Lee Valenzuela, a board member with the National Plasterers Council, walks past one of several pools at Cal Poly that are being used in a study to determine the effectiveness of pool covers in reducing evaporation.
Lee Valenzuela, a board member with the National Plasterers Council, walks past one of several pools at Cal Poly that are being used in a study to determine the effectiveness of pool covers in reducing evaporation. jjohnston@thetribunenews.com
Lee Valenzuela, a board member with the National Plasterers Council, walks past one of several pools at Cal Poly that are being used in a study to determine the effectiveness of pool covers in reducing evaporation. jjohnston@thetribunenews.com