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Donald Pauley March 16, 1988 Page 2 I Ordinance requirements for lands proposed to be subdivided in wetland zoning districts are a minimum lot size of 20,000 square feet, a minimum lot width at the building setback line of 125 feet, and a structure setback distance of 100 feet from a wetland. As described above, Dynamic Designers Proposal does not conform to these requirements. Calculation of the natural phosphorus stripping capacity of the existing wetland using the method referenced in the RCSCS Wetland Report indicates that the wetland has the capacity to strip 19 pounds of phosphorus per year. The watershed was calculated to produce 11 pounds of phosphorus per year using the same method. Excess phosphorus stripping capacity of 8 pounds per year, is therefore predicted by the model. The wetland phosphorus stripping capacity following development is predicted to be 16 pounds per year. This represents a reduction of excess phosphorus stripping capacity by 3 pounds per year or 38 percent of excess capacity. The Dynamic Designers development represents 29 percent of the total wetland area. Because the reduction of excess phosphorus stripping capacity is proportionately greater than the wetland area owned by Dynamic Designers, a conflict with the equal apportionment requirement of the wetland ordinance may be indicated. Stormwater runoff from the site will be increased. Peak rates will • probably double from the undeveloped state and runoff volumes will be increased by at least 30 percent. The 100-year flood level in the pond will be increased due to the combined effect of the fill and the increased runoff. The flood level will be increased by approximately 0.15 feet assuming no significant changes will be made to the culvert at the pond outlet. If you have any questions, please call. Sincerely, ae;r2r-^"+-- John Borovsky JPB/jmr MV1/4:300,0 i