TABLE OF CONTENTS

1 SUMMARY OF WORK

2 QUALITY CONTROL

3 PROJECT MEETINGS

5 MEASUREMENT AND PAYMENT

8 CLOSEOUT PROCEDURES

11 COORDINATION OF WORK

13 WATER POLLUTION, EROSION, AND SEDIMENT CONTROL

15 EXISTING FACILITIES

16 TEMPORARY FACILITIES

17 CLEARING AND GRUBBING

19 EARTHWORK

65 STORM DRAINAGE FACILITIES

ATTACHMENT ‘A’ – SUBMITTAL LIST

1 SUMMARY OF WORK

PART I – GENERAL

1.01 DESCRIPTION

A component in one contract part applies as appearing in each. The Plans and Specifications are complementary, describe, and provide for complete work. The work to be done under the Contract shall comply with all requirements of the Plans and Specifications, the Standard Specifications, and the Standard Plans unless modified in writing by the Engineer. In case of conflict, the stricter or more conservative specification, as determined by the Engineer, shall apply.

The work to be done under the Contract, except as modified or supplemented in these Special Provisions, shall adhere to the following order of precedence:

A. The project plans (Plans) and Special Provisions (Specifications).

B. The State of California Department of Transportation (Caltrans) 2025 Standard Specifications (Standard Specifications).

C. 2025 Caltrans Standard Plans (Standard Plans).

D. 2026 Caltrans CA Manual on Uniform Traffic Control Devices (CAMUTCD).

E. 2023 Napa County Road & Street Standards, Specifications, and Details.

1.02 SUMMARY OF WORK

A. Refer to the Special Provisions General Conditions, “Description of Work”.

1.03 SEQUENCE AND SCHEDULE REQUIREMENTS

A. Refer to the Special Provisions General Conditions, “Beginning of Work, Time of Completion, and Liquidated Damages”.

1.04 USE OF PROJECT SITE

A. The Contractor shall limit their operations to the limits shown on the Plans or as approved in writing by the Engineer.

B. If requested by the Engineer, Contractor shall submit the construction vehicle and equipment access route(s) to the project site to the Engineer for approval.

C. Staging Area

1. The Contractor shall submit a Construction Staging Plan to be approved by the Engineer.

2. The Contractor shall restore the site at the Contractor’s own cost prior to demobilization.

Failure to restore the site to the property owner’s satisfaction will result in delay in release of final payments until the issue has been resolved.

3. Staging Area will be allowed within the County’s Right-of-Way, at locations approved by the Engineer.

D. See the Special Provisions General Conditions “Mobilization” for requirements related to the protection of existing property.

1.05 COORDINATION

A. Coordination of work shall conform to Section 11 “Coordination of Work” of these Technical Specifications.

B. The Contractor is responsible for coordinating with utility agencies for utility standby and any utility relocation.

1. Note that no utilities are proposed to be relocated as part of the project scope, additionally, no known utilities are located in the project area.

1.06 PERMITS OBTAINED BY THE COUNTY

A. Reserved.

1.07 PERMITS OBTAINED BY THE CONTRACTOR

A. Permits required for Contractor’s Operation.

PART 2 – PRODUCTS – NOT USED

PART 3 – EXECUTION – NOT USED

PART 4 – MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as included in the Contract price for the various bid items, and no separate payment will be made.

2 QUALITY CONTROL

PART 1 – GENERAL

1.01 DESCRIPTION

A. The Contractor is responsible for Quality Control.

B. The Contractor is responsible for the quality of the work including materials and workmanship performed by the subcontractors.

C. The Contractor will cooperate and coordinate with the County for Quality Assurance testing performed by the County.

D. The County performing Quality Assurance inspections and testing does not relieve the Contractor from the responsibility of performing all Quality Control testing required to deliver a quality product.

E. Quality Control includes all tasks required to deliver a coordinated and complete project that is in compliance with the intent of the Contract Documents.

PART 2 – PRODUCTS - NOT USED

PART 3 – EXECUTION

3.01 SITE INVESTIGATION AND CONTROL

A. The Contractor shall verify all dimensions in the field and shall check all field conditions continuously during construction. The Contractor shall be solely responsible for any inaccuracies built into the Work. The Contractor shall inspect related and appurtenant work and shall report in writing to the Engineer any conditions that will prevent proper completion of the Work. Any required removal, repair, or replacement caused by unsuitable conditions shall be done by the Contractor at its sole cost and expense.

3.02 INSPECTION OF WORK

A. The Work shall be conducted under the general observation of the Engineer and shall be subject to inspection by the County and other agencies having jurisdiction over the project to assure strict compliance with the requirements of the Contract Documents.

B. The authorized representative of the Engineer on the project site shall be acting directly and through various inspectors at the site. The presence of the inspectors, however, shall not relieve the Contractor of their responsibility for the proper execution of the Work in accordance with all requirements of the contract documents. Compliance is a duty of the Contractor and shall not be avoided by any act or omission on the part of an inspector.

C. All materials and articles furnished by the Contractor shall be subject to inspection. No material or articles shall be used in the Work until it has been inspected and accepted by the Engineer or by the County.

D. Source Inspection: Some material shall be subject to inspection by the Engineer or their authorized representative at the place of production.

