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Information Sheet IS-27 Reissued Waste Discharge Requirements General Order R5-2013-0122 Existing Milk Cow Dairies drainage from outside of the dairy away from manured areas unless such drainage is fully contained; not apply manure and process wastewater closer than 100 feet to vulnerable pathways (e.g., down gradient surface waters, well heads) unless there are sufficient vegetated buffers or physical barriers; and, not use unlined ditches, swales or earthen-berm channels to store process wastewater, manure or tailwater. Pond Specifications: The Dairy General Order includes requirements that all ponds must be verified by an engineer to have adequate capacity and structural integrity to hold generated process water and precipitation. Specifically, the level of waste in retention ponds shall be kept a minimum of two feet from the top of each aboveground embankment and a minimum of one foot from the ground surface of each belowground pond. All ponds must be managed and maintained to prevent breeding of mosquitoes and other vectors. Ponds shall not have small coves and irregularities around the perimeter of the water surface. Weeds shall be minimized in all ponds through control of water depth, harvesting, or other appropriate method, and dead algae, vegetation, and debris shall not be allowed to accumulate on the water surface. New or Reconstructed Pond Specifications: New or Reconstructed Ponds must be designed to meet specified Tier or 1 or Tier 2 standards and design for such New or Expanded Ponds must be approved by the Executive Officer. Tier 1 standards consist of a double liner constructed with 60-mil high density polyethylene or material of equivalent durability with a leachate collection and removal system. Tier 2 standards are consistent with Natural Resource Conservation Service Practice Standard 313 or equivalent and the Discharger has demonstrated through submittal of technical reports that the alternative design will comply with the groundwater limitations of this Order. Existing Pond Specifications: In addition to the general pond specifications, ponds in existence as of 3 May 2007 must be evaluated to determine whether they are protective of underlying groundwater. This will be accomplished through compliance with an individual monitoring program or by participation in the Representative Monitoring Program. When existing ponds are found not to be sufficiently protective of underlying groundwater, a dairy must upgrade the pond in accordance with the time schedule for compliance detailed in section M. of the reissued Dairy General Order. Alternatively, if groundwater monitoring demonstrates that a discharge of waste threatens to exceed a water quality objective, the Executive Officer may issue an order to the owner/operator of the monitored dairy to identify and implement management practices that are protective of groundwater quality on a schedule that is as short as practicable (reissued Dairy General Order, General Specification B.5). Production Area Specifications: The production area includes the barns, corrals, milk parlors, manure and feed storage areas, process water conveyance facilities and any other area of the dairy facility that is not the land application area or retention ponds. The General Order includes a number of requirements that apply to the production area, including: roofs, buildings, and non- manured areas within the production area shall be constructed and/or designed so that clean rainwater is diverted away from manured areas and waste containment facilities; drainage from the roofs of barns, milk houses, or shelters shall not drain into corrals unless the corrals are