Construction began in September on a natural gas pipeline designed to fuel a new electric power generating facility in Cecil County, Md., by August 2016.

Williams is providing this newsletter to parties who may be affected or have an interest in the project.

The Rock Springs pipeline project involves the construction of an 11.2-mile pipeline lateral connecting Williams’ existing Transco natural gas pipeline to the Old Dominion Electric Cooperative’s Wildcat Point Generating Facility. The Wildcat Point facility is planned to generate approximately 1,000 megawatts, enough to power 390,000 homes in the region.

The 11.2 miles of new 20-inch diameter steel pipe is connecting the existing Transco pipeline in Lancaster County, Pa., with the Wildcat Point facility, approximately five miles from the Town of Rising Sun in Cecil County, Md. The pipeline project, which will transport

approximately 192,000 dekatherms of natural gas per day, was approved by the Federal Energy Regulatory Commission in March 2015.

As part of the Rock Springs project, Williams is constructing a 4,000-horsepower, electric motor-driven compressor and metering facility at the terminus of the lateral in Cecil County. Construction of the facility got underway in June 2015 and is expected to be complete by April 2016.

Pipeline construction is expected to be complete by January 2016, with right-of-way restoration work and cleanup lasting through March 2016. Crews will be installing the pipe beginning in Maryland and working northwest toward the existing Transco pipeline in southern Lancaster County, Pa.

Pipeline construction looks much like a moving assembly line with various crews working their way through a given area.

As one crew completes its work, the next crew moves into position to complete its piece of the construction process. The bulk of construction work in each area lasts approximately six to eight weeks.

Once construction is complete, Williams land agents will follow up with directly affected landowners to assess any particular issues or concerns that the landowner may have, such as impact to landscaping or fences. Land disturbed during the construction period will be returned to as close to original condition as possible. Agricultural lands will be properly restored using approved, modern mitigation techniques designed to ensure full productive reuse of the agricultural lands.

Questions related to pipeline construction can be directed to Williams Rock Springs project land office at (717) 208-6019. The office is staffed during normal business hours.

Williams Begins Pipeline Construction on Rock Springs Expansion

Fall 2015

www.williams.com/rocksprings

Rock Springs Expansion Project

Williams pipe yard in Cecil County, Maryland.

2

1. Pre-construction surveyBefore construction begins, crews survey environmental features along proposed pipeline segments. Utility lines and agricultural drainages are located and marked to prevent accidental damage during pipeline construction.

2. Clearing and gradingThe pipeline right of way is cleared of vegetation. Temporary erosion control measures are installed.

3. TrenchingTopsoil is removed from the work area and stockpiled separately in agricultural areas. Crews use backhoes or trenching machines to excavate a pipeline trench. The soil that is excavated during ditching operations is temporarily stockpiled.

4. Pipe stringing Individual joints of pipe are strung along the right of way adjacent to the excavated ditch. A mechanical pipe-bending machine bends individual joints of pipe to the desired angle at locations where there are significant changes in the natural ground contours.

5. Welding & pipe coating After the stringing and bending are complete, the pipe sections are aligned, welded together, and placed on temporary supports along the edge of the trench. All welds are then inspected. Line pipe,

normally mill-coated or yard-coated prior to stringing, requires a coating at the welded joints.

6. Lowering pipe in and backfillingThe pipe assembly is lowered into the trench by side-boom tractors. The trench is backfilled using a backfilling or bladed equipment; no foreign materials are permitted in the trench.

7. TestingAfter backfilling, the pipeline is hydrostatically tested following federal regulations. Test water is obtained and disposed of in accordance with applicable federal, state and local regulations.

8. RestorationOur policy is to clean up and restore the work area as soon as possible. After the pipeline is backfilled and tested, disturbed areas are restored as close as possible to their original contours. Restoration measures are maintained until the area is restored, as closely as possible, to its original condition.

