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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Perchloroethylene parts per billion

Read About New Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		0.005	0.005	*	0.01	0.02	0.006	12	0.01	*
2011		0.005	0.005	0.006	0.01	0.02	0.004	30	0.01	0.7
2010		0.005	0.005	0.008	0.01	0.02	0.005	30	0.01	1
2009		0.005	0.005	0.010	0.02	0.05	0.010	31	0.01	1
2008		0.005	0.005	0.010	0.02	0.03	0.008	31	0.01	1
2007		0.005	0.005	0.011	0.02	0.04	0.010	29	0.01	1
2006		0.005	0.005	0.011	0.02	0.04	0.009	30	0.01	1
2005		0.005	0.01	0.028	0.02	0.67	0.119	31	0.01	3
2004		0.005	0.01	0.014	0.03	0.04	0.010	30	0.01	2
2003		0.005	0.01	0.015	0.03	0.03	0.008	31	0.01	2
2002		0.005	0.02	0.024	0.04	0.07	0.015	30	0.01	3
2001		0.005	0.02	0.024	0.05	0.08	0.017	31	0.01	3
2000		0.005	0.02	*	0.07	1.4	0.281	24	0.01	*
1999		0.005	0.02	*	0.03	0.04	0.010	16	0.01	*
1998		0.005	0.01	*	0.03	0.03	0.009	28	0.01	*
1997		0.005	0.02	*	0.10	0.29	0.057	28	0.01	*
1996		0.005	0.03	0.049	0.11	0.26	0.054	31	0.01	6
1995		0.01	0.03	0.047	0.10	0.21	0.051	30	0.01	5
1994		0.005	0.03	0.265	0.11	7.7	1.38	31	0.01	31
1993		0.005	0.04	0.057	0.12	0.19	0.046	30	0.01	7
1992		0.005	0.05	*	0.10	0.12	0.032	16	0.01	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.