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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. R5-2015-0012 WASTE DISCHARGE REQUIREMENTS GENERAL ORDER FOR IN-SITU GROUNDWATER REMEDIATION AND DISCHARGE OF TREATED GROUNDWATER TO LAND The California Regional Water Quality Control Board, Central Valley Region, (hereafter Regional Water Board) finds that: On 6 December 2008 the Regional Water Board adopted General Order No. R5-2008- 0149, General Order for In-Situ Groundwater Remediation at Sites with Volatile Organic Compounds, Nitrogen Compounds, Perchlorate, Pesticides, Semi-Volatile Compounds, Hexavalent Chromium and/or Petroleum Hydrocarbons. Between 2008 and 2014, over 50 Notices of Applicability (NOA) were issued for coverage under Order R5-2008-0149. It was apparent that some improvements to the order were warranted. The significant improvements consist primarily of additions to the pollutants covered under the order, specifying effluent limitations if an ex-situ treatment system is utilized, adding discharge of treated groundwater as part of a pump and treat system, and incorporating several modifications to the monitoring and reporting program to increase its functionality and versatility. Order R5-2008-0149 and the NOAs issued pursuant to that Order are still in effect. No additional NOAs will be issued under that Order. The Order will be proposed for rescission once all of the projects under that Order are completed and the NOAs issued have been terminated. This updated version of the Order is not more restrictive to the projects covered under Order No. R5-2008-0149 and thus it is not necessary to enroll them under this Order. Pursuant to Section 13263, subdivision (i) of the California Water Code (CWC), the Regional Water Quality Control Board may prescribe general waste discharge requirements (WDRs) for discharges produced by similar operations, involving similar types of wastes, and requiring similar treatment standards. Discharges of volatile organic compunds (VOCs), perchlorate, nitrogen, pesticides, semi- volatile compounds, hexavalent chormium, sulfate and petroleum hydrocarbons have degraded groundwater at numerous sites within the Central Valley Region and cause or threaten to cause pollution or nuisance and adversely affect existing and potential beneficial uses of groundwater resources. Remediation of groundwater at these sites includes the use and application of in-situ biological, chemical, and/or physical treatments to degrade pollutants, or change them to less toxic or less mobile forms. In-Situ remediation processes include adding amendments to create oxidizing or reducing conditions in the groundwater. Examples of such amendments include oxygen, alcohols, sugars, permanganate, ozone and lactate. Amendments may also be added to enhance bacteria populations. Examples of those amendments include nutrients (phosphorous,