WASHINGTON SUBURBAN SANITARY COMMISSION

GENERAL CONDITIONS AND STANDARD SPECIFICATIONS

TABLE OF CONTENTS

TOC-1 2026

DIVISION SECTION TITLE DATE RELEASED

PAGES

GC GENERAL CONDITIONS 2020 26

1 GENERAL REQUIREMENTS

01110 Summary of Work 2026 15 01150 Site Conditions 2026 3 01330 Submittal Procedures 2026 14 01450 Quality Control 2026 3 01500 Temporary Facilities and Controls 2026 11 01570 Temporary Erosion and Sediment Control 2026 12 01630 Substitution Procedures 2026 2 01770 Project Cleanup 2026 3

2 SITEWORK

02070 Geosynthetics 2026 9 02230 Site Clearing 2026 4 02315 Earthwork for Pipeline Construction 2026 26 02370 Slope and Watercourse Protection 2026 8 02441 Microtunneling 2026 11 02445 Boring and Jacking 2026 8 02446 Horizontal Directional Drilling 2026 6 02510 Water Distribution System 2026 77

02510 Water Distribution System - Contractor Furnishes All Materials

02511 Chlorination and Dechlorination 2026 9 02512 Cleaning and Lining Water Mains 2026 8 02530 Sanitary Sewage System 2026 40 02533 Pressure Sewer System 2026 18 02820 Fences and Gates 2026 7 02920 Lawns and Grasses 2026 9 02930 Exterior Plants 2026 8 02950 Pavement Requirements 2026 8 02955 Sewer Main & Lateral Rehabilitation By Lining 2026 22

02956 Closed Circuit Television Inspection of Sewer

Mains, Manholes & Laterals

02957 Sewer Manhole Rehabilitation 2026 20

TOC-2 2026

DIVISION SECTION TITLE DATE RELEASED

PAGES

02958 Pipe Bursting System

02959 Sewer Main and Lateral Connection Sealing by

Chemical Grout

02960 Temporary Bypass Pumping Systems 2026 5

3 CONCRETE

03300 Cast-in-place Concrete 2026 11 03400 Precast Concrete Undergrounds Structures 2026 27

4 MANSORY

04200 Masonry 2026 4

5 METALS

05500 Metal Fabrications 2026 8

13 SPECIAL CONSTRUCTION

013110 Galvanic Anode Cathodic Protection 2026 23

013112 Impressed Current Cathodic Protection for Water and Sewer Pipelines 2026 24

01110-1 2026

STANDARD SPECIFICATIONS

SECTION 01110

SUMMARY OF WORK

PART 1 GENERAL

1.1 DESCRIPTION

(For Area Service Connection Contracts (AC and LC) only) A. Section includes general requirements for Work.

1. Engineer will issue work order, which may consist of one of the following conditions, for each connection as each request is received by the Commission or as directed by Engineer.

a. Installation of one water service connection, one sewer service connection, or one water and sewer service connection, serving the same address.

b. Locate missing existing water and/or sewer service connection, if short of property line or unable to locate, extend or install.

c. Correct defective existing service connection.

d. Abandon water or sewer service connection only.

2. Perform Work for site locations with other available data furnished by and under Engineer’s direction.

(For all other Contracts) A. Section includes general requirements for Work.

1.2 COMMISSION WORK SCHEDULE

A. The Commission observes 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) Juneteenth Day.

6) Independence Day.

7) Labor Day.

8) Columbus Day/Indigenous Peoples’ Day.

9) Veterans Day.

10) Thanksgiving Day and the following Friday.

11) Christmas Day.

12) State and National Election Days.

13) Inauguration Day.

01110-2 2026

C. Permission to Work.

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

2. At the request of the Engineer, provide evidence that materials necessary to Perform the work are either on-site or are firmly committed for delivery prior to the need of those materials.

3. 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 Engineer 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) After 24 hours written notification to Engineer, tunneling work may be performed up to 24 hours per day continuous operation, subject to jurisdictional restrictions and Special Commitments contained in Contract Documents.

c) Request written permission of Engineer 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.

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

5. Pay overtime at WSSC current published hourly rate for services of WSSC Inspector beyond hours listed in Contract Documents, except where delays are approved by Engineer.

