14 ATTACHMENT 1 EXHIBIT B - Laserfiche WebLink

Zone 7 Water Agency Executive Summary ES.2.2. Surface Water - Groundwater Interaction Ongoing monitoring and management by Zone 7 have supported the maintenance of steady groundwater levels in the Springtown Alkali Sink area, indicating no significant surface water depletion since the late 1970s. Results for 2019 WY indicate that groundwater levels continue to be above the thresholds defined in the Alternative GSP. Zone 7's ongoing Surface Water -Groundwater Interaction Monitoring Program and results for the 2019 WY are described in Section 5, Surface Water -Groundwater Interaction. ES.2.3. Groundwater Levels Zone 7's Groundwater Elevation Monitoring Program includes the measurement of groundwater levels in monitoring and production wells to confirm that management objectives are met, to assess groundwater supplies, and to define any new management objectives needed to achieve sustainability. The program focuses on the Main Basin, where groundwater is pumped for municipal uses. However, water levels are also measured in most of the Fringe Management Areas. Groundwater levels for the 2019 WY followed a typical historical seasonal pattern: rising in the beginning of the water year with rainfall recharge and reduced pumping, levelling off in late spring, and then dropping during the second half of the water year as groundwater demand increased. Compared to the levels at the end of the 2018 WY, groundwater elevations generally varied little in the western portion of the Main Basin and rose in some areas of the eastern portion of the Basin. In general, groundwater elevations remained considerably above the threshold elevations (historic lows). Upper Aquifer water levels in the Mocho II Subbasin rose up to about 21 feet from the 2018 WY because of Zone 7's renewed stream recharge along the Arroyo Mocho. Groundwater levels in the Fringe Management Areas (which only have an Upper Aquifer) stayed relatively constant throughout 2019 WY, varying generally by less than approximately 5 ft. At the end of the water year, groundwater levels in the vicinity of the Bernal Subarea were more than 120 ft above the historic low. In the Amador Subarea, levels were generally 40-100 ft above the historic lows except in the immediate vicinity of two mining excavations that were being dewatered during the water year. Over the majority of the Mocho II Subarea, the end -of -year groundwater levels were 90-150 ft above historical lows. Water levels in the immediate vicinity of Lake E (mining area) have been below the historic low water level of 215 ft mean sea level (msl) since 2012, with no observed undesirable results. The water levels are drawn down in that area due to dewatering by the quarry operator for mining activities. During the 2019 WY, water levels in the area of Lake E were 35 ft below the historic low. Zone 7 continues to monitor the localized impacts of this use for any potential undesirable results. Section 6, Groundwater Elevations, further describes Groundwater Elevation Monitoring Program and results for the 2019 WY. Annual Report for the Sustainable March 2020 Groundwater Management Program 2019 WY ES -9