Temporal variability in volatile organic compound concentrations in sanitary sewers at remediation sites

In recent years, there has been a growing recognition of the importance sewers as preferential pathways for vapor intrusion. This pathway involves volatile organic compound (VOC)-impacted migration through interior pipes or conduits towards potential receptor. A number research initiatives have undertaken to improve understanding this which, in turn, supports development sampling methods evaluate whether it is concern at given site. One aspect conceptual model that important risk sewer intrusion degree which VOC concentrations vary over time. paper presents results field conducted Texas, Utah, and California explore temporal variability chlorinated different timescales. These results, along with from other studies, suggest wide ranges can occur locations. However, long-term (months years) much higher than short-term (days). The timescale variations implications on frequency. multiple grab samples collected longer time period, such quarterly basis, are more appropriate characterizing average single time-integrated period hours days. Because often be logistically difficult collect, an may help practitioners balance logistics considerations data adequacy when sewers.