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Information Sheet IS-38 Reissued Waste Discharge Requirements General Order No. R5-2013-0122 Existing Milk Cow Dairies Table 1. Regional, State, and National Pond Liner Design Requirements Central Valley Water Board Pond Liner Design Requirements Waste Discharge Tier 1 or Tier 2 option: Requirements General Order Tier 1: A pond designed to consist of a double liner constructed with 60-mil high density polyethylene No. R5-2013-0122 or material of equivalent durability with a leachate collection and removal system (constructed in accordance with Section 20340 of Title 27) between the two liners will be acceptable without a demonstration that the pond design is protective of groundwater quality. Tier 2: A pond designed in accordance with California Natural Resource Conservation Service (NRCS) Conservation Practice Standard 313 or equivalent and which the Discharger can demonstrate through submittal of technical reports that the alternative design is protective of groundwater quality as required in General Specification B. 8 of the General Order. Central Valley Counties Pond Liner Design Requirements Kings County The specific discharge (seepage rate) of process water through the soils lining the bottom and sides of the manure separation pits and lagoons shall not be greater than 1 x 10-6 centimeters per second (cm/sec). Merced County Liner shall be designed and constructed with a seepage rate of 1 x 10 cm/sec or less (with no credit for manure sealing) and a minimum thickness of one foot. Solano County Large dairies (700 or more mature dairy cows): Liner placed atop bedrock or foundation materials comprised of(from bottom to top): (1) Two feet of compacted clay with permeability less than or equal to 1 x 10-7 cm/sec, (2) 60 mil high-density polyethylene geomembrane with a permeability less than or equal to 1 x 10-13 cm/sec, (3) Geomembrane filter fabric, and (4) 24-inch thick soil operations layer. Medium sized dairies (200 to 699 mature dairy cows): Liner of compacted clay that is a minimum of one foot thick, with maximum permeability of 1 x 10-6 cm/sec. Small dairies (14 to 199 mature dairy cows): No pond liner requirements.