the screen shoot showing the API key registration shows the key is registered for:
*.heavy-construction.us
so accessing the page with out www will not work, you need to use the www address:
http://www.heavy-construction.us/location.html
On the page, i see a div for the wagmp_map_3
<div id="wagmp_map_3" style="width: 300px; height: 300px;"></div>
but the coresponding wagmp_map_3.js file is not uploaded to the server
http://www.heavy-construction.us/webassist/google_javascript/wagmp_map_3.js