19980795 Ver 1_COMPLETE FILE_19980113

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
A- rkilr2Ai
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
August 24, 1998
Onslow County
DWQ Project 980795
APPROVAL of 401 Water Quality Certification
North Carolina Natural Gas
PO Box 909
Fayetteville NC 28302-0909
Dear Sirs:
You have our approval, in accordance with the attached conditions and those listed below, to impact 3.51
acres of wetlands or waters for the purpose of installing a natural gas line, as you described in your application
dated August 13, 1998. After reviewing your application, we have decided that this impact is covered by
General Water Quality Certification Number 3101. This Certification allows you to use Nationwide Permit
Number 12 when it is issued by the Corps of Engineers. In addition, you should get any other federal, state or
local permits before you go ahead with your project including (but not limited to) Sediment and Erosion
Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. This approval will
expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the General
Certification.
This approval is only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us and you may be required to send us a new
application for a new certification. If the property is sold, the new owner must be given a copy of this
Certification and approval letter and is thereby responsible for complying with all conditions. If total wetland
fills for this project (now or in the future) exceed one acre, compensatory mitigation may be required as
described in 15A NCAC 2H.0506 (h) (6) and (7). For this approval to be valid, you must follow the
conditions listed in the attached certification.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing.
You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written
petition conforming to Chapter 150B of the North Carolina General Statutes to the Office of Administrative
Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and its conditions are final and
binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act. If you have any questions, please telephone John Domey at 919-733-1786.
'nc y,
rest Howard, Jr. P.E.
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Wilmington Field Office
Wilmington DWQ Regional Office
Mr. John Dorney
Central Files
980795.1tr
Division of Water Quality • Non-Discharge Branch
4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • 50% recycled/ 10% post consumer paper
ENVIRONMENTAL SERVICES, INC.
1100 WAKE FOREST ROAD, SUITE 200
RALEIGH, NORTH CAROLINA 27604 i g l?s?sC
[phone] FAX [phone]
II August 1998
Mr. John Dorney
Division of Water Quality
N.C. Department of Environment and Natural Resources
4401 Reedy Creek Road
Raleigh, North Carolina 27607
RE: Camp Lejeune Natural Gas System
Dear John:
1)80795
Enclosed are seven (7) copies of a completed Pre-construction Notification Application for a
Nationwide Permit #12 being requested for the proposed natural gas system on Camp Lejeune in
Onslow County. The original and a copy of this application have been submitted to the U.S. Army
Corps of Engineers. The erosion control plan for this project has been submitted to the N.C.
Division of Land Quality for review.
Please call me or Kevin Markham here at Environmental Services, Inc., if you have any questions.
Sincerely,
ENVIRONMENTAL SE VICES, INC.
C
Dicky Harmo , PWS
Assistant Vice President

DEM ID:
CORPS ACTION ID:
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #): 12
P-RE-CONSTRUCTION NOTIFICATION APPLICATION
Qt DE PERMITS THAT REQUIRE:
41993 NOTIFICATION TO THE CORPS OF ENGINEERS
2) APPLICATION FOR SECTION 401 CERTIFICATION
?'WkTI?N? t.kF'±!'.COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
'
W?+T?R U ,, ll'
.... _._
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE
FIELD OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN
(7) COPIES SHOULD BE SENT TO THE N.C. DIVISION OF ENVIRONMENTAL MANAGEMENT
(SEE AGENCY ADDRESSES SHEET). PLEASE PRINT.
