The Contractor shall provide all personnel, labor, equipment, supplies, chemicals, transportation,tools, materials, supervision, quality control, and other items and non-personal services necessaryto ... The Contractor shall provide all personnel, labor, equipment, supplies, chemicals, transportation,tools, materials, supervision, quality control, and other items and non-personal services necessaryto perform janitorial/custodial services as defined in the PWS. The period of performance for thebase year shall be 1 December 2026 (or subsequent date) through 30 November 2027.