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	Annual Toxics Summary Stockton-Hazelton Street FAQs Methyl Chloroform parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		0.005	0.005	*	0.005	0.005	0.000	18	0.01
2020		0.005	*	*	*	0.005	0.000	7	0.01
2019		0.005	0.005	0.005	0.005	0.005	0.000	29	0.01
2018		0.005	0.005	0.005	0.005	0.005	0.000	30	0.01
2017		0.005	0.005	0.005	0.005	0.005	0.000	28	0.01
2016		0.005	0.005	0.011	0.03	0.08	0.015	31	0.01
2015		0.005	0.005	0.005	0.005	0.01	0.002	30	0.01
2014		0.005	0.005	0.006	0.005	0.01	0.001	30	0.01
2013		0.005	0.005	0.005	0.005	0.005	0.000	30	0.01
2012		0.005	0.005	0.005	0.005	0.01	0.001	30	0.01
2011		0.005	0.005	0.006	0.005	0.01	0.002	30	0.01
2010		0.005	0.005	0.007	0.01	0.01	0.003	30	0.01
2009		0.005	0.01	0.009	0.01	0.01	0.002	31	0.01
2008		0.01	0.01	0.012	0.02	0.03	0.005	31	0.01
2007		0.01	0.01	0.014	0.02	0.03	0.006	30	0.01
2006		0.02	0.02	0.020	0.02	0.02	0.000	30	0.01
2005		0.02	0.02	0.020	0.02	0.02	0.000	31	0.01
2004		0.02	0.03	0.027	0.03	0.05	0.007	30	0.01
2003		0.03	0.03	0.031	0.04	0.04	0.003	30	0.01
2002		0.03	0.04	0.038	0.04	0.05	0.005	28	0.01
2001		0.03	0.04	0.039	0.05	0.06	0.007	31	0.01
2000		0.04	0.05	0.063	0.10	0.11	0.021	31	0.01
1999		0.05	0.05	*	0.08	0.09	0.014	16	0.01
1998		0.03	0.05	*	0.07	0.12	0.019	26	0.01
1997		0.05	0.08	0.125	0.14	1.1	0.234	28	0.01
1996		0.07	0.09	0.190	0.25	1.5	0.284	31	0.01
1995		0.10	0.17	0.414	0.54	5.5	1.00	30	0.01
1994		0.05	0.16	0.267	0.36	2.7	0.465	31	0.01
1993		0.14	0.32	*	0.68	1.1	0.224	33	0.01
1992		0.37	0.56	0.665	1.03	2.7	0.443	28	0.01
1991		0.32	0.92	1.04	1.6	2.7	0.500	29	0.01
1990		0.18	0.54	0.845	0.90	15	2.65	30	0.01
1989		0.17	0.54	*	0.87	1.1	0.253	20	0.01

	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.