71 Pa.C.S. § 2406

If, from pressure of work, an extra position in the classified service must be established for a period of 12 months or less, the appointing authority shall request the Office of Administration to certify the name of a qualified individual from an appropriate eligible list or by other means authorized by this part. In the request, the appointing authority shall state the cause of the extra work, the probable length of employment and the duties that the appointee is to perform.