California Water Distribution Grade 3 Study Guide Rated A+

California Water Distribution Grade 3 Study Guide Rated A+ R.P.P.A. 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 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. 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. 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 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 Difference between the static pumping level and the pumping water level. Residual drawdown A lowered water level that remains for a period of time after pumping has been stopped. Cone of depression Depressed water surface around a well when pumps are operating. What is Coliform Bacteria? 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 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? The gradual decomposition of a material over time by a chemical action. Tier 1 violations 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.