Stormwater line will be ABOVE ground corrugated pipe (No need to bury) running down to basin on NW 99 th St. It is simple and approved.

Transcription

1 Stormwater Drainage: Stormwater line will be ABOVE ground corrugated pipe (No need to bury) running down to basin on NW 99 th St. It is simple and approved. Please see pages 11 and 12 of the document below for the approved Stormwater Drainage Plan.

2 Accessor Parcel Number: Scale: 1 = 10 Figure 1. Plan Overview with Schedules for Windows and Doors

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5 City of Seattle Department of Construction and Inspections Issued for Permit Issued By: Rudy Camacho 07/19/2017 NORTH NW 99th Street, Seattle, WA Parcel # SDCI Project #: , FIGURE 3-1. FIRST LEVEL FLOOR PLAN Scale: 1 = 3

6 NORTH NW 99 th Street, Seattle, WA Parcel # SDCI Project #: , Scale: 1 = 3 FIGURE 3-2. SECOND LEVEL FLOOR PLAN

7 25 NORTH NW 99 th Street, Seattle, WA Parcel # SDCI Project #: , Scale: 1 = 3 FIGURE 3-3. LOWER LEVEL FLOOR PLAN

8 NORTH ELEVATION FT SOUTH VIEW OF ROOF WEST VIEW OF ROOF NORTH VIEW OF ROOF EAST VIEW OF ROOF Scale 1 = 4 Figure 4. Roof Plan PROPERTY ADDRESS: 1936 NW 99 TH STREET, SEATTLE, WA TAX PARCEL #: SDCI PROJECT #: ,

9 Overall FT Roof Top FT Second Level FT SOUTH First Level FT Average Grade Level 234 FT Lower Level FT Ground 226 FT EAST Garage Entrance WEST NORTH Grade Average Level calculation is based on SDCI Director s Rule Figure 5. Elevation 1936 NW 99 th Street, Seattle, WA Parcel # SDCI Project # , Use Formula 1: The Grade Average Level = FT

10 SITE PLAN PROPERTY ADDRESS: 1936 NW 99 TH STREET, SEATTLE, WA PROPERTY OWNER: QIAN ZHANG TAX PARCEL #: SDCI PROJECT #: , WETLAND AREA = 346 SQFT TOTAL LOT SIZE = 7112 SQFT DEVELOPMENT AREA = 1557 SQFT TOTAL STEEP SLOPE AREA = 5270 SQFT OVERALL PERCENTAGE OF INTRUSION INTO STEEP SLOPE = 29.5% < 30% RIPARIAN AREA = 280 SQFT LOT COVERAGE = 16% AVERAGE GRADE LEVEL = FT NOTES: Markers are surface mounted monuments in accordance with Director s Rule Stormwater pipe will lay on the surface and its placement will not require any ground disturbance and will be outside of wetland buffer area. Utility Lines: A Sewer, Trenched; B Water, Trenched; C Gas, Trenched; D Power, Overhead; E Cable/Phone, Trenched 51 PL RIPARIAN AREA SIDE YARD 5 10 Wetland Land Disturbing Area: Marker 1,2,3,8,7,6,5 (inside red lines); Access on NW 100 th St: Driveway Entrance Markers 5 and 6; Utility lines will be outside of the tree protection area. 20 FRONT YARD 12.9 NW 100 th St NON-DISTURBANCE AREA (for both wetland and Steep Slope) FRONT YARD PL Sewer, Water, Gas, Power, cable/phone Marker 1 Tree 15 3 Marker 5 Marker 7 PROPOSED HOUSE 14.2 Marker 6 Marker 2 Wetland Buffer Boundary Utility lines Entrance Marker 8 Marker Tree 5 SIDE YARD 4 PL Stormwater; see Note PL Center Line of NW 99 th Street SCALE: 1 = 13.5 Updated on 1/27/17 per ECA Wetland Correction Notice #5

11 NOTE: Markers are surface mounted monuments in accordance with Director s Rule NW 100 th Street MODIFIED WETLAND DELINEATION BOUNDARY PROPERTY ADDRESS: 1936 NW 99 TH STREET, SEATTLE, WA TAX PARCEL #: SDCI PROJECT #: , RIPARIAN AREA 20 FRONT YARD 12.9 PL Marker 1 Power Marker 5 3 PROPOSED HOUSE Tree 5 SIDE YARD Marker *Stormwater pipe will lay on the surface and its placement will not require any ground disturbance. SIDE YARD 5 MODIFIED WETLAND DELINEATION BOUNDARY 50 Tree Marker 2 Marker 3 Stormwater Pipe Location * LEGAL DESCRIPTION LOTS 16, 17, 18 BLOCK 3, THE BAYVIEW ADDITION TO SALMON BAY, ACCORDING TO THE PLAT THEREOF RECORDED IN VOL. 34 OF PLATS, PAG 77, RECORDS OF KING COUNTY, WASHINGTON PL Wetland 20 FRONT YARD PL PL SCALE: 1 = 13.5 Center Line of NW 99 th Street

