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4.Minor Revisions to the Draft Environmental Impact Report r Impact 4.6.4: Project DPM Health Risk Impact. Implementation of the project may lead to �— increases in chronic exposure at nearby sensitive receptors to certain toxic air contaminants from operation of the combination of stationary and mobile sources. This impact is potentially significant. Health risks associated with air emissions consist of the following: diesel particulate matter (DPM)from on-site equipment, DPM from haul trucks;toxic air contaminants(TACs) from �- asphalt plant operations, and crystalline silica from fugitive dust.All four sources were analvzed using HARP(Hot Pot Analysis and Report Program)version 1.3 and AERMOD version 07026 to develop the Health Risk Assessment(HRA). L The HRA was completed using meteorological data from Fresno. Based on a review of meteorological data from other locations(Modesto, Stockton, and Sacramento) and CARB's California Surface Wind Chmatolo¢y, it was determined that the Fresno data set is representative of the area surrounding the project site. This data set from Fresno provides complete and recent `r data for the location. Table 4 6 6A provides the cumulative HRA results for the production alternatives and haul route options Notably,the cancer risks are dominated by diesel particulate matter(DPM) emissions ` from haul trucks and onsite equipment, the chronic health impacts are dominated by crystalline silica,and the acute health impacts are dominated by hydrogen sulfide Table 4 6 6B provides a ` breakdown of the HRA results by source category for the 4 million production level. The table also shows the receptor location of the maximum impact. Table 4.6.6C presents a listingof f the receptors.Notably,the totals within Table 4.6.613 do not add to the total within Table 4.6.6A la, because the impacts occur at different receptors. As shown in Table 4.4.6A and 4.4.6B,the results show that cancer risks and the acute/chronic health impacts would be below the significance thresholds: • Increase in cancer risk of 10 in 1 million i,. •Hazard Index greater than one (1.0) for acute or chronic health impacts TABLE 4.6.6A REVISED HEALTH RISK ASSESSMENT RESULTS r Production Acute Health Level Haul Route Option Cancer Risk Chronic Health Index Index 4M Route 1 5.41 0.28 0.37 Route 3 7.76 0.28 0.37 2.85M Route 1 4.93 0.25 0.37 r Route 3 7.05 0.25 0.37 1.7M Route 1 4.45 0.23 0.37 Route 3 6.34 0.23 0.37 r Cancer risks are due to 70 year exposure duration with a source contribution based on 245 days per year and 8 hours per day of operations during the project duration. Chronic impacts are based on 245 days per year and 8 hours per day of operations during a maximum annual concentration. Acute impacts based on 24 hours per day of operations. t� L Cemex Vernam Cuarry Mining and Reclamation Project 4A9 ESA/203015 Final Environmental Impact Report June 2008 L