14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

Chapter 6 Water Supply Characterization THE CITY OF PLE ASANTON. Kern County Groundwater Banks Storage and Withdrawals 140,000 - 111111111111111I Semitropic 120,000 100,000 L 3 80,000 w a 60,000 m LL 40,000 u Q 20,000 C 116,075 -20,000 - 0 1 00 M O r -I N m -Zr M to n W 0) O .--I N On M to r, 00 Ol O Ol Ql O O O O O O O O O O ci ci ci ci ci cH ci cH cH cH N O1 c -I cH Q1 O O O O O O O O O O O O O O O O O O O O O N N N N N N N N N N N N N N N N N N N N N Figure 6-1. Kern County Groundwater Banks Operations 6.2.1.2.4.1 Semitropic Water Storage District Zone 7 originally acquired a storage capacity of 65,000 AF in the Semitropic groundwater banking program in 1998. Subsequently, Zone 7 agreed to participate in Semitropic's Stored Water Recovery Unit, which increased pumpback capacity and allowed Zone 7 to contractually store an additional 13,000 AF. Zone 7 currently has a total of 78,000 AF of groundwater banking storage capacity available to augment water supplies during drought and emergency conditions and as needed. Zone 7 can store up to 5,883 AFY in the Semitropic groundwater bank. Note that a 10 percent loss is associated with water stored in Semitropic. Under the contract terms, Zone 7 can request up to 9,100 AF of pumpback and up to 8,645 AF of exchange water. Pumpback is water that is pumped out of the Semitropic aquifer and into the SWP system. Exchange water is water that is transferred between Zone 7 and Semitropic by adjusting the amounts of Table A water delivered to Zone 7 and Semitropic; the availability of this type of water depends on the SWP allocation. During the recent drought, Zone 7 was able to recover 9,900 AF in 2014 and about 12,800 AF in 2015. Zone 7 has largely been storing water in Semitropic over the past few years but did recover 324 AF in 2016 and 1,000 AF in 2020. 6.2.1.2.4.2 Cawelo Water District Similar to the arrangements with Semitropic, Zone 7 has 120,000 AF of groundwater banking storage capacity available with Cawelo, as executed in a 2006 agreement. Zone 7 can store up to 5,000 AFY in the bank and can request up to 10,000 AFY of pumpback (or SWP exchange water) from Cawelo. During the recent drought, Zone 7 was able to recover 10,000 AF, delivered evenly over 2014 and 2015. Most of this water was used directly, while the rest was stored in San Luis Reservoir for use the following year. Zone 7 only accumulates 50 percent of the water sent to storage in Cawelo; the other 50 percent goes towards water loss and compensation to Cawelo. WEST YOST 6-7 City of Pleasanton 2020 Urban Water Management Plan May 2021