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Sulfate Trend Analysis

Spring	No. of samples	Period of record median (mg/L)	1995 to 1999 median (mg/L)	2000 to 2005 median (mg/L)	Median Test	Sen's Slope (mg/L per year)	Seasonal Kendall trend
Alexander Springs	41	65.4	65.8	67.6	no change	0.12	stable
Apopka Spring	42	10.0	9.1	9.8	increasing insignificant	0.16	increasing - insignificant
Beecher Springs	11	11.7	11.7	11.1	no change	–0.22	stable
Blue Spring (Lake)	11	9.2	8.7	10.9	increasing - insignificant	–0.53	stable
Blue Spring (Volusia)	25	54.0	53.0	51.4	no change	0.57	increasing - insignificant
Bugg Spring Run	29	8.9	6.8	9.2	increasing - insignificant	0.24	increasing - insignificant
Double Run Spring	16	18.8	17.1	19.4	no change	–0.12	stable
Fern Hammock Springs	42	6.5	6.6	8.0	no change	0.19	increasing - insignificant
Forest Springs	13	83.0	82.4	85.2	no change	–0.16	stable
Gemini Springs	34	120.2	124.5	120.5	no change	–1.06	decreasing
Green Springs	24	100.5	120.6	100.2	no change	2.84	stable
Juniper Springs	43	6.0	6.0	5.6	decreasing	–0.08	decreasing
Miami Springs	37	10.5	9.1	11.0	increasing - insignificant	0.40	increasing - insignificant
Mud Spring	14	39.2	38.8	39.4	no change	–0.03	stable
Palm Springs (Seminole)	36	23.3	23.2	24.0	increasing - insignificant	0.40	increasing - insignificant
Ponce de Leon Springs	43	26.7	29.0	31.2	no change	0.50	stable
Rock Springs	86	18.0	19.0	18.0	decreasing	0.00	stable
Salt Springs	47	404.9	411.6	410.0	no change	2.74	stable
Sanlando Springs	37	12.0	12.0	12.1	no change	0.00	stable
Satsuma Spring	14	261.5	268.0	228.4	decreasing	–7.47	decreasing
Silver Springs	20	42.0	34.0	42.0	no change	1.225	stable
Silver Glen Springs	43	179.4	182.1	171.0	decreasing	–2.29	decreasing
Starbuck Spring	37	24.6	23.6	25.5	increasing - insignificant	0.32	increasing - insignificant
Sweetwater Springs	42	255.8	261.7	240.0	decreasing	–4.06	decreasing
Wekiwa Springs	47	18.0	19.0	19.0	no change	0.02	stable