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HomeMy WebLinkAbout03245 - Technical Information Report BAIMA & HOLMBERG INC. h N ; q �'��� - 3��s� �i TECHI�TICAL INFORMATION REPORT for Kennydale Grove Short Plat December 14, 2004 �✓I�itD 3/?glos �'UI�i�A �!�a145 ��UPE ���,� og wq O N �� o� , � - �l�` � -� � 11332 ��, ���sT��° ��'w �SIONAL � �i � E�IRES 11/30/06 I I � Baima & Holmberg, Inc. Job No. 1673-020 I Pre ared For P .j...� .:, � ' Basic Ventures fF-=��� : :� c�� 18211 240th Avenue SE Maple Valley,WA 98038 �.3Z•�.� 100 FRONT STREET SOUTH • ISSAQUAH • WASHINGTON • 98027-3817 • (425) 392-0250 • (425)391-3055 = c.�. TABLE OF CONTENTS 1. PROJECT OVERVIEW 2. CONDITiONS AND REQUIREMENTS SUMMARY 3. OFFSITE ANALYSIS 4. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 5. CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6. SPECIAL REPORTS AND STUDIES 7. OTHER PERMITS 8. ESC ANALYSIS AND DESIGN � 9. BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 10. OPERATIONS AND MAINTENACE MANUAL 1 SECTION 1 PROJECT OVERVIEW � � . \ \ �� ��y �o- ��,I� 1�� 1 �-> �" _ = '� PARCEL � 3224059081 �� � � � K / 2- � 8�;:�' VT , �'' , � � , �01 /� � �e� / ' • 4 � " if� :,�: •�p?;,. . � �90� 'CED •1YFlr. +�_ '4f / `9 - B�FlR�� .¢Cy �d, / 12-F R',�,�` 7'� �4 3 - � , ,._(i,�, o,r— o � - 'rF o6�� � ��.� o'►�� �z�`Fir+ F iYcmut�� oe– Vl �p' '� ��t �N,�j,l(.� /5'"-� � - PARCE 2405 y.`3t�o-- ���� � �� � "�,`�. 6�� 16'FlR� M112-- � 1 AI.DER �j `1 f_"-- � . UT�r�.. 18�: �R ,.�---- J o ir � �. G 5�"�'� Z •� �� a � ia– � � ,�� '' !r.�� SHED �na– PARCEL � 3224059041 � � i"��R � 4'Fllf'" � � B LDING 6. ��� 4 -� � � � ��� .� � is'nrt''�� .,, � C �E Q -� � �z � � te'CED��z��� FF�9 5 ,� C RPORT c� Q�� W CATCH BASIN ~� o " `. ( COK�E� � $ � � i� RIM=11�.93 0 �� OVERH�� f � . ,� INV=115.63.12"ADS S � � o GRAVEL '4 . 160.10' o � � � S 89'30 44 E ���� ,� �� 4� 3'WOOD FEN Z� , z4 � �` , - ! ��_.__ .�.___._ �: �" ,-- � EDGE OF ASPHAL _ `�„'_ — _ _ ' Ls- '' YOF ASPHALT � � � �, '_py_��...__ � . 'i. � N 40TH ST. � � _ ' 3 STORM MANHOLE STORM MANHOLE CATCH�BASIN R�M��22 9� RIM3118.69 RiM=118.66 Z INVa117.91,18"ADS S INV=114.44,8"CONC E INV=115.66,8"CONC W � INV=117.91,18'ADS W INV�113.39,18"CONC E � INV=113.39,12'CONC W INV=113.59,12'ADS N ; I � � i� � N Site Plan 1" = 50' Project Overview This project involves the development of a O.b9-acre parcel into four single-family lots. The site is located at 1424 North 40�` Street, at the northwest corner of North 40�' Street and Meadow Avenue North,. The site has a single residence and garage that will be removed. The reminder of the site is covered with la.wn with large trees. The site slopes down to the north-northwest at about 2%to 25%. Proposed Drainage Controls Because there will be greater than a 0.1-cfs increase in the 100-year runoff, flow control is required. An infiltration tank sized to control the 100-year storm event will provide the required flow control. Also because will be no more than 4,000 sq-ft of new impervious surfaces subject to vehicular, water quality controls aze not required. � REFERENCES Figure 1,page 2 of 2 City of Kent Public VVorks Department TECHNICAL INFORMATION REPORT(TIR)WORKSHEET � � � � REFERENCE LIMITATION/SITE CONSTRAINT ❑ ❑ ❑ Additional Sheets Attached . , . � . � . . MMIMUM ESC REQUIREMEN7'S MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION �l Sedimentation Facilities d Stabiliu Exposed Surface � Stabilized Construction EnUance �9 Remove and Rcstoro Temporary ESC Facilities Perimeter Runoff Control Q� Glean and Rcmove All Silt and Debris �CI Clearing and Grading Restrictions f�l Ensure Operation of Permanent Facilities �1 Cover Practices ❑ Flag Limits of SAO aad Opcn Space Preservadon Areas � Constiuction Sequence O Other ❑ Other . � . . • O Grass Lined lChannel � Tank 0 Infiltration Met d of Analysis ❑ Pipe System O Vault 0 Depression _ � Opcn Channel ❑ Encrgy Dissipata O Flow Dispersal Compenration/Mitigation � Dry Pond ❑ Wcdand ❑ Waiver of Eliminated Site Storage ❑' Wct Pond ❑ Strcam ❑ Rcgional Detention Brief Descxiption of System Operatibn: 1 L► Facility Related Site Limitations Reference Facility Limitation • � . . . . , . . . � il ❑ Cast in Place Vault O Othcr ❑ Drainage Easement ❑ Retaining WaU ❑ Access Easement . ❑ Rockery>4' High ❑ Native Growth Protection Easement • ❑ Structural on Steep Slope ❑ Tract ❑ Other . , . . � . . � � . , I or a civil engineer under my 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. � Si ned/Date City of Kent Surface Water Design Manual Chapter�—Kent ConsWction Standards S.R-7 May,2002 R�FEF.ENCES FIGURE 1,PAGE 1 OF 2 CITY OF KENT PUBLIC WORKS pEPARTMENT TECHNICAL INFORMATION REPORT (TIR) WORKSHEET ' . . � � i � � � � � , . � . � � . , , Project Owner"��� ���v�cR 5 Project Name �Y D�Q(,� -���/� Address 1 2 t — Location Phone � L �+ Township 2� Project Engineer Range � Company r' N� Section �2 Address/Phone � � , . � � � . , . � � . , . � . � . � Subdivision ❑ DFW HPA ❑ Shorelinc tvlanagunent '�Q, Short Subdivision ❑ COE 404 ❑ Rockcry � Grading ❑ DOE Dazn SaCety D Structural Vaults ❑ Commercial ❑ FEMA Floodplain O Othcr � Other ❑ COE Wetlands ' • ' � 1 1 • . ; . Community: � DrainaQe Basin: ' N�- G ��- G�� ulv�H��-k , . . , . . . ❑ Rivcc ❑ Floodplain ❑ Stream ❑ Wctlands O CYitical Stream Reach ❑ Seeps/Springs ❑ Depressions/Swales ❑ High Groundwater Table O [:ake ❑ Groundwater Recliargc ❑ Steep Slopes ❑ Other �% � . , . � Soil Type Slopes Erosion Potential Erosive Velocities O Additional Sheets Attached May,2002 S.R-6 ds � SECTION 2 CONDITIONS AND REQUIRMENTS SL;��IMARY . _ �6�3'��0 REPORT City of Renton Department of Planning/Building/Public Works 8c DECI SION ADM/NISTRATIVE SHORT PLAT RFPORT 8 DECISION � A. SUMMARYAND PURPOSE OF REQUEST: REPORT DATE: February 14,2005 Project Name Kennydale Grove Short Plat Owner. Basic Ventures, inc., 18211 240"'Ave.SE, Maple Valiey,WA 98038 Applicanf: Joe Pruss, Basic Ventures, Inc., 18211 240"'Ave. SE, Maple Valiey,WA 98038 Contact: Tom Redding, Baima& Holmberg, Inc., 100 Front St. So., Issaquah,WA 98027 File Number LUA-04-158,SHPL-A Project Manager Susan A. Fiala,AICP Project Description Administrative Land Use Action (Short Plat Review)for a four(4) lot subdivision of a 0.69- acre site located in the Residential - 8 Dwelling Unit Per Acre (R-8) zone. The proposed lots are intended for the eventual development of detached single-family homes. The lots range in size from 6,000 sq. ft. to 10,949 sq. ft. Access is proposed via N. 40th St. and a private access easement. The existing residence and all outbuildings would be demolished. Project Location 1424 N.40'"Street ----�-�_� f � =-- ,� , �+--+aTt��•— ---�n� -;—e� � �� � �� . RECEI�/ED }I _ . � �. _ _. ' _ ;p � ti �.� O ' � . 3 �E6 16 2�05 --���� � ; � , u�., � �_ ' — a . :..�.� � z - s BAIMA&HOLMBERG INC. ��, , � � � ,, C 1, f� ` �_ " �t / sTao �S'� E o � ` -- � � , , e °_ , �- � . � � � �i :` � .:; � • � - 9,i � ,# a+- � Q� ' ;� w� � � •� "' � ; . v� . $' � � - - « �.,, - �oa '�. . 0� "`E � — - ��D�` Z � AKE VI�AS -=- ;• � � . � . 3 . �oz ,s. � K •. 3ani i-:a.s�=- - � '� � , Q ��! � �,, isa; Projecf Location Map � _Q��N�?0 , , � ;���, 0 2 ��5: �� ieL_newRB.doc - - - --- --=�,,.r, - o !i City of Renton PIB/PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04-158,SHPL-A Page 2 B, GENERAL INFORMATlON: 1. Owner of Record: Basic Ventures, Inc., 18211 240th Ave. SE, Maple Valley,WA 98038 2. Zoning Designation: Residentiai–8 du/ac(R-8) 3. Comprehensive Plan Land Use Designation: Residential Single Family(RSF) 4. Existing Site Use: Existing single family residence and outbuildings to be removed. , 5. Neighborhood Characteristics: North: Undeveloped and wetiands (R-8 zone) Easf: Single Family Residential-(R-8 zone) South: Single Family Residential-(R-8 zone) West: Single Family Residen6al-(R-8 zone) 6. Access: North 40"'Street 7. Site Area: 30,147 square feet/0.69 acres C. HISTORICAUBACKGROUND: Action Land Use File No. Ordinance No. Date Comprehensive Plan N/A 4498 02/20/1995 Zoning N/A 4404 06/07/1993 Annexa6on N/A 2341 07/03/1967 D. PUBLIC SERVlCES: 1. Utilities Water. There is an existing 12-inch water main adjacent to the site. The site is within the 320-water pressure zone. The site is outside the Aquifer Protection Area. Sewer. There is an existing 8-inch sewer main in N 40th Street �-•�-#�����.�,r�`a, � <� Surface Water/Storm Water.The project is located in the May Creek drainage��a:t ����,: _- : : 2. Streets: The existing right of way along N 40th Street is partially improved (asph'alt paving and storm drainage,but no curb,gutter,street lights or sidewalk). 3. Fire Protection: City of Renton Fire Department �r" '--£���`�i "-��� � - '�':��'=` E. APPLICABLE SECTIONS OF THE RENTON MUNICIPAL CODE: 1. Chapter 2 Land Use Districts Section 4-2-020: Purpose and Intent of Zoning Districts Section 4-2-070:�oning Use Table — Section 4-2-110: Residential Development Standards 2. Chapter 4 Property Development Standards Section 4-4-030: Development Guidelines and Regulations 3. Chapter 6 Streets and Utility Standards Section 4-6-060: Street Standards 4. Chapter 7 Subdivision Regulations Section 4-7-070: Detailed Procedures for Short Subdivisions Section 4-7-120: Compatibility with Existing Land Use and Plan-General Requirements and Minimum Standards AdminRPT KennydaleGroveSHPL_r►ewR8.doc - City of Renton P/BlPW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04158,SHPL-A Page 3 Section 4-7-150: Streets-General Requirements and Minimum Standards Section 4-7-170: Residential Lots-General Requirements and Minimum Standards 5. Chapter 9 Procedures and Review Criteria F. APPL/CABLE SECTIONS OF THE COMPREHENSIVE PLAN: 1. Land Use Element—Residential Single Family 2. Community Design Element 3. Environmental Element G. DEPARTMENT ANALYSlS: 1. Proiect DescriptionlBackqround The applicant proposes to subdivide a 0.69-acre (30,147 square feet) parce� into four lots. An existing home and associated outbuildings on the site are proposed to be removed/demolished. Lot sizes proposed are: Lot 1 at 6,000 sq.ft.; Lot 2 at 6,599 sq.ft.; Lot 3 at 6,599 sq. ft. and Lot 4 at 10,949 sq. ft. The proposal for eventual development of four new single family residences would arrive at a density of 6.4 dwelling units per net acre (du/ac). The allowed density range in the R-8 zone is a minimum of 4.0 to a maximum of 8.0 dwelling units per acre. Access is proposed from N.40"'Stree� Lot 1 would be accessed directly and Lots 2, 3 and 4 would utilize a 26 ft.wide private access easement. The topography of the subject site slopes from the southeast to the north-northwest with grades ranging from five to 25 percent. All vegetation would be removed to accommodate construction of the building pads and utilities, except for those trees within new Lot 4 and the wetland buffer.An off-site Category 2 wetland is within 100 feet of the site and requires a 50 ft.wide buffer which would be contained in the northwest portion of new Lot 4. 2. Environmental Review Except when located on lands covered by water or sensitive areas, short plats are exempt from SEPA Environmental Review pursuant to WAC 197-11-800(6xa). 