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Sewer Gas: An Indoor Air Source of PCE to Consider During Vapor Intrusion Investigations
Author(s) -
Pennell Kelly G.,
Scammell Madeleine Kangsen,
McClean Michael D.,
Ames Jennifer,
Weldon Brittany,
Friguglietti Leigh,
Suuberg Eric M.,
Shen Rui,
Indeglia Paul A.,
HeigerBernays Wendy J.
Publication year - 2013
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/gwmr.12021
Subject(s) - environmental science , indoor air , intrusion , sanitary sewer , infiltration (hvac) , health hazard , environmental chemistry , environmental engineering , water vapor , waste management , chemistry , engineering , environmental health , geology , meteorology , geography , medicine , geochemistry , organic chemistry
Abstract The United States Environmental Protection Agency ( USEPA ) is finalizing its vapor intrusion guidelines. One of the important issues related to vapor intrusion is background concentrations of volatile organic compounds ( VOCs ) in indoor air, typically attributed to consumer products and building materials. Background concentrations can exist even in the absence of vapor intrusion and are an important consideration when conducting site assessments. In addition, the development of accurate conceptual models that depict pathways for vapor entry into buildings is important during vapor intrusion site assessments. Sewer gas, either as a contributor to background concentrations or as part of the site conceptual model, is not routinely evaluated during vapor intrusion site assessments. The research described herein identifies an instance where vapors emanating directly from a sanitary sewer pipe within a residence were determined to be a source of tetrachloroethylene ( PCE ) detected in indoor air. Concentrations of PCE in the bathroom range from 2.1 to 190 µg/m 3 and exceed typical indoor air concentrations by orders of magnitude resulting in human health risk classified as an “Imminent Hazard” condition. The results suggest that infiltration of sewer gas resulted in PCE concentrations in indoor air that were nearly two orders of magnitude higher as compared to when infiltration of sewer gas was not known to be occurring. This previously understudied pathway whereby sewers serve as sources of PCE (and potentially other VOC ) vapors is highlighted. Implications for vapor intrusion investigations are also discussed.