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Home My WebLink AboutSWP272938(4) DRAINAGE REPORT Proposed Rousso Short Plat "A" J 1500 Aberdeen Avenue N.E. Renton, Washington Prepared for: Mark Rousso 64 Rainier Avenue South, Suite T" Renton, WA 98055 March 13, 2001 Our Job No.7585 �RRY JAC0,0 coo EXPIRES 107107�� GHA(j CIVIL ENGINEERING, LAND PLANNING,SURVEYING, ENVIRONMENTAL SERVICES 18215 72ND AVENUE SOUTH, KENT,WA 98032 • (425)251-6222 (425)251-8782 FAX www.barghausen.com sG y. TABLE OF CONTENTS 1.0 INTRODUCTION/GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.0 TIR WORKSHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.0 VICINITY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.0 ANALYSIS OF THE FIVE CORE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 J 5.0 ANALYSIS OF SPECIAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.0 SCS SOILS MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 • .p6t1 1.0 INTRODUCTION/GENERAL INFORMATION 1.0 INTRODUCTION/GENERAL INFORMATION • The proposed project site, known as Rousso Short Plat "A," is located within the southeast quarter of Section 5, Township 23 North, Range 5 East, Willamette Meridian, City of Renton, King County, Washington. More particularly,the site is located at 1500 Aberdeen Avenue N.E.,Renton,Washington. The site currently exists as an existing single-family residence located on a 0.39-acre lot, with an associated pool in the backyard,concrete driveway, and several trees scattered through the backyard of the lot. The proposal for this development is to construct a 3-lot short plat by adding two new lots to the development behind the existing single-family residence located in the front portion of the lot. The majority of the lot,from the approximate location of the existing house,slopes off toward the back of the lot in an easterly direction at an approximate grade of 1 1/2 percent. The front yard of the lot slopes off toward Aberdeen Avenue N.E. at a similar grade:,the existing trees on the lot are fir trees and, for the most part, will be cut down for development of the short plat. The project site soils are classified as Indianola,which is a Type"A"soil,meaning infiltration would be applicable if it was required from this development. • • 7585.002[JPJ/bgl • j� • 2.0 TIR WORKSHEET King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET • Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner Mark Rousso Project Name Address 64 Rainier Avenue South, Suite "F," Rousso Short Plat"A" Renton, WA 98055 Location Phone Township 23 North Project Engineer Hal Grubb Range 5 East Company Barghausen Consulting Engineers, S.E. 1/4 Section 5 Inc. Address/Phone 18215-72nd Avenue South Kent,Washington 98032/(425)251-6222 Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS APPLICATION ❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management ❑ Short Subdivision ❑ COE 404 ❑ Rockery ❑ Grading ❑ DOE Dam Safety ❑ Structural Vaults • ❑ Commercial ❑ FEMA Floodplain ❑ Other ❑ Other Short Plat ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community City of Renton Drainage Basin Lake Washington Part 6 SITE CHARACTERISTICS ❑ River ❑ Floodplain ❑ Stream ❑ Wetlands ❑ Critical Stream Reach ❑ Seeps/Springs ❑ Depressions/Swales ❑ High Groundwater Table ❑ Lake ❑ Groundwater Recharge ❑ Steep Slopes ❑ Other • 7585.003 [JPJ/athj Part 7 SOILS Soil Type Slopes Erosion Potential Erosive Velocities • Indianola 4 to 15 percent D Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT D ❑Additional Sheets Attached Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Sedimentation Facilities ✓ Stabilize Exposed Surface ❑ Stabilized construction Entrance ✓ Remove and Restore Temporary ESC Facilities • ✓ Perimeter Runoff control ✓ Clean and Remove all Silt and Debris ❑ Clearing and Grading Restrictions ❑ Ensure Operation of Permanent Facilities ✓ Cover Practices ❑ Flag Limits of SAO and open space preservation ✓ Construction Sequence areas ❑ Other ❑ Other Part 10 SURFACE WATER SYSTEM ❑ Grass Lined ❑ Tank ❑ Infiltration Method of Analysis Channel ❑ Vault ❑ Depression Compensation/Mitigation ❑ Pipe System ❑ Energy Dissipater ✓ Flow Dispersal of Eliminated Site Storage ❑ Open Channel ❑ Wetland ❑ Waiver ❑ Dry Pond ❑ Stream ❑ Regional Detention ❑ Wet Pond Brief Description of System-Operation Facility Related Site Limitations • Reference Facility Limitation 7585.003 IJPJ/athi Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS ❑ Cast in Place Vault ❑ Drainage Easement • ❑ Retaining Wall ❑ Access Easement ❑ Rockery>4' High ❑ Native Growth Protection Easement ❑ Structural on Steep Slope ❑ Tract ❑ Other ❑ Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER 1 or a civil engineer under by supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments'./To the best of my knowledge the information provided here is accurate. �1,,& ?�-1 '12 c Signed/Date • • 7585.003 PPJ/ath] • 3.0 VICINITY MAP 3S ' Sf 1 t; ;2y1€ .MS` n a� •- vf: 390p � E 1 WK AY t yt�t a .Fi t t >< N1[ M L ts t �i wkr ��t r M +t2 S � �C,�A'b •k 12A � q di � G Y C t •�. .t*�P i � ti .,y H19ITr ��,p 'r �. tq`r.,d •r. H 1 Vt, J 'l,p a' t f_ a, n [ N � fir•, �$u t; Ste r i.�. iQ` / 711 ♦ h r .. • 4.0 ANALYSIS OF THE FIVE CORE REQUIREMENTS 4.0 ANALYSIS OF THE FIVE CORE REQUIREMENTS • Core Requirement No. I-Discharge at the Natural Location: The discharge from the proposed project site must occur at the natural location. Response: This project site proposes no change in the discharge location of any on-site runoff generated and released from the project site. Core Requirement No. 2- Off-Site Analysis: All proposed projects must identify the upstream tributary drainage area and perform a downstream analysis. Levels of analysis required depend upon the problems identified orpredicted. At a minimum,a Level I Analysis must submitted with the initial permit application. 1' Response: The City of Renton has indicated that a Level 1 Downstream Analysis is not required for this project. Core Requirement No. 3 - Runoff Control: Proposed projects must provide runoff control to limit the developed condition's peak rates of runoff to the pre-development peak rates for specific design storm events based on the runoff from defined existing site conditions and install biofiltration measures. 7 Response: This project proposes to construct less en 5,�omet. e feet of new impervious surface. Therefore, the requirements for peak rate runoff contro In addition, the requirement for providing stormwater quality treatment: If there is a 5,000 square feet of new impervious surface subject to vehicular use or storage of chemicals will dictate whether a project is required to provide treatment for water quality. Since this project is proposing much less than 5,000 square feet of new impervious surface subject to vehicular traffic or storage of chemicals,water quality improvements are not required for this development. Core Requirement No. 4- Conveyance System: All conveyance systems for proposed projects must be analyzed, designed, and constructed for existing tributary off-site runoff and developed on-site runoff from the proposed project. Response: As mentioned previously,the soil type is Indianola, as classified by the SCS Classification System,which is highly permeable type soil. According to the 1998 King County, Washington Surface Water Design Manual,for individual single-family residential lots that have not previously been covered under an approved drainage plan with a lot area that is under 22,000 square feet, splash blocks may be used in place of other downspout systems, provided that certain requirements are met. This project proposes splash blocks as a means of downspout conveyance. It is likely that runoff from the downspouts will infiltrate into the ground very readily. Core Requirement No. 5- Temporary Erosion and Sedimentation Control. All projects that require engineered drainage plans shall provide temporary erosion and sedimentation control measures that minimize the transport of sediment to drainage facilities, water resources, and adjacent properties. Response: A Temporary Erosion and Sedimentation Control Plan shall be