Q.junipers low lying
My low lying junipers the larger ones are dying Is there anything I should check for that might explain what is happening. They look yellow and brown in some places.

There are several pests and diseases that can kill juniper trees, and unfortunately, some of these are not treatable.
The following articles may help you determine what the problem is. Also look into which of the pests discussed in the articles are prevalent in your region.
http://www.clemson.edu/extension/hgic/pests/plant_pests/shrubs/hgic2056.html
http://ucanr.edu/sites/mgslo/newsletters/juniper_branch_death28050.htm
http://aces.nmsu.edu/ces/yard/2000/052000.html
http://extension.wsu.edu/snohomish/juniper-troubles/