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PROJECT MANUAL

FOR

CONSTRUCTION OF

SAND SPRING RUN SUBSIDENCE REPAIR PROJECT

LOCATED NEARBY:

FROSTBURG

IN ALLEGANY COUNTY, MARYLAND

FOR THE

MARYLAND DEPARTMENT OF THE ENVIRONMENT

ABANDONED MINE LAND DIVISION

DGS PROJECT NO: F-001-260-004 DATE: May 19, 2026

PROJECT CLASSIFICATION B

DEPARTMENT OF GENERAL SERVICES

STATE OF MARYLAND

DEPARTMENT OF GENERAL SERVICES BOARD OF PUBLIC WORKS

ATIF T. CHAUDHRY, Secretary WES MOORE, Governor

301 West Preston Street BROOKE E. LIERMAN, Comptroller

Baltimore, MD 21201 DERECK E. DAVIS, Treasurer

MINORITY BUSINESS ENTERPRISES ARE ENCOURAGED TO RESPOND TO THIS SOLICITION

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DIVISION 0 - PROCUREMENT & CONTRACTING REQUIREMENTS

• Instructions to Bidders for Construction Projects (October 1, 2025) (eMaryland Marketplace Advantage attachment)

• General Conditions for Construction Contracts (July 1, 2022) (eMaryland Marketplace Advantage attachment)

• Bid/Proposal Affidavit (eMaryland Marketplace Advantage attachment)

• Payment of Employee Health Care Expenses Certification (eMaryland Marketplace Advantage attachment)

• Contractors Questionnaire (eMaryland Marketplace Advantage attachment)

• Bid Bond, if applicable (eMaryland Marketplace Advantage attachment)

• Minority Business Enterprise Forms Attachment D (September 1, 2026), if applicable (eMaryland Marketplace Advantage attachment)

• Veteran-owned Small Business Enterprise (VSBE) Forms Attachment E (September 1, 2022), if applicable (eMaryland Marketplace Advantage attachment)

• List of Prevailing Wage Rates, if applicable (eMaryland Marketplace Advantage attachment)

• Corporate Diversity Addendum, if applicable (eMaryland Marketplace Advantage attachment)

• Addenda, if any (eMaryland Marketplace Advantage attachment)

• Exhibit 2 – Sample Contract (eMaryland Marketplace Advantage attachment)

• Attachment P – Prime Contractor List of ALL Subcontractors Anticipated/Used During Contract

(eMaryland Marketplace Advantage attachment)

• Attachment AC - Certification of American-Manufactured Goods (eMaryland Marketplace Advantage attachment)

• Pre-Bid Conference/Site Visit – Refer to: State Finance and Procurement Article §14-302(a)(7)(v) and COMAR 21.11.03.09.C.(2)(e).

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TABLE OF CONTENTS

LIST OF DRAWINGS 4

DEFINITIONS 5

SUMMARY OF WORK 7

GENERAL REQUIREMENTS 8

STREAM RESTORATION – GENERAL 13

1. SITE PREPARATION 15

2. MOBILIZATION/DEMOBILIZATION 17

3. CONSTRUCTION LAYOUT STAKING 18

4. COMPOST FILTER SOCK (18”) 20

5. STREAM DIVERSION PUMP-AROUND 24

6. STABILIZED CONSTRUCTION ENTRANCE 27

7. TEMPORARY STREAM CROSSING 29

8. CHANNEL DEPOSITION EXCAVATION 31

9. CHANNEL EMBANKMENT PLACEMENT 37

10. BOULDER J-HOOK 42

11. BOULDER VANE 45

12. ROCK CONSTRUCTED RIFFLE 47

12.A. AASHTO #1 STONE 48

12.B. AASHTO #67 STONE 49

12.C. AASHTO R-3 RIP RAP 50

12.D. AASHTO R-4 RIP RAP 51

13. GROUTED RIPRAP CHANNEL BACKFILL 52

14. TOE WOOD WITH LIVE BRUSH LAYERING REPAIR 58

15. TOE WOOD WITH LIVE BRUSH LAYERING EXTENSION 61

16. 2” PLUGS 64

17. ERNMX-122 FACW MEADOW MIX LOWER STREAM BANK 68

18. TREES UPPER STREAM BANK (1 GALLON CONTAINER) 71

19. ERNMX-122 FACW MEADOW MIX UPPER STREAM BANK 75

20. BOULDER RIFFLE 78

21. TREES FORESTED FLOODPLAIN (1 GALLON CONTAINER) 80

22. ERNMX-122 FACW MEADOW MIX FORESTED FLOODPLAIN 84

23. ERNMX-173 EASTERN NATIVE HABITAT & CREP MIX 87

24. BIODEGRADABLE EROSION CONTROL MATTING (700 GRAM COIR FIBER) 90

25. TEMPORARY SEEDING 91

26. STRAW MULCHING 92

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LIST OF DRAWINGS

Sheet Number Sheet Title

000 Title Sheet

001 General Notes

002 Sequence of Construction

003 Summary of Estimated Quantities

004 Overview

200 Erosion and Sediment Control Notes

201 Erosion and Sediment Control Plan

300 Morphological Parameters and Typical Sections

301 Stream Restoration Plan & Profile Stations 0+00 to 4+00

302 Stream Restoration Plan & Profile Stations 4+00 to End

401 Post Storm Cross Sections

402 Post Storm Cross Sections

500 Planting Schedule and Tables

501 Planting Plan

600 Erosion and Sediment Control Details

601 Instream Structure Details

602 Instream Structure Details

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DEFINITIONS

Whenever used in the CONTRACT DOCUMENTS, the following terms shall have the meanings indicated which shall be applicable to both the singular and plural thereof:

ADDENDA - Written or graphic instruments issued prior to the execution of the Agreement which modify or interpret the CONTRACT DOCUMENTS, DRAWINGS and SPECIFICATIONS, by additions, deletions, clarifications or corrections.

