ONEOK Medford Fractionation South Stormwater Pond Project EFO - - PowerPoint PPT Presentation

ONEOK Medford Fractionation South Stormwater Pond Project

EFO Conference – October 2016

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Details

• The South Storm Water Pond was originally built over 40 years ago.

Over time, sediment from the surrounding terrain reduced the volume

• f the pond by approximately 16,000 cubic yards.
• Consequently, the pond required excavating and rework to enlarge its

capacity and to improve its potential spill protection capabilities.

• The pond now can contain approximately 4.1 million gallons, which

increases the capacity by over 33% of its original size.

• The new pond outlet was designed with a 24” diameter slide gate that

is maintained closed.

• In the event of a significant spill, the liquids will be contained within the

pond, preventing contaminants from leaving the site. In addition, during rainfalls, the pond can be utilized for retention to aid in the prevention of flooding downstream of the facility.

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Details

• Sediment Land Application Study was undertaken to determine if

contaminants were present in the sediment and the feasibility of land applying the excavated material.

• The Study revealed the sediment could be characterized as non-

hazardous.

• All results were favorable.
• The sediment was applied and disked into the soil. It is now part of the

top soil and crops have been planted on the acreage to reduce erosion.

• By land applying the sediment, we essentially returned eroded soil

back to its original location, we didn’t consume landfill space, and we saved over $650,000 in transport and disposal fees.

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Details

• The channel was designed to reduce the water velocity, allowing

for the suspended solids to settle in the channel prior to reaching the pond.

• Ultimately, the water quality at the pond discharge point has

been improved due to controlled discharge velocities and a reduction of turbidity in the pond.

• In addition, the channel was designed so that small dirt work

equipment, such as a skid-steer loader, can maneuver the channel sides and bottom, allowing for the removal of the sediment preventing it from returning to the pond bottom.

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Project Scope

• Phase One - Sediment Land Application Study
• Phase Two - Pond Construction
• Managed, designed, and constructed by Burns & McDonnell

Engineering.

• The pond upgrade provides additional storm water runoff

capacity as well as tertiary containment for potential spills.

• The project involved excavation, land application of the

excavated material, inlet and outlet reconstruction, and miscellaneous piping installations.

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Environomental Benefits

• Improved downstream water quality
• Additional pond storage capacity for potential spills and storm

water retention

• Reduced off-site waste disposal and beneficial reuse of

sediment/soil

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Project Cost

• Project Total Cost: $1,020,000
• Excavation and Sediment Land Application: $695,000
• Sediment Basin: $150,000
• Outlet Structure: $75,000
• Timber Mats, Safety Precautions, and Incidentals: $100,000

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