3. Compliance with ERC Conditions wa 4. Staff Review Comments Representatives from various city departments have reviewed the application materials to identify and address issues raised by the proposed development.These comments are contained in the official file, and the essence of the comments has been incorporated into the appropriate sections of this report and the Departmental Recommendation at the end of the report. __ 5. Consistencv Short Plat Criteria Approval of a plat is based upon several factors. The following short plat criteria have been established to assist decision-makers in the review of the plat: a) Compliance wifh the Comprehensive Plan Designation The site is designated Residential Single Family (RSF) on the Comprehensive Plan Land Use Map. The RSF designation is intended to promote and enhance single family neighborhoods. The proposal is consistent with the RSF designation in that it would allow for the future construction of new single family homes, thereby promoting goals of infill development. The proposal is consistent with the following Comprehensive Plan Land Use, Community Design and Environmental Element objectives and policies: AdminRPT KennydaleGroveSNPL newRB.doc _.- - City of Renton P/B/PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04158,SHPL-A Page 4 Objecfive LU-FF. Encourage re-investment and rehabilifafion of existing housing, and development of new residentia! plats resutting in quality neighborhoods that: 1) Are planned at ur6an densities and implement Growth Management fargets; 2) Promote expansion and use of public_trans�rtation; and 3) Make more effrcient use of urban services and infrastrucfure. The _ - ------ project would add four new residential lots in an existing neighborhood that has existing infrastructure including a street system. Policy LU-147. Net developmenf densities should fall within a range of 4.0 to 8.0 dwelling units per net acre in Residenfia! Single Family neighborhoods. The proposed project for four lots would anive at a net density of 6.4 dwelling units per net acre which is within the allowable range of the R-8 zone. Policy LU-148. A minimum!ot size of 5,000 square feet should be allowed on in-fill parcels of less fhan an acre (43,560 sq. ft) in single-family designations. Allow a reduction in lot size to 4,500 square feet on parcels greater fhan an acre to cr�ate an incentive for aggregation of land. The site is less than one acre and all four lots would be equal to or greater than 5,000 sq. ft. after the deduction of the private access easement for Lots 2 and 3. Policy LU-149. Lof size should exc/ude privafe sidewalks, easemenfs, private road, and driveway easements, excepf a!!ey easements. Lot sizes for new Lots 2 and 3 exclude the private access easement and compty with lot size after the deduction. Policy LU-150. Required setbacks should exclude public or privafe/ega!access areas, established through or fo a bt, and parking areas. The short plat plan shows the required setbacks from the access easement and are in compliance with the undertying zoning of R-8. Objective CD-C. Promofe re-investmenf in and upgrade of existing neighborhoods through redevelopment of sma/l, unden,tilized parcels, modificafion and a/terafion of older housing sfock, and improvements to sbeets and sidewalks to increase propeify values. The proposal will increase i the number of units currently existing on the site by creating four lots. The proposal will also be include construction of frontage improvements along the front of the property consisting of curb, gutter, and sidewalk, unless deferred by the Board of Public Works which has been approved with II conditions. Policy CD-12. lnfil! development, defrned as new short plats of nine or fewer /ots, should be encouraged in order fo add variety, updated housing sfock, and new vifality to neighborhoods.The proposal will increase the number of units within the neighborhood by creating four lots. Objective EN-D: Preserve and protect wetlands for overa/l sysfem functioning. The applicant would provide the required 50 ft. buffer for the off-site Category 2 wetland. Policy EN-90. Establish and protect buffers along weflands to facilitate in5/tratiort.... The applicant would provide the required 50 ft.buffer for the off-site Category 2 wetland. - - - - -- Policy EN-28. Minimize on-site erosion and sedimentation during and after construction. As a — - condition of short plat approval,-the applicant will be required to adhere to the erosion and-- sedimentation control measures as outlined in the DOE 2001 manual. b) Compliance with the Underlying Zoning Designation The subject site is designated Residential—8 Dwelling Units per Acre (R-8)on the City of Renton Zoning Map.The proposed development would allow for the future construction of four new single family dwelling units. The allowed density range in the R-8 zone is a minimum of 4.0 to a maximum of 8.0 dwelling units per acre. Net density is calculated after the deduction of sensitive areas, areas intended for public right-of-way and private easements from the gross acreage of the site. The property does not AdminRPT KennydaleGroveSHPL newRB.doc — - City of Renton PB/PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04158,SHPL/1 Page 5 contain any sensitive areas but does require the deduc6on of 3,120 squa�e feet for the private access easement from the gross site area. After the deduction of 3,120 sq. ft. from the 30,147 sq.ft. site—gross (30,147 sq. ft. —3,120 sq. ft. = 27,027 net-sq.--ft�/ 0.62 net acres), the proposal would arrive at-6�t dwelling-units per acre (4 units/0.62 acres = 6.4 dulac),which is within the allowed range. The allowed building lot coverage in the R-8 zone is 35 percent or 2,500 square feet whichever is greater for lots equal to or greater than 5,000 square feet in size and lots less than 5,000 square feet are allowed a maximum of 50%lot coverage. Building setbacks as required by the R-8 zone, include a front yard setback of 15 feet, for the primary structure and 20 ft. for attached garages accessed from either the front or side yard. The side yard along a street setback is 15 ft.for the primary structure and 20 ft.for the attached garage accessed from either the front or side yard along a street.The minimum interior side yard setback is 5 feet and 20 ft.for the rear yard. The setbacks shown on the short plat plan appear to comply with these standards. Compliance with these development standards will be ver�ed at the time of building permit submittal and review. Each lot would have adequate area to provide finro off-street parking spaces as required by the parking regulations. The R-8 zone permits accessory structures only when associated with a primary structure located on the same parcel. All structures that currently exist on the site would be removed/demolished. Staff recommends as a condition of short plat approval that the applicant obtain a demoli6on permit and complete all inspections and approvals for all buildings located on the property prior to recording of the final short plat. The R-8 zone requires off-site landscaping abutting non-arterial public streets (N. 40�' Street). A five ft (5 ft.) wide irrigated or drought resistant landscape strip is to be installed and if there is addi6onal undeveloped right-of-way in excess of frve feet, this additional width must alsa be landscaped. Additionally, at least two trees of a City approved species with a minimum caliper of 1%z inches per tree shall be planted in the front yard or planting strip of every lot prior to occupancy. c) Compliance with Subdivision Regulations Streets: The existing right of way along N 40�' Street is partially improved (asphalt paving and . stoRn drainage, but no curb, gutter, street lights or sidewalk). Per code, the street frontage requires street improvements including but not limited to: pavement, sidewalk, street lights and curb and gutter unless deferred by the Board of Public Works (BPW). Tfie applicant requested a deferral of improvements to the BPW and was approved a deferral with a Security Device (cash set-aside)subject to conditions, on January 26,2005. The proposed short plat is anticipated to generate additional traffic on the City's street system. In order to mitigate transportation impacts, staff recommends a condition of approval be placed on _ _ _. , the project requiring a Transportation Mitigation Fee based on $75.00 per net new average daily � --- trip attributed to the project.The three new lots, credit given for the existing residence, is expected - - to generate approximately 9.57 new average weekday trips per lot with credit given for the existing residence. The fee for the proposed short plat is estimated at $2,153.25 ($75.00 x 9.57 trips x 3 lots=$2,153.25)and is payable prior to the recording of the short plat. ' Blocks:No new blocks will be created as pa�t of the pr�posed sho�t plat. Lots: The minimum lot size permitted in the R-8 zone is 5,000 square feet for parcels less than one acre-gross. The proposed plat would create four lots, which are proposed as: Lot 1 at 6,000 sq. ft.; Lot 2 at 6,599 sq.ft.(5,039 sq.ft. net after easement deduction); Lot 3 at 6,599 sq.ft. 5,039 sq. ft. net after easement deduction); and Lot 4 at 10,949 sq. ft. The proposed lot sizes are compatible with other existing lots in this area under the same R-8 zoning classification. �_ � AdminRPT KennydaleGroveSHPL newR8.doc _. � - City of Renton P/B/PW Department Administrative Land Use Actlon REPORT AND DECISION DATED February 14.2005;LUA-04-158,SHPL-A Page 6 The proposed lots also comply with the R-8 requirements for minimum lot width (50 feet for interior lots and 60 feet for comer lots). The minimum lot depth of 65 feet is achieved by the four lots and thus complies with these development standards. All lots appear to have adequate building area for the construction of single-family residences when taking setbacks and lot coverage _ — -- -- _ ---- requirements into consideration. ' The size, orientation and arrangement of the proposed lots comply with the requirements of the Subdivision Regulations and the development standards of the R-8 zone. c� Reasonableness of Proposed Boundaries Access: Lot 1 would have direct access to a public right-of-way, NE 40"' Street. Lots 2, 3 and 4 w�uld be accessed via a private access easement(26 ft.wide with 20 feet of pavement). Staff recommends the establishment of a maintenance agreement for all common improvements, , inGuding but not limited to:utility and access easements, as a condition of short plat approval. Topography:The topography of the site is slopes from the southeast down to the northwest. The south portion of the site has a slope generally less than five percent with the slope increasing in steepness to 20 to 25 percent in the north portion. Only those slopes that range from 25 to 40 percent are classified as sensitive slopes.The slopes within Lot 4 are class�ed as sensitive slope and thus the standards of RMC 4-3-050.J.6. apply to development occurring on these sensitive slopes. The standards include: erosion control plans, on-site