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CWEA CERTIFICATION PAPER 2026 FULL
SOLUTION GRADED A+
โ You should never attempt to install, troubleshoot, maintain, repair, or replace electrical equipment unless: Answer: You know what you are doing, are qualified, and are authorized. โ How many different areas of traffic zones are there when working in roadways? Answer: Five โ Why should hydrogen sulfide be controlled? Answer: To protect sewers and structures from corrosion โ Personnel entering a Permit Required Confined Space must have the following training: Answer: Entry and rescue procedures โ To find proper protective gear before application of a product, you would: Answer: Look at the MSDS (Material Safety Data Sheet) โ The gas most commonly associated with septic wastewater is: Answer: Hydrogen Sulfide (H2S)
โ The lack of an unpleasant odor in a structure does not always mean that dangerous gases are not present because: Answer: Some dangerous gases have no odor โ What four conditions are necessary to create an explosion? Answer: Combustible gas, adequate oxygen, sufficient heat, and proper mixing of gas and oxygen. โ What does "transition area" mean in traffic control? Answer: Moves traffic out of its normal path โ The term "transition area" is one component of a: Answer: Traffic Control Zone โ What elements should be considered to improve worker safety in High Speed Temporary Traffic Control Zones? Answer: Rerouting traffic around the work site, positioning of law enforcement officers in the temporary traffic control zone, and work zone training. โ What key factors would you need to address when developing an S.O.P. for Lift Station failure? Answer: Traffic control plan, by-pass connections, and spill containment. โ "Spring Blades" are a type of tool used with: Answer: Power Rodder
โ According to a State Water Resources Control Board order, each Enrollee must develop and implement a system-specific: Answer: Sewer System Management Plan (SSMP) โ Category 1 SSO's that discharge to a drainage channel and/or surface water must be reported within: Answer: 2 hours โ 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: Answer: the GPS coordinates โ Biological activity in long, sluggish-flow, flat grade sewer lines will likely cause odors, true or false? Answer: True โ Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by: Answer: A decrease in velocity allowing organic and inorganic solids to settle out โ Infiltration from a high water table can be one source of excessive clear water in a collection system, true or false? Answer: True โ What is the first thing to consider when selecting a solution to clear a stoppage in a sewer? Answer: Cause of stoppage
โ The interior of 300 feet of 12-inch pipe is uniformly coated with one inch of grease. How many gallons will this pipe hold when filled with water? Answer: 12 inches (diameter of pipe) - 2 inches (grease on pipe) = 10 inches Convert inches to feet: 10 inches x (1 foot / 12 inches) = 0.833 feet Volume of a right regular cylinder: V = 0.785 x Diameter x Diameter x Length of Pipe V = 0.785 x 0.833 ft x 0.833 ft x 300 ft V = 163.41 cubic feet Convert to Gallons: 163.41 cu ft x (7.48 gal / 1 cu ft) = 1223.31 gal โ Infiltration can be caused by cracked pipes, true or false? Answer: True โ The main reason for adding sodium hypochlorite to sewers is to control: Answer: Odor โ Roots can enter collection systems through pipe cracks, true or false? Answer: True โ The lowest point on the inside of a pipeline is called the: Answer: Invert
โ Using high velocity cleaners is one method included in hydraulic sewer cleaning, true or false? Answer: True โ A flow of 650 gpm would be how many MGD? Answer: 650 gpm x (1440 min / 1 day) = 936000 gpd 936000 x (1 MG / 1000000 gal) = 0.936 MGD โ One of the advantages of using CCTV is that the length and severity of defective pipe areas can be recorded, true or false? Answer: True โ Offset joints are one hazard that may damage a TV camera going through a sewer, true or false? Answer: True โ What is the total volume of 1000 feet of 8 inch line? Answer: Convert inches to feet: 8 inches x (1 foot / 12 inches) = 0. Volume of a right regular cylinder: V = 0.785 x Diameter x Diameter x Length of Pipe V = 0.785 x 0.666 ft x 0.666 ft x 1000 ft V = 348.19 cu ft Convert to gallons: 348.19 cu ft x (7.48 gal / 1 cu ft) = 2604.47 gal
โ If an 8 inch force main has a metered flow rate of 400000 gpd, what is the velocity? Answer: Velocity = Flow / Area Area = 0.785 x Diameter x Diameter When finding Area, convert Diameter into feet 8 in x (1 ft / 12 in) = 0.667 ft Area = 0.785 x 0.667 ft x 0.667 ft = 0.349 sq ft Convert flow in gallons to cubic feet per second: (400000 gal / 1 day) x (1 cu ft / 7.48 gal) x (1 day / 24 hours) x (1 hr / 60 min) x (1 min / 60 sec) = 0.619 cu fps Velocity = 0.619 cu fps / 0.349 sq ft Velocity = 1.77 fps โ During the 24-hour operation a lift station pumped 3000 gallons per minute for a community of 27000. What is the per capita pumped in gallons per day? Answer: GPD / Capita = Volume Pumped Per Day / Number of people Volume = (3000 gal / 1 min) x (60 min / 1 hr) x (24 hr / 1 day) Volume = 4320000 gal GPD / Capita = 4320000 gal / 27000 people GPD / Capita = 160 โ A wet well 20 feet in diameter is filled with water to a depth of 10 feet. How many gallons does the tank contain? Answer: Volume = 0.785 x Diameter x Diameter x Height
7 min (60 sec / 1 min) = 420 sec Velocity = 860 ft / (420 sec + 30 sec) Velocity = 860 ft / 450 sec Velocity = 1.91 fps โ An upright circular cylinder tank (flat bottom) has a diameter of 12 feet. When filled to a depth of 8 feet, what is the volume? Answer: Volume = 0.785 x Diameter x Diameter x Height Volume = 0.785 x 12 ft x 12 ft x 8 ft Volume = 904.32 cu ft โ Once enrolled in CIWQS, the "Collection System Questionnaire" must be updated at least every: Answer: 12 months โ You received a sewer spill call at 1100 hours, arrived on site at 1115, and your crew relieved the stoppage at 1127. You estimate the spill was running at 6 gallons per minute. How much sewer went un-captured? Answer: Duration x Flow Rate = Spill Volume 27 min x 6 gpm = 162 gallons โ Lift station failure can include electrical circuit failures, true or false? Answer: True
โ A clogged impeller can cause a pump to deliver less than its expected rate of discharge, true or false? Answer: True โ Why are wear rings installed in a pump? Answer: To concentrate wear on rings instead of volute and impeller โ Floats can be used to start or stop pumps, true or false? Answer: True โ Submersible pumps can be used in wet wells, true or false? Answer: True โ Centrifugal pump parts include a volute, true or false? Answer: True โ You receive a call at 4:30 pm about a sewer spill that was seen spilling since 2 pm. You arrive at 5:15 pm and estimate the sewer spilling at 166 gpm. You clear the stopage 22 minutes after your arrival. How many gallons were unrecoverable? Answer: Duration x Flow Rate = Spill Volume 217 min x 166 gpm = 36022 gal โ How long is an Inquiry Identification Number for an Underground Service Alert (USA) viable for? Answer: 28 days
โ Maintenance programs are based on preventative and corrective maintenance principles, true or false? Answer: True โ The goal of preventative maintenance is to avoid breakdowns, severe damage, or harmful depreciation, true or false? Answer: True โ
