Public Improvements Review Checklist
Plans must be sealed by a Registered Professional Engineer and shall be submitted for review and approval. All new development and redevelopment shall include a stormwater management plan. See the Independence Stormwater Management Manual. All projects that disturb over 50 cubic yards must have a Soil Management plan that meets the following: I. A topsoil layer meeting these requirements: • An organic matter content, as measured by the loss-on-ignition test, of a minimum 5 percent (target 6 percent) dry weight in planting beds, or a minimum 2.5 percent (target 3 percent) organic matter content in turf areas. • A pH from 6.0 to 8.0 or matching the pH of the original undisturbed soil. • A minimum depth of 6 inches. II. Scarify subsoils below the topsoil layer at least 4 inches for a finished minimum depth of 10 inches of uncompacted soil that is free of debris. Incorporate some of the upper material to avoid stratified layers, where feasible.
Performance Standards from the new Stormwater Management Plan are as follow: I. Post-development peak discharge rates from the site shall not exceed those indicated below: • 50% storm peak rate less than or equal to 0.5 cfs per site acre • 10% storm peak rate less than or equal to 1.0 cfs per site acre • 1% storm peak rate less than or equal to 1.8 cfs per site acre II. 40-hour extended detention of runoff from the local 90% mean annual event (1.37”/24-hour rainfall). See Chapter 6 of the MARC/APWA BMP Manual for calculating this volume.
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