inspections and specified conditions of approval (as noted within this report). All vegetation would be removed for the proposed sho�t plat development, except for those trees located within the wetland buffer and along the north/northwest property line of Lot 4 which are proposed to be retained. These trees to be retained include cedars and firs. Twenty-six trees, � ranging from 6-inch to 30-inch dbh would be removed within the site. There are also several firs and cedars within the right-of-way that would be removed, inGuding a 36-inch dbh cedar. A Geotechnical Engineering Report was submitted with the land use application as prepared by Dennis Joule, P. E.,dated December 13, 2004. The repo�t's review was included review of surface and subsurtace conditions,site preparation, and foundations. The site is mapped as Indianola sand loam by the US Soil Conservation Service. The soil testing indicated that the site is unde�iain by Gean to silty, medium dense sand. No groundwater, wet soil or color mottling was encountered in the test pits. The report continues that site soils are very prone to erosion and cohesionless and exposed sloping ground should be immediately covered with visqueen. Due to the potential impacts of erosion and sedimentation from project construction, staff recommends the following erosion � control measures as conditions of project approval: • Temporary Erosion and Sedimentation Control (TESC) shall be installed and maintained according to the standards set-forth in the Department of Ecology Erosion Control Standards. • The project shall be designed and comply with Department of Ecology's Erosion and Sediment Contro! Requirements as outlined in Volume II of the 2001 Stonnwater Management Manual. Building foundations were discussed and the report indicates that the residential buildings may be supported on conventional shallow foundations bearing on firm natural soil or compacted structural fill. Within new Lots 3 and 4, the applicanYs consultant recommends that no individual piers be used and a licensed geotechnical engineer review the building plans at the time of building permit review. Staff recommends as a condition of approval that at the time of building permits, additional geotechnical studies are to be completed that address building foundations. Wetlands: The applicant submitted a wetland reconnaissance prepa�ed by Altmann Oliver Associates, LLC, dated January 25, 2005. The reconnaissance identified one off-site wetland to the north of the subject short plat and within 100 feet. The off-site wetland meets the criteria for a AdminRPT KennydaleGroveSNPL_newR8.doc = _ � s� City of Renton P/B1PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04-158,SHPL-A Page 7 Category 2 wetland and requires a 50 foot buffer. A portion of the buffer extends on site and within new Lot 4.The applicant has shown the required buffer on the short plat plan. ; Staff recommends as a condition of approval that the brightly colored construction fencing along -.- — the edge of the wedand buffer-be-installed prior to project construction. This condition would ensure the wetland buffer is not disturbed during project construction. In addition, staff recommends that the applicant be required to construct a split-rail or other approved fence and place signage indicating the presence of an environmentally sensitive area in order to denote the edge of the wetland buffer. Lastly, staff recommends that the applicant place the wetland buffer within a Native Growth Protection Easement (NGPE), which would ensure the area is left in a natural and undisturbed state. Relationship to Existing Uses:Single family residential surrounds the subject plat as developed under the City of Renton regulations. The proposal is similar to existing development pattems in the area and is consistent with the Comprehensive Plan and Zoning Code, which encourage residen6al development. e) Availability and Impact on Public Services(Timeliness) Police and Fire: Police and Fire Prevention staff indicate that sufficient resources exist to fumish services to the proposed development, subject to the condition that the applicant provide Code required improvements and fees.A Fire Mitigation Fee, based on$488.00 per new single family lot with credit given for the existing single family residence, is recommended in order to mitigate the proposal's potential impacts to City emergency services. The fee is estimated at $1,464.00 ($488.00 x 3 new lots=$1,464.00)and is payable prior to the recording of the short plat. Schools: According to the Draft Environmental Impact Statement for the City of Renton Land Use Element (January 16, 1992), the City of Renton has a student generation factor of 0.44 students per single family residential dwelling. Based on the student generation factor, the proposed short , plat would result in one or two additional students (0.44 X 3 lots = 1.32) to the local schools (Kennydale Elementary, McKnight Middle School and Hazen High School). The Renton School District has indicated that these schools can accommodate the additional students generated by this p�oposal. Storm Water.The applicant submitted a Preliminary Storm Drainage Technical Information Report prepared by Baima & Holmberg, Inc. dated December 14, 2004 with the land use application. The report states that there is little to no upstream runoff onto the site. The downstream analysis indicates that runoff from the site sheet flows north-northeast from the site onto the adjacent parcel. This flow continues about 250 ft. down the adjacent 25 percent slope to May Creek. May Creek continues northwest for about 900 ft. where it goes under Lake Washington B(vd and the � BNSF railroad tracks, flowing southwest onto the Barbee Mill property. Approximately 4/10�' of a mile downstream of the site, May Creek discharges into Lake Washington. The report states there are no apparent downstream problems and there will be less than a 0.1 cfs incxease in the 100 year runoff, detention is not required.There would be no more than 3,200 sq. ft. of new impervious � surfaces subject to vehicular traffic, thus water quality controls are not required. Dispersion is - " being proposed. - The-Geotechnical Report stated that drainage should not be discharged on or near the top of the slopes. The report also discussed preliminary soil infiltration which indicates that the soils are j conducive to infiltration. Staff recommends as a condition of approval that that the final design for drainage from the houses and driveways utilize either infiltration or direct discharge to an approved discharge point. The proposed loca6ons of the dispersion trenches are shown on the plan. The dispersion trench within Lot 4 would drain to the off-site wetland.The runaff from Lot 1 could be piped, similar to Lots I 2 and 3 in lieu of the dispersion trench. AdminRPT KennydaleGcoveSHPL newRB.doc � �' City of Renton P/B/PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04158,SHPL-A Page 8 Due to downstream flooding and erosion probtems, the project is to be designed per the 1998 King County Surface Water Drainage Manual. Staff recommends this as a condition of short plat approval. The System-Development Charge will be at the cuRent rate of $715.00-per-new-single family lot. The fee is payable at the time of issuance of the utility construction permit. Water and Sanitary Sewer Utilities:There is an existing 12-inch water main adjacent to the site. � Water service "setters" are required to be provided prior to recording of the sh�rt plat. A system development charge of $1,525.00 per single family.lot is required and payable at the time of issuance of the utility construction permit. There is an existing 8-inch sewer main in N 40"' Street. Dual side sewers are not allowed. Each new lot must be served with an individual side sewer. Sewer stub-outs must be installed prior to the recording of the short{�lat. A System Development Charge of $900.00 per each new lot is required.This fee is payable at the time of issuance of a utility construction permit. H. Findings: Having reviewed the written record in the matter, the City now enters the following: 1. Requesf: The applicant has requested Administrative Short Plat Approval for the Kennydale Grove Short Plat, File No. LUA-04-158,SHPL-A. 2. Application: The applicant's short plat application complies with the requirements for information for � short plat review. The applicanYs short plat plan and other project drawings are contained within the official land use file. 3. Comprehensive Plan: The subject proposal is consistent with the Comprehensive Plan land use 'I designatian of Residential Single Family(RSF). 4. Zoning: The proposal as presented complies with the zoning requirements and development standards of the Residential Single Family-8 (R-8)zoning designation, provided all advisory notes and conditions of approval are complied with. 5. Subdivision Regulations: The proposal complies with the requirements established by the Cit�s Subdivision Regulations provided all advisory notes and conditions are complied with. 6. Existing Land Uses: Land uses surrounding the subject site include: North: Residen6al Single Family (zoned R-8); East: Residential Single Family (zoned R-8); South: Residen6al Single Family (zoned R-8); and West: Residential Single Family(zoned R-8). 7. System Development Charges: A Water System Development Charge, a Surface Water System Development Charge and a Sewer System Development Charge, at the current applicable rates, will be required for the each new single-family residence as part of the construction permit. 8. Public Utilities:The applicant will be required to install individual sewer and water stubs to serve the new lots. In addition, all existing and new fire hydrants serving the plat must be fitted with Storc fittings. -l. --- Conclusions: ---- - 1. The subject site is located in the Residential Single Family(RSF)comprehensive plan designation and complies with the goals and policies established with this designation. 2. The subject site is located in the Residential — 8 Dwelling Units Per Acre zoning designation and complies with the zoning and development standards established with this designation provided all advisory notes and conditions are complied with. 3. The proposed four lot short plat complies with the subdivision regulations as established by city code and state law provided all advisory notes and conditions are complied with. �AdminRPT KennydaleGroveSHPt newRB.doc - — City of Renton P/BlPW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04158,SHPL-A Page 9 4. The proposed four lot short plat complies with the street standards as established by city code provided the conditions of the approved deferral for street improvements are complied with. J. DECISION: The Kennydale Grove Short Plat, File No. LUA-04-158, SHPL-A is approved subject to the following conditions: 1. The applicant shall obtain a demolition pennit and complete all inspections and approvals for all buildings located on the property prior to recording of the final short plat. The satisfacfwn of this requirement is subject to the review and approval of Development Services. 