14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

THE CITY OF Chapter 5 — =� SB X7-7 Baselines, Targets, and 2020 Compliance PLEASANTON. calculated over a 10 -year period. In its 2015 UWMP, the City selected a 10 -year baseline period from 1996 through 2005. This is the same 10 -year baseline period reported in the City's 2010 UWMP. SB X7-7 and DWR provided four different methods for calculation of an urban water retailer's 2020 target. Three of these methods are defined in Water Code Section 10608.20(a)(1), and the fourth method was developed by DWR. The 2020 water use target may be calculated using one of the following four methods: • Method 1: 80 percent of the City's base daily per capita water use; • Method 2: Per capita daily water use estimated using the sum of performance standards applied to indoor residential use; landscaped area water use; and commercial, industrial, and institutional uses; • Method 3: 95 percent of the applicable State hydrologic region target as stated in the State's April 30, 2009, draft 20x2020 Water Conservation Plan; or • Method 4: An approach that considers the water conservation potential from: 1) indoor residential savings, 2) metering savings, 3) commercial, industrial and institutional savings, and 4) landscape and water loss savings. The City selected Method 1 to calculate its 2020 target in its 2015 UWMP. Daily average water use is divided by the service area population to obtain baseline and target GPCD. In 2015, the City adjusted its baseline and target GPCD to reflect its updated population estimates based on 2010 Census data results. To calculate the City's compliance year GPCD and compare it to the 2020 target, the population is updated to reflect population estimates for 2020. Details of determining the 2020 service area population are provided in Section 5.3. The City's baselines and targets are summarized in Section 5.5. The City's 2020 compliance water use is provided in Section 5.6. 5.3 SERVICE AREA POPULATION To calculate its compliance year GPCD, the City must determine the population that it served in 2020. At the time of preparation of this UWMP, the 2020 Census results were unavailable; thus the City's 2020 population must be estimated. The City is a "Category 2" water supplier, meaning its distribution area overlaps with less than 95 percent of city boundaries, and it has an electronic geographic information system (GIS) map of its distribution area. DWR's Methodologies states that Category 2 water suppliers can estimate their service area populations using information from a water wholesaler, provided the information was developed using a per -connection methodology that uses population data from the CA Department of Finance (DOF) or the US Census Bureau. To estimate its 2020 service area population, the City started with US Census Bureau estimates for 2019 (the most recent year available) and adjusted it on a persons -per -connection basis. Specifically, the City used the US Census Bureau's American Community Survey (ACS) 1 -Year Data Profiles as a starting point. Since this population estimate is for 2019 and within City limits, it required updating for growth in 2020 and water service areas outside City limits (i.e., Remen Tract, Happy Valley, and the area west of Foothill/Sunol). The City provided the number of residential connections added in 2020 and the number WEST YOST 5-2 City of Pleasanton 2020 Urban Water Management Plan N-680-60-20-04-WP-R-680-2020UWMP May 2021