6. (For work in a Township Only) Work performed within the limits of ______:

Between hours of ______a.m. and ______p.m.

1.3 SPECIFICATION STYLE

A. These specifications are written in imperative mood and streamlined form.

B. This imperative language is directed to the Contractor, unless specifically noted otherwise.

C. The words "shall be" are included by inference where a colon (:) is used within sentences or phrases.

1.4 REFERENCE DOCUMENTS

A. Applicable Codes, Specifications and Standards.

01110-3 2026

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.

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 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 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

01110-4 2026

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 PCA Portland Cement Association SCS Soil Conservation Service SDR Standard Dimensional Ratio SSPC Steel Structure Painting Council

01110-5 2026

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

1.6 COMMISSION RESPONSIBILITIES

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

1) The Commission will:

a) Secure land and right-of-way necessary for carrying out and completing Contract Work.

b) Obtain 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 Engineer and shall be available at the construction site.

2) Specific requirements contained in the permits and right of way agreements not covered elsewhere in the Specifications or on the Drawings but are the responsibility of the Contractor will be included in the Special Provisions.

3) Measurement and Payment.

a) Work attributed to compliance of land agreement/permits as described by items listed in Bid Schedule.

b) Other costs attributable to land agreement/permit compliance:

Incidental to Contract.

B. The Commission will perform work set forth elsewhere in Contract Documents.

C. The Commission will furnish one 3/4-inch water meter for each Contract to meter water used during construction.

1) No charges will be assessed to Contractor for water used on the Contract.

D. The Commission will establish an e-builder account to be used and assign Contractor’s representatives.

1.7 CONTRACTOR RESPONSIBILITIES

A. Contractor Supplied Material.

1) Contractor shall supply all pipe and fittings necessary for construction.

2) Requirements and instructions for approval of Contractor supplied materials are specified under Section 01330, Submittal Procedures.

3) Requirements and instructions relating to the responsibility for quality control involving supplied material are specified under Section 01450, Quality Control.

01110-6 2026

4) Requirements and instructions relating to the responsibility to furnish piping for water supply and distribution system are specified under Section 02510, Water Distribution System.

5) Requirements and instructions relating to the responsibility to furnish piping for sanitary sewage system are specified under Section 02530, Sanitary Sewage System.

B. Commission Supplied Materials.

1) Material Issue Procedures:

a) Arrange for pickup of pipe via email at

ContractorMaterialOrders@wsscwater.com

1) For pickup of materials (including pipe, and fittings 14 inches and smaller) provide at least 3 working days before pickup.

2) For pickup of materials (including pipe, and fittings 16 inches and larger), arrange for material pick up at least 90 working days before pickup.

b) Arrange for delivery of pipe via email at PipeOrderDelivery@wsscwater.com. WSSC Engineer must be copied on email request.

1) For delivery of 14 inch and smaller diameter zinc coated pipe, provide at least 3 working days’ notice prior to requested delivery date. Include with email request, the contract number, contractor’s name, delivery date requested and specific site location to include city, state, zip code, job site contact and phone number.

2) For delivery of 16-inch diameter and larger pipe, provide at least 90 working days’ notice prior to requested delivery date. Include with email request; contract number, contractor’s name, delivery date requested and specific site location to include city, state, zip code, job site contact and phone number.

c) Costs incurred by the Commission for restocking materials when pick up is not made at scheduled time will be paid by the Contractor at the WSSC current published rate and deducted from the most recent estimate.

d) The Contractor shall reimburse the Commission for any costs associated with the Contractor’s rescheduling of confirmed pipe materials and/or material transportation arrangements with the distributor/supplier/carrier. The costs will be invoiced to the contractor or may be deducted from the Contractor’s pay estimate. The cost shall be for the actual direct cost billed to the Commission without any additional mark-up.

e) Materials pick up appointments will be scheduled between 9:00 a.m. and 2:00 p.m.

