EPI personnel have been the principal engineers on projects throughout the continental United States. Our experience includes soil and ground water cleanup, treatability studies, landfill closure, stormwater management, permitting, and remediation at State and Federal Superfund sites. We also have experience in industrial and petrochemical process engineering. Engineering services at EPI are commonly tied in closely with site investigation and evaluation services to provide as comprehensive an approach as possible for soil and ground water cleanups. Personnel at EPI have extensive experience with remediation projects involving a broad range of contaminants including petroleum hydrocarbons, chlorinated solvents, metals and polychlorinated biphenyls.

Listed below are selected examples of our remedial design, engineering and O&M projects.

Project #1: EPI is providing remedial feasibility, selection, design, and engineering services to a Puget Sound-area company wishing to remediate a former manufacturing site under EPA’s RCRA program. Services have been integrated with extensive up-front site investigation and characterization work. Remediation has concentrated on groundwater cleanup and has included innovative No-VOCs™ technology, in situ oxidation, and bioremediation. Physical, chemical, and biological remedial approaches have proven cost-effective and provided rapid cleanup at this 109-acre facility. Selection of the appropriate technology was driven by site-specific technological considerations, cost minimization, and the input of regulators. Weekly operation and maintenance service is provided to the two No-VOCs™ wells on site and quarterly monitoring of groundwater quality is performed. Peripheral services include the preparation of work plans, health and safety plans, sampling and analysis plans, regulatory negotiations, and routine quarterly reports of data with remedial analysis and evaluation.

Project #2: A large, national energy production client retained EPI to provide engineering services for a myriad of projects throughout the US. Many of these projects involve engineering evaluation and analysis to support the client in making important business decisions. The decisions involve acquisition of new sites, closure evaluations of old sites, and environmental analysis related to expanding business operations. EPI has provided environmental oversight for the sale of manufactured gas plants, and calculated air emissions to support the evaluation of pipeline, rail, and ocean-going tankers for distribution of liquefied natural gas. One of the largest projects involved the redevelopment of a site formerly used to dispose of plating wastes for use as a gas distribution center. EPI provided all engineering services for this project including a feasibility study, engineering design of a soil cap remedy, and construction oversight of the selected remedy. EPI currently provides O&M monitoring of the site remedy.

Project #3: EPI’s role has evolved from providing oversight for the Pasco, Washington landfill remediation to providing all remediation services including remedial system O&M, groundwater monitoring, and a complete redesign of the four No-VOCs™ wells operation. As the client became more knowledgeable of our capabilities, it expanded EPI’s role to complete environmental responsibility. One of the most challenging aspects was a redesign of the remediation system for removal of organic solvents. Because remedial system performance had declined EPI performed a complete system analysis and recommended several equipment changes that increased removal efficiencies and reduced operating costs.

Project #4: EPI has used in-situ chemical oxidation technology to remediate soil and ground water at various dry cleaning facilities with chlorinated solvent impacts. The in-situ chemical oxidants have been delivered using a variety of mechanisms depending on site-specific conditions including horizontal wells, vertical wells, direct-push probes, and incorporated into backfill material. The oxidants used have included peroxide, Fenton’s reagent, permanganate, and commercial slow-release oxygen compounds. All of these sites have included soil and groundwater sampling and routine groundwater monitoring to verify cleanup.