Amendment 0003 - Amendment Summary AM01_20210831.pdf

SOLICIATION NO. W91238-B-21-0011

1 of 1 Amendment 01

YOLO COUNTY, CALIFORNIA

PL 84-99 WEST LEVEE OF YOLO BYPASS

REPAIR SITE 0412-28

AMENDMENT 01 - SUMMARY:

A) SPECIFICATION 2220

1) Replaced entire Project Table of Contents.

2) Replaced entire Section 32 93 33.

B) DRAWINGS

1). Replaced C-101.

2). Replaced C-302.

3). Replaced C-303.

C) PRICE SCHEDULE

1). Replaced entire Bid Schedule.

PL 84-99 Site 0412-28 2220

PROJECT TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 00 00 GENERAL REQUIREMENTS

01 22 00 PRICE AND PAYMENT PROCEDURES

01 32 01 PROJECT SCHEDULE

01 33 00 SUBMITTAL PROCEDURES

01 35 26 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00 QUALITY CONTROL

01 45 00.15 RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

01 50 00 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS

01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL

01 71 10 MOBILIZATION AND DEMOBILIZATION

01 78 00 CLOSEOUT SUBMITTALS

DIVISION 31 - EARTHWORK

31 00 00 EARTHWORK

31 23 23 CONTROLLED LOW STRENGTH MATERIAL (CLSM)

DIVISION 32 - EXTERIOR IMPROVEMENTS

32 92 33 GRASS SEEDING AND EROSION CONTROL

DIVISION 33 - UTILITIES

33 40 00 STORM DRAINAGE UTILITIES

-- End of Project Table of Contents --

PROJECT TABLE OF CONTENTS Page 1

AM01_FOR CONSTRUCTION

SECTION TABLE OF CONTENTS

DIVISION 32 - EXTERIOR IMPROVEMENTS

SECTION 32 92 33

GRASS SEEDING AND EROSION CONTROL

PART 1 GENERAL

1.1 DESCRIPTION

1.2 REFERENCES

1.3 PERFORMANCE STANDARDS

1.3.1 Grass Performance Standards

1.4 SUBMITTALS

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

1.5.2 Storage

1.5.3 Handling

1.6 TIMES AND CONDITIONS

1.6.1 Grass Seeding Times

1.6.2 Grass Seeding Conditions

1.7 WARRANTY

1.8 INSTALLER'S QUALIFICATION

PART 2 PRODUCTS

2.1 EQUIPMENT

2.2 BACKFILL SOIL AND TOPSOIL

2.2.1 Topsoil

2.3 GRASS SEED

2.3.1 Seed Classification

2.3.2 Seed Quality

2.3.3 Seed Species and Seeding Rate

2.3.4 Seed Mixing

2.3.5 Substitutions

2.4 WOOD FIBER MULCH

2.5 FERTILIZER

2.6 TACKIFIER

2.7 STRAW MULCH

2.8 BONDED FIBER MATRIX

2.9 STRAW WATTLES

2.10 WOODEN STAKES

2.11 ROLLED EROSION CONTROL PRODUCTS

2.11.1 ECTC Type 2.D RECP

2.11.2 ECTC Type 3.B RECP

2.11.3 ECTC Type 4 RECP

2.11.4 ECTC Type 5.A RECP

2.12 COIR FIBER ROLLS

2.13 TESTS, INSPECTIONS, AND VERIFICATIONS

2.13.1 Seeding Operations

2.13.1.1 Inspection of Seed, Equipment and Quantities

2.13.1.2 Inspection of Seeding Operation

2.13.1.3 Inspection of Seed Growth and Establishment

SECTION 32 92 33 Page 1

2.13.1.4 Seeding Acceptance

2.13.2 RECP and Straw Wattle Operations

2.13.3 Straw Mulching Operations

PART 3 EXECUTION

3.1 APPLICATIONS

3.1.1 Canals and Ditch Applications

3.2 LAYOUT

3.3 SOIL PREPARATION

3.4 TRENCHING

3.5 SEEDING AND MULCHING

3.5.1 Seed Application Method

3.5.1.1 Hydroseeding with Wood Fiber Mulch

3.5.1.2 Broadcast Seeding

3.5.1.3 Drill Seeding

3.5.2 Applying Straw Mulch

3.5.3 Applying Tackifier

3.5.3.1 Crimping or Punching Straw

3.5.4 Hydroseeding with Bonded Fiber Matrix

3.6 INSTALLING STRAW WATTLES AND COIR ROLLS

3.7 INSTALLING ROLLED EROSION CONTROL PRODUCTS

3.8 INSTALLING CHECK DAMS

3.9 REPAIRING OF DAMAGED OR UNSUCCESSFUL GRASS STANDS

3.10 ESTABLISHMENT

3.10.1 Grass Establishment Period

3.10.2 Protection

3.11 CLEANUP

-- End of Section Table of Contents --

SECTION 32 92 33 Page 2

SECTION 32 92 33

GRASS SEEDING AND EROSION CONTROL

PART 1 GENERAL

1.1 DESCRIPTION

The work covered in this section consists of furnishing all material, equipment and labor for the seeding of grass and installation of erosion control material for long-term soil stability. This specification addresses the work required to provide grass seed on all newly worked, damaged, bare and disturbed soil within the project limits of work. It is the intent of this specification to protect all exposed soil with mature grass. Where establishing grass is not possible, or is not achieved, provide long-term sediment and erosion control materials.

