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WASTE DISCHARGE REQUIREMENTS GENERAL ORDER NO. R5-2015-0012 2 IN-SITU GROUNDWATER REMEDIATION AND DISCHARGE OF TREATED GROUNDWATER TO LAND nitrogen, potassium) and microbes. The amendments are usually injected into the treatment area or are added to extracted groundwater and recharged into the treatment area followed by extraction in a recirculation mode. The remediation may include extraction and treatment of groundwater, with the discharge of the treated groundwater back to the aquifer, applied to the land surface or injected into the vadose zone.The remediation processes can include groundwater extraction, treatment, and recirculation or discharge of treated groundwater to ground within the area undergoing treatment. For example, amendments may be injected into the treatment zone, or actively circulated through the treatment zone with groundwater recirculation. Treated groundwater may be discharged and further treated by land application. Pollutants other than those listed above, amendments, and treatment processess other than those listed, may also be considered for use under this Order. For those instances the applicability of the technoiogy to the poilutant must be demonstrated, such as in a pilot test. Additional details are supplied in the Information Sheet, attached to this Order. Adoption of general WDRs for the these processes would: a) simplify the application process for dischargers, b) prevent regulatory delays to groundwater remediation activities, c) reduce time needed for Regional Water Board staff to prepare and the Regional Water Board to adopt WDRs for common remedial activities in the Central Valley Region, d) enhance protection of surface water quality by eliminating some discharges of treated groundwater to surface water, and e) provide a comparable level of water quality protection to individual, site-specific WDRs. This Order regulates the use and application of in-situ biological, chemical, and physical treatments to clean up waste constituents in groundwater. The dischargers regulated by this Order are more appropriately regulated by general WDRs than individual WDRs because the Regional Water Board regulates many sites using this type of process, the cleanup of these type of sites is of high priority and the issuance of individual WDRs is time-consuming without providing additional benefit, and the types of treatment used have similar effects that can reasonably be regulated with general WDRs. This Order does not preclude the adoption of individual WDRs where appropriate. The amendments that can be used to remediate groundwater pollution at a site in the Central Valley Region under this Order are limited to those listed in the CONDITIONS OF ELIGIBILITY, listed below. This Order is not intended for use and application of other materials to remediate groundwater pollution or for remediation of waste constituents in groundwater other than VOCs, perchlorate, nitrogen compounds (nitrate, ammonia, etc.), some selected pesticides and semi-volatile organic compounds, sulfate and petroleum hydrocarbons, unless it is demonstrated in a bench test that the technology is likely to be effective on the particular pollutant under site specific conditions. The application of any material to groundwater may result in unintended adverse effects to groundwater quality. To comply with this Order, any potential adverse water quality effects that may occur must be localized, of short-term duration, and may not affect existing or potential beneficial uses of groundwater. Groundwater quality will be monitored before and after addition of any materials to verify both the effectiveness of the remediation and that no long-term adverse affect on beneficial uses of groundwater has occurred.