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Ayes: Councilmembers Pentin, Brown, Testa, Narum, Mayor Thorne Noes: None Absent: None 20. Approved plans, reviewed proposals and authorized City Manager to award a construction contract to Goodfellow Bros., LLC, Inc. in the amount of $232,072 for urgent roadway repairs on West Las Positas Boulevard, between Hacienda Drive and Stoneridge Drive, for the West Las Positas Boulevard Street Settling Repair Project, CIP No. 11514; authorized Director of Engineering to approve and execute any required contract change order(s) for a not-to-exceed amount of$23,207 Director of Engineering Steve Kirkpatrick presented the plans for Las Positas and reported the road was built in 1985, is 3.5 inches thick atop an aggregate base built above high plasticity silty clay with subgrade lime treated to a depth of 13 to 15 inches for stabilization. He explained there are City-owned water, sewer, and storm drains beneath the pavement. He advised spot maintenance proved necessary soon after construction. Director of Engineering Kirkpatrick reported Las Positas was overlaid in 2007 and sections showed distress again as soon as 2010 and noted maintenance has been required regularly over the past decade. He advised a 2013 investigation recommended excavation of the subgrade and installation of lightweight filling material. He further explained the recent drought has accelerated differential settlement of the silty clay impacting manholes and forcing the edge of the street to drop. Director of Engineering Kirkpatrick explained the short-term plan will include spot paving Las Positas between Hacienda Drive and Stoneridge Boulevard with the work being completed within a month at a cost of approximately $235,000. He reported the long-term plan includes removing the upper four feet of clay and replacing it with select engineering fill which should eliminate the differential settlement issue. He advised implementation would involve soil sampling as an assessment of the condition of utilities beneath the road and a plan would be developed accordingly. Lastly, he advised the process would include obtaining cost estimates, choosing a Geotechnical Engineering Consultant, and a budgeting process with the anticipation of the project costing between six and 10 million dollars. In response to Councilmember Narum's inquiries, Director of Engineering Kirkpatrick stated use of a lightweight concrete utilized a few years ago was just on an isolated area which eventually showed problems melding with the area around it. He confirmed the short-term project would happen within the month and he would return in early 2021 with a more detailed long-term recommendation for the City Council. In response to Councilmember Brown's inquiries, Director of Engineering Kirkpatrick confirmed the removal of trees abutting the shoulder of the road must be evaluated. He explained the weight of a potential bicycle track would not impact a proper repair of the road. Lastly, he expressed a lack of confidence in the condition of the utilities with the amount of movement in the road. He believes the sewer system is intact due to its depth, but the PVC waterline could be compromised and will need evaluation. In response to Councilmember Pentin's inquiry, Director of Engineering Kirkpatrick clarified the area impacted by the project as being all of Las Positas from Hacienda to Stoneridge in both directions but could change slightly after the geotechnical evaluation. Mayor Thorne opened public comment. Richard Schussel inquired whether the larger dips near Stoneridge Drive would be corrected with the short-term repair. He expressed his interest in a long-term fix and hopes it receives top priority in the next budget discussions. City Council Minutes Page 7 of 8 October 6, 2020