- 55- 



Location 9a (West of the Polishing Pond) 



Piezometers C728A, C728B, C728C, and C728D are in the till. Piezometers 

 C728A and C728D, in the oxidized till, have been monitored for water 

 quality since April, 1986. TDS levels have been steady for C728A and 

 indicate an increasing trend for C728D as shown in Figure 38. The 

 results are elevated compared to the till piezometers at location 8a. 

 Chloride (CI) results have decreased for C728A, and C728D indicates an 

 increasing trend as shown in Figure 39. Boron (B) results have been 

 steady for both of these piezometers as shown in Figure 40. Water levels 

 for these piezometers seem to be stabilized after a significant increase 

 for a number of years as shown in Figure 41. 



Piezometer C728C is in the mottled till and C728B is in the unoxidized 

 till. C728C indicates a slight increase for TDS in Figure 38. C728B 

 shows a steady trend for TDS in Figure 38. CI results have been steady 

 for C728B and slight increasing trend for C728C as shown in Figure 39. B 

 results are steady for both piezometers as shown in Figure 40. Uranium 

 concentrations increased in C728C in 1984. However, results since 1984 

 are typical of piezometers completed in the mottled till. Water levels 

 are increased for C728C and have been steady for C728B as shown in Figure 

 41. 



Piezometer C728E is in the Empress Gravels. TDS have been variable with 

 no trends as shown in Figure 36. The results are similar to TDS for 

 C726E in the Empress Gravels at location 8a. Other water quality param- 

 eters for C728E have shown no consistent changes. Water levels for 

 C728E have been decreasing as shown in Figure 37. 