provided with the final construction drawings prepared for this project, meeting all the requirements of the 1998 King County, Washington Surface Water Design Manual. • 7585.002[JPJ/bg] • 5.0 ANALYSIS OF SPECIAL REQUIREMENTS 5.0 ANALYSIS OF SPECIAL REQUIREMENTS • Many of the special requirements delineated in the 1998 King County, Washington Surface Water Design Manual are applicable to this project site, therefore,no analysis of these requirements are being made at this time. This project site does not meet the threshold of any of those requirements. • 7585,002[JPJ/bq] • f • 6.0 SCS SOILS MAP • f�S { G m 1v" - �G•tG Q �• f 'j( «A N ti �two LO • C .f W U-LU a /Z�i\:A,� ✓ .. ' I pUr E -r" { ` s 7" • 1ai' ~ �•� �1 s ^' EvC} -" S �--r .. ' •H19/l 4 — Q — , � ., r, r ,• x: ca� ht . a, .• •::. n • • ; r. ,s ek`S! -. a '.� c.. •',�` V - ,t. .Q ,` �� • 4rf w . O m .,, „, $ � ,:.; � ,. Sao ,�„o ac• �.: a , m �� r, ,• a;,y+ F IE-2 LANE '� --•� d• r 7M1`'rI ♦ .� y LANE-� 4 ,; ,,kty ,{4 • AY '11 ••• ^ N C m • •V• • I rN� ,. r A. rcd a LN `� :, ,i}�#''•r r3*`A.r. �s'- e.. f c• . caJAs.. ; ,( 9r �'.�+'Ar t��.,• wJ "�`, '�;r52' A M'r•�f'� .. - s•o�ySr'` m 49 %�• m.• ^ $ 4 y 4 1} V ,fib .�h, `n,• to .... k 4 . KpY• r4 ' f '� ` ty,,1 '�, Y t Yi t Lu IS � �. � (�rppy._ a tip.�'�� r.-•: � �a 3y � �'��_,� ��--�` S�y 4+�a'�t�... w f � O fa hf� w i s tl^i '�(t i , eyy t MS.Y r G O 00 •i r _ t r yy 1, M•• Y IFJ9 • * c , �� T.i ''%I :. Y -•._'. .. ,%rw¢.T.� "v E.�i'.ct .'!. 'Ce ~. i. 4'...z:: GUIDE TO MAPPING UNITS For a full description of a mapping unit, read both the description of the mapping unit and that of the soil series to which the mapping unit belongs. See table 6, page 70, for descriptions of woodland groups. Other • information is given in .tables as follows: Acreage and extent, table 1, page 9. Town and country planning, table 4, page 57. Engineering uses of the soils, tables 2 and 3, Recreational uses, table 5, page 64. pages 36 through 55. Estimated yields, table 7, page 79. Woodland Described Capability unit group Map on symbol Mapping unit page Symbol Page Symbol AgB Alderwood gravelly sandy loam, 0 to 6 percent slopes---------- 10 IVe-2 76 3d2 AgC Alderwood gravelly sandy loam, 6 to 15 percent slopes--------- 8 IVe-2 76 3dl AgD Alderwood gravelly sandy loam, 15 to 30 percent slopes.-------- 10 VIe-2 78 3dl AkF Alderwood and Kitsap soils, very steep-------- t'------------- 10 VIIe-1 78 2d1 AmB Arents, Alderwood material, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2 AmC Arents, Alderwood material, 6 to 15 percent slopes 1/--------- 10 IVe-2 76 3d2 An Arents, Everett material 1/---------------------------------- 11 IVs-1 77 3f3 BeC Beausite gravelly sandy loam, 6 to 15 percent slopes---------- 11 IVe-2 76 3d2 BeD Beausite gravelly sandy loam, 15 to 30 percent slopes--------- 12 VIe-2 78 3dl BeF Beausite gravelly sandy loam, 40 to 75 percent slopes--------- 12 VIIe-1 78 3dl Bh Bellingham silt loam------------------------------------------ 12 IIIw-2 76 3w2 Br Briscot silt loam--------------------------------------------- 13 IIw-2 75 3wl Bu Buckley silt loan--------------------------------------------- 13 IIIw-2 76 Owl Cb Coastal beaches----------------------------------------------- 14 VIIIw-I 78 --- Ea . Earlmont silt loam-------------------------------------------- 14 IIw-2 75 3w2 Ed Edgewick fine sandy loam-------------------------------------- 15 IIIw-1 75 2ol EvB Everett gravelly sandy loam, 0 to 5 percent slopes------------ 15 IVs-I 77 3f3 EvC Everett gravelly sandy loam, 5 to 15 percent slopes----------- 16 VIs-1 78 3f3 EvD Everett gravelly sandy loam, 15 to 30 percent slopes---------- 16 VIe-1 77 3f2 EwC 'Everett-Alderwood gravelly sandy loams, 6 to 15 percent slopes------------------------------------------------------ 16 VIs-1 78 3f3 • InA Indianola loamy fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3 _ InC Indianola loamy fine sand, 4 to 15 percent slopes---- ------ 16 IVs-2 77 4s3 InD Indianola Loamy fine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2 KpB Kitsap silt loam, 2 to 8 percent