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19 Cards in this Set
- Front
- Back
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First draw samples for the analysis of lead and copper water must be collected from the taps where the water has stood motionless in the plumbing for at least? |
6 hours |
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Samples to be tested for coliforms are collected in plastic bottles that must contain? |
Sodium thiosulfate |
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The volume of a sample for coliform compliance is? |
100 mL |
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If a water sample is not analyzed immediately for chlorine residual, it is acceptable if it is analyzed Within? |
15 minutes |
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Which may be substituted for the analysis of residual disinfectant concentration, when total coliforms are also sampled at the same sampling point? |
Heterotrophic plate count (HPC) |
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Which water quality parameters requires a grab sample because it cannot be collected as a composite sample? |
pH |
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One chemical characteristic of an acid is that it will? |
Accept an electron-pair |
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Which chemical contains Calcium? |
Lime |
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The best choice to collect a water sample from a customer's faucet in regards to a complaint would be a? |
Faucet without threads |
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When measuring for free chlorine residual, which method is the quickest and simplest? |
Dpd color parameter |
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Water that is to be analyzed for inorganic metals should be a acidified with? |
Concentrated nitric acid |
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If a public water system does not continuously monitor turbidity, how often must it collect a grab sample to measure turbidity from the system's filtered water? |
Every 4 hours |
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If a water system uses chlorine for disinfection, but does not provide filtration, which daily parameters following each point of disinfection are required for determining CT calculations? |
Lowest value for chlorine residual and contact time , lowest temperature, and highest pH |
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A water system exceeds the lead Action level if the concentration in more than 10% of tap water samples collected during any monitoring. Conducted is greater than? |
0.015 mg/L |
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A water system can reduce its monitoring of total organic carbon if it itches which of the following? |
TOC < 2.0 mg/L for 2 years or < 1.0 mg/L for 1 year |
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Under the lid and copper rule of the Safe Drinking Water Act , how is the 90th percentile of lead determined for a water system serving fewer than 100 people if the system collects only 5 samples per monitoring period? |
By taking the average of the highest and the second highest concentrations |
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A water system that uses chlorine dioxide may reduce the sampling frequency in the distribution system from one three-sample set per month to ______ after one year of monitoring where no individual chlorite sample collected in the distribution system exceeded the chlorite mcl? |
One three-sample set per quarter |
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If a water system collects at least 40 samples per month for the analyses of total coliforms, what percent of total coliform positive samples are acceptable for the system to remain in compliance with the maximum containment level for total coliforms? |
No more than 5% |
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If a water system changes its disinfection sampling point, disinfection type, process, or any other modification identified by the state, it must? |
Develop a disinfection benchmark |
