Announcements


NEW - Tygon Connectors!The Vapor Pin® Kit is designed to make your use of our products a success each time. However, one item was previously not included - the connector to match the barb fitting to the sample train. From this point forward, our kits will include Tygon connectors to bridge the distance between your sampling train and the Vapor Pin® Sampling Device. You may also purchase a bag of Tygon connectors separately or in 5 foot lengths.https://www.vaporpin.com/product/tygon-connectors-10-pieces/ ... See MoreSee Less
Vapor Pin is at Ferrara.
Vapor Pin
I'm thrilled to share with you the program of Remtech Europe 2021. This important environmental conference is made of 23 sessions fully ONLINE. Any session is completely FREE.To follow any session you have to register in our website https://remtech.meeters.space with a valid email. To reserve your seat, receive the presentations in pdf and receive your Certificate of Attendance of the session you will attend, you have to register in the Google form of each session. In each form you would find also the detailed program and beginning and end in different time zones. Reserve your seat today!SESSION 1 (Organized by JRC-European Commission) From policy talking to industry actions: Zero Pollution for Soil Mon 20 SEPTEMBER 09:00 – 13.00 CEST https://forms.gle/RhvqacpBJKrXvveq6SESSION 2 (Organized by US Army Corps of Engineers) TRAINING COURSE - PFAS: characterization, environmental impact, remediation strategies Mon 20 SEPTEMBER 14.30 – 19.00 CEST https://forms.gle/pSJzwMWt7G1mERUKASESSION 3 Sustainable management of contaminated sites Mon 20 SEPTEMBER 14.30 – 16.30 CEST https://forms.gle/GzgcfXHWEzTySktVASESSION 4 Waste tailings and acid mine drainage: challenges for Mining Sites Mon 20 SEPTEMBER 17.00 – 19.00 CEST https://forms.gle/RqQLnZqXeoJd5dKK8SESSION 5 Bioremediation and phytoremediation in agricultural, industrial, and military sites Tue 21 SEPTEMBER 09.00 – 11.00 CEST https://forms.gle/sScosaSUwsSh5AH79SESSION 6 Oil and hydrocarbons impacted sites Tue 21 SEPTEMBER 11.30 – 13.30 CEST https://forms.gle/VFx1Re2txyaxF2z78SESSION 7 HRSC, High Resolution Site Characterization Tue 21 SEPTEMBER 11.30 – 13.30 CEST https://forms.gle/okDrkFA8YrsAUhcRASESSION 8 (Organized by ASTM) TRAINING COURSE - ASTM STANDARDS: PFAS, Sediment and Climate Resilience Tue 21 SEPTEMBER 14.30 – 19.00 CEST https://forms.gle/pnz5H6edwFi6p1QA9SESSION 9 Innovative, digital and smart characterization techniques tools Tue 21 SEPTEMBER 14.30 – 16.30 CEST https://forms.gle/5MvheZmiPq5aQphW8SESSION 10 Circular Economy: how to apply it in the context of the next Generation EU Tue 21 SEPTEMBER 17.00 – 19.00 CEST https://forms.gle/tHBuZXpuraKiHYwi8SESSION 11 Soil remediation: can we deal in a sustainable way? Wed 22 SEPTEMBER 09.00 – 11.00 CEST https://forms.gle/Zh8gKvK1bn8BxcJk9SESSION 12 DNAPL and chlorinated compounds: optimize the process to achieve the target Wed 22 SEPTEMBER 11.30 – 13.30 CEST https://forms.gle/M8zcit6jQiNaBa446SESSION 13 (Organized by SERDP-ESTCP) TRAINING COURSE - Current Approaches for Vapor Intrusion Site Investigation and Mitigation Wed 22 SEPTEMBER 14.30 – 19.00 CEST https://forms.gle/q4BigJhPv891kG4U8SESSION 14 (Organized by Ramboll) TRAINING COURSE - Sustainability assessment as a tool for a more sustainable and resilient remediation of soils, groundwater and sediments Wed 22 SEPTEMBER 14.30 – 16.30 CEST https://forms.gle/LFBFwAaWqdnvPQUb8SESSION 15 PFAS, remediating the forever chemical