8 Stages of Pipeline Construction

To minimize impacts associated with crop

productivity, topsoil segregation is used in

all agricultural lands. If the topsoil is not

fully removed prior to construction, it may

be permanently damaged by the pipeline

work, due to rutting, compaction, and the

inversion and mixing of the soil layers. To

avoid this, the topsoil is stripped and stored

safely. It must be segregated and stockpiled

away from the pipeline trench, the excavated

spoil, the pipe assembly area and the traffic

zone. The full thickness of the topsoil zone

is typically twelve inches. The subsoil, which

receives the bulk of the construction traffic,

is tested and decompacted, if required,

using agricultural rippers. In our experience,

soils within the right-of-way don’t typically

exhibit water movement problems when

proper topsoil segregation and decompaction

techniques are used. Prior to topsoil

segregation, the topsoil depth will be

measured and recorded to minimize mixing

topsoil with subsoil.

Topsoil Preservation

How Williams Builds PipelinesHow Williams Builds Pipelines

1 2 3 4

5 6 7 8

1. Pre-construction surveyBefore construction begins, Williams surveys environmental features along proposed pipeline segments. Utility lines and agricultural drainages are located and marked to prevent accidental damage during pipeline construction. The pipeline’s centerline and the exterior right of way and workspace is staked.

2. Clearing and gradingThe pipeline right of way is cleared of vegeta-tion. Temporary erosion control measures are installed prior to any earth-moving activities.

3. TrenchingTopsoil is removed from the work area and stockpiled in agricultural areas. Williams then uses backhoes and trenching machines to excavate the trench. The soil that is excavated during ditching operations is temporarily stockpiled on the right of way.

4. Pipe stringing and bendingIndividual joints of pipe are strung along the right of way adjacent to the excavated ditch and arranged so they are accessible to construction personnel. A mechanical pipe-bending machine bends individual joints of pipe to the desired angle at locations where there are significant changes in the natural ground contours or where the pipeline route changes direction.

5. Welding, pipe coating and x-ray inspectionAfter the stringing and bending are complete, the pipe sections are aligned, welded together, and placed on temporary supports along the edge of the trench. All welds are then x-rayed. Line pipe requires a coating at the welded joints. The entire pipe coating is then electronically inspected.

6. Lowering pipe in and backfillingThe pipe assembly is lowered into the trench by sideboom tractors. The trench is backfilled. No foreign materials are allowed in the trench.

7. TestingAfter backfilling, the pipe is filled with water and pressure tested. Tested water is obtained and disposed of in accordance with applicable regulations.

8. RestorationWilliams’ policy is to clean up and restore the work area as soon as possible. Disturbed areas are restored, as nearly as possible, to their original contours. Temporary environmental control measures are maintained until the area is restored, as closely as possible, to its original condition.

© 2010 The Williams Companies, Inc.

How Williams Builds PipelinesHow Williams Builds Pipelines

1 2 3 4

5 6 7 8

1. Pre-construction surveyBefore construction begins, Williams surveys environmental features along proposed pipeline segments. Utility lines and agricultural drainages are located and marked to prevent accidental damage during pipeline construction. The pipeline’s centerline and the exterior right of way and workspace is staked.

2. Clearing and gradingThe pipeline right of way is cleared of vegeta-tion. Temporary erosion control measures are installed prior to any earth-moving activities.

3. TrenchingTopsoil is removed from the work area and stockpiled in agricultural areas. Williams then uses backhoes and trenching machines to excavate the trench. The soil that is excavated during ditching operations is temporarily stockpiled on the right of way.

4. Pipe stringing and bendingIndividual joints of pipe are strung along the right of way adjacent to the excavated ditch and arranged so they are accessible to construction personnel. A mechanical pipe-bending machine bends individual joints of pipe to the desired angle at locations where there are significant changes in the natural ground contours or where the pipeline route changes direction.

5. Welding, pipe coating and x-ray inspectionAfter the stringing and bending are complete, the pipe sections are aligned, welded together, and placed on temporary supports along the edge of the trench. All welds are then x-rayed. Line pipe requires a coating at the welded joints. The entire pipe coating is then electronically inspected.

6. Lowering pipe in and backfillingThe pipe assembly is lowered into the trench by sideboom tractors. The trench is backfilled. No foreign materials are allowed in the trench.

7. TestingAfter backfilling, the pipe is filled with water and pressure tested. Tested water is obtained and disposed of in accordance with applicable regulations.

