Grafton Lake/Dyken Pond Air Monitoring Site Trends (1987-2006)

Grafton Lakes (Dyken Pond) Acid Deposition Data, 1987 - 2006
Year	Precip. in	pH	[SO4] ippm	[NO3] ippm	[NH4] ippm	SO4 Dep. kg/ha	NO3 Dep. kg/ha	NH4 Dep. kg/ha
87
88	44.55	4.23	2.82	1.69	0.24
89	45.45	4.34	1.97	1.51	0.40	22.73	17.45	4.59
90	53.54	4.37	1.80	1.22	0.27	24.53	16.57	3.72
91	40.86	4.28	2.27	1.46	0.37	23.56	15.13	3.82
92	30.66	4.31	2.12	1.58	0.35	16.51	12.28	2.70
93	35.24	4.33	2.07	1.44	0.37	18.53	12.85	3.33
94	36.98	4.41	2.12	1.31	0.44	19.93	12.32	4.12
95	37.10	4.45	1.54	1.38	0.40	14.50	12.97	3.73
96	49.07	4.50	1.29	1.11	0.31	16.12	13.82	3.88
97	31.22	4.38	1.54	1.31	0.37	12.21	10.35	2.90
98	28.62	4.42	1.77	1.45	0.44	12.84	10.54	3.16
99	48.52	4.53	1.13	1.07	0.22	13.98	13.15	2.70
00	49.96	4.42	1.44	1.40	0.30	18.24	17.70	3.80
01	31.95	4.40	1.31	1.53	0.28	10.65	12.39	2.23
02	51.51	4.54	1.31	1.27	0.23	17.18	16.61	3.06
03	48.99	4.62	1.02	1.17	0.54	12.30	14.14	6.76
04	46.42	4.62	1.35	1.25	0.37	15.97	15.22	4.33
05	55.99	4.77	0.83	1.20	0.42	11.25	16.07	5.29
06	49.54	4.75	1.03	0.76	0.21	13.10	9.74	2.74

Blanks indicate that the rainfall criteria were not satisfied. That is, analysis of at least 75% of the annual and 50% of the quarterly precipitation.