Download CWEA CSM Grade 2 Exam Questions and Answers: Wastewater Collection Systems and more Exams Systems Engineering in PDF only on Docsity!
CWEA CSM GRADE 2 EXAM 2025 - 2026 /REAL 250
QUESTIONS AND ANSWERS|100%
AUTHENTIC|A+GRADE
In order to accurately estimate the flow of a sanitary sewer overflow (SSO) you must have: - ANS:->> Spill start time, spill end time and spill rate Providing a plan and schedule to properly manage, operate and maintain all parts of the sanitary sewer system is the goal of a: - ANS:->> A sewer system management plan (SSMP) What are the basics elements of a safety program? - ANS:->> Safety policy, statement, safety training, accident investigation What factor must be considered when obtaining an easement for construction and maintenance of a collection system? - ANS:->> Access for equipment and personnel As the division manager you receive a request from your board or council, and they want an immediate response. You do not know all the answers you should: - ANS:->> Respond with the information available and update them with more If you were a supervisor of two lead workers, one whose work was exceptionally good and a second whose work was substandard, what should you do? - ANS:->> Discuss the problem with the substandard foreman and offer to help before any other action is taken In selecting pipe material for maximum service life which factor is more important? - ANS:->> Life expectancy of pipe What affects the flow capacity of a sewer line? - ANS:->> Pipe size, pipe, material, grade
When a grade conflict exists between a Water main and a sewer main, which of the following is the best solution? - ANS:->> Have the Water main adjusted and hold the grade on the sewer main Why is the replacement of wastewater collection systems in some downtown streets difficult? - ANS:->> Crowding of other underground utilities. Under what conditions must each member of the rescue service practice permit space rescues? - ANS:->> At least once a year in simulated situation using non- representative space conditions If the camera becomes wedged during a video inspection, which of the following would be your first step in solving the problem? - ANS:->> Attempt to free the camera with the tag line. Drawings which are considered "As Built" would be? - ANS:->> Corrected construction drawings showing changes made in the field installation. Legally Responsible Officials are required to report category 1 sanitary sewer overflows: - ANS:->> Within 2 hrs. Span & Control relates to the number of subordinates who can be supervised effectively by one supervisor. At the top level of organizations, what is this number? - ANS:->> 9 to 11 What is the best approach to take when handling on-the-job conflicts? - ANS:-
Communicate clearly without attacking the other person or personalizing the conflict What tools are used with a power rodder? - ANS:->> Spring blades
injuries to one operator. What do you do first? - ANS:->> Send for help and check and /or restore breathing In the wastewater industry we find confined spaces everywhere. What would make a routine confined space turn into a "permit required" confined space? - ANS:->> Any work that may change the air quality It is unfortunate that in the wastewater industry most of our injuries are to what part of the body? - ANS:->> Head and Back Hydraulic cleaning methods consist of cleaning a sewer with: - ANS:->> Water under pressure that produces high water velocities There are different areas of traffic zones when working in roadways? - ANS:->> Four Before starting a maintenance operation in an easement located in a backyard of a residence you should? - ANS:->> Contact the resident, and politely ask for permission to enter the backyard. If a ticket is called into Dig Alert on Friday at 8am, when is the earliest you can dig? - ANS:->> Wednesday 8am (the day you call does not count) Personnel entering a Permit Required Confined Space must have the following training? - ANS:->> Entry and rescue procedures Four conditions are necessary to create an explosion. Three of these conditions are combustible gas, adequate oxygen and sufficient heat. What is the fourth? - ANS:->> Proper mixing of gas and oxygen Flatter sewer line grades may cause added sewer maintenance expense and order nuisance. The problem is most likely caused by? - ANS:->> A decrease in velocity
allowing gases to be released from the wastewater How often must an excavation site and adjacent areas be inspected for hazardous conditions? - ANS:->> Daily Protective shoring systems options include all but: - ANS:->> Working in an un-sloped trench with no shoring Sewer testing methods do not include: - ANS:->> Sewage When a citizen wants information regarding a maintenance operation you should? - ANS:->> Give them as much factual information as you can, and offer to help them further. Maintenance programs are based on? - ANS:->> Preventive and corrective maintenance principles
The underside of a manhole lid can? - ANS:->> Harbor dangerous insects An advantage of a CCTV system is the ability to? - ANS:->> Record infiltration water flow in action One method of televising through flooded low spots or a dip in a sewer line is to?
