EMPLOYEE STATES SHE WAS SHOVELING CLAY OFF PIT CAR ON JUNE 19 AND FELT PAIN IN HER BACK. DID NOT REPORT INJURY UNTIL 6-22. CONTINUED WORKING FOR A WEEK, THEN WENT ON VACATION FOR 2 WEEKS. REPORTED TO CLINIC ON 7-15 WITH CONTINUING PAIN AND WAS PUT ON MODIFIED DUTY.