1 Pa. Code § 35.146
Unless notice is waived, no deposition may be taken except after at least 10 days' notice to the participants if the deposition is to be taken within this Commonwealth, and 15 days' notice when a deposition is to be taken elsewhere. The notice shall be given in writing by the participant proposing to take a deposition to the other participants and to the agency. In such notice and application to take evidence by deposition, the participant desiring to take the deposition shall state the name and post office address of the witness, the subject matter concerning which the witness is expected to testify, the time and place of taking the deposition, the name and post office address of the notarial officer before whom it is desired that the deposition be taken and the reason why the deposition should be taken. The other participants may, within the time stated in this section, make an appropriate response to the notice and application.
1 Pa. Code § 35.146
This section cited in 1 Pa. Code § 35.137 (relating to oral examination); 4 Pa. Code §89.31 (relating to investigation); 4 Pa. Code §265.3 (relating to level II hearings); 4 Pa. Code §607a.13 (relating to subpoenas); 7 Pa. Code §179.16 (relating to limited discovery); 25 Pa. Code §1021.102 (relating to discovery); 34 Pa. Code §95.94 (relating to depositions); 34 Pa. Code §131.62 (relating to oral depositions); 34 Pa. Code §131.63 (relating to time for taking oral depositions); 34 Pa. Code §131.64 (relating to notice of oral depositions); 34 Pa. Code §131.65 (relating to objections to taking of oral depositions); 34 Pa. Code §131.68 (relating to discovery of records); 34 Pa. Code §131.70 (relating to discovery of statements of parties or witnesses); 34 Pa. Code §131.204 (relating to UEGF subpoenas and interrogatories); 40 Pa. Code §15.49 (relating to deposition); 52 Pa. Code §5.343 (relating to procedures in deposition by oral examination); 52 Pa. Code §1005.162 (relating to depositions); 55 Pa. Code §41.120 (relating to limitations on scope of discovery); and 58 Pa. Code § 493a.11 (relating to discovery).