- ANS:->> Use a high velocity cleaner to push water clear of dip The purpose of forcing air into the sewer system when smoke testing is to? - ANS:->> Get an air flow established Lamping is a technique used to? - ANS:->> Determine if a sewer line is straight and clear of obstructions If a stoppage occurs below a sewer ball, it must be cleared as soon as possible to avoid? - ANS:->> Flooding homes and/or streets To find proper protective gear before application of a product, you would? - ANS:-
Look at the material safety data sheet (MSDS) The gas most commonly associated with septic wastewater is? - ANS:->> Hydrogen sulfide (H2S) The oxygen level alarm in a gas detection meter normally set to go off at oxygen levels below? - ANS:->> 19.5% What are the requirements for a Class B license? - ANS:->> Vehicle weight more than 26,000 Is What is the one thing you don't have to check on a pre-trip inspection? - ANS:->> Fuel
Which of the following would you check in your pre-trip first? - ANS:->> Gear box low oil What check should be performed before driving a vehicle? - ANS:->> Mechanical/Safety Wastewater collections systems are built to? - ANS:->> Carry away wastewater from homes and industries What are the main purpose of Manholes? - ANS:->> To access sewers What is the minimum size cone that can be used in a 25mph or 35mph zone? - ANS:->> 18" If the soil has a compressive strength of .05 or less it is considered? - ANS:->> Туре B If the soil strength is greater than .05 tsf but less than 1.5 tsf or has angular gravel, you have what type of soil? - ANS:->> B What does PVC stand for? - ANS:->> Polyvinylchloride CIWQS stand for: - ANS:->> California Integrated Water Quality System What would be the ideal sewer lateral connection to a sewer mainline? - ANS:->> Wye How long is a DigAlert ticket valid for (after which it is expired)? - ANS:->> 28 days
What is the least effective way of cleaning grease: - ANS:->> Bucket Machine Which testing method is not recommended for identifying I/I & Exfiltration for manholes: - ANS:->> Air/Water test A Mandrel is a: - ANS:->> testing device used to measure for excessive deflection in a flexible conduit. Why are gasoline and volatile solvents objectionable when present in a sewer? - ANS:->> They produce an explosion hazard You should never attempt to install, troubleshoot, maintain, repair or replace electrical equipment panels, controls, wiring or circuits unless: - ANS:->> you know what you are doing, are qualified, and are authorized. Why should hydrogen sulfide be controlled: - ANS:->> to protect sewers and structures from corrosion. 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: - ANS:->> some dangerous gases have no odor. What does "transition area" mean in traffic control? - ANS:->> Moves traffic out of its normal path What is one component of a Traffic Control Zone: - ANS:->> Transition Area. What elements should be considered to improve worker safety in High Speed Temporary Traffic Control Zones? - ANS:->> Rerouting Traffic around the work site, Positioning of Law Enforcement Officers in the Temporary Traffic Control Zone, Work Zone Training.
What key factors would you need to address when developing an S.O.P. for a Lift Station failure? - ANS:->> Traffic Control Plan, By-Pass connections, Spill Containment. Which conditions should a gas detection device test for? - ANS:->> Hydrogen sulfide, explosive/flammable gases, oxygen. What does "LEL" mean on a gas detection meter? - ANS:->> Lower explosive limit When developing an S.O.P for scheduled maintenance of electrical equipment, what program should be addressed as a primary safety guideline? - ANS:->> L.O.T.O What document would you require to be referenced when developing an S.OP. for hazardous substance spill cleanup as well as spill containment? - ANS:->> M.S.D.S In developing an S.O.P. for air monitoring in a Permit Required Confined Space you would include which of the following? - ANS:->> Placement of the Blower, P.P.E.
Vitrified clay pipe is what type of pipe? - ANS:->> Rigid Manholes include: - ANS:->> barrels, lids, cones. A hazard that may damage a TV camera going through a sewer is: - ANS:->> offset joints. How can the members of a balling crew communicate with each other? - ANS:->> Hand signals Why must you always know where a cleaning tool is in a sewer? - ANS:->> So you know where obstructions or difficulties are encountered. Lift station failure can include: - ANS:->> electrical circuit failures. What would cause a pump to deliver less than its expected rate of discharge? - ANS:->> Clogged impeller. Rodents and insects can be controlled by: - ANS:->> spraying manholes with an approved pesticide. How many types of common shoring are there? - ANS:->> 6 A person who completes a training program in accordance with the requirements of Title 8, Calif. Code of Regulations, Minimum Guidelines of the Common Ground Alliance is considered: - ANS:->> A Qualified person Why are wear rings installed in a pump? - ANS:->> To concentrate wear on rings instead of volute and impeller
What control types are used to start or stop pumps? - ANS:->> Floats What type of pump is used in lift station wet wells? - ANS:->> Submersible Centrifugal pump parts include: - ANS:->> volute. 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: - ANS:->> An agreed upon site visit 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? - ANS:->> 10 ft. 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? - ANS:->> 28" The minimum tire tread requirements on a combo truck are? - ANS:->> 2/32 rear and 4/32 front What do you do if you're in a confined space and your gas detector starts to alarm with a high toxic level and then zeros out and continues to alarm? - ANS:->> As soon as alarm goes off you must evacuate the confined space. Once confined space is has been evacuated you must re-evaluate the confined space atmospheric conditions by completing atmospheric testing again. If conditions show good re- calibrate test your gas detector to ensure proper working order.