BIDDER - Any person, firm or corporation submitting a BID for the WORK.

BONDS - Bid, Performance, and Payment Bonds and other instruments of security, furnished by the

CONTRACTOR and his surety in accordance with the CONTRACT DOCUMENTS.

CONTRACT DOCUMENTS - The contract, including Advertisement For Bids, Information For Bidders, BID, Bid

Bond, Agreement, Payment Bond, Performance Bond, NOTICE OF AWARD, NOTICE TO PROCEED, change order, DRAWINGS, SPECIFICATIONS, and ADDENDA.

CONTRACTOR - The person, firm or corporation with whom the OWNER has executed the Agreement.

DRAWINGS - The part of the CONTRACT DOCUMENTS which show the characteristics and scope of the

WORK to be performed and which have been prepared or approved by the ENGINEER.

ENGINEER – Maryland Department of the Environment – Abandoned Mine Land Division or their designated representative.

NOTICE OF AWARD - The written notice of the acceptance of the BID from the OWNER to the successful

BIDDER.

NOTICE TO PROCEED - Written communication issued by the OWNER to the CONTRACTOR authorizing him to proceed with the WORK and establishing the date of commencement of the WORK.

OWNER – Maryland Department of the Environment – Abandoned Mine Land Division, Allegany County, Maryland.

PROJECT - The undertaking to be performed as provided in the CONTRACT DOCUMENTS.

SHOP DRAWINGS - All drawings, diagrams, illustrations, brochures, schedules and other data which are prepared by the CONTRACTOR, a SUBCONTRACTOR, manufacturer, SUPPLIER or distributor, which illustrate how specific portions of the WORK shall be fabricated for installed.

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SPECIFICATIONS - A part of the CONTRACT DOCUMENTS consisting of written descriptions of a technical nature of materials, equipment, construction systems, standards and workmanship.

SUBCONTRACTOR - An individual, firm or corporation having a direct contract with the CONTRACTOR or with any other SUBCONTRACTOR for the performance of a part of the WORK at the site.

SUPPLIER - Any person or organization who supplies material or equipment for the WORK, including that fabricated of a special design, but who does not perform labor at the site.

WORK - All labor necessary to produce the construction required by the CONSTRUCTION DOCUMENTS, and all materials and equipment incorporated or to be incorporated in the PROJECT.

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SUMMARY OF WORK

PART 1 GENERAL

1.1 SCOPE OF WORK

The Sand Spring Run Subsidence Repair Project will include earthwork and activities to repair and restore a previously completed stream restoration and stream-sealing project that was damaged by severe flooding in 2025.

1.2 The State of Maryland General Contractor’s License is mandatory for all construction projects.

1.3 OWNERS

1.3.1 The project is located on land owned by Allegany Coal & Land Co. and Christopher L. and

Alice M. Hovatter.

1.3.2 The Project Owner is Maryland Department of the Environment – Abandoned Mine Land

Division.

1.3.3 The Project Manager is Tim Miller.

PART 2 MATERIALS

Construction material shall conform to the technical specifications provided herein.

PART 3 EXECUTION

The Contractor is and shall be responsible for the repair of any areas, paved or unpaved, damaged as a result of the

Contractor’s operations. Any damaged areas shall be repaired and restored to its original condition which existed prior to the start of project construction. Repair of paved areas shall contain the same pavement thickness including subbase as that which existed prior to construction.

Construction activities shall be limited to the following times: Monday through Saturday, 7:00 a.m. through 7:00 p.m. Construction during times other than those listed previously will require permission from the landowner and appropriate municipal authority.

PART 4 METHOD OF MEASUREMENT

Measurement of construction items shall be in accordance with the bid sheet provided herein (PART-6) under

GENERAL REQUIREMENTS. All items must be installed and completed to the satisfaction of the Engineer

PART 5 BASIS OF PAYMENT

All work described above, including labor, materials, and equipment, complete and accepted, shall be paid as specified in the bid sheet provided on eMMA under the pricing section/tab. Price and payment shall be full compensation for the completion of work related to these Items.

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GENERAL REQUIREMENTS

This work shall consist of furnishing all equipment, labor, supervision, and material necessary to ensure that grading, construction, and maintenance will be carried out to conform to the proposed reclamation plans designated hereafter.

The proposed work will involve, at a minimum, but not limited to, the following:

1.1 The upgrading as needed of existing access road and construction of new roads as needed to perform the contract work within the defined limits of disturbance. This shall include the installation of a temporary stream crossing and all erosion and sedimentation controls.

1.2 The clearing and grubbing of the proposed project area including the disposal area and installation of erosion and sediment control measures.

1.3 The removal of all deposition material down to the original grades provided on the construction drawings and redistribution, placement and compacting of this material in areas that have been eroded.

