NC0086924_Directional Bore and Discharge Header_20000522

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DIRECTIONAL BORE AND DISCHARGE
HEADER FOR THE REVERSE OSMOSIS
WATER TREATMENT FACILITY
CONTRACT V
TYRRELL COUNTY, NC
DENR SUBMITTAL
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PREPARED BY
HOBBS, UPCHURCH & ASSOCIATES, P.A.
2522 S. CROATAN HIGHWAY, SUITE 2A
NAGS HEAD, NORTH CAROLINA
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MAY 2000 i
MAY 3 0 2000
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DFNR - WATER QUALITY

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DIRECTIONAL BORE AND DISCHARGE HEADER FOR THE
REVERSE OSMOSIS WATER TREATMENT FACILITY
'
TYRRELL COUNTY
SPECIAL PROVISIONS
'
01. The directional bore for thisJro'ect is intended to avoid disturbance of the wetlands and
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to minimize disturbance of the waters of the Albemarle Sound.
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The Contractor shallrform all work under this contract in accordance ce vvith conditions set forth
in the CAMA Permit.
02. Location of directional borehole shall be coordinated with and approved by the Engineer
prior to commencing boring operations.
03. No vehicular traffic or construction activities are allowed in wetlands.
'
04. The Contractor shall restore all areas disturbed by construction activities to their original
condition.
' 05. The Contractor shall install a containment structure around the borehole exit to hold
excess drilling fluids and spoils. The drilling fluids and spoils shall be pumped from the
' containment structure to the shore where the material will be removed and disposed of. No
drilling fluids or spoils shall be stored on site. Excess drilling fluid and spoils shall not be
discharged into sanitary or storm drain systems, ditches or waterways.
' 06. The Contractor shall submit details of the spoils containment structure and methods that
will be used to ensure that spoils are not discharged from the site.
' 07. The linear footage provided in the Bid Form is an estimate of the distance required to
avoid disturbance of the wetland areas and to locate the discharge header assembly 100' from
' the edge of water.
08. The Contractor is responsible for connecting the new HDPE pipe to the existing 4" gate
' valve. The Contractor shall remove the existing plug, connect to the 4" gate valve, and provide
all fittings required.
09. COMPLETION TIME: Work shall be commenced with adequate forces on the date
stipulated in the Notice to Proceed and the Project shall be fully completed within the following
times:
' 75 Consecutive Calendar Days
' A two-year warranty period shall begin on the date of substantial completion as defined by the
General Conditions.
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' If it becomes apparent that work is not proceeding to meet the project schedule, at the Owner's
request, the Contractor shall provide additional crews and/or crew members to assure
' completion with the allocated time.
10. LIQUIDATED DAMAGES: If the project remains incomplete after the established
' time of completion, the liquidated damages sustained by the Owner shall be $300.00 per day.
The Contractor will be liable for additional inspection costs incurred by the Owner for the time
' by which contract time is exceeded.
11. SEDIMENTATION AND EROSION CONTROL: The Contractor is instructed to
' control erosion and sedimentation run-off with methods approved by the Engineer during the
course of construction of this project. The Contractor shall implement approved erosion and
sedimentation control measures whenever necessary. Cost for erosion and sedimentation
' control shall not be paid directly but shall be included in the line item for pipe installation in the
Schedule of Bid Items. The Contractor is reminded that all work shall meet all applicable
requirements of the rules and regulations of Erosion and Sedimentation Control as published by
' the Department of Natural Resources and Community Development, North Carolina
Sedimentation Control Commission. The Contractor shall be required to obtain written closeout
from the Land Quality Section - NCDENR.
12. SEEDING AND MULCHING: Payment for seeding and mulching the areas disturbed
during construction shall not be made directly but shall be included in the cost of the discharge
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main.
13. INSTALLATION WITHIN NCDOT RIGHTS-OF-WAY: All work performed within
' North Carolina Department of Transportation rights-of-way shall be performed in strict
accordance with the NCDOT Construction and Maintenance Operations Supplement to the
Manual on Uniform Traffic Control Devices. The Contractor shall be responsible for
' performing the work and adhering to the Right -of -Way Encroachment Contract Special
Provisions. The Contractor shall be required to obtain written close-out from NCDOT.
' 14. WORK SCHEDULE: Prior to commencing work, the Contractor will submit to the
Engineer a schedule delineating the order in which the work will be performed and approximate
beginning dates for each.
' 15. SUBMITTALS: Approval for all shop drawings and submittals will be obtained before
the Contractor is allowed to begin work. The Contractor shall submit six sets of all shop
' drawings and certification required by this Contract.
