Agenda - Public Works Committee - 07/20/2021

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Public Works Committee Meeting Date: 07/20/2021 Submitted For: Grant Riemer, Engineering/Public Works By: Grant Riemer, Engineering/Public Works Title: Review of Spray Patching on Junkite St/146th Cir Purpose/Background: Purpose: Staff was asked to review the spray patching and the problems that occurred in this area. Timeframe: 5 Minutes 5.2. Observations/Alternatives: Under 2021 street inventory rating system these roads are both rated as 2. This means they have deteriorated to the point where reconstruction is warranted. Over the last several years the public works staff has used spray patching and regular patching to hold this area until it could be reconstructed. With so many potholes, alligator cracking and pavement stripping we attempted to use the spray patcher to cover large areas of pavement. We have done this in the past with success on other road sections, but circumstances this time did not work out as expected. We have been renting spray patching equipment from our current vendor over the past several years with fairly good success, but this year was the exception. We have had numerous breakdowns on the rental equipment that compounded our problems in this area. 6/11-6/15 Conveyor needed replacement 6/23-6/24 Pin replaced on boom and conveyor adjustment 6/28-6/29 Throttle actuator broke 7/1 Computer malfunctioned and needed replacement. At this point we canceled the contract and returned the equipment. Several other factors added to the unsatisfactory condition of the project. We were training in a new operator and all the break downs certainly didn't help his success. An inexperienced operator and high temps led to bleed through in some areas that had to re-covered with extra rock to prevent tracking. With temps in the 90's we left the rock on longer that normal to reduce the chance of bleed through, but even with that a resident tracked emulsion on to their cement driveway. That required a crew of 3 most of a full day to remove. One day a residents irrigation system came on and washed the emulsion into the gutter line before it set up. With the high winds, emulsion drifted and landed on two residents cars that had to be sent in for detailing to remove it. We have changed our method of maintenance on large areas of pavement distress and are now using an asphalt mill on our skid loader and doing small overlays instead. This is a slower process, but provides a good result. Funding Source: N/A Recommendation: To continue with the mill and overlay process of patching until such time the road segment can be overlaid or reconstructed Action: