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forester or person designated by the City Manager. In order to remain responsive to emerging research, the City reserves the right to request a change in formulation rates or application methods for the duration of the contract. Any such change and additional costs incurred would be agreed to in written correspondence between the Contractor and the City. Ash Trees 1) All injections of ash trees must be with a liquid formulation of 4% Emamectin benzoate every two years. No substitutions of the formulations shall be allowed. 2) Contractor shall inject Emamectin benzoate at a variable rate up to but not exceeding 5 ml per diameter inch. Determination of dosage shall be on the inches of diameter at breast height (DBH) within specific diameter classes listed in Attachment (B) and (C). 3) Injections must be made at the root flare to ensure the best distribution of the insecticide throughout the tree. Equipment: Rainbow Treecare will provide all necessary equipment to complete the Work under these specifications: 1) Equipment will remain in proper operating condition throughout the term of the Agreement and RTC is responsible for cleaning and providing upkeep to the injection system on a daily basis. Any maintenance issues or repairs are the sole responsibility of Contractor. 2) Treatment technicians will use a high -helix drill bit and must replace the drill bits after every 100 DBH inches to maintain high efficiency. Drilled holes must be the size recommended by the injection equipment manufacturer. 3) Injection holes on ash must be drilled to a depth of approximately 1 inch below the bark to maximize delivery of Emamectin benzoate into ash trees. 4) Emamectin benzoate will be injected into ash trees using current industry standard injection systems that have efficacy data that supports their use, and follow all manufacturers' specifications. 5) All injected trees must be tagged with the year of injection clearly indicated on the tag. Contractor shall provide tags for all injected trees. The tags must be of a design and type that can persist on the tree for at least 3 years. Property Access and Notification Contractor shall not enter private property without having previously obtained permission from the property owner. If Contractor personnel desire to enter private property to access trees on a City owned property, it is their responsibility to notify the underlying property owner by knocking on the door at the time of the site visit or making a phone call ahead of time. Every