1.4 The repair of structures that have been damaged by erosion.

1.5 The installation of toe wood with live brush layering in areas shown on the construction plans.

1.6 If required, importing and placing steam substrate fill material to grades shown on the construction plans.

1.7 The planting, seeding and mulching of the different planting areas as shown on the Planting Plan.

1.8 Installation of biodegradable erosion control matting as shown on the construction plans.

1.9 As-built survey prior to any construction and after construction to determine volumes for pay items.

1.10 Submittals for substitutions are after award only.

1.11 Inspector’s field office is not required.

PART 2 COORDINATION AND INTERFERENCES

The Engineer's Drawings are generally diagrammatic and indicative of the work and as such cannot show actual construction conditions. Modifications to the work to compensate for minor interferences and structural obstructions shall be accomplished as part of the work at no additional cost to the State.

PART 3 SPECIAL REQUIREMENTS

3.1 The Contractor shall have the right to build and maintain temporary access roads within the designated work limits required to accomplish the work, subject to approval of the DGS/AMLD.

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All roads shall be regraded and stabilized upon completion of the site work or removed as directed by the DGS/AMLD.

3.2 Maintenance - The Contractor shall be responsible for maintaining all completed work until the final completion and acceptance of the project by the DGS/AMLD.

3.3 The Contractor shall always maintain a complete copy of the plans and specifications on the project site.

3.4 The Contractor shall be required to submit a Spill Prevention, Control and Counter measure

(SPCC) Plan for aboveground fuel storage containers if the storage capacity for a single container is more than 660 gallons or the aggregate aboveground storage capacity is greater than 1320 gallons. The SPCC plan should emphasize spill prevention and comply with the Environmental

Protection Agency (EPA) Oil Pollution Prevention Regulation, Title 40, Code of Federal

Regulations, Part 112.

3.5 The project will be conducted under the direction of the AMLD’s Representative. Wherever any features of the work are not set forth in these Drawings and Technical Specifications, it is understood that such work will be governed by the rules of the best prevailing practice for that class of work as determined by the AMLD/DGS.

3.6 The contractor shall video or adequately photograph the entire project site prior to starting construction in the event any issues arise during or after construction.

3.7 Warranty – The contractor shall warrant, unconditionally, inclusive of all equipment, materials, and workmanship, for a period of two (2) years, commencing on the date of substantial completion, as determined by the State of Maryland Representative:

a. That the work contains no faulty, imperfect material, equipment or any careless or unprofessional workmanship.

b. That the Contractor shall correct, repair, or replace with proper work, without cost to the

State of Maryland, its Agencies, Departments or Facilities, all work found not to be guaranteed by this section or otherwise not in conformity with the contract; the

Contractor will make good all damages caused to other work, the structure and its contents or materials in the process of complying with this project.

c. The Contractor shall correct any defects within three (3) working days, as defined by the

State, of notification of such defects.

d. The Contractor shall provide to the State copies of all manufacturer warranties associated with the Equipment.

3.8 This project is being funded through the Infrastructure Investment and Jobs Act, which was enacted on November 15, 2021. As part of the Act, the following items must be met for expenditure of funds:

a. Buy America Domestic Procurement Preference: -

As required by Section 70914 of the Bipartisan Infrastructure Law (also known as the

Infrastructure Investment and Jobs Act), P.L. 117-58, on or after May 14, 2022, none of the funds under a federal award that are part of Federal financial assistance program for infrastructure may be obligated for a project unless all of the iron, steel, manufactured

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Recipients of an award of Federal financial assistance are hereby notified that none of the funds provided under this award may be used for a project for infrastructure unless:

1. all iron and steel used in the project are produced in the United States--this means all manufacturing processes, from the initial melting stage through the application of coatings, occurred in the United States;

2. all manufactured products used in the project are produced in the United

States—this means the manufactured product was manufactured in the

United States; and the cost of the components of the manufactured product that are mined, produced, or manufactured in the United States is greater than

55 percent of the total cost of all components of the manufactured product, unless another standard for determining the minimum amount of domestic content of the manufactured product has been established under applicable law or regulation; and

3. all construction materials are manufactured in the United States—this means that all manufacturing processes for the construction material occurred in the

United States.

The Buy America preference only applies to articles, materials, and supplies that are consumed in, incorporated into, or affixed to an infrastructure project. As such, it does not apply to tools, equipment, and supplies, such as temporary scaffolding, brought to the construction site and removed at or before the completion of the infrastructure project.

Nor does a Buy America preference apply to equipment and furnishings, such as movable chairs, desks, and portable computer equipment, that are used at or within the finished infrastructure project, but are not an integral part of the structure or permanently affixed to the infrastructure project.

For further information on the Buy America preference, please visit www.doi.gov/grants/BuyAmerica. Additional information can also be found at the White

House Made in America Office website: www.whitehouse.gov/omb/management/made-in-america/.

Definitions

“Construction materials” includes an article, material, or supply that is or consists primarily of:

• non-ferrous metals;

• plastic and polymer-based products (including polyvinylchloride, composite building materials, and polymers used in fiber optic cables);

• glass (including optic glass);

• lumber; or

• drywall.

“Construction Materials” does not include cement and cementitious materials, aggregates such as stone, sand, or gravel, or aggregate binding agents or additives.

http://www.whitehouse.gov/omb/management/made-in-america/ http://www.whitehouse.gov/omb/management/made-in-america/

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“Domestic content procurement preference’’ means all iron and steel used in the project are produced in the United States; the manufactured products used in the project are produced in the United States; or the construction materials used in the project are produced in the United States.

