535 VIEW RIDGE DR 2025-03-31 - Laserfiche WebLink

1-PROJECT OVERVIEW Proposed is to construct new 4335 SF SFR on a 23,112 SF (0.53 Ac) vacant parcel on Lot 62 of the Plat of Harbor View Addition. No frontage improvements currently exist along the frontage of View Ridge Drive. The property is currently a vacant lot with lawn and the original 2 driveways following the relocation of the original SFR. The property has an average grade of 3 % across the building site from south to north for the center%of the site with the south access being 15% off of View Ridge Drive and the north end of the parcel being 15%. There is no off-site storm water coming onto this parcel. Site is underlain with Alderwood gravelly sandy loam. Proposed is a new SFR with individual driveway off View Ridge Drive (public road) and roof and foundation drains to be connected to a new CB installed mid-line in the existing storm drainage system along the west side of the site that ties into storm system for Olympic Blvd. The looped driveway is to sheet flow across a 24" gravel dispersion berm then sheet flowing across the lawn having compost amended soils. Proposed is approximately 14 % lot coverage (3,232 SF) for the new house footprint with covered porches and about 33.5 % hardscape coverage total (7,742 SF). 2-MINIMUM REQUIREMENTS Minimum requirement#1: Preparation of Stormwater Site Plan A Storm water Site plan has been designed by Sound Design Engineering and is part of the submittal package. Minimum requirement#2: Construction SWPPP A SWPPP is found in section #4 of this report along with the City's small lot SWPPP added to resubmittal. Minimum requirement#3: Source Control of Pollution This project is a residential project that will not generate pollutants listed in Volume IV of the DOE 2019 SWMM. Construction site pollutants will be addressed in the SWPPP. Minimum requirement#4: Preservation of Natural Drainage Systems and Outfails The site slopes to the north and the stormwater design is to connect the roof and foundation drains to a new CB and discharge to an existing CB on the shoulder of Olympic Blvd. The proposed driveway runoff will sheet flow across a 24" gravel dispersion berm then to the vegetated lawn area in the front yard treated with compost amended soils. Minimum requirement#5: On-Site Stormwater Management 1. Roofs are 100% collected and discharged to yard drain connections on-site before being discharged to a new CB installed mid-line of an existing 8" diameter storm line along the west side of the site. Due to steepness of the north half of the site and minimal increase in stormwater runoff no other method of mitigating the small increase in stormwater is required. There is no off-site flow coming onto this site, the development site is the entire drainage basin. Per the soil investigation it was determined that the soil is classified as Alderwood-Urban Land Complex. Note that the driveway and walkway will sheet flow across a 24" gravel berm to the west and be dispersed through a vegetated strip of lawn with compost amended soils. With the site being 0.53 Ac and good Alderwood-Urban Land Complex soils, the site will continue to sheet flow the existing lawn to the north towards Olympic Blvd. Proposed landscape areas and front yard (only) will be amended per equivalent BMP T5.13 Compost Amended Soils.