Sulfate Trend Analysis

Spring	No. of Samples	Period	Mann- Kendall p-Statistic	Sen’s Slope (mg/L per year)	Mann-Kendall Trend
Alexander Springs	118	1956–2010	0.00706	0.197	increasing – insignificant
Apopka Spring	118	1972–2010	0.00232	0.105	increasing – insignificant
Beecher Springs	15	1960–2001	0.31004	-0.152	stable
Blue Spring (Lake)	16	1972–2004	0.00236	0.256	increasing – insignificant
Blue Spring (Volusia)	99	1960–2010	0.71078	0.063	stable
Bugg Spring	55	1967–2010	0.00639	0.168	increasing – insignificant
Croaker Hole Spring	30	1981–2010	0.01944	-0.780	decreasing – insignificant
Double Run Spring	16	1998–2005	0.90154	-0.073	stable
Fern Hammock Springs	97	1972–2010	0.70646	0.002	stable
Gemini Springs	58	1972–2010	0.39867	-0.299	stable
Green Springs	45	1972–2010	0.66142	0.772	stable
Green Cove Spring	45	1956–2010	0.00029	-0.102	decreasing – insignificant
Holiday Springs	14	1972–2004	0.00938	0.258	increasing – insignificant
Island Spring	29	1982–2010	0.46551	3.943	stable
Juniper Springs	123	1956–2010	0.01543	-0.053	decreasing – insignificant
Miami Springs	61	1960–2010	3.87E-06	0.425	increasing – insignificant
Orange Spring	41	1972–2010	0.58295	-0.038	stable
Palm Springs (Seminole)	61	1956–2010	2.81E-07	0.322	increasing – insignificant
Ponce de Leon Springs	112	1956–2010	0.00019	0.330	increasing – insignificant
Rock Springs	138	1956–2010	0.14447	0.021	stable
Salt Springs	109	1956–2010	0.55596	0.214	stable
Sanlando Springs	62	1960–2010	0.00412	0.099	increasing – insignificant
Silver Springs	83	1956–2010	0.07633	-0.131	decreasing – insignificant
Silver Glen Springs	97	1972–2010	0.00974	-0.700	decreasing – insignificant
Starbuck Spring	63	1944–2010	2.34E-05	0.239	increasing – insignificant
Sweetwater Springs	78	1980–2010	0.00011	-1.620	decreasing – insignificant
Wadesboro Spring	6	1960–2002	0.06029	0.371	increasing – insignificant
Wekiwa Springs	139	1956–2010	1.13E-11	0.206	increasing – insignificant