October 2018

History of Chlorinated Volatile Organic Compounds (CVOCs) Production, Use and Disposal

The large scale manufacture, use, and disposal of chlorinated volatile organic compounds (CVOCs) such as tetrachloroethene, trichloroethene, 1,1,1-trichloroethane, and carbon tetrachloride began in the first half of the last century and essentially ended in the 1990s. Between 1970 and 1976, the U.S. produced and consumed more than 6 billion pounds of carbon tetrachloride alone. That equates to over 450 million gallons. What happened to all of these materials?

Understanding the production, use and disposal patterns of these CVOCs can provide new insight and improve your understanding of where and when releases likely occurred, and why there are so many CVOC-affected sites out there.

Vapor Intrusion Fundamentals 44 – Types of Air Samples, Part 1

There are multiple ways to collect and analyze soil gas for Vapor Intrusion (VI), but currently, in the United States, most samples are collected into evacuated stainless-steel canisters, (also called “Summa” canisters – actually a brand name). But because canisters and their flow regulators are bulky, complex, and subject to mechanical problems, the VI community has long sought a simpler device, and some in the environmental community are moving toward sampling via sorbents. In this month’s issue of Focus on the Environment, we’ll discuss various types of sampling devices, together with a discussion of the use of electronic instruments.

News Regarding EPA’s Coal Ash Rule

On August 21, 2018, a panel of three judges from the U.S. Court of Appeals for the District of Columbia Circuit vacated large parts of the Obama-era coal ash disposal rule because of its leniency. This has far reaching implications for owners/operators of coal ash disposal units and the EPA.

Ohio EPA Updates Closure Plan Review Guidance

Unless exempted by regulation, units that manage hazardous waste (storage pads, tanks, etc.) are required to undergo RCRA Closure (or generator closure) at such time those units are no longer used to manage hazardous waste. Ohio EPA has recently updated their Closure Plan Review Guidance (CPRG), which historically has been a useful resource for both Ohio EPA and industry. Read more to understand some of the significant changes reflected in this most recent revision that are likely to affect your approach to completing closure.

Ohio 2018 Update Regarding Waters of the United States Rulemaking

Recent news in the continuing chronicle regarding “Waters of the United States” came in the middle of August when Judge David C. Norton of the U.S. District Court for the District of South Carolina terminated the EPA and Corps of Engineers joint rule that delayed the implementation of the Obama-era Clean Water Act (CWA) in his ruling on the South Carolina Coastal Conservation League (SCCCL), et al., versus Andrew Wheeler, et al. case. Since then, there have been some additional court rulings that affect the CWA.

Cox-Colvin & Associates, Inc.

Project Spotlight

Coming Soon in the November Newsletter

  • Use of the Temporary Authorization in RCRA Permitting
  • A Comparison of Various Types of Air and Soil-Gas Samples for Vapor Intrusion
  • Groundwater Modeling

Upcoming Events

Cox-Colvin & Associates, Inc. personnel are actively involved in the technical and regulatory aspects of the environmental field as it evolves. Cox-Colvin will be participating as presenters, sponsors, or exhibitors at the following environmental conferences in the coming months.

October 30-31, 2018: XI SEMINARIO EKOS BRASIL/SUSTREM 2018

10h00 – 12h00 SESSION 1: Solutions – Craig Cox (Cox-Colvin & Associates, Inc.) – will be presenting – Evaluation and Remediation of a Large Comingled Dilute Chlorinated VOC Plume in Sand and Gravel Aquifer – a Case Study

November 1, 2018:  The workshops offered at the XI Seminar Ekos Brazil is a partnership with the NICOLE Brazil (Latin America Network for Soil and Water Management) network.  Laurie A. Chilcote, (Cox-Colvin & Associates, Inc.) will be presenting a Intrusion of Vapors workshop in Brazil!  https://lnkd.in/dQ_42HV

December 5, 2018: Laurie Chilcote of Cox-Colvin & Associates, Inc. will be presenting at the Florida Remediation Conference at 1:55pm in Session 3B: Conceptual Site Model Development on Proven Method to Accurately Access Location & VI Potential to Better Define your CSM