Provide long-term erosion control measures and materials to ensure soil does not erode during inclement weather and migrate during grass establishment. Provide soil protection for a period of time from Contract award until grass is established. If grass is not established by 1 October, provide erosion and sediment control materials until grass has successfully established. In addition to the temporary storm water pollution control measures required in specification Section 01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL, provide long-term protection using grass seeding and erosion and sediment control measures and materials.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D4355/D4355M (2014) Deterioration of Geotextiles from Exposure to Light, Moisture and Heat in a Xenon-Arc Type Apparatus

ASTM D6525/D6525M (2016) Standard Test Method for Measuring Nominal Thickness of Rolled Erosion Control Products

CALIFORNIA DEPARTMENT OF FOOD AND AGRICULTURE (CDFA)

CDFA Guide 5101 and 5205 Guidelines under California Food and Agriculture Code Section 5101 and 5205 For The Certification Of Weed Free Forage, Hay, Straw And Mulch

TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY (TAPPI)

TAPPI T413 OM (2002) Ash in Wood, Pulp, Paper and Paperboard: Combustion at 900 Degrees Celsius

SECTION 32 92 33 Page 3

U.S. DEPARTMENT OF AGRICULTURE (USDA)

AMS Seed Act (1940; R 1988; R 1998) Federal Seed Act

1.3 PERFORMANCE STANDARDS

1.3.1 Grass Performance Standards

The successful establishment of grass on all newly graded, bare, disturbed, or damaged soil is the ultimate long-term goal of the requirements indicated herein. If at the end of the Contract the grass performance standard has not been met, complete the installation of appropriate long-term erosion control materials that protect and stabilize the soil.

Evaluate grass plants for species and health when the grass plants are a minimum 1-inch high. The successful establishment of grass is defined as having a minimum of 144 grass plants per square foot. The total bare soil areas, or substandard areas (those areas with less than 144 grass plants per square foot) must not exceed two percent of the total seeded area.

Total native grass species must exceed seventy-five percent coverage of total seeded area.

Provide erosion control so that no erosive characteristics exists on site.

If there are erosion reels, ruts, gullies, or other types of erosion occurring, repair these areas, reseed them, and provide appropriate long-term erosion control materials, such as, RECPs, wattles, etc. to correct the problem.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Fertilizer; G

Straw Mulch; G

Tackifier; G

Grass Seed; G

Wood Fiber; G

Straw Wattles; G

Equipment; G

SD-07 Certificates

Installer's Qualification; G

SECTION 32 92 33 Page 4

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

Perform preparation for shipment in a manner that will not damage seeds, pesticides and all other material. Protect seeds, pesticides and all other material from weather and contamination during delivery. Furnish RECP and fiber rolls in rolls with suitable wrapping to protect against moisture and extended ultraviolet exposure prior to placement. Label RECP and fiber rolls to provide identification sufficient for inventory and quality control purposes.

1.5.2 Storage

Store material in areas approved by the Contracting Officer. Store seed in cool, dry locations out of direct sunlight and away from contaminants.

Do not store chemical and pesticide material with other landscape materials and store in a spillage contained area. Keep mulch covered and protected from rain.

1.5.3 Handling

Except for bulk deliveries, do not drop our dump material from trucks.

1.6 TIMES AND CONDITIONS

1.6.1 Grass Seeding Times

Submit an erosion and sediment control plan for approval. Provide grass seed to all worked, damaged, bare and disturbed soil for long-term stability. If possible, provide seeding prior to 1 October with a sufficient amount of time for the grass to mature. Where it is not possible or practical to seed and establish an acceptable stand of grass by 1 October, provide temporary erosion and sediment control measures to all worked, bare and disturbed soil so that the soil is adequately protected while the grass is maturing. See specification Section 01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL for specific requirements. A desirable stand of grass is as indicated herein in the paragraph titled Grass Performance Standards. No variance to the start date will be allowed unless given in writing by the Contracting Officer.

Provide all long-term erosion and sediment control measures in-place.

Long-term erosion control is defined as having an established stand of grass that meets the performance standards and is capable of protecting the soil against an average yearly rainfall. Where the grass is not yet established by the end of the Contract, provide long-term erosion and sediment control blankets and wattles. Submit erosion and sediment control plan defining areas to receive recommended materials as required by federal, state or local regulations.

1.6.2 Grass Seeding Conditions

Perform seeding operations only during periods when beneficial results can be obtained. Stop work when excessive moisture, winds or other unsatisfactory conditions prevail, when directed by the Contracting Officer. If the seeding schedule calls for installation when the temperature is expected to exceed 90 degrees Fahrenheit, schedule planting in the mornings to avoid stressing plants during seeding. When special conditions warrant a variance to the planting operations, submit a proposed

SECTION 32 92 33 Page 5 seeding time in writing for approval by the Contracting Officer. Prepare to seed at the earliest time when all conditions (weather, moisture, temperature, tides and river flows, etc.) are acceptable.