16. COMPACTION OF TRENCHES: All trenches shall be compacted to 95% density as
t required by NCDOT. Any density test requested by the Engineer or NCDOT shall be paid for
by the Contractor.
' IT AS -BUILT DRAWINGS AND SPECIFICATIONS AT THE JOB SITE: The
Contractor shall maintain, in readable condition at the job site, one complete set of working
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' drawings and specifications for his work, including all shop drawings. Such drawings and
specifications shall be available for use by the Owner or his representative at all times. This set
shall be marked, or notes acceptable to the Engineer provided, in order to reflect as -built
' conditions, changes indicating such conditions shall be kept current at all times. Upon
completion of the project, this complete set of drawings and specifications or notes, showing as -
built conditions, shall be returned to the Owner or his representative.
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DIRECTIONAL BORE AND DISCHARGE HEADER FOR THE
REVERSE OSMOSIS WATER TREATMENT FACILITY
' TYRRELL COUNTY
SECTION 1
' SITEWORK ON DISCHARGE
' 01. SCOPE: This section shall include the clearing and grubbing of all required
construction areas together with disposal of materials, site preparation, and clean up as
specified herein.
02. SITE PREPARATION:
' A. Existing Facilities: The Contractor shall provide protection for all existing
structures, buildings, and utilities against all construction activity. The Contractor shall
' protect and preserve the Owner harmless against damage and claims resulting from these
activities.
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B. Streets and Highways: Effective barricades, danger signals and signs on all
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streets and in other locations where required for the protection of the work and the safety of
the public, shall be provided, erected and maintained by the Contractor. Barricades and
obstructions that encroach on, or are adjacent to, public rights of way shall be properly
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lighted between the hours of sunset and sunrise. The Contractor shall conform to all city,
state and local laws and regulations in the use of streets and highways. The Contractor shall
be responsible for all damages occurring due to neglect or failure to meet these
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requirements. When dictated by conditions that might endanger the public, a watchman
shall be provided to fulfill the requirements stated herein.
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C. Traffic Flow and Continuance of Services: The work shall be arranged in a
manner that will cause a minimum of disturbance to vehicular and pedestrian traffic.
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Adequate ingress and egress to both private and public property shall be provided by the
Contractor during all stages of construction. Without written approval from the city or
utility company, existing services shall not be interrupted by the construction work.
03. PRELIMINARY WORK:
'
A. Valuable Trees and Shrubs: When the construction work involves the
removal of valuable trees and shrubs on existing public rights of way, the work shall be
done in cooperation with the city, county, or state.
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B. Protection of Private Property: The Contractor shall provide protection for
privately owned trees and shrubs bordering the right of way and shall take full responsibility
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for any damage that does occur.
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' C. Existing roads, subject to interference by the Contractor's work, shall be kept
open in all cases. The Contractor shall provide, erect and maintain, at his own expense,
effective barricades on which shall be placed acceptable warning and/or detour signs at each
' side of any road obstruction caused by the operations of the Contractor. All barricades shall
comply with OSHA requirements and State or local laws, whichever is most strenuous.
' D. The Contractor shall protect all public roads which may be damaged by,
interfered with, or given undue wear by reason of the work, and shall repair or replace them
' if damaged, at his own expense, to the satisfaction of governmental authorities and the
Owner.
' E. When questions arise as to safe methods or suitable protection, the
Contractor shall confer with the Owner but full responsibility for results shall rest with the
Contractor.
' 04. DAMAGES AND COMPLAINTS
A. The Contractor shall provide protection which, in the opinion of the Owner,
will prevent damage to the property, such as lawns, roads, fences, buildings, drains, and
pipelines by passage of his equipment, and shall assume sole responsibility for damages
' thereby incurred and shall notify the Owner immediately if and when damage occurs. The
Owner shall be promptly notified of all pipelines that are broken by the Contractor's
operations and immediate arrangements made for repairs. Damage to property shall be
' repaired to a condition that is as good or better than original.
B. The Contractor shall promptly comply with all reasonable requests of the
' landowners and tenants relative to access to right of way and to general conduct of his work;
however, he shall not enter into any agreements with property owners or tenants on other
matters such as the saving of logs or firewood or the disposal of brush without prior
' approval of the Owner and Engineer. In cases of disagreement between any landowner or
tenant and the Contractor, the Contractor shall notify the Owner and Engineer immediately
and shall not perform any further operations against the objections of the property owner or
tenant without prior approval of the Owner and Engineer.
05. CLEARING AND GRUBBING: Clearing and grubbing shall be performed in areas
' indicated and where required for construction. It shall include the complete removal and
disposal of all brush, weeds, timber, stumps, rubbish, and all other obstructions. All such
material shall be removed to a depth of at least 1' below finished grade. In clearing and
' grubbing areas where excavation is done, all timber, roots, or stumps removed that are
exposed by said excavation shall be removed to a depth of one foot below the excavated
surface.
