unusually high values in the early part of the record and unusually high or low 

 values later on cannot be explained with any confidence. 



Particular points of interest in Figures 3 through 9 can be summarized as 

 follows: 



1. There is slight evidence at best for increasing chloride between 1918 and 

 1945. 



2. After 1945 chloride increases in all of the supplies. This essentially 

 coincides with the beginning of increased road deicing salt applications. 



3. Only one place (Figure 5) has chloride in a well approaching or beyond 

 the accepted standard of 250 mg/£. Nevertheless overall increases range from 

 about two-fold (Figure 6) to about eighty-fold (Figure 3). 



4. Some of the supplies such as Laconia (Figure 7) appear to be starting to 

 level off by 1970. This would suggest that input and output has essentially 

 reached steady state at a new and higher chloride level. 



5. None of the supplies appear to show any decline. However, such declines 

 may occur as road deicing salt applications have been decreased since 1972. 



6. The 1920 and earlier average chloride concentration for Lake Winni- 

 pesaukee is 1.2 mg/£ and the 1970 figure is 9 mg/^. The difference between 

 these may not seem impressive but it does represent an addition of some 

 28,000 tons of chloride to storage. 



14 