1.7 WARRANTY

All equipment and material used must meet all State and local codes and regulations and guaranteed to function properly for the duration of the Contract period.

1.8 INSTALLER'S QUALIFICATION

Submit the installer's company name and address; training and experience and/or certification.

PART 2 PRODUCTS

2.1 EQUIPMENT

Submit a list of equipment used for the application of erosion control materials.

2.2 BACKFILL SOIL AND TOPSOIL

For levee fill, refer to Section31 00 00 EARTHWORK.

2.2.1 Topsoil

Material suitable for topsoils obtained from offsite areas is defined as:

Natural, friable soil representative of productive, well-drained soils in the area, free of subsoil, stumps, rocks larger than one inch diameter, brush, weeds, toxic substances, and other material detrimental to plant growth. Amend topsoil pH range to obtain a pH of 5.5 to 7.

2.3 GRASS SEED

Provide seed for the species, at the quantity, and rate as specified below.

2.3.1 Seed Classification

Provide State-certified seed mix of the latest season's crop in original sealed packages bearing the producer's guaranteed analysis for percentages of mixture, purity, germination, hard seed, weed seed content, and inert material. All labels must conform to the AMS Seed Act and applicable State seed laws. Include classification, botanical name, common name, percent pure live seed, minimum percent germination and hard seed, maximum percent weed seed content, and date tested.

2.3.2 Seed Quality

Weed seed must not exceed one percent by weight of the total of each species. Reject and remove wet, moldy, insect infested or otherwise damaged seed from project site. Reject and remove open containers of seed or improperly tagged containers from project site.

2.3.3 Seed Species and Seeding Rate

Provide seed species at the quantity and rate as specified below. The table below indicates rates for the pounds of pure live seed (PLS) required.

SECTION 32 92 33 Page 6

TABLE A1 - GRASS SEED MIXTURE

Botanical Name Common Name Pounds PLS per Acre

Broadcast and Hydroseeding

Drill Seeding

Bromus carinatus California brome 10 7

Hordeum brachyantherum

Meadow barley 10 5

Leymus triticoides Creeping wildrye 10 5

Vulpia microstachys

Small fescue 15 5

Poa secunda Pine bluegrass 4 2

Nassella pulchra Purple needlegrass 4 2

Trifolium willdenovii

Tomcat clover * 5 3

Eschscholzia california

California poppy 2 1

TOTAL SEED MIXTURE 60 30

*Inoculate Tomcat clover. The seeding rate shown reflects the weight of seed without the inoculums. Apply inoculants at a rate of 2 lbs of inoculants per 100 lbs of seed.

2.3.4 Seed Mixing

Perform seed mixing in the presence of the Contracting Officer.

2.3.5 Substitutions

No substitutions without a written request and approval from the Contracting Officer.

2.4 WOOD FIBER MULCH

Use commercially available wood fiber mulch produced from 100 percent virgin wood fiber. Use fiber that disperses uniformly into the slurry when mixed with water. The water content of the fiber before mixing into the slurry must not exceed 15 percent of the dry weight of the fiber. Provide a clearly marked fiber moisture content on the package. Do not use corrugated cardboard, recycled newspaper, or a combination of recycled newspaper and wood fiber.

Provide fiber that does not contain more than 7 percent ash as determined by TAPPI T413 OM, and is nontoxic to plant or animal life.

SECTION 32 92 33 Page 7

Provide fiber must have a water-holding capacity by weight of not less than 1,100 percent. Water-holding capacity of the fiber must be clearly marked on the package.

Provide a colored fiber to contrast the area on which the fiber is to be applied, and is nontoxic to plant and animal life and does not stain concrete or painted surfaces.

2.5 FERTILIZER

Fertilizer must be controlled release commercial grade, free flowing, uniform in composition and conforming to CID A-A-1909. Granular ammonium-phosphate-sulfate fertilizer consisting of: 16 percent nitrogen, 16 percent phosphorus, and 16 percent potassium.

2.6 TACKIFIER

Provide a concentrated, biodegradable and organic derivative tackifier of the Plantago plant (Plantago insularis) that is non-toxic to plant and animal life, non-corrosive, and non-crystalline and be non-staining to concrete or painted surfaces.

2.7 STRAW MULCH

Use straw stalks from, in order of preference: native grasses, wheat, barley, or rice furnished in air-dry condition and with a consistency for placing with commercial mulch blowing equipment. Do not use wheat or barley straw, if used that is derived from dry farmed cereal crops.

Certify all straw as weed-free.

2.8 BONDED FIBER MATRIX

Provide Bonded Fiber Matrix (BFM) manufactured to be hydraulically applied, and upon drying, adheres to the soil in the form of a continuous, 100 percent coverage, biodegradable, erosion control blanket. It must not negatively affect the germination and development of grass seed. Provide a BFM that is comprised of long strand, thermally produced wood fibers passing a freeness test. Conform to the following standards and minimum values.

Provide a BFM that has the following properties and characteristics:

1. Materials: Wood fiber, Polysaccharide crosslinked hydro-colloid polymer tackifier, dark green dye.

2. pH Range: 4.8 plus or minus 2.

