Water Collection Grade II
What does "LEL" mean on a gas detection meter? a) Lower electrical limit b) Lower explosive limit c) Lower evaporation limit d) Lower equipment limit
b) Lower explosive limit
What tool would you use to cut VCP pipe? a) Hammer b) Grinder c) Chain pipe cutter d) Chisel
c) Chain pipe cutter
The interior of 300 feet of 12-inches pipe is uniformly coated with one inch of grease. How many gallons will this pipe hold when filled with water? a) 1,230 gallons b) 1,360 gallons c) 1,470 gallons d) 1,630 gallons
a) 1,230 gallons (.785 x (10/12ft)^2 x 300 ft x 7.48 gal/ft^3)= 1,230 gallons
If it takes 7 minutes and 30 seconds for dye to travel a distance of 860 feet through an eight inch sewer, what is the velocity in fps? a) 1.91 fps b) 0.76 fps c) 1.02 fps d) 2.43 fps
a) 1.91 fps (860 feet/ 450 sec)= 1.91 fps
Flow estimation is critical to reporting SSOs. You are dispatched to an SSO coming out of a 24-inch manhole pick hole that was spurting about 3/4 inch, the sewerage was running down the gutter into a storm drain 200' away. You received the call at 11:00 hrs, arrived on site at 11:15, and your crew relieved the stoppage at 1127. You estimate the spill was running at 6 gallons per minute (6 gpm). How much sewer went un-captured into the storm drain? a) 162 gallons b) 126 gallons c) 719 gallons d) 1,211 gallons
a) 162 gallons (27 mins x 6gal/min)= 162 gallons
Minimum design velocity for a sewer should be greater than: a) 2 Feet per second b) 3 Feet per second c) 3.5 Feet per second d) 4 Feet per second
a) 2 Feet per second
For a nighttime Short Term Stationary Temporary Traffic Control Zone setup on low speed/low volume street, the minimum height of the traffic cones used shall be? a) 28" H b) 24" H c) 18" H d) 32" H
a) 28" H
Infiltration is caused by: a) Cracked pipes b) Improper closed circuit TV operation c) Poor ventilation d) Roof drains connected to the sewer
a) Cracked pipes
How can the members of a balling crew communicate with each other? a) Hand signals b) Shouting down the sewer c) Telegraph d) Writing
a) Hand signals
Hydraulic sewer cleaning methods include: a) High velocity cleaners b) Bucket machines c) Power rodders d) Hand rods
a) High velocity cleaners
Tools used for sewer rodding include all but the: a) Lag screw b) Porcupine c) Root saw d) Square bar cork screw
a) Lag Screw
Why are wear rings installed in a pump? a) To concentrate wear on rings instead of volute and impeller b) To concentrate wear on rings instead of sleeves c) To concentrate wear on rings instead of bearing d) To concentrate wear on rings instead of shaft
a) To concentrate wear on rings instead of volute and impeller
The lack of an unpleasant odor in a manhole, lift station or other structures does not always mean that dangerous gases are not present because: a. Some dangerous gases have no odor. b. Dangerous gases have only pleasant odors. c. Some gases heighten the sense of smell. d. All gases have an odor.
a. Some dangerous gases have no odor.
Why are gasoline and volatile solvents objectionable when present in a sewer? a. They produce an explosion hazard b. They tend to cause the solids to vaporize c. They will coagulate floatables and cause stoppages d. Because they float, these substances flow to the headworks quicker
a. They produce an explosion hazard
A flow of 650 gpm would be how many mgd? a) 0.472 mgd b) 0.936 mgd c) 1.714 mgd d) 1.923 mgd
b) 0.936 mgd (650 gal/min)x(1440min/day)/10^6=0.936 mgd
Temporary traffic control lanes created as part of a Temporary Traffic Control Zone setup on a street with a 35 MPH maximum speed limit shall be a minimum width of? a) 8 ft b) 10 ft c) 11 ft d) 12 ft
b) 10 ft
Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within: a) 24 Hours b) 2 Hours c) 2 Days d) 2 Weeks
b) 2 Hours
What is the total volume of 1,000 feet 8-inches line? a) 2,201 gallons b) 2,611 gallons c) 3,916 gallons d) 4,217 gallons
b) 2,611 gallons (.785x(8/12)ft^2x1,000ft x7.48gal)=2,611 gallons
Based on new Best Practices of the Common Ground Alliance for marking underground Utilities, the Inquiry Identification Number for an Underground Service Alert (USA) is viable for: a) 21 days b) 28 days c) 14 days d) 30 days
b) 28 days
An upright circular cylinder tank (flat bottom) has a diameter of 12 feet. When filled to a depth of 8 feet, the volume is? a) 226.2 cubic feet b) 904.3 cubic feet c) 3,619 cubic feet d) 5,000 cubic feet
b) 904.3 cubic feet (.785 x 12ft x12ft x 8ft)= 904.3 cubic feet
Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by: a) A decrease in velocity allowing gases to be released from the wastewater b) A decrease in velocity allowing organic and inorganic solids to settle out c) A decrease in velocity which increases the treatment time of the inorganic solids d) An increase in velocity which decrease the treatment time in the lines
