Western Branch Potable Water System Upgrades Summary of Work WSSC Contract No. CD6915B20 01110-1 December 2025

SECTION 01110

SUMMARY OF WORK

PART 1 GENERAL

1.1 DESCRIPTION

A. Section includes

1. Summary of work including work by the Commission, sequence of construction, Contractor use of Premises and special conditions for substantial completion

1.2 GENERAL REQUIREMENTS

A. Construction of the new Well House, Water line and connections to the Treatment Plant

Buildings, shall be accomplished without disruption of service to the Treatment Plant Buildings.

B. Connections to existing pipes and/or structures shall be scheduled and coordinated in advance with the Commission. It may be necessary to make connections during night hours or on weekends. No claim for extra compensation or extension of contract time will be allowed on account of the necessity for connections to be made during "off" hours.

Permission of the Commission shall be obtained by the Contractor prior to making any changes or connections to the existing system.

C. The Commission shall supply the process control equipment and perform the programming. The Contractor shall coordinate with the Engineer during the integration process.

1. For the integration, the Contractor shall provide a systems integrator to collaborate with the Commission during system integration. The integrator be submitted to the Engineer for approval.

D. When the Contractor desires certain valves functions to be interfaced, the Contractor shall inform the Commission, in writing, a minimum of sixty (60) days prior to the date the Contractor desires those interfaces to be made.

1.3 COMMISSION WORK SCHEDULE

A. The Commission observes a 5-day work week, Monday through Friday, 8 hours a day.

B. Holidays:

1. New Year's Day.

2. Martin Luther King's Birthday.

3. Presidents' Day.

4. Memorial Day.

5. Independence Day.

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6. Labor Day.

7. Columbus Day.

8. Veterans Day.

9. Thanksgiving Day and the following Friday.

10. Christmas Day.

11. State and National Election Days.

12. Inauguration Day.

C. Permission to Work.

1. Notify the Commission in writing, at least 8 hours before start of site activity.

2. Except as noted below, do no work requiring services of the Commission's inspection and supervisory forces for more than 8 hours a day nor on Commission holidays or weekends, unless authorized by the Commission in writing.

a. Clean up and other items for which no specific payment is involved may be performed on Saturdays and Holidays with Engineer's permission.

b. Request written permission of the Commission to work on Saturdays, Sundays, Holidays or longer than 8 hours per day in order to comply with construction schedule, or because of emergency.

1) Costs incurred by the Commission for overtime hours may be back-charged to the Contractor at the WSSC current published rate.

2) Minimum of 3 hours overtime per day will be charged for work on

Saturday, Sunday and holidays.

3. Do not work in roadways during peak vehicular traffic hours following jurisdictional restrictions and requirements contained elsewhere in Contract Documents.

4. If the Contractor receives written authorization from the Engineer to work outside the scope of normal working hours as described above, costs incurred by the Commission arising from such lengthening of hours including the furnishing of Inspectors, Resident Engineer, or Project Manager or others deemed necessary by the Engineer shall be the Contractor's responsibility and the cost thereof will be deducted from monies owed the Contractor. The following hourly rates will apply.

Contractor will pay other items at actual cost.

a. Civil Inspector $199.50

b. Electrical Inspector $212.82

c. Mechanical Inspector $212.82

d. Project Manager $200.00

e. Resident Engineer $165.00

1.4 REFERENCE DOCUMENTS

A. Applicable Codes, Specifications and Standards.

1. References to codes, specifications, and standards in Contract Documents are to the latest edition, amendment, and/or revision of reference standard in effect on date of Bid Opening.

WSSC Contract No. CD6915B20 01110-3 December 2025

B. Documents on Site.

1. Maintain on site, copies of appropriate documents, including codes, specifications, permits, and reference standards named in Contract Documents.

C. Electronic Documentation.

1. Use e-builder for submitting, storing and reviewing electronic documentation.

1.5 COMMISSION RESPONSIBILITIES

A. Land Acquisition, Rights-of-Way, and Permits:

1. The Commission has:

a. Secured land and right-of-way necessary for carrying out and completing

Contract Work. Easements have been obtained by the Commission as shown in the Drawings.

b. Obtained permits for construction listed on Drawings, except for the Erosion and Sediment Control Permit for Utility Construction, which is issued directly to the Contractor as stated elsewhere in the Contract Documents.

1) A copy of each permit will be provided by the Commission and shall be available at the construction site.

2. The Commission will establish an e-builder account to be used and assign representatives.

1.6 ABBREVIATIONS AND SYMBOLS

A. Abbreviations used for technical society, institution, association, or governmental authority references in Specifications:

Abbreviations and Symbols AA Aluminum Association AAMA Architectural Aluminum Manufacturer's Association AAN American Association of Nurserymen AAR Association of American Railroads AASHTO American Association of State Highway and Transportation Officials ACI American Concrete Institute ACPA American Concrete Pipe Association ADA Americans with Disabilities Act AGA American Gas Association AGMA American Gear Manufacturer's Association AI Asphalt Institute AIA American Institute of Architects AISC American Institute of Steel Construction AISI American Iron and Steel Institute ALS American Lumber Standards ANSI American National Standards Institute APA American Plywood Association AREMA American Railway Engineering and Maintenance-of-Way

Association

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ASA American Standards Association, Inc.

ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials AWG American Wire Gauge AWPA American Wood Preservers Association AWPI American Wood Preservers Institute AWS American Welding Society AWWA American Water Works Association BOCA Buildings Officials Code Administration International, Inc.

CRSI Concrete Reinforcing Steel Institute DEP Department of Environmental Protection (Montgomery County) DNR Department of Natural Resources DIPRA Ductile Iron Pipe Research Association EPA Environmental Protection Agency (Federal) FS Federal Specifications or Federal Standards ICEA Insulated Cable Engineers Association IEEE Institute for Electrical & Electronic Engineers IES Illuminating Engineering Society of North America ISA Instrument Society of America MBMA Metal Building Manufacturers Association Standards MCDPWT Montgomery County Department of Public Works and Transportation MDE Maryland Department of the Environment MDOT Maryland Department of Transportation MIL Military Specifications MNCP&PC Maryland National Capital Park and Planning Commission MOSH Maryland Occupational Safety and Health MPS Maryland Park Service MSCS Maryland Soil Conservation Service MSHA Maryland Department of Transportation State Highway

Administration NACE NACE International (Formerly, National Association of Corrosion

Engineers) NAPCA National Association of Pipe Coating Applicators NBFU National Board of Fire Underwriters NEC National Electrical Code NEMA National Electrical Manufacturer's Association NESC National Electric Safety Code NETA National Electric Testing Association, Inc.

NFC National Fire Code NFPA National Fire Protection Association NIST National Institute of Standards and Technology NPS National Park Service NSF NSF International (Formerly, National Sanitation Foundation) OSHA Occupational Safety and Health Administration

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PCA Portland Cement Association SCS Soil Conservation Service SDR Standard Dimensional Ratio SSPC Steel Structure Painting Council UBC Uniform Building Code, International Conference of Building

Officials ULI Underwriter's Laboratories Incorporated USSG United State Standard Gauge USSWG United States Steel Wire Gauge WSSC Washington Suburban Sanitary Commission

1.7 CONTRACTOR RESPONSIBILITIES

A. Use of Premises and Offsite Work.

1. Lands by Contractor.

a. Permits and approvals shall specify treatment of said areas during and at completion of construction.

b. Furnish copies of permits and approvals to the Commission before using areas.

c. Obtain staging area(s) and mobilize equipment and materials to and from staging area(s) at no additional cost to the Commission.

d. See Sections 01500 and 01570 for securing additional grading and sediment control permits.

2. Private Property.

a. Do not enter upon private property for any purpose without obtaining written permission from property owner.

b. File letters of permission from property owners with Engineer before entering private property.

3. Public Utility Easement (PUE): Not entered upon unless a concurrent WSSC water and sewer easement and Work are shown on Drawings.

B. Existing Structures: Not loaded with weights that will endanger structure, nor endanger any part of Work due to stresses or pressures.

C. Public Convenience.

1. Conduct work to ensure least possible obstruction to traffic and inconvenience to the Commission, general public, and residents in vicinity of Work, and to ensure the protection of persons and property.

2. Keep fire hydrants on or adjacent to Work, accessible to fire fighting equipment.

3. Make temporary provisions to ensure use of sidewalks and proper functioning of gutters, stormwater systems, drainage ditches, and culverts, and keep them free of obstructions.

4. See Traffic Control Plan and drawings.

D. Explosives:

1. Explosives are not anticipated and shall not be used for this project..

WSSC Contract No. CD6915B20 01110-6 December 2025

E. Dimensions at points of connection: Verified by actual field measurements. Before beginning work;

1. Perform test pits at each point of connection.

2. Refer discrepancies between Contract Documents and existing conditions to

Engineer.

F. Pre-Construction Photography.

1. Submit prior to beginning any Work that may cause site disturbance.

a. Digital date-stamped color photography provided in CD disc format or uploaded to E-Builder.

1) Photographs: Taken by competent photographer.

a) Take at sufficient intervals to fully document the pre-construction conditions of the work site, not more than 100 feet apart along the street and/or right of way.

b) Include identification markers such as houses, businesses, signs, property numbers, mail boxes, or landscaping, in each view to properly confirm location of the view for ease of identification.

c) Devote particular attention of pre-existing damage to streets, curbs, sidewalks, driveways, signs, mailboxes, retaining walls, landscaping, etc.

2) Submit Photo log along with CD disc that provides;

a) Name and number of the contract.

b) Name of Contractor.

c) Name of photographer.

d) Include for each photograph;

File name Date taken Location of the view

G. Pre-Construction Video.

1. Document by video, and submit in digital format on DVD or upload to e-builder;

a. All pre-existing site conditions adjacent to and within the limits of construction.

b. Clear and continuous view of the project alignment.

2. Submit prior to beginning Work that may cause site disturbance.

H. Public Notification.

1. Deliver written notices to each home or business 48 hours prior to commencement of work being conducted, including a local telephone number for inquiries or complaints.

2. Provide owner or occupant with summary of work to be completed, and time and duration of service interruption to building.

