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General Order R5-2015-0012-044 - 3 - 26 July 2018 The Transmission Store San Joaquin County There are 22 existing monitoring wells associated with this Site: 16 monitoring wells and 9 remedial wells. The Monitoring and Reporting Program, incorporated with this permit, requires monitoring and sampling of 4 of the 16 existing monitoring wells associated with the UST investigation and cleanup. Monitoring and reporting of remaining Site wells is under the direction of the Central Valley Water Board. No additional construction of groundwater monitoring wells is needed or anticipated at this time. The proposed injection well ISCO-1 was proposed and approved as part of the injection project, and was installed 12 June 2015. Mr. Donald Rodgers (the Discharger) will be responsible for conducting groundwater sampling, and reporting of the results as described in the attached Monitoring and Reporting Program Order No. R5-2005-0012-014. AGE submitted a Contingency Plan in the Addendum. AGE proposes that if concentrations of deleterious byproducts in compliance zone wells exceed action levels, listed below, that they will cease injection, and suspend all future injections until further comment and approval from the Central Valley Water Board. Additionally, AGE will alter the monitoring frequency to a monthly schedule, and will pump all monitoring wells showing negative effects in bulk until concentrations decrease below action levels. The Contingency Plan to address any unforeseen negative impacts is as follows: The following wells are classified as compliance wells: MW-4S, MW-4R, and AMW-6 (ARCO). For the purposes of this Contingency Plan, action levels are established in the table below. Action levels are based on a 20% increase over naturally occurring background concentrations. However, if a constituent's background concentration exceeds the water quality objective (WQO), the Action Leve is the background concentration. Action levels are shown in the table below. The Transmission Store - Action Levels Constituent Maximum Background Concentration (ug/L) WQO (ug/L) Action Level (ug/L) Arsenic 14 10 14 Bromate 6,400 10 6,400 Chromium, total <10 50 12 Chromium, hexavalent <0.2 10 10 Iron 686 300 686 Manganese 1,010 50 1,010 If water quality concentrations exceed action levels in compliance wells, the injection will cease, planned future injections will be suspended, and the frequency of sampling will be increased to monthly. If concentrations continue to exceed action levels after two consecutive monthly sampling events, AGE will initiate groundwater batch extraction. AGE will recommend contingency extraction wells based on the location of exceedance(s) and concentrations in treatment and transition zone wells. Groundwater batch extraction will continue until concentrations in compliance wells reduce to less than action levels. AGE will collect monthly samples to determine if concentrations in