The District agrees that there will be no subcontracting for custodial services, but reserves the right to subcontract for other services when deemed to be in the best interests of the District. The District shall notify the Association no less than forty (40) days prior to Board action regarding the subcontracting of any services traditionally or historically provided by members of the unit. Thereafter, the District shall meet and negotiate with the Association upon request to consider Association input on the impact on unit members of subcontracting for services.