1. OWNERS NAME: North Carolina Natural Gas (Easement)
2. MAILING ADDRESS: P.O. Box 909
SUBDIVISION NAME: Not applicable (N/A)_
CITY: Fayetteville STATE: NC ZIP CODE: 28302-0909
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE): U.S. Marine Corps Base. Camp Lejeune
3. TELEPHONE NUMBER (HOME): N/A (WORK): N/A
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER: Edward Hampson
P.O Box 909
Fayetteville NC 28302-0909
[phone]
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC
MAP OR AERIAL PHOTOGRAPHY WITH SCALE):
COUNTY: Onslow NEAREST TOWN OR CITY: Camp Lejeune (Jacksonville)
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ETC.):
The Section A transmission line enters the Base (Camp Geiger Area) across US 17
Bypass, extends south down the west shoulder of Church Street, and turns east and
runs along the south side of Sixth Street. The transmission corridor then turns
south and runs briefly down the west side of G Street, then runs east adjacent to a
line of utility poles and a Base wastewater line corridor. The transmission line then
runs east, adjacent to the wastewater line corridor, across the New River at Jacks
Point. Section A includes a short length of transmission line to building #G650 in
the vicinity of the intersection of Sixth and G Streets; a distribution line extends to
the southwest adjacent to a wastewater line and a railroad corridor to building
#AS4151 in the vicinity of the Marine Corps Air Station.
The Section B transmission line of the Preferred Route continues east from Jacks
Point adjacent to a utility pole corridor to Knox Road, near the Knox Road
intersection with NC 24 (Lejeune Blvd). From Knox Road, the transmission line
continues southeast adjacent to the CP&L corridor and railroad tracks across
Northeast Creek. On the east side of Northeast Creek, the transmission line remains
adjacent to the south side of the railroad ROW and extends southward to meet with
the northern terminus of Section C south of Brewster Blvd in the vicintiy of
Brewster Junior High School. Section B includes distribution lines along Montford
Landing Road and Harlem Drive to buildings #M625 and #M230. This section also
includes a distribution line running west paralleling Brewster Blvd and adjacent to an
existing utility corridor to building #NH 100 (Naval Hospital); the line continues along
Brewster Blvd, Charles Street, and Seth Williams Blvd to building #PP2615 (the
Officers Club).
The Section C transmission line extends south adjacent to the CP&L corridor and
wastewater line, across Wallace Creek, Bearhead Creek and Parachute Tower Road
to Holcomb Blvd. The transmission line runs to the southwest along the south side
of Holcomb Blvd to Gum Street, where the pipeline turns southeast and extends to
building #HP1700.
6. IMPACTED OR NEAREST STREAM/RIVER: New River, Northeast Creek, and tributaries
RIVER BASIN: White Oak River Basin
7a. IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER (SA),
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-II)? YES [ X ] NO [ ] IF YES, EXPLAIN: Project will
emoloyee directional boring at crossings of tidal salt waters (New River Edwards Creek Wilson Bav
Northeast Creek and Scales Creek u ing directional drilling methods such that the pipeline is buried in
an inverted arc beneath the water crossing at depths of up to 40 feet
7b. IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES [ X ] NO [ ]
Note: all public trust waters and estuarine wetland crossings will be directionally bored (see 7a).
7c. IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION?
Develoned/Militarv Reservation
8a. HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PROPERTY? YES [ ] NO [ X ] IF YES, PROVIDE ACTION I.D. NUMBER OF
PREVIOUS PERMIT AND ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401
CERTIFICATION):
8b. ARE ANY ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN
FUTURE? YES [ ] NO [ X ] IF YES, DESCRIBE ANTICIPATED WORK:
2
9a. ESTIMATED TOTAL NUMBER OF ACRES IN TRACT OF LAND: 65.3 ac
9b. ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
12.8 ac
I Oa. NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING:
FLOODING:
DRAINAGE:
EXCAVATION:
OTHER: Clearin /tem orary trenching for 3.51 ac
TOTAL ACRES TO BE IMPACTED: 3.51 ac
l Ob. (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF
RELOCATED, PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION):
LENGTH BEFORE: 103 FT AFTER: N/A FT
WIDTH BEFORE (based on normal high water contours): See accompanying table FT
WIDTH AFTER: Same as pre-disturbance widths FT
AVERAGE DEPTH BEFORE: Variable. mostly less than 2 FT AFTER: Same as pre-disturbance FT
(2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: PLACEMENT OF PIPE IN CHANNEL:
CHANNEL EXCAVATION: CONSTRUCTION OF A DAM/FLOODING:
OTHER: Temporary trenching: crossings will be restored to original contours
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TOP THE POND? N/A
WHAT IS THE EXPECTED POND SURFACE AREA? N/A
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF
MECHANICAL EQUIPMENT TO BE USED (ATTACH PLANS: 8 1/2" X 11" DRAWINGS ONLY):
Construction on Base of a natural gas transmission pipeline and distribution mains for delivery to
seven existing steam plants. Route includes approximately 12.1 miles of transmission line and
approximately 5.8 miles of distribution line. Transmission pipeline will be within a 40-ft wide
right-of-way (ROW) corridor; distribution lines will be within a 10-ft ROW. See attachment
describing design, construction, operations, and maintenance of natural gas facilities.
