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To: Mr. Mike Quartaroli Page 4 January 13, 1988 REQUIRED SURFACE AREAS FOR THE DISPOSAL BASINS Percolation Rate Basin Area Land Area (ft/d) (acres) (acres) 0.010 2. 1 3.0 0.005 3. 1 4.2 0.000 6.1 7.6 The disposal basins should be constructed with at least two or three separate basins. This would allow one basin to be taken out of service for maintenance. A very important maintenance task will be to periodically disc the pond bottoms so that a permeable condition is maintained. Removal of accumulated solids should be needed less frequently. ` D. ADDITIONAL CONSIDERATIONS The previous discussion primarily addresses the land area and mechanical faci- lities required for a package plant and basin system, but it does not address the larger picture of whether or not this package treatment plant and disposal alternative is feasible. The feasibility will depend on overall cost of the project, groundwater and soil conditions, and regulatory agency requirements. Investigation of groundwater and soil conditions is recommended early in the planning process. Important information to obtain will be the type and per- meability of underlying soils. The depth to groundwater will be an important factor because minimum separation distances (approximately 5 ft) must be main- tained between the basin bottom and impermeable soil strata or groundwater. Short circuiting of percolated wastewater to the San Joaquin River could also be a concern. The Regional Water Quality Control Board will be interested in potential impacts to the water resources in the area. With a package treatment plant and basin system, a waste discharge permit would have to be issued by the Regional Board. These requirements could include effluent and groundwater monitoring programs. Bacteria and nitrates may be particular concerns. NOLTE and ASSOCIATES Engineers%Planners/Sury vors