ASH LAGOON QUALITY AND QUANTITY 



The ash lagoon system at the Poplar River Power Plant continues to be 

 operated on a closed system basis, with no discharges to surface 

 waters. During 1984 sluiced ash was directed into both ash lagoons 

 No. 1 and No. 2. In early fall, modifications to the control struc- 

 ture permitted series operation of ash lagoon No. 1, ash lagoon No. 

 2, and the polishing pond. Water from the polishing pond is returned 

 to the plant for ash sluicing. Water depths in the operational ash 

 lagoons No. 1 and No. 2 were in the 4.8-5.7 m and 2.3-3.1 m ranges, 

 respectively. 



Seepage was again calculated in 1984 using the methods developed by 

 T. A. Prickett, P. E. of Urbana, Illinois. Results of the calcula- 

 tions for the ash lagoons No. 1 and No. 2 and the polishing pond are 

 given in table 6. 



Table 6. Calculated Seepage Rates from Ash Lagoons No. 1 and No. 2 



Source Rate (L/s) 



Polishing Pond 0.183 



Ash Lagoon No. 1 0.143 



Ash Lagoon No. 2 0.230 



TOTAL SEEPAGE 0.556 



Although the calculated seepage appears to reflect the loading 

 effects from ash lagoon No. 2, the total is well below the seepage 

 limits (5.0 L/s to Cookson Reservoir and 2.0 L/s to the East Poplar 

 River) proposed in 1979 by the International Poplar River Water Qual- 



