Technical Specifications.pdf

TECHNICAL SPECIFICATIONS

MONTROSS WATERLINE IMPROVEMENT

EXTENSTION PART 2

TOWN OF MONTROSS, VIRGINIA

March 2026

P.N. 23011622.00

9560 Kings Charter Drive

Ashland, VA 23005

TABLE OF CONTENTS

SECTION TITLE

01010 SUMMARY OF WORK

01020 EROSION AND SEDIMENT CONTROL PLAN

01300 SUBMITTALS

02221 HORIZONTAL DIRECTIONAL DRILL

02225 TRENCHING & BACKFILLING

02310 JACK AND BORE

02665 WATER DISTRIBUTION SYSTEM

02935 SEEDING

03300 CAST IN PLACE CONCRETE

13704 TRAINING

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SECTION 01010

SUMMARY OF WORK

PART 1 - GENERAL

1.1 BASIC CONTRACT

A. General

1. The intent and meaning of the Contract Documents require that the

Contractor, under the terms of his contract, shall take such action as necessary and required to provide labor, plant, materials, equipment, transportation, facilities, and appurtenances thereto, which are indicated or reasonably implied by each Drawing and each section of the Specifications, all of which are collectively necessary and required for the execution of the Work.

B. Description of Work at Property as shown on the plans:

The Contractor shall furnish all materials, labor, and supervision to perform services described in Contract Documents to complete the following work:

Item no.

Item Description Quantity Unit

1 Mobilization/Demobilization 1 LS

2 Jack and Bore 3 LS

3 6” C-900 PVC Pipe and Fitting 4650 LF

4 6” Gate Valves and Box 10 EA

5 2” Blow off Valve Assembly 1 EA

6 Service Connection including corporation stops and meter box connection

60 EA

7 Fire Hydrant Assembly 5 EA

8 Connection to existing System 3 EA

9 Flushing, Testing and Bacterial Testing 1 LS

1.2 PERMITS AND REGULATIONS

A. The Contractor's responsibility includes compliance with federal, state, and local regulations which in any way affect the work or implementation of the project.

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B. All work shall be done in accordance with VDH & VDEQ regulations for a potable water supply.

1.3 EXISTING CONDITIONS

A. All information relating to existing subsurface structures and pipes is from the best sources at present available to the Developer. All such information and the drawings of existing construction are furnished only for the information and convenience of Bidders.

B. The Bidder is responsible for ascertaining the character, quantities, and conditions of the various materials and the work to be done.

1.4 PROJECT CONSTRUCTION REQUIREMENTS

A. All materials and equipment held in storage by the Contractor shall be protected from the weather, vandalism, and/or flooding by suitable waterproof coverings, or by placing in storage buildings until ready for installation or until equipment is to be turned over to the Developer.

Equipment that is damaged or becomes inoperable shall be rejected and must be restored or replaced at no additional cost to the Developer.

1. The Contractor shall effectively protect, at his own expense, his work, materials, and equipment for the duration of the construction period.

2. The Contractor shall exercise care in the installation of all equipment to avoid damage of any kind. All equipment shall be protected from dust and moisture prior to and after installation.

B. The Contractor shall make appropriate arrangements with the utility companies to provide for services necessary to complete the work. The Contractor shall comply with all protection requirements for the existing utilities.

1. Prior to construction, the Contractor shall determine in the field the exact location and depth of all affected existing utility lines.

1.5 MISCELLANEOUS ITEMS

A. The Contractor shall ensure that his work covered under this Contract complies with all required erosion and sedimentation control regulations.

B. The Contractor shall inform his subcontractors of the conditions listed in this SUMMARY OF WORK, since the Contractor shall be held responsible

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for the work of his subcontractors.

C. Coordinate use of premises with Developer.

D. Assume full responsibility for the protection and safekeeping of product under this Contract, stored on site.

E. Obtain and pay for the use of additional storage or work areas needed for operations.

1.6 SPECIAL PRECAUTIONS

A. General

1. The Contractor shall protect all pavement, structures, and trees outside of construction limits.

2. The Contractor shall, when working in areas where overhead wires are encountered, take special precautions. If necessary, wires shall be removed, and temporary services placed. The cost of this work shall be included in the Bid price.

B. Existing Utilities

1. The Contractor shall make appropriate arrangements with the utility companies, 10 days before he starts construction, to provide for services necessary to complete the work. The Contractor shall comply with all protection requirements for the existing utilities.

a. Prior to construction, the Contractor shall determine in the field the exact location and depth of all affected existing utility lines.

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b. In order to determine if a deviation in horizontal or vertical location of the pipes may be required, the Contractor shall plot the actual location and depths of utilities on the Contractor's record drawings. The Contractor shall report to the Engineer, a minimum of five days before the start of construction if interference is apparent.

* * * * * END OF SECTION * * * * *

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January 2025

SECTION 01020

EROSION AND SEDIMENT CONTROL PLAN

PART 1 - GENERAL

1.1 INTENT

A. The Soil and Water Conservation Commission (SWCC) of the

Commonwealth of Virginia requires the preparation and implementation of a plan for the prevention of accelerated soil erosion and sediment of the streams of the Commonwealth under Title 21, Chapter 1, Article 6.1 of their regulations. Such plans are required for all earth-moving activities, and it is intended that this plan will fulfill this SWCC requirement and prevent sediment.

