AgdaPkt 2017-09-11 Closed and Joint SA PFA

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TA. - Page 57 LSA ASSOCIATES, INC. ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT SEPTEMBER 2016 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION Stationary Sources. The BAAQMD issues permits to businesses whose operation includes the release of TACs. These operations are known as stationary air pollution sources and should be considered for their exposure when locating sensitive receptors in a new location. In order to identify stationary sources for a particular location,the BAAQMD provides KML(Google Earth) files for each county within the BAAQMD jurisdiction. Using the KML file for San Mateo County and a 1,000-foot buffer zone, five stationary sources, shown in Table 3,were identified. Results of the stationary source analysis indicate that all sources in the project vicinity would be below the established significance criteria established by the BAAQMD,for both adult staff members and students,at the single source level. According to the BAAQMD,a significant cumulative TAC impact would occur if the project,in combination with other projects located within a 1,000-foot radius of the project site,would expose sensitive receptors to TACs resulting in an increased cancer risk greater than 100 in one million,an increased cancer risk of greater than 10 on the hazard index(chronic),or an ambient PM2.5 increase greater than 0.8 gg/m3 on an annual average basis. As shown in Table 3,the cumulative contribution of all TAC sources,which includes stationary and roadway sources,would not exceed the thresholds established by the BAAQMD. Table 3: Stationary and Roadway Sources within 1,000 feet of the Project Site Adjusted Adjusted Adult Distance Student/Child Risk PM'.' Source(Name&Address feet Risk in a million in a million Hazard /m3 Beacon Gas Station—1101 Broadway 750 0.11 0.25 0.018 0.0 Free-Flow Packing—1050 Broadway 520 N/A N/A N/A N/A Expert Woodworking—924 Broadway 600 0.00 0.00 0.001 0.0 Valley Market and Gas—2303 Spring 300 0.71 1.65 0.029 0.0 US Bank—2225 Spring Street(generator) 750 0.60 1.4 0.007 0.036 Tyco Thermal Controls—2501 Bay Road 600 0.0 0.0 0.0 4.83E-04 Quality Auto Body—2566 Bay Road 1,000 0.22 0.528 0.003 0.005 State Route 84 750 0.22 0.528 0.007 0.027 US 101 1,300 1.33 3.11 0.003 0.005 Single Source Threshold 10 in 1 million 10 in 1 million 1.0 0.3 Exceeds Single Source Thresholds No No No No Cumulative Sources 3.22 7.7 0.068 0.04 Cumulative Sources Threshold 100 in 1 million 100 in 1 million 10.0 0.8 Exceeds Cumulative Threshold No No No No Source: BAAQMD and LSA Associates,2015. Indoor Air Quality. The existing property owner has installed a soil vapor recovery system (also referred to as a passive sub-slab depressurization system,as described in Chapter I,Project Description)designed to interrupt the potential exposure pathway of volatilization of contaminants to indoor air. The existing property owner,project sponsor,and DTSC recently developed a Work Plan to test the effectiveness of the system. The Work Plan includes a monitoring and reporting component that will be overseen by DTSC to ensure the effectiveness of the system. Indoor air sampling will include four events to be completed by February 2017 (approximately seven months prior to the proposed opening of the school in the Fall of 2017),with semi-annual monitoring thereafter. Results will be reviewed by the DTSC to ensure that screening levels are met. If screening levels are not met, the DTSC will require that the system be converted to active status and indoor air resampled to P:1RWC1401B Rocketship Sch-I\PRODUCrSUS-MND1Public\Ra ketship Public Review 09-29-16.docx(09/29/16)PUBLIC REVIEW DRAFT 33 ATTY/RESO.0084/CC RESO ADOPTING CEQA-ROCKETSHIP CHARTER SCHOOL APPEAL REV:09-05-17 VR Page 41 of 124