You have not demonstrated the unreliability of http://www.gatineauparc.ca/home_en.html. In fact you are expressing a personal view that it is not reliable. It provides sources and documents you will find nowhere else. That is why it should be included as a reference. 

Besides, you mention the organization in the article and do not provide any reference to it. So I suggest you either delete the unsupported reference to the GPPC and NWPL, or add a refererence to http://www.gatineauparc.ca/home_en.html.

You are suppressing reliable and verifiable information in support of a Wikipedia article. This should be denounced as a violation of the letter and spirit of encylopedic knowledge.l