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EVAPORATION POND CONTAINMENT SYSTEM <br /> BACKUP CALCULATIONS <br /> The following is a description of the spreadsheets used for the leachate generation and water <br /> balance calculations. In general, there are 2 tables which relate runoff generation quantities with <br /> the proposed pond geometry, monthly precipitation and evaporation amounts, and pumping rates <br /> (Tables E-3 and E-4) to obtain a pond depth at the end of each month. The following <br /> description is provided for each column of the spreadsheets. <br /> TABLE E-3 Evaporation Pond Containment System <br /> (1) Monthly average precipitation used for the model simulation. Values obtained <br /> from the Tracy-Carbona weather station. <br /> (2) Leachate pumped from the evaporation pond for use in moisture conditioning <br /> incoming compost. This is equivalent to 12 inches minus 50% of monthly <br /> precipitation (assumes half is absorbed, and half runs off) plus 10% of monthly <br /> evaporation from area of windrows (assumes re-wetting). <br /> (3) Precipitation which falls directly on the pond surface in cubic feet based on the <br /> constant area of the pond perimeter. <br /> (4) Surface area of the pond based on column (9), the pond volume at the end of the <br /> preceding month plus one-half of the precipitation (column 3) minus the volume <br /> pumped (column 2) plus leachate generated (column 8). This allows for the use <br /> of the surface area during the middle of the month (an average) to calculate the <br /> evaporative surface. <br /> (5) Monthly average pan evaporation derived from evaporation records for the Tracy <br /> Pumping Plant. <br /> (6) Reduction in evaporation due to empirical relationships relating pan evaporation <br /> to evaporation from reservoirs. <br /> LAPROJEM3970RAIN.r" E-4 December 1993 <br />