B. It shall be the responsibility of the Contractor to implement this plan in the field and to meet all state and local regulations. The Contractor shall assign this responsibility to a person experienced in sediment and erosion control procedures. Modifications or deviations from this plan will be allowed only if the Contractor first obtains written permission from the Division of Soil and Water Conservation.

1.2 APPLICABLE STANDARDS

A. Virginia Erosion and Sediment Control Regulations Minimum Standards, 4VAC-30-40 paragraph 16.

B. Virginia Erosion and Sediment Control Handbook, latest edition, Virginia

Department of Conservation and Recreation, Division of Soil and Water Conservation.

1. Std. & Spec. 3.02, Stone Construction Entrance

2. Std. & Spec. 3.05, Silt Fence

3. Std. & Spec. 3.19, Rip Rap

4. Std. & Spec. 3.30, Topsoiling

5. Std. & Spec. 3.31, Temporary Seeding

6. Std. & Spec. 3.32, Permanent Seeding

7. Std. & Spec. 3.35, Mulch

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1.3 RELATED WORK SPECIFIED ELSEWHERE

A. Seeding - Section 02935- SEEDING

B. Excavation and Backfilling - Section 02225 - EXCAVATION AND

BACKFILL

1.4 MEASUREMENT AND PAYMENT

No separate item is provided for erosion and sediment controls; the cost must be included in the unit prices for the items to which the erosion controls pertain or be included in the lump sum price of the Contract wherever applicable.

PART 2 - PRODUCTS

2.1 GENERAL

All products and materials shall meet the requirements of the Virginia Erosion and Sediment Control Handbook or as specified elsewhere in these Specifications.

PART 3 - EXECUTION

3.1 PLANNING AND DESIGN FOR CONSTRUCTION

A. Construction of projects that involve major land disturbance such as this project shall be planned and designed with soil erosion and sediment control in mind. While erosion and sediment controls are important on all sites, particular attention should be given to areas of steep topography and highly erodible soils. Cleared areas shall be kept to a minimum and for the shortest practical distance ahead of construction.

B. Where practical, a schedule of earth-moving activities shall be included in the above.

C. Restoration work shall be done as the project progresses and not be left until the end of the project. No areas shall be left unprotected for more than 20 days without some form of temporary seeding or, if in a non-growing season, some other form of stabilization such as mulch.

3.2 STOCKPILES & DISPOSAL OF DRILLING MUD

A. Stockpile areas and mud drilling materials shall also be selected with the

County and maintained by The Contractor’s on-site personnel. Site selections and stockpile/mud disposal design shall incorporate erosion and sediment control facilities to prevent production and delivery of

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sediment to waterways, damage to vegetation, and the unnecessary destruction of trees that are selected for preservation. Temporary or interim stabilization of soil stockpiles shall be promptly instituted.

Stockpiles shall not be placed on critical slopes. Stockpiling in or immediately adjacent to diversion channels will not be allowed.

Containment structures shall be installed on large stockpiles. Their design and implementation shall be accomplished by competent on-site personnel.

B. Temporary vegetative measures planned for implementation on stockpile areas shall be established immediately after the stockpile operation is completed or within 20 days. Proper mulching and soil stabilization in conjunction with seeding operations shall also be carried out.

3.3 PUMPED WATER

Pumped water management shall be practiced by the Contractor to reduce the production of sediment. Pumped water shall be discharged through portable sediment tanks or onto well-stabilized surfaces with a minimum 75 feet of filter length to be filtered by existing vegetation. If ditches are required to remove pumped water from construction excavations, they shall be given the same consideration as any other man-made waterway and they shall be stabilized so they do not degrade and produce sediment.

3.4 EXCAVATION AND BACKFILL

Excavation shall be closely controlled. The material removed from the excavation shall be selectively stockpiled in areas where a minimum of sediment will be generated and where other damage will not result from the piled earth.

Drainage-ways shall be protected at all times and the piling of soil in drainage-ways will not be allowed. Backfilling operations shall be performed in such a manner that remaining trees are not damaged.

3.5 EROSION AND SEDIMENT CONTROL DETAILS

Erosion and sediment controls, including silt fencing, culvert inlet protection, utility stream crossings, temporary vehicular stream crossings, portable sediment tanks, and stone construction entrances shall be as indicated on the Drawings.

Sediment from portable sediment tanks shall be disposed of properly.

3.6 FINAL GRADING AND SEEDING

A. Finish grading, topsoiling, seeding and/or sodding shall be performed as specified on the Drawings and in Section 02935 -SEEDING, of these Specifications. Types and quantities of soil conditioners, fertilizers, and

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seed mixtures shall be as specified in accordance with the recommendations of the local state agricultural agent.

B. After the construction phase is complete permanent vegetation on the areas that have been disturbed shall be reestablished as rapidly as possible. If the completion of the construction activities does not coincide with a season in which permanent vegetation can be started an interim or temporary program is required.

This shall include soil stabilization, mulching, or the establishment of filter strips. In any case sediment and erosion controls shall be installed promptly and their maintenance assured.