slopes----------------------- 17 IIIe-1 75 2d2 KpC Kitsap silt loam, 8 to 15 percent slopes---------------------- 18 IVe-1 76 �d2 KpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2d1 KsC Klaus gravelly loamy sand, 6 to 15 percent slopes------------- 18 VIs-1 78 3fl Ma Mixed alluvial land------------------------------------------- 18 VIw-2 78 2ol NeC Neilton very gravelly loamy sand, 2 to 15 percent slopes------ 19 VIs-1 78 3f3 Ng Newberg silt loam--------------------------------------------- 19 IIw-1 74 2ol Nk Nooksack. silt loam--------------=----------------------------- 20 _ IIw-1 74 2ol No Norma sandy loam---------------------------------------------- 20 IIIw-3 76 3w2 Or Orcas peat---------------------------------------------------- 21 VIIIw-1 78 --- Os Oridia silt loam---------------------------------------------- 21 IIw-2 75 awl OvC Ovall gravelly loam, 0 to 15 percent slopes------------------- 22 IVe-2 76 3d1 OvD Ovall gravelly loam, 15 to 25 percent slopes------------------ 23 VIe-2 78 3d1 OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-I 78 3d1 Pc Pilchuck loamy fine sand-------------------------------------- 23 VIw-1 78 2sl Pk Pilchuck fine sandy loam--------------------------------------. 23 IVw-1 76 2sl Pu Puget silty clay loam----------------------------------------- 24 IIIw-2 76 3w2 Py Puyallup fine sandy loan------=------------------------------- 24 IIw-1 74 2ol RaC Ragnar fine sandy, loam, 6 to 15 percent slopes---------------- 25 IVe-3 77 4sl RaD Ragnar fine sandy loam, 15 to 25 percent slopes-------------=- 26 VIe-2 78- 4sl RdC Ragnar-Indianola association sloping: 1 -------- 26 -------- -- Ragnar soil---------------------------------------------- -- IVe-3 77 4sl Indianola soil------------------------------------------- -- IVs-2 77 4s3 RdE Ragnar-Indianola association, moderately steep: 1/------------ 26 -------- -- Ragnar soil--------------------------------------------- -- VIe-2 78 4sl Indianola soil------------------------------------------- -- VIe-1 77 4s2 • U.S. GOVERNMENT PRINTING OFFICE:1973 o-468-266 GUIDE To MAPPING UNITS--Continued Woodland Described Capability unit group ap on mbol mbol Mapping unit page Symbol Page Sy -------------------=- 26 IIIw-1 75 3wl Re Renton silt loam----------------------- ----- 27 VIIIw-1 78 ------- Rh Riverwash--------------------------------------- ------- 27 IIw-1 74 201 Sa Salal silt loam-------------------------------------- Sh Sammamish silt loam----------------------------------------- 27 IIw-2 75 3w1 28 IIw-3 75 --- Sk Seattle muck------------------------------------------------ 29 IIw-3 75 Sm Shalcar muck------------------------------------------------ Sn Si silt loam------------------------------------------------ 29 IIw-1 74 3 w2 IIw-2 75 3 3w2 So Snohomish silt loam----------------------------------------- Sr Snohomish silt loam, thick surface variant------------------ 31 IIw-2 75 3w2 Su Sultan silt loam---------------------- -------------- 31 IIw-1 74 3w1 --- Tu Tukwila muck-------------------------------------------------- 32 IIw-3 75 UrUiban land-------------------=----------------------/ ------ 33 -------- -- --- Wo Woodinville silt loam-------------------------- ---------- 33 IIw-2 75 3w2 1/ The composition of these units is more variable than that of the others in the Area, but it has been controlled well enough to interpret for the expected use of the soils. • 4.0 RETENTION/DETENTION POND ANALYSIS AND DESIGN 4.0 RETENTION/DETENTION POND ANALYSIS AND DESIGN • There are no detention or water quality facilities required for this project. Please see Section 3.1 of this report for further details. • • 7585.005[DED/bq/kn] 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN • 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN There are no conveyance systems required for this project. Therefore, this section does not apply. • • 7585.005[DED/bq/knl 6.0 SPECIAL REPORTS AND STUDIES • 6.0 SPECIAL REPORTS AND STUDIES No special reports or studies have been required for this project. i • 7585.005[DED/bq/knl 7.0 BASIN AND COMMUNITY PLAN AREAS