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Information Sheet IS-32 Reissued Waste Discharge Requirements General Order R5-2013-0122 Existing Milk Cow Dairies Monitoring and Reporting Workplan must propose a list of constituents that is sufficient to identify whether activities at facilities being monitored are impacting groundwater quality, and by extension if other"represented"facilities may also be impacting groundwater quality due to similar management units and site conditions. To date, the Central Valley Diary Representative Monitoring Program (CVDRMP) submitted a Phase 1 workplan to establish a Representative Monitoring Program. On 9 September 2012, the Executive Officer conditionally approved the first phase of the CVDRMP Monitoring and Reporting Workplan and Monitoring Well Installation and Sampling Plan for Existing Milk Cow Dairies. The workplan prepared by the CVDRMP consisted of 18 dairies and 126 dedicated monitoring well sites. Of these well sites, CVDRMP constructed 108 as nested wells (i.e., two wells in one borehole) with the remaining 18 well sites being pre-existing, single-well facilities, for a total of 234 wells. On 6 June 2012 the CVDRMP submitted a Phase II workplan (approved by the Executive Office on 27 August 2012) which expanded the program's monitoring efforts to incorporate 24 additional dairies, including several dairies with numerous pre-existing monitoring wells that have been subject to academic research for many years. CVDRMP now collects data from monitoring wells at 42 Central Valley dairies from Tehama County in the north to Kern County in the south, with 440 wells at 274 well sites. As part of its Representative Monitoring Program, CVDRMP will examine conditions in first encountered groundwater beneath a select number of Central Valley dairies over time. The Representative Monitoring Program will extrapolate monitoring results from dairy farms monitored under the program to non-monitored member dairy farms to evaluate dairy operations and management practices for specific waste management units (land application areas, production areas, and wastewater ponds), to facilitate the evaluation of cause and effect relationships between subsurface loading of nutrients and salts, and to establish current groundwater quality conditions. For example, dairy management practices on coarse- grained/sandy soils over shallow groundwater that result in groundwater quality improvements beneath cropped manure application fields that are part of the Representative Monitoring Program are expected to produce similar results beneath non-monitored fields of similar soil types, in areas of similar precipitation patterns, and similar application practices. The same rationale applies to the production area and the liquid manure (i.e., wastewater) storage ponds. Representative monitoring is designed to identify a causal link between groundwater chemical characteristics and dairy management practices specific to management units. This includes the identification of groundwater chemical changes in response to changing management practices. The Representative Monitoring Program is required to submit (on behalf of its member Dischargers) to the Executive Officer an Annual Representative Monitoring Report (ARMR) which describes the monitoring activities (including a tabulated summary of groundwater analytical data) conducted by the Representative Monitoring Program, and identifies the number and location of installed monitoring wells and other types of monitoring devices. Within each ARMR, the Representative Monitoring Program must evaluate the groundwater monitoring data to determine whether groundwater is being impacted by activities at facilities being monitored by