WWT 180 Wastewater Collection Assignment #5: Lift Stations

Instructions Read the chapter specified in the text listed below, then answer the Study Questions. You will maximize your learning if you answer the Study Questions in your own words.

Submit your answers to the Study Questions according to these guidelines:

 save your assignment as a Microsoft Word document;  format your assignment with no spaces between lines and with 1 inch margins on all sides;  use normal style (no bold, italic or underline, please) Times New Roman (PC) font size 12 or Times (Mac) font size 12;  place the course number, the title of the assignment and your full name at the beginning of your assignment;  list Study Question answers by number (it's not necessary to re-write the Study Questions themselves);  submit the assignment as an e-mail attachment to the instructor at [email protected] by the due date/time listed in the course schedule;  make it clear in your e-mail subject line which course and assignment number you are submitting (for example, your e-mail subject line might read: WWT 180 Reading Assignment #1); and  submit each assignment with a separate e-mail (only one assignment per e-mail, please!).

Evaluation In order to be accepted for evaluation, this assignment must be submitted by the due date/time listed in the course schedule and in the format outlined in the instructions section above. The instructor will randomly select study questions from this assignment for evaluation. Study questions will be evaluated based on the following criteria:

2 points Response correctly answers the question, is factually correct; and is thorough. Response demonstrates comprehension of material and understanding of concepts 2 points by using student's own words. Response demonstrates good writing skills including appropriate use of standard 1 point English with attention to mechanics, grammar, punctuation and usage.

Text Operation and Maintenance of Wastewater Collection Systems, Volume II. 6th Edition. Sacramento, California: California State University Department of Civil Engineering,

Chapter Chapter 8, “Lift Stations”

Study Questions

1. What is the purpose of a lift station? 2. Where are lift stations located? 3. Describe the ideal result or overall goal of lift station operation. 4. What are the advantages and limitations of a wet well being too large or too small? 5. What are advantages and limitations of having bar racks in wet wells? 6. How is the depth of water in a wet well measured? 7. Why should isolation valves in lift stations be plug valves instead of gate valves? 8. Why must lift stations have adequate ventilation? 9. What action should be taken if a lift station has failed and the wastewater upstream of it is rising rapidly? 10. How is the frequency of lift station visits determined? 11. Discuss the advantages and limitations of daily versus weekly visits to lift stations. 12. What should be inspected during a lift station visit? 13. What types of written materials should be kept at a lift station? Why? 14. What safety precautions would you take BEFORE attempting to determine the cause of a lift station failure? 15. What kinds of problems or failures can occur in lift stations? 16. How would you develop a maintenance schedule for a lift station? 17. Why should a maintenance schedule be reviewed from time to time? 18. Why are lift station costs important? 19. What types of written reports should be prepared for lift stations? Why?