickets given to the Project Inspector.

b) Loose material hauled shall then be divided by the Loose Wet Density of the material to obtain the loose cubic yards delivered.

c) The loose cubic yards shall be divided by the Factor of 1.33 to obtain the Compacted yards in place.

Factor Derivation: 25 percent shall be used for shrink and loss, 20 percent for shrink and 5 percent for loss.

𝐹𝑎𝑐𝑡𝑜𝑟 100%

100% 25%

𝐹𝑎𝑐𝑡𝑜𝑟 1.33

305.50 METHOD OF PAYMENT

The completed work for Class II Rock Riprap and 3/4”-inch crushed aggregate placement, measured as specified, shall be paid for at the contract unit price. The unit price bid for Class II Rock Riprap and 3/4”-inch crushed aggregate placement shall include supplying all materials, equipment, labor, and any incidental items necessary for performing all Class II Rock Riprap and 3/4”-inch crushed aggregate installation operations described in this specification.

Item Spec. Bid

5 305 Class II Rock Riprap CY 1730.00

6 305 3/4”-Inch Crushed Aggregate CCY 482.00

7 305 Non-Woven Filter Fabric Roll 15

401 SOIL EROSION AND POLLUTION CONTROL

401.10 DESCRIPTION

The work shall include the supply of all labor, materials and equipment necessary for the construction and maintenance of erosion controls and to minimize the production of sediment and other pollutants to water and air during construction operations. It is the Contractor’s responsibility to adhere to all Local, State and Federal regulations regarding the control of soil erosion, sedimentation, and pollution. The work and measures may include but are not limited to the following as shown on the drawings or as specified herein.

a) Staging of Earthwork Activities - The excavation and moving of soil materials shall be scheduled so that the smallest possible areas will be unprotected from erosion for the shortest time feasible.

b) Diversions - Diversions shall be used to divert water away from work areas and/or to collect runoff from work areas for treatment and safe disposition.

c) Stream Crossings - Stream crossings shall be used where fording of streams by equipment is necessary.

Silt Fence - Silt fence shall be used to trap sediment from areas of limited runoff. Silt fence is temporary and shall be removed when permanent measures are installed.

d) Sediment Basins - Sediment basins shall be used to settle and filter out sediment from eroding areas to protect properties and streams below the construction site.

e) Filters – Rock and straw bale filters shall be used to trap sediment from areas of limited runoff. Straw bales are temporary and shall be removed when permanent measures are installed.

f) Waterways - Waterways shall be used for the safe disposal of runoff from fields, diversions and other structures or measures.

401.20 MATERIALS

401.21 SUPPLY OF MATERIALS

Unless otherwise specified, the Contractor will supply all materials necessary to complete the installation as shown on the plans or recommended by the material manufacturer.

Silt fences are intended to intercept and detain small amounts of sediment from disturbed areas in order to keep the sediment from leaving the site. The Contractor shall supply and install the silt fence as specified unless otherwise identified on the plans. Silt fence shall be installed on the contour and constructed so that flow cannot bypass the ends. It shall be buried at the base and cleaned of soil when appropriate.

Silt Fence TABLE 1. Specifications for Description Heavy Duty Standard

Geotextile

Type Woven Woven Width 48 inches 36 inches Grab Tensile Strength ASTM D4632 100 lb minimum 100 lb minimum Apparent Opening Size ASTM D4751

20-70 Sieve 20-70 Sieve

UV Stability USTM D4355 500 hr.

70% minimum 70% minimum

Top-fastening Component Overlap around Woven-wire backing

Sewn-in cord

Net Backing

Material Woven Wire or Plastic Mesh

Minimum Weight 14-1/2 gauge

Minimum Mesh Opening 2 inches

Maximum Mesh Opening 6 inches

Minimum Width 30 inches

Heavy Duty Standard Tensile Strength ASTM D4595 100 lb/ft

UV Stability ASTM D4355 500 hr. 70% minimum

Posts Material Metal Wood

Minimum Size 1.25 lb/ft 1½ in x 1½ in Minimum Length 5 feet 4 feet Minimum Embedment 2 feet 1.5 feet Maximum Spacing 8 feet 8 feet Type of Post Fasteners U-shaped clips

No. 16 gauge wire Gun staples

1.5 inch long

Min. Fasteners Per Post 3 5

401.30 CONSTRUCTION METHODS

401.31 GENERAL REQUIREMENTS

Construction operations shall be conducted in such a manner to reduce erosion and sedimentation to a practical minimum. Temporary or permanent controls shall be constructed to the extent possible prior to clearing and grubbing operations. Clearing and grubbing shall not be done until the area is needed in the construction operation.

The construction site shall be maintained in a clean and sanitary condition during construction operation. Trash barrels shall be provided at the site and periodically emptied. Installation of all controls shall be accomplished as specified on the plans or with the approval of the government in accordance with the manufacturer’s published recommended practice.

