The small sinkhole on the eastbound lane of Highway 126 has been repaired. Thursday, about noon, work on the hole had significantly obstructed traffic. CalTrans excavated two exploratory trenches without discovering the cause. The trenches were filled with concrete Saturday and traffic returned to normal. Speculation surfaced that perhaps the sinkhole was caused by a void in fill dirt remaining from storm drain excavation beneath Highway 126 several years ago. However the cause of the problem remains unsolved.