8. RestorationWilliams’ policy is to clean up and restore the work area as soon as possible. Disturbed areas are restored, as nearly as possible, to their original contours. Temporary environmental control measures are maintained until the area is restored, as closely as possible, to its original condition.

© 2010 The Williams Companies, Inc.

3

Rock Springs Expansion: Frequently Asked QuestionsHow long will pipe construction last?In any one area, the bulk of the work will be done in six to eight weeks. We began pipeline work in September and plan to finish restoration work by March 2016.

What are construction work hours?Standard construction operating hours are 7 a.m. to 7 p.m., Monday through Saturday, but may vary due to local ordinances.

How will you construct around septic systems?If the pipeline’s new proposed right-of-way impacts an existing septic system, then the company will take responsibility for having it repaired, or replaced/relocated off right-of-way, with the landowner’s permission (assuming that there is room).

How will dust be controlled?The contractor will use water trucks to minimize dust issues from the construction travel lane during construction activities.

What will the company do to protect water wells? Williams land agents solicit input from each affected landowner about the number and location of water wells that are present on their property. Prior to construction, Williams seeks landowner permission to test all wells within 150-feet of the construction footprint before and after construction. Any problems with tested water wells after construction begins will be promptly resolved by the company.

Is construction vibration something that is monitored?Williams offers vibration monitoring for home structures for interested landowners. This would consist of both pre-construction and post-construction structural analysis of foundations and structures by a professional structural engineering firm.

What is the status of the Wildcat Point Generation Facility?Wildcat Point was approved in May 2014 when Old Dominion Electric Cooperative (ODEC) received a Certificate of Public Convenience & Necessity (CPCN) from the Maryland Public Service Commission. A CPCN is essentially a package of permits authorizing construction of the facility. Construction began in late 2014 and remains underway.

Can I continue to farm over the pipeline?Yes. Crop farming is compatible with pipeline operations. Williams buries the pipe deeper in many agricultural areas to ensure it does not interfere with normal agricultural practices. When finished, Williams will restore the land using approved, modern mitigation techniques. With the exception of the yellow pipeline markers located at road and fence crossings, you’ll be hard-pressed to tell the pipeline is there.

What steps do you take to ensure the pipe is constructed and operated safely?As Williams builds the Rock Springs pipeline project, our top priority is ensuring that it is constructed and operated safely. Our construction practices exceed federal regulatory standards in a number of critical areas, including using thicker-walled steel pipe, x-raying all welds, and before placing theline into service, pressure testing the pipesections with water at a rate 1.5 times thenormal operating pressure.

Pennsylvania

Maryland

Y O R K

H A R F O R D C E C I L

L A N C A S T E R

© OpenStreetMap (and) contributors,CC-BY-SA

FOR DISCUSSION PURPOSESONLY SUBJECT TO REVISION

PROPOSED ROCK SPRINGSEXPANSION PROJECT

LOCATION MAP

TRANSCONTINENTAL GAS PIPELINE COMPANY, LLC

EXISTING TRANSCO PIPELINESPROPOSED 20" PIPELINECOUNTY BORDER 1 0 1 2 30.5

Miles

Su

sq

ue

ha

nn

a

Ri v

er

PROPOSED PIPELINE

©2015 The Williams Companies, Inc. All rights reserved. 0915/04623

Rock Springs Project Office 1848 Charter Lane, Suite 218 Lancaster, PA 17601

Major Facility ModificationsState County Scope

PA Lancaster 10.12 miles of 20-inch pipe

PA Chester Existing compressor facility modifications

MD Cecil 1.05 miles of 20-inch pipe

MD CecilOne 4,000-hp electric motor-driven centrifugal compressor

Project ScheduleOctober 2013 Pre-filing process began

November 2013 Ground surveys began

December 2013 Open houses and informational meetings

June 2014 7(c) application submitted to FERC

November 2014 FERC issues environmental assessment

March 2015FERC issues order approving the Rock Springs Expansion Project

September 2015 Pipeline construction began

August 2016 Target in-service

For More Information

Project website: www.williams.com/rocksprings

Toll-free information line: 866-455-9103

E-mail: PipelineExpansion@williams.com

Land Department: Rock Springs Project Office 1848 Charter Lane, Suite 218 Lancaster, PA 17601

Phone: 717-208-6019