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Section 4.7 D shall be modified to read as follows, and Section E and F, shall be added as follows: D. Retrofit Of Existing Systems This applies to an existing fire protection system which is being modified, extended, or enlarged. Such systems include a modification or extension to an existing network such as (distribution piping, sprinkler heads, control valves, etc. are added to an existing system), or where an additional fire protection system (new feed line, riser, control valve, distribution piping, sprinkler heads, etc.) is added to an existing system. If any of the conditions are met the system will be required to be upgraded to meet minimum standards E. The installation of properly sized assembly may cause an excessive pressure loss in some altered Class 1 and 2 systems. Such loss could make the system noncompliant with NFPA Pamphlets 13 and 14 as adopted. The Responsible Managing Employee shall document to the Approving Authority that reasonable modifications will not compensate for the additional loss. The documentation shall contain a listing of the minimum flow and pressure, headloss summary, desired and calculated sprinkler head output and a summary of the options examined to reduce headloss. For these installations, if not already installed, the existing cross connection control device will be replaced with two check valves in series (one of which can be the alarm valve), each valve meeting AWWA C508-82, UL 312-88, • or UL 193-88, or the latest versions thereof, and equipped with a resilient seating surface. The valves or adjacent piping shall be equipped with a sufficient number of resilient seated test cocks (minimum diameter of one quarter to one-half inch) to determine the effectiveness of each valve (there shall be no leakage past any check valve). Sufficient resilient seated isolation valves - one valve upstream of the valves and one valve downstream of the valves - shall be present or added to the system to permit this testing. F. Existing Systems Existing fire protection systems, which have no single check valves or alarm valves are required to meet the minimum standards for a Class 1 and 2 fire protection system. The minimum protection for cross connection control for existing systems is the same as listed for new systems, except for existing systems which have a minimum of a single check valve. The check valve must have 2 resilient seated test cocks installed, one up stream and one downstream of the valve to determine the effectiveness of the valve. The performance testing of the check valve shall be preformed at intervals predetermined by the Approving Authority. Should a check valve fail during any performance test, it will automatically be subject to upgrade to meet the minimum for protection requirements. 9