13. PURPOSE OF PROPOSED WORK: To provide Base with natural gas which is a more economical
and cleaner-burning alternative to coal and fuel oil at Base steam plants
3
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT
IN WETLANDS. (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND IMPACTS):
The extensive nature of wetlands and presence of streams crossing alternative alignments
prevented total avoidance of wetland crossings. The preferred alignment proposed for
construction will result in less impact to jurisdictional areas than other alternative evaluated.
Directional drilling will be conducted at eight (8) locations (as agreed during 18 April 1997 on-
site visit with Corps and N.C. Division of Coastal Management personnel) to avoid disturbance
to estuarine waters and wetlands, and to major stream crossings and associated wetland forests, t/
resulting in avoidance of impacts to 7.33 ac of wetlands and 1.92 ac of waters (representing
2,093 feet of water crossings).
15. YOU ARE REQUIRED TO CONTACT THE U.S. FISH AND WILDLIFE SERVICE (USFWS)
AND/OR NATIONAL MARINE FISHERIES SERVICE (NMFS) (SEE AGENCY ADDRESSES
SHEET) REGARDING THE PRESENCE OF ANY FEDERALLY LISTED OR PROPOSED FOR
LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL HABITAT IN THE PERMIT
AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED:
(ATTACH RESPONSES FROM THESE AGENCIES.)
NOTE: CORPS NOW INDICATES THIS RESPONSE NOT REQUIRED.
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) (SEE AGENCY ADDRESSES SHEET) REGARDING THE PRESENCE OF HISTORIC
PROPERTIES IN THE PERMIT AREA WHICH MAY BE AFFECTED BY THE PROPOSED
PROJECT. DATE CONTACTED:
NOTE: CORPS NOW INDICATES THIS RESPONSE NOT REQUIRED.
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OR THE USE OF
PUBLIC (STATE) LAND?
YES [ X ] NO [ ] (IF NO, GO TO 18)
a. IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT?
YES [ X ] NO [ ]
b. IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE?
YES [ X ] NO [ ]
IF ANSWER TO 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE
STATE CLEARINGHOUSE TO DIVISION OF ENVIRONMENTAL MANAGEMENT REGARDING
COMPLIANCE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
4
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF
PROPOSED ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OR FILL MATERIAL
INTO WETLANDS:
a. WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STEAMS, LAKES AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38).
ALL STREAMS (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN
ON THE MAP. MAP SCALES SHOULD BE I INCH EQUALS 50 FEET OR 1 INCH EQUALS 100
FT OR THEIR EQUIVALENT.
b. IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE
IMPACTED BY PROJECT.
c. IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA
SHEETS RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
d. ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
e. WHAT IS THE LAND USE OF SURROUNDING PROPERTY? The property surrounding
the project area is dedicated entirely for the use of Marine Corps facilities The project vicinity is
primarily forested with concentrated residential and military development located throughout the area
Right-of-way locations are positioned alone existing roadways and utility corridors whenever possible
IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A
g. SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE U.S. MAY NOT BE IMPACTED PRIOR TO:
1) ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2) EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF
ENVIRONMENTAL MANAGEMENT (WATER QUALITY) CERTIFICATION, AND,
3) (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH
CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM.
OWNER'S/AGENT'S SIGNATURE
DATE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED (18g.))
