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F.' n ' CALIiFORNLA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION Fact`Sheet No. 7 For Dairies l Construction of Animal Waste Holding Ponds t Introduction ., The State of California has laws and regulations that apply to the design and construction of holding ponds t used for storage of anima! wastes. The Professional Engineers Act (Business and Professions Code Sections 6700-6799) and the California Code of Regulations (CCR)'Title 16, Sections 400-474.5 identify activities l that are considered civil engineering including "studies or activities in connection with fixed works for t irrigation (and) drainage ." The Board of Registration for Professional Engineers and Land Surveyors considers the design of holding ponds for animal wastes to be civil engineering. In addition, the General Construction Criteria for Class II Waste Management units in CCR Title 27. Division 2, Section 20310(e) states that "Containment structures shall be designed by, and construction shall j be supervised and certified by, a registered civil engineer or certified engineeringcolo i t from the State Board of Registration for Geologists and Geophysicists has stated hat a CEG an)desigtaff holding ponds for animal waste. # It is unlawful for anyone to practice or offer to practice civil engineering unless current.ly registered by the Board of Registration. However, an unregistered or unlicensed person is allowed to perform civil etigineenng services if the person is: • a federal officer or employee, or f-i o under the responsible charge and direct supervisign of a registered professional engineer. Additional regulations that apply wastes contained ill CCR Title 27, Subdivision 1,t Chapter 7, Subehapterequireirients for dr12, Articleng pond's 1, Se�ion 225621 These are regulations require that such ponds be protected from stream-channel overflows during 100-year peak .flows. They also require ponds to be lined with, or underlain by, soils which contain at least 10 percent clay and not ' more than 10 percent gravel or be lined with artificial materials of equivalent impertneability: Information on evaluating the clay content of holding ponds is presented in the Central Valley Regional Water Quality I Control Board's ("Regional Board's") Fact Sheet No_ 6 For Dairies "Evaluating Proposed Waste Holding Pond Sites." When lining is necessary, the Regional Board requires that a registered civil engineer design the liner and certify that it complies with the state regulations. Design of Animal Waste I-loldi❑ Ponds The design of animal waste holding ponds is largely dependent on site-specific conditions including the depth to groundwater and the soil type. As discussed in Regional Board Fact Sheet No. 5 "Soil And Groundwater Assessments For Dairies," an initial assessment of site conditions may be performed before the pond design is ' finalized and construction is started. If the pond will include a liner, the liner type may influence the shape and depth of the pond excavation. If a lined pond will be mechanically cleaned, the pond design should consider the need to protect the liner. The pond design should also meet local requirements such as' mosquito ,- abatement district requirements for access and planning department requirements for setbacks from wells, housing, and property lines. There may also be applicable regulations that specify the minirnut�i separation I between the base of the pond and highest anticipated groundwater. i f