I have noticed that the Chemistry Lookup file posted on the ESdat website has some inconsistencies with regard to the chem codes for British Columbia gros parameters.

 For example.

light extractable petroleum hydrocarbons:  only LEPH  (generic)

heavy extractable petroleum hydrocarbons:  HEPH, HEPHs and HEPHw (a mixture of generic and matrix-specific)

volatile petroleum hydrocarbons:  VPHs, VPHV and VPHw (matrix-specific only).

This creates problems for importing lab data from the lab and requires chem-code assignments each time (tedious and error-prone). 

I strongly suggest making them consistently generic or matrix-specific.  I recommend the latter, as this is how the BC regulations spell the names (unfortunately).    

Ilya