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Mr. Grubstick said no. He believed the construction technique that was used to <br />try and consolidate the ground adjacent to the trench was poor, especially in the open <br />ground areas. He mentioned that the contractor was pulling the shields up and trying to <br />pour the slurry, while trying to compact it at the same time. <br /> <br /> Ms. Ayala asked how many open ground areas there were along the entire stretch <br />of Vineyard Avenue? <br /> <br /> Mr. Gmbstick was not sure what had occurred in Livermore, but in Pleasanton, <br />the open ground areas are on the Vineyard Avenue side to the Fire Station and then over <br />to the new Vineyard alignment. At the westerly end of the new Vineyard alignment, the <br />open ground areas go back into the street section and continue down the street. This is <br />more of a conventional type of construction where the pipeline is placed in the street. He <br />reported that staff has informed Livermore of what it discovered, and Livermore is <br />looking into the matter. <br /> <br /> With a project of this size, Ms. Ayala believed there had to be someone who had a <br />specialty with the inspection aspect of this project. As much as she wanted to get the <br />roadway completed, the safety factor was more important than hurrying and completing <br />the project. She believed this technique was new and asked if there were qualified <br />contractors? <br /> <br /> Mr. Gmbstick reported that the duct bank construction was not a new technique. <br />What was new about this project was the necessity for the slurry backfill above the actual <br />concrete duct bank where the 230kV lines are running. He pointed out that staffis not <br />used to pulling forms up to create the slurry above the duct bank, which normally are <br />filled in with a fine fill material. <br /> <br />Ms. Ayala stated that this was of great concern to her. <br /> <br /> Mr. Wilson pointed out that injection grouting is not a new method and has been <br />used in other projects where there have been similar issues with voids. <br /> <br />Ms. Ayala asked if this was the best way to do the repair work? <br /> <br />Mr. Wilson said yes. <br /> <br /> Mr. Brozosky asked if there had been any testing done with the slurry method <br />injection? He believed the slurry was for heat dissipation, and asked if the injection <br />would affect the other properties? <br /> <br />Mr. Grubstick said no. <br /> <br /> Mr. Brozosky asked staff if it felt confident that it was not any different than the <br />dirt? <br /> <br />Pleasanton City Council 27 02/03/04 <br />Minutes <br /> <br /> <br />