WASTEWATER CERTIFICATION TEST 2023 QUESTIONS AND ANSWERS ALREADY PASSED A+

Surface water runoff, storm water, sanitary and industrial. - CORRECT ANS A collection system that is called "combined" may carry this kind of wastewater: 2 - CORRECT ANS The flow in a collection system should be a minimum of ____ feet per second (FPS)? Solids will settle. - CORRECT ANS What will happen if the flow is too slow in a collection system? Odors, Corrosion, Hydrogen Sulfide Gas (all of the above) - CORRECT ANS A short detention time in the collection system will help prevent which of the following problems? Low areas must be sewered. - CORRECT ANS When are lift (pumping) stations installed in a collection system? Parentheses, Exponents, Multiplication, Division, Addition, Subtraction - CORRECT ANS The order of operations to solve math problems is: (from first to last) 27 - CORRECT ANS 3^3 24 - CORRECT ANS (5+7)x4/2= 19 - CORRECT ANS 7+6X4/2= 4 - CORRECT ANS 2X+12=20. What is "X" equal to? 3,000,000gal/1,500,000MGD = 2 days = 48 hours - CORRECT ANS The volume of a tank is 3,000,000 gallons (3MG) and the flow rate into the tank is 1,500,000 gallons per day (1.5 MGD). Calculate the detention time in hours. (750 GPM)(60 min/hr)(24 hr/day)/1,000,000 = 1.08 MGD - CORRECT ANS A pump is rated at 750 gpm. Calculate the flow rate in million gallons per day (MGD). 1.5MG/1MLSS x 3.785L/1gal = 5.6775MG/1gal x 1lbs/453,592.37MG = 25.04 lbs/day - CORRECT ANS A secondary clarifier discharges 2 MGD and the effluent contains 1.5 mg/l of mixed liquor suspended solids (MLSS). Calculate the pounds per day of MLSS discharged. (F012, F017, F022, F035) (200 mg/L - 15 mg/L)/(200 mg/L) x 100% = 92.5% - CORRECT ANS The influent to a clarifier contains 200 mg/l of total suspended solids (TSS). What is the efficiency in % if there is 15 mg/l of TSS in the effluent? (F011 , F018) x= 0.785 x (100)^2 x (20) = 157,000 cf x 7.481/gal = 1,174,517 gal - CORRECT ANS A clarifier is 100 ft. in diameter and 20 ft. deep. How many (ft^3) of water does the clarifier hold? How many gallons of water? Be subject to categorical standards, >25,000 gpd of process water or 5% or more of POTW capacity, have a reasonable potential to adversely affect POTW. (all of the above) - CORRECT ANS To be define as a "significant industrial user" the industry must: Prevent introduction of pollutants that will interfere with and/or pass through with the POTW, and improve opportunities to recycle and reclaim water and sludges. (Both a and b) - CORRECT ANS The major objectives of National Pretreatment Program include which of the following: Federal Water Pollution Control Act Amendments of 1972. - CORRECT ANS The origin of the National Pretreatment Program goes back to this act: NPDES permit - CORRECT ANS The POTW requirement to develop and implement a pretreatment program for industries is a condition of what? Once a year - CORRECT ANS When are Control Authorities required to inspect significant industrial users? Identify responsible Control Authority officials, Identify the general time frame for actions, Potentially escalated actions based on the nature, frequency, magnitude and duration of the violation. (all of the above) - CORRECT ANS What is the purpose of an Enforcement Response Guide (ERG)? Sludge deposits, floating debris, color, odor, and toxics (all of the above) - CORRECT ANS Which of the following are undesirable conditions or substances in the waters of the state? Full-body contact recreation - CORRECT ANS All surface waters of the state are designated for_____. Yes, 750 - CORRECT ANS My wastewater treatment plant receives brine wastes from water softeners. Could the salt discharge increase the dissolved solids concentration of the effluent above the state limit for TDS, which are ______ mg/L? Ave. = 5 mg/l per calendar day and not <4mg/l at any time. - CORRECT ANS What is the minimum dissolved oxygen (DO) requirement in surface waters of the State of Indiana? Aquatic - CORRECT ANS All waters of the state, except limited use waters, must be capable of supporting a well-balanced, warm water _______ community. Geometric mean - CORRECT ANS For fecal coliform, and E.coli, the average monthly discharge and average weekly discharge, as concentrations, shall be calculated using: 5 - CORRECT ANS The maximum term of an NPDES permit is how many years? 3 years - CORRECT ANS How long must all records of monitoring activities and results be retained? 180 days - CORRECT ANS How soon before the expiration date should the permittee submit a new application for an NPDES permit? Bypass - CORRECT ANS A "______" is the intentional diversion of waste streams from any portion of an industrial user's treatment facility. $10,000 fine, 180 days jail - CORRECT ANS What are possible penalties for noncompliance with NP