Appendix C	San Joaquin County: Stockton-Hazelton Street Air Quality and Health Risk													Table C-37	

Annual Average Concentrations and Health Risks															
TAC	Conc.*/Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003
Acetaldehyde	Annual Avg	1.47	1.75	1.07	1.31	1.10		0.90	0.90	1.00	1.07	0.64	0.59	0.80	0.81
	Health Risk	7	9	5	6	5		4	4	5	5	3	3	4	4
Benzene	Annual Avg	2.01	1.95	1.37		1.23	1.05	0.64	0.52	0.69	0.65	0.58	0.45	0.52	0.44
	Health Risk	186	181	127		113	97	60	48	64	60	54	42	48	40
"1,3-Butadiene"	Annual Avg	0.34	0.32	0.22		0.28	0.25	0.21	0.18	0.21	0.18	0.16	0.13	0.15	0.10
	Health Risk	126	121	82		106	94	77	68	77	68	58	49	55	36
Carbon Tetrachloride	Annual Avg	0.13	0.14				0.10	0.08		0.12		0.10	0.09	0.09	0.10
	Health Risk	35	36				26	20		30		26	23	24	26
"Chromium, Hexavalent"	Annual Avg			0.22	0.25	0.25		0.14			0.10	0.12		0.12	0.13
	Health Risk			33	37	37		21			15	18		18	20
para-Dichlorobenzene	Annual Avg		0.10	0.10		0.10	0.11	0.10	0.11			0.11	0.13	0.15	0.15
	Health Risk		7	7		7	7	7	7			7	9	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
	Health Risk	13	14	9	10	12		17	16	17	20	12	11	15	14
Methylene Chloride	Annual Avg	0.63	0.50	0.60		0.50	0.75	0.53	0.50	0.50	0.50	0.53	0.27	0.14	0.16
	Health Risk	2	2	2		2	3	2	2	2	2	2	1	1	1
Perchloroethylene	Annual Avg	0.13	0.11	0.12		0.07	0.06	0.07	0.09	0.03		0.11	0.05	0.04	0.03
	Health Risk	5	5	5		3	2	3	4	1		4	2	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	140	176	152

"*    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."															
**  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.