Why aren't the email addresses and phone numbers of volunteers on this website?  That will make it easier to contact them.

Because of privacy reasons. 

This website is open to all visitors and search engine spiders and robots that gather email addresses for the sending Unsolicited Commercial Email (also known as spam).  We certainly don't want our volunteers' email addresses to be spammed!  In addition, volunteers serve taxpayers at the site, and do not appreciate being called at work or at home.  Email and phone numbers are available to site coordinators on a password protected site, and volunteers may choose to give their phone numbers to other volunteers.