12 1936 NW 99 th Street Drainage Plan Notes: 1. A perimeter drain/dewatering system should be installed to reduce the potential for groundwater entering into foundation and slab areas. 2. The subgrade beneath a structural floor system should be graded so that water does not pond. In addition, drain laterals that span the crawl space are recommended to prevent ponding of water within the crawlspace. 3. As a minimum, the subsurface drainage system should consist typically of 4-inch minimum diameter perforated rigid PVC pipe surrounded by at least one pipe diameter of free draining gravel. The pipe should be wrapped in a geosynthetic to prevent fine soils from clogging the system in the future. The pipe should drain by gravity to a suitable all-weather outlet or to a properly designed area underdrain system. Surface cleanouts of the perimeter drain should be installed at minimum serviceability distances around the addition. A properly constructed drain system can result in a reduction of moisture infiltration of the subsurface soils. Drains which are improperly installed can introduce settlement or heave of the subsurface soils and could result in improper surface grading only compounding the potential issues. 4. The entire design and construction team should evaluate, within their respective field of expertise, the current and potential sources of water throughout the life of the structure and provide any design/construction criteria to alleviate the potential for moisture changes. 5. In general, proper surface drainage should be maintained at this site during and after completion of construction operations. The ground surface adjacent to buildings should be sloped to promote rapid run-off of surface water. A minimum slope of six inches in the first five horizontal feet for landscaped or graveled areas is recommended. These slopes should be maintained during the service life of buildings. 6. Landscaping should be limited around building areas. Irrigation should be minimal and limited to maintain plants. Roof downspouts should discharge on splash-blocks or other impervious surfaces and directed away from the building. Ponding of water should not be allowed immediately adjacent to the building. 7. It is important to follow these recommendations to minimize settling of the foundation elements throughout the life of the facility. Construction means and methods should also be utilized which minimizes saturation of soils during construction. 8. Positive drainage away from the new structures is essential to the successful performance of foundations and flatwork, and should be provided during the life of the structure. Paved areas within 10 feet of structures should slope at a minimum of 2 percent away from foundations, and landscape areas within 10 feet of structures should slope away at a minimum of 8 percent. Downspouts from all roof drains, if any, should cross all backfilled areas such that they discharge all water away from the backfill zones and structures. Drainage should be created such that water is diverted away from building sites and away from backfill areas of adjacent buildings.

13 Figure 6. Storm Water Drainage System - continued Notes: 1. Existing corrugated pipe that captures and direct runoff from the neighborhood above is shown on the left. 2. The proposed storm water drainage system will not use this pipe. 3. The proposed drainage system will use a larger pipe and direct runoff to the existing drainage collection point at NW 99 th Street. 4. The overall drainage capacity from the subject lot will not increase after the development. Therefore the proposed development will not adversely impact the drainage capacity of the existing corrugated pipe that captures and directs runoff from the neighborhood above NW 99 th Street, WA Parcel # DPD Project # ,

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15 Site Plan Calculation: 1. Wetland According to the wetland report generated b the Wetland Professional Scientist (WPS), the wetland area inside the subject lot is approximately 346 SQFT. Figure 3. Non-disturbance Area

16 2. The percentage of the wetland area among the total lot area: 346 ft 2 / 7050 ft 2 = 5% According to the wetland report by the Wetland Professional Scientist: 3. Stream: According to the wetland report, Riparian Management Area is located in the northwest corner of the property. The proposed construction is outside this area. The area of Riparian Management Area is 280 SQ FT. 4. Steep Slope: According to the ECA Topographic Survey performed by Chadwick & Winters, the area of on-site step slopes 40% or greater = 5,270 SQFT or 74% of the total parcel area. (Note 8 from ECA Topographic Survey) 5. LOT COVERAGE The area of footprint of all structures on the entire lot = 1114 ft 2 ; Lot size = 7112 ft 2 according to Topographic Survey Lot coverage = 1114 / 7112 = 16 % According to Seattle Land Use Code ( ), homes (principle structures) and associated structure may cover 35% of the lot on lots 5,000 square feet in area. Lot coverage requirement is met. 6. AVERAGE GRADE LEVEL = FT. 7. Yards: The lot has the following features: (1) The yard borders both NW 99 th Street and NW 100 th Street; (2) The yard is a through lot ( a lot with two street frontage opposite of each other); (3) The yard is on a sloping lot that is greater than 35 percent.

17 The area of structural roots traveling north of the trunk No Construction An ISA certified arborist to be present to inspect FENCE REQUIREMENT