401.32 INCIDENTAL EROSION AND POLLUTION CONTROL ITEMS

These items shall consist of installing measures, supplying all materials and equipment, and performing all work to control erosion and minimize the production of sediment and other pollutants to the water and air during construction operations. Such measures shall include, but are not limited to, silt fences and other measures listed in this specification or deemed necessary by the government.

All state and local laws governing soil erosion and pollution control shall be followed. The government shall have sole authority in determining when pollution control measures are necessary, when pollution control measures are functioning properly, and when silt fences for this item of work are required.

With the exception of silt fence, the Contractor shall determine which soil erosion and pollution control measures to install, provided that the measures are in accordance with applicable laws. The Contractor shall maintain all soil erosion and pollution control measures.

Earth stockpiles shall be in the area dictated by the government and protected with silt fences to control runoff and erosion in such a manner as to minimize the production of sediment and other pollutants to the water during construction operations.

401.33 CHEMICAL POLLUTION

The Contractor shall provide tanks or barrels to be used to dispose of waste oils or other chemical pollutants produced as a by-product of the work under the contract, such as drained lubricating or transmission oils, greases, soaps, asphalt, etc. At the completion of the work, all storage tanks or barrels shall be removed and disposed of at the Contractor’s expense in accordance with all Local, State and Federal regulations.

Sanitary facilities shall not be placed adjacent to live streams, wells, or springs. They shall be located at a distance sufficient to prevent contamination of any water sources.

401.34 AIR POLLUTION

All Local, State and Federal regulations concerning the burning of brush or slash or disposal of other materials shall be adhered to. Fire prevention measures shall be taken to prevent the start or the spreading of fires that may result from any contract work.

All public access or haul roads used during construction of the project shall be watered or treated with dust palliative when necessary to control the dust raised by the hauling equipment.

401.35 MAINTENANCE, REMOVAL AND RESTORATION

All measures and works shall be adequately maintained in a functional condition as long as needed during the construction operation. Sediment shall be removed periodically or as directed by the government. Upon sediment removal, all trapped sediment from the controls must be disposed of in the spoil area as shown on the plans. All temporary measures shall be removed, and the site restored as nearly to original conditions as practicable as directed by the government. All temporary measures and materials become the property of the Contractor upon removal.

401.40 METHOD OF MEASUREMENT

Soil erosion and pollution control shall not be measured as this will be considered incidental to the construction process and will be expected to be included in overall construction estimate.

401.50 METHOD OF PAYMENT

No direct payment for work described under this section will be made. Contractor shall include consideration for this item in the bid price for other scheduled items of the contract.

402 TOPSOIL & SEEDING

402.10 DESCRIPTION

The work of this section shall include the supply of all labor, materials, equipment, and incidental items required to complete the seeding and mulching operations as shown on the plans or specified herein. This specification shall cover the preparation of areas to be seeded, furnishing, and placing required seed, fertilizer, and other materials necessary for the complete seeding of the areas of this project requiring the establishment of turf.

402.20 MATERIALS

402.21 TOPSOIL

Topsoil shall be composed of fertile, friable, free draining, sandy loam soil that is free of subsoil, refuse, stumps, roots, brush, weeds, rocks larger than 1 inch (25 millimeters), or other substances detrimental to the development of vegetative growth. Demonstrate that the soil can sustain healthy crops of grass, shrubs, or other plant growth. Conform to the following:

1) Texture

a) Organic matter, AASHTO T267 3.0 to 10.0 percent

b) Sand, AASHTO T88 20 to 70 percent

c) Silt, AASHTO T88 10 to 60 percent

d) Clay, AASHTO T88 5 to 30 percent

2) pH, AASHTO T289 6.0 to 8.0

402.22 SEED MIXTURE

Seed mixtures shall be composed of certified seed of the purity, germination, and proportions, by weight, in the proportions as follows:

Common Name Scientific Name& Symbol Broadcast Seeding Rate1

Great Basin Wildrye Elymus cinereus LECI4 5 lb/ac ‘Sodar’ Streambank Wheatgrass Elymus lanceolatus 5 lb/ac

Lewis Flax Linum lewisii LILE3 1 lb/ac Sulfer Buckwheat Eriogonum umbellatum ERUM ½ lb/ac Goosberryleaf Globemallow2 Sphaeralcea grossulariifolia SPGR2 ½ lb/ac Scarlet Globemallow2 Sphaeralcea coccinea SPCO ½ lb/ac

Total seeding rate: 12 lbs/ac 1 Seeding rate is for Pure Live Seed 2 Add at least one or both of these to the mix depending on availability

Seed shall be furnished separately or in mixture in standard, sealed containers with (1) seed name; (2) lot number;

(3) net weight; (4) percentages of purity and of germination and (5) percentage of maximum weed seed content clearly marked for each kind of seed. The Contractor shall furnish the Owner duplicate signed copies of a statement by the vendor, certifying that each lot of seed has been tested by a qualified laboratory for seed testing within six months of date of delivery.

