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(5) <br /> <br />(6) <br /> <br />(7) <br /> <br />activity exceeding 2,500 square feet, <br />including construction of all single-family <br />houses, septic tanks, and drainfields, shall <br />also comply with the requirements of Chapter <br />11. <br /> <br />Ail on-site sewage disposal systems not requiring a <br />VPDES permit shall be pumped out at least once every <br />five years, in accordance with the provisions of <br />Section 38-312 of the Code. <br /> <br />A reserve sewage disposal site with a capacity at least <br />equal to that of the primary sewage disposal site shall <br />be provided, in accordance with Section 38-313 of the <br />Code. This requirement shall not apply to any lot or <br />parcel recorded prior to October 1, 1989 if such lot or <br />parcel is not sufficient in capacity to accommodate a <br />reserve sewage disposal site, as determined by the <br />local Health Department. Building or construction of <br />any impervious surface shall be prohibited on the area <br />of all sewage disposal sites or on an on-site sewage <br />treatment system which operates under a permit issued <br />by the State Water Control Board, until the structure <br />is served by public sewer. <br /> <br />For any development or redevelopment, stormwater runoff <br />shall be controlled by the use of best management <br />practices that achieve the following: <br /> <br />For development, the post-development nonpoint <br />source pollution runoff load shall not exceed the <br />pre-development load, based on the calculated <br />average land cover condition of the City of <br />Portsmouth; <br /> <br />For sites within IDAs or other isolated <br />redevelopment sites, the nonpoint source pollution <br />load shall be reduced by at least 10 percent. <br />This requirement may be waived for redevelopment <br />sites that originally incorporated best management <br />practices for stormwater runoff quality control, <br />provided the following provisions are satisfied: <br /> <br />In no case may the post-development nonpoint <br />source pollution runoff load exceed the pre- <br />development load; <br /> <br />Runoff pollution loads must have been <br />calculated and the BMPs selected for the <br /> <br /> <br />