3. Contact any home or business that cannot be reconnected within time stated in written notice.

4. Submit via e-builder copies of all delivered notices.

WSSC Contract No. CD6915B20 01110-7 December 2025

I. Sequence of Construction

1. See Contract Drawings for sequence of construction.

2. When permanent paving patches are within the scope of the project:

a. Include placement of new paving (permanent patch) in the overall construction schedule.

b. Unless otherwise noted in the Contract Documents, no more than 1 mile of paved area may be disturbed or repaired with temporary patch at any one time.

c. For long trenches, daily placement of asphalt patches shall not be included as part of the permanent patch

d. Protect new paving from damage due to construction activities.

e. Provide signage that states no construction equipment will be allowed on the new paving.

f. The Contractor shall repair paving damaged by construction activities within

72 hours and at no expense to the Commission.

1) Document at the end of each workday, the condition of the new paving.

J. Water Line Shutdown Coordination

1. The Contractor shall notify Commission sixty (60) days prior to need for shutdown of existing water mains. The Commission will shutdown the water mains and provide dewatering. The Contractor will be responsible for dewatering any water remaining the low points of the pipe sections.

2. The Contractor shall notify the Commission when work requiring the shutdown is complete in order for the Commission to place the water line back in service.

1.8 CONSTRUCTION STAKEOUT BY CONTRACTOR

A. The Commission will or has established baselines, benchmarks or other necessary control points for the Contractor's use.

1. Perform stakeout from Commission-furnished control points (traverse, property lines and corners, and benchmarks) and employ qualified and experienced personnel to provide stakeout.

2. Furnish certification of competency and qualifications of employees to Engineer before commencing with Work.

B. Preserve and maintain in proper position survey points, benchmarks, and baselines provided by the Commission.

1. Retain Professional Surveyor licensed to practice in State of Maryland to reset points disturbed by Contractor's employees, equipment or neglect to give them proper protection, or Engineer may arrange for resetting points with Commission Survey Party and deduct costs from monies due Contractor.

C. Notify Engineer of any construction stakeout deviations from Drawings.

1. Discrepancies will be resolved under Engineer's direction before proceeding with Work.

D. For pipeline construction:

1. Stakeout test pits and furnish the Commission with actual utility locations and elevations, or as otherwise directed by the Commission.

WSSC Contract No. CD6915B20 01110-8 December 2025

2. Stakeout centerlines and offset lines with spacing of stations maximum of 50 feet (stakes, nails, crosses).

3. Stakeout intermediate points (P.C., P.T., structures, fittings, end of lines, and topographic changes) and as deemed necessary by the Commission.

4. Submit grade sheets showing for each station the marked point elevation, invert elevation required and corresponding cut for both centerline and appropriate offset.

a. Each set of notes shall check within plus or minus 0.04 feet.

b. Use Contractor's Construction Stake Out Record form. See Detail M/10.0.

5. Flag stakes for protection to aid in their preservation and maintenance.

6. Perform other engineering and stakeout necessary for setting of batter boards, forms, string lines, and finished grade control, slope stakes and other controls which may be required for proper construction of Work.

E. Construction shall not begin until the Commission has received and signed grade sheets and has received 2 copies of notes.

1. Work done without lines and grades or without written approval of the Commission will not be estimated or paid for and may be ordered removed and replaced at no cost to the Commission.

1.9 PROJECT PROGRESS MEETINGS

A. Project progress meetings will be held periodically to allow Engineer to review Project status.

1. Contractor's superintendent shall attend meeting and accompany Engineer on inspection of Project site.

1.10 INTERPRETATION OF QUANTITIES

A. Quantities appearing in Bid Schedule are approximate only.

1. Payment to Contractor will be made only for actual quantities of work performed or materials furnished following Contract.

2. Where actual quantity of pay item varies more than 25 percent above or below estimated quantity stated in Contract, an equitable adjustment will be considered upon request of either party.

3. Adjustment: Based upon any increase or decrease in unit costs due solely to variation above 125 percent or below 75 percent of estimated quantity.

a. This adjustment shall only be applied to the quantity above 125 percent or below 75 percent of estimated quantity.

b. If quantity variation causes an increase in time necessary for completion, Engineer will, upon receipt of written request for extension of time, ascertain facts and make adjustment for extending completion date, as in his judgement the findings justify.

B. The 25 percent above or below estimated quantities does not apply to fixed unit price contingent items.

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1.11 LUMP SUM ITEMS

A. All work required by the Contract Documents except for contingent items will be paid for by Lump Sum item as provided in the Bid Schedule.

1.12 CONTINGENT ITEMS

A. Refer to Section 01270 for a list of contingent items. All contingent items are measured and paid per Section 01270.

B. Fixed quantity and unit price contingent items listed in Bid Schedule do not necessarily occur on Drawings.

C. During course of Work, Engineer may direct incorporation of any or all of these items.

D. Payment to Contractor in this case will be for quantities directed by Engineer and computed following Contract Documents based on unit prices listed in Bid Schedule.

1.13 INCIDENTAL ITEMS

A. When no item is provided in Bid Schedule, no measurement and payment will be made, but the cost thereof considered incidental.

1.14 ARCHAEOLOGICAL ARTIFACTS AND HUMAN REMAINS

A. Articles of historical or scientific value, including coins, fossils, and articles of antiquity, which may be uncovered or otherwise brought to attention of Contractor during course of Contract shall remain property of Owner of property on which articles reside.