Wed 22 SEPTEMBER 17.00 – 19.00 CEST https://forms.gle/H3yXyRzBshvKifBM9SESSION 16 Microplastics and sediments: two main threats for ports and coastal areas Thu 23 SEPTEMBER 09.00 – 11.00 CEST https://forms.gle/GQCAfXJ142r23r2B9SESSION 17 Sustainathon Thu 23 SEPTEMBER 14.00 – Fri 24 SEPTEMBER 14:00 CEST https://forms.gle/zCQBwt3eG1xBFGSM7SESSION 18 Aeriforms and vapor intrusion: measures and models Thu 23 SEPTEMBER 11.30 – 13.30 CEST https://forms.gle/m1KikTrbNncick936SESSION 19 Groundwater remediation in difficult conditions Thu 23 SEPTEMBER 11.30 – 13.30 CEST https://forms.gle/d9neHnF2sP9mN8hu6SESSION 20 (Organized by AESAS) TRAINING COURSE - State of the art of contaminated sites in Brazil Thu 23 SEPTEMBER 14.30 – 19.00 CEST https://forms.gle/Yy5hBLnzX2qngWcS8SESSION 21 River environment: managing impacts from different sources Fri 24 SEPTEMBER 09.00 – 11.00 CEST https://forms.gle/Ydgj3UFN13TTg3Yk8SESSION 22 Wastewater and sewer sludge, handling the last link in the chain Fri 24 SEPTEMBER 11:30 – 13.30 CEST https://forms.gle/L6Tsi5zPVfUpWQhEASESSION 23 TRAINING COURSE: Wastewater control and seawater quality: it is possible to do it acting differently? Fri 25 SEPTEMBER 14.30 – 19.00 CEST https://forms.gle/mvTELbnKXZr4S6cs5Feel free to share to your colleagues or to any contacts that you think he/she may be interested. REMEMBER THAT THE CONFERENCE IS FREE, NO FEES. JOIN US !See you online!Laurie A. ChilcoteRemtech Europe Ambassador ... See MoreSee Less
Vapor Pin is at RemTech Expo.
Vapor Pin
Decontamination and Decommissioning of Warehouses - Gela Industrial Site. - Author: Mariangela Venco (ENI Rewind) RemTech Expo ... See MoreSee Less
We are excited to announce our Brazil Patent BR 11 2018 004186-6 has been granted!#remediation #vaporintrusion #contaminatedsites #vaporpin #vi #coxcolvin #patent #Brazil ... See MoreSee Less
Don't miss out, join us next week at one or all of the following webinars to see and be seen!Tuesday - May 19th with Brownfield Summit, Craig Cox will be presenting at 10:35 EST - Evaluating and Remediating a Complex Contaminated Groundwater Plumehttps://www.brownfieldsummit.com/programmeWednesday - May 20th with MSECA - Craig Cox will be presenting on Sanitary Sewers as the Expected Preferential Pathway in Vapor Intrusion Evaluations.http://mseca.org/2020-05_-_Seminar.phpThursday - May 20th with Alpha Labs, Join Craig Cox and Laurie Chilcote as they do a live sub-slab demo Vapor Intrusion: Sampling with Confidence for Mid-Atlantic Stateshttps://register.gotowebinar.com/register/8677107578848466445 ... See MoreSee Less
We are excited to participate in the virtual seminar Vapor Intrusion: Sampling with Confidence for the Mid-Atlantic region, with Mark Mank of the Maryland Department of the Environment, Todd Creamer of Geosyntec Consultants, Christina Lewis at Langan Engineering & Environmental Services, Craig Cox at Cox-Colvin and Associates, Inc. and our own William Elcoate and Andy Rezendes. This event is free. NJ LSRP CEC Application for credits is pending. Registration is open: https://lnkd.in/djzaP9B ... See MoreSee Less
We are OPEN for business, stocked and ready to support you. Please be safe, wash your hands and practice social distancing! ... See MoreSee Less
We are OPEN for business. Just noticed are website has a hiccup. If you can't get online, please call our office for direct sales. 614-504-6915.We apologize for the inconvenience and hope to have the site back up momentarily! #vaporpin ... See MoreSee Less

