Concept Plan. The owner/applicant shall submit a concept plan that provides sufficient information for an initial assessment of the proposed project and whether stormwater management can be provided according to 32-179 of this Division and the Maryland Design Manual and the Prince George's County Design Manual. Plans submitted for concept approval shall include, but are not limited to: A vicinity map; An approved Natural Resources Inventory plan; A brief narrative description of the project; Geotechnical investigations including soil maps, borings, site-specific recommendations and any additional information necessary for the proposed stormwater management design; Existing and proposed topography and proposed drainage areas, including areas necessary to determine downstream analysis for proposed stormwater management facilities; Descriptions of all watercourses, impoundments and wetlands on or adjacent to the site or into which stormwater directly flows; The location of existing and proposed structures and utilities; Any easements and rights-of-way; The delineation, if applicable, of the 100-year floodplain and all regulated environmental features as shown on the approved NRI; Any proposed improvements including location of buildings or other structures, impervious surfaces, storm drainage facilities, all grading, and other site improvements; Hydrologic computations, including drainage area maps depicting predevelopment and post-development runoff flow path segmentation and land use; Hydraulic computations; The location of the proposed limit of disturbance, erodible soils, steep slopes, and areas to be protected during construction; Preliminary estimates of stormwater management requirements, the selection and location of ESD practices to be used, and the location of all points of discharge from the site; A narrative that supports the concept design and describes how ESD will be implemented to the MEP; and Any other information required by the Department. Site Development Plan. Following concept plan approval by the Department, the owner/applicant shall submit technical plans that reflect the comments received from the previous concept plan review phase. Plans submitted shall be of sufficient detail to allow site development to be reviewed and shall include but not be limited to: All information provided during the concept plan review phase; Final site layout, exact impervious area locations and acreages, proposed grading, delineated drainage areas at all points of discharge from the site, and stormwater volume computations for ESD practices and quantity control structures; A proposed erosion and sediment control plan that contains the construction sequence, any phasing necessary to limit earth disturbances and impacts to natural resources, and an overlay plan showing the types and locations of ESD and erosion and sediment control practices to be used. A narrative that supports the site development design, describes how ESD will be used to meet the minimum control requirements, and justifies any proposed structural stormwater management measure; and Any other information required by the Department. Final Stormwater Management Plan. Following the site development plan review by the Department, the owner/applicant shall submit a final stormwater management plan for permit issuance. Plans submitted for permit issuance shall be of sufficient detail to allow all approvals and permits to be issued according to the following: Final erosion and sediment control plans shall be submitted according to COMAR 26.17.01.05; and The final stormwater management plans shall be submitted for approval in the form of construction drawings and be accompanied by a report that includes sufficient information to evaluate the effectiveness of the proposed runoff control design. Reports submitted for an approval of final stormwater management plans shall include, but are not limited to: Geotechnical investigations including soil maps, borings, site specific recommendations, and any additional information necessary for the stormwater management design plan; Drainage area maps depicting predevelopment as applicable and post development runoff flow path segmentation and land use; Hydrologic computations of the applicable ESD and unified sizing criteria according to the Maryland Design Manual and the Prince George's County Design Manual for all points of discharge from the site; Hydraulic and structural computations for all ESD practices and structural stormwater management measures to be used; A narrative that supports the stormwater management design plan; and Any other information required by the Department. Construction drawings submitted for final stormwater management plan approval shall include, but are not limited to: A vicinity map; Existing and proposed topography and proposed drainage areas, including areas necessary to determine downstream analysis for proposed stormwater management facilities; Any proposed improvements including location of buildings or other structures, impervious surfaces, storm drainage facilities, and all grading; The location of existing and proposed structures and utilities; Any easements and rights-of-way; The delineation, if applicable, of the 100-year floodplain and all regulated environmental features as shown on the approved NRI; Structural and construction details including representative cross sections for all components of the proposed drainage system or systems, and stormwater management facilities; All necessary construction specifications; Sequence of construction; Data for total site area, disturbed area, new impervious area, and total impervious area; A table showing the ESD and unified sizing criteria volumes required in the Maryland Design Manual and the Prince George's County Design Manual; A table of materials to be used for stormwater management facility planting; All soil boring logs and locations; An inspection and maintenance schedule; Certification by the owner/applicant that all stormwater management construction will be done according to this plan; An as-built certification signature block to be executed after project completion; and Any other information required by the Department. If a stormwater management design plan involves direction of some or all runoff from the site, it is the responsibility of the applicant to obtain from adjacent property owners any easements or other necessary property interests concerning flow of water. Approval of a stormwater management plan does not create or affect any right to direct runoff onto adjacent property without that property owner's permission. Notification The applicant shall send, within seven (7) days of filing of a stormwater concept plan under this Section, by first class mail an informational mailing to all adjoining property owners, including owners whose properties lie directly across a street, alley, or stream, to every municipality located within one (1) mile of the applicant's property and to all civic associations registered with the Maryland National Capital Park and Planning Commission pursuant to Sec. 17-125.01 of the County Code for the area which includes the property." The applicant shall file an affidavit of mailing with the Department prior to approval of the stormwater concept plan. The affidavit shall give the names and addresses of all persons sent informational mailings and the dates when they were sent. Before a stormwater concept plan is approved, the Department shall determine that the applicant has complied with this Section.