In addition, the project was further delayed because the general contractor replaced the subcontractor who installed the original field, he said.
Soon after the field was opened in March, the district discovered "irregularities" affecting its levelness. An analysis pinpointed improper drainage detail installation, and the use of incorrect base soil underneath the synthetic field, Mr. Sheikholeslami said.
The most recently discovered problem, he said last week, is the result of improper grading and leveling of the field's subbase.
Superintendent Maurice Ghysels said earlier this month that the contractor, Richmond-based Overaa Construction, will be responsible for the repair costs.
But that doesn't mean the district might not be out of pocket to some degree because of the work deficiencies. Although the district is currently focusing on getting the job done, Mr. Sheikholeslami said, after the work is completed he will look at possible reimbursement for the cost of the district's extensive analysis of the field's problems and other ancillary costs associated with the project.
"We're tracking all costs," he said.
The school board in June approved an additional $50,000 payment to the firm overseeing the project, Concord-based RGM & Associates, which will continue its oversight. When asked why the firm should be paid additional money when the original work it oversaw was found to be seriously flawed, Mr. Sheikholeslami said that, with projects of this nature, "you can't always catch every little thing" as the work progresses.
Meanwhile, the district has notified the city of Menlo Park, which shares the field during non-school hours, about the field's delayed completion. The city will have to adjust its after-school programs to compensate for Hillview field's unavailability for the first few weeks of school, Mr. Sheikholeslami said.
Last Friday, Mr. Sheikholeslami sent an announcement to neighbors of the Menlo Park school, saying that crews will be adding Sundays to their work schedule, with the goal of completing the project by Sept. 6.
Saturday and Sunday work hours are limited to 9 a.m. to 5 p.m., he said. Weekday work hours are 8 a.m. to 6 p.m.
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