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Screening Health Risk Assessment for 3370 Hopyard Road Project Environmental and Regulatory Setting Bay Area Air Quality Management District The BAAQMD has jurisdiction over air quality planning for the San Francisco Bay Area Air Basin(SFBAAB), which consists of Alameda,Contra Costa, Marin,Napa, San Francisco, San Mateo, Santa Clara,southwestern Solano,and southern Sonoma counties. The BAAQMD adopted updated California Environmental Quality Act(CEQA)Air Quality Guidelines, including new thresholds of significance in June 2010,and revised them in May 2011 (BAAQMD 2012a). The Air Quality Guidelines advise lead agencies on how to evaluate potential air quality impacts, including establishing quantitative and qualitative thresholds of significance. The thresholds BAAQMD adopted were called into question by a minute order issued January 9,2012 in California Building Industry Association v. BAAQMD,Alameda Superior Court Case No. RGI0548693. The minute order states that"The Court finds [BAAQMD's adoption of thresholds] is a CEQA Project,the court makes no further findings or rulings." The claims made in the case concerned the CEQA impacts of adopting the thresholds,particularly,how the thresholds would affect land use development patterns. Petitioners argued that the thresholds for Health Risk Assessments encompassed issues not addressed by CEQA. As a result,the BAAQMD resolutions adopting and revising the significance thresholds in 2011 were set aside by a judicial writ of mandate on March 5, 2012. In May of 2012, BAAQMD updated its CEQA Air Quality Guidelines to continue to provide direction on recommended analysis methodologies, but without recommended quantitative significance thresholds. On August 13, 2013,the First District Court of Appeal ordered the trial court to reverse the judgment and upheld the BAAQMD's CEQA thresholds. California Building Industry Ass'n v. Bay Area Air Quality Mgmt. Dist.,Case No. A135335 & A136212(Court of Appeal, First District,August 13, 2013). The BAAQMD published a new version of the CEQA Air Quality Guidelines in May 2017,which includes revisions made to address the Supreme Court's opinion. The May 2017 guidelines retain the same thresholds of significance for air quality and GHG emissions as in the May 2011 version. The screening health risk assessment provided in this assessment uses the previously-adopted thresholds and methodologies from the 2017 BAAQMD CEQA Air Quality Guidelines to determine the potential health risk impacts to future users of the Project. The significance thresholds in the 2017 BAAQMD CEQA Air Quality Guidelines are based on substantial evidence identified in BAAQMD's 2009 Justification Report(BAAQMD 2009)as required by CEQA and are therefore used within this assessment. Sensitive Receptors Certain population groups, such as children,elderly, and acutely and chronically ill persons(especially those with cardio-respiratory diseases), are considered more sensitive to the potential effects of air pollution than others. Land uses such as schools, hospitals,and convalescent homes are considered to be relatively sensitive to poor air quality because the very young, the old, and the infirm are commonly located at these uses and are more susceptible to respiratory infections and other air quality-related health problems than the general public. Residential areas are considered sensitive to poor air quality because people are often at home for extended periods. Recreational land uses are moderately sensitive to air pollution, because vigorous exercise associated with recreation places a high demand on the human respiratory system. Since the Project would provide playground and outdoor activity areas for children,air quality health risk impacts are assessed in accordance with BAAQMD health risk evaluation methodologies,thresholds, and screening tools. CWIN\53247\1016910.1/Yountville Hill Winery Project 2 ESA/MSRGOO1AQ