detailed accomplishments by taskaqrp.ceer.utexas.edu/projectinfo/10-021/10-021 tech...county...
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TASK ORDER TITLE: TASK Order No.:
Subawardee: Richard L. Corsi
Date Submitted: December 8, 2010
Report No. 2 Reporting Period: November 1, 2010 to November 30, 2010
Subawardee Invoice Number that accompanies this Report:
Amount of funds spent during this reporting period:
DetailedAccomplishmentsbyTask(IncludeallTaskactionsconductedduringthereportingmonth.)
Phase1.The first phase of this project is focused on experimentally quantifying ozone surface reaction
resistances for a wide range of building materials. These measured reaction resistances will then be
used in the second phase of the project to modify the CAMx model. This phase of the project is divided
into two major tasks: determination of the surface resistances (P1‐1) and the estimation of quasi‐
laminar sub‐layer resistance at field sites (P1‐2).
Task P1‐1: Determination of bulk surface resistances.
Sub‐Task P1‐1.1. Selection of materials. A list of 16 priority building materials to be tested has been
compiled (Table 1). The list consists of three asphalt pavement types (spanning typical roadway and
parking lot properties), four concrete types (used for both roads and structures), five wall coverings
(clay brick, limestone, stucco, fiberboard, and wood) and four roofing materials (two asphalt
shingles, membrane, and built‐up asphalt). Material selection was based on the total area
contribution of each material in the City of Austin and the estimated relative reactivity of each
material. The total area of each material was determined by analyzing information from the Travis
County Appraisal District (TCAD) database, the Texas Department of Transportation (TxDOT)
Pavement Management Information System (PMIS) database and the City of Austin’s 2003
transportation GIS shape file. Additional information on the current use of materials in new
construction and some donated sample materials were gathered from local construction suppliers.
A secondary list of nine materials was selected to test if time permits (Table 2). These materials are
used on buildings throughout Travis County, but at lesser quantities than priority materials. Road
dust contains tire rubber which is likely to be reactive with ozone. This material was suggested
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during a November 8th meeting between the project team and Jim Smith and Mark Estes of the
TCEQ.
Table 1: Sixteen building materials to be tested.
Type Material Notes
road asphalt
road asphalt
road asphalt
road concrete roads/buildings
(0.4 porosity with fly ash)
road concrete roads/buildings
(0.4 porosity without fly ash)
road concrete buildings/bridges
(0.3 porosity without fly ash ‐ stronger)
wall concrete buildings
(0.4 porosity with fly ash with latex paint)
wall brick clay unpainted
wall stone limestone
wall wood painted
wall stucco painted
wall fiber cement
roof asphalt shingle three tab (flat)
roof asphalt shingle dimensional (raised)
roof membrane 1
roof built up asphalt
Table 2: Nine secondary building materials (to be tested if time allows).
Type Material Notes
road dust
wall brick clay painted
wall vinyl
wall wood unpainted (fence)
wall glass
roof asphalt shingle different brand of dimensional
roof metal 1 (coated steel) coated steel
roof clay tile
roof membrane 2 PVC or EPDM
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In addition to installing the six‐port valve the following actions relating to this task were taken in November:
The 2B‐Technologies Ozone Calibration Source was validated using EPA certified ozone
monitors at the Texas Commission on Environmental Quality; results will be summarized in
the monthly report for December.
Stainless steel diffuser tubing was installed in each chamber to ensure consistent, even flow
of air over the materials. The ¼” diameter inlet and outlet tubes are 19” long and have
~1/24” holes drilled every ½ inch along their length.
The valves controlling the flow through the ozone generator were redesigned and rebuilt to
allow different gas flows and pressures during the warm up period of the generator and the
actual experimental run.
Communication between the computer and six‐port selector valve was established and a
program was written to automatically advance the valve.
The flow through the six‐port selector valve was validated.
Sub‐Task P1‐1.3. Determination of initial surface resistances and diurnal variations/regeneration.
Due to delays in delivering of the valve no work on this task was conducted during the reporting
period.
Sub‐Task P1‐1.4. Determination of longer‐term in‐field variations in material reactivity. No work
on this task was conducted during the reporting period. This task is not scheduled to be started
until December, 2010.
