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HomeMy WebLinkAbout03411 - Technical Information Report - Drainage r� -.�ga-- � DRAINAGE REPORT � M Date: October 29, 2008 Prepared for CHEN SHORT PLAT 762 Monroe Ave Renton, Washington Prepared by MRK ENGINEERING PLLC 14218-SE 10�'Street Bellevue, WA 98007 (206) 799-1078 �� K. � pF wA s ' I �, ��^ _ G�� -5 � � !I o '� � � ��f! � ~ �� � ae�� ` � �v�. �,� �GI STER� �' �ssl�NAL E'��1� �r.,� EXPIRES DECEMBER 02,��B'C� 3 y/� TABEL OF CONTENTS Page I Project Overview 1 Vicinity Map 2A II Conditions and Requirements Summary (N/A) 3 III Offsite Analysis (N/A) 4 IV Retention/Detention Analysis and Design 5 V Conveyance System Analysis and Design (N/A) 6 VI Special Reports and Studies (N/A) 7 VII Other Permits (N/A) 8 VIII Erosion/Sedimentation Control Design 9 IX Bond Quantities Worksheet(N/A) 11 X Maintenance and Operations Manual(N/A) 12 XI Special Requirements 13 XII Conclusion 14 I PROJECT OVERVIEW Site Location The project is located in the NW 1/4, SW 1/4, SEC. 9, T. 23 N., R. 5 E., W.M., in King County, Washington. The site is located at 762 Monroe Ave NE, Renton, WA 98056. The entire site covers an area of a roximatel 0.46 acre and zoned PP Y Single-Family Residential R8 (5,000 SF/Lot). Existin� Conditions I The existing site consists of a single-family home, a garage, a grass covered lawn, I concrete driveway, concrete walkway and a deck. The terrain is generally flat Bordering properties include a single-family home to the north, south and east; the subject property borders Monroe to the west. The topography indicates that no offsite runoff is flowing to the property from the i adjacent properties. The natural site topography directs surface flows from west to the east direction. There is no sensitive area on the property. The proposed project meet the requirements of Small Drainage Review per 2005 KSWDM Section 1.1 Table 1.1.2. A, page 1-11. Develoqed condition The project proposes to subdivide this lot into three single-family lots through a short plat process. The existing house and the garage will be demolished and three new homes will be constructed. An access drivewa from Monroe Ave will Y provide access to the proposed lots. A sidewalk will be contracted in front of the property along the east side of Monroe Ave NE. 1 '� The total existing impervious surface is 4120 square feet. The proposed driveways will be approximately 2800 square feet of impervious surface; the proposed house will be 4800 square feet. The total proposed new impervious surface is 3680 square feet. The net total added impervious surface will be 3680 square feet, which falls within the limits for Small Site Drainage Review. This project meets the small site drainage criteria. • Parcel smaller than 22,000 sq. ft. This Project site is 19,980 sq. ft 19,980 sq. ft. < 22,000 sq. ft. • Less than 10,000 sq. ft. new impervious area. The project adds a net 3,680 sq. ft. new impervious area. 3,680 sq. ft, < 10,000 sq. ft All stormwater flows will be tight lined to existing storm drain system on Monroe Ave. NE. To avoid saturation of soils near the foundation of the house, roof runoff will be tight lined via downspout to the existing storm drain. Uustream Tributarv Area The topography indicates that no offsite runoff is flowing to the property from the adjacent properties. There is no sensitive area on the property. 5oi1 Classification The U.S. Soils Conservation Service has classified the soils as Alderwood soils (AgC). The subject site is not in a wetland area, along a designated stream, within the 100-year flood plain, within an erosion hazard area, within a landslide hazard ' area, within a seismic hazard area, nor a coalmine hazard area. 2 A:762 Monroe Ave NE, Renton,WA 98056-3853 I � Need help on the go?Get Voice Activated Directions for free.Call 1-800-FREE411 (1-800-373-3411). ,I "' 200 T MAPQUEST•i St y N¢'�fh St _ � Ne i�tt�St � 0�60o fs , � _ . 3 � --_ __ �' ! 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Ne 5th Pf � � � '� ,.: , 9yey � - =- i9 _ , . ��- F P z __ _ � „� i t. : � m ` --. _ o ,,., � , r- . , � „ . � j1 ,�_�, q ,`, .� � � _.: j _ �, � _ _ _ _ � — � _' , ; _. : , _., ; z --- ; : �e n _.. ' i ; , . isor .: ,, � � _ . Park Ne 4th St ' m ��.. _.____4.__._� �.��____ _ _. ____... _�_.. __ _,.