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	Annual Toxics Summary Fremont-Chapel Way FAQs Carbon Tetrachloride parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		0.09	0.09	*	0.10	0.10	0.005	16	0.02	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		0.08	*	*	*	0.08	0.000	3	0.02	*
2003		0.08	0.09	0.096	0.11	0.13	0.014	30	0.02	74
2002		0.07	0.09	0.089	0.10	0.10	0.009	28	0.02	68
2001		0.07	0.09	0.085	0.09	0.11	0.009	30	0.02	66
2000		0.08	0.09	0.095	0.12	0.13	0.013	29	0.02	73
1999		0.08	0.08	*	0.12	0.12	0.015	15	0.02	*
1998		0.09	0.11	*	0.14	0.14	0.017	29	0.02	*
1997		0.08	0.10	*	0.11	0.13	0.013	13	0.02	*
1996		0.06	0.08	0.076	0.09	0.09	0.008	31	0.02	58
1995		0.07	0.10	0.101	0.12	0.13	0.011	30	0.02	77
1994		0.06	0.12	*	0.13	0.13	0.018	22	0.02	*
1993		0.08	0.11	0.105	0.13	0.14	0.016	26	0.02	81
1992		0.10	0.12	*	0.13	0.13	0.008	21	0.02	*
1991		0.10	0.13	0.127	0.15	0.17	0.016	28	0.02	98
1990		0.09	0.13	0.131	0.15	0.18	0.019	29	0.02	101
1989		0.09	0.13	0.124	0.14	0.15	0.017	23	0.02	95

	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.