B737-800
Training / Qualification
Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; General Work Refused; General Maintenance Action
Human Factors; Staffing
While loading [the] flight; I instructed my crew to load all mail carts in the A1 compartment of the aircraft. While they were loading I noticed a box with an 'Limited/Excepted quantities' label in [the] cart. As it came up the belt I also noticed a sticker with 'ground transport only' with an aircraft and a red circle and hash mark through it indicating do not load on any aircraft. The shipment appeared to contain lithium batteries 'UN3481.' I was told by manager to make sure I load all mail.  I placed it to the side and did not load.Lack of training and oversight from the contract company [is an issue]. Pressure from company management to maximize profits; complacency; lack of caring from contract company.I removed [the shipment] from [the] belt and did not load. [It was] sent back to contract mail company so [they] could transport safely.More training; more vigilance.
Air Carrier Ground Service Lead Technician reported Contractor company attempted to load Hazmat cargo clearly labeled as Hazmat 'Surface Transport only' on aircraft.