2. The applicant shall pay the required Transportation Mitigation Fee at the rate of $75.00 per net new average daily trip associated with the project. Credit given for the existing single family residence. The Transportation Mitigation Fee shall be paid prior to the recording of the short plat. 3. A maintenance agreement shall be created concurrently with the recording of the short plat in order to estabtish maintenance responsibilities for all shared improvements. 4. Temporary Erosion and Sedimentation Controt (TESC) shalf be installed and maintained according to the standards set-forth in the Department of Ecology Erosion Control Standards. 5. The project shall be designed and comply with Department of Ecology's Erosion and Sediment Control Requirements as outlined in Volume II of the 2001 Stormwater Management Manual. 6. At the time of building permits, additional geotechnical studies are to be completed that address building foundations for new Lots 3 and 4. The applicant shall be required to place a note on the face of the final short plat noting this requirement This condition shall be subject to the review and approval of the � Development Services Division. 7. The applicant shall be required to install brightly colored construction fencing along the edge of the , wetland buffer prior to project construction. 8. The applicant shall be required to erect a spilt-rail fence or other fence type as approved by the Development Services Division along the edge of the wetland buffer boundary prior to recording of the short plat. A sign shall be located along the fence indicating the presence of the wetiand and its associated buffer. 9. The applicant shall be required to record a Native Growth Protection Easement for the wetiand buffer located in new Lot 4 in conjunction with final short plat approval. This condition shall be subject to the review and approval of the Development Services Division. 10. The applicant shall pay the required Fire Mitigation Fee equat to $488.00 per new single family bt with credit given for the existing single family residence. The Fire Mitigation Fee shall be paid prior to the recording of the short plat. 11. The final design for drainage from the houses and driveways shall utilize either infiltration or direct discharge to an approved discharge point.This condition shall be subject to the review and approval of the Development Services Division at the time of utility construction permits. 12. The storm drainage plan shall comply with the 1998 King County Surface Water Design Manual. DATE OF DECISION ON LAND USE ACTION: SIGNATURES: � /v�' "� G✓e Zn�i�t✓,y1u�� 2 Iy �5 GreggA.Lmmerman,P/8/PWAdministrafor decision date AdminRPT KennydaleGroveSHPL newR8.abc _ City of Renton PB1PW Department Administrative Land Use Action REPORT AND DECISION DATED February 14,2005;LUA-04-158,SHPL-A Page 10 ADVISORY NOTES TO APPUCANT The following nofes are supplemenbl fnformatlon provided ln conjunctlon wifh the adminlstrative land use actlon. Because these notes are_prQ��as.informatfon only, they are not subject to the app�al p1�F��s_fs�r the land use actions. Planninq 1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless otherwise approved by the Development Services Division. The Development Services Division reserves the right to rescind the approved extended haul hours at any time if complaints are received. 2. Commercial, multi-family, new single family and other nonresidential construction activities shall be restricted to the ', hours between 7:00 a.m.and 8:00 p.m., Monday through Friday.Work on Saturdays shall be restricted to the hours I between 9:00 a.m.and 8:00 p.m. No work shall be permitted on Sundays. 3. At least two trees of a City approved species with a minimum caliper of 1 %2" per tree shall be planted in the front yard or planting strip of every lot prior to occupancy. i Property Services , See attached comments. Fire 1. A fire hydrant with 1,000 GPM fire flow is required within 300 feet of all new single family structures. If the building square footage exceeds 3,600 sq.ft. in area,the minimum fire flow increases to 1,500 GPM and requires two hydrants within 300 feet of the structures. j 2. Fire Department access roads are required to be paved of a 20 foot width. 3. Street addresses shall be visible from a public street. Plan Review-Storm/Surface Water 1. The drainage plan must comply with the 1998 IGng County Surface Water Design Manual, and with the Geotechnical Report recommendation and conditions. The Geotechnical Report submitted with the Land Use applica6on states tliat drainage should not be discharged on or near the top of the slopes. This statement appears to conflict with the proposed location of dispersion trench(s)shown on the design plans. 2. The System Development Charge is �715 per new single-family building lot This fee is due with the construction permit. 3. Temporary erosion control is required to meet Department of Ecology Standards. Plan Review-Sewer 1. The System Development Charge is $900 for each new single-family building lot being served with a new sewer service. This fee is due with the construction permit. 2. Separate side sewers (and any necessary easements) to each new building lot are required prior to recording of the plat. Plan Review-Water 1. New water senrice"setters"will be required to be installed prior to recording the plat. 2. All new single-family construction must have a fire hydrant capable of delivering a minimum of 1,000 gpm and must be�located within 300 feet of the structures. There does appear to be an existing hydrant in the vicinity that may be counted toward the fire protec6on for this project. Verification that this existing hydrant is within 300 feet of all homes is required. Any existing sub-standard hydrants will need to be replaced and/or retrofitted with a quick disconnect Storz fittings. 3. Verify that the new water service line to serve proposed lot 4 will provide adequate water pressure (with consideration for a potential Fire Sprinkler System, if required). ---.- -..--- - 4. The System Development Charge is $1,525 for each new single-family building lot. This fee is due with the construction permit. -- Plan Review-StreetslTransportation 1. This project is required by City Code to install frontage improvements. Improvements include half pavement width, curb, gutter, streetlights and sidewalks along the existing right of ways and any new internal streets that are fronta e to the site. A deferral has been re uested and a roved with conditions. AdminRPT KennydaleGroveSHPL_newRB.doc -- - City of Renton P/B/PW Department Administrative Land Use Action ' REPORT AND DECISION DATED Febniary 14,2005;LUA-04-158,SHPL-A Page 11 TR.4NSMITTED this 14"'day of February, 2005 to the Owner. Basic Ventures,Inc. 18211 240"'Ave.SE Maple Valley,WA 98038 __------- _ _---- -- -- TRANSMlTTED this 14"' day of February,2005 to the Applicant: Jce Pruss Basic Ventures,Inc. 18211 240�'Ave.SE Maple Valley,WA 98038 TRANSMITTED this 14"' day of Fe6�ary, 2005 to ti►e Contact: Tom Redding Baima&Holmberg,Inc. 100 Front St So. Issaquah,WA 98027 TR.4NSMITTED fhis 14"' day of Febnrary, 2005 to the Pariies of Record: Dottie Adkins Greg Fawoett 1417 N 40th St PO Box 402 Renton,WA 98056 Fap City,WA 98024 Larry&Cira Reymann Susan Phelan 1313 N 38th St�� PO Box 8 Renton,WA 9sb- �f��I Renton,WA 98057 T� TRANSMITTED this 14"' day of February,2005 to the fo!lowing: Larry Meckling,Buiiding Official Stan Engler,Fre Marshal Neil Watts,Development Servk:es Director Jennffer Henning Jan Conklin Carrie Olson Lawrence J.Warren,City Attomey South County Joumal Land Use Action Appeals 8 Requests for Reconsideration The administrative land use decision will become final if the decision is not appealed within 14 days of the effective date of decision. M appeal of the decisan must be filed within the 14-day appeal period(RCW 43.21.C.075(3);WAC 197-11-680). RECONSIDERATION. Within 14 days of the effective date of the decision, any party may request that a decision on a short plat be reopened by the Administrator.The Administrator may modify his decision if material evidence not readily discoverable prior to the original decision is found or'rf he finds there was misrepresentation of fac�t. After review of the reconsideration request, if the Administrator finds insufficient evidence to amend the original decision,there will be no further extension of the appeal period. Any person wishing to take further action must file a formal appeal within the following appeal timeframe. APPEAL. This administrative land use decision will become final if not appealed in writing to the Hearing Examiner on or before-5:00 PM on February 28, 2005. Appeals to the Examinerare govemed by City of Renton Municipal Code Section 4&110. Additional information regarding the appeal process may be obtained from the Renton City Clerlc's Office, (425)43a6510. Appeals must be filed in writing,together with the required$75.00 applica6on fee,to: Hearing Examiner,Ciry of Renton, 1055 South Grady Way,Renton,WA 98055. EXPIRATION DATE: The Short Plat approval will expire iwo(2)years from the date of approval. An extension may be requested pursuant to RMC section 4-7-080.M. AdminRPT KennydaleGroveSHPL_n�wRB.doc _ r � a nf .,.� .., �S�,*, � ,�!'f�� � � �J�� �f�� , � •�` Y/f���J���lii�1{I`;��;.a�((���.;' ,, '!71 � k��"� 1 y�""II'�7-Y� r� ��J � !�^t: �r7 �Iq ��� • , �3 _ = �J� �� , ., .. ,. 4. 1�-.� , �:,,;� � �� �� � .�� � .• • � �fl•!�Ai��� y� " ...�� � � iii�(� L� , .d .- � � �� , �z��ic �z�� �' �'i��: �� `-��-� .: ��,��►�j- . .� � , --in�� ���• � Y'�, � •�•! �t� �� � � � � h ����e ��1 �:�'� 1J" ". ��r��� � , � �". � �,, r�,.� ll � I/ �I ��. f�'� • . �� � � �� �. � : �, y.� �, �',��!�� : ,! � �.;� ■ � ,. :� �'� �_3 -• �" ��� �r�: ���A� � .�� �+�i� �—�� e�' �' ��. ��• r � `�-�• . � t.� �� ►• � r �y � 't'��• _, � � �'�� '� � ,:E� . 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I ' 'I � ; ' i � �R_g; ----�-�8;�! � t--:�-�-;� i- _ i E — — � �%T�, ,-� _ � ; � R-t � '; � N 2��th: S� � .. _:.�i� � ' �t�—I��_ — –,� `i I t � -- — — i �`_'- R � �� 3 � � � � � ! � i i i�� � I � RTS � 11pp _ — �_ —v � ___ € E '/ _�'. _�� \ � i / � � t '-�` �-- -- ° z°° `°° C3 ZOIVING ---- ���b�w � ' � ' r�rw x�c.�cei.asAvx� F �+ _ �N 31 T24N R5E E 1/231 i _ ---- _ -- -- � CITY OF RENTON PLANNING/BUILDING/PUBLIC WORKS MEMORANDUM DATE: February 4,2005 TO: Susan Fala FROM: Sonja J.Fesser `�� J ! SUBJEGT: Bennydale Grove Short Plat,LUA-04-15&SHPL Format and Legal Description Review Bob Mac Onie and I have reviewed the above referenced short plat submittal and have the following comnnents: Comments for the Applicant: . Pacific Northwest Tide Company Short Plat Certificate,Order No.580867,dated December 6, 2004,notes that Basic Ventures,Inc.is the vested owner of the subject short plat properfy. Currently,Jeff Long,Francis Long,Meadow LLC and Pinnacle Lending Corp. aze noted under the"Certification"block. Revise as needed. � Inforn�ation needed for f�lal short plat approval includes the following: Note the City of Renton land use action number and land record number,LUA-04-158-SHPL and LND 20-0404,respectively,on the drawing in the spaces already provided. Include"CTTY OF _ RENTON,KING COIiN'TY,WASHINGTON" - The overall distance noted between City of Renton Mon#s 1866 and 266 on the"CONTROL" map(2633.69')differs from the sum of the two smaller dimensions noted for the same length by a tenth. Provide short plat and lot closure calculations. Note the bearings for all the interior boundary lines of the proposed lots. W:�File Sys1LND-Lw�d Subdivision&Sucveying RecordslLNLI-2(?