Concept Environmental Services PFAS Storage & Containment. April 2018

Transcription

1 Concept Environmental Services PFAS Storage & Containment April 2018

2 Contents ANTICIPATED OUTCOMES... 2 COMPANY OVERVIEW... 3 ON-SITE STORAGE AND CONTAINMENT... 3 CONTAINMENT TANK CONSTRUCTION... 3 TECHNICAL OVERVIEW... 6 COMPONENT LIST... 6 COMPONENT DESIGN CODE & STANDARDS... 7 TECHNICAL PERFORMANCE... 7 Containment Tank... 7 Liner... 7 Liner Testing... 7 Satellite Monitoring System... 7 REVIEW... 8 Page 1 of 9

3 Introduction With the recent release of the PFAS National Environmental Management Plan (NEMP), Concept Environmental Services has developed a turnkey solution for the storage and containment of per- and poly-fluorinatedalkyl substances (PFAS) and Aqueous Film-Forming Foam (AFFF). Per- and poly-fluorinatedalkyl substances (PFAS) are described by the environmental industry as emerging contaminants with potential to cause harm to human health and the environment. In recent months PFAS contamination has received significant media coverage and the issue is now of significant public concern. Historically, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have been widely used in manufacturing and industry however in Australia, it has been used to make aqueous film forming foam (AFFF), a component of fire-fighting foams. PFAS compounds are synthetic chemicals and are non-biodegradable and do not degrade under typical environmental conditions. PFAS found in soil and groundwater can migrate considerable distances and permeate through different soils and sediments, surface and groundwater. PFAS are highly persistent in the environment and can bioaccumulate representing a health hazard to human and animal life. It is understood that these chemicals have contaminated multiple sites and the surrounding area across Australia at which AFFF has been used. EPA Australia, New Zealand (HEPA) and the Australian Government Department of the Environment and Energy (DoEE) have collaborated to develop a PFAS National Environmental Management Plan (NEMP). The Plan is designed to achieve a clear, effective coherent and nationally consistent approach to the environmental regulation of PFAS. Anticipated Outcomes Concept Environmental Services PFAS storage and containment solution will provide for temporary, short, medium and long term storage of PFAS contaminated waste. Temporary (up to 6 months) Short term (6 months to 2 years) Medium term (2-5 years) L Long term (greater than 5 years) holding facility for PFAS contaminated waste. Concept s solution supports a planned and implemented risk-based approach designed to minimise the potential for the storage facility to release PFAS into the environment, while addressing operational requirements for differing durations of storage. Concept s storage and containment tanks are designed and engineered with appropriate lining and bunds that the PFAS-contaminated material is isolated from the surrounding environment and tanks are equipped with satellite monitoring system that can provide real time storage data. Concept - PFAS Storage & Containment Page 2 of 9

4 Secure, reliable containment of PFAS contaminated waste materials Monitoring and data capture on condition of containment tanks Monitoring and data capture of fluid properties Monitoring and data capture of tank volumes across multiple sites Monitoring and data capture of processed volumes Mitigate risk of loss of containment through dual liner system Large volume (up to 50ML) relocatable fluid containment systems Single or multiple reticulated tanks Company overview Concept Environmental Services is Australia s leading provider of modular fluid storage solutions. Established in 2009 as an Australia Private Company, it maintains offices located in Brisbane, Qld and warehouse/laydown facility in Roma, Qld. Concept Environmental Services currently provides fluid storage solutions to clients across the oil & gas, mining and industrial sectors and maintains the following accredited management systems: Occupational health and safety management systems 4801:2001, Quality Management Systems 9001:2015, Environmental Management Systems 14001:2015 QBCC (Queensland Building & Construction Commission) Licence No: On-Site Storage and containment The following description is not exhaustive, but provides a high-level overview of the procedures and process of tank construction, liner installation and operation of the PFAS storage tank. Full details of applicable SOP s (Standard Operating Procedures) are available on request. Containment Tank Construction The containment tank comprises the following main components: 1) Modular tank 06.ML -1.4ML (Steel) - up to 50ML (Concrete). 2) A primary Polyvinyl Carbonate geomembrane containment liner to retain fluid within the tank. 3) A secondary Polyvinyl Carbonate geomembrane containment liner to capture and retain any fluid egress resulting from a breach in the primary liner. 4) A geotextile cushioning layer (base layer) installed as a buffer between the prepared pad and secondary containment liner. 5) A conductive geomembrane and geonet layer to provide liner integrity monitoring and assist with channelling any fluid egress from a breach in the primary liner to the internal sump. Concept - PFAS Storage & Containment Page 3 of 9

