I only would like to keep the Access Logs of the last n days created by Tomcat Access Log Valve. http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Access%20Log%20Val
You can try to create logrotate config:
#cat /etc/logrotate.d/tomcat /var/log/tomcat/*.log { su tomcat tomcat copytruncate daily rotate 6 compress missingok }
"su tomcat tomcat" - i added for avoiding logrotate error on wrong permissions