I have flowers in my garden that are dying . When I have inspected the soil I can detect the odour of a petroleum solvent. Is there somewhere that I can get an analysis done to confirm the presence of a solvent.
Sorry to hear that you are having a problem with your soil. You have two options:
OMAFRA ( Ministry of Agriculture, Food and Rural Affairs ) has a list of accredited soil testing Laboratories in Ontario which can be found here
The University of Guelph Laboratory Services will also preform soil analysis. This link gives step by step instructions on how to submit samples.