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6. <br /> CANCER RISKS <br /> The cancer risks from DPM occur exclusively through the inhalation pathway;therefore the <br /> ` cancer risks can be estimated from the following equation: <br /> CRDPM -CDPM *URFDPM * LEA <br /> V <br /> where, <br /> v, CRDPM Cancer risk from DPM; the probability of an individual developing cancer as <br /> a result of exposure to DPM. <br /> CDPM Annual average DPM concentration inµg/m3. <br /> URFDPM Unit risk factor for DPM; estimated probability that a person will contract <br /> 6' cancer as a result of inhalation of a DPM concentration of 1 µg/m3 <br /> continuously over a period pf 70 years. <br /> LEA Lifetime exposure adjustment; values range from 0.14 to 1.0. <br /> v <br /> The inhalation unit risk factor for diesel particulate was established by CARB as 300 in one <br /> million per continuous exposure of I µg/m3 of DPM over a 70-year period. In order to protect <br /> public health,and in accordance with the recommendations of the State of California Office of <br /> Environmental Health Hazard Assessment(OEHHA),a 70-year lifetime exposure is assumed for <br /> receptor locations. The LEA for most residential or sensitive receptors is 1.0. However, <br /> exposure adjustments can be made based on the exposure duration(ex., schools and industrial <br /> workers). <br /> NON-CANCER RISKS <br /> The relationship for the non-cancer health effects of DPM is given by the following equation: <br /> HIDPM-CDPM/RELDPM <br /> Lwhere, <br /> HIDPM Hazard Index; an expression of the potential for non-cancer health effects. <br /> i <br /> v <br /> CDPM Annual average DPM concentration(µg/m3). <br /> L RELDPM Reference exposure level(REL)for DPM; the DPM concentration at which <br /> no adverse health effects are anticipated. <br /> L The chronic REL for DPM was established by OEHHA as 5 pg/m'. <br /> 6. <br /> I9 <br /> v <br />