On December 15, 2017, David Biderman, Executive Director and CEO of The Solid Waste Association of North America (SWANA) released comments in response to the Ministry of Environmental Protection (MEP) of the People’s Republic of China’s November 15, 2017, Notifications to the World Trade Organization (WTO) concerning restrictions on the import of solid waste.
We thank SWANA and Mr. Biderman for authorizing SCS Engineers to publish the comments for the benefit of all industry stakeholders and encourage you to share the letter.
Share this post using the icons at left, or download the SWANA letter using the button just under the letter window. SCS Engineers does not collect or share your contact information.
SCS Engineers will continue to publish articles, white papers, and blogs pertaining to this and other relevant issues on our website. You are welcome to contact us if you are looking for specific information on technical and business issues that concern you.
Using a simple example the authors make apparent the importance of understanding a refrigeration system’s actual performance. An energy balance is a very useful tool to do so.
Not only do PSM regulations require that facilities have this in your PSM program, there is real value in understanding a system’s capacities. Operation and efficiency translates to substantial dollar savings every year. Savings that can be reinvested in your facility.
Calculating the total consequences of an unbalance system is more complex, but there are considerable savings running a properly energy balanced refrigeration system. Savings that can fund maintenance needs and avoid postponing timely repairs.
This white paper, presented at the RETA 2017 Conference in Pennsylvania is available in English and Spanish by clicking here.
Learn more about environmental and engineering services for Process Safety Management (PSM), Risk Management Plans (RMP), and ammonia refrigeration safety at SCS Engineers.
SCS Engineers is a proud supporter of the SWANA Evergreen Chapter. the Chapter offers an annual scholarship to qualified undergraduate and graduate students in honor of Deborah Lambert. Ms Lambert was the SWANA Evergreen Chapter President 2002-2005, and we honor her for the many years she dedicated to the solid waste management field.
Please join us for our Winterfest Annual Holiday Party, which will be held today from 4:30 to 8:30 PM at the Bellevue Club, 11200 SE 6th Street, Bellevue, WA 98004. Enjoy fabulous food with friends and colleagues at the beautiful and festive Bellevue Club, the perfect way to start the holiday season! In addition to being a fun holiday event, Winterfest is our primary fundraising opportunity for our Educational Scholarship Fund.
Bellevue Club
11200 SE 6th Street
Olympic Suite A
Bellevue, WA 98004
High-density polyethylene pipes have been used for landfill leachate collection and conveyance lines for several decades because of the chemical compatibility of HDPE material with many different types of liquids and chemicals. Designing a leachate collection system for a landfill disposal cell involves numerous engineering analyses of different components involved in collecting and conveying leachate. One of the important engineering evaluations is a determination of structural stability of HDPE leachate collection pipes at the bottom of the landfill.
Structural Stability of HDPE Pipe
Modern landfills are gradually becoming larger and deeper; deeper landfills will naturally impose a higher surcharge loading on the HDPE leachate collection pipes below the waste column. Engineering methodologies for the structural stability evaluation of HDPE pipes with significant surcharge loading have been around as long as HDPE pipes have been in production.
There are three criteria used when evaluating the structural stability of HDPE pipes; wall crushing, wall buckling, and ring deflection. Wall crushing can occur when the stress in the pipe wall, due to external vertical pressure, exceeds the compressive strength of the pipe material. Wall buckling, a longitudinal wrinkling in the pipe wall, can occur when the external vertical pressure exceeds the critical buckling pressure of the pipe. Ring deflection is the change in vertical diameter of the pipe as the pipe deforms under the external pressure. Empirical formulas by HDPE pipe manufacturers or researchers are available to check each criterion.
SDR 11 vs. SDR 17 HDPE Pipe
When a structural stability evaluation involves high surcharge loading on the pipe, an engineer may automatically select SDR 11 HDPE pipe without going through an evaluation process. The engineer’s reasoning is that the higher wall thickness of SDR 11 pipe, as compared to SDR 17 pipe, is the logical choice because it provides a higher level of structural stability to the pipe. In the case of wall bucking and wall crushing, where the pipe strength in these two criteria is inversely proportional to the SDR value, the engineer is making the right choice. The strength is greater for the lower SDR value that represents thicker pipe wall thickness; making SDR 11 stronger than SDR 17.
However, in the case of ring deflection, the pipe strength is not a function of SDR, but a function of another parameter called allowable ring deflection. The allowable ring deflection value varies from one SDR to another and is generally reported by pipe manufacturers. The allowable ring deflection for SDR 17 pipe is greater than all other SDR pipes, which makes SDR 17 pipe stronger when considering ring deflection. SDR 17 pipe is also the most commonly used HDPE pipe in the landfill industry, being lighter in weight per unit length of the pipe than SDR 11, thus making it less expensive than SDR 11 pipe.
Which Is Best For My Landfill?
SCS Engineers recommends that landfill engineers consider SDR 17 pipe as the first choice for use as a leachate collection pipe below the waste column, and then other SDRs if SDR 17 does not pass the three structural stability criteria mentioned above.
Read more blogs by Ali Khatami, click here and type “Advice from the Field” in the search box.
National Waste and Recycling Association is sponsoring a FREE 90-minute webinar on December 6 at 3:00 pm ET. The webinar is highlighting the programs, strategies, and best practices of their six 2017 Recycling Award Winners.
The recipients will describe their unique blend of technologies, outreach, and program management that made a difference in their communities. The audience will have a chance to ask questions and find out how to implement these innovative ideas into their own operations and businesses.
