News & Events

To learn more about Cornerstone, review our list of regulatory updates, live webinars and press releases, as well as the schedule of conferences we will be attending.


November 9, 2017


Credit: iStock/lvcandy


Don’t miss Cornerstone’s Mark Swyka in this month’s issue of MSW Magazine!

In the article The Selection Process Guidance on how to choose and then work with consultants (MSW Magazine, Nov/Dec, 2017)Mark Swyka (Cornerstone’s Business Development Director) offers useful insights on the qualifying attributes of skilled and professional consultants as it relates to municipality projects.

Not all consultants are equal; Mark Swyka elaborates. “Does the consultant clearly demonstrate that they have your best interests at heart? Do they take the time to evaluate your needs – take the time to tell you the truth…even if you don’t like it?”

Read the Full Article Here


September 15, 2017


Check out Cornerstone’s Article in this Month’s MSW Magazine: Project Profile: Small-scale Biogas Technology for Alternative Vehicle Fuel, Steve Wittmann

Cornerstone Environmental Group
St. Landry Solid Waste Disposal District wins LMOP’s 2012 Project of the Year

With the growing interest in alternative fuels, Cornerstone’s patent-pending Biogas conditioning system – BioCNG™ helps revolutionize the solid waste and alternative fuel industries. The small-scale technology is making big impacts on communities around the nation. Biogas expert, Steve Wittmann explains the BioCNG™ system in more detail, with an overview of the footprint it has already made and impacts this technology will have on the future.

Read the full article here!


August 1, 2017

EPA administrator issues 90-day stay of Landfill NSPS – what does it mean?

EPA’s recent 90-day stay on the NSPS XXX/Cf rules issued by Scott Pruitt, administrator of the Environmental Protection Agency, pauses the timeline on implementing the NSPS XXX/Cf rules. The stay runs from May 31, 2017 through August 29, 2017.

Learn more here


Contact Julie Hall at 




May 17, 2017



We’re packing our bags and heading to the Sagamore…
We can’t wait to see you there!

Are you ready to have a great time at the NY Federation Conference? Come checkout what Cornerstone and our sister company AEG are up to this year at Booth # 708! 

Cornerstone and AEG carry on the tradition of being the funnest booth at the NY Fed – and this year, we’re going big! Think you have a steady hand? Come prove it at booth #708 with Tetra Tech’s Toppling Tower! This life-size (2+ feet tall!) version ups the stakes of the risky game of skill.

(If you love the game as much as we do, make sure to enter to take Tetra Tech’s Toppling Tower home and continue the fun!)

We’re also presenting! Checkout the line-up of our presenters and download the full agenda for more info on the events!


Monday A.M., May 22nd: BREAKOUT SESSIONS

The Long Tail of Leachate Management (0.5 PDH)
Arie P. Kremen, Ph.D.
Cornerstone Environmental Group, LLC

Landfills and Organic Bans: Are Anaerobic Digesters the Answer? (0.5 PDH)
Diane Conroy & Prentiss Shaw, P.E.
Cornerstone Environmental Group, LLC

Monday P.M., May 22nd: BREAKOUT SESSIONS

Phyto-Mitigation of Fugitive Hydrogen Sulfide Emissions (0.5 PDH)
Arie P. Kremen, Ph.D. & Ed Valis
Cornerstone Environmental Group, LLC

Tuesday A.M., May 23rd: BREAKOUT SESSIONS

Ethics Panel (1.5 PDH) – Nirvana
Mark Swyka, P.E., Gary DiPippo, P.E.
Cornerstone Environmental Group, LLC

Sustainable Landfilling: Evaluating the
Potential Impacts of Landfill Mining
on Groundwater Quality (0.5 PDH)
William Soukup
Cornerstone Environmental Group, LLC

Caisson Wells: An Alternative to Vertical LFG Well Construction (0.5 PDH)
Robert A. Holmes, P.E.
Cornerstone Environmental Group, LLC

Implementation of Final NSPS XXX Rules – Notifications,
Recordkeeping, and Reporting in the First Year
Scott D. Miller
Cornerstone Environmental Group, LLC


Download the Conference Program



March 16, 2017


It’s that time of year again! This time we’re packing our bags and heading to Reno, Nevada for 2017 SWANAPalooza!

March 27 – 30, 2017

We’re off to Reno, Nevada! It’s SWANAPalooza time and we’re excited to see you there. Make sure to stop by our booth (#323), we’ll be exhibiting with our parent company, Tetra Tech. We also have a great line up of presenters.


