3326 PAINE AVE 2018-01-01 MF Import

4. CIFFSITE ANALYSIS DEFINE STUDY AREA: From observations made during the field visit, and the topographic survey, no upstream off-site area is found to be tributary to this parcel. This is due to the existing topography of the surrounding areas as well as the developed nature of this general area. The downstream flow path is to the northwest comer of the site and inlo the alley. The existing alley runoff is collected by a catch basin approximately 120-feet north of the. site. This catch basin is connected to the combined storm/sewer syslem within 33'" St. via an 8" PVC pipe. Since this project is in the combined stomi/sewer basin the connection of the detention pipe ouffall to ttie sewer main in Paine Ave will not have any adverse impacts on the downstream system since this project is located near the upstream end of the existing main in Paine Ave and the flows from the alley and Paine Ave will combine at the intersection of 33r° St. and Paine Ave. REVIEW AVAILABLE INFORMATION: This project is not located within a FEMA floodplain and no other basin plans or drainage resource ;nfonration has been located as this time. FIELD INSPECTION: (Area of Disturbance Only) This site slopes slightiy to the north and northwest with the majority of the site runoff flowing into the existing alley northwest of the project. However, there appears to be a smalt amount of on-site runoff in the area of disturbance that leaves the site near the northeast corner of the property and enters the Paine Ave R.O.W. This runoff is collected to the north and conveyed to the combined stormisewer system. There H�ere no indications of erosion :.r�epacity problems in the portion of the downstream system that could be observed. DESCP.IPTION OF DRAINAG�= SYSTEM AND ANY EXISTING OR PREDI��TED PROBLEMS: The downstream system for this project appears in good condition. The system consists of sheet flow o��er gravel or pavement and then a piped conveyance system. Glaci�r Properties �� 5 December 2011 Page-8