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Welcome to Cornerstone's blog, which is devoted to providing useful information to our clients and industry professionals.

Our talented staff of bloggers will offer brief, thoughtful pieces on the topics facing our industry today.

CornerPost will feature tips and tools, lessons learned, observations about major conferences, and much more.

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7 June 2017

EPA administrator issues 90-day stay of NSPS XXX/Cf rules – what will it mean?

Faithful CornerPost readers know we have written about NSPS a few times. This time, I’m taking pen to paper (figuratively) to report on the recent 90-day Stay of Standards of Performance: Municipal Solid Waste Landfills and Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills (aka the NSPS XXX/Cf rules), which was issued on…

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Categories: Air Quality, Environmental Planning & Compliance, Landfill Engineering and Design, Operations and Maintenance, Solid Waste
Posted By Julie Hall at 2:42 PM  |  No Comments on EPA administrator issues 90-day stay of NSPS XXX/Cf rules – what will it mean?

17 May 2017

Solar energy generates revenue from closed landfills

Let’s face it – there are only so many revenue-generating uses for a closed landfill. Unless you generate enough landfill gas (LFG) to make power generation or other LFG use feasible, the closed landfill sits not generating any revenue for at least 30 years. That’s why siting a solar array on a closed landfill can…

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Categories: Alternative Energy, Biogas and Landfill Gas, Environmental Planning & Compliance, Solid Waste
Posted By Drew Lent, CPG at 11:30 AM  |  No Comments on Solar energy generates revenue from closed landfills

4 May 2017

How to avoid prematurely committing a landfill to NSPS compliance – carefully plan sampling to avoid positive bias

Landfill operators must conduct Tier 2 testing to calculate a landfill’s non-methane organic compound (NMOC) emission rate if the design capacity is greater than 2.5 million megagrams (MG). Favorable results of a Tier 2 test allows landfills to opt out of the New Source Performance Standards (NSPS) requirements to install and operate a gas collection…

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Categories: Air Quality, Biogas and Landfill Gas, Environmental Planning & Compliance, Landfill Engineering and Design, Solid Waste
Posted By Brad Albrinck, PE at 2:20 PM  |  No Comments on How to avoid prematurely committing a landfill to NSPS compliance – carefully plan sampling to avoid positive bias

19 April 2017

Coal combustion residuals – what should you consider before accepting them?

Unless you live under a rock, you know about the new CCR Rule, a RCRA Subtitle D Non-Hazardous Waste Rule that covers coal combustion residuals (CCRs). These include fly ash, bottom ash, boiler slag, and flue gas desulfurization (FGD) waste. I thought it would be interesting to share my thoughts on how the rules are…

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Categories: Air Quality, Alternative Energy, Biogas and Landfill Gas, Environmental Planning & Compliance, Environmental Remediation, Solid Waste
Posted By Don Grahlherr, PE at 11:30 AM  |  No Comments on Coal combustion residuals – what should you consider before accepting them?

5 April 2017

Planning stormwater and sediment erosion control measures to minimize construction delays

When it rains it usually pours – and when you are on a tight construction schedule it is imperative to minimize weather-related construction delays. That’s why it is so important to identify and implement effective stormwater and sediment erosion control measures during the construction planning phase for a landfill cell. These measures will help reduce…

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Categories: Environmental Planning & Compliance, Landfill Engineering and Design, Solid Waste
Posted By David Sonne at 10:34 AM  |  No Comments on Planning stormwater and sediment erosion control measures to minimize construction delays

15 March 2017

Landfill mining – what are the impacts on groundwater quality?

There’s gold in them thar landfills! Well, you might think so, given the increase in mining of municipal solid waste (MSW) from landfills in recent years. From less than ten landfill mining operations in the early 1990s we now have upwards of 100 MSW mining operations in progress in the U.S. MSW is mined for…

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Categories: Environmental Planning & Compliance, Environmental Remediation, Landfill Engineering and Design, Solid Waste
Posted By Bill Soukup at 11:30 AM  |  No Comments on Landfill mining – what are the impacts on groundwater quality?

1 March 2017

Biogas energy recovery at a California wastewater treatment plant – Lessons learned

I recently worked on a very interesting project in California to design a biogas energy recovery system for a wastewater treatment plant (WWTP). The system recovers nearly 100 percent of the methane produced from anaerobic digestion of wastewater sludge and conditions it for heat and power generation and transportation fuel. The design integrates a BioCNG™…

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Categories: Air Quality, Alternative Energy, Biogas and Landfill Gas, Environmental Planning & Compliance
Posted By Jessica Bernardini, PE at 11:30 AM  |  No Comments on Biogas energy recovery at a California wastewater treatment plant – Lessons learned

15 February 2017

Designing a stormwater conveyance system for steep slopes – balance performance and cost

When I look at solutions for stormwater conveyance systems at sites with steep slopes, I always want to come up with a solution that balances performance and cost and is not burdensome to the client in terms of risk and long term maintenance. I want to give them something that will hold up, will not…

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Categories: Environmental Planning & Compliance, Landfill Engineering and Design, Solid Waste
Posted By Brian Stone, PE at 11:30 AM  |  No Comments on Designing a stormwater conveyance system for steep slopes – balance performance and cost

1 February 2017

Ghosts of permits past – What may be lurking in old permits and how it may hurt your facility

If you are like most environmental personnel, you have all of your air permits in your site files in case an inspector ever asks about one. You probably think that everything is covered and you are in compliance since you have all those permits. I worked on a project for a site that had great…

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Categories: Air Quality, Environmental Planning & Compliance, Solid Waste
Posted By Julie Hall at 11:30 AM  |  No Comments on Ghosts of permits past – What may be lurking in old permits and how it may hurt your facility

13 January 2017

Landfill settlement – Account for it now to gain airspace later

Settlement tends to be a bad word when it comes to landfills. We think of the damage it can cause to landfill infrastructure and the difficulty faced by operators to maintain final waste grades. Worst of all, unplanned waste settlement can create unused airspace that is challenging and expensive to recapture. However, by accounting for…

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Categories: Environmental Planning & Compliance, Landfill Engineering and Design, Solid Waste
Posted By Laura Hammerer at 6:10 PM  |  No Comments on Landfill settlement – Account for it now to gain airspace later