5
Proposed Natural Gas System on Camp Lejeune wetland and stream crossings. Area #
refers to locations depicted on accompanying USGS maps. There are approximately 28
crossings in this project. Reference stations are approximate. An asterisk (*) indicates the
area is being directionally drilled to avoid impacts.
AREA # PIPE LINE REFERENCE
STATION DESCRIPTION DISTURBED
ACREAGE
1* 110 87 + 13 - 1 12 + 94 wetland/stream 0
2* 110 1 16 + 26 - 130+18 wetland/stream 0
3 * 110 139 + 47 - 154-415 wetland/stream 0
4 110 154 + 15 - 159+97 wetland 0.534
5 110 167 + 92 - 167+97 stream 0.005
6 110 176 + 77 - 183+27 wetland 0.597
7 110 202 + 32 - 203 +02 wetland 0.064
8 110 212 + 70 - 215 + 30 wetland 0.239
9* 110 237 + 81 - 239 + 81 wetland/stream 0
10 110 312 + 36 - 313 + 86 wetland 0.138
11 110 317 +40 - 319 + 90 wetland 0.230
12* 110 356 + 00 - 372 + 95,
373 + 70 - 374+ 50 wetland/stream 0
13 * 110 392 + 54 - 394 + 04 wetland/stream 0
14 110 437 + 63 - 437 + 68 stream 0.005
15 110 441 +47 - 451 + 97 wetland 0.964
16 110 460 + 28 - 460 + 33 stream 0.005
17A 110 488 + 50 - 489 +00 wetland 0.046
17* 110 506 + 40 - 511 + 90,
516+90 - 527+90 wetland/stream 0
18A 110 560 + 27 - 564 + 03 wetland 0.345
18* 110 564 + 03 - 572 + 67 wetland/stream 0
19 110 588 + 50 - 588 + 65 stream 0.014
20 110 596 +40 - 596 + 90,
599+40 - 600+40 wetland 0.138
21 AS-4151 41 + 98 - 49 + 68 wetland 0.177
22 Hospital Lateral 15 +40 - 15 + 55 wetland 0.003
23 Hospital Lateral 19 + 29 - 20 + 79 wetland 0.034
24A Hospital Lateral 34 + 78 - 34 + 98 stream 0.005
24B Officers Club Lat 6+92-7+12 stream 0.005
25 Officers Club Lat 21 + 27 - 21 + 37 stream 0.002
26 Officers Club Lat 28 + 60 - 29 + 00 wetland 0.009
27 Officers Club Lat 37+00 - 37+03 stream 0.001
28 Officers Club Lat 76 + 73 - 76 + 78 stream 0.001
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Attachment
Design, Construction, Operations, and Maintenance of Natural Gas Facilities
Proposed Natural Gas System on Camp Lejeune
Onslow County, North Carolina
DESIGN AND CONSTRUCTION OF NATURAL GAS FACILITIES
General
There are three types of natural gas facilities proposed to be constructed on Base: transmission
pipeline, distribution main including service lines, and various stations. These facilities are to
be designed and constructed in accordance with the US Department of Transportation
regulations 49 CFR Part 192 (or Part 192). The North Carolina Utilities Commission (NCUC)
is responsible to enforce these regulations in the State of North Carolina.
Transmission Pipeline
Pipeline Materials
The transmission pipeline (or pipeline) would be primarily a welded assembly composed of steel
pipe having an outside diameter of 8 and 5/8 inches and manufactured in accordance with API
5L code specification for grade X-52 pipe (specified minimum yield strength of 52,000 psi).
In addition, various steel fittings and valves would be installed for proper design and operation
of the pipeline.
Operating Pressure
The pipeline would be designed and constructed to operate at pressures up to 1,000 psi,
although initially the normal operating pressure range would be between 200 and 600 psi.
Ground Cover
The pipeline would be installed underground and have a minimum ground cover of 36 inches
(24 inches in consolidated rock), except for crossings under navigable waters where the
minimum cover would be 48 inches (24 inches in consolidated rock).
