Specifications include, but are not limited to: It is the intent of the City of Concord to enter into an agreement with one contractor to provide ammonia-based ice refrigeration system preventative maintenance, scheduled service, installation, repair, on an on-call and as-needed basis for its Everett Arena. Authorized City employees may request these services for their department/division upon proper notification and by providing the vendor with a current and valid Purchase Order/Purchase Order #. A separate purchase order will be issued by the City for each service requested. The pricing for any items/equipment/services not detailed by this RFP and later requested by the City shall be negotiated with the successful contractor.