402.23 MULCHING MATERIAL

Straw or excelsior mulches shall be of an approved material. Devices used to hold the net in place shall be of the material and design specified on the plans or approved by the Engineer.

402.24 EROSION CONTROL BLANKET

The short-term single net erosion control blanket shall be a mat of 100% agricultural straw with a functional longevity of up to 12 months. The blanket shall be of consistent thickness with the straw evenly distributed over the entire area of the mat. The blanket shall be covered on the top side with a 100% biodegradable woven natural organic fiber net. Erosion control matting as per S75BN - North American Green, or an approved equal. Each roll shall contain at least 80 square yards of matting material.

402.25 LANDSCAPE STAPLES

Contractor to provide 6-inch, U-shaped 11-gauge wire staples as used in installing erosion control matting. A staple pattern shall be given to the Contractor at the pre-work conference for varying slopes. Contractor may be permitted to use 60d nail with fender washer in place of landscape staple where areas of rocky terrain slopes exist, if prior approval from the Contracting Officer Representative is granted. Refer to drawing page C12 – EROSION CONTROL BLANKET for minimum staple/nail spacing.

402.30 CONSTRUCTION METHODS

402.31 SEEDING SEASON

The Contractor shall obtain the permission of the Government to proceed with a dormant seeding during the late fall.

If fall dormant seeding is not approved, the Contractor shall complete all seeding the following spring prior to June 15.

402.32 PLACING TOPSOIL

Provide at least seven days notice before the start of topsoil placement. Do not place topsoil when the ground or topsoil is frozen, excessively wet, or otherwise in a condition detrimental to the work. Use conserved topsoil before furnishing topsoil. Keep the roadway surfaces clean during hauling and spreading operations. Spread topsoil to a depth that after settlement, provides the required depth. Break clods and lumps with harrows, disks, or other appropriate equipment to provide a uniform textured soil. Remove and dispose of clods and stones larger than 2 inches (50 millimeters), stumps, roots, and other litter. Construct longitudinal depressions at least 2 inches (50 millimeters) deep perpendicular to the natural flow of water without overly compacting the topsoil surface.

402.33 SOIL PREPARATION

Areas to be seeded that have been damaged by erosion shall be restored prior to seeding. All areas to be seeded shall be finished to the grades shown on the plans, plus 6" for topsoil thickness, and then cultivated to provide a reasonably firm, but friable seedbed, free of lumps and clods detrimental to seeding operations. A minimum of 1 inch of surface soil shall be in a loose condition. Shape slopes and disturbed areas to be covered with topsoil. Disk or scarify slopes 1V:3H or flatter to a depth of 4 inches (100 millimeters) perpendicular to the natural flow of water. Upon completion of construction operations remove rock, debris, and clods that are 3 inches in diameter or larger within the seeded areas.

402.34 TOPSOIL

Spread to a depth of 6 inches over areas to be seeded. Place topsoil during dry weather, and on dry unfrozen subgrade.

402.35 NATIVE SEED

Shall be applied to designated areas during the frost-free period between the spring and fall, unless otherwise approved in writing by the Contracting Officer. The Contractor shall protect seeded areas from damage caused by traffic or construction equipment. Areas damaged from these activities shall be repaired at the Contractor’s expense.

1. Contractor shall apply seed mix and mulch using hydroseeding method.

2. Contractor shall ensure complete coverage of top soiled areas

Contractor: DO NOT ADD FERTILIZER TO THE SEED MIX!

a. Mix native seed mix in water with a nonasphaltic tackifier using equipment specifically designed for hydroseeding applications. Continue mixing until uniformly blended into a homogenous slurry suitable for hydraulic application.

b. Apply the slurry seed mix uniformly to all areas to be seeded. Apply the seed mix at a minimum rate of 12 lbs per acre.

402.36 WORKMANSHIP AND MATERIALS

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

402.37 CARE DURING CONSTRUCTION

The Contractor shall be responsible for protecting and caring for seeded areas until acceptance of the work. The Contractor shall repair any damage to seeded areas caused by construction operations without additional compensation.

402.40 METHOD OF MEASUREMENT

Topsoil shall be measured on a unit basis. The unit shall be shown in the Unit Price Table of the Bid Schedule for the pay item corresponding to this specification number. No measurement for topsoil beyond the staked limits will be made. Topsoil shall be measured in the following manner:

1) Cubic Yards (CY): Topsoil shall be measured on a volume basis of placed soil. The volume to be paid for shall be made by cross sectioning designated borrow areas minus embankment quantities and using the average end method of volume calculation. No measurement shall be made for overbuild areas.

Seeding shall be considered incidental to the excavation, embankment and erosion control operations and no measurement shall be made.