Right Of Way
The transmission pipeline would be constructed, operated and maintained within a 40 ft wide
right of way (ROW) corridor granted by the Department of the Navy. The intent of granting
NCNG a dedicated easement would be to minimize and control encroachment with other
utilities and non-NCNG facilities. This would help minimize damage to all facilities resulting
from excavating activities and to allow adequate access for facility operation and maintenance.
Construction Overview
Construction of a natural gas transmission pipeline can be broken down into the following
activities: route selection, surveying, right of way clearing, pipeline welding, boring, ditch
excavation, pipeline installation, pressure testing and right of way restoration. These activities
are discussed below. Due to the construction process, noise levels in the vicinity of the
pipeline construction would be higher than normal. These impacts would be temporary and not
present a significant adverse impact.
Route Selection
The criteria used in route selection is discussed in subsection B (Purpose and Need) of section
II (Project Description) of the EA. In summary, public safety, proximity to the gas service
points, minimizing environmental impact and cost all play a part in route selection. Generally,
the transmission pipeline alternate routes were selected to run as much as possible within or
adjacent to existing utility corridors.
Surveying and Clearing
Once the final route is selected, survey crews stake the boundaries of the ROW prior to
commencing cleaning operations. Prior to clearing, base forestry personnel would be consulted
so that marketable timber may be harvested. All non-marketable trees within the ROW
boundary are cut to the stump and burned or otherwise disposed of. After the trees are
removed, the ROW is "grubbed" to remove stumps and large roots. These activities would be
conducted in accordance with Base regulations. Areas along the route which are directionally
drilled (to be discussed below) would not be cleared.
Welding
After the ROW has been cleared, the pipe is laid out along the route in sections prior to
welding. This is commonly referred to as "stringing the pipe". Once the stringing has
progressed sufficiently so as not to impede the progress of the welding crew, the joining of
the pipe begins. The sections of pipe are joined by a submerged arc; welding process. When
a weld is completed, it is inspected and x-rayed. The welding is conducted in accordance with
Part 192, API 1 104 code, and NCNG welding procedures. The welding and x-ray operations
are conducted in accordance with Federal and State regulations (i.e. OSHA, Part 192) which
include procedures to protect operating personnel and the public.
Construction Sequence
Once the welding crew passes the first bored crossing (either conventional or directional), a
crew is brought in to trench, install the pipeline, and tie-in to the bored crossings.
Conventional Boring
The crossing of roads, streams, rivers or other obstacles is generally accomplished by one of
two boring methods - conventional or directional. A conventionally-bored crossing is
accomplished by augering a hole under a roadway or other obstacle through pipe equal in size
to the pipeline. The bore pipe, as it is commonly known, is then welded to the "carrier pipe"
or pipeline, and the permanent pipe is pulled into the bored hole. The permanent pipe is then
capped and covered until it is connected to the remainder of the pipeline. Conventional bores
are commonly used for crossings one hundred feet or less in length.
Directional Drill Method Of Boring
Longer bores or bores in environmentally sensitive areas are normally accomplished by using
the directional drill method. On Base, all known archaeological areas of significance, public
trust waters, estuarine wetlands, and other wetlands as required by the US Army Corps of
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Engineers and the Division of Coastal Management would be directionally drilled. The striking
feature of directionally drilled crossings is the burial of the pipeline in an inverted arc beneath
the water crossing or surface feature to be avoided at depths of up to 40 ft. This process is
considerably more involved than conventional boring, including more drilling equipment and a
larger equipment staging area. A computerized guidance system is used to maintain the correct
course for the drilling process. Even on crossings greater than one-half mile, the drill often
exits within inches of the planned exit point. The directional drill method also utilizes a
bentonite clay/water mixture which is pumped into the drill hole to lubricate the drill bit and
to draw off the soil to be removed during the drilling process. Any bentonite mixture at the
ground surface would be hauled off Base by a licensed hauler to a proper disposal area; if not
considered hazardous, the mixture can be spread in place if no significant change in elevation
or impact to wetlands results. During the directional drilling process, road shoulders or other
rights of way adjacent to the pipeline right of way may be utilized for temporary storage or
placement of various drilling equipment. The majority of the areas requiring directional drilling
are located in remote areas where traffic is very low. Coordination of this temporary storage
of equipment would be coordinated with the Base to ensure minimal impact to Base traffic.
