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Information Sheet IS-31 Reissued Waste Discharge Requirements General Order R5-2013-0122 Existing Milk Cow Dairies includes, but is not limited to, analyses for a wider array of constituents and chemical isotopes. Within six years of initiating sampling, or at an earlier date if required by the Executive Officer, a Discharger conducting individual sampling is required to submit a summary report that presents a detailed assessment of the monitoring data to evaluate if site activities associated with the operation have impacted groundwater quality. The Summary Report is subject to Executive Officer approval and must include a description of changes in management practices or activities if the data indicate that Groundwater Limitation D.1 of the Order has been violated. Representative Monitoring Program:As an alternative to installing monitoring wells on an individual basis, dischargers may participate in a Representative Monitoring Program. The Representative Monitoring Program is a data collection and analysis effort that will develop a knowledge base from a subset of Central Valley dairy farms that will support conclusions with respect to existing management practices and their ability to be protective of groundwater quality that are applicable to non-monitored dairies covered under the Dairy General Order. It is recognized that a single set of monitoring data, or even monitoring data over a short period of months or years, may not be sufficient to determine the effectiveness of existing practices. In many cases, because of time lags of weeks, months or even years between surface practices and resulting effects in groundwater, the effects of improved management practices will not be reflected immediately in monitoring wells. Evaluating these results over time and in conjunction with data regarding surface practices and other data is necessary to determine whether water quality is being protected or is being unreasonably impacted. In order to provide time for the development of this knowledge base, a period of six years has been allotted for the installation of groundwater monitoring wells, collection and chemical analysis of the groundwater samples, and assembly of an adequate data set for statistical evaluation of the data. The completed knowledge base will be utilized to identify management practices for the various management units (i.e., production areas, land application areas and wastewater ponds) that are protective of groundwater quality for the range of conditions found at facilities covered by the Representative Monitoring Program. Dischargers choosing to participate in a Representative Monitoring Program must notify the Central Valley Water Board. Notification to the Central Valley Water Board must include identification of the Representative Monitoring Program that the Discharger intends to join. Dischargers choosing not to participate in a Representative Monitoring Program will continue to be subject to individual groundwater monitoring program requirements. Representative Monitoring Programs are required to submit a monitoring and reporting workplan for Executive Officer approval. The workplan must explain how data collected at facilities that are monitored will be used to assess impacts to groundwater at facilities that are not part of the Representative Monitoring Program's network of monitoring wells. This information is needed to demonstrate that data collected at the representative facilities allows for identification of practices that are protective of water quality at all facilities represented by the Representative Monitoring Program, including those for which on-site data are not collected. The Monitoring and Reporting Workplan must additionally propose constituents the Representative Monitoring Program will monitor and the frequency of monitoring for each constituent identified. The