10521 19TH AVE SE 2022-05-23 - Laserfiche WebLink

Silver Lake Plaza 2. PROJECT DESCRIPTION The proposed project consists entirely of clearing/grading for the construction of a new two story mixed use commercial building with associated parking and drainage improvements. The proposed building is designed to contain a restaurant, hair salon, and office space. Access to the site to be provided directly from 19th Avenue SE to the west of the site. All new utilities to be provided by existing services within 191h Avenue SE. Drainage management for new on -site runoff will be provided by an underground detention systems along the south side of the site beneath the proposed parking and drive aisle areas. Disturbed pervious areas will be amended per BMP T5.13. Total new/replaced hardscape has been calculated at approximately 32,890 sf. The project is to be designed according to the 2014 Stormwater Management Manual for Western Washington (SWMMWW). 3. EXISTING CONDITIONS The site consists of two parcels with one tax number and contains existing unmaintained vegetation. The site tends to slope westerly toward 19th Avenue SE at slopes ranging from 3% to 12%. 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 test pits taken by Robinson Noble, Inc. soils on -site resemble silty fine sand type soils that are unsuitable for infiltration. Refer to "Geotechnical Engineering Report" by Robinson Noble, Inc. dated March 23, 2016 for more detailed soil information. 4. ADJACENT AREAS The adjacent parcel to the north is developed with existing commercial buildings and parking lots. The adjacent parcels to the south and east are developed with existing residential structures and driveways. The 19th Avenue SE right-of-way lies along the western boundary of the site. 5. SITE FEATURES AND SENSITIVE AREAS The site tends to slope westerly toward 19th Avenue SE at slopes ranging from 3% to 12%. 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 test pits taken by Robinson Noble, Inc. soils on -site resemble silty fine sand type soils that are unsuitable for infiltration. Refer to "Geotechnical Engineering Report" by Robinson Noble, Inc. dated March 23, 2016 for more detailed soil information. POTENTIAL SOURCES OF POLLUTION Potential temporary sources of pollution include possible fuel spillage during construction. All major fuel spillage during construction are to be cleaned up immediately. No long-term potential sources of pollution are expected from the development. 6. SOILS From Soil Survey of Snohomish County Area Washington as sited in the Full Drainage Report, the soils on -site consist of "Alderwood Urban Land Complex" type soils. According to test pits taken by Robinson Noble, Inc. soils on -site resemble silty fine sand type soils that are unsuitable for infiltration. Refer to "Geotechnical Engineering Report" by Robinson Noble, Inc. dated March 23, 2016 for more detailed soil information. JOB NO: 15-1415-A