E. The presence of the Engineer at the place of production shall not relieve the Contractor of the responsibility for furnishing products, materials, and equipment that comply with all requirements of the contract documents.

3.03 SAMPLING AND TESTING

A. Unless otherwise specified in these Special Provisions, all sampling and testing shall be in accordance with the methods prescribed in the current standards of Caltrans, ASTM, or other specified published standards, as applicable to the class and nature of the article or materials considered. The County reserves the right to use any generally accepted system of sampling and testing which, in the opinion of the Engineer, will assure the County that the quality of the workmanship is in full accord with the contract documents.

B. Any waiver by the County of any specific testing or other quality assurance measures, whether or not such waiver is accompanied by a guarantee of substantial performance as a relief from the specified testing or other quality assurance requirements as originally specified, and whether or not such guarantee is accompanied by a "performance bond" to assure execution of any necessary corrective or remedial Work, shall not be construed as a waiver of any prescriptive or performance requirements of the contract documents.

"Performance bond" as used in this section is a separate bond in addition to the Contract Performance Bond required in the General Conditions.

C. Notwithstanding the existence of a waiver, and in addition to any testing and inspection performed by any other inspector on behalf of the County or any other public agency having jurisdictions over the project, the Engineer shall have the right to make independent investigations and tests, and failure of any portion of the Work to meet any of the requirements of the contract documents shall be reasonable cause for the Engineer to require the removal or correction and reconstruction of any such work in accordance with the General Conditions.

3.04 TIME OF INSPECTIONS AND TESTS

A. Samples and test specimens required under the contract documents shall be furnished by the Contractor and prepared for testing in time for the completion of the necessary tests and analyses before the subject materials or articles are to be used.

B. The County may perform field density testing. The Contractor shall furnish all required test specimens at its own expense. Except as otherwise provided in the contract documents, performance of the required initial test will be by the County and all costs will be borne by the County except that the cost of any test (retesting) after the initial test shall be borne by the Contractor. The County performing Quality Assurance testing does not relieve the Contractor from its responsibility of performing all required Quality Control testing to deliver a quality project.

C. The Contractor at the Contractor’s own expense shall perform field testing for utilities that may be affected by the Work. The Contractor shall coordinate and schedule witnessing of field testing with the County and any other agency having jurisdiction over the project. The Contractor shall notify the Engineer no less than 48 hours in advance of beginning field testing.

D. Whenever the Contractor is ready to backfill, bury, cast in concrete, hide, or otherwise cover or make inaccessible any work under the Contract, the Contractor shall notify the Engineer no less than 48 hours in advance of beginning any work of backfilling, burying, casting in concrete, hiding, covering, or making inaccessible any portion of the Work to be inspected so that required inspections can be performed.

E. Failure by the Contractor to notify the Engineer at least 48 hours in advance of any inspection or field testing shall be reasonable cause for the Engineer to require sufficient delay in the Contractor's schedule to allow time for such inspections and any remedial or corrective work required. All costs of such delays, including its impact or effect upon the Work, shall be borne by the Contractor.

3.05 DEFECTIVE AND NONCOMPLIANT WORK

A. Attention is directed to Section 5-1.30 “Noncompliant and Unauthorized Work” and Section 5-1.39 “Damage Repair and Restoration” of the Standard Specifications.

B. Per Section 5-1.30 “Noncompliant and Unauthorized Work” of the Standard Specifications, the Contractor shall correct or remove and replace work that does not comply with the Contract at Contractor’s cost. County will reduce payment for non-compliant work left in place until the work has been corrected. If the Contractor fails to comply promptly with an order under Section 5-1.30, the County may correct, remove, or replace noncompliant or unauthorized work. The County will deduct the cost of this work from the Contract.

C. Per Section 5-1.39 “Damage Repair and Restoration” of the Standard Specifications, before Contract acceptance, the Contractor shall restore damaged work to the same state of completion as before the damage. The County does not adjust payment for repair or restoration that the Engineer determines was caused by the Contractor’s failure to construct the work under the Contract or protect the work.

D. The Contractor shall submit a repair or restoration work plan and schedule for the approval of the Engineer prior to proceeding with work. The submittal must comply with the requirements in the Special Provisions General Conditions “Submittal Procedures”.

PART 4 - MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as included in the contract price for the various bid items, and no separate payment will be

3 PROJECT MEETINGS

PART 1 - GENERAL

1.01 SUMMARY

A. This section includes:

1. Contractor participation in a preconstruction conference.

2. Administration of progress meetings.

3. See Special Provisions General Conditions, “Prosecution and Progress”.

1.02 PRECONSTRUCTION CONFERENCES

A. The Engineer will administer a preconstruction conference for the purpose of executing County-Contractor agreements and will provide clarification of County and Contractor responsibilities in the use of the Work site and review administrative procedures, contract documents, standards, correspondence, and submittal requirements.

1. Personnel present at this meeting may include the Engineer, inspector, design consultants, environmental consultants, quality assurance team, archeologist, County representatives, and representatives of other agencies, the Contractor, job superintendent, and the major subcontractors and their foremen or superintendents, as appropriate, who will be working on the site.

2. The Contractor shall be prepared to discuss timing, procedures for smooth job progress, items requiring clarification, distribution of documents, and correspondence with the Engineer and other County representatives.

