rusty gibson: what if the lakes go dry, twca fall conference 2015

What if the lakes go dry?

The Emergency $130-Million Ward County

Water Supply Project

Texas Water Conservation Association

Freese and Nichols, Inc.Rusty Gibson, P.E.Nick Lester, P.E.

Colorado River Municipal Water District

John GrantCole Walker, P.E.

Ward County Water Supply Project

Texas Water Conservation Association

• Project need• Project schedule• Permitting• Construction manager-at-risk• Alternate procurement method - CSP• On-site mixed controlled low strength

material• Trench excavated embedment material• Summary and conclusions

INTRODUCTION

Texas Water Conservation Association

CRMWD SYSTEM• District provides water

for Big Spring, Odessa, Snyder, Midland, San Angelo, Stanton, Robert Lee, Grandfalls, Pyote and Abilene

• Serves 25 counties and 500,000 people in West Texas

• Current demands about 70 MGD

Texas Water Conservation Association

CRMWD SYSTEM MAP

Texas Water Conservation Association

RESERVOIR COMBINED CAPACITIES

Thomas, Spence and Ivie Reservoirs

Texas Water Conservation Association

2011 HEAT AND DROUGHT

Texas Water Conservation Association

Lowest Level77,000Ac-ft(6%)

Full1.2

million Ac-ft

BEFORE AND AFTER THE DROUGHT

Texas Water Conservation Association

LAKE SPENCE INTAKE STRUCTURE

Texas Water Conservation Association

WATER DEMANDS WERE UP

Texas Water Conservation Association

WARD COUNTY WATER RIGHTS

Texas Water Conservation Association

NEW WARD COUNTY SYSTEM

• Well Field– 21 new wells– 20 miles of well field piping– Well Field Booster Pump Station

• One transmission pump station (30 MGD)• 45 miles of 48- and 42-inch pipeline• Pump station at Odessa Reservoir (25 MGD)• New Big Spring Pump Station• Piping modification at Terminal Reservoir

Texas Water Conservation Association

SOURCES OF PROJECT FUNDING• Texas Water Development Board– State Participation Account–Water Infrastructure Fund

• Open Market Financing • CRMWD Contingency & Improvement

Fund

Texas Water Conservation Association

SCHEDULE AND CONTRACT STRUCTURE

Texas Water Conservation Association

DESIGN EXPEDITION• Design ideas to

expedite schedule– Aerial survey– Multiple teams: survey,

easements, SUE, design– Multiple equipment and

design packages– Pump station contracts

split into Below Slab and Above Slab Packages

Texas Water Conservation Association

SCHEDULE/COST SAVINGS

• Eliminate intermediate pump station with larger diameter transmission pipeline to save $6 million and allow higher capacity

Texas Water Conservation Association

• Design ideas to expedite schedule– Native embedment

material for pipelines– Use local concrete mix

design– Modified equipment

specifications (pre/post submittal meeting, materials, testing)

– On-site mixed controlled low strength material (CLSM)

CONSTRUCTION EXPEDITION

Texas Water Conservation Association

• Ideas to expedite permitting – Environmentalist

reviews to help pick route

– Multiple archeological teams

– Route avoided USACE 404 permit triggers

– Special measures to protect the threatened Sand Dune Lizard

PERMIT EXPEDITION

Texas Water Conservation Association

• Ideas to Expedite Land Acquisition – Route along existing pipeline/utility

corridors and roads– Three survey crews for boundary

surveys– Portions of Pipeline routed in public

streets to decrease number of easements

– Easement acquisition concurrent with bidding and pipe manufacturing/construction mobilization

LAND ACQUISITION EXPEDITION

Texas Water Conservation Association

• Construction ideas to expedite schedule– Two Pipeline packages for transmission

pipeline($3.6 million deduct for winner take all)

– CMAR for pump station construction and long delivery items (pumps, valves and electrical equipment)