b) A decrease in velocity allowing organic and inorganic solids to settle out
What would cause a pump to deliver less than its expected rate discharge? a) Check valves are open b) Clogged impeller c) Discharge head too low d) Pump in primed
b) Clogged impeller
How often must an excavation site and adjacent areas be inspected for hazardous conditions? a) Hourly b) Daily c) Weekly d) Monthly
b) Daily
Lift station failure can include: a) Dip tube failures b) Electrical circuit failures c) Invert siphon failure d) Drip line failures
b) Electrical circuit failures
What control types are used to start or stop pumps? a) Dissolved air b) Floats c) Valves d) Rotors
b) Floats
Emergency stoppages in pipelines may be cleared safely by use of: a) Balling b) High Velocity cleaners c) Bucket machines d) Kites
b) High Velocity cleaners
The main reason for adding sodium hypochlorite to sewers is to control: a) BOD b) Odor c) Pathogens d) Suspended solids
b) Odor
Vitrified clay pipe is what type of pipe? a) Soft b) Rigid c) Flexible d) Weak
b) Rigid
Rodents and insects can be controlled by: a) Aeration b) Spraying manholes with an approved pesticide c) Vacuum filtration d) Flooding
b) Spraying manholes with an approved pesticide
To report in the Statewide SSO Data-base California Integrated Water Quality System (CIWQS), regarding the location of a Category 2 SSO, you must know: a) The GIS coordinates b) The GPS coordinates c) The nearest cross streets d) The nearest stream or creek
b) The GPS coordinates
Protective shoring systems options include all but: a) Proper stopping or benching of the sides of the excavation b) Working in an un-sloped trench with no shoring c) Supporting the sides of a trench with no shoring d) Using a shield in the excavation area
b) Working in an un-sloped trench with no shoring
What items would you consider when selecting a solution to clear a stoppage in a sewer? a. Adding solution to the upstream manhole to clear stoppage b. Cause of stoppage c. Time of day d. Staffing requirements
b. Cause of stoppage
Why should hydrogen sulfide be controlled: a. Not to protect operators. b. To protect sewers and structures from corrosion. c. To promote odors. d. To promote corrosion of sewers and structures.
b. To protect sewers and structures from corrosion.
According to the State Water Resources Control Board Order No. 2006-003-DWQ, each Enrollee must develop and implement a system-specific: a) (SSMP) Sanitary Sewer Maintenance Program b) (SSMP) Sanitary Sewer Management Plan c) (SSMP) Sewer System Management Plan d) (SSMP) Security System Maintenance Plan
c) (SSMP) Sewer System Management Plan
The oxygen level alarm in a gas detection meter is normally set to go off at oxygen levels below: a) 21.5% b) 20.5% c) 19.5% d) 18.5%
c) 19.5%
A wet well 20 feet in diameter is filled with water to a depth of 10 feet. How many gallons does the tank contain? a) 2,355 gallons b) 3,140 gallons c) 23,500 gallons d) 31,400 gallons
c) 23,500 gallons (.785 x 20 feet x 20 feet x 10 feet x 7.48 gallons)= 23,500 gallons
you received a dispatch at 4:30 PM informing you that raw sewage is spewing out of a manhole onto the ground and into a small stream adjacent to a sparsely populated neighborhood. The caller reporting the problem indicated that it had been spilling sewer since 2 PM and that she had noticed it while driving by on the 405 freeway stuck in stop and go traffic. She indicated that she was not able to call right away and report the spill because of the restrictions on using a cell phone when driving a motor vehicle. You immediately dispatch a hydro-vac crew to the site to assist you in taking care of the problem. Upon arrival at the manhole at 5:15 PM, you notice right away that sewage is spilling out from around an unsecured 24-inch bolt down manhole cover. You field measure the height of the sewage from the top of the frame on the manhole casting and determine that the sewage is reaching an elevation 5 inches above a manhole rim with the cover still in place tabulates out to 166 gallons per minute. You also notice that the SSO is flowing from the manhole directly down a steep bank and into a waterway. No pooling of sewage is noted between the manhole and the creek. As the creek was flowing rather high that afternoon after an earlier rainstorm, none of the spill would be recoverable. Your crew had setup their equipment and were able to clear the problem causing the mainline stoppage 22 minutes after your arrival. Based on the information supplied, how many reportable unrecoverable gallons of raw sewage had reached the creek. a) 30,622 gallons b) 11,122 gallons c) 36,022 gallons d) 32,370 gallons
