Lehigh cement quarry, located in Cupertino, received a notice of violation on February 22 from the for dumping millions of gallons of excess water into Permanente Creek. The water may contain contaminants, according to a council memo. Lehigh’s excess water drainage could negatively affect Los Altos by causing extra repairs of storm drain lines, the memo said.
Permanente Creek flows through Los Altos, and through Heritage Oaks
Park, a property which the city of Los Altos owns.
The Santa Clara Valley Water District will also have to periodically remove sediment from the Permanente Creek bed. The extra maintenance will add to the cost of water, according to a council memo.