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Home My WebLink About03771 - Technical Information Report - Drainage � N E 7t" North Phase 2 Short Plat � "� LUA14-000868, SH PL-A U 14005627 � �'� �-3?�� 3 518 N E 7t" Street Renton, Washington 98056 DRAINAGE REPORT July 1, 2014 (Updated October 27, 2014) (Updated December 4, 2014) (FINAL January 6, 2015) Prepared for: Scott Donogh Homes, Inc. Attn: Timothy Collins 2806 NE Sunset Blvd. Suite F Renton, Washington 98056 � �� (206) 612-8647 office � r � ar Prepared by: a1�1 � ,, Offe Engineers, PLLC � , �810I��,��b ' Darrell Offe, P.E. .��-� � 13932 SE 159�' Place j + f�� Renton, Washington 98058-7832 ` (425) 260-3412 office ' (425) 227-9460 fax da rre!I.affe@comcast.r�et 3 7 7/ i� ' � , %�� Table of Contents - • Technical Information Worksheet • Section 1: Project Ovenriew • Section 2: Conditions and Requirements Summary � Section 3: Offsite Analysis - � Section 4: Flow Control and Water Quality Facility Analysis and Design • Section 5: Conveyance System Analysis and Design • Section 6: Special Reports and Studies • Section 7: Other Permits ' • Section 8: CSWPPP Analysis and Design ( • Section 9: Bond Quantities, Facility Summaries, and Declaration of Co�enant • Section 10: Operations and Maintenance Manual , , -. 1 --� , ' ; �� i �� ;-, '�_� -� ( .� ;� r � �.. �- �� !iI - i �� City of Renton TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND Pa�t 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner: Scott Donogh Homes, Inc. Project Name: NE 7`h North Phase 2 Short Address: 2806 NE Sunset Blvd., Suite F P�at Renton,WA 98056 Phone: (206) 612-8647 Location Project Engineer: Darrell Offe, P.E. Township: 23 North Range: 5 East Company: Offe Engineers, PLLC Address/Phone: 13932 SE 159th Place Section: 5 Renton,WA 98058 425 260-3412 Part 3 TYPE OF PERMIT part 4 OTHER REVIEWS AND PERMITS APPLICATION Subdi�ision ❑ DFW HPA � Shoreline Management X Short Subdivision ❑ COE 404 Rockery ❑ Grading ❑ DOE Dam Safety Structural Vaults ❑ Commercial Other ❑ FEMA Floodplain � � Other ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community North Renton Drainage Basin Maplewood Creek/Cedar River/Lake Washington Part 6 SITE CHARACTERISTICS � River !' Floodplain � Seeps/Springs I- Stream � High Groundwater Table ❑ Critical Stream Reach � � Groundwater Recharge l� Depressions/Swales 'I Other ❑ Lake ❑ Steep Slopes Part 7 SOI LS Soil Type Slopes Erosion Potential Erosive Velocities Qgt 5—10% minor ❑ Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT ❑ Ch. 4—Downstream Analvsis "Limited Dispersion" ❑ ❑ ❑ � � �, J � Additional Sheets Attached Part 9 ESC REQUIREMENTS �I MINIMUM ESC REQWREMENTS MINIMUM ESC REQUIREMENTS �, DURING CONSTRUCTION AFTER CONSTRUCTION ' C Sedimentation Facilities Stabilize Exposed Surface �Stabilized Construction Entrance - Remove and Restore Temporary ESC Facilities �Perimeter Runoff Control IJ Clean and Remove All Silt and Debris Clearing and Grading Restrictions ❑ Ensure Operation of Permanent Facilities over Practices ❑ Flag Limits of SAO and open space Construction Sequence preservation areas ❑ Other ❑ Other Part 10 SURFACE WATER SYSTEM ^ Grass Lined Tank lnfiltration Method of Analysis Vault Channel � Depression 2009 City of Renton � Pipe System G Energy Dissipater Limited Infiltration KCRTS ❑ Wetland �+ Com ensation/Miti ati ❑ Open Channel P 9 '_, D Pond � Stream ❑ Waiver on of Eliminated Site ' rY Storage � ❑ Regional �'� Detention � i � Brief Description of System Operation: Catch basins within curb line of street will convey runoff to existing City system