CA Water Operator case studies
CA Water Operator · Put your knowledge to work in context.
The California Drinking Water Operator Certification Program is administered by the State Water Resources Control Board's Division of Drinking Water. Certification is the state mechanism for recognizing that an individual has demonstrated the knowledge and ability to operate a public water system - treating water, protecting it in the distribution system, and keeping it in compliance with drinking water standards. The CA Water Operator case studies are 5 cases and about 4,290 words.
1Two Wells, One Nitrate Problem
Your system serves 4,200 connections from two wells that blend into a single entry point. Well A (1.2 MGD firm capacity) has climbed from 5.8 to 9.6 mg/L nitrate as N over 18 months; a 180-home subdivision on septic systems was built upgradient.
806 words, about 4 min2Storm Upset at the Conventional Plant
Your 8.0 MGD conventional plant (alum, rapid mix, flocculation, settling, six dual-media filters) has run clean all spring: raw turbidity 2 NTU, settled 1.2 NTU, combined filter effluent 0.08 NTU, filter runs 60 hours. Then 3 inches of rain fall in four hours.
878 words, about 4 min3CT Compliance Versus DBP Headroom
Your 6.0 MGD surface water plant disinfects with free chlorine added at the clearwell inlet. The clearwell holds 400,000 gallons and tracer testing gives a baffling factor of 0.30.
835 words, about 4 min4Main Break on the Arterial
a 6-inch cast iron main shears under a four-lane arterial in front of a strip mall. The crew isolates 1,400 feet of main, and 14 businesses - including a car wash with submerged wash-bay inlets and a dental office - lose pressure for seven hours while the break is repaired.
936 words, about 5 min5Two Coliform Positives in July
You operate a community system that collects 60 routine coliform samples per month. In July the routine sample at site 12, a restaurant on a dead-end main, comes back total-coliform positive with E.
835 words, about 4 min