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U4. No fuel, oils, solvents, or similar materials are to be disposed of in any catch basins. The Contractor must closely adhere to local, state, and Federal Environmental Protection Agency requirements, and is responsible for all non-compliance penalties. US. The Contractor must have substantial experience in the large scale landscape and irrigation maintenance of parks, public rights-of-way including medians and high traffic roadways. This experience must include a minimum of five years experience in this type of work, including the maintenance of a wethose or similar sub-surface irrigation system. Proof of such shall be required at proposal submittal. U6. Aerial spraying of trees, with the exception of Royal Palms, is prohibited. U7. The Contractor, at his satellite storage facility, must maintain an adequate supply of lumber for bracing of fallen trees. U8. All irrigation lines are to be flushed, cleaned, and maintained monthly, or as required to maintain the required water flow. All valves, controllers, and other components must be maintained on a regular basis at no additional charge. This will include, but not be limited to, the checking of breaks in the lateral lines. All irrigation breaks or malfunctions must be repaired by the Contractor within 24 hours notification by City (including weekends). This includes all vehicular damage to irrigation and/or landscape materials. Furthermore, all damages noticed by Contractor shall be reported to City within 24 hours. U8.1. Requirements for existing irrigation system on Collins Avenue median: L.18.1.1. The Collins Avenue median is irrigated through a 'wethose' subsurface irrigation system supplied by City water meters, with the exception of median island 'bullnoses' which are watered with overhead irrigation. U8.2. Required on-going maintenance as follows: U8.2.1 Monthly - Turn system on with controllers and check program. Adjust program as needed for seasons, new plantings, and weather conditions. Verify that system is running 20 minutes on and 20 minutes off, per cycle, to prevent 'wethose' hydration (decrease leak rate). Suggested frequency of watering (will vary based on rainfall) is 5 cycles per day/5 days per week during dry season and 4 cycles per day/3 days per week during wet season. Visually inspect valves, filters, and backflow preventers for malfunction or damage and repair as needed. With system running, visually inspect for PVC pipe breaks or 'wethose' needing repairs. Always make repairs to all PVC or 'wethose' pipe after flushing the pipe. After repairs are complete, turn the system on to verify that no additional work is required. U8.2.2.Quarterly - In addition to monthly maintenance schedule, open flush ports and let water run a minimum of 3 minutes. Check filter elements for excess residual and replace if needed. U8.2.3.Annually - In addition to monthly maintenance schedule, replace filter elements and controller batteries. Chemically flush system using 'Disolve' (this process will remove iron, calcium, and PAGE 34 OF 105 PROPOSAL No.