1) Material will not be issued between noon and 1:00 p.m. or on Friday afternoons, except for emergencies as approved by the Engineer.

mailto:ContractorMaterialOrders@wsscwater.com mailto:PipeOrderDelivery@wsscwater.com

01110-7 2026

f) Provide copy of materials list. Show on list desired quantities, clearly handwritten and highlighted in yellow, for each type of material that will be picked up.

g) Provide adequately sized trucks and minimum of 2 individuals, for materials release.

h) Obtain 2 copies of Contract Material Return Form with materials for return of excess materials.

i) Load material at the yard.

j) Commission will furnish equipment with operator to load heavy material.

k) Observe safety requirements maintained at the Commission's

Anacostia Warehouse. Wear appropriate safety wear, hard hat, safety shoes and long pants.

l) Transport, unload, and store material on Contract site to Engineer’s satisfaction.

m) Replace material damaged or lost between issue and installation at no expense to the Commission.

n) Cost of Commission-issued material not used in the Work and not returned will be withheld from final payment.

2. Water Meters for metering water usage.

a. Water used during construction is to be metered with Commission issued water meter except on temporary bypass water service system.

b. Arrange for meter pickup at one of the following Commission depots;

4102 Lloyd Street, Hyattsville 8444 Temple Hills Road, Temple Hills 2501 Lyttonsville Rd, Silver Spring 111 West Diamond Avenue, Gaithersburg

c. Provide valid driver’s license and copy of Notice to Proceed letter at time of meter pickup.

d. Use meter only on contract to which it is assigned.

e. Return meter every 6 months for calibration.

f. Return meter to depot within 60 days of issuance of Certificate of Substantial

Completion.

g. Cost for lost or damaged water meters: Responsibility of Contractor.

3. Excess Material Return Procedure.

a. Return excess materials clean and undamaged, with all accessories.

b. To return excess material after Contract Work is completed, make arrangements for return, and provide trucks and personnel in same manner as for obtaining Commission-supplied material.

c. Present 2 copies of Contract Material Return Form, completed in black ink or typed, and signed by Engineer, to Commission's Anacostia Warehouse when returning material.

1) One copy will be returned to Contractor after material is accepted.

4. Scrap Material Return Procedure.

01110-8 2026

a. Return to store yard at Anacostia warehouse all unusable items of metallic compositions such as pipe, valves and other castings, bronze meters, copper tubing, etc., including cut portions of new pipe and existing pipe and appurtenances unearthed and removed from system during construction.

1) If large quantities are being returned, schedule appointment with the warehouse.

b. Engineer shall determine whether items are classified as scrap or refuse following WSSC Regulation REG-PRM-LO-2014-001 approved 11/14/13.

1) Contact Materials Management Division Manager with questions or clarification.

C. Use of Premises and Offsite Work.

1. Lands by Contractor.

a. Obtain permits and written approvals from appropriate jurisdictional agency and property owner for use of premises not furnished by the Commission as described herein and offsite areas, including offsite borrow pits and waste areas.

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

c. Furnish copies of permits and approvals to Engineer before using areas.

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

e. 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).

a. Do not enter upon unless concurrent WSSC water and sewer easement and Work are shown on Drawings.

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

E. 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 firefighting 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.

01110-9 2026

4. See Traffic Control Plan, Section 01500.

F. Explosives:

1. Perform blasting using specialized blasters and store explosives following OSHA, Title 29, CFR 1926.901 "Blaster Qualifications."

a. Do not store explosives on site during non-working hours.

b. During work hours, store explosives following specifications herein and jurisdictional requirements.

2. No blasting permitted within MSHA rights-of-way without prior approval of type and method by MSHA with appropriate County or Local Jurisdiction permits submitted to Engineer.

a. MSHA reserves right to require insurance policy and Letter of Indemnity.

G. 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.

H. 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;

1) Name and number of the contract.

2) Name of Contractor.

3) Name of photographer.

4) Include for each photograph;

a) File name

b) Date taken

c) Location of the view

I. Pre-Construction Video.

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

01110-10 2026

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.

J. 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.

K. Towing of Vehicles

1. Tow parked vehicles that are obstructing the work area if adequate notice has been provided, at no cost to the Commission. See Section 01500.

L. Sequence of Construction

1. Incorporate Sequence of Construction into the overall project schedule for work affecting more than 1 mile of water main.

a. Requirements for Sequence of Construction are as follows and as noted on contract documents:

1) Install any new valves for water shutdowns

2) Phase 1: Start of project and includes the first mile (approximately) of water main to be laid.

