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Information Sheet IS-40 Reissued Waste Discharge Requirements General Order No. R5-2013-0122 Existing Milk Cow Dairies Table 1. Regional, State, and National Pond Liner Design Requirements Natural Resources Conservation Service Pond Liner Design Requirements (NRCS) NRCS Agricultural Waste In-place soils at least two feet thick and maximum permeability of 1 x 10 cm/sec. Management Field Handbook Appendix 10D— Consider liner if: aquifer is unconfined and shallow and/or aquifer is a vital water supply; site underlain Geotechnical, Design, and by less than two feet soil over bedrock, coarse-grained soils with less than 20 percent low plasticity Construction Guidelines fines, or soils with flocculated clays or highly plastic clays with blocky structure. Acceptable liners: Compacted clay liner(allowable seepage rate of 1 x 10.6 cm/sec if manure sealing cannot be credited or 1 x 10-5 cm/sec if manure sealing can be credited, minimum thickness of one foot), concrete, eomembranes, or geosynthetic clay liners. California NRCS Target maximum seepage rate of 1 x 10 cm/sec for all vulnerability/risk categories, except that: Conservation Practice (1) Synthetic liner required when aquifer vulnerability and risk are high (i.e., groundwater is within five Standard 313 to 20 feet of the pond bottom or coarse soils are present and the pond is within 600 feet from a domestic supply well), or (2) Other storage alternatives required when the aquifer vulnerability and risk are very high (i.e., groundwater is within five feet of the pond bottom or the pond is less than 600 feet from an improperly abandoned well and the pond is less than 1,500 feet from a public supply well or less than 100 feet from a domestic supply well).