Application for Contact Hour Training CertificateSlow Sand Filtration Training

First and Last Name*

Certification Number

What is your Oregon Operator Certificaiton Number?

Email Address*

This is where your completion letter will be sent to.

Phone Number*

Phone

Course Title*

Slow Sand Filtration

When did you complete the course*

Part 1: June 5, 2024 9:00am-Noon (3 contact hours)

Part 2: June 6, 2024 9:00am-Noon (3 contact hours)

Quiz

There are 10 quiz questions.

You must get a 70% or better (answer at least 7 our of the 10 questions correctly) to pass the quiz and receive your contact hours.

1. Which of the following are pathogen/contaminant removal mechanisms in slow sand filters?*

2. What are key slow sand filter media specifications when specifying filter sand?*

Effective Size

Uniformity Coefficient

NSF-61 Certification

All of the Above

3. If ½-inch of sand is removed with each scraping and a slow sand filter with 36-inches of sand is scraped twice a year, in approximately how many years will the filter need to be re-sanded if the goal is to keep a minimum of 24-inches of sand in the filter.*

6 years

9 years

12 years

15 years

4. What is the difference between wet harrowing and scraping when cleaning slow sand filters?*

Scraping removes some of the filter sand each time

Harrowing is done while the water level is above the filter sand while cleaning

Harrowing can be done using a harrowing rake

Scraping can be done with a flat blade shovel

All of the above

5. If a surface water filtration plant met disinfection requirements, which of the following statements would have to be true?*

Entry point chlorine residual is < 0.2 mg/l

Actual CT > Required CT

Clearwell volume is at its maximum level

Entry point chlorine residual is > 0.2 mg/l

Actual CT > Required CT AND Entry point chlorine residual is > 0.2 mg/l

6. Where would you locate a flow meter to be able to record peak hour demand for reporting to DWS?*

At the inlet to the treatment plant

At the individual filter effluent

At the combined filter effluent

At the effluent of the CT segment

At or prior to the first user

At the effluent of the CT segment AND At or prior to the first user

7. What equation would you use to calculate Actual CT?*

Peak hour demand x chlorine residual

Contact time x baffling factor x chlorine residual

Chlorine residual x contact time

None of the above

8. How is contact time required to be determined for surface water systems?*

Contact volume x estimated baffling factor

Pipe volume divided by flow rate if CT segment is all in a pipe

By conducting a tracer study if CT segment includes a reservoir or tank

By calculating CT Pipe volume divided by flow rate if CT segment is all in a pipe OR By conducting a tracer study if CT segment includes a reservoir or tank

9. What should you do if you exceed a regulatory turbidity limit?*

10. What website would you go to download forms for monthly reporting of turbidity and CT?*

www.healthoregon.org/swt

www.healthoregon.org/training

www.healthoregon.org/info

None of the above

I certify

I have completed the training and exam to the best of my ability
I did not accept help from anyone, and the answers are my own.
I understand that I will receive a completion email with my exam score from forms@app.smartsheet.com and may need to check my spam/junk folder to find it.
I understand that if I get less than 70%, that I will need to complete a new application for Contact Hour Training Certificate form and re-take the quiz.

Signature*

Type your first and last name here