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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 198
<br /> Air Quality/Climate Change Analysis
<br /> Appendix C: Modeling Assessment Updates
<br /> Table C-3. Cumulative Health Risk Screening Analysis for Costco Wholesale Redwood City GDF.
<br /> Maximum Maximum
<br /> Cancer Non-cancer
<br /> Risk Chronic Hazard
<br /> Cumulative Component (per million) Index
<br /> Maximum Adjusted Project-level Impacts(Residential) 2.1 0.001
<br /> Stationary Sources Identified by the BAAQMD as Emitting Toxic Air
<br /> Contaminants Within 1,000 Feet of Costco Redwood City GDF:
<br /> • (None Identified) -- --
<br /> Freeways, Highways,and Major Roadways With Annual Average Daily
<br /> Traffic of 10,000 or More Within 1,000 Feet of Costco Redwood City GDF:
<br /> • Woodside Road(36,250 Average Daily Traffic),630 feet west of project 6.4 0.006
<br /> • Middlefield Road(25,800 Average Daily Traffic),510 feet north of project 1.1 --
<br /> Rail Corridors Within 1,000 Feet of Costco Redwood City GDF:
<br /> • Caltrain Passenger Rail Service(No Electrification),300 feet south of project 20.0 0.017
<br /> • Freight Rail Service,300 feet south of project 4.6 0.004
<br /> • Dumbarton Rail Corridor Passenger Rail(Proposed),250 feet south of project 2.2 0.001
<br /> • California High Speed Rail(Proposed-Electrified),300 feet south of project -- --
<br /> Additional Approved or Proposed Projects Emitting Toxic Air Contaminants
<br /> Within 1,000 Feet of Costco Redwood City GDF:
<br /> • City of Redwood City: none Identified -- --
<br /> • County of San Mateo: none Identified -- --
<br /> Total Cumulative Toxic Impacts(Assuming No Caltrain Electrification) 36.5 0.028
<br /> Reduction in Risk Assuming Caltrain Electrification in 2025 -15.0 --
<br /> Bay Area AQMD Cumulative Significance Thresholds 100.0 10.0
<br /> Significant? No No
<br /> Notes:
<br /> 1. The Bay Area AQMD recommends that cumulative health risks associated with toxic air contaminants(TACs)include the following
<br /> sources located within 1,000 feet of a project: sources permitted by the District that emit TACs,high-volume roadways(freeways,
<br /> highways,and major roadways with average daily traffic of 10,000 or more), rail yards,and other projects emitting TACs. Source:
<br /> Bay Area Air Quality Management District,California Environmental QualityAct Air Quality Guidelines,May 2011,Sections 5.2
<br /> (Single Source Impacts)and 5.3(Cumulative Impacts).
<br /> 2. Information on stationary sources emitting TACs within 1,000 feet of the Costco Wholesale Redwood City Gasoline Dispensing Facility
<br /> (GDF)is based on information on permitted TAC sources available from the Bay Area AQMD: Stationary Source Screening Analysis
<br /> Tool,April 29,2011,data for San Mateo County for May 2011,available at www.baaqmd.gov/Divisions/Planning-and-Research/
<br /> CEQA-GUIDELINES/Tools-and-Methodology.aspx(accessed January 20,2012). Based on this data,there are no other District-
<br /> permitted sources of TACs located within 1,000 feet of the Costco Redwood City GDF.
<br /> 3. Based on local road traffic count data from the California Environmental Health Tracking Program,there are only two high volume
<br /> roadways with average daily traffic of 10,000 or more within 1,000 feet of the proposed project: Woodside Road(located 630 feet
<br /> west of the project)and Middlefield Road(located 510 feet north of the project). Source: California Environmental Health Investigations
<br /> Branch, CEHTP Traffic Linkage Service Demonstration,available at www.ehib.org/traffic_tool.jsp(accessed January 20,2012),
<br /> assuming longitude of-122.21782,latitude of 37.47863,and a radius of 304.8 meters(1,000 feet).
<br /> 4. Information on TACs from Woodside Road is from the Bay Area AQMD's Highway Screening Analysis Tool,April 29,2011,data for
<br /> San Mateo County at 6 feet(ground-level breathing zone), Link 119(Woodside Road),at a distance of 100 feet to the west of Woodside
<br /> Road to the peak residential receptor for cumulative health risks(cancer risk of 6.442/million and chronic hazard index of 0.006).
<br /> 5. Information on TACs from Middlefield Road is from the Bay Area AQMD's Roadway Screening Analysis Tables (County Surtace Street
<br /> Screening Tables),April 29,2011,San Mateo County Tables, Lifetime Cancer Risk for East-West Directional Roadway,Annual Average
<br /> Daily Traffic of 30,000,at a distance of 610 feet from the surtace street(cancer risk of 1.14/million at 500 feet).
<br /> 6. See Table C-4 for derivation of cumulative health risk screening level analysis for rail corridors.
<br /> 7. Dumbarton Rail Corridor Passenger Rail Service is identified as a project in the Caltrain 2009-2018 Short Range Transit Plan Capital
<br /> Improvement Program(Short-Range Transit Plan: Fiscal Year2009 through Fiscal Year2018, December 2009,available at
<br /> www.caltrain.com/projectsplans/Plans/Short Range_Transit Plan.html(accessed March 22,2012)],and in the Metropolitan
<br /> Transportation Commission Transportation Plan[Transportation 2035 Plan forthe San Francisco BayArea,April 2009,available at
<br /> www.mtc.ca.gov/planning/2035_plan/(accessed March 22,2012)]. Based on information from the Alameda County Transportation
<br /> Page 4 Date: 7/30/2012
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