Agenda:
More Solid Waste Management resources and success stories here.
We continue SCS’s Advice from the Field blog series with guidance from an article in MSW Magazine by Daniel R. Cooper, Jason Timmons, and Stephanie Liptak.
The authors of a recent article in MSW Management Magazine present engineering ideas that provide for more efficient construction of a GCCS. Gas system operators will benefit by having fewer pumps to operate and maintain and shallower headers that are more easily accessible. Odor management will be easier along with other benefits.
Read the full article here to learn about the design elements for maximizing long-term benefits, impacting: bottom liners, location of the blower/flare station, leachate risers, extraction well targets, and external header piping.
It is challenging to restore properties with a past, but you can do it on time and on budget if you plan ahead to address contaminated historic fill. Follow these tips and use the brownfield redevelopment checklist to keep your next redevelopment on track.
Design Phase
Consider how contaminated historic fill impacts the following:
Site feature locations – You can reduce or even eliminate landfill disposal costs by carefully selecting locations for your building, underground parking, parking lot, utility, and green space.
Storm water infiltration – Do you know that storm water infiltration devices must be located in areas free of contaminated historic fill? Infiltration devices cannot be located where contaminants of concern (as defined in s. NR 720.03(2)) are present in the soil through which the infiltration will occur.
Subslab vapor mitigation system – Already know you have contaminated historic fill on site? Consider adding a subslab vapor mitigation system to the design of your new building. It is usually much cheaper to install this system in a new building than to retrofit one into an existing building. It can also mitigate radon gas.
Planning & Design
Determine if contamination requires the following plans to manage the construction phase:
Material management plan – It establishes how you will separate excavated contaminated material from material that is not contaminated. It also outlines how you will handle contaminated material, either by disposing of it off site in a landfill or reusing it on site in an approved area such as a paved parking lot. This plan also covers screening, sampling, and testing contaminated materials, if required.
Dewatering plan – If the development requires excavation through contaminated historic fill to depths below groundwater, you will need a dewatering plan to properly manage discharge of the water. You may be able to discharge the water to the storm sewer or the sanitary sewer depending on the type and concentration of contaminants. You must determine local and state permit requirements before implementing your dewatering plan.
Demolition plan – The demolition plan for removing existing structures during redevelopment should include handling, removal, and disposal of potential contaminants such as lead and asbestos. The demolition plan should also address recycling and reuse of existing on site materials like concrete. You may be able to save money by crushing and reusing concrete on site as fill material, or by hauling and crushing it off site to reuse it as fill at another property. This approach can save you considerable money compared to landfill disposal.
Ready to start saving time and money addressing contaminated historic fill at your next redevelopment? Contact Ray Tierney for help evaluating your options in the Upper Midwest, or using the SCS Brownfield Redevelopment Checklist .
Live in another part of the country? SCS Engineers offers brownfields, remediation, due diligence, and all appropriate inquires services nationwide. Contact us today at .
Learn more about these services at SCS Engineers; read our case studies and articles:
Brownfields and Remediation
Due Diligence and All Appropriate Inquiries
Most often, landfill gas system design is added to an existing landfill cell, but the co-authors of this article explain the benefits of considering the LFG system during the landfill bottom liner design process. Doing so during the early stages of the landfill’s life, make it possible to improve collection efficiencies, lower operating costs, and save time in the future.
Continue to the full article, Planning Ahead for the Bottom Liners, published in MSW Magazine’s November 2017 issue and learn about the co-authors from Sarasota County, Florida Public Utilities and SCS Engineers.
How to stay in compliance, do what is right and avoid costly fines and litigation.
The State of California passed regulations in 2015 that impact all craft brewers (SIC Code 2082) who must comply with these regulations by either preparing and implementing a plan or certifying “no exposure” for their facility. While enforcement has so far been limited, the State maintains a searchable database by SIC code, and compliance determinations by government officials, environmental groups and other non-government organizations is comparatively easy.
Based on our research, the current compliance rate for craft brewers in California is relatively low. Those who don’t comply run the risk of fines or citizen suits by non-profits, which can be costly and time-consuming. Find out about the different types of compliance, what is involved, and how to stay in compliance.
A Qualified Industrial Storm Water Practitioner (QISP) can help you answer the following questions:
For more information or help with stormwater compliance in California, contact Dan Johnson at or the California Craft Brewers Association. If you are a CCBA member, you may access slides from a recent Webinar relating to Stormwater Compliance for Craft Brewers here. To sign up for our e-newsletter on stormwater and compliance tips send an email to .
Contact for stormwater compliance services in all 50 states.
Material recovery facilities (MRFs) are seeing many challenges that directly impact operations. Some of these challenges include: new recycled material quality standards from China, the ratcheting up of voluntary and mandatory local and state recycling goals, lower tolerance for worker injury, increasing volumes and a changing waste stream, disposal bans on organics in landfills, and high demand from emerging energy
markets for organics.
MRFs equipped with the latest technologies are able to meet tightening standards for traditional quality recycled materials and some are also starting to provide a separate, clean organics stream for downstream alternative energy projects. Many MRF operators are now benefitting from these new technologies, with increased throughput and quality of end product.
The article by Bruce Clark and Mike Kalish of SCS, provides an overview of the latest developments in MRF processing equipment systems that are helping owners and operators meet these challenges and at the same time helping maintain a healthy bottom line.
Related articles, case studies, and services.
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