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105 RUNOFF COEFFICIENT, SOILS, AND RAINFALL INFORMATION The initial runoff curve number for the pre-construction site is "CN" = 96. The post-construction runoff curve number for the site will be "CN" = 96. The site is 56 acres of which approximately 27.71 acres will be disturbed by construction activities. See soils information located in Appendix H. The site is in Erie County, which receives an average of approximately 45 inches rainfall annually with the highest amounts of rainfall received in the months of May thru September. Annual snow for this area is approximately 120 inches. 106 WATERS Existing site drainage generally flows to two primary drainage areas. The western portion of the site drains toward Slade Avenue, while the remainder of the site is collected by an existing network of catch basins that ultimately discharge through a large storm sewer outlet located near the north central portion of the site. This outlet conveys runoff directly to Cazenovia Creek. 107 INDIAN COUNTRY LANDS This project is not located on Indian Lands. 108 ENDANGERED AND THREATENED SPECIES No endangered or threatened species have been determined to be on the site. 109 CRITICAL HABITAT See section 108 above. 110 HISTORIC PLACES The assessed property is not shown on the NYSHPO map as an archeologically sensitive area. A review by NYSHPO was conducted, a copy of their review and clearance letter is included in Appendix K of this report. 111 WETLANDS AND/OR OTHER SURFACE WATERS There are no known wetlands located on site. See Appendix L for NYSDEC Environmental Resource Mapper. 112 EROSION AND SEDIMENT CONTROLS 112.1 STABILIZATION PRACTICES Stabilization practices for this site include: A. Land clearing activities shall be done only in areas where earthwork will be performed and shall progress as earthwork is needed. B. Use of stabilization method for all slopes having a slope greater than 1V:3H. West Seneca Exchange 07/20/2026 Page 10 of 24 Page 831 of 1174