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B . THE PUMPING SYSTEM SHALL BE PROTECTED FROM THE <br /> HAZARDS OF THE ENVIRONMENT IN WHICH IT IS INSTALLED . <br /> C . USE ELECTRIC MOTORS WITH A NOMINAL HORSEPOWER <br /> RATING GREATER THAN THE MAXIMUM HORSEPOWER <br /> REQUIREMENT OF THE PUMP DURING NORMAL OPERATION . <br /> MOTOR SHOULD HAVE A SERVICE FACTOR OF AT LEAST 1 . 15 . <br /> D . THE WELL SHALL BE CONSTRUCTED FOLLOWING LOCAL WATER <br /> MANAGEMENT DISTRICT REGULATIONS TO PROTECT THE <br /> AQUIFER FROM CONTAMINATION . <br /> E . CASINGS FOR DRILLED WELLS MAY BE STEEL , REINFORCED <br /> PLASTIC MORTAR , PLASTIC , OR FIBERGLASS PIPE , ONLY STEEL <br /> PIPE CASINGS SHALL BE USED IN DRIVEN WELLS . STEEL PIPE <br /> MUST HAVE A WALL THICKNESS EQUAL TO OR GREATER THAN <br /> SCHEDULE 40 . SEE NRCS CODE FL-642 , STEEL CASINGS SHALL <br /> BE EQUAL TO OR EXCEED REQUIREMENTS OF ASTM A= 589-96 . <br /> CHEMICAL INJECTION EQUIPMENT <br /> A. CHEMICAL INJECTION EQUIPMENT MUST BE CONSTRUCTED OF <br /> MATERIALS CAPABLE OF WITHSTANDING THE POTENTIAL <br /> CORROSIVE EFFECTS OF THE CHEMICALS BEING USED ,. <br /> EQUIPMENT SHALL BE USED ONLY FOR THOSE CHEMICALS FOR <br /> WHICH IT WAS INTENDED AS STATED BY THE INJECTION <br /> EQUIPMENT MANUFACTURER . <br /> BACKFLOW PREVENTION <br /> A. AIR GAP SEPARATION : THIS METHOD CONSISTS OF A PHYSICAL <br /> SEPARATION BETWEEN THE WATER SUPPLY AND THE <br /> IRRIGATION SYSTEM , SO THAT THERE IS NO POSSIBILITY OF <br /> THE DISCHARGED WATER FLOWING BACK TO THE WATER <br /> SUPPLY . THE AIR GAP SEPARATION MUST BE A MINIMUM OF <br /> TWICE THE DIAMETER OF THE DISCHARGE PIPE OR 1 - INCH , <br /> WHICHEVER IS LARGER , REFER TO LOCAL PLUMBING CODES <br /> FOR NON-STANDARD AIR GAP INSTALLATIONS . <br /> B . BACKFLOW PREVENTION ASSEMBLIES : <br /> 1 . AN ATMOSPHERIC VACUUM BREAKER CONSISTS OF AN AIR <br /> INLET PORT AND A FLOAT TYPE CHECK VALVE . THIS DEVICE <br /> MUST MEET ASSE STANDARD 1001 . <br /> 2 . A PRESSURE VACUUM BREAKER CONSISTS OF AN AIR INLET <br /> PORT , ONE POSITIVE SEATING CHECK VALVE AND AN <br /> INTERNALLY FORCE LOADED DISC FLOAT ASSEMBLY <br /> DOWNSTREAM OF THE CHECK VALVE , INSTALLED AS A UNIT <br /> BETWEEN TWO RESILIENT SEATED SHUTOFF VALVES AND <br /> FITTED WITH PROPERLY LOCATED TEST COCKS . THIS <br /> DEVICE MUST MEET ASSE STANDARD # 1020 AND BE <br /> APPROVED BY THE FOUNDATION FOR CROSS CONNECTION <br /> F :\Engineering\Special Projects\Eagle Trace Phase 2\Contract Documents\Eagle Trace Subdivision Phase <br /> II\IRRIGATION SPECIFICATIONS from W. F.McCain .doc - 4 . <br />