e. Contract approval - Laserfiche WebLink

Proposal for Geotechnical Engineering Services Midwest Testing Proposed Bridge Repair—TB1101r�eox�rarrr,INC. Cass County, North Dakota A1rirraconeow August 21, 2014■ MTUTerracon Proposal No. M1140317 2012), further slope stability analysis was conducted at the site due to slope instability along the south abutment of the new bridge. We understand remediation measures were not taken after the submission of this report. Mr. McLaughlin has informed us that the previously studied slope failure is proceeding near the south abutment of the current bridge and that the current proposals for remediation are as follows: o remove and replace the existing south abutment and use a lightweight fill behind the abutment to remove the forces creating the active slope failure or, remove the current south abutment and replace with a pier and extend the bridge at least one more span south. This option will place the new south abutment outside of the current failure zone. 2.0 SCOPE OF SERVICES The project will consist of field exploration and laboratory testing under the guidance of a geotechnical engineer to characterize the subsurface conditions, and geotechnical engineering to develop geotechnical design and construction recommendations. The following sections provide an overview of the work scope for each of these aspects of the project. 2.1 Field Exploration Our field exploration work will include the drilling and sampling of exploratory soil borings. We propose advancing one soil test boring within the active failure zone south of the bridge. This boring will be advanced to approximately 50 feet below the ground surface and be used to evaluate remediation options of the slope failure. Additionally, we propose advancing one soil test boring to a depth of approximately 100 feet below the ground surface. This deeper boring will be advanced near the assumed south abutment of the extended bridge and will be used to evaluate deep foundation options and abutment slope options if the bridge is to be extended outside of the current zone of failure. 2.1.1 Procedures We will locate the soil borings by field measurements, and record the coordinates of the boring locations using a hand-held GPS device which is capable of locating the exploration points within about 20 feet. Elevation of the soil test borings will be measured using a surveyor's level and rod and referenced to a temporary benchmark. The boring coordinates, elevations and temporary benchmark will be included in the Geotechnical Engineering Report. Sampling will be in general accordance with local industry procedures wherein Shelby tube samples or split-barrel samples are obtained. In the 50 foot boring, one split- barrel sample will be taken at 2% foot intervals throughout the boring. While conducting the 100 foot boring, one Responsive ■ Resourceful • Reliable 2