3.7 MAINTENANCE

A. Sediment and erosion control measures and facilities shall be maintained so that they will individually and collectively perform the functions for which they were designed. Inspection shall be made at frequent intervals to detect any impairment in the ability of the erosion control facilities to continue to function effectively. Responsibility for maintenance shall be assigned to an individual who has assess to equipment, material, and funds required to sustain the maintenance schedule.

B. Maintenance shall be performed on control structures after each storm or rainfall event to allow them to continue to perform the function for which they were designed.

C. A fertilization and reseeding program shall be established and carried out as the construction proceeds. Areas where failures have been experienced in the establishment of vegetative protection shall be promptly treated. The reestablishment of permanent vegetative cover shall be initiated as soon as possible in an effort to keep the area requiring maintenance work to a minimum.

D. Information shall be distributed by the Contractor to all persons on the construction site describing and stressing the importance of the proper installation and maintenance of the erosion and sediment control procedures included in this plan.

E. The approved erosion and sediment control plan and any standard conditions relating to Soil Erosion and Sediment Control issues as part of any permits shall always be available at the immediate site of construction activity.

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F. The maintenance of the soil and erosion control facilities shall continue throughout the life of the project.

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SECTION 01300

SUBMITTALS

PART 1 - GENERAL

1.1 SCHEDULES

A. The CONTRACTOR shall be responsible for preparing a Progress or Work Schedule for the entire project.

B. Within 10 days after the formal execution of the Contract, the

CONTRACTOR shall submit to the ENGINEER a Submittal Schedule including the names and addresses of the manufacturers and suppliers of all materials and equipment proposed for the work. Where such names have been directly specified in the BID, or where substitutions have been made in accordance with the Contract Document, repetitive submission will not be necessary.

1.2 SHOP DRAWINGS, SAMPLES AND MANUALS

A. The CONTRACTOR shall process the Shop Drawings required by the Contract to the Engineer and shall be responsible for their timely submission in accordance with the Shop Drawing schedule which is included in the overall progress or work schedule as described in Part 2 of this Section.

B. Any proposed deviations/substitutions from that specified shall be clearly noted on the cover letter transmitting the shop drawing. Failure to so note will be cause for rejection of equipment, materials, etc. after installation.

C. All submissions shall be marked with the Specification Section Number containing the item submitted for review.

D. Revised shop drawings submitted for review shall be marked

"RESUBMISSION."

1.3 CONSTRUCTION PHOTOGRAPHS

A. The CONTRACTOR shall be responsible for all construction progress photographs.

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1.4 SUBMITTAL PROCEDURES

A. Transmit each submittal with transmittal letter.

B. Identify Project, CONTRACTOR, Subcontractor or supplier; pertinent drawing and detail number, and specification section number, as appropriate.

C. Apply CONTRACTOR's stamp, signed certifying that review, verification of

Products required, field dimensions, adjacent construction Work, and coordination of information, is in accordance with the requirements of the Work and Contract Documents.

D. For each submittal for review, allow 15 days excluding delivery time to and from the CONTRACTOR.

E. Identify variations from Contract Documents and Product or system limitations which may be detrimental to successful performance of the completed Work.

F. Provide space for CONTRACTOR and ENGINEER review stamps.

G. Revise and resubmit, identify all changes made since previous submission.

H. Distribute copies of reviewed submittals as appropriate. Instruct parties to promptly report any inability to comply with provisions.

I. The processed submittals will be returned to the CONTRACTOR.

PART 2 - SCHEDULE

2.1 CONSTRUCTION PROGRESS SCHEDULES

A. Submit six copies of initial schedule within 10 days after the formal execution of the Contract.

B. Revise and resubmit as required.

C. Submit revised schedules with each Application for Payment, identifying changes since previous version.

D. Submit a horizontal bar chart with separate line for each section of Work or operation, identifying first workday of each week.

PART 3 - SHOP DRAWINGS AND MANUALS

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3.1 GENERAL

A. Shop drawings are defined as drawings, diagrams, illustrations, schedules, performance charts, brochures and other data prepared by the CONTRACTOR which illustrate how specific portions of the work shall be fabricated and/or installed.

B. Shop drawings are not part of the Contract Documents but are a supplementary means of communications to assist in the understanding of what the CONTRACTOR proposes to provide and to establish that whatever he intends to install either does or does not conform to the Drawings and Specifications.

C. In the instance of a request for a substituted item, the CONTRACTOR shall verify that it will fit into the space allocated to the originally required item giving due regard to all other trades' requirements. Where modifications to the Contract Documents are proposed, the CONTRACTOR must clearly indicate such deviation in writing in this transmittal letter. If the modification and/or substitutions are agreed to by the ENGINEER, the Contract Documents will be appropriately modified.

However, when additional work is required, the CONTRACTOR is advised that he must pay the ENGINEER for redesign to accommodate the revised substitution as well as pay other CONTRACTORS for extra work required by them for the change. No increase in DEVELOPER's construction cost will be allowed.

3.2 CATALOG SHEETS

A. For standard manufactured items considered by the ENGINEER as not requiring special Shop Drawings, the CONTRACTOR shall submit three copies of manufacturer's catalog sheets showing model numbers and illustrated cuts of the items to be furnished, scale details, sizes, dimensions, performance characteristics, capacities, wiring and control diagram and all other pertinent information. This information shall be highlighted on all three copies when appropriate.

