- 44 - 



Interestingly, the water level In well 4 was not altered by the 

 dilution in water chemistry. The casing for this well had been 

 broken at the ground surface and the well is located in a depression. 

 Hence, we suspect that the dilution was caused by surface water 

 entering the well. 



The 1986 water chemistry sample from well 22 was also distinctly 

 different from that of the 1985 sample (only two samples are avail- 

 able). This well is reported to be completed in the Flaxville Gravel 

 and screened from 59 to 68 feet (18.0 to 20.7 m); the specific 

 conductance decreased from 1,300 to 600 PS/ cm, sodium decreased from 

 174 to 21.7 mg/L, sulphate decreased from 307 to 25.2 mg/L, boron 

 decreased from 1,280 to 91 Ug/L, and nitrate increased from 0.16 

 to 4.65 mg/L. The water level rose about 4 feet (1.2 m). 



A casing separation was noted at the "bell" joint slightly below 

 land surface elevation. These casing problems will be corrected and 

 a bentonite slurry will be puddled into the annular space around 

 both casings this year to prevent a future recurrence of this problem. 