' 06. DISPOSAL OF CLEARED AND GRUBBED MATERIAL: All refuse from the
clearing and grubbing operation shall be disposed of either by burning or removal to a dump
area that is approved by the Owner. The Contractor shall obtain a burning permit from the
city fire chief before any burning is started. Burning, if approved, shall be done in such a

manner that does not create hazards such as damage to existing structures, trees and
vegetation, interference with traffic and construction in progress. When the construction site
is outside the city limits and burning is required, proper permits shall be obtained from the
city, county, or state officials. All disposal by burning shall be kept under constant
supervision until all fires have been extinguished. All burning shall comply with all state
and local laws relative to the building of fires.
07. ARCHAEOLOGICAL: If the Contractor, during the prosecution of work,
encounters an unidentified archaeological or other cultural resource within the work area,
the Contractor shall immediately stop work and notify the Engineer.
08. PAYMENT: Work under this section is incidental to the work in this Contract.
A. Vegetation and Ornamental Items: The Contractor shall be fully responsible
for protection of or removal and replacement of ornamental trees, shrubs and grasses,
decorative items such as retaining walls and all other items with no additional payment or
compensation. Seeding and sodding shall be handled as outlined in Section 8.

DIRECTIONAL BORE AND DISCHARGE HEADER FOR THE
REVERSE OSMOSIS WATER TREATMENT FACILITY
' TYRRELL COUNTY
' SECTION 2
PIPE FOR DISCHARGE
' 01. SCOPE: This specification covers high density polyethylene (PE 3408) pressure
pipe intended for the transportation of reverse osmosis treatment plant concentrate
discharge.
Unless otherwise noted, the materials listed below are acceptable to the Owner for use.
' Should the Contractor desire to use other materials not listed in these specifications, written
permission must be obtained from the Owner's Engineer.
' All material shall be free from defects impairing strength and durability and be of the best
commercial quality for the purposes specified. It shall have structural properties sufficient
to safely sustain or withstand strains and stresses to which it is normally subjected and be
' true to detail.
02. SUBMITTALS: The Contractor shall submit to the Engineer six (6) copies of all
' submittal data for review and/or approval. Submittals shall include at a minimum: (1) the
manufacturer's name, (2) type of material, (3) ASTM, ANSI, AWWA or other quality
standard and (4) pressure class. If the materials do not meet the quality standards specified,
' the submittals will be rejected and other materials submitted as specified. The Contractor
must obtain approval of all pipe materials prior to commencing construction.
' The Contractors shall submit to the Engineer two (2) copies of a certificate of inspection
from the pipe manufacturer that the pipe supplied has been inspected at the plant and meets
the requirements of these specifications.
03. PIPE DELIVERY, STORAGE AND HANDLING: Units shall be delivered,
handled, and maintained in a manner to avoid damage to the pipe. The pipe shall be stored
' in an open area on high, well -drained land not subject to flooding, mud, or other means of
contamination.
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' 04. HIGH DENSITY POLYETHYLENE PIPE:
' A. General: Materials used for the manufacturing of polyethylene pipe and
fittings shall be PE 3408 High Density Polyethylene (HDPE) meeting the ASTM D3350
cell classification of 345434C.
' The material used in the production of potable water pipe shall be approved by the National
Sanitation Foundation (NSF).
' B. Pipe Thickness: The material shall have a minimum Hydrostatic Design
Basis (HDB) of 1600 psi at 73°F when tested in accordance with PPI TR -3 and shall be
' listed in the name of the pipe and fitting manufacturer in PPI TR -4.
Polyethylene pipe shall be manufactured in accordance with AWWA C906 for sizes 4"
through 54".
Permanent identification of piping service shall be provided by co -extruding longitudinal
' blue stripes into the pipe's outside surface. The striping material shall be the same material
as the pipe material except for color.
C. Joints: Butt fusion or Electrofusion welded in accordance with ASTM
D3261.
D. Marking: The net weight, pressure class or nominal thickness, sampling
period and manufacturer shall be marked on each pipe.
05. METHOD OF MEASUREMENT: Pipe shall be measured per linear foot, complete
in place and accepted, including the furnishing of all labor, tools, materials, and equipment
necessary for trenching, laying, jointing, testing, backfilling, connections to existing mains,
and all other necessary incidentals.
06. PAYMENT: Payment shall be made at the contract unit price on items measured as
described above.
