CWEA Lab Analyst Grade 1

Sewer maintenance vehicles are difficult to maneuver At low concentrations, hydrogen sulfide smells like Rotten Eggs which safety hazard in a collection system operations can be detected by an insturment? Toxic Gases What must be checked first before entering a manhole? Proper barricades or warning devices around manhole. When should field crews use signs and cones? When over half the street is blocked. The different zones of traffic control include buf...

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...

An amperometric titration is often used when measuring Residual chlorine The most important reason for chlorinating effluent is Disinfection Chlorination serves primarily to destroy or deactivate disease-producing microorganisms When wastewater samples are chlorinated and the pH is lowered HCLO is formed Hypochlorous acid Which of the following constituents is the best disinfecting agent? HClO What is most likely to interfere with the DPD test? Oxidized man...

Define reagent grade water Water with no detectable concentration of compound or element to be analyzed i.e it is below the method's detection level. What is osmosis? The net movement of water through a semipermeable membrane towards an area of higher solute concentration. What are the various ways reagent grade water is prepared? Distillation, reverse osmosis, ion exchange, carbon adsorption, filtration, ultrafiltration, ultraviolet oxidation. Standard Methods is a comp...

Within the federal government, the following branch generates laws: (a) Congress (b) Office of the President (c) Supreme Court (d) Library of Congress A Explanation Just a little reminder from your high school government class. The federal government is divided into 3 branches: executive - the President; legislative - Congress (the Senate and the House of Representatives); and judicial - the Supreme Court. The legislative branch generates laws so the correct answer is Congress. The Li...

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 ...

Celcius (F-32)5/9 HPC media water bath 45`C, 3hr Precision a measure of how close a series of measurements are to one another Accuracy how close a measurement is to the true value Electrical Fire unplug & sodium bicarbonate analytical balance a device for determining mass that gives highly accurate measurements top loading balance used to determine mass; not as precise as an analytical balance triple beam balance instrument used to measu...