1019 112TH ST SW 2019-09-25 - Laserfiche WebLink

Community Health Center Minimum Requirement # 1: Stormwater Site Plan Executive Summary The proposed project consists entirely of clearing/grading for the construction of a new parking lot addition. The addition will be adjacent to existing on-site parking and serve the existing on-site commercial building. Access to the addition will be provided through an existing drive aisle through the site that accesses 112th Street SW to the south. Drainage management for new parking areas will be provided by permeable pavement BMPs. Total new/replaced hardscape has been calculated at approximately 4,510 sf. and does not require either water quality treatment or flow control BMPs. Disturbed vegetated areas will be amended per BMP T5.13. The project is to be designed according to the 2014 Stormwater Management Manual for Western Washington(SWMMWW) and the City of Everett Design and Construction Standards and Specifications. Existing Conditions Summary The site consists of one parcel that contains an existing commercial building with associated parking areas and storm drainage conveyance systems. The site tends to slope easterly toward adjacent parcels at slopes ranging from 2%to 15%. From a Snohomish County Soil Survey done by the USDA NRCS the soils on-site consist of"Alderwood Urban Land Complex"type soils. According to soil logs taken by Timothy Sarkela of Western Engineers, soils on-site resemble silty sand. Refer to Appendix II for more detailed information. The adjacent parcel to the west is developed with existing commercial buildings and parking lots. The adjacent parcels to the east are developed with existing residential structures and driveways. The 112th Street SW right-of-way lies along the southern boundary of the site. WESTERN ENGINEERS,INC. 2 PROJECT:17-1688-A