1.03 PROGRESS MEETINGS

A. The Engineer shall schedule and administer project meetings throughout progress of the Work, at weekly intervals, and other meetings as needed throughout construction.

1. The Engineer shall prepare an agenda with copies for participants and record minutes and distribute copies within three (3) days to the Contractor and the project team. Those affected by decisions made at the meetings may also be notified.

2. Attendance: Contractor's job superintendent, major subcontractors and suppliers, design consultants, environmental consultant, quality assurance team, archeologist, other representatives of the County and other agencies as appropriate to address topics for each meeting.

3. Suggested Agenda: Review of Work progress, status of progress schedule and adjustments, material order and delivery schedules, submittals, maintenance of quality standards, pending changes and substitutions, and other items affecting the progress of Work.

B. Meeting minutes shall include a running list of action items for the Contractor. The contents of minutes do not constitute a part of the contract documents. Contract requirements can only be amended by a contract change order (CCO).

C. The Contractor shall prepare, maintain, and distribute logs for change orders, requests for information, submittals, etc. Logs will be submitted at the weekly meetings.

1.04 ENVIRONMENTAL EDUCATION MEETINGS

A. Reserved.

PART 2 – PRODUCTS - NOT USED

PART 3 – EXECUTION - NOT USED

PART 4 - MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as

5 MEASUREMENT AND PAYMENT

PART 1 – MEASUREMENT AND PAYMENT

1.01 WORK INCLUDED

A. This Specification section describes contract requirements for the measurement and payment for work performed under this Contract.

B. Payment for each Contract bid item includes full compensation for all labor, equipment, tools, supplies, and incidentals necessary to complete the work.

C. See Special Provision General Conditions, “Measurement and Payment”, and Section 9 “Payment” of the Standard Specifications.

1.02 MEASUREMENT AND PAYMENT

A. Lump Sum Bid Items:

1. Payment items for the work of this Contract for which contract lump sum payments will be made are listed in the Bid Schedule and described below. All costs for items of work, which are not specifically mentioned in a particular lump sum payment item, shall be included in the listed lump sum item most closely associated with the work involved.

The lump sum price and payment made for each item listed shall constitute full compensation for furnishing all labor, materials, and equipment, and performing any associated Contractor quality control, environmental protection, meeting safety requirements, tests, and reports, and for performing all work required for which separate payment is not otherwise provided.

B. Unit Price Bid Items:

1. Items of work listed in the Bid Schedule that are Unit Price bid items shall be measured for payment as set forth under the description of each relative bid item.

2. All measurements for payment purposes shall be made by the Engineer unless noted otherwise by the Engineer.

C. Partial Retention Release

1. Reserved.

D. Waiver Certificate

1. CALIFORNIA LIEN WAIVER AND RELEASE UPON PROGRESS PAYMENT

a. The Contractor shall submit a Conditional Waiver and Release on Progress Payment form with each progress payment request.

2. CALIFORNIA LIEN WAIVER AND RELEASE UPON FINAL PAYMENT

a. The Contractor shall submit a Conditional Waiver and Release on Final Payment form with final payment request.

1.03 DESCRIPTION OF BID ITEMS

A. The Bid Schedule bid items are presented to indicate major categories of the work for purposes of comparative bid analysis, payment, breakdown for monthly progress payments, and final payment to the Contractor under the Contract. The Bid Schedule is not intended to be exclusive descriptions of work categories and the Contractor shall determine and include in its pricing all materials, labor, equipment, and operations necessary to complete each bid item of work, as shown and specified, and all costs of compliance with all applicable regulations of public agencies having jurisdiction, including, but not limited to, the health and safety requirements of the California Division of Industrial safety and the Occupational Safety and Health Administration of the U.S. Department of Labor (OSHA).

PART 2 – PRODUCTS – NOT USED

PART 3 – EXECUTION – NOT USED

PART 4 – MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as

8 CLOSEOUT PROCEDURES

1.01 SUMMARY

A. This section includes: Closeout procedures, final submittals, final cleaning and adjusting, project record documents, submittal of operation and maintenance data, and warranties and bonds.

1.02 SUBSTANTIAL COMPLETION

A. Preliminary Procedures: Before requesting an inspection to determine the date of Substantial Completion, complete the following and provide a list of items that are incomplete:

1. Prepare a list of items to be completed and corrected (punch list), the value of items on the list, and reasons why the Work is not complete.

2. Advise County of pending insurance changeover requirements.

3. Submit specific warranties, workmanship bonds, maintenance service agreements, final certifications, and similar documents.

4. Prepare and submit Project Record Documents, damage or settlement surveys, property surveys, corner records, and similar final record information.

5. Terminate and remove temporary facilities from Work site, along with mockups, construction tools, and similar elements.

6. Complete final cleaning requirements.

7. Restore disturbed areas, including staging areas and access routes within and to the site.

B. Inspection: Submit a written request for the Substantial Completion inspection. On receipt of request, the Engineer will either proceed with inspection or notify the Contractor of unfulfilled requirements. The Engineer will prepare the Certificate of Substantial Completion after inspection or will notify the Contractor of items, either on the Contractor's list or additional items identified by the Engineer that must be completed or corrected before the certificate will be issued.

1. Re-inspection: Request re-inspection when the work identified, in previous inspections as incomplete, is completed or corrected.

