RES 211231 Exhibit A - Laserfiche WebLink

City of Pleasanton–10x Genomics Project Environmental Checklist and Initial Study/Mitigated Negative Declaration Environmental Evaluation FirstCarbon Solutions 39 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx c) Expose sensitive receptors to substantial pollutant concentrations? Less than significant impact. The BAAQMD defines sensitive receptors as the following: “Facilities or land uses that include members of the population that are particularly sensitive to the effects of air pollutants, such as children, the elderly, and people with illnesses. Examples include schools, hospitals, and residential areas.” The closest sensitive receptors would be multi-family residences approximately 130 feet east of the project site across from Stoneridge Mall Road, as well as multi- family residences approximately 200 feet south of the project site across from Stoneridge Drive, and multi-family residences 175 feet southwest of the project site across from Stoneridge Drive. (While these nearby land uses represent the closest sensitive receptors to the proposed project, they do not necessarily represent the location of the maximally impacted sensitive receptor during construction activities.) The following four criteria were applied to determine the significance of the exposure of sensitive receptors to project emissions based on the health risk and hazard significance thresholds shown in Table 1. • Criterion 1: Construction of the project would not exceed the health risk significance thresholds. • Criterion 2: The cumulative health impact would not exceed the cumulative health risk significance thresholds. • Criterion 3: The project's operation would not result in an exceedance of the health risk significance thresholds. • Criterion 4: A CO hotspot assessment must demonstrate that the project would not result in a CO hotspot development that would cause an exceedance of the CO ambient air quality standards. Criterion 1: Project Construction Toxic Air Pollutants An assessment was made of the potential health impacts to surrounding sensitive receptors resulting from toxic air contaminants (TAC) emissions during construction. A summary of the assessment is provided below, while the detailed assessment is provided Appendix A. Diesel particulate matter (DPM) has been identified by the California Air Resources Board (ARB) as a carcinogenic substance. Major sources of DPM include off-road construction equipment and heavy- duty delivery truck and worker activities. For purposes of this analysis, DPM is represented as exhaust emissions of PM2.5. Estimation of Construction DPM Emissions Construction DPM emissions were estimated using CalEEMod, Version 2016.3.2, as described under the discussion for Impact 3(b). As presented in Table 3, the proposed project's construction is anticipated to occur from September 2021 through March 2023. Construction emissions were assumed to be distributed over the project area.