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b) When back fill, slightly mound filled trenches for settlement after back fill is compacted. Compact back fill to a 90% maximum density in accordance with ASTM D1557 with a mechanical tamper. Do not leave trenches open for a period greater than 48 hours. Open trenches shall be protected in accordance with current OSHA regulations. c) Smooth trenches to finish grade prior to requesting a walk through for substantial completion with The City of Santa Ana authorized representative. 3.2 POINT OF CONNECTION(S) A. Point of connection shall be approximately as shown on drawings. Connect new underground piping and valves and provide all flanges, adapters, or other necessary fittings. 3.3 INSTALLATION OF COPPER PIPE A. Copper piping shall be cut by a power hacksaw, a circular cutting machine using an abrasive wheel, or by means of a hand hacksaw. No piping shall be cut with a metallic wheel cutter of any description. All pipes shall be reamed and rough edges or burrs removed so that a smooth and unobstructed flow is obtained. B. Eccentric reducing fittings shall be used where any change in pipe size occurs. Bushings shall not be used unless specifically authorized by the architect. C. Apply emery cloth to all pipe ends and wipe with clean cloth prior to solder welding pipe end to fitting. Apply an even layer of flux along area to be soldered and apply solder uniformly around joint and let cool. After cooling lightly apply emery cloth along soldered area until smooth. D. All exposed piping under structural slabs shall be stenciled with "Irrigation Main" or "Irrigation Lateral" as required, at ten foot (10) intervals in black lettering, 3/4" minimum high. 3.4 INSTALLATION OF BRASS PIPE A. Brass piping shall be cut by a power hacksaw, a circular cutting machine using an abrasive wheel, or by means of a hand hacksaw. All pipes shall be reamed and rough edges or burrs removed so that a smooth and unobstructed flow is obtained. B. Eccentric reducing fittings shall be used where any change in pipe size occurs. Bushings shall not be used unless specifically authorized by the architect. C. Joint compound shall be carefully and smoothly placed on the male thread only. All screwed joints must be tightened with tongs or wrenches. Caulking of any kind will not be permitted. D. All exposed piping under structural slabs shall be stenciled with "Irrigation Main" or "Irrigation Lateral" as required, at ten foot (10') intervals in black lettering, 3/4" minimum high. 3.5 BACKFLOW PREVENTION DEVICE A. Install Backflow prevention device and associated equipment at the location as specified on drawings. B. Coordinate installation with local governing codes and ordinances. 3.6 FLOW SENSORS A. Install flow sensors as specified on drawings. B. Install flow -sensing cable in a separate conduit and connect to terminal strip at controller. 3.7 MASTER VALVES City of Santa Ana RFP 17-127 Page 17