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3 . 6 . 3 . Covers on redwood septic tanks that are dry rotted <br /> shall be replaced with either a top grade redwood or <br /> concrete rover. If either a redwood or metal septic <br /> tank shows signs of deterioration to the point it is no <br /> longer water tight , the entire tank must be replaced. <br /> 3 . 6 . 4. Repairs may be approved between individual leach lines <br /> if the parcel has no other applicable area to repair <br /> leach system. <br /> 3 . 7 . Traffic slabs over concrete septic tanks shall be <br /> designed by a Registered Engineer. <br /> 4 . PACKAGE TREATMENT PLANTS <br /> 4 . 1 . Where package sewage treatment plants are required, complete <br /> engineered plans shall be submitted by a Registered Civil <br /> Engineer to the Director of Environmental Health and the <br /> San Joaquin County Public Works Department for_ initial <br /> approval prior to beginning construction. Final approval <br /> for operation of the package sewage treatment plants shall <br /> not be granted until a waste discharge resolution has been <br /> set by the Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) . The plans shall include the following: <br /> 4. 1 . 1 . A complete scaled plot plan of the area showing wells, <br /> structures , sanitary sewerage lines , water lines and <br /> total proposed land use. <br /> 4 . 1 . 2 . Total capacity of the plant in gallons and organic <br /> load . Design criteria shall include a reserve capacity <br /> to accommodate a surge flow or increase in the average <br /> daily flow. <br /> 4. 1 . 3 . Calculations showing ability of effluent to meet <br /> discharge standards as set by the Central Valley <br /> Regional Water Quality Control Board . <br /> 4. 1 . 4 . The source of data and the data calculated to <br /> determine plant capacity. Any future connections to <br /> the existing plant or any future expansion of the plant <br /> shall be shown ontheplans . <br /> 4 . 1 . 5 . The percolation rates of leach fields or seepage pits <br /> shall be calculated and figures shown on the plans. An <br /> expansion area equal in size to the original disposal <br /> field shall be so designated on the plan to be utilized <br /> in the event of failure of the original disposal field . <br /> This expansion area shall pertain to percolation ponds <br /> or evaporation ponds as well as subsurface disposal <br /> fields . <br /> 4 . 1 . 6 . A hydrologic balance for evaporation/percolation <br /> ponds . <br /> 7 <br />