14 ATTACHMENT 1 EXHIBIT B - Laserfiche WebLink

Zone 7 Water Agency Executive Summary monitoring natural recharge and demand, limiting excess groundwater pumping by retailers through the use of quotas as well as artificial recharge and adjustments to Zone 7 groundwater pumping. In addition, Zone 7 carefully monitors a series of former quarry lakes, known as the Chain of Lakes (COL), for water storage and groundwater replenishment. Zone 7 was part of a joint effort by the Tri -Valley water agencies, studying the technical feasibility of potable reuse, or purified recycled water, to enhance long- term water supply reliability. In May 2018, the Tri -Valley water agencies completed the Joint Tri -Valley Potable Reuse Technical Feasibility Study. The results showed that potable reuse was technically feasible. The next steps that were identified include a regional water demand study, regional water supply updates, and technical studies regarding the COL and groundwater injection well siting. These, and Zone 7's other groundwater supply management actions, are discussed in Section 12, Groundwater Supply Sustainability. ES.3.2. Water Quality Sustainability Preserving or improving groundwater quality is a key component of sustainable groundwater management. Zone 7 administers four key programs to ensure the protection of groundwater quality: the Water Well Ordinance Program, the Toxic Site Surveillance Program, the Salt Management Plan (SMP), and the Nutrient Management Plan (NMP). During the 2019 WY, 139 drilling permits were issued with groundwater quality protection conditions, and 83% of the permitted work was physically inspected by Zone 7 permit compliance staff. Four new soil and groundwater contamination cases were identified and are being actively monitored and addressed along with 40 other active contamination cases within Zone 7's service area. Eight of these cases are being considered for closure. Zone 7 also continued to implement its SMP and NMP to monitor, assess, reduce, and manage salt and nutrient loading. As part of its strategy to manage salt loading, Zone 7 exported 1,873 tons of salt from the Valley via the MGDP. For nutrient management, Zone 7 has a role in managing On -Site Wastewater Treatment System (OWTS) densities within the Livermore Valley Groundwater Basin and watershed, mainly through the approval process for non-residential (e.g. commercial and industrial) OWTS use authorizations. Additional updates or changes made to these programs during the 2019 WY are discussed in Section 13, Water Quality Sustainability. Annual Report for the Sustainable March 2020 Groundwater Management Program 2019 WY ES -13