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to-Jot or unit sales within the .project served by the system , or upon completion of <br /> construction of the system , whichever occurs first . For those systems which are proposed to <br /> be maintained by county or municipal entities , final operation and maintenance documents <br /> must be received by the District when maintenance and operation of the system is accepted <br /> by -the local governmental entity. Failure to submit the . appropriate final documents <br /> referenced in this paragraph will. result in the permittee remaining liable for carving out <br /> maintenance and operation of the permitted system . <br /> 9 . Each phase or independent portion of the permitted system must be completed in <br /> accordance with the permitted plans and permit conditions prior to the initiation of the <br /> permitted use of site infrastructure located within the area served by the portion or phase of <br /> the. system . Each phase or independent portion of the system must be completed in <br /> accordance with the permitted plans and permit conditions prior to .transfer of responsibility <br /> for operation and maintenance of that phase or portion of the system to local government or <br /> other responsible entity . <br /> 10 . Within 30 days after completion of construction of the permitted system , or independent <br /> portion of the system , the permittee shall submit a written statement of completion and <br /> certification by a. registered professional engineer or other appropriate individual as <br /> authorized by law, utilizing As Built Certification Form 40C- 1 . 181 ( 13) or 40C- 1 . 181 ( 14) <br /> supplied with this permit . When the completed system differs substantially from the <br /> permitted plans , any substantial deviations shall be. noted and explained and two copies of <br /> as- built drawings submitted to the District, Submittal of the completed from shall serve to <br /> notify the District that the system is ready for inspection . The statement . of completion and <br /> certification shall be based on on -site observation of construction (conducted by the <br /> .. registered professional engineer, or other appropriate individual as authorized - by law , or <br /> under his or her direct supervision ) or review of as -built drawings for the purpose of <br /> determining if the work was completed in compliance .with approved plans and <br /> specifications . As drawings shall be the permitted drawings revised to reflect any <br /> changes made during construction . Both the original and any revised specifications must be <br /> clearly shown . The plans must be clearly labeled as " as-built" or "record " drawing . All <br /> surveyed dimensions and elevations shall be certified by a registered surveyor. The <br /> following information , at a minimum , shall be verified on the as-built drawings : <br /> 1 . Dimensions and elevations of all discharge structures including all weirs , slots, gates , <br /> pumps , pipes , and oil and grease skimmers ; <br /> 2 . Locations , dimensions , and elevations of all filter, exfiltration , or underdrain systems <br /> including cleanouts , pipes , connections to control structures , and points of discharge to the <br /> receiving waters ; <br /> 3 . Dimensions , elevations , contours , or cross -sections of all treatment storage areas <br /> sufficient to determine state-storage relationships of the storage area and the permanent <br /> pool depth and volume below the control elevation for normally wet systems , when <br /> appropriate.; <br /> 4 . Dimensions , elevations , contours , final grades , or cross-sections of the system to <br /> determine # low directions and conveyance of runoff to the treatment system , <br /> 5 . Dimensions , elevations , contours , final grades , or cross-sections of all conveyance <br /> systems utilized to convey off-site runoff around the system ; <br /> 6 . Existing water elevation ( s ) and the date determined ; -and Elevation and location of <br /> benchmark( s ) for the survey . <br />