TCEQ’s Lynchburg Ferry boundary reevaluation document今年5月林奇堡渡轮边界重新评估文件.docx

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TCEQ’s Lynchburg Ferry boundary reevaluation document今年5月林奇堡渡轮边界重新评估文件.docx

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TCEQ’s Lynchburg Ferry boundary reevaluation document今年5月林奇堡渡轮边界重新评估文件

Air Pollutant Watch List Boundary Supplemental DocumentationStyrene in Lynchburg FerryDraft Developed May 2011Air Pollutant Watch List (APWL)Boundary ReevaluationCounty: HarrisCity: HoustonTCEQ Region: 12APWL Site Number: APWL 1204Pollutant: StyreneBackgroundThe Texas Commission on Environmental Quality (TCEQ) has set pollutant-specific air quality guideline levels known as air monitoring comparison values (AMVCs) to protect human health and welfare for various air contaminants, including styrene. Styrene is a colorless to slightly yellowish oily liquid with a sweet, sharp odor. Styrene is widely used for the manufacture of polystyrene, rubber resins, and insulators, and it is a common cross-linking agent in glass fiber-reinforced and unsaturated polyester resins.Where ambient air monitoring indicates persistent concentrations above established AMCVs, the TCEQ establishes APWL areas. The purpose of the APWL is to reduce emissions by focusing TCEQ enforcement, permitting, pollution prevention, and monitoring resources and heightening awareness for interested parties in areas of concern. Ambient air monitoring data in Lynchburg Ferry demonstrates that no exceedances of the short-term health- or long-term health-based AMCVs occurred since the monitor was installed; however, multiple exceedances of the odor-based AMCV have been observed every year. In addition to the monitoring information, the Harris County Pollution Control Services Department has received numerous odor complaints over the years from citizens regarding the industrial facilities in the Lynchburg Ferry area.Lynchburg Ferry was identified as an APWL area for benzene and styrene in 2002. The Lynchburg Ferry APWL area for benzene was delisted in 2010 due to significant and persistent reductions in benzene emissions and ambient monitoring levels below the established AMCVs. The maps and narratives for the two Lynchburg Ferry APWL areas, including the list of potential companies, are identical; however