-Shat P1a1s�Q4Q4VtVQ50131.doc February 4,2005 Page 2 Note the dates the existing monuments were visited,per WAC 332-130-150,and what was found. Indicate what has been,or is to be,set at the comers of the proposed lots. Note discrepancies between bearings and distances of record and those measured or calculated,if any. Note all easements,covenants and agreements of record on the drawing,if any. The city will provide addresses for the proposed lots as soon as possible. Said addresses need to be noted on the drawing. On the final short plat submittal,remove all references to trees,utility facilities,topog lines and other items not directly impacting the subdivision. These items are provided only for preliminary . short plat approval. Note on the drawing that the adjoining properties to the east,west and north of the subject shoR plat are unplatted. Remove references to zoning and density items on the drawing. Note that if there are restrictive covenants,easements or agreements to others(City of Renton, � neighboring property owners,etc.)as part of this snbdivision,they can be recorded concurrendy with the short plat. The short plat drawings and the associated document(s)are to be given to the Project Manager as a package. The short plat document will be iecorded first(with King County). The recording number(s)for the associated document(s)(said documents recorded concurrendy with,but following the short plat)need to be referenoed on the short plat drawings. A new 26' private ingress,egress and utilities easement over Lots 2 and 3 is shown forthe benefit of Lots 3 and 4. Since the new lots created via this shoct plat are uc�der common ownership at the � . time of recording,tbere can be no easement until such time as ownership of the lots is conve ed �,�� � to others,together with and/or subject to specific easement rights. Said 6' private ingress,egress and utilities easement requires a"NEW PRIVATE EASEMENT FOR INGRESS,EGRFSS & LJ'TII,TTIES MAINTFNANCE AGREENIII�IT"block to be noted on the drawing. See the attachment. Fee Review Comments: � � The Fee Review Sheet for this review of the preliminary short plat is provided for your use and information. H:\Fle Sys\L,ND-Land Subdivision dc Surveying Records�iND-20-Short Plats\0404UtV050131.docicor Title for both of the following para�raphs: NEW PRNATE EASEMENT FOR INGRESS,EGRESS &UTII.TTIES --- � MAIIVTENANC'E AGREEMENT � � Use the following paragraph if there are two or more lots participating in the agreement: NOTE: NEW PRIVATE EXCLUSIVE EASEMENT FOR INGRESS,EGRESS AND � UTILITIES IS TO BE CREATED UPON TI�SALE OF LOTS SHOWN ON THIS SHORT PLAT. THE OWNERS OF LOTS SHALL HAVE AN EQUAL AND UNDIVIDED INTEREST IN THE OWNERSHIP AND RESPONSIBILTTY FOR MAINT�NANCE OF THE PRNATE ACCESS EASEMENT APPURTENANCES. T�.SE APPURTENANCFS AND��,AIN'TENANCE RESPONSIBILTTIES INCLUDE THE REPAIR AND rZAINTENANCE OF TI� PRIVATE ACCESS ROAD,DRAINAGE PIPES,AND STORM�WATER QUALTTY AND/OR DETENTION FACII.TTIF.S VVITHIN'I��.S EASEMENT,PRIVATE SIGNAGE,AND OTHER INFRASTRUCTURE NOT OWNED BY TI�C1TY OF RENTON OR OTHER UTILTTY PROVIDERS. MAINTENANCE COSTS SHALL BE SHARID EQUALLY. PARI�NNG ON TI�PAVING IN THE ACCESS EASEMENT IS PROHIBTTED, LJI�II,FSS PAVEMENT WIDTH IS GREATER THAN 20 FEET. Use the following paragraph if there is one lot subject to the agreement: ; NOTE: NEW PRNATE EXCLUSNE EASEMENT FOR INGRESS,EGRESS AND UTILTTIFS IS TO BE CREATED UPON THE SALE OF LOTS SHOWN ON THLS SHORT PLAT. 'THE OWNER OF LOT - SHALL HAVE OWNERSHIP AND RESPONSIBILITY FOR MAINTENANCE OF THE PRIVATE ACCESS EASEMENT APPURTENANCFS. THESE APPURTENANCES AND btiAINTENANCE RESPONSIBII,TTIES INCLUDE THE REPAIlt AND MAINTENANCE OF T�-�E PRNATE ACCESS ROAD,DRAINAGE PIPES, AND STORM WATER QUALITY AND/OR DETENTION FACILTTIES WITHIN THIS EASEMENT,PRNATE SIGNAGE,AND OTf�R TNFRASTRUCTURE NOT OWNED BY THE C1TY OF RENTON OR OTHER UTILTTY PROVIDERS. I��IAAINTENANCE COSTS SHALL BE SHARED EQUALLY. PARKING ON THE PAVING IN THE ACCESS EASEMENT IS PROHIBTTED,UNI�ESS PAVEMENT WIDTH IS GREATER THAN 20 FEET. � PROPERTY SERVICES FEE REVIEW FOit SUBDIVISIONS No. 20U5- oS - APPLICANT: SI y������ SI.1C. RECEIVED FROM (date) JOB ADDRFSS: 142.�. 1J. .dC37�-�_ S`�1�-T WOfi 'y'�3r�,.1 NATURE OF WORK:.d.•�� ��� I (��Ybd,� �' Gf�V��t�L.� LND� ?n -�.dO.d. )( PRELIMINARY REVIEW OF SUBDIVLSION 7 LONG PLAT, NEED MORE INFORMATION: ' LEGAL DESCRIPTION SI�ORT PLAT,BINDING STTE PLAN,ETC. - PID B's ' VICINTTY MAP ' FINAL REVIEW OF SUBDIVLSIOAI,-'FHLS REV�W REPLACES " SQUARE FOOTAGL -- �—-- OTfiER � PRELIMINARY FEE REVIEW DATED ` FRONT FOOTAGE SIJBJECT PROPERTY PARENT PID� �224{��'j�9�r�„�, j( NEW KING CO.TAR ACCT.�(s)are required when assigned by King Cou�ty. It is�e iruent of this deveiopme�fee analysis io pvt dx developu/mmer on�otice,that the fess quo�ed bdow may be applicabk to t6e subjxt site upon developrtient of d�e properry. All quoted fees are poterKial chargu dnt may be due and pnyabk at the time the constnrctioe permit is iswed W insaQ die oa-sit+e ud • off-site improvemeots(i.e.underground utilities,street iroprovemer�ts,ac_) Triggering mectianismt fo�d►e SDC fees will be based on current Ciry ordimKcs and dctermincd by the applicabk Lhility Scction_ Please note that dux fecs are wbjxt m change wittaut aotice. Finat feac will be based on nocs in effeu at rirt�e of Bw7d'u�g Permit/Conuroctan Permic applicatioa • • ' The existing house on SP Lot A� ,addressed as 6as not pnviously paid SDC fees,due to connection to Cit�utilitia prior to e�ustance of SDC[ee Ord. SP Lot� will be subject to future SDC fces if triggering mechanisms are touched within currwt City Ordinanoes. ' Wc understand that this subdivision is in the prdimir�ary stage and that we will have the opportunity to review it again before recordatan. The followin uoted fees do NOT i�lude ins ion fees,side sewer cmits,r/w it fees or the cost of water meters. SPECIAL ASSESSMF.NT DLSTRICT PARCEL METHOD OF ASSESSIV�NT ASSE;SSMEIVT DISIRICTS NO. NO. ASSESS117IIVT � UNI'TS OR FEE Iatecomer A eement( vt)WATER -O- I.atecomer A reement( vt)WASTEWATER -O- � Latecomer A eement( vt)O'THER -p- S ' Assessment District/WATER -p- S ial Assessment DistricUWASi'EWATER -O- Joiat Use A reement(METRO) - - Local Im rovement District s — Traffic BeneCt Zones 575.00 PER TRIP CAI.CUI.ATED BY TRANSPORTATION � FT.TPURE OBLIGATIONS -' SYSTEM DEVELOPII�NT CAARGE-WATER ' Fstimated �OF UNTTS/ SDC FEE " Pd Prev. ' Partiall Pd(L.td Exem tion) " Never Pd S .FTG. S' famil residential 51,5251unit x �.¢,5�7�.00 Mobile home dwdlin unit$1220/unit in ark A artment,Condo S915/unit not in CD or COR zones x � CommerciaUIndustriat, 50.213/sq.ft.of ro rty(not less than S1,525.00)z Boeir►a,by Special AgreementfFootprint of B{dg plas 15 h perimet�r(2,800 GPM threshold) SYStEM DEVELOPMENT CHARGE-WASTEWATER' Fstimated . ' Pd Prev. - Partiall Pd(Ltd Exem tion) ' Never Pd Sia le famil residential S900/unit x 2 ?OO• Mobile home dwellin unit 5720/unit x -- - A artment,Condo$540lunit not in CD or COR zones x CommerciaUIndustrial 50.126/ .ft.o[ ro rt z(not less than S900:00) -- SYSTEM DEVELOPMENT CHARGE-SURFACEWATER ' Fstunated " Pd Prev. ' Partiall Pd(Ltd Ezem tion) ' Never Pd Sin le iamil residential and mobite home dwellin unit s7151unit z 3 2�14'r...�'. All other properties 50.249/sq ft of new impervious area ot property x (not less than S'715.00). - PRELIMINARY TOTAL S q 4?rQ00 � N a � M O_ Signature Revi ing Authority DATE �' n O �� *If subject property is�vithin an LID,it is developers�esponsibility to check wiih the Finance Dept. for paid/un-paid status. µ �� Square footage fgures are taken from the King County Assessor's map and are subject to change. E • " Current City SDC fee charges apply to 0 EFFECT[VE January 1, 200� � — SECTION 3 � � � OFFSITE ANALYSIS � � . I��'M� �cX..� �7`2�..� S- ��.. Pro'ect Overview �rf�`��� ���� � ���.�,.�-� Cl�'SSr��' J � %, IS� This project involves the development of a 0.69-acre parcel into four single-family lots. The site is located at 1424 North 40�' Street, at the northwest corner of North 40"' Street and Meadow Avenue North,. The site has a single residence and garage that will be removed. The reminder of the site is covered with lawn with large trees. �' The site slopes down to the north-northwest at about 2%to 25%. Upstream Drainage There is little if any upstream runoff onto the site. There are no apparent problems associated with any upstream runoff. Level 1 Downstream Drainage Analysis Runoff from the site shaet flows north-northeast from the site onto the adjacent parcel(A). This flow continues north-northeast about 250' down the adjacent 2S%f slope to May Creek(B). May Creek continues northwest another 900' where it �� crosses Lake Washington Boulevazd and the adjacent railroad track under a bridge ' (C), flowing southwest onto the Barbee Mill pmperiy(D). At about 4/�o mile downstream of the site, May Creek dischazges into Lake Washington(E). There aze no apparent downstream problems. I �: _ _--------- _:_-___.--_ ------�..,__�_ , _ - ' ' / Proposed Drainage Controls � ' Because there will be greater than a 0.1-cfs increase in the 100-year runo� flow ' control is required. An infiltration tank sized to control the 100-year storm event will � provide the required flow control. Also beca.use will be no more than 4,000 sq-ft of i new impervious surfaces subject to vehicular, water quality controLs are not required. I ' �}�c� �r �" -�rv ;�,.._ �+-��- .� I� �.- � � � Q ,�\ :,` `a l/ \ - - _, - �q `�` ��="`---- -------------� '';-"��=i-''''��--=____ SECTION 4 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN I - � � . \ . \ �� �/by � '6 p� 1 1�RY 1�pr 1 1>2 �� �._ �R . .r�: . !� .i� 2,_ A • ��:' N . � , �.� ,� � • ,� � 4 •cEnut, �j"'` � � 'CFD 1 YFl� . ;�` �'� � �Z , s-Fla=,._ ' .,,gcy o�� O(/�� ,� 3 i2� _ tcEro aT(i�, o�_ o � , -, �'F �._. �i ��� �� s- n o'►a�Ft[ t2�'tire F �V t z'cEo� y 10" '� � ---j c� » ! I � � ��,�' . 6� 16 '� r'� r ��/ y 1 AlOER � � � �O J 18�.. A21T,FK ,` p �'� �� O v\J� Z Gt � ^16— .� � � a - , ;e'Ftrt S �� � ;� k,. � SHED . � � 4'Flff^ � � � BU0.DING _i �� �� , 4 'i � �� , ��� � 14 i ..',.'�i7.,` O �' U �/ a ������ /`� 2o'�t HOUSE � CON � . Iz ��l+. ts'c�Dut FF=119. e� CARP 7 � �yo� w �- U � O W . O �� < 3 CATCH BASIN oo ��� �pNCRETE c� w Nt ro RIM=117.93 ��HANG f INV=115.63,12�AD5 S � �'� o ((�tAy� �, .,�t t° 160.10' � „ � S 89'30'44' E � 38'C£DAR � 3'WOOD FEN ' a" cv . 1 . 28-' -, 24 ���—�– } � EDGE OF ASPHAI _ °F'–' _ = 7---------�s � — — OF ASPHALT � �:���.