Surface Water Class D Ch. 15
Repeat samples for a positive coliform sample are required to be collected within
24 hours
Water systems avoiding filtration of source water must show that the turbidity has not exceeded ______ of the samples analyzed in the previous 6 months
5.0 NTU in 90%
The time from sample collection to initiation of the fecal coliform analysis may not exceed
8 hours
Tier II
A tier violation requires the water system to notify its customers as soon as possible, but within 30 days of learning of the violation and continue quarterly notifications as long as the violation persists
Utilities collecting samples more frequently than annually for _______ at each compliance sample point
Running annual average
Lab analysis of pH, turbidity, temperature and residual disinfectant concentrations must be performed by a person approved by the
State
Either the ____ or ____ certifies water treatment plant laboratories for the measurement of total coliforms, fecal coliforms and heterotrophic plate counts
USEPA & State Agency
What is the maximum contaminant level for Bromate?
0.010 mg/L
Solder or flux is consider lead free if it does not contain more than
0.02% lead
A water system is considered public if it has at least ____ service connections or serves _____ or more person ____ or more days each year
15, 25, 60
Samples analyzed for total coliforms by the total coliform Fermentation Technique must be kept below ___ degrees Celsius during transit.
10 degrees
Tier I
Any violation of the National Primary Drinking Water Regulations that pose an immediate risk to public health requires immediate notification of the water system's customers. The notification must be made within 24 hours of learning of the violation.
What may be present when color gives the water an unappealing appearance and indicates that this may be present?
Dissolved Organics
What can states do under the safe drinking water act?
Individual states can establish and enforce their own drinking water standards as long as standards are as stringent as the US EPA's national standards.
What elements in the water supply can discolor laundry, cause a bad taste in the water and cause taste problems in beverages such as coffee and tea?
Iron and Manganese
Systems using diatomaceous earth filtration are required to have turbidity levels ______ of the measurements collected each month.
Less then or each too 1.0 ntu in 95%
How much NTU turbidity units in at least 95% of measurements taken each month?
Less then or equal to 0.3
What is the best available technology for removing radium-226 % radium-228 from a water supply?
Lime Softening
Tier III
Require the public water system to notify its customers within 12 months of learning of the violation. This may be accomplished by including the violation in the Customer Confidence Report.