Excavation and Pipeline Installation
The ditching crew is responsible for digging the pipeline trench, inspecting the coating on the
pipeline, coating each weld area, lowering the pipeline into the ditch, tying into bored crossings
and backfilling the ditch. The trench for the pipeline is dug to a depth of 48 inches to 56
inches. This is to maintain a minimum cover over the top of the pipeline of 36 inches. While
digging the trench, the top 8 inches to 12 inches of topsoil is segregated from the lower layers
of soil. The trench will not be centered in the ROW, but be spaced 15 ft from one boundary
and 25 ft from the other. This spacing is to allow for the possibility of an additional pipeline
in the future. The spoil (excavated soil from the ditch) is placed between the trench and the
ROW boundary. Once the trench is dug, the pipeline is lifted, checked for holidays (or holes)
in the coating and then lowered into the trench. After the section has been lowered into the
trench, the trench and pipeline are backfilled. When backfilling, the soil which was excavated
from the bottom of the ditch is deposited in the trench first and then the topsoil replaced on
top of the trench. Once the trench has been backfilled, the area is cleaned up and reseeded
in accordance with the NCNG's approved erosion and sedimentation control plan.
Pipeline Coating and Cathodic projection
As discussed in the previous section, the steel pipeline is coated with a suitable coating, which
is usually a thin jacket of factory-applied epoxy based material or two-part cold applied tape
system. Coatings are used on steel pipelines to help protect them from corrosion. Combined
with the use of a sacrificial anode system, usually a rectifier and ground anode bed system for
transmission pipelines, the pipeline may go indefinitely without corrosion. This would most
likely not be the case for a bare steel pipeline. A low-level DC voltage is imposed onto the
pipeline through the ground via the rectifier and anode bed system protecting the pipeline at
locations where the coating has holidays.
Pressure Testing
Once the entire pipeline has been installed, the line is filled with water (about 200,000 gallons
are required) and pressure tested (hydrostatic testing). The pressure on the line is initially
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raised to approximately 300 psi and held for three to six hours in order for the temperature of
the test water to reach equilibrium with the temperature of the ground. After this initial test
period, the pressure is then raised to approximately 1600 psi and held for 24 hours to ensure
that the line is leak free. After completing an acceptable test, the pipeline is de-watered and
drying operations begin. The pipeline is dried by inserting foam plugs (known as pigs) into the
line and pushing them the entire length of the pipeline with compressed air. These pigs can be
run singularly or in strings of 5 to 10 at a time. The source of the water to be used for the
pressure test and the discharge of this water after the test would be in accordance with Base
specifications and local and State regulations. No chemical additives would be added to the
water during this procedure. Once the pipeline is dried sufficiently, the line is tied-in to the
supply line and natural gas is allowed to flow into the new pipeline to displace the air in the
line. This process is known as "purging" the pipeline. During the purging process, a valve at
the end of the pipeline is left completely open to allow air to escape from the pipeline while
being displaced with natural gas. A roaring sound can be heard from the open valve while the
air is allowed to escape. Prior to the purge, all local emergency response personnel are notified
in the event someone from the general public reports the sound. The purging would be
conducted in an industrial area during normal business hours. The levels of noise would be
reduced to meet OSHA standards for those conducting work at the site. Once all of the air is
displaced from the pipeline and 100 percent of natural gas is registered using a Combustible
Gas Indicator, the pipeline is pressured up to a pressure equal to that in the supply line.
