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

Community Health Center Element# 10: Control De-Watering De-watering of the site is not expected. If dewatering of the site is needed, all groundwater removed pumped and discharged through a filtering sock and drain into interceptor trenches on site a d/or hauled to a City approved site. Ornec.236; Ve Rilro#t as t1ce Element# 11: Maintain '' MP's All Temporary Erosion and Sedimentation Control (TESC) devices and equipment will be inspected and maintained on a weekly basis if not sooner, based on storm events contributing to runoff. When construction is complete and the site is stabilized, any existing sediment will.be removed and stabilized onsite. n# ci5 : lhoetEleme0Pj A general construction manager will manage the project for or by the owners. The construction manager shall maintain all of the above items in order to minimize sediment transport and turbid water leaving the site. His job will entail continual observation of the grading operations to ensure minimal effects to adjacent properties and offsite waterways. BmP cl5o:ill okras on 1.64 ant ImP el6z:381Saliddill Element# 13: Protect On-Site Stormwater Management BMPs On-site stormwater BMPs primarily consist of permeable pavement along with soil amendments. Permeable pavement subgrade areas and soil amendment areas will be protected against com action. , . . OmP c102: Bu fir &ti and Bm P clog: gi vis 66 Fraief, 2. PROJECT DESCRIPTION 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. 3. EXISTING CONDITIONS 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 B for more detailed information. JOB NO:17-1688-A 2