What is a mandrel? - ANS:->> A Mandrel is a testing device used to measure for excessive deflection in a flexible conduit. A mandrel will not pass through a pipeline if the pipe has been deflected more than 5% What is the length of sewer line segment of upstream to downstream manholes if the first station is located at 1 + 53 and the second station is located at 11 + 25? - ANS:->> 1 + 53 = 153ft. and 11 + 25 = 1,125ft. What is a Plan View? - ANS:->> A drawing or photo showing the top view of sewers, manholes, streets or structures. What is a Profile View? - ANS:->> A drawing showing elevation plotted against distance , such as the vertical section of side view of sewers, manholes, or pipelines. What is a class A fire? - ANS:->> A = Wood
What is a class B fire? - ANS:->> B = Gas What is a class C fire? - ANS:->> C = Electrical What is a class D fire? - ANS:->> D = Metals How far should traffic control flaggers be positioned from the work space? - ANS:-
100ft. What are the 4 traffic control zones? - ANS:->> Advanced Warning Area, Transition Area, Activity Area, Termination Area USA, Color Coding: Red - ANS:->> Electricity USA, Color Coding: Yellow - ANS:->> Gas USA, Color Coding: Green - ANS:->> Sewer USA, Color Coding: Purple - ANS:->> Recycled USA, Color Coding: Orange - ANS:->> Communications
unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate the hazards, as defined by OSHA. What is a Collection System? - ANS:->> A network of pipes, manholes, cleanouts, traps, siphons, lift stations, and other structures used to collect all wastewater and wastewater-carried wastes of an area and transport them to a treatment plant. The collection system includes land, wastewater lines and appurtenances, pumping stations, and general property. Also called sewerage system. FOG: - ANS:->> fats, oils, and grease: Sewer pipes can become clogged from fats, oils, and grease and then overflow, releasing untreated wastewater. What is a sewer Interceptor? - ANS:->> Typically, a large-diameter pipe that acts as a main trunk of a sewer system. The interceptor is fed from sewer mains, which are fed by sewer laterals. In small communities, a septic tank or other holding tank that serves as a temporary wastewater storage reservoir for a septic tank effluent pump (STEP) system may be called an interceptor. NPDES Permit (National Pollutant Discharge Elimination System): - ANS:->> A regulatory document that limits discharges into US waterways and provides monitoring and reporting requirements and other provisions to ensure that discharges do not hurt water quality or people's health. Part of the Clean Water Act prohibits the discharge of potential pollutants from point sources of pollution and stormwater runoff into a water of the United States without an NPDES permit. SCADA System (Supervisory Control and Data Acquisition): - ANS:->> A computer-monitored alarm, response, control, and data acquisition system used to monitor and adiust treatment processes and facilities. A traffic control flagger should wear a hard hat: - ANS:->> White
The Buffer Zone is part of what traffic control component: - ANS:->> Activity Area A method that involves cutting, pushing, scraping, or pulling debris out of a pipe.
- ANS:->> Mechanical Sewer Cleaning Used when there is heavy roots or debris in the pipe. - ANS:->> Step cleaning What are some Rodder cleaning tools: - ANS:->> Auger, Root Saw, Spring Blade Root Cutter Chuck, Bullet Nose, Sand Leader Shoring Types: - ANS:->> Hydraulic shores, Screw jacks, Shields, Lag, Beam Non-Permit confined permit space: - ANS:->> A confined space that does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death or serious physical harm. A permit is not required for entry into a non-permit space but conditions in the space should be evaluated before entry and a safe environment must be maintained while anyone is working in the space. Permit-Required confined space: - ANS:->> is a confined space that contains or has a potential to contain a hazardous atmosphere, contains a material that has the potential for engulfing an entrant, has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor that slopes downward and tapers to a smaller cross section, or contains any other recognized serious safety or health hazards. True or False: In an emergency you can dig, but you take responsibility. Agencies are good about responding quickly in an emergency. - ANS:->> True What is a lift station? - ANS:->> A wastewater lift station is a pump station
