Featured Projects

Results That Speak For Themselves

We get to do a lot of interesting projects at EIL. These are some of our more interesting or unique experiences. Looking for some specific capability that you don't see here? Email or call us and let's talk.

Comprehensive, Cost-Effective Care of Closed Landfills

EIL served as environmental engineer, maintenance and compliance manager for two closed landfills for 15 years. Our team’s practical experience in permitting, groundwater, surface water and air as well as landfill gas and leachate reduced post closure care costs while maintaining regulatory compliance.

Landfill Construction Drawings and Contract Documents

EIL's Landfill Design Team has prepared detailed construction-level designs for 13 separate modules of the landfill over a 20+ year period. Working closely with the client, we engaged in continuous improvement processes to streamline construction documents, reduce construction costs, and minimize change orders.

GCCS Phasing & Capital Budgeting

Year-by-year GCCS phasing plans for nine active landfills completed under aggressive schedule. Critical to accurate capital budgeting and operations planning.

Landfill Permitting – Vertical & Horizontal Expansions

Due to a number of constraints, the landfill owner chose to divide an expansion project into two separate permit applications – one vertical and one horizontal. EIL’s team led the preparation of the two permit applications, completing some of the work in parallel under an aggressive schedule. This required careful coordination of the project team and strong management of a fluid scope, schedule and budget.

Gas System Improvements Increase Collection Efficiency and Reduce Condensate Management Headaches

EIL’s analysis of the gas piping network allowed the site to reduce the diameter of several new headers, saving cost and improving collection system performance. Field engineering by EIL allowed construction crews to work around undocumented existing infrastructure with minimal downtime and without compromising system performance.

Annual Airspace and Density Calculations

Knowing your airspace consumed, in-place density and remaining airspace are critical to understanding the efficiency of your operations. EIL’s team has performed annual airspace and density evaluations for dozens of landfills across the country.

Comprehensive Solid Waste Services at Regional LF

The City of Walla Walla wanted a firm specializing in landfills to help them find innovative ways to improve their operation to best-in-class status. A team led by EIL earned the work based on proven innovation, experience and cost-efficiency.

Year-By-Year Phasing Plans for Capital Budgeting – Your Landfill’s Roadmap for the Next 5 Years

Year-by-year phasing plans allow landfill owners to plan their capital budgeting efficiently using intuitive maps that everyone on the team can understand. Whether it’s a corporate requirement or you’re the boss and you want a concise, flexible, easy-to-understand plan, year-by-year phasing plans can make your capital budgeting process smoother, and most important, less time consuming.

Innovative Leachate Seep Remediation at Closed Landfill

EIL’s team implemented innovative remediation strategy to address chronic leachate seeps on the sideslopes of a closed landfill. Phytoremediation was more effective than conventional soil placement methods, and eliminated the need for expensive sewer connections or leachate hauling.

Construction-Level Designs for Multiple Landfills

Pprepared numerous construction-level designs over a 10+ year period. Implemented continuous improvement processes to increase constructibility, efficiency and effectiveness.

Landfill Master Plan, Permit Application and Construction-Level Design

Updated site’s master plan to improve road access, reduce earthwork multiple handling, improve poor weather operations, and reduce maintenance and operating costs.

Gas Collection System Troubleshooting Identifies Flow Bottleneck Locations More Accurately

EIL's LFG Team located bottlenecks in a gas collection system by comparing pressure losses from a pipe flow model of the wellfield to readily available field values of gas pressure. The method avoided unnecessary excavation and allowed the site to focus repair dollars on locations that provided the best bang for the buck

Closed Landfill Released from Post-Closure Care

EIL worked with state agencies over nearly five years to demonstrate that a closed landfill should be released from post-closure care obligations. These efforts saved the landfill owner tens of thousands per year in monitoring, air compliance and reporting costs.

Advanced Geosynthetic Interface Testing – Critical to Safe Operations

Geosynthetic interface testing is much more complex than it appears, and the consequences of getting it wrong can be a major slope stability failure. EIL’s landfill design team understands these complexities and can help you navigate this foreign territory safely and cost effectively.

Smart Regrading Plan Re-establishes Slope on Top of Old Landfill for Fraction of Cost of Conventiona

Top surface of closed, pre-Subtitle D landfill had settled and resulted in significant surface water ponding. Conventional regrading of the entire top to re-establish permitted grades would have been prohibitively expensive. Smart grading plan allowed site to ensure positive drainage across the top and minimize earthwork.

Leachate Forcemain, Automated Pumping System & Storage Tank

EIL’s work eliminated the need for tankers to navigate a narrow landfill perimeter road to reach individual leachate collection points on the landfill. Pipe sizing was optimized to keep flow velocities in the self-cleaning range, minimizing ongoing maintenance.

Closed Site Assessment, Design, Permitting & Compliance

EIL’s closed site management team brings deep experience and innovative ideas to the unique challenges of closed landfills. From assessment through construction, our approach ensures environmental protection and regulatory compliance while minimizing long-term costs.

Development and Implementation of an Integrated Post-Closure Care Plan

EIL performed a global assessment of a closed landfill with a history of regulatory challenges and operational problems. With the prioritized list of issues developed during the assessment, EIL helped the client to formulate and implement a comprehensive plan to improve compliance and reduce long-term monitoring and maintenance costs.

EIL's Knowledge of Air Regulations Allows Owner to Obtain Air Construction Permit Without PSD

EIL’s team took over an extremely time-sensitive air permit application for a landfill expansion from another consulting firm that was not meeting deadlines. Our team was able to obtain a draft permit without having to prepare the permit application and responses under the PSD program, which resulted in significant cost and time savings for the owner.

Air Permitting for Landfill Gas Power Plant Under Challenging Circumstances

EIL obtained a USEPA Treatment Applicability Determination for the proposed power plant to exempt it from NSPS testing, monitoring, recordkeeping and reporting requirements, as well as NESHAP requirements.

Gas Sampling and Analysis of Landfill with Highly Elevated Temperatures

EIL prepared and implemented a highly detailed gas sampling and analysis plan under intense regulatory scrutiny. The sampling and evaluation work provided assurance to all stakeholders that uncontrolled exothermic reactions were not occurring.

Design of Bedrock Gas Extraction System to Address Off-Site Gas Migration

LFG was detected in commercial structures adjacent to an active landfill. EIL diagnosed the operational problem and designed a perimeter gas extraction system.

Long-Term RD&D Landfill Liquid Addition Program Support

After leading the effort to obtain the initial RD&D permit to add leachate and other liquids to the landfill, EIL assisted for landfill owner for over 10 years with implementation and management of the liquid addition program.

Successful PSD Permit Applications Leaves the Door Open for Future Expansions

EIL's team of experienced air quality professionals build long term strategies that solve today’s problems without sacrificing tomorrow’s opportunities.

Integrated Flare & Power Plant Operation Improved Compliance & Reduced Cost

Integrating flare & power plant operations with VFD’s help to minimize odors and wellfield tuning costs, and reduced gas system operating costs by $30,000

Landfill ET Cover Permitting

EIL's Landfill Team obtained one of the first permits in Oregon to construct a soil-only, evapotranspiration (ET), final cover This saved the landfill millions of dollars in final cover construction costs with the approval of this cover system.

Design of 550 Acre Evaporation Pond Complex

As part of a design-build team working under an extremely short deadline, EIL’s engineers designed approximately 550 acres of geomembrane-lined evaporation ponds for a mineral mining operation. By combining experienced engineers, advanced cad software and spreadsheet-based volume modeling, the EIL team was able to prepare multiple options in a fraction of the time typically required.

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