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It was moved by Ms. Ayala, seconded by Ms. Hosterman, to direct staff to continue to work closely with the Spotorno family to devise an acceptable development plan that would allow for the early construction of that portion of the bypass road that is on the Spotorno property, but in the meantime, direct staff to have conservations with the Dale Way property owners that would give the City a backup plan if necessary. The roll call vote was as follows: AYES: Councilmembers - Ayala, Brozosky, Campbell, Hosterman, and Mayor Pieo NOES: None ABSENT: None ABSTAIN: None 6_~c Update regarding New Vineyard Avenue Construction (IR 04:004) Mr. Wilson presented the staffreport. Mayor Pico asked why there had been a failure with the installation of PG&E's transmission line? Mr. Grubstick reported that the 230kV line mas from Livermore through the Vineyard Corridor, down Vineyard Avenue to Bernai Avenue. There it takes a right hand turn and goes under the Arroyo del Valle to the substation. The areas where staffhas observed subsidence are around the new Vineyard alignment. During construction, PG&E hired Kleinfelder Inc., a geotechnical consultant firm, to prepare inspection reports in that area. The City's inspectors were inspecting the entire length of the construction, including the undercrossings of the Arroyo del Valle, and the work that was being conducted in the street area. Staff did spot inspections along the new Vineyard alignment as it was being constructed. Staff anticipated this would be the simplest work because it was not in an existing sweet, and because PG&E had whatever controls it needed in the new Vineyard alignment. He noted that above the concrete encased conduit is a slurry mix, which gets poured above the slurry mix for heat dissipation. As the contractor was pulling its forms to create the slurry mix above the conduit, a void was left along the sides of the trench and small equipment was needed to compact it. Staff has looked at Kleinfelder's reports and noticed areas where Kleinfelder identified poor compaction, in that it did not reach the 90 percent compaction that the specifications called for. The contractor was to go back and recompact those areas. City staffdid not catch it and neither did Kleinfelder. The wet weather led to a natural consolidation of this material that created the subsidence. He believed it was a combination of contributing factors, including using a technique that staff was not familiar inspecting. Staff anticipated that the specialty inspector, as hired by PG&E to protect its interests, would have caught these poorly compacted areas, which should have been corrected. Mueller Pipeline appeared to be surprised that these areas had subsided and have taken Pleasanton City Council 25 Minutes 02/03/04