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DIRECTIONAL BORE AND DISCHARGE HEADER FOR THE
REVERSE OSMOSIS WATER TREATMENT FACILITY
ITYRRELL COUNTY
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SECTION 3
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GUIDED BORING INSTALLATION
A. Scope: This section includes the installation of the discharge main by guided
boring, including connecting to the existing discharge main. The Contractor will furnish all
' labor, components, materials, tools, and appurtenances necessary or proper for the
performance and completion of the contract.
'
B. General Description of Method: Guided boring is a method of trenchless
construction using a surface launched steerable drilling tool controlled from a mobile
drilling frame, and includes a field power unit, mud mixing system and mobile spoils
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extraction system. The drilling frame is sited and aligned to bore a pilot borehole that
conforms to the planned installation of the main. The drilling frame is set back from an
access pit that has been dug (typically at the location of a proposed manhole or other
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appurtenance) and a high-pressure fluidjet toolhead that uses a mixture of bentonite clay and
water is launched. Pits are normally dug at the start point and endpoint of the proposed pipe
installation and are used to align the toolhead, attach other equipment, and to collect and
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remove excess spoils. Using an electronic guidance system, the toolhead is guided through
the soil to create a pilot borehole. Upon reaching the endpoint joint, the toolhead is removed
and a reamer with the product pipe attached is joined to the drill string and pulled back
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through the borehole. In large diameter installations, pre -reaming of the borehole will
usually be done prior to attaching the product pipe for the final pullback. A vacuum spoils
extraction system removes any excess spoils generated during the installation. The
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connections, manholes, or other appurtenances are then completed at both the start point and
endpoint locations and the surface restored to its original condition.
C. Qualifications:
1. Guided boring Contractors will have actively engaged in the
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installation of pipe using guided boring for a minimum of three years.
2. Field supervisory personnel employed by the Guided Boring
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Contractor will have at least three years experience in the performance of the work and tasks
as stated in the contract document.
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ID. Submittals:
' 1. Submit documentation showing three years of guided boring
experience. Information must include, but not be limited to, date and duration of work,
location, pipe information (i.e., length, diameter, depth of installation, pipe material, etc.),
' project owner information, (i.e., name, address, telephone number, contact person), and
the contents handled by the pipeline (water, wastewater, etc.).
' 2. Submit a list of field supervisory personnel and their experience
with guided boring operations. At least one of the field supervisors listed must be at the
site and be responsible for all work at all times when guided boring operations are in
' progress. Guided boring operations will not proceed until the resume(s) of the
Contractor's field supervisory personnel have been received and reviewed by the Project
Engineer.
' 3. Submit the following drawings and documents:
' a. Working drawings and written procedure 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 drilling and
' receiving pits; dewatering if applicable; method of fusion and type of equipment for
joining pipe; type of cutting tool head; and method of monitoring and controlling line and
depth. If the Contractor determines that modifications to the method and equipment as
' stated in the submittal is necessary during construction, the contractor will submit a plan
describing such modifications, including the reasons for the modification.
' b. Bentonite drilling mud products information (MSDS);
special precautions necessary; method of mixing and application; and method of
removing spoils.
' E. Site Conditions:
' 1. Drilling operations must not interfere with, interrupt, or endanger
surface and activity upon the surface.
' 2. Contractor must comply with all applicable jurisdictional codes
and OSHA requirements.
' 3. When rock stratum, boulders, underground obstructions, or other
soil conditions that impede the progress of drilling operations are encountered, the
' Contractor and Engineer shall review the situation and jointly determine the feasibility of
continuing drilling operations, making adjustments or switching to an alternative
construction method.

' b. Disposal of excess drilling fluid and spoils will be the
responsibility of the Contractor who must comply with all relevant regulations, right-of-
way, work space and permit agreements. Excess drilling fluid and spoils will be disposed
' at an approved location. The Contractor is responsible for transporting all excess drilling
fluid and spoils to the disposal site and paying any disposal costs. Excess drilling fluid
and spoils will be transported in a manner that prevents accidental spillage onto
roadways. Excess drilling fluid and spoils will not be discharged into sanitary or storm
drain systems, ditches or waterways.
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C. Drilling fluid returns (caused by fracturing of formations)
at locations other than the entry and exit points will be minimized. The Contractor will
immediately clean up any drilling fluid that surfaces through fracturing.
d. Mobile
spoils removal equipment capable of quickly
' removing spoils from entry or exit pits and areas with returns caused by fracturing will be
present during drilling operations to fulfill the requirements of paragraphs b and c above.
