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This layer displays the geometric mean of chloride grab samples (mg/l) collected since 2008. Data were downloaded from the WDNR’s Surface Water Integrated Monitoring System (SWIMS) database on July 17th, 2018. Only samples collected between May 1st and October 31st were used in the calculation to avoid samples that were collected as part of a runoff/snowmelt event-based sampling effort. Any “flagged” sample was removed from the dataset (e.g. holding time exceeded, etc.). Any result that was returned as below detection limit was set to 0.001 mg/l. NR 106.06(4)(e)(3) indicates that samples below detection limit should be set to zero, but a geometric means cannot be calculated with negative values or zeros, so these samples were set to a very small positive number. |