Appendix C	Air Quality and Health Risk		Table C-36										

SAN JOAQUIN - Stockton - Hazelton Street - Annual Average Concentrations and Health Risks													
TAC	Conc.*/ Risk**	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001
Acetaldehyde	Annual Avg	1.47	1.75	1.07	1.31	1.1		0.9	0.9	1	1.07	0.64	0.59
	Health Risk	7	9	5	6	5		4	4	5	5	3	3
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
	Health Risk	186	181	127		113	97	60	48	64	60	54	42
"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
	Health Risk	126	121	82		106	94	77	68	77	68	58	49
Carbon Tetrachloride	Annual Avg	0.131	0.136				0.099	0.077		0.115		0.098	0.087
	Health Risk	35	36				26	20		30		26	23
Chromium (Hexavalent)	Annual Avg			0.22	0.25	0.25		0.14			0.1	0.12	
	Health Risk			33	37	37		21			15	18	
para-Dichlorobenzene	Annual Avg		0.1	0.1		0.1	0.11	0.1	0.11			0.11	0.13
	Health Risk		7	7		7	7	7	7			7	9
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
	Health Risk	13	14	9	10	12		17	16	17	20	12	11
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
	Health Risk	2	2	2		2	3	2	2	2	2	2	0.9
Perchloroethylene	Annual Avg	0.129	0.113	0.12		0.066	0.061	0.068	0.09	0.033		0.108	0.053
	Health Risk	5	5	5		3	2	3	4	1		4	2
Diesel PM	Annual Avg	No Monitoring Data Available											
	Health Risk												
Total Health Risk		374	375	270	53	285	229	211	149	196	170	184	139.9

*    Concentrations for Chromium (Hexavalent) are expressed as ng/m3 and concentrations for Diesel PM are expressed as ug/m3.  Concentrations for all other TACs are expressed as parts per billion.													
**   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.