Distribution Main and Service Lines
Although very similar in some respects, the installation of a distribution pipeline (referred to
as "main" for the portion that delivers gas to more than one delivery point and as "service line"
for the portion of the main going to only one service point) varies somewhat from the
installation of a transmission pipeline. The primary difference is the type of material the pipe
is manufactured from. The mains on Base would be operated at or below 60 psi and would
be made of a polyethylene resin material. The joining of this type of pipe is accomplished by
heat fusion. This involves heating each end of the pipe to establish a melt pattern and then
pushing the pipe ends together making a fusion joint. The pipe is then installed in much the
same manner as a transmission pipeline. A locating tracer wire is installed with the
polyethylene pipe to allow for locating the main in the future. The distribution lines would be
underground and have a minimum ground cover of 24 inches (36 inches where possible),
except for crossings under navigable waters where the minimum cover would be 48 inches (24
inches in consolidated rock). Generally, the amount of equipment required to install distribution
pipe is much less than that required to install transmission lines. Because of this, the lower
operating pressures, lower installation costs and less chance of requiring another parallel line,
the ROW for the distribution lines on Base would be only 10 ft in width. The pressure test for
distribution mains would be accomplished by pressuring the mains to about 90 psi with air and
held at that pressure for about 8 hours.
Stations
General
Several above ground stations would be required to be installed on Base.
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Meter and Regulator Stations
A meter and regulator station would be needed to measure the gas volumes to each gas
service point. In addition, these stations would contain regulation to reduce the supply line
pressure to the pressure needed for the steam plant equipment to operate properly.
Overpressure protection equipment would also be installed in accordance with Part 192 to
protect the service point in the rare event of a regulation failure. These stations would also
contain various valves, pipe fittings and required equipment, and are primarily welded together.
The stations would be installed within standard fenced enclosures (no larger than 50 ft by 50
ft). All piping would be painted to control atmospheric corrosion. The stations would all be
located near other utility facilities serving these steam plants, and as such would blend in with
their surroundings.
Regulator Stations
Regulator stations would be installed at the junction of the transmission pipeline and each
distribution main. The primary function of the station would be to reduce transmission pressure
to distribution pressure. These stations would be similar in construction to the meter and
regulator stations described above. In addition, a city gate station would be installed on Base
near the intersection of Highway 24 and Western Boulevard (for the Preferred Route and
Highway 24 and Knox Road for the Secondary Route) to serve as the primary meter and
regulator station to serve the city of Jacksonville. This station would occupy a 50 ft by 50 ft
ROW across existing railway tracks adjacent to the transmission line ROW.
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OPERATIONS AND MAINTENANCE OF NATURAL GAS FACILITIES
General
The natural gas facilities would be operated and maintained in accordance with Part 192.
Various surveys would be required to be performed on a periodic basis to ensure the integrity
and proper operation of these facilities. In addition, the NCUC would perform periodic audits
of the facilities and the necessary operations and maintenance records to ensure that Part 192
and the related NCUC regulations are adhered to. Procedures addressing damage prevention,
facility marking, emergency training and response are also discussed below as part of the
effort to minimize impact to life and property.
Natural Gas
Natural gas is an odorless colorless gaseous hydrocarbon. It is comprised primarily of methane
and is generally accepted as a clean burning fuel. The typical specific gravity is 0.6 and as
such is lighter than air (air has a specific gravity of 1.0). It is flammable when mixed in air and
burned in the appropriate flammability range, typically 4 to 14 percent natural gas in air. It is
also potentially explosive when allowed to accumulate and then ignited within the flammability
range. NCNG's natural gas suppliers add a hydrocarbon, a mercaptan, to the natural gas at the
delivery points to NCNG's system in order to give natural gas its characteristic odor for safety
in accordance with Part 192 regulations.
Transmission Pipeline
Leak Survey
A leak survey would be required to be conducted annually over the pipeline, except in
directionally drilled areas. This consists of physically walking the route of the pipeline with a
Flame Ionization unit or FI unit. The FI unit draws a sample of the air into a chamber and
analyzes for the presence of natural gas. The A unit is capable of detecting amounts of natural
gas down to 10 ppm (parts per million). If natural gas is detected by the FI unit, a Combustible
Gas Indicator is then used to determine the percentage level of gas in air. After taking
readings, if a gas leak is suspected, a crew is dispatched to excavate the pipeline and
determine if a leak actually exists. If a leak is found, either a leak repair clamp is placed over
the leaking area and then welded to the pipeline, or the section of the pipe that is leaking is
replaced. Repair clamps may normally be installed without an interruption of service.