“Infrastructure” includes, at a minimum, the structures, facilities, and equipment for, in the United States, roads, highways, and bridges; public transportation; dams, ports, harbors, and other maritime facilities; intercity passenger and freight railroads; freight and intermodal facilities; airports; water systems, including drinking water and wastewater systems; electrical transmission facilities and systems; utilities; broadband infrastructure; and buildings and real property. Infrastructure includes facilities that generate, transport, and distribute energy.

‘‘Project’’ means the construction, alteration, maintenance, or repair of infrastructure in the United States

b. Davis-Bacon Act - All laborers and mechanics employed by the contractor or subcontractors in the performance of construction, alteration, or repair work on this project must be paid wages not less than those prevailing on similar projects in the locality, as determined by the Secretary of Labor in accordance with the Davis-Bacon

Act (40 U.S.C. §§ 3141-3148). Accordingly, certified payrolls shall be submitted to

DGS/AMLD.

c. Applicant Violator System (AVS) – According to 30 C.F.R. §874.16 and §875.20, the successful bidder must be under eligible 30 C.F.R. §§ 773.12, 773.13, 773.14 at the time of contract award to receive a permit or be provisionally issued a permit to conduct surface mining operations. Within 5 days of notice of award, the successful bidder must submit the Applicant Violator System form located on OSMRE’s website located at: https://www.osmre.gov/avs. This form shall be submitted to the AMLD project manager who will verify that the company is eligible for contract award.

d. Coal Industry Employees - Contractors are to, when practicable, provide preference to current or former employees of the coal industry for work on this project. The contractor will report to DGS/AMLD on the extent to which current or former employees of the coal industry have been employed for this project. The contractor shall report the name employee, the position, the former or current coal industry employer, position in the coal industry (ie, equipment operator, surveyor, mechanic, etc).

PART 4 METHOD OF MEASUREMENT

Measurement of construction items shall be in accordance with the bid sheet provided herein (PART-6). All items must be installed and completed to the satisfaction of the Engineer

PART 5 BASIS OF PAYMENT

All work described above, including labor, materials, and equipment, complete and accepted, shall be paid as specified in the bid sheet provided on eMMA under the pricing section/tab, and payment shall be full compensation for the completion of work related to these Items.

https://www.osmre.gov/avs

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STREAM RESTORATION – GENERAL

PART 1 RELATED DOCUMENTS

The provisions of the contract apply to the work specified in this section.

PART 2 DESCRIPTION OF WORK

This specification covers all items related to construction of in-stream structures, including excavation of the proposed channel.

PART 3 REFERENCES

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

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM C 136 (1996a) Sieve Analysis of Fine and Coarse Aggregates

ASTM D 422 (1963; R 1998) Particle-Size Analysis of Soils

ASTM D 2487 (1998) Classification of Soils for Engineering Purposes

(Unified Soil Classification System)

MARYLAND DEPARTMENT OF THE ENVIRONMENT (MDE)

2011 Maryland Standards and Specifications for Soil Erosion and Sediment Control

Maryland Stormwater Design Manual, Volumes I and II

Maryland Waterway Construction Guidelines

MARYLAND STATE HIGHWAY ADMINISTRATION (SHA)

SHA Field Guide for Erosion and Sediment Control

Unless otherwise specified on the drawings or in these Technical Specifications, provide materials in accordance with the requirements of MDE and SHA.

PART 4 DEFINITIONS

4.1 BANKFULL ELEVATION

Bankfull elevation is the point of incipient flooding in an alluvial channel. This elevation is the reference for all elevations on or along the hydraulic structures described in the section and is clearly delineated in the project drawings.

4.2 BANKFULL BENCH

The bankfull bench is a constructed floodplain adjacent to the channel. The bankfull bench is constructed at the bankfull elevation.

4.3 FOOTING BOULDER (FOOTING STONE)

Footing boulders are boulders placed to provide a foundation for in-stream structures. Typically, footing boulders are buried in the channel bottom and not seen when the structure is completed. The minimum footing depth at the

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4.4 SURFACE BOULDER (SURFACE STONE)

Surface boulders are the top-most course of boulders used in each hydraulic structure. All surface boulders can be seen protruding from the water surface during extremely low flows. Surface boulders shall be durable sandstone with a median axis diameter of 3.0 feet.

4.5 VANE LENGTH

The vane length is the straight line portion of a boulder vane measured from the stream bank at bankfull elevation to the channel bed.

4.6 VANE ANGLE

The vane angle is the smallest angle measured between a vane and a line tangent to bankfull elevation at the point where the vane intersects the bank.

4.7 FLOODPLAIN SILL

A floodplain sill is the buried extension of the in-stream structure perpendicular to the flow direction of the bankfull channel that extends beyond the bankfull channel.

4.8 THALWEG

The thalweg is the lowest portion of the bankfull channel.

PART 5 MATERIALS

Refer to each technical specification for materials necessary for each structure or item of work.

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1. SITE PREPARATION

This work shall consist of clearing and grubbing, removing, and disposing of all vegetation and debris within the construction limits that is necessary to complete the work as indicated on the Contract Plans. This work shall also include preservation from injury or defacement of all vegetation and objects to remain. Native vegetation shall be preserved along the site where possible. Alignment stakes, grade stakes, guard stakes, boundary markers, benchmarks and tie points shall be preserved until such time as their usefulness has ceased and permission for their destruction is given by the Engineer.

