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ORD VI-Research Duplex and Wheeler Building, Indianapolis- Summary of Evidence to Date: Temporal Variability in Long-term Mitigation Performance and Before Mitigation: What Causes It?
Citation:
Schumacher, B., JohnH Zimmerman, C. Lutes, B. Cosky, R. Truesdale, AND R. Norberg. ORD VI-Research Duplex and Wheeler Building, Indianapolis- Summary of Evidence to Date: Temporal Variability in Long-term Mitigation Performance and Before Mitigation: What Causes It? Presented at 25th Annual International Conference on Soil, Water, Energy and Air, San Diego, CA, March 23 - 26, 2015.
Impact/Purpose:
Present observations and statistical analysis on indoor air and soil gas data, collected over four years
Description:
We will present observations and statistical analysis on indoor air and soil gas data, collected over four years (including parts of five winter seasons) along with data on meteorological and hydrological variations at an unoccupied pre-1920 duplex. The monitoring program has now included a set of mitigation on/off tests as well as a year-long period of continuous post mitigation monitoring. Extensive time series statistical analyses were completed to examine the causes of temporal variability with and without the mitigation system operation. This presentation will address some of the frequently asked questions about this study, such as: • What is the role of preferential pathways, including sewer lines, in this data set? • To what extent are the features of this duplex and other well studied cases “typical” of the US housing inventory? • Is the VOC mass observed entering the duplex primarily from groundwater or vadose zone sources? • Why do chloroform and PCE differ at this site, in terms of sources and VI behavior? • What is the spatial and temporal variability of the observed attenuation factors? Additionally, new data will be presented from the 100,000 square-foot Wheeler Arts Building, which was an industrial facility from 1911 until 1995. Subsequent renovations converted the building into live-work lofts, office space and a theater. In this presentation we will present temporal variability data collected pre and post installation of a mitigation system was installed in 2010. Indoor VOCs include a mix of constituents dominated by vapor intrusion sources and those dominated by indoor sources. This presentation will focus on the performance of the mitigation system during a 6 month VOC monitoring period over the winter of 2013-2014. This case study will demonstrate relatively low post mitigation variability in a commercial building.