3. Moisture Content: 12+-3% percent maximum.

4. Wood Fiber Content: 90 percent maximum.

5. Polysaccharide Crosslinked Hydro-colloid Polymer Tackifier: 10+-1%

6. Organic Content: 99 percent, plus or minus 1.

7. Ash Content: 1 percent, plus or minus 1.

8. Water Holding Capacity: 1,350 percent minimum.

9. Fiber Mulch Slurry Viscosity: Minimum 2.85 cps (Test Method: Falling

Ball Viscometer) Test condition 1500 lbs of fiber mulch per 3000 gallons of water, evaluated immediately after mixing.

10. Packaging: 50 pound UV resistant bags, with UV resistant pallet cover.

SECTION 32 92 33 Page 8

2.9 STRAW WATTLES

Provide manufacturers literature with current factual information as to the manufacturers and suppliers classifications, including physical characteristics, application and installation instructions. Certify Straw wattles are machine-produced tube 9 inch diameter, plus or minus 1 inch, and 100 percent rice straw-filled tube of flexible netting. Provide straw wattles of compacted rice straw that is Certified Weed Free Forage under CDFA Guide 5101 and 5205. Provide netting must be of 100 percent natural fiber biodegradable netting. Nine inch diameter, 100 percent coir fiber rolls, with natural fiber biodegradable netting, may be substituted in place of straw rolls. Photodegradable plastic netting is not acceptable.

Provide wattles or rolls that have a functional longevity of a minimum of 12 months.

2.10 WOODEN STAKES

Provide wooden stakes of Douglas fir or pine at 1 inch x 2 inch . Provide stakes that are 18-inches long. Drive the stakes in until refusal and capable of securely holding material in place. Do not pound stakes so that the wood splits.

2.11 ROLLED EROSION CONTROL PRODUCTS

Provide rolled erosion control products (RECP) of the following types and as designated by the Erosion Control Technology Council (ECTC). Stitched blankets with single side netting are not acceptable or permitted for use on this project. Use 100 percent natural biodegradable netting or woven fabrics in all areas requiring RECP within 100 feet of a wetland or sensitive habitat. Photodegradable polypropylene nettings are not permitted.

2.11.1 ECTC Type 2.D RECP

For ECTC Type 2.D RECP provide ECTC Type 2.D stitched straw blankets manufactured from 100 percent biodegradable, natural fiber top and bottom netting. Provide blankets that have a functional longevity of 12 months for providing erosion protection and mulching. Conform to the following standards and values.

- Manufacturer's slope recommendation: 3H:1V

- C Factor: less or equal to 0.20 @ 2:1

- Tensile strength: 75 lbs/ft

- Shear stress: 1.75 lbs/sq ft., min

2.11.2 ECTC Type 3.B RECP

For ECTC Type 3.B RECPs provide either of the following:

a. Jute woven fabric must be 100 percent biodegradable open weave jute material with 1" openings. It must have a weight of 16 ounces (plus or minus 2 oz) per square yard. Its tensile strength must be roughly 300 x 175 lbs per foot dry with an open area of 60-70 percent. It must have a minimum 2-year effective life and be brown or earth tone in color.

b. Provide stitched straw-coir blankets manufactured from 70 percent straw and 30 percent coconut fiber matrix sewn between two 100 percent

SECTION 32 92 33 Page 9 biodegradable natural fiber top and bottom netting with a functional longevity of 18-24 months. Conform to the following standards and minimum values.

- Manufacturer's slope recommendation: 2H:1V

- C Factor: less or equal to 0.25 @ 1.5:1

- Tensile strength: 100 lbs/ft

- Shear stress: 2.00 lbs/sq ft., min

2.11.3 ECTC Type 4 RECP

For ECTC Type 4 RECPs provide either of the following:

a. Coir woven fabric must be 100 percent biodegradable open weave coir material with a non-shifting square mesh in both the warp and the weft. It must have a weight of 12 ounces (plus or minus 2 oz) per square yard. Its open area of the fabric must be 65 percent (plus or minus 2 percent). It must have a minimum 3-year effective life and be brown or earth tone in color. It must conform to the manufacturer's recommendations for 3H:1V slopes.

b. Provide stitched coir blankets must be manufactured from 100 percent coconut fiber matrix sewn between two 100 percent biodegradable natural fiber top and bottom netting. Provide blankets that have a functional longevity of 36 months. Conform to the following standards and minimum values.

- Manufacturer's slope recommendation: 1H:1V

- C Factor: less or equal to 0.25 @ 1:1

- Tensile strength: 125 lbs/ft

- Shear stress: 2.25 lbs/sq ft., min

2.11.4 ECTC Type 5.A RECP

Turf Reinforcement Mat (TRM) must be a rolled erosion control product composed of non-degradable synthetic fibers, filaments, nets, wire mesh and/or other elements, processed into a permanent, three-dimensional matrix with a thickness of 0.25 inches per ASTM D6525/D6525M and U.V. stability of 80 percent per ASTM D4355/D4355M. It must conform to the manufacturer's recommendations for 0.5H:1V slopes; have a tensile strength of 1.25 lbs/ft;

and have a shear stress of 6.0 lbs/sq ft, min.

