WWT 180 Wastewater Collection

WWT 180 Wastewater Collection Assignment #4: Underground Repair

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 I. 6th Edition. Sacramento, California: California State University Department of Civil Engineering, 2003 (ISBN 1-884701-43-4).

Chapter Chapter 7, “Underground Repair”

Study Questions

1. Describe typical causes of damage and stoppages that necessitate collection system repair. 2. What should a crew leader do before starting a repair job? 3. What types of equipment might be used to make an excavation during sewer construction? (Note: Section 7.202 Trench Shoring, will be covered in another course, WTECH 183 Utility Worker Safety)

4. Explain what control points are and how they are used during sewer construction. 5. Explain how each of the following construction controls are used. a. String line b. Batter board c. Fixed-beam laser 6. How do Class A-1 and Class B bedding for rigid sewer pipe differ? Which would provide more support for sewer pipe? 7. Why is backfill material and initial compaction important when installing flexible pipe? 8. Describe each of the following types of bedding material. a. Granular b. Native 9. Describe how each of the following types of pipe should be placed into a trench. a. Small-diameter pipe (up to 10-inch diameter) b. Large-diameter pipe (12-inch and above) 10. Describe the basic installation method for joining pipe with resilient joints. 11. How should pipe bedding be completed once pipe has been placed into a trench and joints are complete? 12. Describe how a manhole is constructed. 13. Describe how a cleanout is constructed. 14. Describe each of the following types of backfill material. a. Native b. Imported 15. Describe each of the following methods of backfill compaction. a. Water compaction b. Mechanical compaction 16. A crew for which you are field supervisor has been given a work order to install a cleanout on an existing residential service line. Describe steps your crew would take from the time they arrive at a work site until they leave. 17. Describe how air testing is conducted on a section of new sewer pipe between two manholes. 18. Describe how water testing is conducted on a section of new sewer pipe between two manholes. 19. When is a mandrel test used? What does it determine? 20. A crew for which you are field supervisor has been given a work order to replace a section of main line located in a residential street. Describe the steps your crew would take to accomplish the repair from the time they receive the work order until the paving is restored. 21. What problems might be caused by the settling of backfill in an excavation being spanned? 22. What type of pipe material should be used when sewer lines cross the excavations or trenches of other utilities? 23. What type of bedding should be used for sewers spanning excavations? 24. Why are sewers grouted or chemically sealed? 25. Describe how a leaky joint in an 8-inch sewer would be sealed. 26. Describe clean up procedures used after a sealing operation. 27. A manhole requires the addition of a three-inch concrete spacer to make it level with the street. Describe the steps you would take to make this repair. 28. Describe how you would install a cement bottom with a channel in a manhole currently without a concrete bottom.