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(8) Stabilization of disturbed areas must, at a minimum, be initiated immediately whenever any clearing, grading, excavating, or other earth disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be completed within a period of time determined by the city. In arid, semiarid, and drought -stricken areas where initiating vegetative stabilization measures immediately is infeasible, alternative stabilization measures must be employed as specified by the city; (9) Utilize outlet structures that withdraw water from the surface, unless infeasible, when discharging from basins and impoundments. (f) The SWPPP shall be amended whenever there is a change in design, construction, operation, or maintenance that has a significant effect on the discharge of pollutants to state waters and that has not been previously addressed in the SWPPP. The SWPPP must be maintained at a central location onsite. If an onsite location is unavailable, notice of the SWPPP's location must be posted near the main entrance of the construction site. Sec. 11.1-9 Stormwater management plan; contents of plan. (a) A stormwater management plan shall be developed and submitted to the city. The stormwater management plan shall be implemented as approved or modified by the city and shall be developed in accordance with the following: (1) A stormwater management plan for a land -disturbing activity shall apply the stormwater management technical criteria set forth in this article and Article 4 (9VAC25-875-670 et seq.) of Part V of the Regulation to the entire land -disturbing activity. Individual lots in new residential, commercial, or industrial developments, including those developed under subsequent owners, shall not be considered separate land -disturbing activities. (2) A stormwater management plan shall consider all sources of surface runoff and all sources of subsurface and groundwater flows converted to surface runoff. (b) A complete stormwater management plan shall include the following elements: (1) Information on the type of and location of stormwater discharges, information on the features to which stormwater is being discharged including surface waters or karst features if present, and predevelopment and post -development drainage areas; (2) Contact information including the name, address, telephone number, and email address of the owner and the tax reference number and parcel number of the property or properties affected; (3) A narrative that includes a description of current site conditions and final site conditions or, if allowed by the city, the information provided and documented during the review process that addresses the current and final site conditions; (4) A general description of the proposed stormwater management facilities and the mechanism through which the facilities will be operated and maintained after construction is complete; (5) Information on the proposed stormwater management facilities, including (i) detailed narrative on the conversion to a long-term stormwater management facility if the facility was used as a temporary ESC measure; (ii) the type of facilities; (iii) location, including geographic coordinates; (iv) acres treated; and (v) the surface waters or karst features into which the facility will discharge; (6) Hydrologic and hydraulic computations, including runoff characteristics; (7) Documentation and calculations verifying compliance with the water quality and quantity requirements of these regulations; (8) A map of the site that depicts the topography of the site and includes: (i) All contributing drainage areas; Page 15 of 27