California Water Distribution Grade 3 Questions & Answer Already Solved 100%

R.P.P.A. - Answer Reduced pressure principal assembly. Backflow prevention for back siphonage and back pressure. American Public Works Association color codes. White,pink,red,yellow,orange, blue, purple and green - Answer White=proposed excavation Pink=temporary survey markings red=electric power yellow=gas,oil and steam orange=communications(phone/cable) blue=water purple=reclaimed water green=sewer and storm drains. Distance between water and sewer lines. - Answer Running parallel-at least 10ft apart. Perpendicular crossing-water lines at least 1ft above sewer. Common trench-water and sewer must not be in same trench. Water main and force main regulations. - Answer Parallel-at least 10ft apart. Perpendicular crossing-Water lines at least 1ft above and force main should be encased 10ft in both directions. New water lines installed over force mains should be rated to 200psi or equivalent. Force mains over 1000ft must have clean outs every 600ft. Fire extinguishers Class A, B, C, D and K - Answer A=ordinary combustibles. Wood, paper, cloth trash and plastic. B=Flammable liquids. Gasoline, petroleum oil and paint. C=Energized electrical equipment. Motors, transformers and appliances. D=Combustible metals. Potassium, sodium, aluminum and magnesium. K=Cooking oils and grease. Drawdown - Answer Difference between the static pumping level and the pumping water level. Residual drawdown - Answer A lowered water level that remains for a period of time after pumping has been stopped. Cone of depression - Answer Depressed water surface around a well when pumps are operating. What is Coliform Bacteria? - Answer A group of bacteria found in the intestines of warm blooded animals. Also found in plants, soil, air and water. It's positive test is and indication that the water is polluted and may contain pathogenic (disease causing) organisms. Most coliform bacteria are not necessarily bad for you, but are used as an indicator to warn of more harmful bacteria. Testing this way is the easiest, most efficient and least expensive way. E. coli, however, is a type of coliform bacteria (fecal) that can make people sick. 4 types of corrosion - Answer Chemical: Low PH/ soft water Electrical: Galvanic reaction of dissimilar metals where one erodes the other. Erosion: Velocity greater than 5 feet per second erodes pipes and bends like sandpaper over time. Also increases dissolved oxygen content in highly oxygenated water. Biological: Living organisms-Iron bacteria and sulfate reducing bacteria. Common in ground water. What is corrosion? - Answer The gradual decomposition of a material over time by a chemical action. Tier 1 violations - Answer Directly and immediately affect public health. -Fecal coliform positive. -Nitrite, nitrate or total MCL violation. -Chlorine Dioxide MRDL violation. -Turbidity MCL violation. -Perchlorate MCL violation. Relationship between Nitrates and methemoglobinemia. - Answer Nitrates are ingested and converted in the body to a substance that reacts with oxyhemoglobin, the oxygen carrying blood protein, to form methemoglobin, which cannot carry oxygen. Enough can be formed to deprive body tissues of oxygen causing blue skin color(blue baby disease) and respiratory problems. 2 Groups involved in Nitrification - Answer Ammonia oxidizing bacteria Nitrite oxidizing bacteria Lead and Copper Rule - Answer Objective: control the corrosiveness of finished water to limit the amount of lead and copper leached from pipes and fittings. Collect first draw samples(sitting for at least 6 hours) from high risk residents. Provides action levels instead of MCL's. Action levels: Lead .015 ppm -Copper 1.3 ppm Calls for lead free pipes and fixtures. Less than or equal to 8% lead in pipes. Less than or equal to 0.2% lead in solder Utilities not in compliance must modify treatment techniques until they are in compliance. Dynamic Water - Answer Water moving Volatile - Answer A liquid capable of going from liquid to gas at a relatively low temperature. Flexural strength - Answer Resistance to breaking while being bending. Safe Drinking Water Act - Answer Passed by congress in 1974 creating uniform national standards for drinking water quality to ensure every public water supply would meet minimum health standards. Set primary and secondary regulations. Created the Total Coliform Rule, Surface Water Treatment Rule and Lead and Copper Rule among others. Tier 2 Violations - Answer -All MCL or MRDL treatment technique violations except those that are Tier 1 -Monitoring Violations if elevated to Tier 2 -Failure to comply with variance or exemption conditions. 95 degrees for 24 Hours is? - Answer Test for coliform bacteria. Will produce gas and acid in lactose or a lauryl tryptose broth. Public water system break down. - Answer Community Water System-Piped water for consumption with 15 or more service connections. Non Community Water System-Serves 25 or more people for 60 or more days of the year. -Transient non community- Not the same 25 people. Only test for nitrite/nitrate and coliform bacteria. Except:Rest stops, parks and motels. -Non Transient Non Community-Same 25 people. Test for everything. Except Schools and factories. Nitrite/Nitrate MCL - Answer Measured as Nitrogen. -Nitrate 1 mg/L -Nitrate 10 mg/L(some communities are allowed 20)