1. Report findings immediately to Engineer who will determine method of removal, where necessary.

1.15 ASBESTOS-BEARING ROCK

A. Use of asbestos-bearing rock as an unbound surfacing material on roads, sidewalks, parking lots, road shoulders, trails, and other areas subject to traffic, vehicular or pedestrian, is prohibited.

B. Health and Safety of Workers, Commission Employees, and the Environment: Following applicable Federal, State, and local laws and regulations including, but not limited to 29 C.F.R. 1910.1001, 29 C.F.R. 1926.1101, 40 C.F.R. 61 subpart m, 40 C.F.R. 302, 49.

C. C.F.R. 171, 49 C.F.R. 172, and COMAR 26.11.21 Et Seq.

WSSC Contract No. CD6915B20 01110-10 December 2025

D. Secure services to ensure compliance with all applicable Federal, State and local laws and regulations.

1. Environmental Consultants and Contractors, Inc.

2. Apex Environmental, Inc.

3. Or equal.

E. Practice effective dust control at all times.

1. Use water suppression techniques to control dust as it is generated during construction.

2. Keep excavated rock wet during operations that may generate dust, including, but not limited to blasting, excavations, loading, and hauling of rock.

PART 2 PRODUCTS

(NOT USED)

PART 3 EXECUTION

END OF SECTION

Western Branch Potable Water System Upgrades Site Conditions WSSC Contract No. CD6915B20 01150-1 December 2025

SECTION 01150

SITE CONDITIONS

A. Section includes general requirements relating to site conditions and responsibility for existing utilities, structures, and facilities.

1.2 EXISTING UTILITIES

A. General.

1. Existing utility structures and appurtenances are shown following best available information.

2. The Commission will not be responsible for completeness or accuracy thereof nor for any deductions, interpretations, or conclusions drawn there from.

3. Notify Miss Utility 48 hours in advance of work in vicinity of existing utility structures and appurtenances and verify by test pit or other means actual locations of existing utility structures and appurtenances before construction in their vicinity.

4. Support and protect utility structures and appurtenances following Drawings and Owner's requirements and take other steps necessary to protect structures from disturbance or damage.

5. Support and protect utility structures and appurtenances known, but not shown on Drawings, which occupy same space as facility to be constructed at no additional cost to the Commission.

6. Notify Utility Owner and Engineer immediately when previously unknown or different underground utility structures or appurtenances are encountered and take necessary precautions to support and protect utility.

7. Relocations or temporary protection arranged by or for convenience of Contractor will be at no additional cost to the Commission.

8. Removal or relocation of existing utility structures and appurtenances that physically occupy same space as facility, structure, or pipeline to be constructed are at no cost to Contractor.

a. Cost will be paid for as set forth in General Conditions, Article 14.

9. Fulfill requests from public utility corporations, jurisdictional agencies, or other owners to adjust public utility structures and appurtenances within or adjacent to limits of construction.

a. Furnish copies of requests and replies thereto to Engineer, and coordinate activities with utility.

b. Additional cost or time extension incurred resulting from lack of coordination with utilities will be at no additional cost to the Commission.

Western Branch Potable Water System Upgrades Site Conditions WSSC Contract No. CD6915B20 01150-2 December 2025

10. Any costs incurred as result of damage to incorrectly marked existing utility structure or appurtenances are to be resolved with Owner of damaged utility and not the responsibility of the Commission.

11. Repair damage to utility structures or appurtenances shown on Drawings or otherwise known.

a. Restore damaged utility structures and appurtenances as near as practicable to their original condition to the Engineer's or utilities' approval, at no additional cost to the Commission.

B. Relocations by Others: Coordinated with construction schedules of others performing relocations of existing utilities to avoid delay in Work.

C. Access to Utilities: Permit free and clear access to existing utility structures and appurtenances, including Commission sites, by personnel of Utility Owners or Operators, for inspection, maintenance, providing additional service, and construction of new utilities.

1. Maintain and protect utility structures and appurtenances at all times.

1.3 OTHER EXISTING IMPROVEMENTS, STRUCTURES, AND FACILITIES

A. Locate, protect and maintain, or remove and restore, existing improvements, structures, and facilities within and adjacent to Construction area whether shown on drawings, unless Engineer directs otherwise.

B. Trees and Shrubberies: Protect from damage.

1. If damaged, replace or repair damage, under Engineer's direction, at no cost to the Commission.

C. Property Survey Pipes, Stones, and Monuments: Protect and if required, replace using Professional Surveyor licensed to practice in State of Maryland, at no cost to the Commission.

D. Fences, Curbs, Gutters, Walkways, Driveways, Driveway Aprons and Flagstone:

Remove and replace in original position or at Engineer's direction.

1. Replace, in kind, those damaged, at no cost to the Commission.

Western Branch Potable Water System Upgrades Measurement & Payment WSSC Contract No. CD6915B20 01270-1 December 2025

SECTION 01270

MEASUREMENT AND PAYMENT

PART 1 GENERAL

BASIS FOR MEASUREMENT AND PAYMENT

A. Measurement and Payment will be made for only those items included in the Bid Schedule or Contract Change Order(s) for the Project.

B. All measurement for payment will be for completed work performed according to Contract Drawings, Specifications, and the Form of Bid. The Commission shall measure all work according to the methods outlined below.

