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prior to lot or unit sales within the project served by the system , or upon completion of construction of the system , whichever occurs first. For those systems which are proposed to be maintained by county or municipal entities , final operation and maintenance documents must be received by the District when maintenance and operation of the system is accepted by the local governmental entity . Failure to submit the appropriate final documents referenced in this paragraph will result in the permittee remaining liable for carrying out maintenance and operation of the permitted system . 9 . Each phase or independent portion of the permitted system must be completed in accordance with the permitted plans and permit conditions prior to the initiation of the permitted use of site infrastructure located within the area served by the portion or phase of the system . Each phase or independent portion of the system must be completed in accordance with the permitted plans and permit conditions prior to transfer of responsibility for operation and maintenance of that phase or portion of the system to local government or other responsible entity . 10 . Within 30 days after completion of construction of the permitted system , or independent portion of the system , the permittee shall submit a written statement of completion and certification by a registered professional engineer or other appropriate individual as authorized by law, utilizing As Built Certification Form 40C- 1 . 181 ( 13) or 40C- 1 . 181 ( 14) supplied with this permit. When the completed system differs substantially from the permitted plans , any substantial deviations shall be noted and explained and two copies of as - built drawings submitted to the District . Submittal of the completed form shall serve to notify the District that the system is ready for inspection . The statement of completion and certification shall be based on on -site observation of construction (conducted by the registered professional engineer , or other appropriate individual as authorized by law , or under his or her direct supervision) or review of as- built drawings for the purpose of determining if the work was completed in compliance with approved plans and specifications . As - built drawings shall be the permitted drawings revised to reflect any changes made during construction . Both the original and any revised specifications must be clearly shown . The plans must be clearly labeled as " as - built" or " record " drawing . All surveyed dimensions and elevations shall be certified by a registered surveyor. The following information , at a minimum , shall be verified on the as- built drawings : 1 . Dimensions and elevations of all discharge structures including all weirs , slots , gates , pumps , pipes , and oil and grease skimmers ; 2 . Locations , dimensions , and elevations of all filter , exfiltration , or underdrain systems including cleanouts , pipes , connections to control structures , and points of discharge to the receiving waters ; 3 . Dimensions , elevations , contours , or cross-sections of all treatment storage areas sufficient to determine state-storage relationships of the storage area and the permanent pool depth and volume below the control elevation for normally wet systems , when appropriate ; 4 . Dimensions , elevations , contours , final grades , or cross- sections of the system to determine flow directions and conveyance of runoff to the treatment system ; 5 . Dimensions , elevations , contours , final grades , or cross - sections of all conveyance systems utilized to convey off-site runoff around the system ; 6 . Existing water elevation (s) and the date determined ; and Elevation and location of benchmark (s) for the survey . 11 . The operation phase of this permit shall not become effective until the permittee has submitted the appropriate As- Built Certification Form , the District determines the system to be in compliance with the permitted plans , and the entity approved by the District in accordance with subsections 7 . 1 . 1 through 7 . 1 . 4 of the Applicant's Handbook : Management and Storage of Surface Waters , accepts responsibility for operation and