3) Phase 2: Second mile (approximately) segment of water main to be laid and cannot start unless the following requirements are met:

a) 100% of Phase 1 water main completed and in-service.

b) Approximately 50% of Phase 1, water house connections completed and in-service.

c) Approximately 40% of Phase 1, permanent patch completed.

4) Phase 3: Third mile segment (approximately) of water main to be laid and cannot start unless the following requirements are met:

a) 100% of Phase 1 is completed and permanent patch in phase one is completed

b) 100% of Phase 2 water main completed and in-service.

c) Approximately 50% of Phase 2, water house connections completed and in-service.

d) Approximately 40% of Phase 2, permanent patch completed.

5) All remaining Phases same as Phase 3 above.

2. Within 15 days of the Notice to Proceed, submit a construction schedule in accordance with 01330 incorporating the Sequence of Construction noted in the Contract Documents or as regulated by permit. Include a narrative for any deviation from the Sequence of Construction.

01110-11 2026

3. 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. The Contractor shall make every effort to complete house connections and laterals in a timely manner. 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 all 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 all 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.

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 Engineer with actual utility locations and elevations, or as otherwise directed by Engineer.

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 Engineer.

4. Submit grade sheets, with identifying sketch, showing for each station the marked point elevation, invert elevation required and corresponding cut for both

01110-12 2026 centerline and appropriate offset. A Registered Professional Land Surveyor (RLS) or a Property Line Surveyor (PLS) shall be the responsible party for all grade sheets throughout the entire construction period. All cut (grade notes) sheets, field notes, and sketches will be signed and sealed by an RLS or a PLS unless and RLS or PLS identified by the Contractor in writing and approved by the Engineer in advance of the work. The written request shall be on company letter head and include a copy of the stamp of the assigned RLS or PLS. When approved in advance, cut sheet must reference the license number of the responsible RLS or PLS, but original signatures are not required.

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

b. Use Contractor's Construction Stake Out Record form. See Standard 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 batterboards, forms, string lines, and finished grade control, slope stakes and other controls which may be required for proper construction of Work.

E. For other types of construction:

1. Stakeout following requirements herein and Engineer’s direction.

2. Wetlands and Wetland Buffers:

a. Cross-sections of work limits every 50 feet before and after construction and before final stabilization to certify restoration to their original grades and elevations.

F. Construction shall not begin until Engineer 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 Engineer 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. (Area Service Connection Contracts (AC and LC) only) Quantities appearing in

Bid Schedule are not guaranteed amounts but do represent the best estimate of the Commission, based on previous usage and projected needs. Payment to Contractor will be made only for actual quantities of work performed or materials furnished following Contract. 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. Adjustment shall be based upon any increase

01110-13 2026 or decrease in unit costs due solely to variation above 125 percent or below 75 percent of estimated quantity. This adjustment shall only be applied to the quantity above 125 percent or below 75 percent of estimated quantity. 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 judgment the findings justify.

A. (All other Contracts) 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.

1.11 LUMP SUM CONTRACTS

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

1.12 CONTINGENT ITEMS

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

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

C. 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.

01110-14 2026

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

C. 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.

D. 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.

1.16 MOBILIZATION

A. (Area Service Connection Contracts (AC and LC) only) Measurement: By each.

B. Payment: At fixed contingent unit price listed in Bid Schedule.

1. Payment will be made when;

a. Existing service connection is found and no other work is required.

b. Site has water or sewer service connection and total of water and sewer service connection on a site is less than 15 feet.

c. Abandonment of sewer service is performed not in conjunction with any other work.

d. Directed by Engineer to mobilize from site actively working to another site.

e. Installing cleanout only and no other work is required.

f. Installing backwater valve only and no other work is required.

01110-15 2026

g. Installing outside meter setting only and no other work is required.

h. Abandonment of a water service connection only is performed and no other work is required.

Or, A. (All other Contracts) Measurement: By Lump Sum.

B. Payment: At fixed lump sum unit price as listed in Bid Schedule made in monthly payments, less retention, based on Contractor's approved progress schedule submitted (see Section 01330) and includes:

1. Cost of bonds and insurance.

2. Clearing and preparing work areas.

3. Providing sediment control devices.

4. Providing construction access roads.

5. Mobilization of construction equipment, assembly and delivery of plant, materials and supplies necessary for the prosecution of work but not intended to be incorporated into the work.