C. Payment for any item is full compensation for furnishing all labor, materials, equipment, installation, tools, testing, fittings, accessories, and incidental items required to provide a complete and operable item of the work.

D. Mobilization and demobilization shall be included in the lump sum items cost.

E. Where units differ between the items listed in Part 2 Products below and the Form of Bid, the Form of Bid governs.

F. Removal: All items in the Form of Bid requiring removal shall include the removal from the site as well as the proper disposal in accordance with applicable regulations.

G. Incidental Items: All costs for work implied or detailed in the Contract Documents for which there are no specific bid items are to be included in other appropriate items.

H. Non-Payment Items: All cost for work implied or detailed in the plans, supplemental/special conditions, approved shop drawings and Contract Documents for which there are no specific bid items are to be considered incidental to the work and shall be included in the Form of Bid to which the work pertains. No separate payment will be made to the contractor.

I. Contingent Items: Authorization from the Commission is required prior to installation of contingent items below.

PAYMENT FOR MATERIAL STORED OFF SITE

A. For purposes of administering this provision, the following definitions are provided.

1. Material stored NEAR the Work Site: A storage location shall be considered near the work site if it is not more than fifty (50) miles (approximately one hour drive) from the work.

2. Material stored DISTANT from the Work Site: Locations beyond the limit of fifty (50) miles shall be considered distant.

WSSC Contract No. CD6915B20 01270-2 December 2025

B. All proposed off site locations, regardless of whether they are near or distant, shall be approved by the Commission prior to any payment. The approval process will include an inspection of the proposed storage site, which may or may not coincide with any inspection of materials stored.

C. Prior to payment for any material stored off site, said material shall be inspected to verify that it is properly stored, i.e., segregated, inventoried, identified as the property of the Commission. This material shall be clearly identified and physically segregated from any other material or stock, in such a manner that it is clear from casual observation that said material is not a part of any other stock or stored material.

D. For materials stored distant to the Work site, the Contractor shall reimburse the Commission for all reasonable costs incurred by the Commission, to include but not limited to salary, transportation, lodging and per diem, for the Commission's or the Engineer's employees to travel to and from the storage locations for the purpose of verifying the material is properly stored. It is anticipated that such trips would occur whenever additional material is claimed for payment and/or at least every six (6) months until the material is delivered to the work site.

E. Except for unusual circumstances, the Contractor will not be required to reimburse the Commission's costs for visits to storage locations near the work site.

F. The Contractor shall hold the Commission harmless from any and all losses, additional costs, direct or indirect damages and/or delays, whatsoever, which may occur as a result of a failure of the Contractor to deliver (or have delivered), in a timely manner, materials (for which payment has been made) to the work site for installation and incorporation into the Work.

G. The Contractor shall provide to the Commission, a Release of Lien or other suitable certification by the Seller, in addition to paid invoices, verifying that the Contractor has valid title to all materials for which payment is requested. The Seller, however, shall not be required to waive his rights for recovery, if his contract is breached.

H. The Contractor shall furnish proof of insurance (in addition to any other insurance that may be required by or as a result of the Contract) that covers the stored material from loss by theft, fire, vandalism and extended coverage perils, at the location stored, in an amount equal to one hundred percent (100%) of the replacement value of the material stored.

ELECTRONIC PAYMENT PROCESS

A.

recommended that the contractor take advantage of electronic direct deposit of the payment even if the payment application is submitted in hard copies.

WSSC Contract No. CD6915B20 01270-3 December 2025

PART 2 MATERIALS

UNIT PRICE ITEMS

A. Work required by the Contract Documents except for contingent items will be paid for by unit price item as provided in the Bid Schedule.

CONTINGENT ITEMS

A. Borrow Excavation Of Suitable Soils, Installed

1. Measurement: This work will be performed as per Section 02315 of the specification and special provisions and will be paid in cubic yards.

2. Payment: Borrow excavation will also include grading, shaping slopes, channels, swales, and other excavations. It will be paid in cubic yard based upon the computed in place quantity using existing and proposed contours.

B. Undercut And Dispose Of Unsuitable Soils

1. This work will be performed under the conditions as described in Section 02315 of the specifications and special provisions. Due to over saturation the excavated material will be hauled in sealed trucks. Also, the hauling trucks will be cleaned before leaving the site as necessary to prevent the tracking of sediment into the County right of way.

2. Payment: This item will be paid in cubic yard based upon the computed in place quantity using field measurements or existing and proposed contours.

C. Fill/Select Material Installed

1. Measurement: Compacted aggregate backfill as described in Section 02315 will be measured by the cubic yard of material placed.

2. Payment: Select backfill will be paid at the contract unit price per cubic yard for aggregate backfill and shall include all materials, equipment, and labor required to furnish and compact, complete in place.

D. Rock Excavation

1. Measurement: The rock excavation and disposal will be determined and performed as per Section 02315 of the specifications without blasting.

2. Payment: This item will be paid in cubic yard based upon the computed in place quantity using field measurements or existing and proposed contours.

E. Gravel And Sand For Various Purposes

1. Measurement: Gravel and sand for various purposes will be measured by the ton of material placed.

2. Payment: Gravel and sand for various purposes will be paid at the contract unit price per ton for aggregate backfill and shall include all materials, equipment, and labor required to furnish and compact, complete in place.

