Environmental Engineering Reference
In-Depth Information
2.1. St. Louis Advanced Monitoring Initiative
The US EPA conducted an air quality study in St. Louis to quantify local, urban
and regional sources using a combination of ambient and source sampling (Duvall
et al., 2008). The St. Louis Advanced Monitoring Initiative (AMI) project was
initiated to assist the State of Missouri and the State of Illinois in developing a
State Implementation Plan (SIP) for fine particulate matter (PM 2.5 ) in the St. Louis
non-attainment area. The St. Louis area is impacted by several industrial point
sources, including U.S. Steel Corporation's Granite City Works. As part of the
St. Louis AMI project, source samples were collected from Granite City Works
along with upwind (Madison Fire House) and downwind (Granite City Fire
House) ambient PM and passive PM air samples to support receptor modeling and
SIP development for St. Louis. Twelve source profiles were obtained from the
Granite City Works to use in the source apportionment analysis. Excess PM mass
contributions from specific steelmaking processes, such as casthouse emissions,
are identifiable using a combination of facility-specific source profile information
and monitoring at upwind and downwind locations. The results indicate that steel
processing operations at the Granite City Works contribute greater than 2 μg/m 3 in
excess PM in St. Louis.
2.2. Dearborn SEAS Collocated Precision Study
A collocated precision study was conducted by US EPA in collaboration with
local partners in Dearborn, Michigan to evaluate the performance of the SEAS
sampler in an urban airshed. The objectives of the Dearborn SEAS Collocated
Precision Study were to understand spatial gradients of pollutants within heavily
industrialized communities, to quantify SEAS PM 2.5 collocated precision, and to
pilot US EPA multi-site hybrid receptor modeling methods. The SEAS is a glass
sampler void of denuders that collects gaseous and particulate species (Kidwell
and Ondov 2004). The SEAS allows for 15-min air samples which are collected in
slurry after preconcentration and subsequently analyzed for trace metals. Figure 1
depicts the relationship between the collocated SEAS instruments (US EPA and
Univ. of Michigan) for the Dearborn study. The linear regressions for vanadium
indicate consistent agreement between the collocated instruments at low and high
30
Vanadium
25
20
15
10
y = 0.9927x + 0.0119
R 2 = 0.9821
5
0
0
5
10
15
20
25
30
EPA SEAS (ng/m 3 )
Fig. 1. Dearborn collocated SEAS results for vanadium
 
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