'
02. MATERIALS:
'
A. Material requirements:
1. Pipe and fittings.
'
a. High Density Polyethylene Pipe (HDPE) and fittings will
be used in accordance with the materials specifications. All additional appurtenances
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such as tees, gaskets, flange adaptors, etc. will meet the material specifications. The
Contractor will supply the pipe and fittings and will include its price in the bid. All pipe
installed by guided boring will be joined by an approved butt fusion or electrofusion
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technique according to the manufacturers specifications.
b. HDPE pipe shall be produced from resins with a material
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designation PE3408, and a cell classification PE334434 as specified within ASTM
D3350, and dimensions and workmanship as specified by ASTM F714. It will also meet
the requirements of AWWA ASTM D3350. Pipe will be legibly marked at intervals of
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no more than five feet with the manufacturer's name, trademark, pipe size, HDPE cell
classification, appropriate legend such as SDR 11, ASTM D3035, AWWA C901 or
C906, date of manufacture and point of origin. Pipe not marked as indicated above will
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be rejected.
2. Drilling fluid.
a. Drilling fluid will be a mixture of water and bentonite clay.
The fluid will be inert. The fluid should remain in the tunnel to ensure the stability of the
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tunnel, reduce drag on the pulled pipe, and provide backfill with the annulus of the pipe
and tunnel.
' b. Disposal of excess drilling fluid and spoils will be the
responsibility of the Contractor who must comply with all relevant regulations, right-of-
way, work space and permit agreements. Excess drilling fluid and spoils will be disposed
' at an approved location. The Contractor is responsible for transporting all excess drilling
fluid and spoils to the disposal site and paying any disposal costs. Excess drilling fluid
and spoils will be transported in a manner that prevents accidental spillage onto
roadways. Excess drilling fluid and spoils will not be discharged into sanitary or storm
drain systems, ditches or waterways.
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C. Drilling fluid returns (caused by fracturing of formations)
at locations other than the entry and exit points will be minimized. The Contractor will
immediately clean up any drilling fluid that surfaces through fracturing.
d. Mobile
spoils removal equipment capable of quickly
' removing spoils from entry or exit pits and areas with returns caused by fracturing will be
present during drilling operations to fulfill the requirements of paragraphs b and c above.

' e. The Contractor will be responsible for making provisions
for a clean water supply for the mixing of drilling fluid.
' 03. EXECUTION:
' A. General:
1. The Engineer shall be notified immediately if any obstruction is
' encountered that stops the forward progress of drilling operations.
2. Dewatering of pits and excavations must meet the general
provisions and specifications for new water main construction in effect at Dare County.
The type of dewatering method will be at the option of the Contractor. When water is
encountered, the Contractor must provide a dewatering system of sufficient capacity to
' remove water, keeping any excavations free of water until the backfill operation is in
progress. Dewatering shall be performed in a manner that removal of soil particles is
held to a minimum.
B. Preparation:
' 1. Excavate required pits in accordance with the working drawings.
2. The drilling procedures and equipment shall provide protection of
' workers, particularly against electrical shock. As a minimum, grounding mats, grounded
equipment, hot boots, hot gloves, safety glasses, and hard hats shall be used by crew
members. The drilling equipment shall have an audible alarm system capable of
' detecting electrical current.
3. Removal of trees, landscaping, pavement, or concrete shall be
' performed as specified.
C. Guided Boring Operations:
' 1. Equipment.
' a. The drilling equipment must be capable of placing the pipe
within the limits indicated on the contract plans.
' b. Guided boring equipment shall consist of a surface
launched steerable drilling tool controlled from a mobile drilling frame, and include a
field power unit, mud mixing system and mobile spoils extraction system.
'
C. The number of accessits shall be kept to a minim
p p um and
the equipment must be capable of boring the following lengths in a single bore. The
' guided boring system will have the capability of boring and installing a continuous run
without intermediate pits of a minimum distance for the following pipe diameters:
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Product Pipe Size Minimum Boring Distance
I1 — 1 '/Z inches 500 feet
' Horizontal position: ± 2 inches at 18-96 inches of depth
± 4 inches at 97-144 inches of depth
' ± 6 inches at 145-180 inches of depth
± 12 inches at 181-300 inches of depth
± 24 inches at 301-480 inches of depth
' e. Equipment set-up requirements shall be prepared by the
Contractor and submitted to the Engineer per the requirements as stated under
' "Submittals."
f. Required Safety Equipment: During drilling operations, all
' equipment shall be effectively grounded and incorporate a system that protects operating
personnel from electrical hazards. The system shall be equipped with an audible alarm
that can sense if contact is made with an energized electric cable. Proper operation of the
' alarm system will be confirmed prior to the drilling of each tunnel. All equipment will be
connected to ground with a copper conductor capable of handling the maximum
anticipated fault current. Crew members operating drilling equipment and handling rods
' will do so while standing on grounded wire mesh mats, ensuring that all equipment is
grounded, and wearing hot boots, hot gloves, safety glasses and hard hats. Crew
members operating handheld locating equipment will wear hot boots.
g. Equipment set-up requirements and locations shall be
determined by the Contractor and submitted to the Engineer per the requirements as
' stated under "Submittals."