PART 2 MATERIALS

Not Applicable.

PART 3 EXECUTION

3.1 CONSTRUCTION

All areas within the work limits indicated on the Plans shall be cleared and grubbed of the obstructions described.

For areas outside of the construction limits, existing ground cover shall be preserved insofar as possible, and the area shall be left neat and clear and in a condition which is reasonably consistent with the surroundings.

3.2 EROSION AND SEDIMENT CONTROL

Unless otherwise specified or approved, the clearing and grubbing area shall encompass the entire limits of disturbance. Maintain erosion and sediment controls as specified.

The grading operation extents will be limited to the Contractor’s ability to provide adequate resources to perform the grading in a timely manner and to provide and maintain the proper erosion and sediment control measures. The

Engineer is the final authority in this determination.

3.3 VEGETATION

The construction manager and/or designer will designate and mark trees, shrubbery, and plants that are to remain in place. At the direction of the construction manager and/or designer, the contractor shall cut and properly trim the branches of trees that are directly in the way of construction activities. Woody shrubs and trees that will be removed shall be cut flush with the ground.

Care shall be taken to preserve established trees in good condition located within the extents of the boundary.

Established trees whose diameter is greater than 12” and are not located within the proposed geosynthetic clay liner extents shall remain in place unless other directed by the Owner or Owner’s Representative.

3.4 GRUBBING

A. Excavation Areas. Remove all embedded stumps and roots to a depth of at least 3 ft below the subgrade or slope surface. Refill all depressions made below the subgrade or slope surfaces with materials suitable for embankment and compact as specified in Section 201.

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B. Low Embankments. Grub areas where the total depth of the embankment is less than 3 ft.

C. High Embankments. In areas where the embankment is 3 ft or more in depth, cut off trees and stumps as close to the ground as practical but not greater than 1 ft above the ground surface. Near the toe of embankment slopes, remove trees and stumps that are within 1 ft of the slope surface.

3.5 STREAM AND CHANNEL CHANGES.

When an LOD is not specified, clear and grub 5 ft beyond the top of the cut slopes or as directed.

3.6 DISPOSAL

A. Burning. On-site burning will not be permitted. Contractors shall be responsible for disposal of all debris and trash at an approved disposal site having all required state, local and federal permits.

B. Disposal Locations. Make all necessary arrangements to obtain suitable disposal locations. Furnish the Engineer with a copy of resulting agreements.

C. Wood Disposal. If disposal of wood to the public is proposed, submit the disposal plan to the

District Engineer for review, and obtain approval prior to beginning the clearing and grubbing operation. Perform this method of disposal from a location that is off the job site.

3.7 DAMAGE TO TREES AND OTHER PROTECTED RESOURCES

Ensure that the LOD and all protected resources are demarcated. Perform damage repair and damage compensation for damage beyond the LOD.

PART 4 METHOD OF MEASUREMENT

Measurement for Site Preparation shall be per lump sum, completed to the satisfaction of the Engineer.

PART 5 BASIS OF PAYMENT

Payment of Site Preparation shall be per lump sum. Payments as specified shall be considered full compensation for all labor, materials, equipment and incidentals necessary to perform the Work as required. No deduction will be made, nor will any increase be made, in the lump sum site preparation item amount regardless of decreases or increases in the final total contract amount or for any other cause.

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2. MOBILIZATION/DEMOBILIZATION

This work shall consist of the performance of preparatory operations for construction operations, including the movement of personnel and equipment to the project sites and for the establishment of the Contractor’s offices, buildings and other facilities including the construction of all temporary access roads as necessary to begin work on a substantial phase of the contract. The location of Contractor’s office (if established) shall be approved by the

Owner. It shall also include all demobilization activities involving the removal from the sites of all plant, equipment, supplies, and personnel after completion of the work including cleanup of all rubbish and waste materials generated during the construction of this project; and restoration of any damage to existing site improvements resulting from the Contractor’s activities at the site; and installation of the project sign.

PART 2 MATERIALS

Not Applicable.

PART 3 EXECUTION

The Contractor shall comply with the Owner and Engineer approved Schedule of Work. The Contractor shall provide adequate supervision, labor, tools, equipment, and materials to prosecute the work energetically and complete the work within the time specified.

The Contractor’s work hours for this project shall be from 7:00 a.m. to 7:00 p.m. Monday through Saturday. Work on Sunday and major holidays, as defined by the Engineer, will not be allowed on this project.

The Contractor shall maintain and protect traffic, protect the work in progress, protect adjacent property from excess dust resulting from the construction and maintain traffic through, around, or adjacent to the construction area. The

Contractor shall comply with OSHA Regulation 29CFR1926 Subpart P for excavation of trenches associated with pipe, culvert, subsurface drains, geosynthetic liner drainage systems, toe drains, wet mine seal constructions, and similar constructions. The Contractor shall also protect pedestrian and vehicular traffic around excavations and trenches in compliance with the U.S. Federal Highway Administration Manual of Uniform Traffic Control

Devices and the MDMUTCD, latest edition. In addition, the Contractor will be required to comply with all

Maryland Department of Transportation rules, regulations, weight limits, and speed limits associated with and posted on public roads used by the Contractor to access the project. The Contractor will be required to coordinate his operations with landowners and provide unrestricted access to them at all times. At the discretion of the

Engineer, the Contractor will be required to employ flag persons along public roads leading to the project area to direct traffic while hauling materials on and off site and other constructions. The Contractor will also be required to keep access roads used during construction of the project free of fugitive dust and clean of mud and other debris from the job site deposited by construction and other vehicles entering or leaving the project area.

