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Non-wetland waters: linear feet: width (ft) and/or acres. <br />Wetlands: acres. <br />c. Limits (boundaries) of jurisdiction based on: Not established at this time. <br />Elevation of established OHWM (if known): <br />2. Non-regulated waters/wetlands (check if applicable):3 <br />® Potentially jurisdictional waters and/or wetlands were assessed within the review area and determined to be not jurisdictional. <br />Explain: <br />Mack Wash crossing is an RPW crossing that will be evaluated in the (Part 2) request for conflrmatiou of Wetland Delineation and <br />Jurisdictional Determination. <br />Crossing Points WOll-W019 originate from an irrigation ditch constructed on the upland terrace that runs along the west side of Mack <br />iVlesa. The ditch is no longer functional and has numerous failures along its length. Eroded gullies have developed below <br />many of the failures in the ditch and were not considered to be jurisdictional tributaries. The irrigation ditch was constructed <br />in upland and is not considered to be jurisdictional. <br />Crossing Points V001-060 are points that were considered to be non-jurisdictional due to lack of OHWM. These drainages also lacked <br />evidence of flow and contained perennial and annual vegetation in the drainage bottoms, absence of evidence of flow such as <br />shelving and detritus build up, and lack of connectivity to other waters of the U.S. <br />Crossing Points W002-W111B are drainages that showed some evidence of an OHWM. These drainages were further evaluated for their <br />potential to significantly alter the chemical, biological, or physical properties of down stream TNWs. Info-•mation on these <br />washes is provided in Section III, B-1. The washes within the proposed project impact area have an insignificant and <br />speculative impact on the physical, chemical, and biological integrity of the down stream TNW (Colorado River) or its <br />tributa-°ies. There is no information available to show that these washes: 1) is or could be used by interstate or foreign <br />travelers for recreational or other purposes, 2) produces fish or shellfish which are or could be taken and sold in interstate or <br />foreign commerce, or 3) is or could be used for industrial purposes by industries in the interstate commerce. <br />s Supporting documentation is presented in Section IILF. <br />WestWater Engineering Page 16 of 23 COE Jurisdictional Determination Request <br />DBMS 405 <br />