2. Results of completed inspection will form the basis of requirements for Final Completion.

3. Re-inspection: Request re-inspection when the work identified, in previous inspections as incomplete, is completed or corrected.

1.03 FINAL COMPLETION

A. Preliminary Procedures: Before requesting final inspection for determining the date of Final Completion, the Contractor shall complete the following:

1. Submit a final Application for Payment according to the Section 5 “Measurement and Payment Procedures” of the Technical Specifications.

2. Submit certified copy of the Engineer’s Substantial Completion inspection list of items to be completed or corrected (punch list), endorsed, and dated by the Engineer. The certified copy of the list shall state that each item has been completed or otherwise resolved for acceptance.

3. Instruct County personnel in operation, adjustment, and maintenance of products, equipment, and systems. Provide services of skilled and competent supervisory personnel to instruct County personnel in the operation and maintenance of all operating equipment and systems provided as part of the Contract.

B. Inspection: Submit a written request for final inspection for acceptance. On receipt of request, the Engineer will either proceed with inspection or notify the Contractor of unfulfilled requirements. The Engineer will prepare a final Certificate for Payment after inspection or will notify the Contractor of construction that must be completed or corrected before the certificate will be issued.

1. Re-inspection: Request re-inspection when the work identified in previous inspections as incomplete, is completed or corrected.

1.04 LIST OF INCOMPLETE ITEMS (PUNCH LIST)

A. Preparation: Include name and identification of each space and area affected by construction operations for incomplete items and items needing correction including, if necessary, areas disturbed by the Contractor that are outside the limits of construction.

1. Organize items applying to each work area.

2. Include the following information at the top of each page:

a. Project name.

b. Date.

c. Name of the Engineer.

d. Name of the Contractor.

e. Page number.

1.05 PROJECT RECORD DOCUMENTS

A. Maintain on the site one set of the following Record Documents to record actual revisions to the Work.

1. Daily Working Logs/Reports, refer to the Special Provisions General Conditions “Mobilization”.

2. Plans.

3. Specifications.

4. Addenda.

5. Change Orders and other Modifications to the Contract.

6. Reviewed shop drawings and product data.

B. Store Record Documents separate from documents used for construction. Record information concurrent with construction progress.

C. Record Drawings: Do not permanently conceal any work until required information has been recorded. Legibly mark each item to record actual construction, including:

1. Measured elevations of all improvements.

2. Measured horizontal and vertical locations of all improvements including but not necessarily limited to: grade beams, guardrails, pedestrian railing, ditches, and drains and drainage systems.

3. Field changes of dimension and detail.

4. Details not on original Plans.

5. Deviations from sizes, locations, and other changes to installation as shown on the Contract documents.

6. Established locations of underground work, points of connection with existing utilities, changes in direction of underground lines, locations of valves, manholes, etc.

7. Location of all items unconcealed that the Contractor elects to alter or modify from the contract documents, contingent upon the Engineer’s approval to alter or modify them.

D. Specifications: Legibly mark and record at each Product section a description of actual Products installed, including the following:

1. Manufacturer's name and product model and number.

2. Product substitutions or alternates utilized.

3. Changes made by Addenda and Modifications with corresponding Addenda or Modification number.

E. Submit all Record Documents to the Engineer with claim for Substantial Completion inspection. Submit documents with a transmittal letter containing date, Project title, the Contractor's name and address, list of documents, and signature of the Contractor.

F. The Engineer will return Contract Drawings and Record Documents to the Contractor. The Contractor shall transfer all as-built information onto a set of reproducible prints for the County’s use.

G. The County will not make Final Payment to the Contractor until the Record Documents are provided by the Contractor.

1.06 WARRANTIES AND BONDS

A. Submit warranties and bonds prior to final Application for Payment.

1. For equipment put into use with the County’s permission during construction, submit within ten (10) days after first operation.

2. On request of the County, for designated portions of the Work, submit within ten (10) days of commencement of warranty.

3. For items of Work delayed beyond date of Substantial Completion, provide updated submittal within ten (10) days after acceptance, listing date of acceptance as start of warranty period.

B. The General Conditions of the Contract Documents cover the Contractor's responsibility to remedy defects due to faulty workmanship and materials which appear within one (1) year from the Date of Acceptance. Warranties for more than one (1) year, where indicated in the various sections of the contract documents, shall be in the form of a warranty written on the letterhead of the Contractor, subcontractor, or supplier doing the work or supplying the item to be warranted, as follows:

WARRANTY FOR THE W Pueblo Ditch Repair Project (RDS 25-36)

We hereby warrant that the______________________________ which we have installed in NAPA COUNTY, CALIFORNIA for NAPA COUNTY, has been done in accordance with the Drawings and Specifications, and that the work, as installed, will fulfill the requirements of the warranty included in the Specifications. We agree to repair or replace any or all our work, together with any other and adjacent work which may be displaced by so doing, that may prove to be defective in its workmanship or material within a period of ___ years from the Date of Acceptance of the above-named Project, without any expenses whatsoever to the Owner, ordinary wear and tear and unusual abuse or neglect excepted.

In the event of our failure to comply with the above-mentioned conditions within a reasonable time, but in no event longer than thirty (30) days after being notified in writing by the Owner, we, collectively or separately, do hereby authorize the Owner to proceed to have said defects repaired and made good at our expense, and we will honor and pay the costs and charges therefore upon demand.