10
2 — 4 inches
450 feet
6 inches
400 feet
'
8 inches
350 feet
10 — 16 inches
300 feet
'
d. The guidance system shall have the capability of measuring
vertical (depth) position, horizontal position and roll. The guidance system must meet
'
the following specifications in soft homogenous soils:
Accuracy
'
Vertical position: ± 1 inch at
18-96 inches of depth
± 2 inches at
97-144 inches of depth
± 4 inches at
145-180 inches of depth
'
± 6 inches at
181-300 inches of depth
± 10 inches at
301-480 inches of depth
' Horizontal position: ± 2 inches at 18-96 inches of depth
± 4 inches at 97-144 inches of depth
' ± 6 inches at 145-180 inches of depth
± 12 inches at 181-300 inches of depth
± 24 inches at 301-480 inches of depth
' e. Equipment set-up requirements shall be prepared by the
Contractor and submitted to the Engineer per the requirements as stated under
' "Submittals."
f. Required Safety Equipment: During drilling operations, all
' equipment shall be effectively grounded and incorporate a system that protects operating
personnel from electrical hazards. The system shall be equipped with an audible alarm
that can sense if contact is made with an energized electric cable. Proper operation of the
' alarm system will be confirmed prior to the drilling of each tunnel. All equipment will be
connected to ground with a copper conductor capable of handling the maximum
anticipated fault current. Crew members operating drilling equipment and handling rods
' will do so while standing on grounded wire mesh mats, ensuring that all equipment is
grounded, and wearing hot boots, hot gloves, safety glasses and hard hats. Crew
members operating handheld locating equipment will wear hot boots.
g. Equipment set-up requirements and locations shall be
determined by the Contractor and submitted to the Engineer per the requirements as
' stated under "Submittals."
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I2. Pilot Hole Boring.
' a. 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.
' b. Alignment Adjustments and Restarts.
(1) The Contractor shall follow the pipeline alignment
as shown on the Drawings, within the specifications stated. If adjustments are required,
' the Contractor shall notify the Engineer for approval prior to making the adjustments.
' 3. Installing Product Pipe
a. After the pilot hole is completed, the Contractor shall
' install a swivel to the reamer and commence pullback operations. Pre -reaming of the
tunnel may be necessary and is at the option of the Contractor.
' b. Reaming diameter will not exceed 1.5 times the diameter of
the product pipe being installed.
C. The product pipe being pulled into the tunnel will be
protected and supported so that it moves freely and is not damaged by stones and debris
on the ground during installation.
' d. Pullback forces will not exceed the allowable pulling forces
for the product pipe.
' e. The Contractor shall allow sufficient lengths of product
pipe to extend past the termination point to allow connections to the diffuser assembly.
' Pulled pipe will be allowed 24 hours of stabilization prior to making tie-ins. The length
of extra product pipe will be at the Contractor's discretion.
' D. Clean-up: The Contractor shall maintain the work site in a neat and
orderly condition throughout the period of work and after completing the work at each
site, remove debris, surplus material and temporary structures erected by the Contractor.
' The site shall be restored to a condition equal to the existing condition prior to being
disturbed.
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' DIRECTIONAL BORE AND DISCHARGE HEADER FOR THE
REVERSE OSMOSIS WATER TREATMENT FACILITY
' TYR.RELL COUNTY
SECTION 4
' SLIP-ON DIFFUSER CHECK VALVES
01. SCOPE: This section shall include the furnishing of four (4) Diffuser Check Valves
as shown on the drawings and specified herein.
' 02. SUBMITTALS:
' A. Submit six (6) copies of product literature that includes information on the
performance and operation of the valve, materials of construction, dimensions and weights,
elastomer characteristics, flow data, headloss data, jet velocity data, and pressure ratings.
' B. Provide shop drawings that clearly identify the valve dimensions.
03. QUALITY ASSURANCE:
A. Supplier shall have at least ten (10) years experience in the manufacture of
' "duckbill" style elastomeric valves, and at least five (5) years experience with diffuser
applications, and shall provide references and a list of installations upon request.
' 04. "DUCKBILL" ELASTOMERIC DIFFUSER VALVES:
A. Diffuser Check Valves are to be all rubber of the flow operated check type
' with a slip-on connection. The Check Valve is designed to slip over the specified pipe
outside diameter and attached by means of vendor furnished stainless steel clamps. The port
area shall contour down to a duckbill which shall allow passage of flow in one direction
' while preventing reverse flow. The flange and flexible duckbill sleeve shall be one-piece
rubber construction with nylon reinforcement.
