Appendix C	Alameda County: Fremont - Chapel Way Air Quality and Health Risk													Table C-27			

Annual Average Concentrations and Health Risks																	
TAC	Conc.1/Risk2	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005
Acetaldehyde	Annual Avg	1.28	1.6	1.02	1.28	1.23	0.35	0.88	0.65	0.72	 	 	 	 	0.69	0.69	0.71
	Health Risk	6	8	5	6	6	2	4	3	4	 	 	 	 	3	3	3
Benzene	Annual Avg	1.92	1.67	1.21	1.35	1.25	1.24	0.58	 	0.76	0.61	0.53	0.439	0.418	0.356	0.286	 
	Health Risk	178	155	112	125	116	115	54	 	71	57	49	41	39	33	26	 
"1,3-Butadiene"	Annual Avg	0.283	0.259	0.193	0.321	0.252	0.27	0.199	 	0.238	0.176	0.136	0.132	0.116	0.078	0.049	 
	Health Risk	106	97	72	120	95	101	75	 	90	66	51	50	43	29	19	 
Carbon Tetrachloride	Annual Avg	0.131	0.127	 	0.105	 	0.101	0.076	 	 	 	0.095	0.085	0.089	0.096	 	 
	Health Risk	35	34	 	28	 	27	20	 	 	 	25	23	24	25	 	 
"Chromium, Hexavalent"	Annual Avg	 	 	0.2	0.19	0.21	0.2	0.11	 	0.1	0.1	0.1	 	 	0.045	0.053	0.05
	Health Risk	 	 	30	28	32	30	16	 	15	15	16	 	 	7	8	8
para-Dichlorobenzene	Annual Avg	 	 	0.11	0.11	0.1	0.12	0.1	 	 	 	0.1	0.13	0.15	0.16	0.15	 
	Health Risk	 	 	7	7	7	8	7	 	 	 	7	9	10	11	10	 
Formaldehyde	Annual Avg	1.84	1.98	1.3	1.37	1.78	2.02	2.16	1.79	1.96	 	 	 	 	2.15	1.46	1.21
	Health Risk	14	15	10	10	13	15	16	13	14	 	 	 	 	16	11	9
Methylene Chloride	Annual Avg	0.76	0.58	0.52	0.83	0.5	0.62	0.5	 	 	 	0.5	0.28	0.23	0.3	0.1	 
	Health Risk	3	2	2	3	2	2	2	 	 	 	2	1	 <1	1	 <1	 
Perchloroethylene	Annual Avg	0.189	0.21	0.134	0.114	0.086	0.118	0.069	 	 	 	0.083	0.056	0.05	0.039	0.029	 
	Health Risk	8	8	5	5	3	5	3	 	 	 	3	2	2	2	1	 
Diesel PM	Annual Avg	No Monitoring Data Available															
	Health Risk																
Total Health Risk		350	319	243	332	274	305	197	16	194	138	153	126	118	127	78	20
																	
"1  Concentrations for Hexavalent Chromium are expressed as ng/m3, and concentrations for Diesel PM are expressed as ug/m3.  Concentrations for all other TACs are expressed as ppb."																	
2  Health Risk represents the number of excess cancer cases per million people based on a lifetime (70-year) exposure to the annual average concentration.  Total Health Risk represents only those compounds listed in																	
this table and only those with data for that year.  There may be other significant compounds for which monitoring and/or health risk information are not available.