Section 91.6 - Availability of services(a) Services may be furnished whenever a Science and Technology staff is available and the facilities and conditions are satisfactory for the conduct of such service.(b) Laboratories may provide limited service on Saturdays and Sundays at a premium fee. Weekend service may be obtained by contacting the laboratory director or supervisor.(c) Holiday and overtime laboratory service may be obtained with a minimum 24 hour advance notice, at a premium fee, by any prospective applicant through the laboratory director or supervisor.58 FR 42415, Aug. 9, 1993, as amended at 65 FR 64310 , Oct. 26, 2000