rusty gibson: what if the lakes go dry, twca fall conference 2015
TRANSCRIPT
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What if the lakes go dry?
The Emergency $130-Million Ward County
Water Supply Project
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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
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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
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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
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Texas Water Conservation Association
CRMWD SYSTEM MAP
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Texas Water Conservation Association
RESERVOIR COMBINED CAPACITIES
Thomas, Spence and Ivie Reservoirs
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Texas Water Conservation Association
2011 HEAT AND DROUGHT
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Texas Water Conservation Association
Lowest Level77,000Ac-ft(6%)
Full1.2
million Ac-ft
BEFORE AND AFTER THE DROUGHT
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Texas Water Conservation Association
LAKE SPENCE INTAKE STRUCTURE
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Texas Water Conservation Association
WATER DEMANDS WERE UP
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Texas Water Conservation Association
WARD COUNTY WATER RIGHTS
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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
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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
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Texas Water Conservation Association
SCHEDULE AND CONTRACT STRUCTURE
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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
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Texas Water Conservation Association
SCHEDULE/COST SAVINGS
• Eliminate intermediate pump station with larger diameter transmission pipeline to save $6 million and allow higher capacity
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Texas Water Conservation Association
• Expedited Construction
• Saved Estimated $1.1 Million
• QC Tests to Verify Quality
WELD AFTER BACKFILL
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Texas Water Conservation Association
TRANSMISSION PUMP STATION
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Texas Water Conservation Association
TRANSMISSION PUMP STATION
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Texas Water Conservation Association
ODESSA PUMP STATION
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Texas Water Conservation Association
WELL FIELD PUMP STATION
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Texas Water Conservation Association
WELLS
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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)
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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
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Texas Water Conservation Association
PROJECT AWARDS
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Texas Water Conservation Association
ACKNOWLEDGEMENTS