F. Field Adjustments of Erosion and Sediment Control Practices

1. Measurement: All field adjustments of silt fence, super silt fence, and/or filter logs will be measured by linear foot, when directed by the Engineer.

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2. Payment: The payment for field adjustments of silt fence, super silt fence, and/or filter logs, when directed by the Engineer will be at the fixed contingent contract unit price per linear foot. The price shall include all materials, labor, equipment, tools and incidentals to complete, maintain, and remove all field adjusted erosion and sediment control measures as specified in the Contract Documents, or as directed by the Commission.

G. Test Pit

1. Measurement: The Contractor has the responsibility to determine pipe material, pipe inside and outside diameter, thickness and location of adjacent pipe joints to existing pipes prior to starting Work for pipe connections. Test pit shall be performed prior to connecting proposed pipe to existing pipe and abandoning existing pipe fittings. The test pits shall be considered incidental to the water main work and will not be measured separately.

2. Payment: No separate payment will be made for test pits. All costs associated with the test pits, including all excavation, tamped backfill, and all material, labor, equipment, tools and incidentals necessary to complete the work, shall be incidental to the water main bid item. Any pavement to be replaced will be incidental to the asphalt pavement restoration bid item.

H. Concrete Sidewalk

1. Measurement: Concrete sidewalk per Section 02950 shall include the removal and replacement to include but not limited to excavation, grading to a satisfactory section, compaction of subgrade, entrance, forming, pouring, tinting and finishing of concrete and clean up.

2. Payment: Payment will be made at the unit price per square yard. grading to a satisfactory section, compaction of subgrade, entrance, forming, pouring, tinting and finishing of concrete and clean up. Payment to replace existing sidewalk will be made at the unit price per square yard.

I. Concrete Curb and Gutter

1. Measurement: Concrete curb and gutter per Section 02950 shall include the removal and replacement to include but not limited to excavation, grading to a satisfactory section, compaction of subgrade, entrance, forming, pouring, tinting and finishing of concrete and clean up.

2. Payment: Payment will be made at the unit price per linear feet.

J. Asphalt Concrete Pavement

1. Measurement: Asphalt concrete pavement per Section 02950 shall be measured in square yards (tons for variable depth) of the type specified as evidenced by plant delivery tickets. For all overlays, field measurements and calculations will be made also for use as a comparison between estimated and actual quantity used. Measurement for new roadways will be based on plan quantities and field measurement, not quantity tickets.

WSSC Contract No. CD6915B20 01270-5 December 2025

2. Payment: Asphalt concrete pavement will be paid at the contract unit price bid per square yards (tons for variable depth) for the type of Asphalt concrete specified. This price shall be full compensation for asphalt concrete pavement, complete in place, including all materials, labor, tools, equipment, tack coat, all other incidentals necessary.

K. Mill And Overlay

1. Measurement: Mill and overlay shall be measured by square yards of material milled 2 inches deep and asphalt overlay installed.

2. Payment: Mill and overlay shall be paid at the contract unit price per square yard of 2 inches deep and asphalt overlay. This price shall include all labor incidentals, materials, maintenance of traffic for removal and disposal of existing pavement as well as overlay of base course in accordance with Prince complete the work as specified.

L. Contingent 100 Pound Weight Fittings

1. Description:

a. This item consists of furnishing and installing various sizes of ductile iron pipe fittings with restrained joints, measured by hundred-pound weight (CWT), to accommodate unforeseen field conditions encountered during water main construction.

b. These fittings are used where field modifications are required due to unmarked or unknown utilities that alter the horizontal or vertical alignment of the proposed water main.

c. This item is not applicable to fittings or appurtenances required to resolve conflicts with utilities that are already shown in the Contract Documents.

2. Measurement:

a. Unit of measure for Extra Fittings will be by the hundred pound (CWT) complete in place, as determined from the nominal tabulated weight of each fitting per ANSI/ AWWA C153 (the weight of the fitting before the application of any lining or coating other than standard coatings).

b. Weight of retainer glands, bolts, nuts and gaskets will not be measured.

The weight of any fitting shall not be less than the nominal tabulated weight by more than ten percent (10%). No separate vertical or horizontal measurement will be made for Extra Fittings.

WSSC Contract No. CD6915B20 01270-6 December 2025

3. Payment: The unit price Bid per hundred pound weight shall be made at each and includes all materials; labor; tools; equipment; hauling; hand and mechanical excavation to planned trench subgrade; excavation for bell holes;

sheeting and/or shoring; pumping; stone or gravel cradle; backfilling, rehandling of material; removal and disposal of unsuitable material;

compacting; concrete thrust collars and buttresses; coatings; chlorinating;

testing; maintaining service; and all incidentals necessary to complete these items of Work.

M. Allowance For Unanticipated Additional Work

1. Description:

a. The work covered by this Section includes the furnishing of all tools, materials, equipment and the performance of all labor to complete any unanticipated additional work clearly outside the scope of the Contract Documents or as directed by the Engineer.

b. The unanticipated additional work is not included elsewhere in the scope of any other unit price or lump sum item on the Proposal Form. This includes hidden or unforeseen site conditions, and approved extra work required by the Engineer after award of the contract, which was not intentionally withheld prior to contract advertisement.

c. This contingency allowance is for the exclusive use of the City and is to be distributed at its sole discretion.

d. Any work to be performed under this Section shall be approved in writing and shall be authorized at the discretion of the Engineer. The Contractor shall submit the cost proposal for additional work, not covered by the bid items in this proposal/Contract, for approval by the Engineer.

e. Any authorized additional work shall not include any extension of time to complete the contract, except as separately approved in writing by the Engineer.

