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Zone 7 Water Agency Executive Summary <br />Table ES -8: Summary of Sustainability Indicators and 2019 WY Status <br />Sustainability Indicator <br />Undesirable Results Alt GSP <br />Minimum Threshold Alt GSP <br />Status 2019 WY <br />Action Taken <br />Main Basin was 10' to 160' <br />Increased monitoring of <br />Loss of wellfield or <br />above historic lows in all areas <br />the quarry operations to <br />Groundwater Levels <br />loss of domestic supply well <br />Historic Lows <br />except a limited area <br />prevent undesirable <br />surrounding Lake E due to <br />results <br />mining activities <br />Groundwater Storage <br />Chronic loss of storage <br />Total Storage above 128 TAF <br />Total Storage at 252 TAF, <br />No action needed <br />(Historic Low) <br />(124 TAF above Historic Low) <br />Main Basin avg TDS = 658 mg/L <br />Increase municipal supply <br />pumping, operation of <br />TDS was detected above the <br />MGDP, and artificial <br />TDS >500 mg/L <br />minimum threshold in Mocho <br />Wellfield municipal supply <br />groundwater recharge <br />with low TDS water in <br />wells <br />2020 WY <br />Lower Aquifer degradation <br />NO3 (as N) exceeded threshold <br />Groundwater Quality <br />resulting in wellfield not being <br />NO3 (as N) > 10mg/L <br />in northeastern Mocho II <br />Continue to monitor <br />suitable to provide drinking water <br />Subarea, but overall continues <br />supply <br />to decrease with time <br />Boron exceeded threshold in <br />Boron > 1.4 mg/L <br />two wells in the Mocho <br />Continue to monitor <br />Wellfield up to 3.0 mg/L <br />Chromium threshold wasn't <br />Total Chromium > 0.050 mg/L1 <br />exceeded in any municipal or <br />No action needed <br />lower aquifer wells2 <br />Elastic fluctuations of 0.07' per <br />Land Subsidence <br />Inelastic subsidence <br />Land surface elevation <br />cycle with less than 0.02' for <br />No action needed <br />decrease of 0.4' <br />the year <br />Surface Water- <br />Depletion of surface water in the <br />Elevation 491' in 2S/2E 34E1 <br />Elevation 494.08' in 2S/2E 34E1 <br />Groundwater Interaction <br />Alkali Sink <br />Elevation 501' in 2S/2E 27P2 <br />Elevation 502.62' in 2S/2E 27P2 <br />No action needed <br />1The minimum threshold was changed from CrVI < 0.010 mg/L in the Alternative GSP to Total Cr < 0.050 mg/L after SWRCB rescinded the CrVI MCL in 2017. <br />2One upper aquifer monitoring <br />well in a fringe basin exceeded the threshold. <br />Annual Report for the Sustainable March 2020 <br />Groundwater Management Program 2019 WY ES -8 <br />