MI Water Operator case studies
MI Water Operator · Put your knowledge to work in context.
Michigan Drinking Water Operator Certification is the state credential that allows an individual to serve as the responsible operator of a public water supply in Michigan. The program sits within the Michigan Department of Environment, Great Lakes, and Energy (EGLE), under the Drinking Water and Environmental Health division, and EGLE maintains separate pages for drinking water operator certification and for training and exams. The MI Water Operator case studies are 5 cases and about 3,909 words.
1Coagulant Overfeed and Filter Breakthrough After a Storm
A 6.0 MGD conventional surface-water plant treats a river source with alum and polymer, flocculation, sedimentation, and four dual-media filters. After a 2-inch rain event, raw turbidity climbed from 4 NTU to 24 NTU in six hours and raw alkalinity fell from 105 to 42 mg/L as CaCO3.
782 words, about 4 min2Coliform Positives and Residual Loss in a Stagnant Distribution System
A community system serving 9,200 people collects 10 routine coliform samples per month. It buys treated surface water at about 1.1 MGD and distributes it through 60 miles of main, three elevated tanks, and a long dead-end loop serving a hospital and a school.
753 words, about 4 min3Nitrate Exceedance, Blending and a Late Confirmation at a Two-Well System
A community system is supplied by two Type I wells in a sand-and-gravel aquifer beneath row crops. Well 1: nitrate 11.4 mg/L as N, 700 gpm capacity, static level 38 ft, pumping level 74 ft, pump set at 110 ft.
822 words, about 4 min4DBP Running Averages, Missing Monitoring and a CCR Deadline
A 3,400-connection community system treats its own surface water and has just completed its fourth quarter of Stage 2 DBP monitoring at the location with the highest TTHM. Quarterly results at that site: TTHM 0.062, 0.081, 0.074 and 0.069 mg/L; HAA5 0.041, 0.048, 0.052 and 0.044 mg/L.
730 words, about 4 min5Pressure Loss at a Main Break: Advisory Decision and a Trench That Is Not Safe
A 12-inch cast iron main under a four-lane arterial fails at 02:15 on a Saturday. The crew isolates it, but the valves hold poorly: pressure in the affected zone - 420 connections including a 90-bed hospital and two restaurants - drops to about 8 psi and stays there roughly four hours before isolation is complete.
822 words, about 4 min