B. The Diffuser Check Valves shall provide a variable orifice nozzle to
minimize variation in jet velocity with flow. The jet velocity vs. flow characteristics shall
follow a non-linear curve which maximizes jet velocity at low flow rates compared to fixed
orifice nozzles. Manufacturer shall have flow test data on diffuser check valves obtained by
an independent test facility verifying pressure drop and jet velocity vs. flow.
C. Company name, plant location, valve size, and serial number shall be bonded
to outside of the check valve. Valves shall be manufactured in the USA.
12

II
'
05. FUNCTION:
A. When line pressure inside the valve exceeds the backpressure outside the
valve by a certain amount, the line pressure forces the bills of the valve open, allowing flow
to pass. This restriction causes an increase in the jet velocity of the discharge, while the
shape of the opening creates a flattened plume -shaped discharge pattern to increase
'
dispersion. When backpressure exceeds the line pressure by at the same amount, the bills of
the valve are forced closed.
06. MANUFACTURER:
A. All valves shall be of the Series TF -D as manufactured by the Red Valve
Co., Inc. of Carnegie, PA 15106 or approved equal.
'
07. INSTALLATION:
A. Valve shall be installed in accordance with manufacturer's written
'
installation and Operation Manual and approved submittals.
08. MANUFACTURER'S CUSTOMER SERVICE:
'
A. Manufacturer's authorized representative shall be available for customer
service during installation and start-up, and to train personnel in the operation, maintenance
'
and troubleshooting of the valve.
B. Manufacturer shall also make customer service available directly from the
'
factory in addition to authorized representatives for assistance during installation and start-
up, and to train personnel in the operation, maintenance and troubleshooting of the valve.
1
13

BULL BAY
1
oamm
REVERSE OSMOSIS PLANT
CONCENTRATE DISCHARGE
4" PVC DISCHARGE MAIN
0'
o ,
TYRRELL COUNTY WTF
sesselsomm
r
• SEAL
14996 i
SR
T WE�'�C'
VICINITY AND LOCATION MAP 00
TYRRELL CO. WATER SYSTEM IMPROVEMENTS FIGURE 1
R.O. PLANT CONCENTRATE DISCHARGE
HOBBS, UPCHURCH&ASSOCIATES, P.A. SCALE: DESIGNED: ETW
COMM 7AG BCAEERS 1 =600 DRAWN: DCJ
N4GSh'4Q, NORTH CAROLAM 27W DATE: CHECKED: ETW
2521 S CROATAN MW, SWE24 MAY 2000
29-441-M FAX 252_441-21010 SHEET: 1 O F 4

n
1
4" PVC DISCHARGE MAIN
(CONTRACT III BY OTHERS)
EXISTING RIPRAP
BULKHEAD
EDGE OF WATER
- SEAL
BULL BAY
= 14996
�%�•;`� �.•r'Q� - - lo'— - 100'
WEP
20' UTILITY
EASEMENT STA. 0+00 DISCHARGE
WATER MAIN
_
BEGIN 125' 4" HDPE
DIRECTIONAL BORE
STA. 0+00
PLAN
REMOVE EX. 4" PLUG
TIE TO
EX
STI N
5
4" G
TE VALVE
5
\
E
ISTI
G GRADE
APPROX.
MW
=2.
'
' Mir
COVER
4
DISCHARGE
HEADER
—5
-5
EW
251-
HDRE
IREC
ION
L BORE
PPE
_10
-00
-10
0+00 1+00
2+00
PROFILE
TYRRELL CO. WATER SYSTEM IMPROVEMENTS
FIGURE 2
R.O. PLANT CONCENTRATE DISCHARGE
HOW Uf MOCH & A550CIA TES, P.A.
SCALE: 1 "= 50' (H)
DESIGNED: ETW
C1GVIi9l' 7AGEAO11 EW
1 "=5' V
DRAWN: DCJ
AWLS 1f4Q, ACTH CAf aKOI VW
DATE:
CHECKED: ETW
252'18 p9L14TAN W, SWE2A
252-441-3+ FAX 252-4*2M
MAY 2000
SHEET: 2 OF 4

10'
CONCRETEI
I 3'
ANCHOR r
I 6"
\T-
4" HDPE DIRECTIONAL
BORE PIPE
3" DIFFUSER CHECK VALVES
(4 TOTAL)
PLAN
2"X 1 /4' S.S. STRAP w/
6"X3/4" S.S. ANCHOR BOLTS,
WASHERS & NUTS
PROVIDE NEOPRENE PADS BETWEE=
N S.S. STRAPS AND HOPE PIPE
AND BETWEEN CONCRETE ANCHOR AND HDPE PIPE.