2.12 COIR FIBER ROLLS

Provide coir fiber rolls made from 100 percent coconut (coir) fiber and bound by 100 percent high-strength coir natural fiber netting. Provide rolls that have a diameter of 12 inches (plus or minus one inch), or as indicated on the drawings. Conform to the following standards and minimum values. Provide netting mesh opening that is 2 inch x 2 inch. For 12 inch diameter rolls, certify the netting strength at 90 lbs with its density at

3.5 lbs per cubic feet. Provide rolls that have a mass per unit area of

2.6 lbs per foot, with a functional longevity of 24 months.

2.13 TESTS, INSPECTIONS, AND VERIFICATIONS

Notify the Contracting Officer at least 5 days prior to each anticipated inspection. The Contracting Officer may at anytime inspect work without notification. The following are key inspection events:

SECTION 32 92 33 Page 10

2.13.1 Seeding Operations

2.13.1.1 Inspection of Seed, Equipment and Quantities

Seed suppliers are subject to inspection of methods, materials, and processing. Provide supplier names and addresses upon award of Contract.

Seed will be inspected upon arrival at the job site by the Contracting Officer for conformity to species and quality in accordance with paragraph titled GRASS SEED.

- Upon Arrival at the Site: Provide receipts of the seed purchased and delivered to the site. Provide name of company on the receipts from which the seed was purchased, seed species, composition, quantity, germination rate, and pure-live-seed percentage. Inspect other material to ensure it meets specified requirements. Remove unacceptable materials from the job site and replace.

- Calibration Test: Adjust and calibrate equipment as per manufacturer's specifications and field test in the presence of the Contracting Officer, immediately prior to commencement of seeding operations.

2.13.1.2 Inspection of Seeding Operation

The Contracting Officer will inspect the seeding operation during equipment calibration, material loading and seed application.

2.13.1.3 Inspection of Seed Growth and Establishment

Regularly observe the progress of seed growth between 1 October and 1 May of each year of the Contract period, and take steps to reseed and protect all bare, disturbed and damaged soil areas that do not meet the grass performance standards or that exhibit erosion. Repair, reseed and protect all areas, without active construction activities, that do not meet the standards within 5 working days of discovery.

2.13.1.4 Seeding Acceptance

The Contracting Officer will hold a final inspection to determine any deficiencies in work after completion of seeding operations.

Preliminary Seeding Inspection: The Contracting Officer will hold a preliminary seeding inspection prior to the completion of the seeding.

Request time for the inspection in writing at least 5 working days prior to the desired date. The quantity and type of species seeded, clean up requirements and the acceptability of the seeding operation, in accordance with the requirements stated herein, will be determined and noted in writing.

Final Seeding Inspection: Request time for the final inspection in writing at least 5 working days prior to the desired date. At the final seeding inspection, the Contracting Officer will evaluate the deficiencies noted in the preliminary seeding inspection, to ensure they have been corrected.

2.13.2 RECP and Straw Wattle Operations

Request time for an inspection in writing at least 5 working days prior to the desired date. Request the inspection after trenching, and after RECP and straw wattles have been installed.

SECTION 32 92 33 Page 11

2.13.3 Straw Mulching Operations

Request time for an inspection in writing at least 5 working days prior to the desired date. Request the inspection after straw mulch has been applied, tackified or crimped.

PART 3 EXECUTION

3.1 APPLICATIONS

Perform seeding, mulching and erosion and sediment control as indicated herein. Apply seeding and mulching to all disturbed, damaged, and bare soil within the project boundary, and reseed and protect any project disturbed, or impacted, soil outside of the project boundary. Where the requirements indicated herein conflict with specification Section 01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL, apply the greater requirement.

3.1.1 Canals and Ditch Applications

Protect canals and ditches with RECP and grass seeding. Line the bottom of high-flow canals (water velocity of 8 fps or greater) with ECTC Type 4 RECPs. If the grass is not established by 1 October on low-flow canals (water velocity of less than 8 fps), provide ECTC Type 3.B RECP on canal and ditch surfaces. Provide check dams as indicated herein.

Space check dams in all canals and ditches at the following distances, as measured in the direction of flow:

- On 2:1 gradients: 15 feet o.c.

- On 3:1 gradients: 20 feet o.c.

- On 4:1 gradients: 25 feet o.c.

- On 6:1 gradients: 40 feet o.c.

- On 10:1 gradients: 60 feet o.c.

- On 20:1 gradients: 100 feet o.c.

3.2 LAYOUT

Define the boundaries and location of all areas which require grass seeding, as per specifications and drawings.

3.3 SOIL PREPARATION

Till soil to a depth of four to six inches. Rake to remove any rocks and obstructions that prohibits the application of seed, straw wattles or RECPs from coming in direct continuous contact with the soil surface. Perform finish grading to ensure the designated areas and slopes are configured as per grades and drawings. Spray the proposed seeding area with a contact herbicide at least two weeks prior to seeding. Roll lightly, but do not compact to more than 85 percent density. Immediately prior to seeding, rake lightly to break up the upper crust so that the seeds have an excellent chance to bond with the soil.