c) 36,022 gallons Spilled @ (2:00pm) Arrived and completed (5:37 pm -2:00 pm)= 3hrs 37 min 3hr= 180 mins + 37 mins = 217 mins x 166 (gal/min) = 36,022 gallons
"High priority subsurface installations are high pressure natural gas pipelines with normal operating pressures greater than 415 kPA gauge (60 p.s.i.g.), petroleum pipelines, pressurized sewage pipelines, conductors or cables that have a potential to ground of 60,000 volts or more, or hazardous materials pipelines that are potentially hazardous to employees, or the public, if damaged". This paragraph indicates that before the start date of the excavation the following should occur: a) A phone call b) An e-mail c) An agreed upon site visit d) Nothing
c) An agreed upon site visit
The goal of preventative maintenance is to? a) Avoid doing maintenance b) Satisfy the city council c) Avoid breakdowns, severe damage, or harmful depreciation d) Use the entire budget
c) Avoid breakdowns, severe damage, or harmful depreciation
Before starting a maintenance operation in a basement located in backyard of a residence you should: a) Have the police order the resident to allow you access b) Just skip the maintenance operation c) Contact the resident and politely ask permission to enter the backyard d) Just enter the backyard and ignore the resident
c) Contact the resident and politely ask permission to enter the backyard
Proper operation and maintenance of wastewater collection is: a) Allowing stoppages to occur b) Allowing SSO to occur c) Keeping wastewater flowing through pipes d) Collecting fees from public
c) Keeping wastewater flowing through pipes
Which item is a critical task in operation and maintenance of wastewater collection? a) Allowing stoppages to occur b) Allowing SSO to occur c) Keeping wastewater flowing through pipes d) Collecting fees from the public
c) Keeping wastewater flowing through pipes
What document would you require to be referenced when developing an S.O.P. for hazardous substance spill cleanup as well as spill containment? a) The A.E.D. Log b) The D.O.T. Policy c) M.S.D.S. d) The Confined Space Entry Permit
c) M.S.D.S.
A hazard that may damage a TV camera going through a sewer is: a) Camera above the flow b) Clean optical lens c) Offset joints d) Using in a new line
c) Offset joints
Roots can enter collection systems through: a) Air gaps b) Manhole covers c) Pipe cracks d) Well maintained lift stations
c) Pipe cracks
A person who completes a training program in accordance with the requirements of Title 8, California Code of Regulations, Minimum Guidelines of the Common Ground Alliance is considered: a) Competent Person b) Concerned Person c) Qualified Person d) The Excavator
c) Qualified Person
Why must you always know where a cleaning tool is in a sewer? a) So the tool can find its way back b) So you can locate it when resuming work after an interruption c) So you know where obstructions or difficulties are encountered d) It is not important to know where the tool is as long as it gets to the end of the sewer
c) So you know where obstructions or difficulties are encountered.
What tools are used with a power rodder? a) Finger grips b) Pruning shears c) Spring blades d) Videostape camera
c) Spring blades
What type of pump is used in lift station wet wells? a) Piston b) Screw c) Submersible d) Ejector
c) Submersible
One of the advantages of using CCTV is: a) Ability to see what's happening when camera is underwater b) To record television shows c) That the length and severity of defective pipe areas can be recorded d) Visitors are impressed
c) That the length and severity of defective pipe areas can be recorded
When developing an S.O.P for scheduled maintenance of electrical equipment, what program should be addressed as a primary safety guideline? a) The S.S.M.P b) The I.I.P.P c) The L.O.T.O. Program d) The cross connection prevention program
c) The L.O.T.O. Program
The gas most commonly associated with septic wastewater is: a. Carbon dioxide. b. Carbon monoxide c. Hydrogen sulfide. d. Methane
c. Hydrogen sulfide.
What does "transition area" mean in traffic control? a. Provides protection for traffic and workers b. Lets traffic resume normal driving path c. Moves traffic out of its normal path d. Tells traffic what to expect ahead
c. Moves traffic out of its normal path
Four conditions are necessary to create an explosion. Three of these conditions are combustible gas, adequate oxygen and sufficient heat. What is the fourth? a. Constant supply of combustible gas b. Enclosed area that will hold the gases c. Proper mixing of gas and oxygen d. Constant ventilation
c. Proper mixing of gas and oxygen
Which of the following best describes one component of a Traffic Control Zone: a. Curb Face. b. Underground Service Alert. c. Transition Area. d. Rest Area Location
c. Transition Area.