downstream, limited dispersion of houses, perforated , ; pipe connection to storm system,and sheet flow dispersion of driveways. I ; Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS Cast in Place Vault Drainage Easement ❑ Retaining Wall �� X Access Easement �i Rockery >4' High ❑ Structural on Steep Slope Tract ❑ Other ❑ Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision 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. + ��, �a 20/ I Signed/Date � Section 1: Project Overview � : � , The proposal is to create four individual single family lots from this 28,675 square foot parcel located in the Renton Highlands near the Renton Vocational College. The property address is: 3518 NE 7"' Street; King County Tax parcel #801110-0055. The existing residence, and impervious areas, and out buildings on the property will be removed to create these four new lots. The property slopes from the northeast corner to the - southwest corner. The properly is located within the"Peak Rate Flow Control Standard (Existing Site Conditions)"area of the drainage basin map. There are no sensitive areas on the project site. The property has a gentle slope of approximately 3°/o towards the southwest corner of the property. The soils on the site have been identified by a Geotechnical Engineers as"giacial consolidated till"{Qgt). These soils are not suitable for Full Infiltration of storm water runofF. The soil logs indicate moist silty sands with no ground water within the holes at 4'. The drainage calculations within this report will show that the developed runoff from the project is less than 0.10 cfs during a 100-year storm event between the existing runoff and the developed (mitigated) runoff. Based upon this review and ana�ysis, the project does not require stormwater treatment. The project dces not add 5,000 square feet of new impervious surface and therefore is except from water quality treatment. Reference 11-A � J = _ Flow Control Standards Peak Rate Flan Conttd Standard(bcistirg Site Condilions) '`e.:_�_:e�::�,, � .cbw Control Ouration Standard(Exisbng Sile Condtions) aE�2.�,J 5: 3 �M^_ ' ..-.Flaw Control Duration StandaM(Forested Conditions) � { ''� -Flood Problem Fbw i' j r W,` i' - , Unincapwated I(ing Counry Fbw Control Standards j ��"1 '� ��1 Renton Ciry Limds 1 �c � f . � L��PotentalMnexalionArea � � � �` � t.... . . . . .. . ._.. . _ .. . 1a •�� '� � _--- — T•._ — �.,•�.. .�.� � , ",, P• i`,9 � • • �`� 1 � a� '�, ,� Z = � � .:�� 4�0. 6 ! ��-. .._.._., - �� _�� : ��eB4�,5;: �� - �. ��e� ,. z y . � :.� �53 L� 1:`. F��.��:_ .. . - ,��cs a �..�.. . . �� _ � � _ �,�i � � � G - 1 ��tF��.��iG�=- _ y _ � � �, . a �'—'_'—'_--1 `` �.�:��: - .,,.i . a �*. ��"e�^� �.«.._._�.___^---` �� c � � _ � . �- � � � � _ .16i�. �i� ` �.. , .. 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U ry �;.�k .yi � Q ^.� ' , }� c � 3:... � 1`'';• � � .y~ � � � `� ' � L 't/d�l � � ' � •O �c`O�� "�� 'm"�� ^�'{�� . ' a �ti c�' �[D�ti+n d � "a . .. � ..P�� `� �•�� r t`� ��f `'� ��'� � .. l ._. � " I �� b d � n�n�, ��^� � f � ��, N i % � . .kX,` � 'f? h � P . � 6 Section 2: Conditions and Requirements Summary Preliminary Conditions of Short Plat Approval -Attached i ` � �� DEPARTMENT OF COMMUNITY � �, �city°f;� � .