CWEA Study guides, Class notes & Summaries

Receiving job instruction and planning equipment use are part of: a. craft data. b. job preparation. c. work factors. d. leveled time. b. job preparation Anticipating other tasks or problems: a. usually creates additional problems. b. wastes time. c. sharply reduces the number of emergencies. d. often is not worth the effort. c sharply reduces the number of emergencies Making job planning a group effort: a. wastes time. b. improves productivity. c. causes confusion. d. All ...

In order to accurately estimate the flow of a sanitary sewer overflow (SSO) you must have: 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: A sewer system management plan (SSMP) What are the basics elements of a safety program? Safety policy, statement, safety training, accident investigation What factor must be considered when obtaining an easement for construc...

What does COLOR measure? Amount of color units (CU) in a sample. Color caused by natural metallic ions (Fe & Mg) & industrial wastes. What is the test summary for COLOR? Sample -> Tubes -> Compare to color standards over light source Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the sample matrix? Extraction In the cyanide determination, which one of the following is not an interference? Halogenated aromatics Which of the following is n...

An industry operating an 8-hour shift, 5 days per week, generates 100,000 gallons of wastewater per shift. Their pretreatment system has a capacity of 150 gallons per minute. How long must the pretreatment facility operate to process the wastewater generated each day? 11.1 hours An industry has five sewer connections with the following discharge rates: 1) 300 gpd, 2) 75 gpd, 3) 725 gpd, 4) 1,200 gpd, 5) 200 gpd A flow-weighted composite sample of 5 liters is desired. How many milliliters of s...

If the potential difference across the coil is low, the coil will: A-draw too much current B-become too hot C-Produce too much magnetic force D-not heat up D-not heat up The NEC identifies environments that contain flammable vapors and gases as which class of hazardous location? A-Class I B-Class II C-Class III D-Class IV A-Class I Which of the following reduces high voltages and currents to save values for measurements? A-auto transformer B-megohmmeter C-instrument transforme...

Why are gasoline and volatile solvents objectionable when present in a sewer? They produce an explosion hazard You should never attempt to install, maintain, repair or replace electrical equipment panels, controls, wiring or circuits unless You know what you are doing, are qualified and are authorized What are the different areas of traffic zones? Advance Warning Area, Transition Area, Activity Area (buffer space and work space), Termination Area. Could be 4 or 5, justify your answer on th...

If transformer primary=120v and secondary 12v=20 amps, what are the amps on the primary? 2 amps. Formula: I =Amps/Volume of current E = Volts/Force moving the current P = Watts, Electrical power produced I x E=P 12 x 20=240watts In a transformer watts stay the same so now: P/E=I 240/120v=2 amps If 17.32v are applied across a resistance of 50 ohms, how much power is expended in the resistor? 6.0 watts. Formula: V squared/R = P 17.32 squared(299.98)/50=5.99 Confined Space A spa...

What is PPE Category 1? Arc-Rated clothing, Minimum Arc Rating of Arc 4 cal/cm2 arc-rated long sleeve shirt and pants or overall Parshall Flume Measurement point? 1.2 FT Water Height 20.8xH at measurement point Possible answer:72,607 MGD Absoulte Pressure Gauge? What is True? Possible answer: Read more accurate or 14.7 PSI higher Flow meter that uses electrodes is? Magnetic Flow Meters What is the resister color code : Orange, White,Silver,Gold Band .39 Ohms Pitot tube measures?...

Indirect Potable Reuse (IPR) The blending of advanced treated, recycled or reclaimed water into a natural water source (environmental barrier) that could be used for drinking (potable) water after further treatment. Direct Potable Reuse (DPR) Process of treating wastewater to drinkable standards and returning it to the raw water supply (distribution system) without the use of an environmental buffer. Rather than mixing the treated water into an aquifer or reservoir What has led to the rese...

40 CFR 121- 124 The federal storm water regulations for the permitting of municipalities and industries. Regulations define storm water terms, permitting, inspecting, and sampling measurements 40 CFR 136 The regulations for sampling preservation and analyses of water, wastewater, and solid waste 40 CFR 403 The federal regulations defining the elements of a pretreatment program, prohibited discharges, and the approval process for establishing a pretreatment program Acid A compound which ...