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California Water Distribution Grade 3 Study Guide Rated A+
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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
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