B. The ENGINEER will retain two copies and return the third to the

CONTRACTOR submitting the catalog sheets.

3.3 SHOP DRAWINGS

A. The CONTRACTOR shall submit for review five white prints of shop and working drawings of materials fabricated especially for his Contract, and of equipment and materials for which such drawings are specifically requested.

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1. The CONTRACTOR shall submit three copies of a letter with the Shop Drawings for each piece of equipment signed and certified by an authorized representative of the Equipment Manufacturer which certifies that the subject equipment meets or exceeds the current OSHA/ANSI and local industrial codes for safety. The letter shall also specifically identify any exceptions that the Equipment Manufacturer has taken in not providing the required safety devices as they relate to the above codes.

B. Coordinate all equipment systems with the Drawings and submit a complete and coordinated shop drawing submission of the specific equipment system. All shop drawings related to the specific equipment system shall be submitted at the same time for review. The shop drawing submission shall provide the coordination of concrete foundation, piping, relative elevations, electrical, chemical facilities, instrumentation facilities, dimensions, structural changes, etc. in sufficient detail that the ENGINEER can adequately review the shop drawing. Equipment systems submitted which are incomplete or uncoordinated shall be returned to the CONTRACTOR, unchecked. A resubmission shall be made after equipment system shop drawings have been completed and coordinated.

Any required changes in the equipment system layout vs. the equipment system shown on the Drawings shall be provided by the CONTRACTOR at no added expense to the DEVELOPER or ENGINEER.

C. Prior to submitting drawings to the ENGINEER, the CONTRACTOR shall check thoroughly all such drawings to satisfy himself that the subject matter conforms to the Drawings and Specifications in all respects.

Drawings which are correct shall be marked with the date, checker's name and certification of the CONTRACTOR's approval, and then shall be submitted to the ENGINEER. Any Shop Drawings submitted without the CONTRACTOR's certification will be returned without review.

D. The ENGINEER will retain two copies and return three to the

CONTRACTOR.

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E. Shop Drawings shall show the principal dimensions, weight, structural and operating features, performance characteristics and wiring diagrams, space required, clearances, type and/or brand of finish or shop coat, grease fittings, etc., depending on the subject of the drawing. When it is customary to do so, when the dimensions are of particular importance or when so specified, the drawings shall be certified by the manufacturer or fabricator as correct for this Contract.

F. When so specified or if considered by the ENGINEER to be acceptable, manufacturer's specifications, catalog data, descriptive matter, illustrations, etc. may be submitted for review in place of shop and working drawings. In such case the requirements shall be as specified for shop and working drawings, insofar as applicable.

G. The CONTRACTOR shall be responsible for the prompt submission of all shop and working drawings in accordance with the shop drawing schedule so that there shall be no delay to the work due to the absence of such drawings.

H. No material shall be purchased or fabricated especially for this Contract until the required shop and working drawings have been submitted and reviewed as conforming to the Contract requirements. All materials and work involved in the construction shall then be as represented by said drawings.

I. The ENGINEER's review of shop and working drawings will follow a general check made to ascertain conformance with the design concept and functional result of the project and compliance with the information given in the Contract Documents. The CONTRACTOR is responsible for details and accuracy, for conforming and correlating all quantities and dimensions at the job site, for information that pertains solely to the fabrication processes or the techniques of construction, and for coordination of the work of all trades.

3.4 MANUALS

A. The CONTRACTOR shall submit for review four copies of all requested operating and maintenance manuals with the shop drawing submittals.

B. The ENGINEER will retain three copies and return the fourth to the respective CONTRACTOR.

C. Prior to final payment, provide six updated operating, maintenance manuals and parts lists for the DEVELOPER's use.

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3.5 FIELD DISTRIBUTION

A. The CONTRACTOR shall be responsible for the required number of processed drawings or catalog cuts for field distribution to all necessary

CONTRACTORS.

B. The CONTRACTOR shall be responsible for the prompt distribution of processed Shop Drawings to all other CONTRACTORS whose work must be coordinated with the work progress.

C. The CONTRACTOR shall have the overall responsibility for coordinating the necessary information to properly coordinate the work in accordance with Section 01010 - SUMMARY OF THE WORK.

PART 4 - SAMPLES

4.1 SUBMISSION OF SAMPLES

A. Unless otherwise specified, the CONTRACTOR shall provide samples in duplicate and identify each sample by an appropriate tag or label listing the names of the Project, the DEVELOPER, the ENGINEER, and the CONTRACTOR and/or Subcontractor as well as the exact identification of the sample. Tag or label shall be large enough to provide a blank space for review stamps.

B. Samples of items submitted for destruction tests or for use in testing mixture with other materials will not be returned. Review of these items will be given by letter.

C. When reviewed, one sample of each item not submitted for destruction will be returned to the CONTRACTOR and shall be kept and maintained in good condition in the CONTRACTOR's office at the project site for later use in comparison with material actually delivered for the work. When samples of large fabricated items or of costly items are required, reviewed samples may be installed in the work if the exact location of such samples is recorded on the Record Drawings.

PART 5 - CERTIFICATIONS AND TESTS

5.1 GENERAL

A. Two copies of certifications and reports of tests when required under the various sections of the Specifications, shall be submitted.

