The Los Angeles Department of Water and Power began construction on two 55 MG enclosed reservoirs to protect drinking water that is currently stored in the open Silverlake and Ivanhoe reservoirs. The project needed to comply with EPA regulations which would hold a total water storage of 110 million gallons. The first reservoir (East) was completed in 2014 that led to shrinkage crack concerns, especially with the on-going drought in California . It was imperative that no water was lost due to leakage. When the first reservoir was completed, it resulted in 20,000 gallons of water loss per day. LADWP decided to use PREVent-C technology to improve their East Reservoir. They created roof deck slabs that included 5% PREVent C admixture that showed no shrinkage cracks. With great improvement, PREVent-C is being considered to be part of the West reservoir.