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MEMO - T <br /> Environmental <br /> Sciences <br /> sulfide. Table A-2 provides a breakdown of the HRA results by source category for the 4 <br /> million production level. The table also shows the receptor location of the maximum <br /> impact. Table A-3 presents a listing of the receptors. Notably, the totals within Table A-2 <br /> do not add to the total within Table A-1 because the impacts occur at different receptors. <br /> As shown in Table A-1 and A-2, the results show that cancer risks and the acute/chronic <br /> health impacts would be below the significance thresholds: <br /> • Increase in cancer risk of 10 in 1 million <br /> • Hazard Index greater than one (1.0) for acute or chronic health impacts _ <br /> TABLE A-1 <br /> HEALTH RISK ASSESSMENT RESULTS <br /> Production Haul Route Cancer Chronic Health Acute Health <br /> Level Option Risk Index Index <br /> 4M Route 1 5.41 0.28 0.37 <br /> Route 3 7.76 0.28 0.37 - <br /> 2.85M Route 1 4.93 0.25 0.31 <br /> Route 3 7.05 0.25 0.37 <br /> 1.7M Route 1 4.45 0.23 0.37 <br /> Route 3 6.34 0.23 0.37 <br /> Cancer risks are due to 70 year exposure duration with a source contribution based on 245 days <br /> per year and 8 hours per day of operations during the project duration. _ <br /> Chronic impacts are based on 245 days per year and 8 hairs per day of operations diving a <br /> maximum annual concentration. <br /> Acute impacts based on 24 hours per day of operations. <br /> TABLE A-2 <br /> HEALTH RISK ASSESSMENT RESULTS BY SOURCE CATEGORY <br /> Production Cancer Chronic Health Acute Health <br /> Level Source Category Risk Index Index <br /> DPM from Onsite Equipment 4.49(2) 0,06 (2) NA <br /> DPM from Haul Trucks along <br /> 4M Route 1 4.24(4) 0.04(5) NA <br /> DPM from Haul Trucks along <br /> Route 3 6.40(9) 0.04(5) NA - <br /> Aggregate&Fugitive Dust 0.002(3) 0.23 (2) 0.003(3) <br /> Asphalt Plant 0.02(3) 0.005 (5) 0.37(2) <br /> Values in parenthesis represent receptor ID - <br /> PO Bax 365 Indianola, WA 98342 <br /> T-360.265.8111 F-727.578.5210 <br />