PART 2 PRODUCTS

NOT USED

PART 3 EXECUTION

PART 4 MEASUREMENT AND PAYMENT

4.1 Except as otherwise specified herein, providing for and complying with requirements in this

Section will not be measured for payment, but cost will be considered incidental to Contract.

**WSSC**

01150-1 2026

SECTION 01150

SITE CONDITIONS

GENERAL

DESCRIPTION

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

EXISTING UTILITIES

General.

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

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

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.

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.

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.

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.

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

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.

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

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.

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

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

01150-2 2026

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.

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

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.

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

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.

Maintain and protect utility structures and appurtenances at all times.

OTHER EXISTING IMPROVEMENTS, STRUCTURES, AND FACILITIES

Locate, protect and maintain, or remove and restore, existing improvements, structures, and facilities within and adjacent to Construction area whether or not shown on drawings, unless Engineer directs otherwise.

Trees and Shrubberies: Protect from damage.

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

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.

Fences, Curbs, Gutters, Walkways, Driveways, Driveway Aprons and Flagstone: Remove and replace in original position or at Engineer's direction.

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

PRODUCTS

EXECUTION

MEASUREMENT AND PAYMENT

01150-3 2026

Except as otherwise noted herein, providing for and complying with requirements in this Section will not be measured for payment, but cost will be considered incidental to Contract.

01330-1 2026

SECTION 01330

SUBMITTAL PROCEDURES

A. Section includes general requirements and procedures related to preparation and transmittal of Submittals to include Schedules, Contractor's Drawings, Samples, Manuals, Methods of Construction, and Record Drawings to Engineer demonstrating performance of Work.

1. Other requirements for submittals are specified under applicable sections of Standard Specifications and Special Provisions.

1.2 SUBMITTAL REQUIREMENTS

A. General.

1. Submit each under separate cover or transmittal.

2. Furnish neat, legible, and sufficiently explicit detail to enable proper review for Contract compliance. Illegible submittals shall be considered incomplete or defective and will be returned.

3. Show complete and detailed fabrication; assembly and installation details;

wiring and control diagrams; catalog data; pamphlets; descriptive literature; and performance and test data.

4. Include calculations or other information sufficient to show comprehensive description of structure, machine, or system provided and its intended manner of use.

a. With each submission, furnish Engineer specific written notation and justification of each variation in Contractor's Submittals from requirements of Contract Documents.

b. Fabrication, purchase or delivery of materials to the site, and installation of materials or Work performed before approval, or not conforming to approved submittals, shall be at Contractor's risk.

5. Engineer’s review and approval of submittals shall not relieve Contractor from responsibility for fulfillment of terms of Contract, unless Engineer has received specific written notice of each variation and has given specific written approval.

6. Contractor assumes all risks of error and omission.

7. Contract Work, Materials, Fabrication, and Installation: Following approved submittals.

8. Submittals shall be made electronically through the Commission’s online construction management tool, currently E-Builder. Hard copies shall be provided only as noted herein. When a hard copy is submitted, a transmittal of those items shall be made through E-Builder noting how the hard copy or sample was submitted to the Engineer.

01330-2 2026

B. Process and Requirements.

1. Not later than 3 days after preconstruction conference, submit written list of materials and equipment to be purchased, giving name, address, and telephone number of Supplier, Manufacturer, or processor.

a. Submit updated material and equipment list when changes are made.

2. Coordinate and schedule submittals with construction schedule and

Engineer.

3. With the first submittal, but not later than 30 days after Notice to Proceed, submit a complete submittal schedule, listing as near as practicable and by Specification Section number, submittals required and approximate date submittal will be forwarded.

a. Arrange submittals schedule so that related equipment items are submitted concurrently.

b. Engineer may require changes to submittal schedule to permit concurrent review of related equipment.

4. To each submittal affix the following signed Certification Statement.

a. "Certification Statement: By this submittal, we hereby represent that we have determined and verified all field measurements, field construction criteria, materials, dimensions, catalog numbers and pertinent data and we have checked and coordinated each item with other applicable approved drawings and all Contract requirements.”