Main Content

Vapor Intrusion Fundamentals 48 – Sanitary Sewers, the Preferential Pathway, Part 2


JUNE 2020 VAPOR INTRUSION NEWS


Sanitary Sewers, the Preferential Pathway, Part 2

By: Craig A. Cox, CPG

Published in the June 2020 VAPOR PIN® Newsletter

As discussed in the January 2020 installment of Vapor Intrusion Fundamentals (Number 47), sanitary sewer lines are becoming recognized as an important, yet often overlooked, pathway for vapor intrusion (VI).  In this installment, we will review approaches used to evaluate sewer connections and deciphering the associated analytical data collected during VI assessments.

As a reminder, VI assessments can be thought of as a three-legged stool, with each leg representing a contributing source that must be understood:

1 – contributions associated with soil gas,

2 – contributions associated with indoor sources, and

3 – contributions associated with preferential pathways.

Not understanding this third leg of VI assessment stool can lead to a misdiagnosis of the issues and implementation of ineffective mitigation efforts.

The first step in the assessment of the vapor contribution associated with sewer gas is to develop a sound conceptual site model (CSM) that recognizes and anticipates this preferential pathway.  Trunk sewer lines, especially those is areas served by industries that used solvents, can transport volatile organic compounds over relatively long distances downgradient and contaminate environmental media (soil and groundwater) through degraded sections and defects in the lines. These areas should be thought of as secondary point or line sources.  Assessing the locations of these secondary sources can be done through detailed inspections of the lines using cameras. Many communities have done these studies in preparation for sewer improvement projects.

Understanding the potential effect of degraded sewers on your study area is an important aspect of the CSM and the overall evaluation of a neighboring buildings and/or houses, however, most investigations begin with an assessment of a single building.  You can get a sense of the potential contribution of sewer gas on your building through the collection of sewer gas samples from nearby manholes and cleanouts.  In addition to your chemicals of concern (e.g., chlorinated VOCs), you should also analyze for other chlorinated and brominated compounds (e.g., chloroform, bromoform, and bromodichloromethane), as these compounds are typically found in sanitary sewer gas as a result of the breakdown of household and industrial cleansers.

As you begin your indoor air sampling campaign, review your sewer gas data closely.  If your chemicals of concern are found in sewer gas, then you should inspect the lavatories and areas containing floor drains as possible sampling locations.  If you collect samples from lavatories, conduct the sampling with the door shut and the fan running to induce air flow through plumbing leaks. After you receive the analytical results, review the dataset for the indicators of sewer gas (chloroform, bromoform, and bromodichloromethane) as well as the ratios of your chemicals of concern and compare them to your sub-slab and sewer gas data.  These comparisons will help you determine if the sanitary sewer represents a complete pathway for VI. In a recent study completed by Cox-Colvin, sewer gas was determined to be the primary pathway of VI at more than half of the buildings evaluated.

Accounting for the sewer gas VI pathway in your CSM provides you with additional insight into potential sources as well as appropriate means of mitigation. Sub-slab depressurization systems (SSDs) are very effective at interrupting the VI pathway associated with a sub-slab source; however, SSDs are typically not effective at mitigating the sewer gas source. If the VI pathway is dominated by the sanitary sewer line source, simple plumbing repairs could be enough to mitigate the VI issues.

Craig Cox is a principal and co-founder of Cox-Colvin & Associates, Inc., and holds degrees in geology and mineralogy from the Ohio State University and hydrogeology from the Colorado School of Mines. Mr. Cox has over 30 years of experience managing large environmental project implemented under CERCLA and state voluntary action programs. Mr. Cox is the inventor of the Vapor Pin® and has developed a variety of software products including Data Inspector, an internet-enabled environmental database application. Mr. Cox is a Certified Professional Geologist (CPG) with AIPG and is a Certified Professional (CP) under Ohio EPA’s Voluntary Action Program.