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contractor shall insure that the mower is clean so that no roots, stolons, seeds or crowns of foreign grasses are introduced. All litter and debris in turf areas shall be picked up and disposed of properly. Litter and debris shall not be allowed to accumulate but shall be picked up and disposed of a minimum of once per week. The Contractor shall accomplish such litter and debris pickup prior to mowing to avoid shredding and dispersal of these materials. Fertilization shall be with a slow release, non water-soluble, high nitrogen fertilizer. Chemical composition shall be approved by the City prior to application. All excess chemicals shall be cleaned from benches, tables, BBQs, and pathways. Prior to lawn fertilization with granular-type fertilizers, the Contractor shall ensure that the root zone of the turfgrass is damp and that the grass itself is free of surface moisture. Lawns shall be watered immediately after fertilization to prevent burning the grass. Weed & feed, fertilization and aeration shall be done within 30 days of the City's request. Irrigation System Maintenance The City shall be responsible for all maintenance of the irrigation system including piping, wiring, spray heads, electric valves, and automatic controllers. All irrigation parts and materials which are damaged or broken shall be reported to the City. Upon request, Contractor shall then submit in writing a written proposal for repair and/or replacement. A City representative shall then determine if work shall be done by Contractor or a City crew. Contractor is responsible for any damage caused by Contractor. For any repair work performed by the City, which is at fault by the Contractor, shall be charged against the Contractor's monthly account (Contractor shall have opportunity to perform repair first). No modifications may be made to the existing automatic irrigation system without express approval of the City. Weed Control (Other than Turf) All areas within the work sites are to be kept free of weeds and volunteer tree growth. This includes but is not limited to, all bare dirt areas and any weed growth within ground cover and shrub plantings. Pedestrian walkways and other hardscaped areas are to be kept weed-free at all times. Volunteer tree growth shall be removed by the Contractor as part of this contract. The Contractor shall comply with all rules, regulations, and license requirements of the California Department of Pesticide Regulation, the Department of Health, the Department of Industrial Relations and all other agencies which govern the use of pesticides required in the performance of work on the Contract. Spraying 1. The Contractor shall perform spraying on City properties to prevent weed growth. Spraying shall consist of (1) use of apre-emergent herbicide to prevent weed growth during the NPSA 50016-Citywide Turf Pacheco Brothers Page 17 of 30