� � N 40TH ST. _� ; ST012M MANHOLE CATCH'BASIN StORM MANHOIE z► RIM=122.91 RIM�118.69 RIM=118.66 INV=117.91,18"ADS S iNV=114.44,8"CONC E INV=115.66,8"CONC W INV=117.91,18�ADS W INV=113.39,18�CONC E � f f' INV=113.39,12'CONC W 5 INV=113.59,12'ADS N � ' Q � �T Existing Condit�ons 1�� = so� ' .\ � �,�M�PNO , '� \� ` QQ�O�S��.�. .6 6�9! O� � �a ��'�0 50� BUFFER -�o 1� ��2 � 4' � 1' � O /i b i 1 i 'i0 - DAR C 16 /��� � �g� QO � �1 h / -—'-� ^ �9� i� + 6/ / �� } a�0 % �90 N 4 /��/ 'CEDAR fIR� . �. `pp, / 12 FI � � i " �? � e•F�R, �aGyU,oti '� 12�FlR� \ �'� �— �9� I 0"IAAPI -6'CEDA ��� I � -��\ � O6—_ 72�FtR �� '1 , 2'C DAR �O�CEDAR 100-- 2-1k9ER-- _ 11� 6�FIR ��102 V� -- _ 6"AP• 3 17 2— "���Y � �� ._-i ,� 114— Z �8� _�_2� R ss' �v�� �ss/��n� �'� , . � „6- 2 "".l �'.`- �/18�FIR k :�;, `__ SHE /��_ $.. ` tre_ * �iFF.�'�\ �.'1 16�FIR 2 ' � 6' ,,� . ,'� B ILDING � ;� �; , � � ~' ,� HWSE a /" � �O�FIR FF�118.5 � � pRT U �R �.iC7� � � . � 28' DAR Z -.,:' �` � � —,,,� .�' I < � ca+� �• o� -� f,� m °e'�rrt cRAVEt o � --�_ �v -_" J I S' I ? 6 I �� 36"CEDAR 3�W00� FQd.CE 2 �.4 ,+ 1 s --- =�.��. «— � �-8 FWND IAON OF ASPHALT �p(,E CATqi BASIN � �� ��H� 6.13 RIM�117.93 �`� �TM ST� RIM=122_81 �C E INV=115.63,12�ADS S = INV=109.61,8"CONC S C W I INV=109.56.8'CONC N STORM MANHOLE STORfA MANHOIE RIIA=118.69 RIM=122.91 INV=114.44.B�CONC E INV=117.91,18`ADS S INV=113.39.18'CONC E CATCH BASIN INV=117.91.18'ADS W INV=113.39.18"CONC RIM=118.66 Z INV-113.59.12'ADS N INV=115.66.8�CONC W ����A� I � LOCATION OF EpST1NG 12"WATER ¢ i Z � N Developed Conditions � 1�� = so� �B ��3 -oZo BAIMA & HOLMBERG, INC. 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'.__. : ,. � ` '. � __.. .. ._.. __...__ _._...._ .._._.... _... ___ _ ..-:.. .. � � _ _ __ ��4-T��- , l�� � + : _ Q . _ _ :_ F _ __ _ . , : _ ____ _ _ . _ . ___ _ _ _ _ _ _ _ , __ _ . . __ . __ s :. � _ _.. :_ �p������. y� 2��s t�-ru�� - I � , . ; _:__ . ___ : __ _. __ . _ _ . . __ _ , :_ : : , t, , _ __ ......... :. : ¢. � �Z.D �_20 ,�_ _ � ,��G�S� _ ; _ : _ ; : _ w�� � _ , .....�...... :. � f � _ �yu ��� .. : .:......_:_..._.: . : : _ : _. ,_ ._ ; .. . � G�J f�.Lu1�-�:f�b�.lZ 1.07 : ; ' ; ' , , _. , , . . � _ . �..... . ; _ . . _ . __ _ _._ - � _... : : ` . . . . i . . �OQ�� �. ���os� . � _ _. _ : : � -- _ . _ : � . _ _ : . . . __ : ; : : � : . . : � .� - Wt4�1't�'i�,_ �,1�14G c.� : : ; . _: ._ _._.. _. _ __ ' _;... ..:... .._:.. ;_ __�129 � . �� �� : _:. ���-,����„�� Existing Conditions KCRTS Peaks Flow Frequency Analysis Time Series File: 1673u.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) {CFS) Period 0.049 3 2/09/O1 2:00 0.091 1 100.00 0.990 0.024 8 1/05/02 16:00 0.057 2 25.00 0. 960 0.057 2 2/27/03 7:00 0.044 3 10.00 0. 900 0.027 7 8/26/09 2:00 0.040 4 5.00 0.800 0.033 5 10/28/09 16:00 0.033 5 3.00 0. 667 0.030 6 1/18/06 16:00 0.030 6 2.00 0.500 • 0.090 4 10/26/06 0:00 0.027 7 1.30 0.231 0.091 1 1/09/08 6:00 0.024 8 1. 10 0.091 Computed Peaks 0.080 50.00 0. 980 Developed Conditions RCRTS Peaks Flow Frequency Analysis Time Series File:1673d.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.107 5 2/09/O1 2:00 0.211 1 '100.00 0. 990 0.088 8 1/05/02 16:00 0.149 2 25.00 0.960 0.129 3 2/27/03 7:00 0.129 3 10.00 0.900 0. 102 7 8/26/09 2:00 0.121 4 5.00 0.800 0.121 4 10/28/04 16:00 0.107 5 3.00 0.667 0.107 6 1/18/06 16:00 0.107 6 2.00 0.500 0. 149 2 10/26/06 0:40 0.102 7 1.30 0.231 0.211 1 1/09/08 6:00 0.088 8 1.10 0.091 Computed Peaks 0.190 50.00 0.980 � 100-yr Desiga - 96" Diameter Infiltration Taak Retention/Detention Facility Type of Facility: Infiltration Tank Tank Diameter: 8.00 ft Trench Width: 16.00 ft Tank Length: 47. ft Effective Storage Depth: 8.00 ft Stage 0 Elevation: 0.00 ft Storaqe Volume: 3438. cu. ft Vertical Periaeability: 33.40 mia/in Permeable Surfaces: Bottom Riser Head: 8.00 ft Riser Diameter: 8.00 inches Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation (ft) (ft) (cu. ft) (ac-ft) (cfs) (cfs) 0.00 0.00 0. 0.000 0.000 0.00 0.04 0.04 10. 0.000 0.000 0.03 0.15 0.15 41. 0.001 0.000 0.03 0.26 0.26 75. 0.002 0.000 0.03 0.36 0.36 107. 0.002 0.000 0.03 0.47 0.47 194. 0.003 0.000 0.03 0.58 0.58 183. 0.004 0.000 0.03 � 0.68 0.68 220. 0.005 0.000 0.03 0.79 0.79 261. 0.006 0.000 0.03 0.90 0.90 304. 0.007 0.000 0.03 1.00 1.00 343. 0.008 0.000 0.03 1.11 1.11 387. 0.009 0.000 0.03 1.22 1.22 432. 0.010 0.000 0.03 1.32 1.32 474. 0.011 0.000 0.03 1.43 1.43 520. 0.012 0.000 0.03 1.54 1.54 567. 0.013 0.000 0.03 1.64 1.64 610. 0.014 0.000 0.03 1.75 1.75 659. 0.015 0.000 0.03 1.86 1.86 707. 0.016 0.000 0.03 1.96 1.96 752. 0.017 0.000 0.03 2.07 2.07 802. 0.018 0.000 0.03 2.18 2.18 852. 0.020 0.000 0.03 2.28 2.28 898. 0.021 0.000 0.03 2.39 2.39 949. 0.022 0.000 0.03 2.49 2.49 995. 0.023 0.000 0.03 ' 2.60 2.60 1047. 0.024 0.000 Q.03 2.71 2.71 1098. 0.025 0.000 a.03 2.81 2.81 1146. 0.026 0.000 0.03 2.92 2.92 1198. 0.027 0,000 0.03 3.03 3.03 1250. 0.029 0.000 0.03 3.13 3.13 1298. 0.030 0.000 0.03 3.24 3.24 1351. 0.031 0.000 0.03 3.35 3.35 1404. 0.032 �.000 0.03 3.45 3.45 1452. 0.033 0.000 0.03 EO'0 066'T 5L0'0 '8£b� 06'6 0�'6 EO'0 OZ6'T 6L0'0 '8£b� 0£'6 0£'6 �0'0 068'T 6L0'0 '8£b� OZ'6 OZ'6 EO'0 09L'Z 6L0'0 '8��£ OI'6 OT'6 £0'0 089'i 6L0'0 '8�6£ 00'6 00'6 �0'0 06S't 6L0'0 '8Eb� 06'8 06"8 �0'0 OOS'T 6L0'0 '8£b� 08'8 08'8 EO'0 OI�'T 6L0'0 '8£6� OL'8 OL'8 £0'0 00�'T 6L0'0 '8£bE 09'8 09'8 �0'0 06T'Z 6L0'0 '8€b� OS'8 OS'S �0'0 090'Z 6L0'0 '8��E O6'8 Ob'8 £0'0 TZ6'0 6L0'0 "8£6� OE'8 0£"8 £0'0 T8S'0 6L0'0 '8�6£ OZ'8 OZ'8 EO'0 SOZ'0 6L0'0 '8�6� OT'8 OT'8 EO'0 000'0 6L0'0 '8£6£ 00'8 00'8 €0'0 000'0 6L0'0 'OZ6£ £6'L £6'L £0"0 000'0 8L0'0 'Z6££ £8'L �8'L £0'0 000'0 LLO'0 'LS�� ZL'L ZL'L £0'0 000'0 9L0'0 'TZ�£ 19'L i9'L £0'0 000'0 SLO'0 'L8Z£ i5'L TS'L �0'0 Od0'0 SLO'0 '8�Z£ 06'L 06'L EO'0 000'0 6L0'0 'LOZE 6Z'L 6Z'L £0"0 000'0 £LO'0 "OLi� 6Z'L 6i'L £0'0 000'0 ZLO'0 'LZZ£ 80'L 80'L £0'0 000'0 iL0'0 '�80£ L6'9 L6'9 �0'0 000'0 OLO'0 '£�0£ L8'9 L8'9 £0'0 000'0 690'0 '866Z 9L'9 9L'9 �0'0 000'0 890'0 'ZS6Z S9'9 S9'9 £0'0 000'0 L90'0 'OT6Z SS'9 SS'9 £0'0 000'0 990'0 '£98Z ��'9 �6'9 £0'0 000'0 S90'0 'Si8Z ££'9 ££'9 £0'0 000'0 690'0 'TLLZ �Z'9 £Z'9 £0'0 000'0 Z90'0 'ZZLZ ZT'9 ZT'9 £0'0 000'0 T90'0 '£L9Z 10'9 TO'9 £0'0 000'0 090'0 '8Z9Z T6'S I6'S £0'0 000'0 6S0'0 "LLSZ 08'S 08'S �0'0 000'0 8S0'0 'LZSZ 69'S 69'S £0'0 000'0 LSO'0 "T8�Z 6S'S 6S'S £0'0 000'0 9S0'� '6Z�Z 8�'S 86'S £0'0 000'0 SSO'0 'SL£Z L£'S L£'S �0'0 OQO'0 6S0'0 'T��Z LZ'S LZ'S £0'0 000'0 ZSO'0 '6LZZ 9T'S 9T'S £0'0 0�0'0 TSO'0 '9ZZZ SO'S SO'S �0'0 000'0 OSO'0 '6LtiZ Sfi '� S6'6 �0'0 000'0 660'0 '9ZZZ �8'b 68'b �0"0 000'0 860'0 '£LOZ £L'� £L"6 � £0'0 000'0 9�0'0 'SZOZ £9'� �9'6 I £0'0 000'0 S�0'0 'ZL6t ZS'6 ZS'4 �� £0'0 000'0 6�0'0 '815T Tb'6 16'b ' �0'0 000'0 ��0'0 'QL$T Z�'� TE'6 I �0'0 000'0 Zb0'0 '9T8i OZ'6 OZ'� '' £0'0 000'0 060'0 '£9LT 60'� 60'6 �0'0 000'0 6£0'0 'bTLt 66'£ 66'E EO'0 000'0 8E0'0 'T99T 88'£ 88'£ �0'0 Q00'0 L£0'0 'L09t LL'E LL'£ �0'0 000'0 9£0'0 '6SSt L9'£ L9'£ �0'0 000'0 S£0'0 '90St 9S'£ 9S'£ 9.50 9.50 3438 . 0.079 2.060 0.03 9.60 9.60 3438. 0.079 2.130 0.03 9.70 9.70 3438. 0.079 2.190 0.03 9.80 9.80 3438. 0.079 2.260 0.03 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu-Ft) (Ac-Ft) 1 0.21 0.00 0.00 8.00 8.00 3438. 0.079 100-yr 2 0.11 0.00 0.00 6.06 6.06 2694. 0.062 3 0.15 0.00 0.00 5.37 5.37 2379. 0.055 4 0.11 0.00 0.00 5.05 5.05 2226. 0.051 5 0.13 0.00 0.00 3.76 3.76 1604. 0.037 6 0.12 0.00 0.00 2.63 2.63 1059. 0.024 7 0.10 0.00 0.00 1.52 1.52 557. 0.013 8 0.09 0.00 0.00 1.29 1.29 460. 0.011 I � I SECTION 5 � CONVEYANCE SYSTEM ANALYSIS AND DESIGN '�� SECTION 6 SPECIAL REPORTS AND STUDIES I /� �.� -��o Dennis Joule, P.E. Civil Engineer 31700 S.E. 4 Street Consultant in Fall City, Washington 98024 Geotechrrical Engineering Phone/F.4X(425)222-4661 Joule4 a(��40L.COM Joe Pruss 18211 240th Avenue SB. Maple Valley, Washington 98038 June 16, 2005 Project 1880 Re: Kennydale Crrove Short Plat—Storm Water Infiltration System At the request of the project engineer, Baima-Holmberg, Inc., I have reviewed the Baima- Holmberg plans titled Kennydale Grove Short Plat Topography, Water, Sewer, Storm, & Tree Plan, dated 12-14-2004. I have also reviewed my geotechnical engineering report for this project dated December 13, 1004. The infiltration facility for the storm water system is to be located in the north corner of the property near the base of the slope,just outside of the approved limits of the offsite wetland. In this area the permeable soil extends to over eleven feet deep, allowing both lateral and vertical water dispersion. No development is planned downslope from facility because of the � offsite wetland. ' Based on my review of the information listed above it is my opinion that the location of the infiltration facility for the storm water system is acceptable, and should not adversely impact ' the project as planned. Very truly, ����•1tS p�� ��Q�Ci�Of YI ASf���,c��`^3 �' y a y ' � =' 4 � 'c � � I `���t� ��GlST£R����� �`��_oNAL 6��/11 Dennis Joule,P.E. E��-9-0� Ceatechnical Engineering Report Joe Pruss Preliminary Subdivision 1424 Nortli 40`h Street Renton, Washington December 13, 2004 f Prepared For: Joe Pruss 18211 240th Avenue S.E. Maple Valley, Washington 98038 Prepared By: � Dennis Joule, P.E. 31700 S.E. 46th Street Fall City, Washington 98024 � Consultant In Geotechnical Engineering GEOTECHNICAL ENGtNEERING REPORT Joe Pruss Preliminary Subdivision At 1424 North 40ib Street ; Renton, Washington December 13, 2004 I INTRODUCTION I The project site, located at 1424 North 40"' Street, is about 0.7 acres in area and approximately � rectangular in plan. The lanned develo ment consists of subdividin the ro ert into four sin le-famil residential P P g P P Y g Y lots, with associated access and utilities. INFORMATION PROVIDED i A site plan, showing the site location, dimensions, topography, existing structures, and proposed � lot layout was provided by Baima-Holmberg, Inc., Civil Engineers of Issaquah. ' This information was used in preparing the drawing on the opposite page, which also shows the locations of the backhoe test pits. SCOPE The scope of work in this investigation included the following: l. Subsurface exploration by means of five backhoe test pits, 2. Engineering evaluation and analysis of field data and published documents for the purpose of providing recommendations regarding the geotechnical aspects of site development, and 3. Preparation of this report in accordance with Chapter 18 of the U.B.C., presenting the findings and recommendations. Page 1 Project 1880 December 13, 2004 FINDINGS Surface Conditions The property has a overall average slope of about twenty percent toward the north. Near the street the slope is generally less than five percent, north of that the ground steepens to from twenty to twenty five percent. At the time of the field investigation there was an existing residence with detached carport and outbuilding. The remainder of the ground was landscaped including, fir, cedar and fruit trees, shrubs, and lawn. No flowing water, standing water, or wet ground was observed within the site. �I Geology The site is mapped as recessional outwash (USDA-SCS, 1973). As the Vashon glacier receded, large quantities of ineltwater were discharged from it. The meltwater sorted material in its path and left very gravelly and sandy