CO Water Operator case studies
CO Water Operator · Put your knowledge to work in context.
The Colorado Water Operator credential is a state-issued certification for people who operate drinking water treatment, drinking water distribution, wastewater treatment, and wastewater collection systems. Operators earn certification by level, and higher-level certificates correspond to greater responsibility for process control, compliance sampling, and system supervision. The CO Water Operator case studies are 5 cases and about 4,126 words.
1Alum Overdose After a Storm Knocks Out Alkalinity
A 6 MGD conventional surface water plant draws from a mountain reservoir. On Monday a thunderstorm drops 1.5 in of rain and the raw water changes overnight: turbidity goes from 4 to 85 NTU, alkalinity drops from 45 to 26 mg/L as CaCO3, pH is 6.9, and color rises sharply.
825 words, about 4 min2Nitrification in a Dead-End Chloraminated Main
A mountain community of 4,200 people has fed chloramines since 2019. In late August an operator pulls routine samples from the far end of a 4-mile, 12-inch dead-end main serving a hospital loop.
817 words, about 4 min3Winter Nitrification Failure: Alkalinity or Sludge Age?
A 1.2 MGD extended-aeration activated sludge plant serves a mountain town. In February: influent flow 1.0 MGD, influent TKN 36 mg/L, influent alkalinity 155 mg/L as CaCO3, influent pH 7.2.
809 words, about 4 min4Snowmelt I/I, a Tripped Pump, and a Discharge to the Creek
In the second week of March, rapid snowmelt (60°F days over frozen ground) plus 1.2 in of rain hits a 1970s subdivision served by 8-inch vitrified clay pipe and a duplex submersible lift station rated 450 gpm. Dry-weather flow is 180 gpm.
825 words, about 4 min5A 2 a.m. Asbestos-Cement Main Break and the Pressure Question
At 2:10 a.m., a 12-inch asbestos-cement water main installed in 1978 fails under a state highway shoulder. The crew isolates the break between valves by 2:50 a.m., but pressure on the affected branch - about 45 service connections including a 24-hour convenience store and a small clinic - drops to roughly 12 psi for about two and a half hours.
850 words, about 4 min