Hi Alan,
1. There is no place in the model for Zip Code boundaries. Should I add them into an existing feature class, which one, and modify a domain or just create a new feature class?
I would recommend creating a new feature class. The Local Government Information Model (LGIM) supplies a number of feature classes, but there may be some that you need that are not supplied (and vice-versa).
2. There are locations we refer to as Recycle Centers; basically it�??s the location for the neighborhood to come dispose of household garbage and recyclables. I want to put them in the FacilitySitePoint feature class. They are not a landfill so I cannot use that option. I could add recycle center to the domain but it�??s part of the subtype Industry (that�??s where landfill is). I do not believe that would be a proper use of the Industry subtype though. Any thoughts?
I would recommend creating a new Domain and Subtype value if this would make it easier for you and other users to interpret. The LGIM is not only great to help organize/manage your data, but it also makes it very easy to stand up web applications from the Resource Center's Local Government User Community. The FacilitySitePoint feature class is used for mainly reference data, so no application will need to query specific fields/domains/subtypes values within this feature class for the application to work.