5. Identification.

a. Submit identification data, as applicable, contained thereon or permanently adhered thereto:

1) The Commission Contract Number.

2) Project name and location.

3) Submittal Numbers:

a) Number sequentially as submitted.

b) Resubmittals shall bear original submittal number and be sequentially lettered.

4) Product identification.

5) Drawing title, drawing number, revision number, and date of drawing and revision.

6) Applicable Contract Drawing Numbers and Specification

Section and Paragraph Numbers.

7) Subcontractor's, Vendor's and/or Manufacturer's name, address and phone number.

8) Contractor's Certification Statement.

b. Identify on exterior, catalog product data or brochures submitted in packages of multiple items. Include page and catalog item numbers for items submitted.

1) Highlight catalog, product data, or brochures containing various products, sizes, and materials to show particular item submitted.

2) Mark items not applicable to Contract "not applicable" or cross out.

3) If one or more items in catalog submittal are not approved, resubmit only unapproved items.

01330-3 2026

6. Number of Copies: See requirements in Submittals specified herein.

7. Approval Process.

a. Follow submittal schedule provided to Engineer. Engineer will return submittal within 30 days.

b. Submittals will be returned, marked with one of following classifications:

1) APPROVED: Requires no corrections, no marks.

2) APPROVED AS NOTED: Requires minor corrections. Items may be fabricated as marked without further resubmission.

Resubmit 2 corrected copies to the Engineer.

3) REVISE AND RESUBMIT: Requires corrections. No items may be fabricated. Resubmit entire submittal following original submission with corrections noted. Allow 30 days for checking and Engineer’s appropriate action.

4) REJECTED: Requires major corrections or is otherwise not following Contract Documents. No items shall be fabricated.

Resubmit entire submittal following original submission with corrections noted. Allow 30 days for checking and Engineer’s appropriate action.

5) INFORMATION ONLY: Items specified by Contract Documents.

C. Electronic Submittals: PDF Format, as approved by Engineer.

1.3 SUBMITTALS

A. Schedules. (Excluding Area service connection contracts AC, LC)

1. Material Supply Availability

a. Within 10 days of the Notice to Proceed, submit a list of all critical materials to be supplied on the Contract. Include the name of the supplier, the quantity of material, the lead time for the materials, and the expected delivery date for the materials. Should the material availability impact the ability to begin work, provide a written request to delay the start of on-site activities to accommodate material deliveries. Reflect material availability and delivery in the project schedule.

2. Schedule of Breakdown for Each or Lump Sum Items:

a. Before first application for payment, submit to Engineer schedule of breakdown for lump sum items, aggregating total amount bid for each. Include with each breakdown its proper share of overhead, profit, and applied General Conditions. Subdivide Work into activities on Construction Schedule in sufficient detail. Coordinate with breakdowns submitted herein, to serve as basis for progress payments during construction.

b. Prepare schedule of breakdown in form acceptable to Engineer and furnish with data to substantiate its correctness as Engineer may require.

3. Construction Schedule - Critical Path Method.

a. Within 15 days after construction start date in Notice to Proceed, prepare and submit a preliminary schedule in time-scale format, indicating planned operations during first 60 days. Include cost of activities expected to be completed or partially completed before submission and mutual acceptance of entire schedule. Acceptable schedule formats include the latest version of

01330-4 2026

Primavera P6 and MS Project.

b. Submit original schedules and updates in the original program native format, including all calendars and resource files. In addition to the native format, submit a PDF version of the schedule formatted as a Gantt chart and scaled to fit on 11x17 sheets. If the time scale extends to multiple sheets, include the columns identifying the activities on each sheet.

c. When the base schedule has been approved, submit a full copy of the schedule with an accepted baseline.

d. Within 45 days after construction start date in Notice to Proceed, submit 5 copies of a complete network analysis system, showing usage of entire Contract Time, consisting of detailed network, mathematical analysis, and network diagram. Present schedule in the form of an Arrow Diagramming Method (ADM) CPM Network Diagram.

1) Show order and interdependence of activities and sequence in which Work will be accomplished. Show how the start of a given activity is dependent on completion of preceding activities and how its completion restricts start of following activities.

