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	2006	2007
Acetaldehyde	Annual Avg	1.94	1.84	1.38	1.73	1.29	0.54	1.28	1.19	1.3	1.56	1.09	1.15	1.24	1.34	1.14	1.42	1.33	1.15
	Health Risk	9	9	7	8	6	3	6	6	6	8	5	6	6	7	6	7	6	6
Benzene	Annual Avg	2.45	2.11	1.36	1.32	1.33	1.16	0.73	0.71	0.76	0.69	0.63	0.538	0.552	0.463	0.372	0.374	0.362	0.318
	Health Risk	227	196	126	122	123	107	68	66	71	64	58	50	51	43	34	35	34	29
"1,3-Butadiene"	Annual Avg	0.409	0.36	0.236	0.339	0.323	0.264	0.222	0.195	0.233	0.177	0.158	0.15	0.146	0.095	0.08	0.082	0.069	0.065
	Health Risk	154	135	89	127	121	99	83	73	88	67	59	56	55	36	30	31	26	24
Carbon Tetrachloride	Annual Avg	0.128	0.129		0.109		0.098	0.077		0.114		0.096	0.086	0.091	0.097				
	Health Risk	34	34		29		26	20		30		25	23	24	26				
"Chromium, Hexavalent"	Annual Avg			0.23	0.21	0.19	0.28	0.13	0.11	0.1	0.1	0.12		0.086	0.078	0.083	0.076	0.05	0.083
	Health Risk			34	31	29	42	20	16	15	15	18		13	12	13	11	8	12
para-Dichlorobenzene	Annual Avg		0.11	0.11	0.13	0.11	0.11	0.1	0.13			0.11	0.13	0.15	0.15	0.15	0.15	0.15	
	Health Risk		7	7	9	7	8	7	9			7	9	10	10	10	10	10	
Formaldehyde	Annual Avg	2.45	1.81	1.46	1.67	1.8	2.1	2.96	2.77	2.86	3.44	2.61	3.08	3.13	3.02	2.27	2.52	2.78	2.51
	Health Risk	18	13	11	12	13	15	22	20	21	25	19	23	23	22	17	19	20	18
Methylene Chloride	Annual Avg	0.76	0.59	0.55	0.76	0.59	0.61	0.54	0.53	0.52	0.5	0.53	0.27	0.16	0.14	0.11	0.12	0.11	0.1
	Health Risk	3	2	2	3	2	2	2	2	2	2	2	<1	<1	<1	<1	<1	<1	<1
Perchloroethylene	Annual Avg	0.126	0.133	0.104	0.473	0.067	0.068	0.068	0.056	0.039		0.076	0.052	0.039	0.033	0.027	0.032	0.032	0.026
	Health Risk	5	5	4	19	3	3	3	2	2		3	2	2	1	1	1	1	1
Diesel PM3	Annual Avg	(2.6)					(1.7)					(1.3)							
	Health Risk	(780)					(510)					(390)							
Average Basin Risk	w/o Diesel PM	450	401	280	360	304	305	231	194	235	181	196	169	184	157	111	114	105	90
	w/ Diesel PM	(1230)					(815)					(586)							




San Joaquin Valley