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SECTION 02221

HORIZONTAL DIRECTIONAL DRILLING

Installation of force main by use of horizontal directional drilling processes shall conform to the following specifications. Horizontal directional drilling shall refer to the process of pulling specified pipe at the designated location and grade by the use of equipment specifically designed to create a bore hole then ream the hole to the diameter necessary for the simultaneous insertion of the pipe.

PART 1 - GENERAL

1.1 Experience Requirements

Prior to the submission of bids, Contractors shall have completed the installment of at least 5,000 feet of directional drilling installation of piping. Field supervisory personnel employed by the Contractor shall have both the necessary experience and manufacturer training in the operation of the directional drilling equipment proposed to be used in the performance of the work. Bidders shall submit documentation showing conformance with the experience requirements at any time after the opening of the Bids. Information must include, but not be limited to, date and duration of work, location, project information (i.e., length, diameter, depth of installation, pipe material, etc.) and project owner information, (i.e., name, address, telephone number, contact person).

Bidders shall also submit a list of field supervisory personnel and their experience with directional drilling operations. At least one qualified field supervisor listed must be at the site and be responsible for all work at all times when directional drilling operations are in progress.

PART 2 - PRE-CONSTRUCTION SUBMITTALS

Before directional drilling work may commence, the Contractor shall submit working drawings and written procedures describing in detail the proposed method of installation. This will include, but not be limited to, size, capacity and setup requirements of equipment, location and siting of directional drilling and receiving pits and method of monitoring and controlling line and grade. If the Contractor determines that modifications to the method and equipment as stated in the original submittals are necessary, the Contractor will submit details of and reasons for such modifications.

Also, the Contractor shall submit the following information pertaining to the bentonite drilling products: a MSDS sheet(s), any necessary safety precautions and methods of removing spoils. Drilling operations must not interfere with, interrupt or endanger either surface or subsurface developments. The Contractor must comply with all applicable jurisdictional codes and OSHA requirements.

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PART 3 - MATERIALS FOR DIRECTIONAL DRILLING

3.1 Piping Materials

High-density polyethylene pipe (HDPE) shall be used for horizontal directional drilling.

3.2 Drilling Fluid

Drilling fluid shall be a mixture of water and bentonite clay. Information regarding other proposed drilling fluids shall be submitted to the Engineer for approval at least two (2) weeks before the starting work. Disposal of excess drilling fluid and spoils shall be the responsibility of the Contractor. Excess drilling fluid and spoils will be disposed at a location approved by the Engineer. Drilling fluid returns caused by fracturing of formations at locations other than the entry and exit points shall be minimized. The Contractor will immediately clean up any drilling fluid that is exposed through fractures.

The Contractor shall be responsible for making provisions for a clean water supply for the mixing of drilling fluid.

PART 4 - EXECUTION

4.1 Safety

At the location of the work, the Contractor shall be solely responsible for the safety of all parties. The selection of drilling procedures and equipment shall provide protection against electrical shock. Grounding mats, grounded equipment, hot boots, hot gloves, safety glasses and hard hats shall be used. The drilling equipment shall have an alarm system capable of detecting electrical current.

4.2 Pipe Installation

4.2.1 Drilling Equipment

The drilling equipment must be capable of placing the specified pipe at the planned line and grade without inverted slopes or deflection not in accordance with these Specifications. The equipment must be capable of pulling pipe from either the downstream or upstream manhole location. The number of pits shall be kept to a minimum. The equipment must be capable of boring the specified lengths, from manhole to manhole, in a single bore. Since pipe selection is dependent upon equipment pullback force, the proposal and approval of the use of equipment with a pullback rating greater than the maximum pullback force specified may invalidate the proposed piping and cause the need for the Engineer to redesign of the proposed piping. If the Engineer determines that a redesign of the proposed piping is necessary, the Contractor shall be responsible for all costs associated with the redesign of the proposed piping, including any costs associated with restocking, transport and complete replacement of materials. Throughout the insertion process, the Contractor shall constantly measure and record axial tension

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force readings on the pipe material, the insertion velocity, the mud flow circulation and exit rates and the length of pipe installed. Furthermore, the equipment must have a guidance system that has the capability of measuring inclination and azimuth. The guidance system must have an independent means of ensuring the accuracy of the installation. The Contractor shall demonstrate a viable method to eliminate accumulated error due to the inclinometer (pitch or accelerometer). The guidance system shall be capable of generating a plot of the borehole survey showing depths of the installed piping along its entire length. The scale of the plot of the borehole survey shall be the same as that shown on the project profile sheets. Depths shown on the plot of the borehole survey shall be accurate to 1/10 of a foot. The guidance system must have an inclination accuracy of 0.01 % of grade, a range of 1/10 of a foot, an azimuth repeatability of 0.1 % of grade and a range of 1/10 of a foot. The Contractor shall measure the repeatability of the inclination/azimuth before drilling commences.

4.2.2 Site Set-up

Equipment set-up shall be determined by the Contractor and submitted to the Engineer per the requirements as stated in this Section. The entry angle of the pilot hole and the boring process will maintain a curvature that does not exceed the allowable bending radii of the product pipe per the piping manufacturer. The set-up must account for pipe bending in the vertical and horizontal directions, as well as the set-up and spacing needed for the butt-fusion process.