Task P1‐2: Estimation of quasi‐laminar sub‐layer resistance at field sites.
Sub‐Task P1‐2.1. Selection of test compound. Naphthalene was selected as the test compound for
preliminary investigations. Moth balls were purchased to allow preliminary studies to commence in
December, 2010.
Sub‐Task P1‐2.2. Fabrication of mass transfer plates. Stainless steel paint can lids were selected to
be tested for use as mass transfer plates in preliminary investigations.
Sub‐Task P1‐2.3. Preliminary tests. No work on this task was conducted during the reporting period.
This task is not scheduled to be started until January, 2011.
Sub‐Task P1‐2.4. Field studies. No work on this task was conducted during the reporting period.
This task is not scheduled to be started until March, 2011
Phase2.The second phase of the project focuses on modifications to the dry deposition algorithm used in CAMx
based on new experimental data related to material surface resistances and spatially resolved
characterization of built environment surfaces (BES) in the urban landscape. This phase of the project is
divided into three major tasks: characterization of BES in the Austin urban landscape (P2‐1), pre‐
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processing of the new land use/land cover data into the appropriate format for CAMx and modification
of the dry deposition algorithms in CAMx (P2‐2), and air quality modeling and analysis of the impacts on
ozone concentrations (P3‐3).
Task P2‐1: Characterization of BES in the Austin urban landscape.
Collection of existing databases for the characterization of BES in Travis County has largely been completed this month. On‐going efforts have focused on the analysis and processing of the data. A working draft project report (not intended for public release) is attached and describes the framework of the dry deposition algorithms in CAMx, the magnitude and temporal variations of the deposition resistances and velocities for the urban and other land use categories in Travis County, and the BES and urban tree cover databases for the study. Ground‐based surveys will be conducted to supplement the existing data resources. Task P2‐2: Preparation for CAMx modeling.
Sub‐Task P2‐2.1. Land cover/land use data processing for CAMx. No work on this task was
conducted during the reporting period. This task is not scheduled to be started until April 2011.
Sub‐Task P2‐2.2. Modification of the CAMx Dry Deposition Algorithms. No work on this task was
conducted during the reporting period. This task is not scheduled to be started until April 2011.
Task P2‐3: CAMx Modeling and Sensitivity Studies. No work on this task was conducted during the
reporting period. This task is not scheduled to be started until May 2011.
PreliminaryAnalysisPhase1.The only preliminary analysis completed to date involves the testing of various components of the
experimental system.
Sub‐Task P1‐1.2. Modification and performance testing of experimental system. Several
preliminary tests have been performed on the experimental system:
Ozone monitors. The primary ozone monitor instrument was tested after routine maintenance by the manufacturer.
Startup time. While waiting for the delivery of the six‐port valve, additional tests were completed to determine the length of time needed to warm up the UV lamp in the ozone generator and the time required to reach a steady‐state relative humidity in experimental chambers. These tests show that the ozone generator needs to be on for two hours prior to the injection of ozone into the chambers. In addition, the relative humidity in the chambers required up to four hours to achieve a steady‐state value. Hence, the chambers will be loaded the night prior to an experiment and allowed to equilibrate (both the temperature and relative humidity) overnight prior to the introduction of ozone.
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Phase2.Please see the attached working draft project report.
DataCollected
Phase1.A majority of the second month was dedicated to selecting materials and modifying the experimental
apparatus. No surface resistance data were acquired during the reporting period.
Phase2.Please see the attached working draft project report.
IdentifyProblemsorIssuesEncounteredandProposedSolutionsorAdjustments
Phase1.The critical component of the experimental system is a six‐port multiple selector valve that allows the
automated sampling between chambers. As described above the valve was received November 22nd
and installed as soon as possible.
Phase2.None identified this period.
GoalsandAnticipatedIssuesfortheSucceedingReportingPeriod
Phase1.Material selection has been completed. Acquisition of the materials will continue throughout the next
month (Task P1.1.1). Modifications to the full experimental apparatus were completed on November
30th. Full system testing commenced on December 1st (Task P1.1.2). Experiments to determine surface
resistances (Task P1.1.3) are anticipated to begin in December, 2010.
Phase2.The team will continue the analysis and processing of existing databases and the development of the
working draft project report. The team will also initiate the design of the field surveys.
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Detail
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