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Caption: The graph shows average, minimum, and maximum surface un-ionized ammonia measured in Stemple Creek, and its estuary Estero de San Antonio, during 1988-1990. Sampling occurred generally monthly for at least one station, with the number of measurements at each station ranging from 6 to 22 samples for the monitoring period. Note that Stations S-2 through S-6 are estuarine. The reference value represents the maximum North Coast Regional Water Quality Control Board (NCRWQCB) Stemple Creek TMDL threshold (0.025 mg/L) to be met by 2004 whenever and wherever the aquatic habitat is suitable for salmonid migration, rearing, and spawning in the watershed (Salisbury, 1997). This monitoring was part of a water quality study of Americano and Stemple Creeks by Merritt Smith Consulting for the City of Santa Rosa and U.S. Army Corps of Engineers. See Picture for a map of the sampling locations and Info Links for more details.
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