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MONITORING AND REPORTING PROGRAM No. R5-2013-0122 MRP-7 <br /> GENERAL ORDER FOR EXISTING MILK COW DAIRIES <br /> shall be conducted at the frequency and for the parameters specified in Table 4 <br /> below. The frequency of monitoring the domestic and agricultural supply wells for <br /> ammonium nitrogen and total dissolved solids may be reduced to every five years <br /> after two years of data are provided to the Executive Officer. <br /> Table 4. GROUNDWATER MONITORING <br /> Domestic and Agricultural Supply Wells <br /> Annually: <br /> Field measurements of electrical conductivity and ammonium nitrogen'. <br /> Laboratory analyses of nitrate-nitrogen. <br /> Every five years (may be distributed over a 5-year period by sampling 20% of the wells <br /> annual) : <br /> Laboratory analyses for general minerals (calcium, magnesium, sodium, bicarbonate, <br /> carbonate, sulfate, chloride, and total dissolved solids). <br /> Subsurface(Tile) Drainage System <br /> Annually: <br /> Field measurements of electrical conductivity and ammonium nitrogen'. <br /> Laboratory analyses of nitrate-nitrogen, total phosphorus, and total dissolved solids. <br /> If field measurement indicates the presence of ammonium nitrogen,the discharger shall collect a sample for <br /> laboratory analysis of ammonium nitrogen. <br /> 1. Groundwater samples from domestic wells shall be collected from the tap <br /> nearest to the pressure tank (and before the pressure tank if possible) after <br /> water has been pumped from this tap for 10 to 20 minutes. If the sample <br /> cannot be collected prior to a pressure tank, the well must be purged at least <br /> twice the volume of the pressure tank. Groundwater samples from <br /> agricultural supply wells shall be collected after the pump has run for a <br /> minimum of 30 minutes or after at least three well volumes have been purged <br /> from the well. Samples from subsurface (tile) drains shall be collected at the <br /> discharge point into a canal or drain. <br /> 2. Additional groundwater monitoring requirements are specified in Attachment <br /> A to this Order. <br /> General Monitoring Requirements <br /> 1. The Discharger shall comply with the additional groundwater monitoring <br /> requirements specified in Attachment A to this Order either through individual <br /> groundwater monitoring or by participation in a Representative Monitoring <br /> Program as laid out in Attachment. <br /> 2. The Discharger shall comply with all the "Requirements Specifically for <br /> Monitoring Programs and Monitoring Reports" as specified in the Standard <br /> Provisions and Reporting Requirements. <br />