sediments that range in thickness from four to over one hundred � feet on the upland terraces. Indianola soils formed in the sandy recessional deposits. I Subsurface Conditions ' The site is mapped by the U.S. Soil Conservation Service as Indianola sandy loam (InC), ground slopes four to fifteen percent. Within the twelve foot maximum depth of exploration, the site is underlain by clean to silty, medium dense sand. No ground water, wet soil, or soil color mottling was encountered in the test pits. Test pit logs are appended. CONCLUSIONS Seismic Considerations As with all land in the Puget Sound region, this property lies in Seismic Zone 3. Page 2 Project 1880 December 13, 2004 Seismic hazards can be divided into two general categories, hazards due to ground rupture and hazards due to ground shaking. Since no faults are known to pass through the site, the possibility of earthquake induced ground rupture appears to be remote. Even if severe ground shaking were to occur at the site, the medium dense clean to silty sands � encountered in the exploration will not liquefy because they are not saturated and do not have � the characteristics of materials prone to liquefaction under dynamic loads. The sands encountered are too dense, and their hydraulic conductivity allows dissipation of excessive pour pressure. The silts layers are too compact, and can rely on the cohesive component of their shear strength. Compressible Soils No compressible soils were encountered. Slope Stability The slopes were field mapped and no evidence of instability was observed. The slopes have certainly been subject to seismic activity in the past, therefore, the present stability of the slopes provides some evidence of future stability. � The slopes have a total height of about fifty feet high and consist of inedium dense, well drained, Sand. Construction within Lots 1 and 2 will be on nearly level ground. Lots 3 and 4 have ground slopes of between twenty and twenty two percent in the anticipated building areas. Groundwater The test pits were logged following and during a period of heavy early wet season rainfall. No standing water or wet soil was observed in the test pits. No soil characteristics (such as color imottling) were observed to indicate the presence of a seasonal groundwater within the upper twelve feet of soil. RECOMMENDATIONS Existing Buildings ' The existing buildings on the site are to be razed. All demolition debris, including buried utilities, tanks, and foundations should be removed from the site. i , Page 3 Project 1880 December 13, 2004 Site Preparation Depressions and loose soil zones resulting from the removal of the buildings, trees, large shrubs, or underground structures should be carefully backfilled with thoroughly compacted on- site inorganic soil or approved import soil. The surface of the site within the proposed building and pavement areas should be stripped to remove vegetation and organic topsoil. Soil containing more than two percent by weight organic matter should be considered organic. Stripping depths should be decided in the field at the tune of construction but for planning purposes an average stripping depth of three to four inches may be assumed. Strippings may be stockpiled for subsequent use in landscaped areas. Erosion Sensitivity of the On-Site Soils Site soils are cohesionless and very prone to erosion. Exposed sloping ground should immediately be covered with visqueen. Water from the visqueen-covered areas must be directed into a temporary or permanent drainage facility. Spare straw bales should be stored and available on-site to repair isolated areas of erosion if they occur, and control surface drainage if needed. Excavation and Slopes Temporary cut banks should never be steeper than 1.5:1 (horizontal to vertical). The cohesionless sands will not stand safely at less than 1.5:1. Permanent cut or fill banks should not exceed slopes of 2:1. All exposed slopes should immediately be covered with visqueen. The visqueen should remain until they can be landscaped. Soil stockpiles should be covered with visqueen to prevent saturation and erosion. Grading and Compaction If any import fill is required it should be inorganic, of low expansion potential, and should contain no rocks or lumps larger than 4 inches in greatest dimension. Stripped soil surfaces in those areas to receive structural fill, foundations, slabs-on-grade, or pavements, should be scarified to a depth of at least six inches. The soil should be moisture conditioned (or allowed to dry) to produce a moisture content of two percent above the optimum value and then compacted to a density equivalent to at least 90 percent of the maximum value as determined by ASTM , Test D1557-70. (U.B.C. Standard 70-1: Field-tests by U.B.C. Standards 70-2, 70-3, 70-4, or 70-5). Page 4 Project 1880 December 13, 2004 Structural fill using on-site or import inorganic soil should be placed in layers not exceeding eight inches in loose thickness, conditioned with water (or allowed to dry) and compacted to the requirements described previously. Where the fill is to be placed on slopes exceeding ten percent the stripped ground is to benched prior to fill placement. Level benches are to be cut into the hillside at least five feet wide. Fill is to be placed in horizontal lifts. Utility Trenches ( Utility trench excavation can be performed with conventional mechanical equipment to depths up to twelve feet. Excavations up to twelve feet should not encounter groundwater. Trench excavations will not safely stand vertical, but will slough to the natural angle of repose of seventy percent (about 1.5:1). For the purposes of this section of the report, backfill is material placed in a trench starting one foot above the pipe or conduit or at the top of concrete formed around the pipe or conduit; and bedding is all material placed in a trench below the backf'ill. Unless concrete bedding is required around utility pipe or conduits, free draining sand should be used as bedding. Sand bedding should be compacted by mechanical means to a density equivalent to at least 95 percent of the compaction test maximum (ASTM D1557-70). Trench backf'ill should be placed in horizontal layers not exceeding six inches in loose thickness and compacted by mechanical means at least 90 percent of the compaction test maximum (ASTM D1557-70). Retaining Walls Retaining walls constructed as part of the foundation system cannot be allowed to "rotate", developing "active" soil pressures. Therefore an "at rest" lateral soil coefficient of 0.5 should be used. Retaining walls may be designed using the equivalent fluid pressure method. For non- compacted granular soil an average backfill soil unit weight of 100-1b/cu ft may be assumed (lateral pressure would then be 50-1b/cu ft). The lateral coefficient of sliding between the concrete base and the underlying sandy soil may be designed at 0.25. Passive soil pressures will depend on the embedment depth and proximity to adjacent slopes below. Rockeries Rockeries are not earth retaining structures. Rockeries may be used as slough wall against , stable earth cuts only. It is recommended that rockeries not be constructed over four feet high within this site. Rockery construction must comply with the City Renton standards. Page S Project 1880 December 13, 2004 Embedded Post or Columns _ When designing posts or poles as embedded columns in accordance with U.B.C. Section 1806.8.2.1, lateral bearing (S1 or S3) may be taken at 1201b/ftz/ft depth below ground surface. Building Foundations When determining minimum earthquake forces for structures in accordance with U.B.C. Section 1629.1, consider the site to be underlain by soil Profile Type SD. The proposed framed single-family residential buildings may be supported on conventional shallow foundations bearing on firm natural soil or compacted structural fill. Reinforced concrete continuous footings may be designed to impose pressures on foundation soils up to 1500 pounds per square foot from dead plus normal live loading provided the resulting foundation width is not less than 12 inches for one story, 15 inches for two story, and 18 inches for three story portions of the structure. Individual reinforced concrete foundations, such as may be used for supporting columns, may also be designed to impose pressures of up to 1500 pounds per square foot from dead plus normal live loading, but should be at least 24 inches in minimal plan dimension. As a minimum, isolated concrete pads shall have two #4 bars. These bars shall form a cross (as seen in plan view), and shall be set mid depth in the concrete. Within Lots 3 and 4, no individual piers should be used. Interior loads should be supported on interior reinforced continuous footings. These footings should be connected to the exterior footings and the reinforcing steel lapped onto the reinforcing steel from the exterior footings. The perimeter footing should extend under the garage door. Where footings are constructed adjacent to downslope cut banks or slopes, there is to be a minimum 2:1 slope drawn between the bottom of the footing (point nearest the slope) and the toe of the cut bank or slope. Foundations should be embedded at least twelve inches below pad grade or adjacent finished grade, whichever is lower. Total Differential Settlement No compressible soils were encountered in the test pits. Soils are uniform in compactness and thickness within each building pad. Therefore, the total differential settlement for buildings designed and constructed in accordance with the recommendations presented in this report should be negligible. Settlement should occur during the initial framing period. ' Page 6 Project 1880 December 13, 2004 Concrete Slabs-On-Grade Concrete floor slab should be constructed on compact soil subgrades prepared as described in the sections under Grading and Compaction. Where floor dampness must be minimized, a minimum 4-inch section of capillary break material covered with a membrane vapor barrier should be placed between the floor slab and the compact soil subgrade. The capillary break should be free draining, clean gravel or rock, such as 3/8" pea gravel. The membrane vapor barrier should be at least 10-mil thick polyethylene or its equivalent. Where floor dampness is not objectionable, concrete slabs may be laid directly on the compact soil subgrade. Footing and Retaining Wall Drains Footing drains are recommended for all footings and retaining walls. A perforated drainpipe should be placed at the upslope base of the footing. The drainpipe should be covered with at least a twelve-inch wide zone of washed 1/2" to 1" drainrock. The drainrock layer should be about twelve inches thick for footings and should extend at least half way up the back of retaining walls. The drainrock should be covered with filter fabric paper, and a layer of native soil should be placed over filter fabric as a soil cap. I Preliminary Soil Infiltration Data With respect to infiltration, the site is underlain by fine to medium grained sand. No groundwater is anticipated within the upper twelve feet. While no infiltration