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WASTE DISCHARGE REQUIREMENTS GENERAL ORDER NO. R5-2015-0012 IN-SITU GROUNDWATER REMEDIATION AND DISCHARGE OF TREATED GROUNDWATER TO LAND The injected chemical itself may leave residuals of its constituent components, as well as cause changes in groundwater chemistry that liberate metals found in the formation geo- materials. Background/baseline concentrations of metals and total dissolved solids will be established pursuant to the attached Monitoring and Reporting Program. The applicable WQ0s are the narrative toxicity objective, Primary and Secondary Maximum Contaminant Levels, and the narrative taste and odor objective as found in the Basin Plan. Numerical limits in this Order implement those WQ0s. The following Table presents the numerical WQ0s for potential waste constituents of concern at the site: Constituent WOO Reference trichloroethene 0.8 pg/L California Public Health Goal tetrachlorethene 0.06 pg/L California Public Health Goal vinyl chloride 0.05 pg/L California Public Health Goal cis 1,2-dichlorethene 6 pg/L Primary Maximum Contaminant Level 1,2-dichlorethene 10 pg/L Primary Maximum Contaminant Level 1,2-dichloroethane 0.4 pg/L California Public Health Goal 1,1-dichloroethene 6 pg/L Primary Maximum Contaminant Level 1,1-dichloroethane 3 pg/L California Public Health Goal 1,2,3-trichloropropane 0.0007 pg/L Draft California Public Health Goal 1,2-dichloropropane 0.5 pg/L California Public Health Goal 1-chloropropane 280 pg/L IRIS propene 28 pg/L Taste and Odor , iron 300 pg/L Secondary Maximum Contaminant Level manganese 50 pg/L Secondary Maximum Contaminant Level hexavalent chromium 10 pg/L California Maximum Contaminant Level total chromium 50 pg/L Primary Maximum Contaminant Level total dissolved solids 500 mg/L Secondary Maximum Contaminant Level sulfate 250,000 pg/L Secondary Maximum Contaminant Level sodium 20,000 pg/L USEPA Health Advisory bromate 10 pg/L Primary Maximum Contaminant Level chloride 106,000 pg/L Agricultural Water Quality Goal — Food and Ag Nitrate-N 10,000 ug/L Primary Maximum Contaminant Level Ammonium 1,500 ug/L Taste and Odor Perchlorate 6 ug/L Primary Maximum Contaminant Level Petroleum Hydrocarbons (gasoline) 5 ug/L Taste and Odor Diesel Oil 100 ug/L Taste and Odor Cyanide 150 pg/L California Maximum Contaminant Level 19. Some amendments used to stimulate degradation of waste constituents in groundwater have a salt component (generally sodium or potassium). Upon completion of the intended degradation process, the salt component remains. The groundwater in the Central Valley is severely degraded by salts and the Regional Water Board is intent on minimizing the discharge of salts to the groundwater. The use of non salt-containing injectants is preferred, and the Discharger is required to demonstrate that there are no non salt- containing injectant alternatives that will cost-effectively promote the degradation of the target constituent before being allowed to use a salt-containing injectant. See Discharge Specification D.3. Furthermore, the Discharger is required to establish background salt concentrations (total dissolved solids) and monitor the groundwater for changes in salt