Section 30.625 - Supervision of Operation(1) During the period beginning with commencement of construction of each hazardous waste landfill and ending two years thereafter, there shall be in effect at all times a contract properly executed by the owner or operator and by an independent Massachusetts registered professional engineer knowledgeable in matters of hazardous waste disposal. The owner or operator shall submit a copy of said contract to the Department with the license application. The contract shall provide for the following minimum requirements: (a) During site preparation, the engineer shall provide sufficient supervision, assistance and inspection to enable him to certify that preparation of the site has been done in accordance with the plans which were approved by the Department.(b) During the operation of the landfill, 1. The engineer shall provide daily supervision, engineering assistance, and plan interpretation during the first week of operation.2. The engineer shall conduct monthly inspections during the first year of operation to ensure compliance with the approved plans.3. Thereafter, the engineer shall conduct inspections of the landfill operation at least once every two months.(c) The engineer shall comply with 310 CMR 30.625(3) and (4).(2) After expiration of the period specified in 310 CMR 30.625(1), there shall be in effect at all times a contract properly executed by the owner or operator and by an independent Massachusetts registered professional engineer knowledgeable in matters of hazardous waste disposal. The owner or operator shall submit to the Department a copy of each such contract. Each such contract shall provide for the following minimum requirements:(a) The engineer shall conduct inspections at least once every two months; and(b) The engineer shall comply with 310 CMR 30.625(3) and (4).(3) After each site inspection, the engineer shall prepare a written report for the owner or operator. This report shall be part of the facility's operating record and shall be kept in compliance with 310 CMR 30.541 through 30.543. The engineer shall also submit a copy of this report to the Department within 15 days of the inspection.(4) The engineer shall promptly notify the Department of any and all deviations from the approved plans and operating procedure.