4" 30' HOPE
MITTERED ELL I
_/
30 we
4" HDPE DIRECTIONAL
BORE PIPE
SEAL
14996
18"
12" HDPE DIFFUSER
1 MANIFOLD
15T/TYP
T Ex15T1aD GRADE
4" HDPE DIRECTIONAL I
BORE PIPE I
SECTION A—A
A HDPE END CAP
A 1$" `
3 ~I
EXISTING GRADE
ELEVATION
s1z� 4" DISCHARGE HEADER DETAIL
TYRRELL CO. WATER SYSTEM IMPROVEMENTS
R.O. PLANT CONCENTRATE DISCHARGE
A
HOW GFa�CH& AMM 7ES, P.A.
FLE:
G�A'1� 7WB 1/2"=1'-0"
NAGS hE Q NORTH CAROLA A 279M
25,228 MATAN W,, SY,11F2A
2&%- 4iCi FAX252-4*201 MAY 2000
FIGURE 3
DESIGNED: ETW
DRAWN: DCJ
CHECKED: ETW
SHEET: 3 OF 4

1
1
1
1
1
CONSTRUCTION NOTES
AND SPECIFICATIONS
1. LOCATION OF DIRECTIONAL BOREHOLE SHALL BE COORDINATED WITH
AND APPROVED BY THE ENGINER PRIOR TO COMMENCING BORING
OPERATIONS.
2. NO VEHICULAR TRAFFIC OR CONSTRUCTION ACTIVITIES ARE ALLOWED
IN THE WELANDS BETWEEN RIPRAP AND THE EDGE OF WATER.
3. THE CONTRACTOR SHALL RESTORE ALL AREAS DESTURBED BY
CONSTRUCTION ACTIVITIES TO THEIR ORIGINAL CONDITIONS.
4. THE CONTRACTOR SHALL INSTALL A 10' X 10' CONTAINMENT FENCE
AROUND THE BOREHOLE TO HOLD EXCESS DRILLING FLUID AND
SPOILS. THE DRILLING FLUIDS AND SPOIL SHALL BE PUMPED FROM
THE CONTAINMENT STRUCTURE TO THE SHORE, WHERE THE MATERIAL
WILL BE REMOVED AND DISPOSED OF. NO DRILLING FLUIDS OR SPOILS
SHALL BE STORED ON SITE. EXCESS DRILLING FLUID AND SPOILS
SHALL NOT BE DISCHARGED INTO SANITARY OR STORM DRAIN
SYSTEMS, DITCHES OR WATERWAYS.
5. THE PIPE FOR THE DIRECTIONAL BORE SHALL BE HIGH DENSITY
POLYETHYLENE (PE 3408) DR11 IN ACCORDANCE WITH AWWA C906.
FITTINGS SHALL BE BUTT TYPE FITTINGS AND SHALL CONFORM TO
AWWA 906 AND SHALL BE BUTT FUSION WELDED TO THE PIPE IN
ACCORDANCE WITH ASTM D3261.
6. DIFFUSER CHECK VALVES SHALL BE FLOW OPERATED ALLOWING FLOW
IN ONE DIRECTION. THE VALVE SHALL BE OF ALL ONE-PIECE RUBBER
CONSTRUCTION WITH NYLON REINFORCEMENT. THE DIFFUSER CHECK
VALVE SHALL CONNECT TO THE DISCHARGE HEADER BY SLIPING OVER
THE DIFFUSER PORT ATTACHED WITH STAINLESS STEEL CLAMPS. THE
DIFFUSER CHECK VALVES SHALL BE AS MANUFACTURED BY THE RED
VALVE CO. OR APPROVED EQUAL.
7. CONCRETE ANCHORS SHALL BE CAST OFF-SITE AND SHALL HAVE A
MINIMUM COMPRESSIVE STRENGTH OF 3,000 PSI. THE ANCHORS
SHALL BE SHIPPED TO THE FINAL LOCATION AND PLACED IN HAND
EXCAVATED TRENCHES. NO MECHANICAL EXCAVATING EQUIPMENT
SHALL BE USED. �
TYRRELL CO. WATER SYSTEM IMPROVEMENTS
R.O. PLANT CONCENTRATE DISCHARGE
HOM5,, VPChVRCH&AS901C14TE8, P.A.
COMM
25122 S C110ATM W, &MV
252,4000 FAX 22-441-2W
SCALE:
NONE
DATE:
MAY 2000
SEAL
14996
2z1
FIGURE 4
DESIGNED: ETW
DRAWN: DCJ
CHECKED: ETW
SHEET: 4 OF 4