3_Exhibit B - Laserfiche WebLink

1/6 Ramboll 2200 Powell Street Suite 700 Emeryville, CA 94608 USA T +1 510 655 7400 F +1 510 655 9517 www.ramboll.com MEMO Date: December 15, 2022 To: Cecily Barclay, Perkins Coie LLP Marie Cooper, Perkins Coie LLP From: Michael Keinath, PE Ivy Tao, PhD Subject: HEALTH RISK ASSESSMENT FOR THE PROPOSED RESIDENTIAL RECEPTORS AT THE STONERIDGE MALL RESIDENTIAL PROJECT, PLEANSANTON, CALIFORNIA Ramboll US Consulting, Inc. (Ramboll) conducted a health risk assessment (HRA) on the future residents at the proposed 2022 Stoneridge Mall Residential Project in Pleasanton, California (the “Project”). The Project is located in the area previously analyzed in the City of Pleasanton’s 2012 Housing Element Supplemental Environmental Impact Report (SEIR) and would provide new housing consistent to the 2012 Housing Element. The Project’s location in relationship to the land uses in the vicinity is shown in Figure 1. The Project would need to comply with the mitigation measures in the SEIR. The SEIR’S Mitigation Measure (MM) 4.B-4 requires the Project to conduct an HRA to determine the exposure of Project residents to air pollutants emanating from the Project and the surrounding area: Air Quality MM 4.B-4: Reduce Exposure to Toxic Air Contaminants (TACs). On project sites where screening thresholds are exceeded, the following measures shall be implemented for development on all the potential sites for rezoning to reduce exposure to TACs and improve indoor and outdoor air quality: Indoor Air Quality - In accordance with the recommendations of the Bay Area Air Quality Management District (BAAQMD), appropriate measures shall be incorporated into building design in order to reduce the potential health risk due to exposure of sensitive receptors to TACs. Project applicants shall retain a qualified air quality consultant to prepare a health risk assessment (HRA) in accordance with the BAAQMD requirements to determine the exposure of project residents/occupants/users to air pollutants prior to Planning Unit Development (PUD) approval. The HRA shall be submitted to the community Development Department for review and approval. The applicant shall implement the approved HRA mitigation measure recommendations, if any, in order to reduce exposure to TACs below BAAQMDs threshold of significance at the time of project approval. Housing units shall not be sited in any incompatible areas, such as if the HRA finds TAC exposure that cannot be reduced to less than significant, or if required mitigation cannot be feasibly implemented.