5 6) A spoon (concave) base to allow for an internal sump and the ability to recirculate leaked fluid back to the tank. 7) External sump with submersible pump 8) Tank monitoring system with remote satellite communication 9) Solar power supply skid A graphical representation of a typical containment tank is shown in Figure 1. FIGURE 1 TYPICAL PFAS CONTAINMENT TANK The containment tank is a free-standing structure constructed of concrete pre-cast concrete panels, galvanised steel support posts and steel cables. The containment tank does not require extensive civil works and in most instances, can be erected on a simple compacted earthen ring beam or pad. A concrete ring beam or base can be specified for long-term storage where the tank is unlikely to be relocated. Once the concave pad and pipework trenching has been excavated, a bitumus geomembrane bunding layer is installed. Pipework and internal sump is then installed and then the tank is constructed. On completion, a series of liner layers is installed. The first layer is a geofabric material applied to the floor and walls which provides a cushion for the first containment liner (secondary liner). The first containment liner is installed to the floor and walls. A penetration for the internal sump is fabricated using waterproof flanges and gaskets and then the liner and welds are tested to ensure integrity. A conductive geomembrane is then installed which provides for electrical integrity testing of the primary liner and leak detection location. Liner testing is carried out in accordance with ASTM D7002 and ASTM D7703. Concept - PFAS Storage & Containment Page 4 of 9

6 The final layer (primary liner) is then installed and the complete four-layer liner system is then secured on the top of the tank panels and capped off. The primary liner is then tested to ensure integrity prior to commissioning. The external sump with submersible pump is installed and connected to the internal sump pipework to provide a closed loop system. The level gauge is installed together with any additional monitoring telemetry with power for the entire system provided by a solar electricity skid. An indicative layout is shown in Figure 2. Loss of containment in the primary layer will result in an egress of fluid into the secondary liner. At this point the spoon (concave) base and geonet intermediate layer will channel the fluid and gravity feed the internal sump. The connected pipework will divert the fluid to the external sump where the level probe will activate the submersible pump. The submersible pump will continue to recirculate closed loop the fluid back to the tank via the sump return line. Telemetry will activate the satellite monitoring system and an alert sent to the monitoring base. Indicative Layout / General Arrangement FIGURE 2 *CONTAINMENT MONITORING SYSTEM OPTION Concept - PFAS Storage & Containment Page 5 of 9

7 Technical Overview The Concept Environmental s turnkey PFAS containment and monitoring system can be deployed as either a stand-alone package or as part of a larger network of containment cells. Due to the modular construction of the tanks, the cells can be erected and deconstructed easily for relocation. Typical installation not including earthworks for a 2ML concrete storage tank would be 7 days with a 1.4ML steel tank being erected in 2 days. Component List The following table provides an overview of the equipment and their functions that can be incorporated into the PFAS containment system design. Component Concept Concrete Tank (up to 50ML) Concept Steel Tank (0.6ML to 1.4ML) Function & Specification Summary Modular Fluid Containment Tank wall heights 1.8 5m. Fabricated pre-stressed concrete panels, post tensioned, free standing. Modular Fluid Containment Cell e.g. 1.4ML. 24.4m diameter, 3m height. Fabricated 2.3m x 3m rolled steel with steel box frame reinforcement. Primary and secondary fluid containment. Dual Liner System Polyvinyl Carbonate geomembrane. Polyvinyl Carbonate geomembrane is the primary geomembrane for containment. PFAS (10 years), temperature rated up to 90 C (194 F). Polyvinyl Carbonate geomembrane is the secondary geomembrane. Conductive geotextile is used for testing liner integrity during installation and containment monitoring*. A34 geofabric provides a cushion base for the liner. Spoon (concave) tank base to allow for an internal drain sump. Liner Breach Detection External sump with submersible pump to collect fluid in the event of a breach and recirculate leaked fluid back to the tank (closed loop). Level detection and optional fluid monitoring telemetry. Inlet/Outlet Manifolds Tank netting Satellite communication package for remote system monitoring. Through the wall, under the wall or over the wall inlet/outlet for filling and emptying. Protection to birds and other wildlife and prevention of waste migration through fauna Concept - PFAS Storage & Containment Page 6 of 9

