The following is the link to Water Lab & Utility Shop Service Member summer internship position posting at Isle Royale National Park through AmeriCorps.
https://secure8.entertimeonline.com/ta/conservationlegacy.careers?ShowJob=705203266
Similar positions at other national Parks can be found here if you search on “Water Lab & Utility Shop Service Member”:
You can find other summer internship opportunities beside the water lab positions through AmeriCorps at the same site.