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BRUNGARDT ENGINEERING January 5, 2018 Mr. Ryan Schmitz, PE Assistant Utility Director — Engineering/Operations City of Grand Island Utility Department City Hall 100 E First Street Grand Island, Nebraska 68801 RE: Review of Pile Driving Related Vibration Study By The Diamond Engineering Company JBS Swift Walkway Bridge Grand Island, Nebraska Dear Mr. Schmitz, The following calculated conclusion for each abutment is stated below: South Abutment. 201800874 The south abutment should have the H piling drilled and/or jetted into the ground for the first 20 linear feet before pile driving begins. The H piling should then be installed using an Impact Hammer until said piling is at the appropriate toe depth. 214 W 42 1111 Street, Suite 11 PO Box 2052 Kearney, NE 68848 Phone 308 -236 -2166 I have reviewed the vibration analysis for pile driving in the attached "Proposed Vibration Mitigation Plan Study" generated by the Diamond Engineering Company for the proposed pedestrian walkway bridge over the canal by the JBS Swift plant. This study was completed to determine the possible effects of both vibratory hammer and impact hammer method of installing both the H piling and sheet piling for the abutments of the pedestrian bridge, The City of Grand Island Utility Department's concern is for a 12 inch ductile iron water main which is approximately five feet (5') from the proposed abutment of the pedestrian bridge. The study was to determine the impact the vibration of the various pile driving operations could have on this water main. The sheet piling for the south abutment will be dug in and a static force applied for seating these sheets with their toe depth 7 lineal feet below the existing water main. North Abutment. The north abutment can have both the H piing and the sheet piling driven with the vibratory hammer since these pilings are significantly away from the existing water main.