tests were performed, a preliminary estimate is that the sandy site soils have percolation rates in the range of two to four minutes per inch (2-4 Min./in.). Using the conservative end of the range, this is an infiltration rate of 0.25 Inches Per Minute. For preliminary calculations using equation 5-9 in Section 5.4.1 of the King County Surface Water Design Manual: I ����a = 0.25 In/Min =15 In/Hr F �s�;,� = 0.30 (EPA Method of testing would likely be used) F P���s�g = 0.8 (fine sands and loamy sands) D = 12' Once specific infiltration areas are selected, infiltrations tests should be performed to determine final design values. i � �� i i Page 7 _ Project 1880 I � December 13, 2004 ', Surface Drainage and Landscaping Surface drainage gradients should be planned to prevent ponding and to direct surface water away from the buildings, slabs, edges of pavements, and towards approved collection and discharge facilities. Drainage pipe should be provided to catch and dispose of downspout rainwater, discharge should be into the approved discharge facility. Site soils are very prone to erosion. Grading and landscaping plans must consider this soil condition. Landscaped ground should slope down away from building foundations at a minimum j two percent slope for at least five feet from the footings. Drainage should not be discharged on or near the top of the slopes. LIMITATIONS � i Changes in development plans will render these specific recommendations invalid unless this office reviews such changes and these recommendations modified accordingly. � � Subsurface exploration of any site is necessarily confined to selected locations, and conditions may and often do vary between these locations. Should varied conditions come to light during project development these conditions should be reported to this office for evaluation. � I PLAN REVIEW AT BUILDING PERMIT STAGE � It is recommended that the Site Plans and Building Plans for the development of Lots 3 and 4 be reviewed by a licensed (P.E.) geotechnical (Civil) engineer at the building permit stage of development. Additional exploration may be appropriate. Report Prepared By: � ,��l�iiiiy�i ���E��,�S �I��-�r. ����Ci�pF YJ�tS y�yc���3 , � � _ 'a 2 � t � • - �� ` � � �O� ,p is��s �o �v� � �D,o FGtSTf�� ���' !� �`�,���NAL ���1��� Dennis Joule, P.E. EXPIRES 7-9-05 Page 8 I Appendix A '; Arial Vicinity Map and Topography i � � � � �-�' , � ,, � !— - . i � � � -�---r.��.Y�. ra�e i or i O King County ��� . - .. � 1424 North 40th Street, Renton WA � � � �t� f�.i p 't� �T ��=�� � �� r � , 3i =� � � � f �: l ; � f � ? ' �i�: > j � �L � i,�. j�.{ritiGriSS . i '1 ti a �[. -L � � t i t-_ � a:. �J � �E� `v �, 32?i'J�4_�i'� �!F' � � � ���. � '"►�`�, ��.�� �#� ' 3?raa54�a5 � �j� �" � ,�-�� �{ � j "�\� � ��, ���` .� ar��� ;• Ka .^- - �� t: �� � Sr ,a� - - �'��" ��y. 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' g Camly makes no rep�esenta6ons or warran6es,express or implied,as to accuracy,oompleteness,timeliness,or rights to the use of such nfortnation.King Counly shafl not be liabte for any ye�e�al,special,indirect,incideMal,or conseque�tial damages induding,but not limited to, st revenues or bst profits resufting from the use or misuse of ihe information contained o�this map.Arry sale of this map or iniortnation on is ma is rohibited ex b written rtnission of Kin Coun . Kin Coun��GIS Center�News�Services�Comments�Search By visiting this and ofher King County web pages,you expressy agree to be bound by temis and conditio�s of the ske.The details, http://www5.metrokc.gov/servleUcom.esri.esrimap.Esrimap?ServiceName=overview&Cl... 12/12/2004 i _ . r _._ . . - .._b.. � ..< < i King County �� � . - � 1424 North 40th Street, Renton, WA � r f _. � ,. ' �� � �� --- s22�oss�� t '`� `. - f' SJ ;' - /,� ���� ,� _ `'�� srrso�srot4 `s22�osr�os ��I��_ .'f ~-�,�` � � - ;�_. ; r` r� r; l � / ' � f ~`''�:,� . r ` �,: _ � ��� v r 322t059C�9 :�' � �� f � � — � r�``- -.` �1 � �` '�--� �t l•r, ��� � ;` j ' � n��000000 � `'� .... �. fT_�� fr �. ���F . � 1 f f• / ' - C � . .�� .�-'�•1: . ,GyF � 327i9b90�S 37240594C.rt� f� � �322d�3540$Q ��-��_++ � �L� ��r• {f�� Q� � •�,,TG�� 3724a54934 � f � � � Q° . ��`� �`Q� 3224�54:N 1 � 327# 9Di3 ���.`�, f �� � 322i054:135 f r i322t659_+9#} � J�f �}``,��� ./+ �J � � � � � � i " � / ' 3MiJ54�t5 r��' � S�- f f?77�759467 t f / �t�59C46� ��,� f f r �� r �f �~ � — N•40TH,ST�"�� ¢ ' — - ���� ���\ ,. + �p `2TQ253� r t �' � � Z 33i2TOb53S�3�t27t)6535-33421��`39�33f??OQ53fi 33i?T�'33t2fOC�53Z�{�'I #3t2TQ�`47` Q �_ 1 : \� l � •33(2TOC�t2t� ?; � tt / Y�� , 33a��3-t2To�S? � 33s27yJ53� � 111 ��a� 33d2TQ05#2 3347T00530 � 3�i27Q�533 t � � f 133d27QL�5lS��ly��l� / f � l f � � 3342f00578 � '�25 �� 4 I�� /33d2T�f —33�(270052J' 33t7TtK?573 33J2TQL�52S 33{2)L�526 � 3342700ri� 3 �� '{Cj]�L]K.y C«■yr, 3312TU0514 33t27ad321 �___,_�33�2Tt�52T� � . , . � ,�", 1ft � e in(ortnation induded on tfiis map has been compiled by King CouMy staif fi�om a variety of sources and is subject to change without notice. CouMy makes no representations or warranties,express or imp6ed,as to acaxacy,oomplebeness,lirr�eliness,or rights to the use of such nformation.lGng County shaq not De iable tor any general,speciat,indired,incidet►tal,or conseque�tial damages induding,but not limited to, ost reverwes a bst profrts resulting irom the use or misuse of tl�e infomwl'an oontained on this map.My sale of this map or information on 's ma is ibited ez b written rtnission of Cou Kinq County�GIS Center�News�Services�Comments�Search By visiting this and other ICmg Counry web pages,you expressly agree to be bound by terms and co�ditions of the site.The details. http://www5.metrokc.gov/servledcom.esri.esrimap.Esrimap?ServiceName=overview&Cl... 12/12/2004 Appendix B Tesf Pit Logs � SOIL LOG - TEST PIT No. 1 PROJECT: Pruss Property—1424 N. 40th Street, Reszton, WA DATE: 12-10-04 EXCAVATED BY: Hatachi EX40UR Trackhoe HOLE ELEVATION: 116' DEPTH TO GROUNDWATER: INITIAL None FINAL -- LOGGED BY: DJ SOIL DESCRIPTION COLOR MOISTURE CONSISTENCY SOIL TYPE DEPTH !PENITR.. TORVANE Silty Fine to Medium Grained SAND Brown Moist Loose SPN ! � i -1- � Medium Dense -2- I. Very Silty Fine SAND Gray Damp Medium SPL ' Brown Dense -3- Slightly Silty Medium Grained SAND Gray Damp Medium SPN � ' � " Brown j Dense , -4- , I � � i -5- � � -6- -7 - I � -8- i �. -9 - i j I ; -10- � Bottom Hole 10' ' No Water -11- ' '� -12- II � i -13- � ; � -14- j � � ; -15- � i � -16- � � , � -17- � I ' j � -18- ! �- i I ; -19- � , , , I ! -20- � � i CONSISTENCY AND SOIL TYPE INDICATE SOIL CLASSIFICATION BASED ON THE SUGGESTED REVISIONS TO THE UNIFIED SOILS I CLASSIFICATION SYSTEM - PENITR.INDICATES READINGS TAKEN WITH A SOILTEST POCKET PENITROMETER INSTRUMENT - TORVANE INDICATES READINGS TAKEN WITH A SOILTEST HAND TORVANE INSTRUMENT SOIL � AENNIS JOULE,P,E. CIVIL ENGINEER I I I - SOIL LQG - TEST PlT No. 2 PROJECT: Pruss Property—1424 N. 40�''Street, Renton, WA DATE: 12-10-04 EXCAVATED BY: Hatachi EX40UR Trackhoe HOLE ELEVATION: 90' DEPTH TO GROUNDWATER: INITIAL None FINAL -- LOGGED BY: DJ SOIL DESCRIPTION COLOR MOISTURE CONSISTENCY ; SOIL TYPE DEPTH PENITR.. TORVANE Slightly Silty Fine to Medium Grained SAND Gray Moist Loose ; SPN Brown � � � -1- ' � � Dense � ; Medium -2- ' � �I -3- � -4- I � � � -5- � -6- i I -7 - �� I � I j i -8- � I -9 - i -10- � -11- � Bottom Hole 11' � I No Water "12' i -13- , -14- -15- i i ' -16- ; �, ' i ; -17- � i � -18- I i -19- -20- I' � � � ' ' i � �� � CONSISTENCY AND 501L TYPE INDICATE SOIL CLASSIFICATION BASED ON THE SUGGESTED REVISIONS TO THE UNIFIED SOIIS CLASSIFICATION SYSTEM - PENITR.INDICATES REAOINGS TAKEN WITH A SOILTEST POCKET PENITROMETER INSTRUMENT - T�RVANE INDICATES READINGS TAKEN WITH A SOILTEST HAND TORVANE INSTRUMENT SOIL DENNIS JOULE, P,E. CIYIL ENGINEER I SQIL LOG - TEST PlT No. 3 PROJECT: Pruss Property—1424 N. 40`h Street, Renton, WA DATE: 12-10-04 EXCAVATED BY: Hatachi EX40UR Trackhoe HOLE ELEVATION: 110' DEPTH TO GROUNDWATER: INITIAL None FINAL -- LOGGED BY: DJ SOIL DESCRIPTION COLOR MOISTURE CONSISTENCY ' SOIL TYPE DEPTH PENITR.. TORVANE Slighdy Silty Fine to Medium Grained SAND Gray , Moist Loose ' SPN I Brown ----- -1- � Dense Medium -2- � I � -3- ; � ; ' -4- � -5- i i -6- � i -7 - I I _8_ ' I � -9 � -10- Bottom Hole 9.5' ' No Water -11- � -12- � � -13- � I �! � -14- � I -15- � ' -16- -17- i -18- i I � I -19- I ' I i ' � -20- � i j � CONSISTENCY AND SOIL TYPE INDICATE SOIL CLASSIFICATION BASED ON THE SUGGESTED REVISIONS TO THE UNIFIED SOILS CLASSIFICATION SYSTEM - PENITR.INDICATES READINGS TAKEN WITH A SOILTEST POCKET PENITROMETER INSTRUMENT - TORVANE INDICATES READINGS TAKEN WITH A SOILTEST HAND TORVANE INSTRUMENT SOIL DENNIS JUULE, P.E. CIVIL ENGlNEER SQIL LOG - TEST PIT No. 4 PROJECT: Pruss Property—1424 N. 40t"Street, Renton, WA DATE: 12-10-04 EXCAVATED BY: Hatachi EX40UR Trackhoe HOLE ELEVATION: 106' DEPTH TO GROUNDWATER: INITIAL None FINAL -- LOGGED BY: DJ SOII DESCRIPTION COLOR MOISTURE � CONSISTENCY ; SOIL TYPE DEPTH PENITR.. TORVANE Slightly Silty Fine to Medium Grained SAND Gray Moist � Loose II SPN ' Brown � -1- Dense -- I ; Medium -2- � � �, -3- I i ' -4- I -5- � � -6- -7 - -8- � � -9 - ; -10- � I -11- � i I -12- � ; I Bottom Hole 12' No Water -13- ;, � � -14- i i I i � -15- i � -16- �'�, ' , , � ' , � i � ' � -17- ; � I i I; -18- i , , ! ; � -19- ; i ' -20- � � i ; ': ' CONSISTENCY AND SOIL TYPE INDICATE SOIL CLASSIFICATION BASED ON THE SUGGESTED REVISIONS TO THE UNIFIED SOILS CLASSIFICATION SYSTEM - PENITR.INDICATES READINGS TAKEN WITH A SOILTEST POCKET PENITROMETER INSTRUMENT - TORVANE INDICATES READINGS TAKEN WITH A SOILTEST HAND TORVANE INSTRUMENT SOIL ' DENNIS JOULE, P.E. CIYIL ENGINEER SOIL LOG - TEST PIT No. 5 PROJECT: Pruss Property—1424 N. 40`h Street, Renton, WA DATE: 12-10-04 EXCAVATED BY: Hatachi EX40UR Trackhoe HOLE ELEVATION: 119' DEPTH TO GROUNDWATER: INITIAL None FINAL -- LOGGED BY: DJ SOIL OESCRIPTION COLOR � MOISTURE � CONSISTENCY I SOIL TYPE ' DEPTH �PENITR.. TORVANE 5/8 Crushed Rock Gra Moist ' Dense ' GPN � Very Silty Fine to Medium Grained SAND Gray Moist Medium SPL -1- Brown Dense I � � -2- � -3- � -4- Slightly Silty Fine to Medium Grained SAND Gray Damp Medium SPN i With Rounded Gravel (Clasts to 3") Brown Dense i -5- ! ; � � -6- -7 - I � � -8- ; � � i -9 - i � Bottom Hole 9' No Water � -10- � I � ; -11- � -12- -13- � � -14- � ; , i � -15- ; i � -16- � � � -17- ( � j -18- ', i J � � ; -19- ; ; � I -20- � CONSISTENCY AND SOIL TYPE INDICATE SOIL CLASSIFICATION BASED ON THE SUGGESTED REVISIONS TO THE UNIFIED SOILS CLASSIFICATION SYSTEM - PENITR.INDICATES READINGS TAKEN WITH A SOILTEST POCKET PENITROMETER INSTRUMENT - TORVANE INDICATES READINGS TAKEN WITH A SOILTEST HAND TORVANE INSTRUMENT SOIL DENNIS JOULE,P,E. CIV/L EIJGIIJEER , i � , � � � _ . . � � SECTION 7 OTHER PERMITS � I . . ; � ;_ I ' � � �� R � �. _ . . �f . , i SECTION 8 ESC ANALYSIS AND DESIGN , ; ; � �� , � ( � � � ��� _ 'I ; I _ � i , � ; � I � SECTION 9 I BOND QUANTITIES, FACILITY SUMMARIES, AND � - DECLARATION OF COVENANT , - -- - - - ..i-_ � . ' . . �-�"I . � . � - . (._._`. � � , .��� .�II� � . � � . SECTION 10 ' OPERATiONS AND MAINTENANCE MANUAL ,