__ �2008 MapQuest inc: 96�; -_---- hAap Qata �.*20�8 tN�vTEO or"TeleF,ttas II CONDITIONS AND REQUIREMENTS SUMMARY Not Applicable 3 ' III OFF-SITE ANALYSIS Not Applicable 4 -- � IV RETENTION/DETENTION DESIGN ANALYSIS AND DESIGN Flow Control Since the project proposes less than 10000 square feet of new impervious surface and meets the Small Site Drainage Review Requirements per 2005 (KCSWDM) I page 1-12, flow control analysis and design is not required. Water ualitv The proposed project adds approximately 2800 square feet of PGIS. Per 2005 KSWDM, Section 1.2.8 page 1-58, water quality is not required. 5 V CONVEYANCE SYSTEM ANALYSIS AND DESIGN Not applicable to this project. � 6 VI SPECIAL REPORTS AND STUDIES Not applicable to this project. 7 VII OTHER PERMITS No additional permits are anticipated. 8 VIII EROSION/SEDIMENTATION CONTROL ANALYSIS AND DESIGN Requirement# 1, Clearing Limits: The vegetation around the perimeter of the proposed development can be removed after temporary erosion controls are in place. The siltation control fence shall be installed as close to the clearing limits as practicable. Requirement#2, Cover Measures: King County standards notes for temporary sedimentation and erosion control (TESC) have been included in the project. Requirement#3,Perimeter Protection: Perimeter Protection is addressed by the installation of silt fences downstream of earth disturbing activity. Requirement#4, Traffic Area Stabilization: The plans call for the installation of a construction entrance per King County standards. Requirement# 5, Sediment Retention: Not applicable. Requirement#6, Surface �Vater Control: Any runoff from disturbed areas will be passed through silt fences. No offsite runoff will drain onto disturbed areas. Catch basin insert will be installed. Requirement#7,Dust Control: Dust control, when required, will be accomplished by spraying exposed soils with water until wet, without generating runoff. � Requirement# 8, Wet Season Construction: See Requirement# 2 above. Requirement# 9, Construction Within Sensitive Areas and Buffers: No construction activities will be within sensitive areas and buffers during the development of this project. Requirement# 10, Maintenance: The applicant's contractor shall serve as the TESC supervisor. Requirement#9,Final Stabilization: After the site is completely stabilized, all TESC material will be removed and all storm facilities will be made functional. Correct operation of all permanent facilities will be verified at this time. All construction debris will promptly be removed from the site to minimize construction impacts on the site. The contractor shall implement additional Best Management Practices as required by the King County inspector. 10 IX BOND QUANTITIES WORKSHEET Not applicable to this project. 11 X OPERATION AND MAINTE'.vANCE MANUAL Not applicable to this project. 12 XI SPECIAL REQUIREMENTS Special Requirement# I This project is not «�ithin critical drainage area, or adopted master drainage plan, lake management plan or shared facility drainage plan. Special requirement # I do not apply. Special Requirement# II This project is not within floodplain or floodway delineation area. Special requirement#II does not apply. Special Requirement# III I This project is not adjacent to a class 1 or 2 and does not propose to construct flood protection facility. Special requirement #III does not apply. Special Requirement#IV The proposed project meet the requirements of Small Drainage Review per 2005 KSWDM Section 11 Table 1.1.2. A, page 1-12 Special requirement #IV does not apply Snecial Requirement# V This project does not meet the high use site criteria. Special requirement # V does not apply 13 XII. CONCLUSION Based on this proposed design, in conformance with the King County Surface Water Design Manual, the total peak discharge to downstream will not increase as a result of this project; and this project will not adversely impact the existing downstream drainage system. The analysis, designs and recommendations submitted in this report are based upon our site observations, available information about the surface and subsurface conditions of the site. 14 ' i NW 1/4, SW 1/4, SEC. 9, T. 23 N., R. 5 E., W.M. 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