Lopez A.,AMEC Environment and Infrastructure
Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM | Year: 2013
As the worldwide hydraulic fracturing 'fracking' market continued to grow to an estimated $37 Billion in 2012, the need to understand and manage radiological issues associated with fracking is becoming imperative. Fracking is a technique that injects pressurized fluid into rock layer to propagate fractures that allows natural gas and other petroleum products to be more easily extracted. Radioactivity is associated with fracking in two ways. Radioactive tracers are frequently a component of the injection fluid used to determine the injection profile and locations of fractures. Second, because there are naturally-occurring radioactive materials (NORM) in the media surrounding and containing oil and gas deposits, the process of fracking can dislodge radioactive materials and transport them to the surface in the wastewater and gases. Treatment of the wastewater to remove heavy metals and other contaminates can concentrate the NORM into technologically-enhanced NORM (TENORM). Regulations to classify, transport, and dispose of the TENORM and other radioactive waste can be complicated and cumbersome and vary widely in the international community and even between states/provinces. In many cases, regulations on NORM and TENORM do not even exist. Public scrutiny and regulator pressure will only continue to increase as the world demands on oil and gas continue to rise and greater quantities of TENORM materials are produced. Industry experts, health physicists, regulators, and public communities must work together to understand and manage radiological issues to ensure reasonable and effective regulations protective of the public, environment, and worker safety and health are implemented. Copyright © 2013 by ASME.
Wright L.,AMEC Environment and Infrastructure
Procedia Engineering | Year: 2014
Forcing the assigned demands on a system that lost a major portion of its supply may produce erroneous results such as unrealistically low negative pressures. A more realistic model would allow for the partial reduction of delivered water when the catastrophically-impaired network can no longer deliver the assigned demands. A number of auxiliary programs were developed to replace conventional system demands with various alternative demand constructs. These alternative demand constructs were then used to investigate the impact of catastrophic failure on model performance. Five different demand constructs are presented, applied to a water system model and subjected to catastrophic failure. © 2014 Published by Elsevier Ltd.
Norton M.,AMEC Environment and Infrastructure |
Lane A.,Halcrow Pacific Pty
Proceedings of Institution of Civil Engineers: Management, Procurement and Law | Year: 2012
An integrated framework for the management of water in England and Wales is proposed that optimises the organisation of service infrastructure, customers and stakeholders to derive optimal social, economic and environmental health. 'New Water Architecture' recognises the intrinsic links between water stakeholders, and between water and other essential resources, particularly food, energy and biodiversity. A systems-based approach strengthens integration of physical infrastructure, controlling institutions, and the overarching society consensus. Consideration is also given to future pressures with resilience to climate change strengthened by initiatives that slow water passage across the landscape. Implementation of the framework requires coordinated water policy across traditionally discrete resource sectors. This need is investigated alongside specific initiatives related to system management, abstraction licensing and pricing. Capital investment should be targeted towards 'low-regret' infrastructure argued to be high flow storage, aquifer storage and recovery, sustainable drainage systems and water transfers. These examples deliver multiple benefits and can be further optimised if existing networks, particularly inland waterways, are revitalised to enable regional integration of water sources.
Shepley M.G.,UK Environment Agency |
Shepley M.G.,Environment Canada |
Soley R.W.N.,AMEC Environment and Infrastructure
Geological Society Special Publication | Year: 2012
The predictions from a numerical time-variant distributed groundwater model are used to assess the spatial and temporal impacts of groundwater abstraction for an unconfined and layered, moderate diffusivity aquifer; the West Midlands-Worfe Permo-Triassic Sandstone in the UK. These impacts have been determined by comparing a recent actual baseline predictive simulation with simulations where groundwater abstractions are switched off, including a 'naturalized' simulation. By reference to the historic simulation, the predictive model results are compared against observed groundwater levels. The predictive simulations demonstrate that observed groundwater levels could be an indicator of groundwater abstraction impacts on surface water flows where widespread stream disconnection has occurred due to high rates of abstraction. This relationship also depends on the aquifer hydraulic characteristics, the interaction between groundwater levels and the surface drainage network and other artificial flow influences. Abstraction impacts on groundwater levels are large for the West Midlands-Worfe aquifer, but can be obscured by the climatic recharge signal in observed groundwater level records. This is a consequence of the moderate diffusivity and the main groundwater abstraction development preceding systematic monitoring. The groundwater model can be used to identify which observation boreholes have negligible abstraction impacts; this may be valuable for identifying groundwater level records that are useful for climate change analysis.
Lew M.,AMEC Environment and Infrastructure
Structural Design of Tall and Special Buildings | Year: 2011
L. LeRoy Crandall, President and Chief Executive Officer of his own company of LeRoy Crandall and Associates (LC&A) and a Director of the Board of Law Engineering, was active in the Civil Engineering profession serving proactively in leadership roles in professional societies. LeRoy Crandall and his firm of LC&A was involved in the more complex projects of the times, and this required innovative solutions and new technologies to be introduced to make the projects more feasible, constructible and economical. LeRoy Crandall was involved in the foundations of most of the tall buildings in Southern California and pioneering work in implementing tie-back shoring made large and tall buildings more constructible and allowed for deeper excavations. LC&A acquired equipment and software to allow for determining the dynamic soil properties of a site to allow for site characterization and permit the estimation of site-specific ground motions for design.