Vehicles and equipment shall be thorough cleaned until visible debris is removed from the body and undercarriage prior to being transported away from the site. The purpose of this task is to reduce the possibility of invasive vegetative species being transported away from the project site and contaminating off-site locations.

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Measurement for Mobilization/Demobilization shall be per lump sum, completed to the satisfaction of the Engineer.

PART 5 BASIS OF PAYMENT

Payment of Mobilization/Demobilization shall be per lump sum. Payments as specified shall be considered full compensation for all labor, materials, equipment and incidentals necessary to perform the Work as required. The bid price for mobilization/demobilization shall not exceed five (5%) percent of the total bid price for the project.

No deduction will be made, nor will any increase be made, in the lump sum mobilization item amount regardless of decreases or increases in the final total contract amount or for any other cause.

Payment of the Mobilization item will not be made more than once, regardless of the fact that the Contractor may have, for any reason, shut the work down on the project or moved their equipment away from the project and then back again.

If an item for mobilization is not provided, the cost of mobilization, including the required insurance and bonds, will be incidental to the other items specified in the Contract Documents.

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3. CONSTRUCTION LAYOUT STAKING / AS-BUILT SURVEY

This item shall consist of furnishing, placing, and maintaining construction layout stakes necessary for the proper execution of the work under the Contract, all in accordance with these Specifications and an as-built survey before and after construction to determine cubic yardages of channel deposition excavation (cut) and channel embankment placement (fill) . It shall also consist of checking and making any field adjustment to the plan alignment, grades and elevations as considered necessary by the Owner or dictated by planned excavations. Demarcate (flag) the

Limit of Disturbance (LOD), and protected resources including, wetlands, wetland buffers, waters of the United

States, floodplains, and tree preservation areas.

PART 2 MATERIALS

2.1 PRODUCTS

A. Wooden surveying stakes (18”) shall be free from knots, rot, cross grain, or other defects that would impair their strength.

B. Hubs, batter boards, flagging, templates, straightedges and other devices necessary for laying out all parts of the work.

C. Computers and necessary software, paper, and other essentials media required for various submittals.

PART 3 EXECUTION

3.1 PREPARATION

No clearing or earth disturbance activity may begin until the LOD and all protected resources are demarcated as specified.

3.2 CONSTRUCTION

A. The Contractor will locate and reference the baseline and will establish bench marks along the line of the improvement for the proper layout of the work. The Contractor shall make all calculations involved and shall furnish and place all layout stakes. The Contractor shall provide field forces and shall set all additional stakes needed, such as offset stakes, reference point stakes, slope stakes, supplementary bench marks, and any other horizontal or vertical controls necessary to secure a correct layout of the work. The Contractor shall be responsible for having the layout staking work conform to the lines, grades, elevations, and dimensions called for on the Plans.

B. The Contractor shall furnish a copy of their survey records for checking by the Engineer and for the District's permanent file. These records shall be furnished as they are completed during the progress of the work. Any inspection or checking of the Contractor's layout by the Engineer and the acceptance of all or any part of it shall not relieve the Contractor of their responsibility to secure the proper dimensions, grades, and elevations of the several parts of the work.

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C. The Contractor shall exercise care in the preservation of stakes and bench marks and shall have them reset at their expense when any are damaged, lost, displaced or removed. The Contractor shall use competent personnel and suitable equipment for the layout work required.

3.3 AS-BUILT SURVEY

The contractor shall provide certified volumes for total excavation of channel disposition material of original grades and total fill placed for channel embankment repair. Volumes must be certified by a licensed Maryland Land

Surveyor or Engineer. Volume certification must accompany request for payment.

PART 4 METHOD OF MEASUREMENT

Measurement for Construction Layout Staking / As-built Survey shall be per lump sum, completed to the satisfaction of the Engineer.

PART 5 BASIS OF PAYMENT

Payment of Construction Layout Staking / As-built Survey shall be per lump sum. Payments as specified shall be considered full compensation for all labor, materials, equipment and incidentals necessary to perform the Work as required. Price and payment shall be full compensation for furnishing, setting, maintaining, and resetting, when necessary, the stakes, and for furnishing all engineering personnel, equipment, materials, and all incidentals. The total payment for construction layout stakes shall not exceed five percent (5%) of the total contract bid price.

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4. COMPOST FILTER SOCK (18”)

This item shall consist of all labor, materials and equipment for installation of erosion and sediment control Compost

Filter Sock.

PART 2 MATERIALS

Compost Filter Sock to be Filtrexx Siltsock or approved equivalent. Filter media fill to meet application requirements. Compost material to be dispersed on site as determined by engineer.

Compost material specifications shall conform to the following table taken from the 2011 Maryland Standards and

Specifications for Soil Erosion and Sediment Control.

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The above Table was adapted from AASHTO Standard Specs for Compost Filter Socks and EPA Example

Compost Filter Parameters.

1Recommended test methodologies are provided in Test Methods for the Examination of Composting and

Compost (TMEC, The US Composting Council.)