Signed

Subcontractor/Supplier Date

Countersigned

Contractor Date

PART 2 – PRODUCTS

2.01 MATERIALS

A. Cleaning Agents and Equipment: As recommended by the manufacturer or fabricator of the surface to be cleaned.

1. Do not use cleaning agents that are potentially hazardous to health or property or that might damage finished surfaces.

PART 3 - EXECUTION

3.01 FINAL CLEANING

A. General: Provide final cleaning. Conduct cleaning and waste-removal operations to comply with local laws and ordinances, and Federal and local environmental and antipollution regulations.

B. Complete the following cleaning operations before requesting inspection for certification of Substantial Completion for the Work or for a portion of Work:

1. Clean Project site, yard, and grounds, in areas disturbed by construction activities, including landscape development areas, of rubbish, waste material, litter, and other foreign substances.

2. Sweep paved areas broom clean. Remove petrochemical spills, stains, and other foreign deposits.

3. Pave all access roads to and within the site that are materially damaged from pre-project conditions.

4. Remove tools, construction equipment, machinery, and surplus material from Project site.

C. Comply with safety standards for cleaning. Do not burn waste materials. Do not bury debris or excess materials on County and private property. Do not discharge volatile, harmful, or dangerous materials into drainage systems. Remove waste materials from Work site and dispose of lawfully.

D. Remove tools, surplus materials, equipment, temporary buildings, sheds, and construction facilities from the site.

PART 4 - MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as

11 COORDINATION OF WORK

PART I – GENERAL

1.01 DESCRIPTION

A. The Contractor shall coordinate work with work to be performed by others, which may include, but may not be limited to:

1. Utility coordination.

2. Environmental survey and monitoring.

3. Quality Assurance: Survey Verification, QSD Inspections, Geotechnical Observations, Special Inspections, Material Testing, etc.

4. All other coordination that arises in the duration of the project.

B. The Contractor will coordinate location, connection points, inspection, and testing with the County and other entities that are involved in certain improvements on the project.

Coordinate work so that the project may be carried out smoothly, without interference or delays.

C. The Contractor shall maintain an 18-ft minimum clearance from any overhead utilities at all times during construction. Any activities which may infringe on this clearance shall be approved by the Engineer beforehand in writing, and Contractor shall utilize extreme caution during these activities.

D. Any damages to utilities by the Contractor’s operations will be borne by the Contractor and the County will not compensate for additional work caused by such damages.

E. The Contractor shall coordinate with the U.S. Postal Service and the garbage collection company.

PART 2 – PRODUCTS – NOT USED

PART 3 – EXECUTION

PART 4 – MEASUREMENT AND PAYMENT

A. Full compensation for complying with the provisions of this section shall be considered as

13 WATER POLLUTION, EROSION, AND SEDIMENT CONTROL

1.01 DESCRIPTION

A. These Special Provisions replace Section 13 "Water Pollution Control" and Section 21 “Erosion Control” of the Standard Specifications.

B. All operations shall be in compliance with the provisions of the Clean Water Act, Regional Water Quality Control Board, and the Napa Countywide Stormwater Pollution Prevention Program (NCSPPP) and policies with regard to protection of the storm water system from any pollutants.

C. Contractor shall provide all labor, material, and equipment necessary to complete all work required to conduct soil preparation and seeding operations described in this Section.

D. This section describes the following work:

1. Implementation of Best Management Practices (BMPs).

2. Sediment and erosion control measures.

3. Maintenance and repair of sediment and erosion control measures during construction.

4. Seed mix application during construction.

5. Hydraulic Wood/Straw Fiber Mulch.

E. All slopes and other exposed areas shall be seeded with seed mix as indicated in this section.

F. Contractor shall incorporate soil erosion BMPs and remove construction generated debris.

Refer to the Special Provisions General Conditions, "Disposition of Removed Materials".

G. Temporary and permanent erosion control devices with plastic netting shall not be used.

H. Contractor shall restore all disturbed areas and implement grading and erosion control measures, throughout the project limits, as shown on the Plans. Work shall not be limited to trenching areas. The entire project area shall be subject to restoration and stabilization.

I. Upon completion of construction activities and prior to demobilization and submitting a request for Substantial Completion, the Contractor shall seed the entire project area with an approved native grass seed mix. The Contractor shall also implement erosion control measures, including but not limited to, straw wattles and jute netting, as necessary, especially if restoration and seeding occur after October 15th.

1.02 PERMITS

A. Refer to Section 1 “Scope of Work” of these Technical Specifications.

1.03 DEFINITIONS

A. Construction Period: Between the dates of Notice to Proceed and Substantial Completion.

B. Finish Grade: Elevation of finished surface of topsoil ready for planting.

C. Seeding: Application of seed by hand or hydraulically applied methods.

D. Subgrade: Surface of elevation of subsoil remaining after completing excavation, or top surface of fill or backfill immediately beneath planting topsoil layer.

E. Weather Restrictions: Contractor shall stop project activities 24-hours prior to the National Weather Service forecast indicating at least a 30 percent chance of 0.25-inch precipitation or more.

1. No work shall occur during a dry-out period of 24 hours after the above referenced wet weather.

2. Work shall not resume until runoff ceases and there is less than a 30 percent chance of precipitation of at least 0.25-inches following the 24-hour dry-out period. Contractor shall receive Engineer’s approval prior to remobilizing on-site. Wet weather conditions shall not count against project workdays.

