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N WASTE DISCHARGE REQUIREMENTS GENERAL ORDER NO, R5-2008-0149 2 IN-SITU GROUNDWATER REMEDIATION AT SITES IMPACTED BY VOLATILE ORGANIC COMPOUNDS, NITROGEN COMPOUNDS, PERCHLORATE, PESTICIDES, SEMI-VOLATILE COMPOUNDS, HEXAVALENT CHROMIUM AND/OR PETROLEUM HYDROCARBONS 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. 5 . The materials 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, and petroleum hydrocarbons. 6. 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 . 7. The addition of materials to remediate groundwater may require bench-scale and/or small- scale pilot testing prior to design and implementation of full-scale remediation . The addition of amendments to conduct pilot studies is also covered under this Order. REGULATORY CONSIDERATIONS 8 . The Water Quality Control Plan, Fourth Edition, for the Sacramento and San Joaquin River Basins, Fourth Edition (hereafter Basin Plan) designates beneficial uses , establishes water quality objectives (WQOs) , contains prohibitions , contains implementation plans and policies for protecting waters of the basin , and incorporates by reference plans and policies adopted by the State Water Resources Control Board (State Water Board) . Pursuant to ¶ 13263(a) of the California Water Code (CWC) , waste discharge requirements must implement the Basin Plan . 9 . The designated beneficial uses of underlying groundwater include , but are not limited to: a . Municipal and domestic water supply (MUN) ; b. Agricultural water supply (AGR) ; C. Industrial service supply (IND) ; and d . Industrial process supply (PRO) . 10 . The Basin Plan establishes numerical and narrative water quality objectives for surface water and groundwater within the basin , and recognizes that water quality objectives are achieved primarily through the Board's adoption of waste discharge requirements and enforcement orders . Where numerical water quality objectives are listed , these are limits necessary for the reasonable protection of beneficial uses of the water. Where compliance with narrative water quality objectives is required , the Board will , on a case-by-case basis ,