2) Show following detailed network activities on network diagram, in addition to construction activities;

a) Submittal and approval of samples and submittals.

b) Procurement of critical materials and equipment.

c) Identify when critical materials (pipe, fittings, valves) are to be on site and available for the next phase of work.

d) When supply chain is critical to ongoing water and sewer main work, divide work into appropriate phases. Demonstrate that materials will be on site for each phase of the work.

e) When work includes water main bypass, include a task for installation and removal of all bypass. Schedule shall reflect the requirement to remove bypass by November 15.

f) When work includes sewer bypass, indicate the set-up and removal of the bypass system.

g) Fabrication of materials and equipment, their installation and testing.

h) Specified intermediate milestone or completion dates.

i) Show duration of each activity in working days, with minimum of 1 working day and maximum of 30 Calendar days for any on site activity. Material and equipment related delivery activities are exempt from the maximum duration requirement.

j) For projects affecting greater than approximately 1 mile of water main, the construction schedule shall reflect Sequence of Construction requirements provided in Section 01110 and as modified elsewhere in contract documents. Deviations from these requirements shall be noted in the schedule narrative and are subject to approval by the ENGINEER. Work on subsequent phases shall not begin until all main in the previous phase is complete and at least 50% of the connections are complete.

3) Group related activities on network and highlight activities on critical path. Time-scale network using units of approximately 1/2-inch equals 1 week or other suitable scale approved by Engineer. Indicate weekends

01330-5 2026 and holidays. Where slack exists, show activities at earliest time they are scheduled to be accomplished. Use sheet size 22 inch by 34 inch minimum, or per Engineer’s approval. Place title and revision block in lower right-hand corner. Give dummies duration of zero.

4) Include tabulation of each activity shown on detailed network diagram in the mathematical analysis. Furnish following information as minimum for each activity:

a) Activity node numbers (I/J).

b) Activity description.

c) Duration of activity in units of working days.

d) Earliest start date (by calendar date).

e) Earliest finish date (by calendar date).

f) Scheduled or actual start date (by calendar date).

g) Scheduled or actual finish date (by calendar date).

h) Latest start date (by calendar date).

i) Latest finish date (by calendar date).

j) Slack or Float (working days).

k) Activity percent complete and remaining duration.

l) Monetary value of activity.

m) Responsibility code for each activity (Prime Contractor, subcontractors, suppliers, the Commission).

n) Manpower required by trade and by total.

o) Equipment required.

5) List activities in sorts or groups in mathematical analysis:

a) Ascending activity node number (I/J).

b) Amount of total float, then in order of activity number.

c) Latest start date, then in order of activity number.

d) Responsibility in order of earliest start date.

6) To facilitate review of payment requests, submit separate sort consisting of activities to which monetary values are assigned. Organize by node number from lowest to highest and then in order of following node number. As minimum for each monetary activity furnish:

a) Activity node numbers (I/J).

b) Activity description.

c) Monetary value of activity.

d) Previous amount.

e) Current amount.

7) Furnish initial submittal and revisions in 3 copies.

e. Review of system:

1) Participate in Engineer’s review and evaluation of proposed network diagrams and analysis. Resubmit revisions necessary as a result of this review to Engineer within 10 days after conference. Allow 20 days for Engineer’s checking and further action.

2) Progress payments will be withheld pending attainment of mutually acceptable schedule. Engineer’s review and mutual acceptance of Contractor’s schedule is for conformance to requirements of the Contract Document. Review and mutual acceptance by Engineer of Contractor’s schedule does not relieve Contractor of any of its Contract Document

01330-6 2026 responsibilities for accuracy or feasibility of schedule, or of Contractor’s ability to meet interim project milestone dates and Contract completion date, nor does such review and mutual acceptance expressly or impliedly warrant, acknowledge or admit the reasonableness of the logic, durations, manpower, or equipment loading of Contractor’s schedule.

3) Contractor shall use mutually accepted schedule for planning, organizing, directing, and executing Work and for reporting progress.

4) To make subsequent changes to method of operating and scheduling, submit written request separately to Engineer for review, stating reasons for change(s). For major changes, Engineer may require Contractor to revise and submit, without additional cost to the Commission, all affected portions of network diagram and mathematical analysis to show effect on entire project.