For all levee slope areas and slopes where seed may be washed off, vertically track-walk the finished grade with a tracked bulldozer; forming horizontal troughs and ridges that are perpendicular to the water flow line and are capable of trapping seed and water.

SECTION 32 92 33 Page 12

3.4 TRENCHING

Where straw wattles are to be placed, dig a 3 inch deep trench sized to insure the wattles are in continuous contact with the soil along its entire length. Where RECP and TRMs are to be placed, trench all upper, lower and side edges as per manufacturer's recommendations.

3.5 SEEDING AND MULCHING

Seed all designated, bare and disturbed soil with grass seed after soil preparation and trenching have been performed and prior to placement of RECP, straw wattles, fiber rolls, TRMs, 3-D monofilament matrixes, or other erosion or sediment control materials. Prior to seeding, rework any previously prepared seedbed areas compacted or damaged by interim rain, traffic or other cause, to restore the ground for optimum seedbed conditions.

3.5.1 Seed Application Method

Seed all areas that have a 3H:1V or less slope using the drill seeding method. Seed areas that have a greater than 3H:1V slope using the hydroseeding method. Broadcast seed in areas that cannot be effectively drill seeded or hydroseeded. Upon arrival at the site, and prior to seeding, provide the Contracting Officer with receipts of the seed purchased and delivered to the site. Provide name of company on the receipts from which the seed was purchased, seed species, composition, quantity, germination rate, and pure-live-seed in pounds.

3.5.1.1 Hydroseeding with Wood Fiber Mulch

Hydroseed seed species by thoroughly mixing to ensure a seeding rate as specified under paragraph SEED SPECIES AND SEEDING RATES. Add wood fiber mulch to the mixture after the water and other mixture components have been thoroughly provided and mixed to produce a homogeneous slurry. Provide slurry with proper consistency to adhere to the earth slopes without lumping or running. The maximum time period for the seed to be held in the slurry is 24 hours. Uniformly apply slurry under pressure over the entire designated area. Do not roll the hydroseeded area.

When hydroseeding slopes, apply the seed from both above and below the slopes to ensure 100 percent of the soil surface has been seeded. Employ the following two-step process when hydroseeding:

Step 1: Apply the first step as a complete mixture, 1/2 of the mixture from one direction and the second half from the opposite direction, as indicated below:

- Wood Fiber Mulch, at a rate of 500 lbs per acre

- Seed Mix, as specified for species and seeding rate

- Do not apply fertilizer

Step 2: Apply the second step from two directions, at least 90 degrees from the first half. Apply as a complete mixture as indicated below:

- Wood Fiber Mulch, apply at a rate of 1,500 lbs per acre in this second step process.

- Tackifier, at a rate of 100 lbs per acre.

3.5.1.2 Broadcast Seeding

Broadcast seed uniformly using mechanical broadcast seeders at the rate as

SECTION 32 92 33 Page 13 specified under paragraph SEED SPECIES AND SEEDING RATES. Broadcast half of seed in one direction, and the remainder at right angles to the first direction. Cover seed to an average depth of 1/4 inch by harrowing with steel mat or chain drag, cultipacker, or other approved device. For slopes steeper than 2H:1V or inaccessible areas, hand broadcasting may be required and harrow or hand raking where practical.

Broadcast at the following rates:

- Seed mix as specified for species and seeding rate

- Do not apply fertilizer

3.5.1.3 Drill Seeding

Drill seed uniformly to a maximum 1/2 inch depth, using equipment having drills or disks spaced a maximum 7 inches apart. Use row markers with the drill seeder. Maintain the drilling equipment with half full seed boxes during the seeding operations. Adjust and calibrate equipment to manufacturer's specifications at the job site prior to seeding, and field test equipment in the presence of the Contracting Officer.

Drill seed at the seeding rate indicated in Table A1 - Grass Seed Mixture.

Do not apply fertilizer.

3.5.2 Applying Straw Mulch

Apply straw mulch over all broadcast-applied and drill seeded areas upon completion and approval by the Contracting Officer of the seeding application. Straw mulch is not required on those slopes that have been hydroseeded with wood fiber or are installed with RECP or open woven fabrics.

Spread mulch by hand, blower type mulch spreader or other approved method.

Start mulching on the windward side of relatively flat areas or on the upper part of a steep slope and continued uniformly until the area is covered. Apply the mulch loose and not bunched. Spread mulch evenly so that it completely covers the soil, with no visual soil being seen. Mulch all seeded areas within 48 hours of seeding.

Apply straw mulch at the following application rates:

- Apply straw mulch at 2,000 lbs per acre on drill or broadcast seeded surfaces.

- Apply straw mulch at 1,000 lbs per acre on all hydroseeded areas.

3.5.3 Applying Tackifier

For hydroseeded areas, tackify straw mulch with a commercially available dyed organic tackifier. Apply at a rate of 100 pounds per acre.

3.5.3.1 Crimping or Punching Straw

As a substitute for tackifying, mechanically crimp or punch all straw mulch areas into soil.

