Read loop from two files using descriptors

What I would like to do is read each line in the atdinfile:

A sample atdinfile would look like this:
651
652
653
654
655
656
657
658
659
660
661
664
665
666
667
668

I would like to grep through each atd job id looking for a match based on the input from another infile would is a listed of user groups:

A sample grplist file would look like this;
groupa
groupb
groupc
groupd
groupe

The code below will go through the list of atd jobs only once and try to match a corresponding line in the group file. This is not what I want. I want to grep for every group in each atd line before it moves onto the next atd job. Another problem is that the atd job list could be any number of lines whereas the grplist will tend to be static.
#!/bin/bash
set -x
ATDINFILE=/root/atdoutter.txt
DELTIMER=/root/delist.txt
USERNAME=ttimer
/usr/bin/atq | awk '{print $1}'|sort > $ATDINFILE
GRPLIST=/root/grouplist.txt
exec 3<$ATDINFILE
exec 4<$GRPLIST


while read atd <&3 && read grp <&4
do

at -c $atd|grep -wq "tmp-lock-ou.ldif."$USERNAME"" && at -c $atd | grep -wq "$grp"
 if [ $? -eq 0 ] ; then
   echo -e "${bldgrn}A $grp lock timer has been found for $USERNAME ${txtrst}" && echo "timer found for $USERNAME"
    sleep 1.5
    echo " "
     echo $atd | tee -a $DELTIMER >/dev/null 2>&1
      sleep 2
 fi
done < $ATDINFILE
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