Administrative Procurement Branch, Environmental Protection Agency, Fairchild Building -- 7th Floor, 499 S. Capital Street, S.W., Washington, DC 20024

B -- ANALYSIS OF PHOTOCHEMICAL ASSESSMENT MONITORING STATION (PAMS) DATE TO EVALUATE A REFORMULATED GASOLINE EFFECT SOL FZ0015 DUE 060297 POC Ms. Jones at 202-260-9031 WEB: NOT AVAILABLE, NOT AVAILABLE. E-MAIL: NOT AVAILABLE, NOT AVAILABLE. FOR DETAILED STATEMENT OF WORK, PLEASE PHONE. Reformulated gasoline (RFG) was introduced in a number of ozone nonattainment areas in January 1995. RFG usage was mandated in the nine areas with the worst ozone air quality problems and a number of other ozone nonattainment areas chose to opt into the RFG program. The Phase I RFG program is intended to reduce vehicle exhaust and non-exhaust emissions of volatile organic compounds (VOCs), and air toxics. The Clean Air Act requires that RFG produces at least 15% reductions in ozone-forming VOC emissions and toxics emissions in baseline vehicles. The Photochemical Assessment Monitoring Stations System (PAMS) was created in response to a Clean Air Act requirement for improved monitoring of ozone and its precursors. Regulations creating this system were promulgated in 1993, requiring enhanced monitoring in all serious, severe or extreme ozone nonattainment areas. The data collected at the PAMS sites include measurements of ozone, NOx, a target list of VOCs including several carbonyls as well as surface and upper air meteorology. The Office of Mobile Sources (OMS) is seeking a contractor to evaluate if the PAMS measurements provide some early confirmation of RFG's ambient air quality benefits, i.e. do these measurements indicate true reductions, rather than fluctuations in ambient levels of ozoneprecursor VOCs and toxics, and to what extent can such reductions be linked to the implementation of the RFG program? Examination of the PAMS data set to determine if it is sufficient in quantity, quality and scope to warrant further investigation at this time. If the data set is adequate, analysis of PAMS data to evaluate if statistically significant differences can be detected from comparison of measurements taken prior to and subsequent to the introduction of RFG. Other statistical analyses of PAMS data to detect changes or relationships which may be indicative of or consistent with an RFG effect. There are deliverables and more information. (0139)

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