I purged all of the working copy checkouts of site files for all sites that are not c1 from the rtcds cds_user_apps working directory (/opt/rtcds/caltech/c1/userapps/trunk).
I first checked that there were no outstanding changes, and then did the following (in bash):
cd /opt/rtcds/caltech/c1/userapps
rm -rf trunk
svn update --depth=files trunk
svn update --depth=empty trunk/{CDS,ISI,ISC,PSL,SUS}
svn update trunk/{CDS,ISI,ISC,PSL,SUS}/{c1,common}
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