Twua Class D Flashcards

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Questions and Answers

What is the name of the State Agency responsible for enforcing the Safe Drinking Water Program in Texas?

Texas Section of EPA

Texas Water Resource and Conservation Commission

Texas Department of Water Resources

Texas Commission on Environmental Quality (formally known as TNRCC) (correct)

Texas Water Development Board

What minerals are associated with water hardness?

Carbon and Nitrogen

Chlorine and Manganese

Chlorine and Hydrogen

Calcium and Magnesium (correct)

Sulfates and Chlorides

A public water system MUST at all times provide -

Adequate quantity of water

Adequate water pressure

Adequate Disinfection

All of the Above (correct)

Only a & c

A source of Groundwater would be -

Aquifer Signup and view all the answers

Fecal Coliform organisms sometimes found in water supplies are an indication that -

All the above Signup and view all the answers

A common chemical used in the disinfection of a small water supply is -

Sodium Benzene Signup and view all the answers

A public water supply system should maintain a system residual pressure of 20 psi and a minimum normal operating pressure of -

35 psi Signup and view all the answers

A disease that may be spread by inadequately disinfected water is -

Dysentery Signup and view all the answers

The amount of Chlorine in mg/L that is used up by reacting with iron, organics, or bacteria is called?

Dosage Signup and view all the answers

The MOST important treatment in water is?

Organic Removal Signup and view all the answers

Which of the following would be considered a part(s) of a hypo-chlorinator system?

150 lb. Cylinder Signup and view all the answers

According to state requirements, all public water supply wells shall be provided with a raised concrete sealing block, screened vents and -

Air gauge for verifying drawdown Signup and view all the answers

One method to determine the drawdown of a water well is -

An amplified sounding unit Signup and view all the answers

The pH of water indicates -

How much fluoride is naturally occurring in the water Signup and view all the answers

Assuming you collect more than one bacteriological sample monthly and your system receives notification from the lab that one of the samples taken in the distribution system comes back positive - your repeat sample(s) must be taken within _____ hours (excluding weekends) and a total of repeat samples must be collected for each positive?

72 hours & 3 repeat samples for each positive Signup and view all the answers

Water that is considered neutral is expressed on the pH scale at -

0.7 Signup and view all the answers

Which of the following is a required step in collecting a routine distribution sample for bacteriological testing?

Fill the sample container to at least 50% of capacity Signup and view all the answers

Potable water means the water is -

All the above Signup and view all the answers

Should a public water supply systems distribution system drop below 20 psi what is required of the operator?

Notify the Regional TCEQ Office and Issue a 'Boil Water Notice' Signup and view all the answers

Before a new or repaired water line is placed into service, it must be properly disinfected by providing a chlorine dosage of _______ and proper detention time.

50 mg/L Signup and view all the answers

In a groundwater system if the operator knows the 'standing' water level in the well when the pump is off and he/she knows the water level in the well during 'pumping' - he/she will be able to determine the __ of the well.

Pump Size Signup and view all the answers

TCEQ requires community water systems to have a minimum production capacity of _________ per connection at peak demand.

0.6 gpm Signup and view all the answers

The mesh size is an important feature of a well screen because properly sized openings should -

Eliminate over pumping Signup and view all the answers

Which of the following is an acceptable disinfection residual at the far reaches of the distribution system?

0.5 mg/L free chlorine residual for a groundwater supply Signup and view all the answers

Study Notes

Texas Drinking Water Agencies and Standards

Texas Commission on Environmental Quality (TCEQ) oversees enforcement of the Safe Drinking Water Program in Texas.
TCEQ was formerly known as TNRCC (Texas Natural Resource Conservation Commission).

Water Hardness

Water hardness is primarily caused by Calcium and Magnesium minerals.

Public Water System Requirements

A public water supply must maintain:
- Adequate quantity of water
- Adequate water pressure
- Adequate disinfection

Groundwater Sources

An Aquifer is a primary source of groundwater.

Fecal Coliform Significance

Fecal coliform organisms indicate contamination and potential presence of harmful bacteria in water, marking it unsuitable for drinking.

Water Disinfection Chemicals

Common chemical for small water supply disinfection: Calcium Hypochlorite.

Water Supply Pressure Standards

A public water supply system should have a residual pressure of 20 psi with a minimum normal operating pressure of 35 psi.

Diseases from Contaminated Water

Diseases such as Dysentery, when inadequately disinfected water is consumed, can pose significant health risks.

Chlorine Demand in Water Treatment

Chlorine demand refers to the amount of chlorine consumed by reactions with impurities present in water.

Key Water Treatment Process

The most critical treatment for water safety is disinfection.

Hypochlorinator System Components

Essential components may include a solution feed pump and a rotameter, but specifics vary.

Public Water Supply Well Requirements

Wells must have a concrete sealing block, screened vents, and may require additional safety devices.

Determining Water Well Drawdown

Water well drawdown can be measured by monitoring discharge pressure and timing pump cycles.

pH Level Importance

pH measures the acidity or alkalinity of water, which is crucial for determining its quality for consumption.

Bacteriological Testing Procedures

Routine sampling requires approved containers and strict adherence to sample collection best practices to ensure accuracy.

Definition of Potable Water

Potable water must be free of pathogens, maintain adequate pressure, and possess a chlorine residual for safety.

Operator Responsibilities Under Low Pressure

If pressure drops below 20 psi, operators must address the cause immediately and notify relevant authorities.

Water Line Disinfection Standards

Before service initiation, new or repaired water lines must undergo disinfection with a minimum chlorine dosage of 20 mg/L.

Well Water Level Measurements

Knowing static and pumping water levels assists in calculating well performance, including drawdown and flow rates.

Community Water Production Capacity

TCEQ mandates community systems to maintain a minimum production capacity of 0.4 gallons per minute per connection during peak demand.

Well Screen Mesh Size Importance

Proper mesh size is vital to reduce sand pumping and enhance the effectiveness of well screens.

Disinfection Residual Levels

Acceptable disinfection residuals in a distribution system include:
- 0.2 mg/L free chlorine
- 0.5 mg/L chloramine for surface water
- 0.8 mg/L chloramine under specific treatment
- 0.5 mg/L free chlorine for groundwater systems.

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Description

Test your knowledge on the Texas Safe Drinking Water Program and its enforcement agency. This quiz features essential flashcard questions that will help you prepare for class assessments. Discover which agency is key in maintaining water quality in Texas.