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i <br /> SECTION I: PROJECT DESCRIPTION <br /> 1f�2S' <br /> The proposed project Sonrise Christian is located at X Airport Road, Everett , <br /> WA 98204. More generally; the site is located in Section 23, Township 28 North, and <br /> Range 4 East of the Willamette Meridian in the City of Everett, Washington. Please refer to <br /> the Vicinity Map attached later in the section. <br /> The site contains 1.88 Acres. The site is currently vacant with access from Sonrise <br /> Christian Center. The remainder of the site exists as lawn and native vegetation. The site <br /> contains one drainage basin that that slopes moderately to the south west. Please refer to <br /> the downstream analysis map for more details. Per NRCS survey of Snohomish County, the <br /> project site contains Alderwood soils that have a hydrologic classification of Type "C". <br /> Please refer to the soils map and descriptions attached later in this report for more details. <br /> I <br /> The proposal is to construct a parking lot facility. The access to the site will from <br /> the Sonrise Christian Center. Flow control requirements will be met by an underground R <br /> tank(36.75-ft by 145.75-ft by 3.54-ft)which will be located within the parking lot. The R <br /> tank will provide a total storage capacity of 18,006 CF. Water quality for the site will be <br /> provided by a bioretention upstream of detention. The outlet from the R tank will be <br /> connected to the wetland on the western portion of the site. <br /> Per Minimum Requirement#5 (Section 2.5.5 of the SWMMWW), the following <br /> BMP's shall be applied to the other hard surfaces: Full dispersion, Infiltration, Permeable <br /> Pavement, Bioretention, and then Dispersion. Full Dispersion is infeasible because the <br /> ' required native vegetation preservation could not be achieved. For infiltration, as per the <br /> Geotech report, the groundwater was encountered at a depth of 2'-3' and that the required <br /> vertical separation for such facilities could not be achieved. Permeable pavement and <br /> bioretention are not feasible because required vertical separation for such facilities could <br /> not be achieved. Basic Dispersion is not feasible because the required vegetated flow path <br /> Insight Engineering Co. -Stormwater Site Plan 12/20/2018 <br /> -3 - <br /> 1 <br />