Here you can find step by step instructions on how to determine the Longitude and Latitude of your cleanup site.

Go to Google maps at www.maps.google.com.

Type in the name of your site in the search bar and click search. (If you know how to locate your site and zoom in, then there is no need to search)

Put your mouse cursor right over the meeting point of the start of your cleanup and right click once and release. A menu will appear.

Move your mouse over the Menu option "What's here?" and left click once and release.

Look up in the search bar and you will have the longitude and latitude coordinates for your site. (first number is longitude and second is latitude. Most likely the latitude number will be a negative number.)