4.2.3 Insertion of Pipe

The Contractor shall follow the pipeline alignment as shown on the drawings and in accordance with the specifications. In the event of difficulties encountered during boring operations that require the withdrawal of the directional drilling equipment from the pilot hole, the Contractor shall be allowed to withdraw and abandon the boring and begin a second attempt. With the approval of the Engineer, the Contractor may excavate at the point of the difficulty to correct problems. Unless otherwise directed by the Engineer, any unsuccessful attempts at performing the specified directional drill, including any pipe installation, and any excavations performed by the Contractor to remove obstructions to the drilling process shall be made part of the contract amount and shall not serve as basis for claims for additional compensation. The Engineer must be notified immediately if any obstruction is encountered that stops the forward progress of drilling operations. The Engineer shall review both the situation and the Contractors assessment thereof and then determine the feasibility of continuing drilling operations.

When it is determined that it is impossible to continue drilling operations, the Contractor will be allowed to abandon the completed portion in place, unless otherwise directed by the Engineer. Abandonment of installed piping shall be to the satisfaction of the Engineer. The Engineer shall determine the necessity of ordering an alternative construction method in place of horizontal directional drilling. The sizing of the pilot hole reamed to facilitate the insertion of the specified pipe shall be minimized to maximize support for the pipe. Reaming diameter shall not exceed 120% to 150% of the outside diameter of the pipe being installed. The pipe being pulled into the tunnel will be

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protected and supported so that it moves freely and is not damaged by stones and debris on the ground during installation. The Contractor will allow sufficient lengths of product pipe to extend pass the termination point to allow for contraction. Pulled HDPE pipe shall be allowed forty-eight (48) hours of stabilization prior to making any connections. Unless otherwise specified by the Engineer, connections of pipe installed by use of directional drilling methods to new manholes shall be made using press-seal boots. A tracer wire shall be installed with the pipe, regardless of pipe material. The tracer wire shall be either a solid hard drawn copper conductor or an annealed stranded stainless steel conductor. The conductor shall be insulated with high density polyethylene (HDPE) in accordance with the physical and electrical properties per ASTM D-1248. The Contractor shall appropriately size and install a tracer wire compatible with the pullback rating of the equipment being used, but in no case shall the wire be smaller than ten (10) gage. The tracer wire shall be brought to the surface within a six (6) inch PVC riser. The riser shall have a cast iron cap.

Revised September 2005

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SECTION 02225 - TRENCHING & BACKFILLING

1.0 GENERAL

1.1 Work included in this Section includes trenching and backfilling for underground pipelines and related structures only.

1.2 Reference Specifications are referred to by abbreviation as follows:

A. American Society for Testing and Materials.................................................. ASTM

B. American Association of State Highway and Transportation Officials .. AASHTO

C. Virginia Department of Transportation .......................................................... VDOT

1.3 The Contractor shall perform all construction operations in accordance with the U.S.

"Occupational Safety and Health Act of 1970", the Standards of the U.S. Department of

Labor, Occupational Safety and Health Administration and the latest amendments thereto.

1.4 The Contractor shall perform all construction operations in accordance with the "Rules and

Regulations Governing the Safety and Health of Employees Engaged in Construction" as adopted by the Safety and Health Codes Commission of the Commonwealth of Virginia and all latest revisions thereto and issued by the Department of Labor and Industry.

1.5 Store and use explosives in accordance with Federal, State and Local regulations. The

Contractor shall be responsible for and shall satisfactorily correct all damage resulting from use of explosives.

1.6 Within roadways, the Contractor shall provide compaction testing per VDOT standards. For construction within easements, the Contractor will provide compaction testing at

Department’s request at the Contractor’s expense.

1.7 Locate existing utilities, culverts and structures, above and/or below ground, before any excavation starts. Coordinate work with utility companies through MISS UTILITY.

Protect, maintain in service, and prevent damage to utilities not designated to be removed.

When utilities are encountered and are not shown on Drawings or when locations differ from those shown on Drawings, notify the Department for instructions before proceeding.

1.8 All excavation is unclassified and no additional payment will be allowed regardless of materials encountered.

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2.0 PRODUCTS

2.1 Pipe Bedding Fill

A. Granular fill shall meet requirements for coarse aggregates, ASTM C3, Size No. 57.

2.2 Select Backfill

A. Aggregate fill shall meet requirements for coarse aggregates, Section 203, VDOT

Specification, size No. 57.

B. Clean earth fill shall be an approved material free of debris, roots, frozen materials, organic matter, rock or gravel larger than 1" in any dimension or other harmful matter.

2.3 Rip-rap, where shown on the Drawings shall conform to VDOT Specification Sec. 414 "Dry

Rip-rap - Class I."

3.0 EXECUTION

3.1 Strip existing topsoil, leaf mold and organic materials, meeting topsoil requirements of

Section 02935 - Seeding. Deposit in storage piles separate from other excavated material.

3.2 Where the trench width exceeds the allowable width, the Contractor at his own expense shall provide for increased loads on pipe as directed by the Department.

3.3 Unauthorized excavation consists of the removal of material beyond indicated subgrade elevations or side dimensions without specific approval of the Department. Where unauthorized excavations occur, restore these areas to the elevations and dimensions shown on the Drawings with granular fill.