1.04 SUBMITTALS

A. Attention is directed to the Special Provisions General Conditions “Submittal Procedures”.

For each type of product, submit product certificates for:

1. Seed

2. Mycorrhizal Inoculant

3. Hydraulic Wood/Straw Fiber Mulch

4. Organic Tackifier

B. Product Certificates: For each type of manufactured product, signed by product manufacturer, and complying with the following:

1. Manufacturer’s certified analysis for standard products.

2. Analysis of other materials by a recognized laboratory made according to methods established by the Association of Official Analytical Chemists, where applicable, and stating source, physical/chemical composition, and quantity available.

3. Mulch: Product certificate for soil amendment showing physical and chemical analysis, certificate of amendment and signed by product manufacturer.

4. Certification of Seed: The supplier for each seed mix or single species bag shall provide a label attached to each bag with information for each species in the mix, stating the botanical and common name and percentage by weight of each species and percentage of purity, germination rate, and percent pure-live-seed, as well as seed content. The year of production and date of packaging shall be included on the label.

5. At the option of the Engineer, the Contractor may be required to submit a sample of any materials delivered to the site and analyses of the samples for review and approval by the Engineer.

6. For standard products, the manufacturer’s analyses guarantee will be acceptable. For all other materials, analyses shall be by a recognized laboratory. Analyses shall be made in accordance with the current methods of the Association of Official Agricultural Chemists and paid for by the Contractor.

C. The Contractor must submit the material data sheets of any temporary BMPs or erosion control materials proposed for use on-site, which may include, but are not limited to, straw wattles, jute netting, seeding, etc.

1.05 STORMWATER POLLUTION AND EROSION CONTROL PLAN

A. When weather restrictions forecast precipitation, all necessary erosion control measures shall be implemented prior to the onset of precipitation. Within 24 hours of a rain event, Contractor shall inspect the project site and correct any erosion and sediment problems and report these to the Engineer.

B. Contractor shall select and implement BMPs that are appropriate for the site and the Contractor’s actual methods of construction, access, and project phasing. The BMPs included in the Erosion Control Plan shall be selected in conformance with the SWRCB BMPs Construction Practice Handbook and Napa County Grading Ordinance Chapter 16.28 “Storm Water Management and Discharge Control”.

C. Contractor’s erosion and sediment control measures shall comply with the newest SWRCB Construction Stormwater Program:

https://www.waterboards.ca.gov/water_issues/programs/stormwater/constpermits.html

D. Contractor shall install and maintain erosion and sediment control measures, as needed, to mitigate the potential for sediment migration away from the work area and to open waters.

The Contractor shall modify and enhance these measures to meet permitting requirements and/or as needed to mitigate sediment migration at no additional expense to the County.

1.06 NON-STORM WATER CONTROL

A. The Contractor shall not fuel or wash equipment in the project area. The Contractor shall only perform fueling, maintenance, and emergency repair of vehicles and equipment offsite.

B. Inspect all equipment for leaks immediately prior to the start of construction, and regularly thereafter until equipment is removed from the site.

C. Dispose of all contaminated water, sludge, spill residue, or other hazardous compounds offsite at a lawfully permitted or authorized facility.

D. Clean up any accidental leaks or spills immediately and remove any contaminated soils or other materials offsite. Dispose offsite in accordance with all applicable laws. Contractor shall maintain onsite spill kits for emergency cleanup throughout the life of the project.

E. Immediately notify the Engineer in the event of any spill or release of any chemical in any physical form in the site during construction.

F. In case of any accidental spill the Contractor shall sample and analyze underlying soil for petroleum hydrocarbons and/or other chemical constituents as appropriate to determine if any contamination has occurred. The Contractor shall submit test results to the Engineer.

The Contractor shall be solely responsible for all costs incurred in removing any contamination caused by its activities. This includes, but is not limited to, contamination caused by accidental spills or leaks, wheel tracking, water runoff, water run on, and erosion.

1.07 TEMPORARY FACILITIES

https://www.waterboards.ca.gov/water_issues/programs/stormwater/constpermits.html

A. Project activities impacting soil or generating sediment shall adhere to the provisions contained in Section 13-5 “Temporary Soil Stabilization”, Section 13-6 “Temporary Sediment Control”, and Section 13-10 “Temporary Linear Sediment Barriers” of the Standard Specifications.

1.08 QUALITY ASSURANCE

A. Attention is directed to all the provisions of Section 21 “Erosion Control” of the Standard Specifications and these Special Provisions.

B. All seeding work shall be performed by personnel familiar with procedures and equipment required for the work and supervised by a qualified foreman with experience in seeding and establishment of native grasses on habitat restoration projects.

C. The Engineer shall inspect seed upon arrival at the job site for conformity to species and quality as indicated in the Drawings and these Specifications. Contractor shall provide Engineer with receipts of the seed purchased and delivered to the site. Contractor shall provide the seed certification information tag from each of the bags of seed used on the project. Seed certification information shall conform to the information listed in Submittals.

All seed not conforming to the requirements in these Specifications shall be considered defective, immediately removed from the project site, and replaced with conforming seed at the Contractor’s expense.