Pa trolling
The pipeline would also be patrolled at least quarterly by walking, driving or flying to observe
surface conditions on or adjacent to the ROW for indications of leaks, washouts, construction
activity and other factors affecting safety and operations.
Valve Maintenance
All critical valves on the pipeline would be inspected and operated annually. The inspection
consists of greasing the valve, verifying the valve identification number, painting if necessary
and reporting any other maintenance action which may be necessary.
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Cathodic Protection
A cathodic protection survey would be conducted annually to test the pipeline for signs of
potential corrosion activity. Remediation measures would be implemented accordingly.
ROW Maintenance
Except in areas which are directionally drilled, the pipeline right of way would be mowed
annually. This serves several purposes. The mowing keeps the ROW easily identifiable, it
allows the crew to find any condition which may be detrimental to the integrity of the pipeline
and also allows the crew to find any condition which may be evidence of a leak on the
pipeline.
ROW Access
Access to the pipeline ROW would be gained from existing roads and gravel paths. No road
would be built or maintained on the ROW, although the ROW would be routinely traveled for
operations and maintenance activities.
Damage Prevention Program
The leading cause of pipeline leaks are dig-ins, which is a situation in which a third party
excavating for any reason strikes the pipeline while digging. The more developed the area, the
greater the potential for dig-ins. Also NCNG, as well as other gas companies, do not allow the
construction of buildings on its ROWs. This is to prevent interference with various
maintenance activities and also prevents the possibility of the building foundation or any
service (water lines, electric lines, etc.) from affecting the integrity of the pipeline. Also, to
minimize the possibility of a dig-in, the pipeline is marked along its entire length, including at
road and railroad crossings and at above ground piping locations, by placing fiberglass signs
which identify the presence of a natural gas pipeline and which provide a telephone number
to call for more information or to report any potentially harmful condition. NCNG is also a
member of the North Carolina One Call system. North Carolina One Call is an agency which
notifies member utilities of excavation activities in the area of the utility's facilities. North
Carolina state law requires any excavating party to notify the North Carolina One Call Center
48 hours prior to engaging in any excavating activities. The One Call Center then notifies
member utilities in the area of the excavating activities. Once the member utility is notified,
a representative is dispatched to the area to flag the utility in the area of the excavation. The
North Carolina One Call Center publishes its toll free telephone number in the front part of local
phone directories.
Emergency Training and Response
Part 192 requires natural gas operators to develop and maintain emergency response plans to
address natural gas related emergencies and also to train appropriate operations personnel and
other emergency response agencies how to recognize and respond effectively to a natural gas
incident. NCNG holds annual meetings with local fire, police and other public officials to
maintain a well coordinated emergency response effort. Such efforts would also be
coordinated with the appropriate Base personnel on an annual basis. Emergency response
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includes isolation of the affected area as soon as possible in order to protect human life and
then securing natural gas facilities, including elimination of any leaking natural gas, to protect
human life and property.
Public Education Program
Part 192 requires natural gas operators to have a public education program, the purpose of
which is to educate the public to recognize natural gas pipeline emergencies and how to report
them to the operator. NCNG accomplishes this through annual postings of related information
in local newspapers.
Distribution Main and Service Lines
Leak surveys are required to be performed over distribution mains every 5 years. The
distribution systems on Base would be patrolled at least annually and any critical valves
maintained annually.
Stations
All stations would be inspected at least annually to ensure the equipment is operating properly.
The set points of the regulators are verified as are the set points of relief valves. During normal
operations there would be no noise associated with the operation of the transmission pipelines
and distribution mains that are underground. A hissing sound may be heard when in close
proximity to the aboveground stations. The noise would be well below OSHA levels. These
stations would be situated either in industrial areas or areas remote from residences. During
maintenance activities natural gas may be vented to the atmosphere for a short period of time.
This venting would be conducted in accordance with all applicable Federal, State, and Base
regulations. There would be an increase in noise level during the venting process, but generally
only in the immediate vicinity of the venting. These ventings would meet OSHA noise
regulations for those conducting work at the stations and would usually be conducted during
normal business hours.
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