PART 3 EXECUTION

3.1 CONSTRUCTION

Prior to installation, clear all obstructions including rocks, clods, and debris greater than one inch that may interfere with proper function of compost filter sock. Fill sock netting uniformly with compost or other approved biodegradable material to desired length such that resulting logs do not deform. Install compost filter socks perpendicular to the flow direction and parallel to the slope with the beginning and end of the installation pointing slightly up the slope creating a “J” shape at each end to prevent bypass. For un-trenched installation, blow or hand place mulch or compost on the uphill side of the slope along log. Stake filter log every 4 feet or closer along entire length of log or trench log into ground a minimum of 4 inches and stake log every 8 feet or closer. Use stakes with a minimum nominal cross section of 2x2 inch and of sufficient length to attain a minimum of 12 inches into the ground and 3 inches protruding above log. When more than one log is needed, overlap ends 12 inches minimum and stake.

3.2 MAINTENANCE

Socks shall be inspected weekly and the next day after each rain event.

Accumulated sediment shall be removed when it reached half the aboveground height of the sock and redistributed on site. Biodegradable filter socks shall be replaced after 6 months, photodegradable socks after 1 year.

Polypropylene socks shall be replaced according to manufacturer’s recommendations. Upon stabilization of the

-22-area tributary to the sock, stakes shall be removed. The sock may be left in place and vegetated or removed. In the latter case, the mesh shall be cut open and the mulch spread as soil supplement.

Damaged socks shall be repaired according to manufacturer’s specifications or replaced within 24 hours of inspection. Replace compost filter sock if torn. Reinstall compost filter sock if undermining or dislodging occurs.

Replace clogged compost filter socks. For permanent applications, establish and continuously meet requirements for adequate vegetative establishment.

PART 4 METHOD OF MEASUREMENT

Measurement for Compost Filter Sock (18”) shall be per linear foot installed measured along the centerline of the product and installed to the satisfaction of the Engineer.

PART 5 BASIS OF PAYMENT

Payment for Compost Filter Sock (18”) shall be per linear foot installed. Payment as specified shall be considered full compensation for all labor, materials, equipment and incidentals necessary to perform the Work as required.

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5. STREAM DIVERSION PUMP-AROUND

This item shall consist of all labor, materials and equipment for installation of stream diversion pump-around.

Stream diversion pump-around will be required to redirect stream flow around work area during earthwork and structure activities within the stream channel. All pump-around operations shall conform to Maryland Guidelines to Waterway Construction (MGWC) 1.2: Pump-Around Practice.

PART 2 MATERIALS

This item shall consist of the pumps and associated material necessary to divert flow as well as dewater the instream work area.

Sand bag dikes with impervious sheeting will be necessary to isolate the work area. The sand bag dikes shall be constructed and installed as shown in the details of the plans.

The dewatering device shall consist of a filter bag meeting the requirements of the Geotextile Filter Bag detail in the plans. It shall be a nonwoven geotextile with double stitched seams using high strength thread. Size sleeve to accommodate a maximum 4” diameter pump discharge hose. See detail in plans for additional requirements.

Contractor to provide an appropriately sized velocity dissipater made of rip rap or sandbags at the outlet of the stream diversion discharge hose.

PART 3 EXECUTION

This item shall consist of the pumps and associated material necessary to divert flow as well as dewater the instream work area. Sediment control measures, pump-around practices, and associated channel and bank construction should be completed in the following sequence (refer to Pump Around detail in the plans):

1. Construction activities including the installation of erosion and sediment control measures should not begin until all necessary easements and/or right-of-ways have been acquired. All existing utilities should be marked in the field prior to construction. The contractor is responsible for any damage to existing utilities that may result from construction and should repair the damage at his/her own expense to the county’s or utility company’s satisfaction.

2. The contractor should notify the Maryland Department of the Environment sediment control inspector at least 5 days before beginning construction. Additionally, the contractor should inform the local environmental protection and resource management inspection and enforcement division and the provider of local utilities a minimum of 48 hours before starting construction.

3. The contractor should conduct a pre-construction meeting on site with the WMA sediment control inspector, the county project manager, and the engineer to review limits of disturbance, erosion and sediment control requirements, and the sequence of construction. The contractor should stake out all limits of disturbance prior to the pre-construction meeting so they may be reviewed. The participants will also designate the contractor’s staging areas and flag all trees within the limit of disturbance which will be

-24-removed for construction access. Trees should not be removed within the limit of disturbance without approval from AMLD/DGS.

4. Construction should not begin until all sediment and erosion control measures have been installed and approved by the engineer and the sediment control inspector. The contractor should stay within the limits of the disturbance as shown on the plans and minimize disturbance within the work area whenever possible.

5. Upon installation of all sediment control measures and approval by the sediment control inspector and the local environmental protection and resource management inspection and enforcement division, the contractor should begin work at the upstream section and proceed downstream beginning with the establishment of stabilized construction entrances. In some cases, work may begin downstream if appropriate. The sequence of construction must be followed unless the contractor gets written approval for deviations from the AMLD/DGS. The contractor should only begin work in an area which can be completed by the end of the day including grading adjacent to the channel. At the end of each work day, the work area must be stabilized and the pump around removed from the channel. Work should not be conducted in the channel during rain events.

6. Sandbag dikes should be situated at the upstream and downstream ends of the work area as shown on the plans, and stream flow should be pumped around the work area. The pump should discharge onto a stable velocity dissipater made of riprap or sandbags.