If an eight-inch force main has a metered flow rate of 400,000 gpd, what is the velocity? a) 0.42 fps b) 0.96 fps c) 1.18 fps d) 1.77 fps
d) 1.77 fps (400,000gal/day=(.62ft^3/sec)/(.785x(8/12)^2))=1.77 fps
Once enrolled in CIWQS, the "Collection System Questionnaire" must be updated at least every: a) 2 years b) 6 months c) 18 months d) 12 months
d) 12 months
During the 24-hours operation, a lift station pumped 3,000 gallons per minute for a community of 27,000. What is the per capita pumped in gallons per day? a) 100 b) 110 c) 120 d) 160
d) 160 (3,000gpm x 1440 min/day)/ 27,000= 160
How many types of common shoring are there? a) 4 b) 7 c) 9 d) 6
d) 6
What elements should be considered to improve worker safety in High Speed Temporary Traffic Control Zones? a) Rerouting Traffic around the work site b) Positioning of Law Enforcement Officers in the Temporary Traffic Control Zone c) Work Zone Training d) All of the above
d) All of the above
What key factors would you need to address when developing an S.O.P. for a Lift Station failure? a) Traffic Control Plan b) By-Pass connections c) Spill Containment d) All of the above
d) All of the above
Manholes include all the following except: a) Barrels b) Lids c) Cones d) Backflow devices
d) Backflow devices
In developing an S.O.P. for air monitoring in a Permit Required Confined Space you would include which of the following? a) Placement of the Blower b) Weather forecast c) P.P.E. d) Both a and C
d) Both a and C
When a citizen wants information regarding a maintenance operation you should? a) Always refer them to a supervisor b) Ignore them c) Tell them you are not authorized to give out information d) Give them as much factual information as you can, and offer to help them further.
d) Give them as much factual information as you can, and offer to help them further.
Which conditions should a gas detection device test for? a) Hydrogen sulfide, oxygen, helium b) Explosive/flammable gases, helium, oxygen c) Oxygen, hydrogen sulfide, helium d) Hydrogen sulfide, explosive/flammable gases, oxygen
d) Hydrogen sulfide, explosive/flammable gases, oxygen
Sources of excessive clean water in a collection system include: a) A problem at the wastewater treatment plant b) A Water distribution main construction project c) Evaporation d) Infiltration from a high water table
d) Infiltration from a high water table
The lowest point on the inside of a pipeline is called the: a) Center Line b) Haunch c) Channel d) Invert
d) Invert
After completing a Temporary Traffic Control setup for your work zone it is a good practice to: a) Take a 10 minutes rest period so you can eat your breakfast b) Leave the job site to go get a cup of coffee at Starbuck's c) Immediately get to work on your project d) Observe how effective you TTC setup is working to control traffic and make the necessary changes to it if necessary.
d) Observe how effective you TTC setup is working to control traffic and make the necessary changes to it if necessary.
Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause: a) Concrete and metal shine b) Enriched Oxygen in the air in manholes, sewers and wet wells c) Non-Toxic gas production d) Odors
d) Odors
Maintenance programs are based on? a) A history of emergencies b) Seasonal requirements c) A good filing system d) Preventative and corrective maintenance principles
d) Preventative and corrective maintenance principles
Sewer testing methods do not include: a) Air b) Water c) Mandrill d) Sewage
d) Sewage
Centrifugal pump parts include: a) Diaphragm b) Piston c) Rotor d) Volute
d) Volute
Personnel entering a Permit Required Confined Space must have the following training: a. Traffic control. b. Rescue and data entry. c. Pipe materials. d. Entry and rescue procedures.
d. Entry and rescue procedures.
How many different areas of traffic zones are there when working in roadways? a. Seven b. Two c. Four d. Five
d. Five
Sources of excessive clear water in a collection system include: a. A problem at the wastewater treatment plant. b. An interceptor sewer leak. c. Exfiltration from a high water table. d. Infiltration from a high water table
d. Infiltration from a high water table
To find proper protective gear before application of a product, you would: a. Never read the product label. b. Never ask a co-worker. c. Ask someone off the street. d. Look at the MSDS.
d. Look at the MSDS.
You should never attempts to install, troubleshoot, maintain, repair or replace electrical equipment panels, controls, wiring or circuits unless: a. A manhole is overflowing down a street. b. A pump is plugged. c. You are receiving lots of odor complaints. d. You know what you are doing, are qualified, and are authorized.
d. You know what you are doing, are qualified, and are authorized.