D. Immediately prior to commencement of seeding operations, the Contractor shall adjust and calibrate equipment as per manufacturer’s specifications and field test in the presence of the Engineer. Seeding equipment shall be thoroughly clean and not contain remnants of seed mixes from previous jobs.

1.09 DELIVERY, HANDLING AND STORAGE

A. Attention is directed to all the provisions of Section 21 “Erosion Control” of the Standard Specifications and these Special Provisions.

B. All commercially processed or packaged materials shall be delivered to the site in sealed bags or containers clearly marked to identify the item or materials.

C. Seed shall be stored in a cool, clean location away from moisture, contaminants, and rodents.

Seed shall be kept free of other seed sources such as weeds or agricultural products and shall not be stored where temperatures exceed 95 degrees Fahrenheit. The seed mix shall be delivered to the project site in sealed bags with the manufacturer’s tag indicating where the seed was purchased from, date purchased, the composition of the seed mix, the percent purity and germination rate. Tags shall be saved and submitted to the Engineer.

1.10 TIMING AND CONDITIONS

A. Seeding operations should be performed during desirable weather conditions. When excessive moisture, winds, or other unsatisfactory conditions prevail, the work shall be stopped until favorable weather conditions are present.

B. Prior to seed installation, all grading activities, as specified in Section 19 “Earthwork”, shall be completed and approved by the Engineer. All seeding areas shall be reasonably smooth and conform to the grading plan before seed bed preparation has begun.

C. Contractor will seed all improvements within 48 hours of completing finished grade and compaction, weather permitting.

D. All new and disturbed soil surfaces shall be seeded.

1.11 WARRANTY

B. Seed mixes installed shall be guaranteed throughout the Establishment Maintenance period against failure due to defects in materials, installation equipment, and routine maintenance.

C. The seed mix guarantee shall apply to normal growing conditions during which these species would be expected to survive. This guarantee does not apply to mortality resulting from abnormal weather conditions, floods, excessive rains, severe freezing, or drought as defined by the Engineer.

PART 2 - PRODUCTS

2.01 BEST MANAGEMENT PRACTICES (BMPs)

A. The following is a list of products for typical BMPs that the Contractor may employ throughout the site for erosion and sediment control:

1. Silt Fence: Woven filter fabric, UV resistant silt fence. Wooden or steel posts three (3) feet high minimum (does not include embedment).

2. Straw/coir Fiber roll: 100% Biodegradable 10-inch minimum diameter straw or coir/straw fiber roll. North American Green Sediment STOP, or approved equivalent.

3. Attention is directed to all the provisions of Section 21 “Erosion Control” of the Standard Specifications and these Special Provisions.

2.02 SEED MIX

A. State-certified seed of the latest season shall be provided in original sealed packages bearing the producer’s guaranteed analysis for percentages of mixture, purity, germination, hard seed, weed seed content, and inert materials. Labels shall be in conformance with AMS-01 and applicable state seed laws.

B. Wet, moldy, insect infested or otherwise damaged seed shall be rejected and removed from the project site.

C. Substitutions will not be allowed without a written request and approval from the Engineer.

D. Seed mixes shall be state certified seed of specified grass species with no less than 90% purity and 80% germination rate, with no more than 1.00% weed seed and guaranteed to be 100% free of prohibited and restricted noxious weeds identified in Section 52332 of the Food and Agriculture Code.

E. The Contractor shall make every effort to obtain the following commercially grown native seed from stock originating within the Napa River Watershed. If such seed source is not available, then the Contractor shall submit alternative sources for the specified mix to the Engineer for approval prior to ordering the seed.

2.03 INOCULANTS

A. Inoculants shall be endomycorrhizal biological inoculum manufactured by Mycorrhizal Applications or approved equivalent. Endomycorrhizal inoculum shall consist of spores, mycelium, and mycorrhizal root fragments of arbuscular fungi in a solid carrier suitable for handling by hydro-seeding or dry-seeding equipment. The rate of application of endomycorrhizal inoculum shall be based on the guarantee of the supplier or the analysis returned by an independent laboratory and shall be a minimum of 3,600,000 propagules per acre.

2.04 HYDRAULIC WOOD/STRAW FIBER MULCH

A. Hydraulic Wood/Straw Fiber mulch used to cover mechanically broadcast seed and ensure proper erosion protection shall be produced from annually renewable and certified weed-free rice straw, recycled paper, and other natural materials. Fiber mulch shall be free from plastic material, growth inhibiting additives, or other non-biodegradable substances. Fiber mulch shall be of such character that the fiber will disperse into a uniform slurry when mixed with water. Contractor shall use FiberWood Hydraulic Straw/Fiber Blend mulch manufactured by Fiber Wood, LLC, or approved equivalent.

B. Fiber Mulch shall be colored green and shall not stain concrete or painted surfaces. Fiber shall be free from growth or germination inhibiting materials.

2.05 ORGANIC TACKIFIER

A. Tackifer shall be a concentrated, biodegradable, and organic derivative of corn or other organic material. Tackifier shall be non-toxic to plant and animal life, non-corrosive, non-crystalline, and be non-staining to concrete or painted surfaces. Tackifier shall conform to Sections 21-2.01 and 21-2.02 of the Standard Specifications.

2.06 WATER

A. Attention is directed to all the provisions of Section 21 “Erosion Control” of the Standard Specifications and these Special Provisions.