2. Measurement: After receiving the request for unanticipated additional work from the Engineer, which will outline the scope of work to be done, the Contractor shall submit a price proposal to the Engineer. This price proposal shall include estimated quantities, unit prices and lump sum prices for those items not already included in the Proposal Form. If the Contractor and the Engineer cannot successfully negotiate the cost for the unanticipated additional work, then the Engineer may direct the Contractor to perform the work on a Force Account basis in accordance with the Pipeline Construction General Conditions, latest revision.

WSSC Contract No. CD6915B20 01270-7 December 2025

3. Payment:

shall be made from Item No. B-13 for which the WSSC has established an estimated budget/ upset limit of $350,000.

WSSC Contract No. CD6915B20 01270-8 December 2025

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Western Branch Potable Water System Upgrades Construction Schedule CPM WSSC Contract No. CD6915B20 01320-1 December 2025

SECTION 01320

CONSTRUCTION SCHEDULE - CRITICAL PATH METHOD (CPM)

1.1 SCOPE

A. Contractor shall prepare and maintain a preliminary schedule herein referred to as the to as the "Complete Detailed Construction Schedule" as described below. These schedules shall be the Contractor's working schedules and used to plan, organize, and execute the Work. Contractor shall record and report actual performance and progress on a monthly basis, and show how the Contractor plans to complete all remaining Work as of the end of each progress report period.

B. The Preliminary Construction Schedule shall be maintained until the Complete Detailed

Construction Schedule is accepted by the Engineer. Each schedule submittal, including updates, shall include three (3) hard copies and be posted on e-Builder.

C. The Complete Detailed Construction Schedule shall be in the form of a network analysis

Professional R16.2, and shall show activities required for complete performance of items of Work. Each submittal, including updates, shall include three (3) hard copies of the schedule. In addition, the XER file shall be posted on e-Builder.

1.2 QUALIFICATIONS

Contractor shall submit for approval prior to submission of the Preliminary Construction Schedule, the resume of the scheduler they intend to use for developing and updating the schedule. If Contractor intends to engage a firm that specializes in the development and tions & experience statement for approval prior to submission of the Preliminary Construction Schedule. The Scheduler or firm shall have a minimum of five (5) years experience scheduling, updating, and monitoring CPM construction schedules.

PART 2 - PRODUCTS

WSSC Contract No. CD6915B20 01320-2 December 2025

PART 3 - EXECUTION

3.1 SCHEDULE SUBMITTAL REQUIREMENTS

A. Preliminary Construction Schedule

Within fifteen (15) days after the Contract start date set forth in the Notice to Proceed (NTP), submit to the Engineer for review:

1. A Preliminary Construction Schedule in time scale format indicating planned

Contractor operations during the first 120 days. Cost of activities and/or Project Deliverables expected to be completed or partially completed before submission and acceptance (by the Engineer) of the Complete Detailed Construction Schedule shall be included.

2. A preliminary Work Breakdown Structure (WBS). A hierarchy that represents the Work required to finish the project. The lowest level of the WBS shall have activities and deliverables.

B. Complete Detailed Construction Schedule

1. General

a. Within sixty (60) days after the Contract start date set forth in the Notice to Proceed, submit the Complete Detailed Construction Schedule (CDCS) for the complete detailed Critical Path Method (CPM) schedule showing usage of the entire Contract Time provided in the Contract. The mutually accepted schedule, unless subsequently changed with the concurrence of or at the direction of the Engineer, shall be the Contractor's working schedule and shall be used to plan, organize and execute the Work; record and report the actual performance and progress; and forecast remaining Work for the duration of the Contract.

Additionally, the mutually accepted schedule shall be the basis for determining progress payments to the Contractor.

b. The Schedule shall consist of diagrams, accompanying mathematical analyses including tabular reports and narratives as specified herein.

c. Contractor shall schedule the Work such that any specified intermediate milestone dates and completion dates are met as specified in the Contract Documents.

2. Construction Sequencing and Constraints a.

for each activity. Activities shall be developed in sufficient detail to identify impacts to existing pipelines and/or facilities. The schedule shall include a detailed list of all expected shutdowns with shutdown duration specifically shown.

1) All work requiring shutdown shall be coordinated with the Commission prior to beginning any work.

2) Materials and equipment to be used during shut down shall be on site and readily available prior to starting work in the shutdown limits.

WSSC Contract No. CD6915B20 01320-3 December 2025 b.

determine when lane closures along Aragona Boulevard are permitted.

3. Critical Path Method Detailed Network Diagram

a. A Schedule Network Diagram using the Precedence Network Diagram (PDM) method shall be provided. This diagram shall be provided in electronic pdf format that will be legible .

b. In the Schedule Network Diagram, Contractor shall provide sufficient detail and clarity of form and technique so that the Work can be properly controlled and so that the Engineer can readily monitor and follow progress of the Work. The diagram shall comply with the various limits imposed by the Contract Documents including but not limited to contractually specified intermediate milestone dates and completion dates showing use of the entire Contract Time.

