2918-25 STORMWATER final 4_1_25.doc.pdf

36 or perennial streams, wetlands, and flood plains along with their appropriate buffer strips, marshlands and other wetlands, forests, and core forests, pervious or vegetative surfaces, existing man-made structures, roads, bearing and distances of property lines, and significant natural and manmade features not otherwise shown. 3. Project Description and Site Plans A map (or maps) at the scale of the topographical base map indicating the location of existing and proposed buildings roads, parking areas, utilities, structural facilities for stormwater management and sediment control, and other permanent structures. The map(s) shall also clearly show areas where alterations will occur in the natural terrain and cover, including lawns and other landscaping, and seasonal high groundwater elevations. A written description of the site plan and justification for proposed changes in natural conditions shall also be provided. 4. Land Use Planning and Source Control Plan This plan shall provide a demonstration of how the goals and standards of § 25- 29.3 through § 25-29.5 are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible. 5. Stormwater Management Facilities Map The following information, illustrated on a map of the same scale as the topographic base map, shall be included: i. Total area to be disturbed, paved or built upon, proposed surface contours, land area to be occupied by the stormwater management facilities and the type of vegetation thereon, and details of the proposed plan to control and dispose of stormwater. ii. Details of all stormwater management facility designs, during and after construction, including discharge provisions, discharge capacity for each outlet at different levels of detention and emergency spillway provisions with maximum discharge capacity of each spillway. iii. Location and results of all test pits, overlaid with the location of all BMPS. The SHWT, depth of mottling observed, and bottom elevation of the BMP shall be listed in a comprehensive chart. iv. Map of predevelopment and post development drainage areas v. Map demonstrating the contributory drainage area for each BMP. 6. Calculations i. Comprehensive hydrologic

ed in a comprehensive chart. iv. Map of predevelopment and post development drainage areas v. Map demonstrating the contributory drainage area for each BMP. 6. Calculations i. Comprehensive hydrologic and hydraulic design calculations for the pre- development and post-development conditions for the design storms specified in § 25-29.4 of this ordinance. ii. When the proposed stormwater management control measures depend on the hydrologic properties of soils or require certain separation from the