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Ponderosa Homes at 6900 Valley Trails Drive Initial Study and Negative Declaration d) Land uses such as residences, particularly when occupied by children or older adults, are considered to be sensitive receptors to poor air quality. The California Supreme Court has held that CEQA generally does not require analysis or mitigation of the impact of existing environmental conditions on a project, including a project's future users or residents. However, as with other laws and regulations enforced by other agencies that protect public health and safety, the City as the lead agency has authority other than CEQA to require measures to protect public health and safety. Therefore, this document includes for informational purposes an evaluation of the environment's impacts on the project. The evaluation includes an assessment of the project's potential to expose future sensitive receptors that would be located on the project site to sources of toxic air contaminants in the project vicinity. This analysis of the impacts of the environment on the project is provided for informational purposes only. There are no known stationary source emissions within the vicinity of the project site. However, the project site is located within 1,000 feet of 1-680 and West Las Positas Boulevard, each of which has average daily trips in excess of 10,000—the BAAQMD's threshold for analysis. According to traffic counts undertaken by the City in 2013, W. Las Positas Boulevard, east of Payne Road, reported 11,200 average daily trips.3 The project site is located a minimum of 600 feet south of W. Las Positas Boulevard and a minimum of 700 feet east of 1-680. Based on the BAAQMD health risk guidance, this section explores exposure of project residents to toxic air contaminants (TAC) from major roadways. Quantitative health-based thresholds identified in the 2011 BAAQMD Guidelines are identified in Table 1 below. The California Office of Environmental Health Assessment suggests an adjustment of cancer risk to reflect the fact that people are not home at all times. It estimates that people from the third trimester to age two or younger spend 85% of the time at home; ages two through 16 spend 72% of the time at home; and ages 16 years and older spend 73% of time at home.4 Using this value to calculate the estimated cancer risk, Table 2 below shows the adjusted cancer risk of the proposed development, taking into account the project's proximity to Valley Avenue. 3 City of Pleasanton. Traffic Engineering:Traffic Count Maps. <http://www.cityofpleasantonca.gov/gov/depts/cd/traffic/information/counts.asp>. Accessed February 26, 2017 4 California Environmental Protection Agency.Air Toxics Hot Spot Program Risk Assessment Guidelines-Guidance Manual for Preparation of Health Risk Assessments, February 2015: 8-5. 16