The degree of detail shall be generally determined by the following outline:

1) The Work Breakdown Structure of the project.

2) The types of work to be performed and the labor trades involved including but not limited to the following examples: fitting, welding, piping installation, electrical, painting, testing, etc.

3) Submittal preparation, submittal review, procurement, fabrication, delivery, installation and test activities for major materials and equipment.

c. Activity durations shall not be in excess of 20 working days except in the case of non-construction activities such as procurement of materials or delivery of equipment. Durations shall be the result of definitive manpower and resource planning under contractually defined onsite work conditions and shall be shown in units of whole working days. Contractor shall allow durations as set forth in this Section for WSSC review and approval of Contractor submittals. No imposed dates, other than those dates contained in the Contract Documents will be allowed.

d. Contractor shall plot the network diagram to show a continuous flow from left to right. The critical path(s) shall be clearly and prominently identified.

Activity descriptions will be clear and will allow for definitive geographical start and completion boundaries in order to facilitate progress reporting.

e. Contractor shall provide supplementary written information sufficient to describe the construction methods to be used and the Activity Resource Requirements including resource restraints and other factors considered in the preparation of the network diagram in order to facilitate the Engineer's understanding.

f. Only Finish to Start relationships will be allowed unless a narrative description is attached to explain the logical necessity of any other relationship used in the schedule. This must receive the approval of the Engineer. No Start to Finish relationships will be allowed.

g. No Lags or Leads will be allowed unless a narrative description is attached to explain the logical necessity of any Lag or Lead used in the schedule. This must receive the approval of the Engineer.

WSSC Contract No. CD6915B20 01320-4 December 2025

4. Computerized CPM System

a. The network activities of the detailed schedule diagram shall be processed by the computerized CPM scheduling system to show, as a minimum, the following data:

1) Activity number.

2) Activity description.

3) Schedule duration for each activity in work days.

4) Early start, early finish, late start, late finish, actual start and actual finish

(by date).

5) Total float (positive and negative).

6) Original duration, activity percent complete, and remaining duration.

7) Activity cost value.

8) Manpower (by trade) and equipment resources planned for each activity.

a) Manpower shall be listed on a single person basis. Crews will not be accepted.

b) Equipment shall be listed by individual piece of equipment.

9) Responsibility Code for each activity.

b. As a minimum, the following computer-produced report sorts of the activity data (as previously noted) shall be supplied with clear identification of same on the first page of each report:

1) Activity Report: Activity number sort by ascending number.

2) Predecessor/Successor Report (Logic Report): A listing of Preceding and

Succeeding activities for every activity in ascending order by Activity Number. For completed activities, the Actual Start Date shall be used as the secondary sort.

3) Total Float Report: A list of all activities sorted in ascending order of Total Float. Activities which have the same amount of total float shall be listed in ascending order of Early Start Dates.

4) Critical Path Report: A list of all activities on the longest path through the project. Activities shall be listed in ascending order of Early Start Dates.

5) Resource usage curve and report showing trades or equipment required for each day of the project duration, with each resource identified by activity number.

6) Listing of holidays and other non-work days.

7) Listing of all imposed dates (constraints).

5. Cost Loaded CPM Requirements

a. Contractor shall indicate a cost value for each work activity with the sum of those individual activity costs being equal to the total cost of the contract amount.

1) Cost loaded activities such as "startup" or "mobilization" will not be allowed unless Contractor submits supporting documentation of actual costs for these activities. All other overhead and other Contractor costs shall be allocated to the work activities in relationship to the work activities apportioned value.

WSSC Contract No. CD6915B20 01320-5 December 2025

2) Unless otherwise specified, markup and overhead costs will be allowed on installation and work activities only, not on submittal, fabrication and delivery activities.

3) Unless otherwise specified, payment for Contractor submittals will not be allowed. Payments will be made to Contractor only as set forth in General Conditions Article 22.

4) Payment for Insurance and Bond costs will be allowed as set forth in General Conditions Article 22.

a) In addition to indicating the activity costs on the required computer printout reports, Contractor shall provide a cash flow curve by early and late dates.

b) On a monthly basis, the activity cost values will be progressed in accordance with the activity progress, except in the case of fabrication and delivery of material and equipment items. In such cases the activity duration will progress in proportion to its fab/delivery status, and its cost will remain 0% complete until the item is actually delivered and installed as set forth in the General Conditions.

c) The activity cost values and the monthly progress update shall be the basis of payment to the Contractor. The monthly activities percentages shall be approved by the Engineer prior to the Contractor processing the CPM update reports. The schedule update accepted by the Engineer and

Monthly Progress Application for Payment.

6. Additional requirements:

a. The Schedule Baseline file must contain activity codes categorizing all project activities. For example these activity codes could be and are not limited to:

1) Phases/Locations

2) Responsibility (Community, Contractor, Engineer, etc.)

3) Type of work (Administrative, Civil, Electrical, etc.)

plan

b. For Baseline schedule, Activities within each category shall be sorted by logic order and float file

c. For the Update schedule(s), activity table must show actual dates and progress percentage.

7. Review of system:

a.

network…