MD Water Operator case studies
MD Water Operator · Put your knowledge to work in context.
The Maryland Water Operator certification is the state credential that authorizes an individual to operate a public drinking water treatment plant or distribution system in Maryland. It is intended for operators, maintenance staff, and utility employees who are responsible for the day-to-day production, treatment, and delivery of safe drinking water, and for candidates working toward a first license or an upgrade in classification. The MD Water Operator case studies are 5 cases and about 2,589 words.
1Filter Effluent Turbidity Rise After Storm Event
A 4.5 MGD conventional surface-water plant treating a reservoir source has just come through a 2.1-inch rain event. Raw water turbidity rose from 3 NTU to 22 NTU and pH fell from 7.8 to 7.2.
587 words, about 3 min2Pressure Loss and Coliform Positive After Main Break
A 6-inch unlined cast-iron main in a commercial district failed at 7:40 a.m. The crew isolated it by 8:10 a.m.; pressure in the affected zone fell to 16 psi for about 2.5 hours and the zone lost chlorine residual (0.05 mg/L at a nearby hydrant).
521 words, about 3 min3Nitrate Trend in a Small Groundwater System
A community groundwater system serves 1,150 people from two wells. Well 2, completed at 62 feet in sandy soil, is surrounded by irrigated corn fields and several septic systems.
492 words, about 2 min4Lead Action Level Exceedance in a Mid-Size System
A community water system with 3,400 connections and 280 known lead service lines has no corrosion control treatment. Finished water pH is 7.1 and alkalinity is 35 mg/L as CaCO3.
507 words, about 3 min5Confined Space Entry in a Valve Vault
A distribution crew is preparing to replace a 12-inch gate valve inside a 10-foot-deep vault at a commercial intersection. The vault has one 24-inch access hatch and no forced ventilation.
482 words, about 2 min