Appendix C	San Joaquin County: Stockton - Hazelton Street Air Quality and Health Risk													Table C-40			

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	1.47	1.75	1.07	1.31	1.1	 	0.9	0.9	1	1.07	0.64	0.59	0.8	0.81	0.87	0.99
	Health Risk	7	9	5	6	5	 	4	4	5	5	3	3	4	4	4	5
Benzene	Annual Avg	2.01	1.95	1.37	 	1.23	1.05	0.64	0.52	0.69	0.65	0.58	0.454	0.521	0.437	0.37	0.358
	Health Risk	186	181	127	 	113	97	60	48	64	60	54	42	48	40	34	33
"1,3-Butadiene"	Annual Avg	0.336	0.321	0.217	 	0.281	0.25	0.206	0.181	0.206	0.18	0.155	0.13	0.146	0.096	0.079	0.085
	Health Risk	126	121	82	 	106	94	77	68	77	68	58	49	55	36	30	32
Carbon Tetrachloride	Annual Avg	0.131	0.136	 	 	 	0.099	0.077	 	0.115	 	0.098	0.087	0.091	0.098	 	
	Health Risk	35	36	 	 	 	26	20	 	30	 	26	23	24	26	 	
"Chromium, Hexavalent"	Annual Avg	 	 	0.22	0.25	0.25	 	0.14	 	 	0.1	0.12	 	0.123	0.13	0.123	0.12
	Health Risk	 	 	33	37	37	 	21	 	 	15	18	 	18	20	18	18
para-Dichlorobenzene	Annual Avg	 	0.1	0.1	 	0.1	0.11	0.1	0.11	 	 	0.11	0.13	0.15	0.15	0.15	0.15
	Health Risk	 	7	7	 	7	7	7	7	 	 	7	9	10	10	10	10
Formaldehyde	Annual Avg	1.81	1.88	1.24	1.38	1.56	 	2.35	2.24	2.33	2.68	1.61	1.48	2.07	1.91	1.79	1.94
	Health Risk	13	14	9	10	12	 	17	16	17	20	12	11	15	14	13	14
Methylene Chloride	Annual Avg	0.63	0.5	0.6	 	0.5	0.75	0.53	0.5	0.5	0.5	0.53	0.27	0.14	0.16	0.12	0.12
	Health Risk	2	2	2	 	2	3	2	2	2	2	2	 <1	 <1	 <1	 <1	 <1
Perchloroethylene	Annual Avg	0.129	0.113	0.12	 	0.066	0.061	0.068	0.09	0.033	 	0.108	0.053	0.035	0.03	0.022	0.024
	Health Risk	5	5	5	 	3	2	3	4	1	 	4	2	1	1	 <1	1
Diesel PM	Annual Avg	No Monitoring Data Available															
	Health Risk																
Total Health Risk		374	375	270	53	285	229	211	149	196	170	184	139	175	151	109	113
																	
"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.