Tuesday, March 28th:

Practical Solutions to a Variety of Landfill Gas Problems

Bradford Albrink, Project Engineer, Cornerstone Environmental Group

Michael Contestabile, Project Manager, Cornerstone Environmental Group


Wednesday, March 30th:

Gas Conditioning — Practical Applications to Making Your Fuel Usable

Steven G. Wittman, Senior Client Manager, Cornerstone Environmental Group


Get the full conference agenda here



February 2, 2017

Credit: Cornerstone Environmental Group

Leading the charge in anaerobic digestion…

Cornerstone and its parent company Tetra Tech were recently mentioned in MSW Magazine as the leaders in the anaerobic digester project planning with an emphasis on RNG systems. Written by Daniel P. Duffy, “Waste In, Energy Out: The Costs and Benefits of Anaerobic Digesters”, the article focuses on the economic benefits of anaerobic digestion technology. In the article, Duffy focuses on two of Cornerstone’s RNG projects. Clean World Partners’ Sacramento South Area Transfer Station’s Organic Waste Recycling Center, in which Atlas Disposal trucks bring material to a food waste digester, then fill up their trucks with BioCNG vehicle fuel. As well as South San Francisco Scavenger Company’s (SSFSC’s) Blueline Transfer Station, which will use biogas from food and green waste to fuel SSFSC’s fleet of collection trucks.

Read more about the economic benefits of anaerobic digestion by following the link below.

Read the full article now



January 23, 2017



Cornerstone is exhibiting and sponsoring at the Wisconsin Integrated Resource Management Conference! You can find us in the exhibit hall located here. Also, don’t miss out on our presentations.

We’ll be presenting on:


Planning for Phased Capping, Tyler Field

Challenges of Exhuming a Superfund Landfill, Mark Torresani


Turning LFG into RNG and Selling it to Waste Haulers, Steve Wittmann

Planning to Prevent Leachate Spills, Mark Torresani


Get the full scoop on WIRMC 2017’s website!



January 18, 2017




Don’t miss Cornerstone’s landfill expert Rob Sochovka’s article published in Waste Dive! 

In his article, How industry changes will affect operational optimization of landfills, Sochovka discusses the inevitable that changes across the waste industry that will have major effects on the overall industry approach to optimizing landfill operations. Options for increasing landfill densities and compaction are huge game changers, as are government-mandated waste diversion and waste ban policies. Zero waste programs, commodity pricing, waste-to-energy and CNG fuel options, as well as other regulatory changes are expected to change how the industry does business in the next decade.


Read the full article on WasteDive





2017 Conference Schedule

Come visit us at one of this year's conferences!

US Composting Council, Compost 2016 Exhibition and Conference, Westin Bonaventure: Booth #223
January 23-26, 2017

NYWEA 89th Annual Meeting, Marriott Marquis, NYC
Feb 6-8, 2017

WIRMC 2017,The Osthoff Resort, Elkhart Lake, Wisconsin: We're exhibiting and sponsoring! Booth #45
Mar 01-03, 2017

SWANAPalooza 2017, Reno, Nevada: We're exhibiting and sponsoring! Booth #323
Mar 27-30, 2017

BioCycle East Coast, Turf Valley Hotel, Baltimore
April 04-07, 2017

SWANA Western Regional Symposium 2017, Monterey, CA:
April 10-14, 2017

Environmental Show of the South, Chattanooga Conference Center, Chattanooga, TN: We're Exhibiting: Booth #622
May 17, 2017

SWANA Federation of New York Sustainability Conference, The Sagamore, Bolton Landing, NY: We're Exhibiting with AEG Tetra Tech: Booth #708 and Presenting!
May 21-24, 2017

Florida SWANA Summer Conference; Sanibel Harbor Marriott Resorts, Ft. Meyers, FL
July 23-25, 2017

Seneca Meadows Open House; Seneca Meadows, NY. We're exhibiting!
July 30, 2017

Keystone SWANA; Hilton, Harrisburg, PA
September 06-07, 2017

NYASWM Fall 2017 SW Conference; Crowne Plaza, Lake Placid, NY
September 24-26, 2017

WASTECON; Baltimore Convention Center, Baltimore, MD. We're exhibiting (booth #1407)!
September 24-26, 2017

****Check back soon for more updates!****