ECHA/2020/666  Annex 1 to Tender Specifications  Technical Specifications Restricted  76 (77) ▪ On weekends and ECHA holidays: 100 % of the corresponding person-day  price for normal working hours, pro rata. ▪ Surcharges do not apply during travels. 2. For  “ on-call ” (also known as “ stand-by-duty ”) services to ensure the availability  of a resource - i.e. to be reachable by phone  –  during a period and, if not agreed  otherwise, to be present at the working place within 75 minutes of being alerted. 3. For  all other cases when ECHA requires working outside normal working  days/hours, a 50% or 100% surcharge of the corresponding person-day price, pro- rata, applies  on normal working days or on weekends and ECHA’s holidays  respectively.  Such “on - call” -services are chargeable by 25% (during normal working days) or  50% (during weekends and ECHA holidays) of the rate applicable for the time- window during which these services are delivered, pro-rata. The service should be  delivered by the same profile(s) providing the duties during normal working hours. For  off-site specific contracts, ECHA may demand (for justified reasons) that some  resources of the contractor, including sub-contractors, be working according to such daily  schedule that the time difference between the work hours at the place of performance and  the ECHA normal working hours does not exceed two hours. The working language of the Agency is English. The English language shall be used  throughout the execution of this Framework Contract for all communication, reports and  other documentation. Therefore, it is required that all members of the contractor ’s staff involved in the  Framework Contract have proficient knowledge of English, spoken and written. In  particular, whenever a particular person is required to work on-site at ECHA, or otherwise  needs to be in collaboration with ECHA staff during the assignment, it is necessary that  the person possesses understanding, speaking and writing skills of English language at  level C1 as a minimum. 9 ECHA reserves the right to request the replacement of a resource if s/he does not have  the adequate knowledge of English as deemed necessary for the execution of the tasks. Some annexes to the Technical Specifications document are not publicly available; section  9.2 Confidentiality describes the process on how to receive the annexes.  9  According to Common European Framework of Reference for Languages: Learning, Teaching,  Assessment (CEFR). See self-assessment grid in  https://europass.cedefop.europa.eu/en/resources/european-language-levels-cefr P.O. Box 400, FI-00121 Helsinki, Finland | Tel. +358 9 686180 | echa.europa.eu  10. Annexes  9.9. Language requirements 