8 Component Design Code & Standards The containment cell and components are designed and manufactured in accordance with Australian standards. Engineering design is RPEQ certified. Liner systems are manufactured by one of the world s largest producers of environmental geomembranes and controlled by registered quality management system which meets the requirements of the ISO 9001:2008 standard. Each liner product is certified to meet published Minimum Average Roll Value (MARV) specifications and mill certificates are available for each lot of geomembrane produced. Technical Performance Containment Tank The steel containment tank is manufactured from 5mm rolled steel plate with welded box section framing. Sections interlock using a tongue and pin jointing method. The concrete modular tank system comprises pre-cast concrete panels with thicknesses ranging from 125mm-185mm, vertical galvanised steel support posts and 12-15mm relaxed steel cables. Containment tanks typically range from 1.8m to 3m in height. Panel thickness and cable size are determined by tank capacity. Liner Polyvinyl Carbonate geomembrane is a maximum strength supported geomembrane and is formulated to withstand continuous temperatures up to 90 C (194 F) and to contain hydrocarbons at elevated temperatures. PFAS containment is warranted for 10 years. Liner Testing To ensure the integrity of the liner system, a series of tests are carried out during the fabrication and installation phase. These tests include Arc Testing (ELI-Electrical Liner Integrity) a process that employs leak detection equipment featuring an ammeter which registers an increase in current in the presence of a liner breach. Liner testing is carried out in accordance with ASTM D for installed geomembranes. Additional QA testing procedures during installation and fabrication can include independent thirdparty laboratory testing of liner samples and welds. Satellite Monitoring System The standard satellite monitoring system allows for remote monitoring of the tank conditions and the scalable sensor platform can be configured to provide additional telemetry including water quality testing and a range of other key data. The monitoring package includes but is not limited to: Satellite monitoring cabinet Water level probe Data logger Sensor connection bus (200 sensor terminals) Solar panel array and solar battery Solar regulator Page 7 of 9

9 Concept s remote monitoring system provides access to storage tank data and fluid volume management: Tank Management - Improves tank fleet utilisation. Tank Location - Identifies the exact geographic location of each tank. Volume Monitoring - Reports on the volume of fluid currently stored Processing Volume Reports and records the volume of fluid stored over a specified period Data Reporting System generated reports for waste tracking Review Storage and containment represents an important option in the management of PFAS contaminated materials. The concept modular tank is used extensively in the oil & gas and mining sectors to provide safe, reliable and relocatable storage solutions for regulated fluid waste. Due to their modular construction, Concept tanks offer a scalable solution with storage ranging from 60,000L to 53ML. Tanks can be reticulated into tank farms to increase storage capacity and can be configured for evaporation or sealed containment. Dual lining, bunded areas and leak detection systems combined with satellite monitoring provides a robust complete package for PFAS storage and containment for short, medium and long term applications. The use of large volume containment tanks deployed individually or across multiple sites offers the potential to effectively monitor, track and manage PFAS contaminated liquid and ensure compliance with the recommendation of NEMP and the continued protection of the environment and waterways. For further information or to discuss your project specific requirements, contact Andrew Bilton on or by abilton@conceptservices.com.au. Page 8 of 9

10 Concept Environmental Services 509 Zillmere Road, Zillmere, Queensland 4034 Telelphone: Fax: admin@conceptservices.com.au URL: