a river runs through it · a river runs through it a summary of pcb assessment and cleanup efforts...
TRANSCRIPT
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A River Runs Through It
A Summary of PCB Assessment and Cleanup Effortsat the Former Riverside Wastewater Treatment Plant
Gateway Park, Fort Worth, Texas
Richard S. Talley, City of Fort Worth Water Department
Greater Trinity River PCB Impairment General Stakeholder Meeting
May 15, 2014
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Outline
History of former Riverside Wastewater Treatment Plant and Gateway Park
PCB Assessment Activities under TCEQ and EPA Regulations
PCB Remediation Activities and Associated Costs
Ecological Assessment of PCBs in Trinity River
Future of the Site
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Former Riverside Wastewater Treatment Plant (WWTP)
Operated from 1920 until 1979
Peak operation size of 143 acres
Relic buildings, clarifiers, trickling filters, sludge digesters, and sludge lagoons remain in place
History of Riverside WWTP and Gateway Park
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Extent of Riverside WWTP in 1979
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Gateway Park
Constructed in mid- to late 1980s and early 1990s
504 acres total, including former WWTP area
Parts of WWTP facility demolished
Athletic fields built in place6 softball fields3 soccer fields
Aerial photograph indicatesfill material for construction obtained from sludge lagoons
History of Riverside WWTP and Gateway Park
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Construction of softball fields shown on 1987 aerial photograph
Construction of soccer fields and parking lots shown on 1994 aerial photograph
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Former Riverside WWTP site enrolled in TCEQ Voluntary Cleanup Program (VCP) in June 2002
Environmental investigation conducted under TCEQ Texas Risk Reduction Program (TRRP) rules
PCBs – primary COC – triggers Toxic Substances Control Act (TSCA) requirements for waste disposal
Cleanup activities coordinated through TCEQ VCP (TRRP rules) and U.S. EPA (TSCA rules)
Regulatory Coordination
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Former WWTP footprint divided into four sectors
• Sector 1 - Former Plant Area 25.59 acres, 23 borings, 97 samples, 5 wells
• Sector 2 - Former Sludge Lagoons 62.15 acres, 255 borings, 724 samples, 8 wells
• Sector 3 - Softball Fields 34.74 acres, 43 borings, 187 samples, 2 wells
• Sector 4 - Soccer/Rugby Fields20.55 acres, 33 borings, 234 samples, 3 wells
PCB Assessment Activities
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Extent of former Riverside WWTP and Gateway Park in 2000
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Sector 1
Relic WWTP Structures
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Sector 2
Former Sludge Lagoons along
West Fork of the Trinity River
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Sector 3
Gateway Park Softball Fields
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Sector 4
Gateway Park Soccer and Rugby
Fields
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Findings
Sector 1 – Elevated PCBs in sludge in nine digesters; PCB cleanup under EPA’s TSCA rules
Sector 2 – Elevated PCBs in soils in several sludge lagoons; PCB cleanup under TRRP scheduled for 2015
Sector 3 – Low level PCBs and no human health risk; Softball fields opened in 2002
Sector 4 – Elevated PCBs in soils across sector; PCB cleanup under TRRP
PCB Assessment Findings & Cleanup Projects
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Sector 4 – PCB Cleanup Under TRRP
Soils on soccer/rugby fields contained elevated PCBs
6 removal action alternatives evaluated by Water Department & Parks and Community Services Department
Selected protective cap + synthetic grass playing fields
Protective of human & ecological health
Cost comparable to complete excavation & disposal
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Sector 4 – PCB Cleanup Under TRRP
Construction started in November 2005.
Completed in December 2006. New Athletic Field Layout
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Sector 4 – PCB Cleanup Under TRRP
Synthetic turf fields have been significant revenue generator
for the Parks Department
PCB cleanup costs associated with the protective cap and
turf fields in Sector 4totaled $4.8 million
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Sector 1 – PCB Cleanup Under TSCA
Nine relic digesters contained an estimated 5.7 million gallons of sludge (solid and aqueous phase).
PCBs detected in all digesters sampled with concentrations up to 32,600 mg/kg.
Performed pilot study to determine innovative treatment and disposal options for large volume of sludge.
Onsite treatment plant built to treat aqueous sludge.
Republic’s CSC Disposal Landfill in Avalon received TSCA permit from EPA in June 2004 to receive solid sludge.
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Sector 1 – PCB Cleanup Under TSCA
An rail car was used for the onsite treatment system. PCBs were removed from the aqueous sludge using
activated carbon and polymers.
Over 5 million gallons of water were extracted, treated onsite, and discharged to sanitary sewer.
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Sector 1 – PCB Cleanup Under TSCA
Over 29,177 tons of solid sludge was excavated and transported to CSC Landfillfor disposal as a TSCA waste
PCB cleanup costs associated with the
digesters in Sector 1 totaled $7.25 million
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11 former sludge lagoons along Trinity River
Sector 2 targeted for development as a wetland complex as part of Trinity River Vision Project.
Conceptual approach for corrective action involves excavation of all contaminated soils from lagoons and disposal at CSC Republic Landfill in Avalon, TX as TSCA-regulated PCB Remediation Waste.
Estimated 165,000 cubic yards of soil slated for disposal.
Probable Remedial Construction Cost - $8.365 million
Sector 2 – Proposed PCB Cleanup Under TRRP
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Sector 2 – Proposed PCB Cleanup Under TRRP
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Evaluation of PCBs in Surface Water and Sediment from Beach Street to East First Street adjacent to Gateway Park
• Water depths vary along the length of river evaluated
• Inflatable kayaks were used to transport equipment
Findings
No PCBs detected in sediment or surface water samples.
PCB Assessment in Trinity River
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Total PCB Cleanup Costs
Sector 1 – PCB Cleanup Under TSCA $7.25 million
Sector 2 - Proposed PCB Cleanup Under TRRP $8.365 million
Sector 4 - PCB Cleanup Under TRRP $4.8 million____
$20.4 million
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Future of the Site
Finalize Affected Property Assessment under TRRP
Complete Proposed PCB Cleanup in Sector 2
Demolish Relic Concrete Structures in Sector 1
Return Former Plant Area to Recreational Area along Trinity River Corridor as part of Trinity River Vision
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A River Runs Through It
A Summary of PCB Assessment and Cleanup Effortsat the Former Riverside Wastewater Treatment Plant
Gateway Park, Fort Worth, Texas
Richard S. Talley, City of Fort Worth Water Department
Greater Trinity River PCB Impairment General Stakeholder Meeting
May 15, 2014