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Figure 9.

 
Figure 9. Relationships between site-specific median NO3-N concentration, well depth and aquifer confinement.

Diagram is a scatterplot of approximately 900 sites and shows that there is a large variation in the relationship between well depth, aquifer confinement and NO3-N concentrations. However, there is an apparent general tendency of shallow (unconfined) wells to have higher NO3-N concentrations than deeper, confined wells.