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<br />iii <br /> <br />water quality protection provisions (4 VAC 93-20-20-71 et seq.) of the <br />Virginia Stormwater Management Regulations and shall achieve the <br />following: <br /> <br />a. For development, the post-development nonpoint source <br />pollution runoff load shall not exceed the pre-development load, <br />based on the following land cover conditions for the city: lots <br />platted before April 5, 1994, shall utilize 41 percent, lots platted <br />after April 5, 1994, shall utilize 19 percent for the Elizabeth River <br />Watershed, 40 percent for the Western Branch Watershed, and 54 <br />percent for the Southern Branch Watershed; <br /> <br />b. For redevelopment, the nonpoint source pollution load shall be <br />reduced by at least ten (10) per cent of the existing load. The City <br />Manager, or designee may waive or modify this requirement for <br />redevelopment sites that originally incorporated best management <br />practices for stormwater runoff quality control, provided that: <br />1. In no case may the post-development nonpointsource <br />pollution runoff load exceed the predevelopment load; and <br /> <br />2. Best management practice facilities shall be in good <br />working order and performing at the design levels of service. The <br />City Manager shall conduct a review of the original structural <br />design and the maintenance plans of such facilities. The execution <br />of a new maintenance agreement may be required to ensure <br />compliance with these requirements. <br /> <br />c. For sites within IDAs or other isolated redevelopment sites, the <br />nonpoint source pollution load shall be reduced by at least ten <br />percent; <br /> <br />d. For redevelopment, both the pre- and post-development <br />loadings shall be calculated by the procedures outlined by the <br />current Virginia Storm water Management Handbook Manual. <br />Calculations involving the percentage of site area under <br />impervious cover shall be based upon the lot area landward of <br />mean high water and wetlands. However, where the design data is <br />available, the original post-development nonpoint source pollution <br />loadings can be substituted for the existing development loadings; <br />and <br /> <br />e. Storm water management criteria for redevelopment shall apply <br />to any redevelopment, whether or not it is located within an <br />intensely developed area designated by the city. <br /> <br />(10) Prior to initiating grading or other on-site activities on any portion of <br />a lot or parcel, all required federal, state, and local permits shall be <br />