7. Water from the work area should be pumped to a sediment filtering measure such as a filter bag or other approved source. The filter bag shall conform to the requirements of the Geotextile Filter Bag detail in the plans. The measure should be located such that the water drains back into the channel below the downstream sandbag dike.

8. Traversing a channel reach with equipment within the work area where no work is proposed should be avoided. If equipment has to traverse such a reach for access to another area, then timber mats or similar measures should be used to minimize disturbance to the channel. Temporary stream crossings should be used only when necessary and only where noted on the plans or specified.

9. All stream restoration measures should be installed as indicated by the plans and all banks graded in accordance with the grading plans and typical cross- sections. All grading must be stabilized at the end of each day with seed and mulch or seed and matting as specified on the plans.

10. After an area is completed and stabilized, the clean water dike should be removed. After the first sediment flush, a new clean water dike should be established upstream from the old sediment dike. Finally, upon establishment of a new sediment dike below the old one, the old sediment dike should be removed.

11. A pump around must be installed on any tributary or storm drain outfall which contributes base flow to the work area. This should be accomplished by locating a sandbag dike at the downstream end of the tributary or storm drain outfall and pumping the stream flow around the work area. This water should discharge onto the same velocity dissipater used for the main stem pump around.

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12. If a tributary is to be restored, construction should take place on the tributary before work on the main stem reaches the tributary confluence. Construction in the tributary, including pump around practices, should follow the same sequence as for the main stem of the river or stream. When construction on the tributary is completed, work on the main stem should resume. Water from the tributary should continue to be pumped around the work area in the main stem.

13. The contractor is responsible for providing access to and maintaining all erosion and sediment control devices until the sediment control inspector approves their removal.

14. After construction, all disturbed areas should be regraded and revegetated as per the planting plan.

When the Contract Documents include details for the continuous maintenance of stream flow during construction, a Temporary Stream Crossing Permit is not required if the details in the Contract Documents are used and there is no other work in the waterways. A different plan for maintenance of stream flow may be submitted, but approval from the Engineer and a Temporary Stream Crossing Permit will be required. Temporary Stream Crossing Permits may be obtained from the Maryland Department of the Environment - Water Management Administration, Permits

Services Center.

The pump-around system shall be inspected once per hour during operation. Add additional material levels if pool behind cofferdam rises above bottom of uppermost level of material. Adjust and replace materials as inspection requires. Replace filter bag if bag clogs or has rips, tears, or punctures. During operation keep connection between pump hose and filter bag watertight. Replace bedding if it becomes displaced.

PART 4 METHOD OF MEASUREMENT

Measurement for Stream Diversion pump around shall be per each, installed to the satisfaction of the Engineer.

PART 5 BASIS OF PAYMENT

Payment of Stream Diversion Pump Around shall be per each. Payments as specified shall be considered full compensation for all labor, materials, equipment and incidentals necessary to perform the Work as required.

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6. STABILIZED CONSTRUCTION ENTRANCE

This item shall consist of all labor, materials and equipment for clearing and grubbing, unclassified excavation, bedding, fabric, and installation required for construction and maintenance of Stabilized Construction Entrance

(SCE). SCE shall be installed at the location shown on the plans as approved by MDE.

PART 2 MATERIALS

Aggregate for the stabilized construction entrance shall be 2 to 3 inch stone underlain with nonwoven geotextile. A pipe to route existing surface flows through the SCE may be required as needed.

Nonwoven geotextiles shall conform to the following table taken from the 2011 Maryland Standards and

1All numeric values except apparent opening size (AOS) represent minimum average roll values (MARV). MARV is calculated as the typical minus two standard deviations. MD is machine direction; CD is cross direction.

2Values for AOS represent the average maximum opening.

Geotextiles must be evaluated by the National Transportation Product Evaluation Program (NTPEP) and conform to the values in the table above. The geotextile must be inert to commonly encountered chemicals and hydrocarbons and must be rot and mildew resistant. The geotextile must be manufactured from fibers consisting of long chain synthetic polymers and composed of a minimum of 95 percent by weight of polyolefins or polyesters, and formed into a stable network so the filaments or yarns retain their dimensional stability relative to each other, including selvages. When more than one section of geotextile is necessary, overlap the sections by at least one foot. The geotextile must be pulled taut over the applied surface. Equipment must not run over exposed fabric. When placing riprap on geotextile, do not exceed a one foot drop height.

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PART 3 EXECUTION

3.1 Construction

SCE shall be installed per detail as shown on these plans and within these specifications. Place SCE in accordance with the approved plan. Vehicles must travel over the entire length of the SCE. The minimum length of the SCE is

50’ while the minimum width is 10’. Flare SCE 10’ minimum at the existing road to provide a turning radius. Pipe all surface water flowing to or diverted toward the SCE under the entrance, maintaining positive drainage. Protect pipe installed through the SCE with a mountable berm with 5:1 side slopes and a minimum of 12” of aggregate over the pipe. Pipe to be provided as needed. A mountable berm is not required when a pipe is not being used.

Prepare subgrade and place nonwoven geotextile on top of the prepared subgrade. Place crushed aggregate at least

6” deep over the length and width of the SCE.

The contractor shall determine if a pipe and mountable berm is needed to convey diverted flows across the SCE.

Remove stabilized construction entrances as soon as they are no longer needed to provide access to the site.