Grab sampling - Study guides, Class notes & Summaries

1. How much does a cubic foot of water weigh? - Answer-a. 8.34 lbs b. 7.48 lbs c. 62.38 lbs d. 15.82 lbs 2. What is the best way to store a 150# chlorine gas cylinder? - Answer-a. On its side b. Above ground level c. Upright, secured from falling 3. Which is not a proper alternative for treatment of industrial wastewater? - Answer-a. Pretreatment by the IWTS followed by discharge to the POTW b. Direct discharge to receiving waters c. Discharge to POTW for treatment d. Complete treatme...

What is the turbidity measurement that is visible to the naked eye? - ️️5 NTU What is the purpose of flocculation? - ️️To achieve optimum size particles which will readily settle out of the water or can be easily filtered. Addition of too much or too little coagulant decreases the efficiency of the treatment process. What are packing glands? - ️️Seals which prevent the pumped fluid from leaking from a pump and prevent air from entering What is backflow siphonage caused by in di...

What are colloids? - Very small particles suspended in water which are resistant to settling. What is turbidity measured in? - Nephelometric Turbidity Units (NTU) What is the turbidity measurement that is visible to the naked eye? - 5 NTU What is an important indicator of treatment efficiency and particularly the efficiency of filters and disinfection processes? - Turbidity Why are particles that cause turbidity harmful? - They can hide or entrap harmful organisms so that the disinfe...

Concrete samples typically contained in order to perform the following standard concrete tests: _______ , ________ , _______ , and _______. - Answer- slump, plastic air content, temperature, and casting of compressive strength moulds What are the two types of sampling? - Answer- Evaluation of the concrete quality Evaluation of the uniformity Define the evaluation of the concrete quality sampling type. - Answer- Involves obtaining a single concrete sample at the appropriate location within...

Sampling from a mixer/truck agitator- Where is sample taken? - CORRECT ANSWER Between 10% and 90% (Not when testing with Super P) How is a sample taken when sampling plastic concrete? - CORRECT ANSWER Either pass a receptacle completely through a discharge stream OR divert a discharge stream completely into a sampling container. How many grab samples are needed when testing for uniformity of samples? - CORRECT ANSWER 3 What size sample is needed when casting 3 100mm x 200mm cyl...

To have significant meaning for laboratory tests of the evaluation of a wastewater treatment plant's performance the best method of sampling is A. Grab sampling B. Hourly sampling C. Sampling during peak flow D. Proportional composite sampling E. Automatic sampling - correct answer D. Proportional composite sampling BOD samples should be collected before chlorination because A. Chlorine reacts with the buffer solution B. Chlorine interferes with the activity of organisms C. Chlorine ...

CCIL Exam Study Guide | Questions and Correct Answers | Latest Update 2024/2025 | 100% Pass Sampling from a mixer/truck agitator- Where is sample taken? - Answer -Between 10% and 90% (Not when testing with Super P) How is a sample taken when sampling plastic concrete? - Answer -Either pass a receptacle completely through a discharge stream OR divert a discharge stream completely into a sampling container. How many grab samples are needed when testing for uniformity of samples? - Answer...

CWEA Grade I Laboratory Analyst, questions and answers 2023 Chloride - Major anion found in many natural waters - Can impart salty taste in H2O What increases concentration of chloride in wastewater Chloride in human diet and softeners flushed into sanitary sewer system 2 most prevalent methods of measuring chloride argentometric and mercuric nitrate Argentometric Titration of sample with standard solution of silver nitrate (AgNO3) - Indicator: Chromate ions (CrO4) -...

CCIL Quiz with Complete Solutions 100% Verified Rated A+ Between what percentages must you sample a concrete truck? - Correct Answer 10% and 90% What is grab sampling? - Correct Answer Securing at one point of the discharge as fast as possible. Tamping rod size for 100 x 200mm cylinders - Correct Answer 10 +/- 1mm in diameter, between 450 mm and 600 mm Minimum sample required for 150 x 300mm cylinder? - Correct Answer 30L How long do you have to obtain, transport and remix sample? -...

What are grab samples and when is it used? - ️️A single sample taken at one place and time. Used when water quality and quantity are not variable What is used to measure flow in an open channel? - ️️Weirs or flumes. Flow is determined by the height of water at a particular point Why are particles that cause turbidity harmful? - ️️They can hide or entrap harmful organisms so that the disinfectant is unable to reach them. It calls increases CL demand which can be carcinogenic Wh...