3.4 Where removal of unsatisfactory material is due to fault or negligence of the Contractor, by inadequate shoring or bracing, dewatering, material storage or other failure to meet specified requirements, any work deemed necessary by the Department to correct the faulty condition shall be performed at no additional cost to the County.

3.5 Trenches in public roadways. See Section 1, Volume 1 of these Standards for utility location.

A. Refer to Virginia Department of Transportation’s “Road and Bridge Specifications” for design and construction considerations.

B. Adequate protection of sewer lines shall include the following:

(1) Minimum 5 feet of cover over PVC pipe.

(2) Minimum 3 feet of cover over ductile iron.

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(3) Concrete caps shall be used where minimum covers cannot be attained.

3.6 Excavation.

A. Open trenches only so far in advance of pipe laying as permitted by Department. In no case will more than 500 ft. of trench may be open at one time. Trenches shall be backfilled at the end of each working day except where otherwise permitted.

B. The width of the trench at and below the top of the pipe shall not exceed the outside diameter of the pipe plus 18 inches except that for pipe 12 inches or less in diameter, the trench width shall not exceed 33 inches. Where this width is exceeded, Contractor shall provide for increased pipe loading as directed by the Department.

C. The trench walls above the top of the pipe may be sloped or the trench, above the top of the pipe, may be widened as necessary for bracing, sheeting and shoring.

Construction methods shall be subject to review and approval by the Department.

D. Excavate trenches for gravity lines to elevations shown on Contract Drawings.

Excavate trenches for pressure lines to elevations shown on Contract Drawings or to depths specified in other sections of this Division.

E. The bottom of the trench for gravity lines shall be as specified herein under "Pipe

Bedding".

F. The bottom of the trench for pressure lines shall be shaped to fit the bottom of the pipe as specified herein under "Pipe Bedding".

(1) Excavate for bell holes at each joint.

(2) Where rock is encountered, excavate a minimum of 6 inches below the bottom of the pipe for bedding.

G. Dewater excavation as necessary to provide proper protection. If deemed necessary, the Department may require continuous dewatering 24 hours per day by adequate pumpage or well-points until backfilling is completed. The method, and equipment used for dewatering shall be subject to the approval of the Department.

H. Where unsuitable soil is encountered, excavate to depth determined by the

Department and replace with select backfill thoroughly and uniformly compacted.

I. Where underground streams or springs are found, provide temporary drainage and notify the Department.

J. Remove from project site and dispose of material unsatisfactory for backfill, trash, and all excess material continuously with the progress of the work.

K. Remove shoring and all form materials, unless ordered to remain.

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L. Where rock is encountered so that a manhole, vault, or other structure will bear entirely on rock, it shall be used to support the foundation. Where only a part of the foundation would bear on rock, excavate to an even depth of 8 inches below the entire structure and backfill with aggregate fill and thoroughly compact.

M. Provide a minimum of 8 inches between rock excavation and sides of structures.

3.7 Sheeting

A. Maintain trench walls in a safe condition at all times. Provide sheeting, shoring, and bracing as necessary to prevent cave-in of excavation or damage to existing structures on or adjoining the site.

B. Establish requirements for trench shoring and bracing to comply with local codes and authorities having jurisdiction.

C. Maintain sheeting, shoring and bracing in excavations regardless of time period excavations will be open. Carry down sheeting, shoring and bracing as excavation progresses in accordance with the proper Department requirements.

D. Sheeting, shoring and bracing left in place shall be cut off to a depth of not less than

18 inches below grade.

3.8 Pipe Bedding

A. Bed all sewer pipes in accordance with bedding details as shown in Section 00870 -

Standard Details.

B. Except where otherwise shown on the Drawings, all gravity lines using rigid pipe such as ductile iron, etc. shall be Class B bedding as a minimum.

C. Except where otherwise shown on the Drawings, all gravity lines using flexible pipe such as PVC, etc. shall be Class B-2 bedding as a minimum.

D. Except where otherwise shown on the Drawings, all pressure lines using rigid pipe such as ductile iron, etc. shall be Class C-1 bedding as a minimum.

E. Except where otherwise shown on the Drawings, all pressure lines using flexible pipe such as PVC, etc. shall be Class C-1 bedding as a minimum.

F. Compact pipe bedding by tamping or rodding to prevent settlement.

3.9 Backfill

A. Backfill trench to a compacted depth of 1 foot over the pipe with select backfill in accordance with the details shown in Section 00870 - Standard Details. Backfill

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shall be placed by hand, uniformly on each side of the pipe and compacted in layers not exceeding 5". Do not backfill on muddy or frozen soil, or with muddy or frozen soil.

B. Backfill trench from 1 foot above the pipe to grade with clean earth fill free of stones not larger than 5" or 1/2 the layer thickness, whichever is smaller. Layers shall not exceed 12", except that under road shoulders and under existing or future paved areas, layers shall not exceed 8 inches. Backfill shall be compacted to the density specified for the areas in which it is located except that minimum compaction in any area shall be to the density of the adjacent soil.

C. Excavation depressions caused by removal of stumps or other clearing operations to firm subgrade, fill with clean earth fill and compact as specified.

