AgdaPkt 2012-02-13 - Laserfiche WebLink

Browse Search

8. B. - Page 186 The caticer rislc for a given year is calcL�lated as: Ca��cer Risk =[(Cair x DBR x EF x ED x CF) / AT] x ASF x Cancer Potency Factor Where: Cair = air concentration (µg/nr ) from air dispersion model DBR = daily breafliing rate (L/lcg body weight per day) EF = e�posi�re frequency (350 days/yea�) ED = exposL�re dL�ration (1 year) CF = conversion factor (1.0E-06 [(mg/µg) x (nr /L)]) AT = averaging time (25,550 days or 70 years) Ca�lcer Potency Factor = toxicity factor (mg/lcg-day ASF = 10 for first 2.25 years, 3 for ages 2-15, and 1 for age 16 a�ld beyond For DPM, the Cancer Potency Factor is 1.10E+00 mg.kg-day li7 the ca��cer risk calculations provided u� the conuilentor for Yea� 0-1, the Amli�al Risk (per inillion) is reported as 1.63. lii a�riving at fliis ca�lcer risk a breathulg rate of 581 L/kg-day was L�sed instead of 302 Ukg-day, as indicated ul the te�t preceding the calculations. The calclilation used in the conu7lent is: Ca��cer Risk =[0.0186 µghlr x 581 Ukg-day x 350 days/year x 1 year x 1.0E-06 [(mg/µg) x (nr/L)] / 25,550 days] x 10 x 1.10E+00 Ca�lcer Risk = 1.6 E-6 or 1.63 per nullion For a 70- yea� residential cancer risk, BAAQMD uses a�1 adult breathing rate of 302 L/lcg- day. Had a breathulg rate of 302 Ukg-day been used, as the conunentor implied, the caticer risk would ha�e been 0.85 per nullion each for Year 0-1 a�1d Year 1-2. The ca��cer rislc calculations provided by the cominentor nsed a daily breathing rate of 581 L/kg-day for the first 16 years of the calculations, thereby overestimating the Annual Ca��cer Risk for each of the first 16 years by a factor of 1.92 (581/302). This flawed methodology results in a�� ei7oneous total Cuinl�lative Rislc (per inillion) of 10.26 per nullion. The CumL�lative Ca�lcer Risk (per nullion) for the first 16 yea�s was calculated as 7.60 per million by the commentor's calcL�lations. AdjL�sting fliis by a factor of 1.92 by applying the BAAQNID reconui�ended breathing rate gives a CL�mulative Rislc of 3.96 per million. Using this as the CL�mL�lative Risk for Year 15-16 a�ld assL�n�lg that the reinaulder of the risk calculations for years 16-70 are correct, the total Cumulative Risk would be 6.62 per million. Therefore, based on the coinrnentor's method of calculatu�g total cLUl�i�lative risk, when using BAAQMD's recommended breathulg rate, it demonstrates that the City's method of calculatu7g ca�lcer rislc is appropriate a�id overestimated potential ca��cer risks suice the City's calculated 70 year ca�lcer risk from DPM was 7.59 per nullion. Comment A-14: Concll�sion — Proponents must accL�rate [sic] detail the potential health risks for the proposed project. The result of the a��alysis inL�st be presented in a sL�pplemental EIR. This concludes my cominents. 2580 El Cainino Real Residenrial Project 18 Response to Conmients Recei��ed on Final EIR Cin� of Red��ood Cin� Jannai� 2012