B. Water shall be the responsibility of the Contractor, unless otherwise noted. Water shall not contain elements toxic to plant life.

PART 3 – EXECUTION

3.01 GENERAL REQUIREMENTS

A. General: All temporary and permanent storm water pollution prevention facilities, equipment, and materials as required by or as necessary to comply with the current California Stormwater Quality Association (CASQA) BMP Handbook.

B. Implement additional measures as needed to control erosion from exposed soil surfaces and to reduce sediment runoff from the project site. These measures shall be implemented and maintained throughout the construction and maintenance periods.

C. During construction, the Contractor shall maintain onsite sufficient quantities of erosion and sediment control materials to be installed in the event that rain is forecasted, and for rapid response to failures or emergencies. The Contractor shall consult the local weather forecast daily.

D. If rain is forecast during construction, the Contractor shall, at a minimum, secure all soil stockpiles by covering and/or installing a perimeter silt barrier.

E. All temporary erosion control measures deemed necessary for the maintenance period shall be installed at the time of substantial completion.

F. All exposed and disturbed areas and access points, that are left barren of vegetation as a result of construction activities, shall be restored by seeding with a blend of native erosion control grass seed. Seeded areas shall be mulched and revegetation shall be completed as soon as construction activities cease in those areas cease.

G. All seeding zones shall be broadcast seeded or hydroseeded. Prior to broadcast seeding, the seed bed must be scarified to a minimum of one (1) inch in depth using a flexible tine harrow or hand tools, to create a loose and friable topsoil medium.

H. Seeding application after October 15 must be covered with broadcast straw, jut netting, coconut fiber blanket, or a similar erosion control blanket.

3.02 HYDRAULIC WOOD/STRAW FIBER MULCH AND TACKIFER

A. Contractor may either stabilize the construction site by means of seeding or hydroseeding, whichever method will ensure stabilization and seed establishment prior to the rainy season.

B. All ties from straw mulch bales and seed bags are to be removed from the construction site before the start of mulching begins.

C. FiberWood Hydraulic Straw/Fiber Blend (hydro-mulch) or approved equal shall be mixed in a hydroseeding machine with organic tackifier and water. Organic tackifier shall be mixed with hydro-mulch to ensure an application rate of 120 pounds per acre (lbs/ac). Hydraulic Wood/Straw Fiber Mulch and Tackifier shall be applied over all seeded and disturbed areas at a rate of 3,000 lbs/ac.

D. Hydraulic Wood/Straw Fiber Mulch and Tackifier shall be started 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. Mulching shall be distributed loosely and evenly, without clumping or piling.

3.03 COIR/STRAW FIBER ROLLS

A. Coir/straw fiber rolls shall be installed in accordance with manufacturer recommendations.

B. Coir/straw fiber rolls shall be installed on all areas disturbed during construction, if needed for adequate erosion control. Risk level 2 projects require that linear sediment controls such as fiber rolls be installed at the toe of slope, face of slope and at grade breaks to comply with sheet flow lengths at a no more than 20-feet apart on slopes less than 25%.

C. Install all coir/straw fiber rolls subsequent to completion of fine grading in disturbed areas by October 15. Maintain coir/straw fiber rolls throughout the maintenance period. Following each rain event inspect coir fiber rolls and replace anchoring stakes and rolls as needed.

D. Install coir fiber roll in accordance with manufacturer’s recommendations and the following requirements:

1. Embed the fiber roll a minimum of four (4) inches below grade. Install fiber rolls by excavating a four (4) inch deep by ten (10) inch wide trench, placing the fiber roll into the trench, and backfilling with soil or gravel, as needed for proper anchoring.

2. Stake the fiber roll at three (3) feet on center. Install additional stakes as needed to completely anchor the coir fiber roll.

3. Align coir fiber roll installations along elevation contours.

4. Turn last ten (10) feet of fiber roll at right angles in the upslope direction (in an “L” shape), to allow for capture and dispersion of surface runoff.

E. Repair temporary fiber roll within 24 hours of discovering damage. If the Contractor’s vehicles, equipment, or activities disturb or displace temporary fiber roll, the Contractor shall repair temporary fiber roll at their expense.

F. County does not pay maintenance costs for cleanup, repair, removal, disposal, or replacement due to improper installation or Contractor negligence.

G. Removal: When the Engineer determines that the temporary fiber roll is not required, they must be removed and disposed legally. Ground disturbance, including holes and depressions, caused by the installation and removal of the temporary fiber roll must be backfilled and repaired.

3.04 SILT FENCE

A. Silt Fences may be used and installed as necessary during the project construction period as a temporary measure for sediment and erosion control.

B. At a minimum, install silt fences to enclose soil stockpiles if rain is forecasted and at the active channel bank (wet edge) throughout grading operations.

C. Silt fence placement and removal shall be coordinated and approved by the Engineer.

D. Install silt fence in accordance with manufacturer’s recommendations.

3.05 CHECK DAMS

A. Reserved.

3.06 JUTE MAT

A. Jute mat, or another similar approved material, shall be installed after construction if seeding takes place after October 15th, and in accordance with the manufacturer’s recommendations.

B. Jute mat may be used in conjunction with seeding, refer to Section 13-2.02 of these Special Provisions.

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