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The developer has indicated that the invert elevation of the existing 36" culvert is 956.7 ft. The invert <br />of the upstream end of the new 18 ” culvert shall be at the same elevation as the invert of the existing <br />36" culvert. This invert elevation should be confirmed in writing and not allowed to be changed in <br />the future without input and approval of the DNR, Trails & Waterways Unit. Written documentation <br />will also be required to identify the party or parties responsible for maintaining the proposed water <br />drainage structures. We request that the agreement for the maintenance of the drainage structures be <br />between the DNR and the City of Orono, even if the City of Orono requires the homeowners <br />association to maintain the structure. <br />DNR, Trails & Waterways Unit requires inspection authority on the drainage structures and horse <br />trail treadway construction. A minimum of two week advance notice of construction dates will be <br />necessary to alert trail users of trail construction activity. The developer will be responsible for <br />signing and taking precautions to protect the tr^ users fi'om harm during construction of the drainage <br />structures and horse trail treadway and all restoration work along the trail.