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• <br /> 2. Conditions and Requirements Summary <br />•, Conditions and requirements will be determined at the time of jurisdictional review. <br /> 3. Offsite Analysis <br /> A site reconnaissance was done by Jesse Jarrell, P.E. of Western Engineers Inc. on <br />• April 19, 2011 to verify the downstream flow paths. The weather was partly sunny <br /> with a temperature around 45 degrees. <br /> The approximate 0.52 acre site is developed with one single family residence, concrete <br /> driveway, single car garage, gravel driveway and 2 car carport. The remaining portions <br />• of the site consist of residential landscaping and slopes to the southwest to north at slopes <br /> ranging from 2%to 8%. Per the SCS Soil Survey of Snohomish County,the site contains <br /> Alderwood Sandy Loam type soils. <br /> A: Upstream Analysis <br />• <br /> From aerial maps of the surrounding topography and a site visit there does not <br /> appear to be any significant upstream flows entering into the site. Minor upstream <br /> Runoff from the east side of 18th Ave West does enter the site but will be <br /> intercepted by the future frontage improvements to be installed by the development. <br />• <br /> No other significant upstream flows appear to enter into the site from the adjacent <br /> properties to the north or south. All upstream flows into the site can be ignored. <br /> B: Downstream Analysis <br />• Please refer to the Downstream Analysis Map attached in the next page for a detailed <br /> description of the downstream drainage course. <br /> From the surrounding topography, it appears that the runoff from the site flows east and <br /> into an adjacent wetland area(refer to photos 1 and 2 for reference). This wetland area is <br />• part of the neighborhood drainage system and is part of a tributary area for Swamp Creek. <br /> As flows enter into the wetland area, they turn south and travel through the adjacent <br /> neighborhood. The flow path continues south where it eventually enters into Swamp <br /> Creek and then into Lake Washington. <br />• No visible drainage problems were observed at the time of field inspection. Refer <br /> to the appendix in section 10 for the Swamp Creek Basin Map and Aerial and <br /> Downstream Basin Map. <br /> Drainage Complaints <br />• <br /> No drainage complaints are aware of for the surrounding properties or downstream path. <br /> E: /2011 / 111103A/Drainage Report.doc <br />• <br />