Sharp Drop in SERP Ranking for Specific Keyword

[CleanEdisonInc]

I'm sure this happens to a lot of people for a lot of different reasons.

My pages http://www.cleanedison.com/leed and http://www.cleanedison.com/courses/leed-green-associate suddenly dropped off the map over the past 2 weeks for the keyword "LEED Certification"

I tried to limit the number of times "LEED" was mentioned on the first URL (/leed) to try to combat an over-optimization penalty but I did not for the second (/leed-green-associate).

Both of them have fallen precipitously and are no where to be found on Google.

What can I do to troubleshoot this?

Is there anyway to guard against this in the future?

[fabioricotta-84038]

Why not use "leed certification" as you anchor text in your menu instead of "leed". This will give you a small boost.

As you can see here http://www.opensiteexplorer.org/links?site=www.cleanedison.com%2Fleed you don't have any links (internal or external) pointing to this page with the exact or partial anchor text "leed certification".

My guess is that you are not providing a good information to Google.

One side note: did you know you have a plenty of spammy backlinks poiting to your home page with the anchor "leed certification"? Check this http://www.opensiteexplorer.org/links?page=1&target=page&sort=page_authority&group=0&site=www.cleanedison.com&return_page=1&return_target=page&target=page&return_source=phrase&anchor_type=phrase&anchor_text=leed%20certification&anchor_id=14855739949