3.5.4 Hydroseeding with Bonded Fiber Matrix

Apply the Bonded Fiber Matrix (BFM) to all areas that are greater than a 1:4 slope that have erosive soils and where seeding with wood fiber mulch, straw mulch, or RECP cannot be successfully installed. Provide the BFM by a

SECTION 32 92 33 Page 14

Contractor certified by the manufacturer to be trained in the proper procedures for mixing and application of the product.

Mix the BFM according to the manufacturer's recommendations and demonstrate "free liquid" test to the Contracting Officer upon request. Spray-apply Bonded Fiber Matrix utilizing standard hydraulically seeding equipment in successive layers as to achieve 100 percent coverage of all exposed soil.

Do not apply the BFM immediately before, during or after rainfall, such that the matrix will have opportunity to dry for up to 24 hours after installation.

Employ the following one-step hydroseeding process when using BFMs. Apply as a complete mixture as indicated below:

Hydroseed application Rate: Add 30-50 pound of BFM fiber per 100 gallons of water when hydroseeding; confirm loading rates with equipment manufacturer.

a. 4 and 3 to 1 Slope: 3000 pounds per acre.

b. 2 to 1 slope: 3500 pounds per acre

c. Greater than 1 to 1 Slope: 4000 pounds per acre

3.6 INSTALLING STRAW WATTLES AND COIR ROLLS

After all soil treatment has been installed, including: seeding, straw mulch, erosion control blankets, fabric, TRMs or BFMs; place and secure straw wattles in pre-dug trenches. Extend the straw wattles continuously across the treatment area and provide continuous contact with the soil surface along its entire length. Place the straw wattle so that it is on contour along its entire length and anchored using wooden stakes spaced along its length at 48 inch intervals, maximum, and within 12 inches of both ends. Tightly overlap the ends of wattles by 24 inches. Abutting the wattles ends to each other is not acceptable.

Place straw wattles along the top of each slope where water congregates and flows as a point source over the slope below. Redirect and diffuse all above slope water flows so that it does not flow over the slope as a point-source or concentrated flow. Do place wattles or coir rolls on repair levee slopes. Place and space straw wattles according to paragraph

APPLICATIONS.

Where coir rolls are required, follow all trenching, overlapping and staking as per straw wattle requirement.

3.7 INSTALLING ROLLED EROSION CONTROL PRODUCTS

On slopes, place RECP by unrolling down slope. Anchor the terminal ends of the material in a 6 inch x 6 inch deep trench; backfill and compact.

Overlap side edges by 3 inches. Anchor edges down the entire length of material with staples using a 12 inch interval. Ensure "uphill" end of the overlap is placed over the "downhill" end. At the top and bottom of each overlap, use a double row spaced 6 inches apart, with staples spaced at 6 inch intervals along each row to secure overlaps.

In canals and ditches place RECP by unrolling at top of canal in the direction of flow along bottom centerline of canal. Do place RECP in irrigation ditches. Ensure "uphill" end of the overlap is placed over the "downhill" end. At the top and bottom of each overlap, use a double row of staples spaced 6 inches apart, with staples spaced at 6 inch intervals, to secure overlaps. Overlap side edges by 3 inches. Anchor the terminal end

SECTION 32 92 33 Page 15 of the material in a 6 inch square deep trench; backfill and compact.

Place subsequent material end over end with a 6 inch overlap. Anchor edges down the entire length of material with staples using a 12 inch interval.

Anchor material edges as indicated above. In addition to the end and edge staples, anchor the entire material surface to the soil using staples applied in an off-set pattern as recommended by the manufacturer. Where the requirements herein conflict with specification Section 01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL, provide the more stringent requirement.

3.8 INSTALLING CHECK DAMS

In ditches and canals, provide 12 inch diameter coir fiber roll check dams completely across ditch or canal and perpendicular to water flows. Extend fiber roll ends up the side slopes a minimum of 24 inches above the canal/ditch expected flow line. Anchor rolls using 24 inch long wooden stakes within 12 inches of both ends and spaced continuously at 24 inches on center, maximum, along its entire length and at all grade breaks. Set fiber rolls into a pre-dug 3 inch deep trench, and ensure contact with the soil along its entire length. Place and space check dams according to paragraph APPLICATIONS.

3.9 REPAIRING OF DAMAGED OR UNSUCCESSFUL GRASS STANDS

For the duration of the Contract perform active grass maintenance that will give the grass seed the best opportunity to persist and mature. In those areas that are without active construction activities, or that have reels, ruts, gullies, or have not met the performance standards; re-grade, repair, and reseed within 5 working days of discovery. Maintain and protect it for the duration of the Contract. See paragraph PERFORMANCE STANDARDS.

Protect the newly seeded areas as per the requirements indicated herein and as per specification Section 01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL, whichever is more stringent. Also provide BMPs where it is observed where water concentrates and flows over slopes causing erosion.

The project will not be accepted without the performance standards being met.

