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rock or plywood. Note: No ferrous (black iron, iron or galvanized) pipe is permitted. Fire sprinkler riser check valves shall be approved by the City and Fire Prevention Bureau. Chapter 7-Installation Section 7.1 Valves is amended: Section 7.1.2 (1) amended to read: (1) To a Underwriters Laboratory (UL) listed Central Station Service Sections 7.1.2 (2) and (3) are deleted. Section 7.6 Alarms is amended to read: Local water flow alarms shall be provided on all sprinkler systems. Water flow alarms and valve tamper shall be connected to an Underwriters Laboratory (UL) listed Central Station Service under the following conditions: (a) All buildings with 8 or more units or, (b) When there are 4 or more buildings per complex or, (c) When there are more than 64 units per complex. Chapter 8 -System Design -amended Table 8-4.4(a) Pressure Losses in psi/ft. for Schedule 40 Steel Pipe(C=120) and Table 4-4.3(c) Equivalent length of Fittings and Valves for Schedule 40 Steel Pipe in Feet is deleted. Notes: 1. All service connections (except fire service connections) shall be made downstream of the restriction in the domestic service line. 2. The one-half inch restrictor and both Tees shown on this drawing shall be on the outside of the house and shall be visible from the street unless a letter of exemption is on file with the City of Livermore Fire Prevention Bureau. 3. Sizes of piping may vary per plans. Size of restrictor shall always be 1/2 inch. 89