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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Methyl Chloroform parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		0.005	0.005	*	0.005	0.01	0.001	12	0.01
2011		0.005	0.005	0.024	0.01	0.61	0.110	30	0.01
2010		0.005	0.01	0.008	0.01	0.02	0.003	30	0.01
2009		0.005	0.01	0.010	0.01	0.02	0.004	31	0.01
2008		0.005	0.01	0.013	0.02	0.04	0.007	31	0.01
2007		0.01	0.02	0.017	0.02	0.02	0.004	29	0.01
2006		0.01	0.02	0.020	0.02	0.02	0.002	30	0.01
2005		0.02	0.02	0.021	0.02	0.04	0.004	31	0.01
2004		0.02	0.03	0.026	0.03	0.03	0.005	30	0.01
2003		0.03	0.03	0.034	0.04	0.04	0.005	31	0.01
2002		0.03	0.04	0.041	0.04	0.07	0.006	30	0.01
2001		0.03	0.04	0.043	0.05	0.07	0.008	31	0.01
2000		0.04	0.05	*	0.10	0.14	0.028	24	0.01
1999		0.05	0.05	*	0.06	0.06	0.005	11	0.01
1998		0.03	0.04	*	0.06	0.09	0.014	26	0.01
1997		0.05	0.08	*	0.22	0.71	0.150	28	0.01
1996		0.06	0.08	0.090	0.12	0.18	0.028	31	0.01
1995		0.08	0.13	0.181	0.21	1.1	0.192	30	0.01
1994		0.05	0.11	0.232	0.27	1.5	0.325	31	0.01
1993		0.12	0.18	0.203	0.28	0.42	0.067	30	0.01
1992		0.02	0.27	*	0.44	0.65	0.139	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.