D. Place backfill materials evenly adjacent to structures. Take care to prevent wedging action of the backfill against structures by carrying the material uniformly around the structure to approximately the same elevation in each lift.

E. Compact soil materials using equipment suitable for materials to be compacted and work area locations. Use power-driven hand tampers for compacting materials adjacent to structures.

F. Compact aggregate fill placed around manholes or other structures to required density.

3.10 Compaction

A. Percentage of maximum density requirements.

(1) Compact each layer of fill or backfill to not less than the following percentages of the maximum density at optimum moisture content as determined by ASTM D 1557 (AASHTO T-180).

95% beneath and within 25 ft. of buildings and structures, including those shown for future construction.

90% beneath pavements, walks, and road shoulders, including those shown for future construction.

85% in other unpaved areas.

3.11 Grading

A. Uniformly grade all areas within the limits designated on the Contract Drawings, including adjacent transition areas. Finish surfaces within specified tolerances with uniform levels or slopes between points where elevations are shown and existing grades.

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B. Finish all surfaces free from irregular changes.

C. Finish subgrade areas to receive topsoil to within 0.10 foot of required subgrade elevations.

D. Shape subgrade under walks to line, grade, and cross-section to within 0.10 ft. of required subgrade elevations.

E. Shape subgrade under pavement to line, grade, and cross-section to within 0.10 ft of required subgrade elevations.

F. Protect newly graded areas from traffic and erosion. Repair and reestablish grade in settled, eroded, or rutted areas to the specified tolerances.

G. Where compacted areas are disturbed by subsequent construction or adverse weather scarify the surface, reshape and compact to the required density. Use hand tamper for recompaction over underground utilities.

3.12 Utilities to be Abandoned or Removed

A. When underground utilities are to be abandoned in place, plug, cap, or seal with concrete at the "construction limits" or at points shown.

B. Remove underground utilities indicated on the Drawings to be removed and backfill resulting excavation with suitable material, compacted as specified. Plug, cap or seal utilities with concrete, at the construction limits or at points shown.

3.13 Erosion Control

A. Comply with local erosion control ordinance and with the "Virginia Erosion and

Sediment Control Handbook" by the Virginia Soil and Water Conservation

Commission to control erosion and sedimentation.

B. Submit erosion control plan to the County for review and approval prior to commencing any grading operations.

C. Install all applicable erosion and siltation control measures in accordance with approved plan prior to grading.

D. No more than 500 feet of trench shall be open at any one time.

E. All utility lines, not in streets, shall be mulched with hay or straw and seeded within

15 days after backfill.

F. Any disturbed area, not paved, sodded or built upon by November 15 is to be seeded

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on that date with oats, abruzzi rye, or equivalent and mulched with hay or straw.

G. Protect graded areas from the action of the elements. Settlement or other damage that occurs prior to acceptance of the work shall be repaired and grades satisfactorily reestablished.

H. Repair after cleanup: Upon completion of construction work and after spoils and debris have been removed; regrade any areas disturbed by operations.

3.14 Clean Up

A. Keep area of Work cleaned up at all times and promptly remove all materials and debris not intended for incorporation in the Work. Broom clean the surfaces of all paved areas immediately after backfilling operations.

B. Maintain backfilled trenches from the nuisance of dust, mud or settling during the entire length of the Contract and for a period of one year following Final Acceptance of the Work.

C. In the event the Contractor fails to satisfy these requirements to the satisfaction of the

Department, or otherwise prosecute the Work in a reasonable or proper manner, and after a reasonable period of time has elapsed after notification by the Department of unsatisfactory conditions, the Department reserves the right to employ outside services to take such corrective action as deemed necessary by the Department. The cost incurred in taking corrective actions will be deducted from any monies due the

Contractor by the Department or such other means of collection as may be available to the Department.

3.15 Preparation for Final Inspection

A. Locate and adjust all manholes, valve boxes, etc. to final grade and flush out all gravity pipe lines as necessary prior to final inspection by the Department. The costs of this work shall be included in the applicable bid prices.

3.16 Existing Driveways, Fences, Culverts, etc.

The Contractor shall return all driveways, fences, culverts, lawn areas, paved areas, etc. to the same condition existing prior to construction. Any culverts damaged during construction shall be replaced with new culverts at no cost to the Department.

END OF SECTION

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January 2025 02310-1

SECTION 02310 - JACK & BORE

1. GENERAL

1.1. GENERAL DESCRIPTION OF WORK

This work shall consist of boring and jacking operations related to the installation of water lines for specific road crossing across primary roads with casing as noted on the plans, where horizontal directional drilling is not permitted. The borings will be completed in accordance with the construction plans and the VDOT Road and Bridge Specifications.

2. PRODUCTS

2.1. PIPE

2.1.1. Steel casing shall be used for the installation of waterline for all road crossings as noted on the plans.

2.1.2. The steel casing shall new and unused and conform to ASTM A-139 or ASTM A53 with a minimum wall thickness of 0.1875 in and have straight cut beveled edges suitable for welding or threaded. The hydrostatic test for such pipe will not be required.

2.1.3. The pipe for jacking will be of sufficient strength, diameter and wall thickness to accomplish the specific task without deflection or damage.

2.1.4. The Steel casing should conform to…