Remedial Design and Engineering
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CJW can provide a comprehensive range of design, project management, construction oversight, contract administration, operation and maintenance, permitting, government liaison, environmental management and planning, and community relations' services. The result of these services is the successful completion of a variety of immediate or long-term site remediation programs.

CJW routinely provides services aimed at the in-situ treatment of soils and groundwater. This includes the use of hydrogen peroxide for the oxidation of contamination, bioremediation of soil and groundwater and treatment involving air sparging/soil vapor extraction or the use of dual-phase extraction. As a further service to our clients, CJW owns and operates its own pre-packaged groundwater and air treatment systems in weather tight trailers for rapid deployment in emergency conditions. CJW has also designed and supervised the installation of many low permeability caps aimed at controlling long-term exposures to contaminants in surficial soils.

Having worked on the design of many soil and groundwater treatment facilities, CJW's engineering staff understands the application of conventional, advanced, and alternative technologies. Because of our extensive hands-on knowledge of unit treatment processes, we can configure effective and efficient systems to reduce or remove any number of contaminants.

This includes:

  • Preliminary and conceptual designs ranging from vapor extraction/air sparging to multi-phase extraction and bioremediation;
  • Final designs, including detailed plans, specifications, and bid documents;
  • Turnkey design/build projects ranging from large-scale soil removal actions involving extensive shoring and utility support considerations to emergency installations of remediation systems under regulatory orders;
  • Contractor bidding and selection support; and
  • Ongoing operation, maintenance, and monitoring of in-place remediation systems.

CJW typically begins a remedial design and implementation program by formulating a conceptual remedial action design or plan. This plan is based on the most appropriate alternative determined during a prior remedial investigation and feasibility study. Next, CJW conducts pilot-scale testing, if necessary, then develops a preliminary and final design and prepares plans and specifications, cost estimates, and construction schedules.

Once the project proceeds to the construction phase, CJW assists the client with bid evaluation, contractor selection, and construction oversight and management. If preferable to the client, CJW works with a designated contractor on a design/build program. During each step of a remedial design and implementation program, the project team follows strict quality control guidelines.

Project design and engineering are supported by the firm's specialized computer-aided drafting and design (CADD) system. The project manager carefully monitors and coordinates each phase of the program so that an industry's specific deadlines, budget, and regulatory requirements are strictly followed.

Once the remedial system is constructed, CJW can continue to assist you with the initial start-up and operation, periodic maintenance, staff training, operation monitoring, troubleshooting, preparation of operation and maintenance manuals, and a variety of other services essential for maintaining regulatory compliance.

CJW is also experienced at developing remediation strategies for a wide range of site contamination issues. This involves not only addressing issues needed to bring the site into compliance with federal, state, and local regulations but also taking into consideration client goals such as available budget, future site uses, timing remediation activities to fit with related activities, and staging remediation to fit with available resources. We believe that the proper site remediation prevents extensive environmental damage; serious public health and safety risks; future liabilities, litigation, and regulatory actions, but also fits with the current and long term uses of the property. Evaluating the options and designing, and implementing a remedial program require specialized professional expertise and support.

Although many sites undergo expedited remediation without a formal feasibility study, many sites, because of their complexity or scope, still require the completion of a feasibility study in order to meet the requirements of regulatory closure. CJW has extensive experience in conducting feasibility studies to assess alternative remedial strategies for the particular site and type of contamination, and to identify the most appropriate and affordable solution. Critical to the feasibility study are the identification, evaluation, and selection of remedial alternatives that will reduce contaminant levels to acceptable regulatory standards. Typically, an initial screening of remedial alternatives is performed to identify reasonably likely options. These alternatives are then carefully weighed in terms of immediate capital and long-term operational cost, technical feasibility and effectiveness, environmental impact, regulatory acceptability, reliability, and public safety.