3.10 ESTABLISHMENT

3.10.1 Grass Establishment Period

Provide proper care of the seeded areas until all of the following are met:

the desired stand of grass is established and it has achieved the performance standards indicated herein, until it has met and received a notice of termination from the State Water Quality Board, and a written acceptance is issued by the Contracting Officer. Make regular repairs through the duration of the Contract so that the grass seed has an opportunity to mature and establish before the end of the Contract. The desired stand of vegetation is defined herein in paragraph PERFORMANCE

STANDARDS.

3.10.2 Protection

Protect areas susceptible to vehicular or heavy foot traffic by erecting suitable barricades immediately after seeding is completed and/or by placing warning signs of a type approved by the Contracting Officer.

SECTION 32 92 33 Page 16

3.11 CLEANUP

Remove and dispose of excess and waste erosion control material off-site in accordance with State and local agency codes and regulations.

-- End of Section --

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SCALE: 1" = 20'

CONSTRUCTION NOTES:

1. IF THERE IS A VARIATION BETWEEN EXISTING

GROUND AND CONSTRUCTED SLOPE, PROVIDE

SMOOTH TRANSITION TO EXISTING GROUND AT A

MINIMUM 4:1 SLOPE FOR ALL AREAS OF DESIGN.

KEYNOTES:

RELOCATED CANAL (EXISTING ENCROACHMENT). SEE

A1 SHEET C-502 FOR CANAL DETAIL.

EXISTING (2) 48" CMP. SEE SHEET CD-101.

INSTALL (2) NEW 48" 10-GAUGE CMP. SEE B1 SHEET

C-501 FOR TYPICAL CULVERT SECTION AND

ELEVATIONS.

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ENCROACHMENT). SEE A3 SHEET C-501 FOR TYPICAL

CROSS CANAL DETAIL.

REMOVE AND REPLACE FULL LENGTH IN-KIND 24"

CMP. PLACE PIPE AT PRE-CONSTRUCTION INVERT

ELEVATIONS.

CANAL STA. 4+75. BEGIN CANAL REALIGNMENT.

CANAL INVERT TO MATCH EXISTING ADJACENT

ELEVATION.

LEVEE CROWN CENTERLINE ALIGNMENT. SEE SHEET

G-004.

RELOCATED CANAL CENTERLINE ALIGNMENT. SEE

SHEET G-004.

CANAL STA. 10+75. END CANAL REALIGNMENT. CANAL

INVERT TO MATCH EXISTING ADJACENT ELEVATION.

ACCESS ROAD. SEE A2 SHEET C-501 FOR TYPICAL

ACCESS ROAD SECTION.

LEVEE CROWN. SEE C1 SHEET C-301 FOR TYPICAL

LEVEE CROWN SECTION.

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Bid Schedule (Site 0412-28)

PL 84-99 Emergency Levee Repair Yolo County, California

BASE WORK

Estimated Unit of Unit Description Quantity Measure Price Total Price

Mobilization and Demobilization 1 JOB $ $

SWPPP Development and 1 JOB $ _______ $ ____________ Implementation

Canal Diversion 1 JOB $ _______ $ ____________

Groundwater Dewatering** 1 JOB $ _______ $ ____________ (Continuous - Up to 1,500 gpm)

Two (2) 48-in Corrugated Metal Pipes 1 JOB $ _______ $ ____________

Clearing, Grubbing, and Stripping* 1.5 AC $ _______ $ ____________

Excavate Stone Revetment 350 CY $ _______ $ ____________

Load and Haul Stone Revetment 350 CY $ _______ $ ____________

Excavation* 25,300 CY $ _______ $ ____________

Levee Fill – Levee* 18,100 CY $ _______ $ ____________

Random Fill – Canal Relocation* 7,900 CY $ _______ $ ____________

Top Soil* 4,100 SY $ _______ $ ____________

Hydro-Seeding* 4,100 SY $ _______ $ ____________

Aggregate Base – Levee Crown* 130 CY $ _______ $ ____________

Aggregate Base – Access Road* 130 CY $ _______ $ ____________

24-Inch Corrugated Metal Pipe 40 LF $ _______ $ ____________

TOTAL ESTIMATED BASE PRICE $ ____________

Remove 4-Inch Asphalt Coated Steel Natural Gas Pipe 1 JOB $ _______ $ ____________

Groundwater Dewatering 1 JOB $ _______ $ ____________ (Additional 500 gpm beyond the base amount)

Groundwater Dewatering 1 JOB $ _______ $ ____________ (Additional 500 gpm beyond the above option)

Groundwater Dewatering 1 JOB $ _______ $ ____________ (Additional 500 gpm beyond the above option)

Groundwater Dewatering 1 JOB $ _______ $ ____________ (Additional 500 gpm beyond the above option)

TOTAL OPTION WORK $ ____________

TOTAL BASE WORK + OPTION WORK $ ____________

NOTE: AC is acre, CY is cubic yard, EA is each, TN is ton, SY is square yard, and LF is linear foot.

*Indicates quantity is estimated and subject to Federal Acquisition Regulation clause 52.212-11 Variation in Estimated Quantity.

**Flow shall be continuous so that subsurface drawdown is continuous. Upper limit of dewatering is unknown, but must be continuous in order to maintain acceptable groundwater levels.

3.5.4 Hydroseeding with Bonded Fiber Matrix

3.11 CLEANUP