ME Water Operator case studies
ME Water Operator · Put your knowledge to work in context.
The ME Water Operator credential is a Maine drinking-water operator certification, and this page is an independent study resource for candidates preparing for it. Maine's Drinking Water Program, part of the Maine Center for Disease Control & Prevention, administers public water system operator requirements, and its site organizes operator material under Drinking Water Operators, including water sampling and testing, compliance samples, instructions for collecting compliance water samples, public water system operator requirements, and training and professional development. The ME Water Operator case studies are 5 cases and about 3,538 words.
1Storm Turbidity and a Lime Outage at a Conventional Plant
A 12-MGD conventional surface-water plant treats a river source. At 06:00 Monday, raw turbidity is 42 NTU (up from 3 NTU), raw pH 7.0, alkalinity 38 mg/L as CaCO3, and color 35 CU after a 2-inch rain.
706 words, about 4 min2Dead-End Pressure Loss and a Closed Valve
A distribution zone serving 1,850 connections is fed by a booster station through a 12-inch main. SCADA shows station discharge pressure steady at 58 psi, but a logger at a dead-end 2.4 miles away reads 22 psi at 03:00 and 16 psi at 07:00; normal is 45–50 psi.
719 words, about 4 min3Nitrate Exceedance in One Well Before a Weekend
Your community water system (3,250 people, 1,150 connections) has three wells. Friday at 16:20, the contract lab emails that the routine nitrate result from Well 2 is 12.4 mg/L as N; Wells 1 and 3 are 6.1 and 7.8 mg/L.
725 words, about 4 min4Chlorine Cylinder Release on the Night Shift
At 02:10 on a Sunday, the night operator at a 6-MGD surface-water plant hears the chlorine room exhaust fan change pitch and sees the door to the 150-lb cylinder room slightly open. The fixed chlorine detector in the room reads 2.5 ppm and rising; a second detector in the adjacent lab reads 0.4 ppm.
687 words, about 3 min5Main Break, Low Pressure, and a Boil Water Notice
At 09:15, a contractor strikes a 12-inch cast-iron main on a business loop. The break floods a parking lot and undermines pavement.
701 words, about 4 min