– Two well drillers working 24/7– Transmission pipe made in five pipe

plants

CONSTRUCTION EXPEDITION

Texas Water Conservation Association

CONSTRUCTION MANAGER-AT-RISK• Owner hires CMAR to act as general contractor• Design Phase: Design reviews, innovations, and

management of cost and schedule• Construction Phase: Hires vendors, sub-contractors or

self performs construction• GMP established after all packages bid out• Reduces project delivery times – design and

construction can overlap• Owner retains control of design and equipment

selection• Produces fewer change orders

Texas Water Conservation Association

• CMAR packages– Big Spring PS Skid– Big Spring PS Site Construction– Pump and Motor Package– Valve Package– Electrical Package– Slab and Below for TPS, WFPS,

OPS– Above Slab for TPS, WFPS, OPS– Wellhead and Pump

Installation

CONSTRUCTION MANAGER-AT-RISK

Texas Water Conservation Association

• Competitive Sealed Proposals (CSP)– Expedite delivery and increase quality– Value based selection (not price only)– Selection criteria – cost, time,

qualifications, claims history, safety, and equipment performance

– Allows Owners to select Contractors/Vendors that have a record of on-time performance

ALTERNATE PROCUREMENT METHODS

Texas Water Conservation Association

• Transmission Pipeline crossed 4 miles of sand dunes in Monahan's Sand Hills State Park– Up to 30 feet of shifting sand

over pipe– Mobility of equipment was

difficult– Caving trench walls a

concern– Future maintenance and

repair difficult

ON-SITE MIXED CLSM

Texas Water Conservation Association

• Native materials – blow sand with some silts

• Portable batch plant used• CLSM used 2 Bags

Cement/CY• Mix was very flowable• Provided 50 psi strength

at 3 days and 200 psi at 28 days

• 30 CY of CLSM / hour• 500-600 LF of pipe / day

SOLUTION: ON-SITE MIXED CLSM

Texas Water Conservation Association

• Soil Modulus (E’) of 3,000 psi

• Provided side support in caving trench walls

• No delivery of concrete or gravel embedment required

• More robust design should reduce maintenance requirements

• Pipe deflection measurements verified quality

ON-SITE MIXED CLSM

Texas Water Conservation Association

• Native material – Sand and caliche/rock• Saved $5 million versus imported gravel– Material cost– Hauling cost– Disposal cost

• Material screened• Moisture addition is generally required• Material placed in lifts and heavy

compaction

TRENCH EXCAVATED EMBEDMENT MATERIAL

Texas Water Conservation Association

TRENCH EXCAVATED MATERIAL

• Native Material Design– Geotechnical investigations

of soils required– Finite element analysis of

pipe-soil interaction– Specification modifications

for bedding and compaction– Requires skilled contractor– Requires more quality

control testing

Texas Water Conservation Association

• Expedited Construction

• Saved Estimated $1.1 Million

• QC Tests to Verify Quality

WELD AFTER BACKFILL

Texas Water Conservation Association

TRANSMISSION PUMP STATION

Texas Water Conservation Association

TRANSMISSION PUMP STATION

Texas Water Conservation Association

ODESSA PUMP STATION

Texas Water Conservation Association

WELL FIELD PUMP STATION

Texas Water Conservation Association

WELLS

Texas Water Conservation Association

PROJECT METRICS• Original Budget

Design and Construction: $135 million

• Actual Budget Design and Construction: $113.1 million

• Schedule: 18 Months Design and Construction (2 weeks early)

• Initial Capacity: 30 MGD (Expandable to 50 MGD)

Texas Water Conservation Association

• Methods to Expedite Schedule

• Benefits of CMAR• Benefits of CSP• On-site Mixed

CLSM• Trench Excavated

Embedment Material

• Weld After Backfill

SUMMARY AND CONCULSION

Texas Water Conservation Association

PROJECT AWARDS

Texas Water Conservation Association

ACKNOWLEDGEMENTS