�Y � AND ECONOMIC DEVELOPMENT �[' �,�,��;�`�' �.5 �<•�1 ADMINISTRATIVE SHORT PLAT REPORT & DECISION A. SUMMARYAND P�IRPOSE OF REQUEST REPORT DATE: August 8, 2014 Project Name: NE 7th St North, Phase II Short Plat Project Number. LUA14-000868, SHPL-A � � Project Manager: Clark H. Close,Associate Planner Owner: Ron Craig,Attorney-In-Fact for Bettyjean Craig,22821 112th Place SE, Kent,WA 98031 Applicant: Kyle Miller, KRRV DEV., LLC, P.O. Box 908, Ravensdale,WA 98051 Contact: Darrell Offe,Offe Engineers, 13932 SE 159th PI, Renton, WA 98058 th Project Location: 3518 NE 7 Street, Renton,WA 98056 ProjectSummary: The applicant is requesting approval of a 4-lot short plat of 3518 NE 7th Street (APN 801110-0055) totaling 28,687 square feet (0.66 acres) for the future development of 4 single-family houses.The subject property is located at 3518 NE 7th Street, west of Queen Avenue NE within the Residential-8 dwelling units per acre (R-8) zone. The proposed lots range in size from 6,242 gross square feet to 7,874 gross square feet. The residential density is 7.87 dwelling units per net acre. Access to proposed lots would be from NE 7th Street utilizing a private street that includes a 26-foot wide easement and 20-foot wide paved road. Half street frontage improvements will be completed along NE 7th Street. Na sensitive areas or special features are located on the proposed project site which slopes to the southwest. Fi�e trees are proposed to be retained. The existing house would be removed to accommodate the proposed project. A Geotechnical Report was conducted by Robert M. Pride, LLC on May 5, 2�14, indicating that infiltration of stormwater is feasible at the site. Site Area: 28,687 SF - � � '�:J:qo]n5 N:N:itYC• ',. r.,��•7 LI�1CiKt5C� �l'iy! „�.-+i (6 'I '5�.' J�7t0001E0 II d01'fOGi�J' •.=Y4 1J111JL��Y,O d(�'t'.�i(�'� vi�..l.;'i�n� �I� 5' I �:iu x�i es I '�, `�� L01t�J007� � �'Y 6 � q � _ - � r�` 3~31i'�00"5 ��; � ai.�H�c+>n a2 I � an,nmr;; ,-ta ?jj l� Project Location Map s�,ort��ot RePort z4-000s6a City of Renton Department of Community&Economic Development Administrative Short Plat Report&Decision NE 7'"ST NORTH,PHASf 11 SHORT PLAT LUA14U00868,SHPL-A Report of August 8th, 2014 Page 2 of 14 B. EXH/BITS: Exhibit 1: Short Plat Staff Rep�rt and Administrative Decision Exhibit 2: Neighborhood Detail Map Exhibit 3: Preliminary Plat Map Exhibit 4: Topographic Map Exhibit 5: Tree Cutting/Land Clearing Plan Exhibit 6: Landscape Plan Exhibit 7: Utilities/Grading/Drainage Plan Exhibit 8: Geotechnica� Report prepared by Robert M. Pride, LLC, dated May 5, 2014 Exhibit 9: Drainage Report prepared by Offe Engineers, PLLC,dated July 1, 2014 Exhibit 10: Construdion Mitigati�n Exhibit il: Safe Walking Routes to Honey Dew Elementary Exhibit 12: Advisory Notes to Applicant C. GENERAL INFORMATION: 1. Owner(s)of Record• Ron Craig,Attorney-In-Fact for Bettyjean Craig, . 22821 112th Place SE, Kent,WA 98031 2. Zoning Classificati�n: Residential-8 du/ac(R-8) 3. Comprehensive Plan Land Use Designation: Residential Single Family(RS) 4. Existing Site Use: Single Family Residential 5. Neighborhood Characteristia: a. North• Single Fomily Residential(R-8 zoneJ b. East• Single Family Residential(R-8 zoneJ c. South: Single Family Residential(R-8 zoneJ d. West• Single Family Residential(R-8 zone) 6. Access: A shared driveway from a NE 7t''Street for all four lots 7. Site Area: 28,687 SF(0.66 acres) D. HISTORICAL/BACKGROUND: Action Land Use File No. Ordinance No. Date Comprehensive Plan N/A 5099 11/01/2004 Zoning N/A 5100 11/01/2004 Annexation N/A 1475 03/25/1954 E APPLICABLESECTIONS OFTHE RENTON MUN/C/PAL CODE: 1. Chapter 2 Land Use Districts a. Section 4-2-020: Purpose and Intent of Zoning Districts Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short Plat Report&Decision NE 7'H ST NORTH,PHASE fl SHORT PLAT LUA14000868,SHPL-A Report of August 8th, 2014 Page 3 of 14 b. Section 4-2-060:Zoning Use Table—Uses Allowed in Zoning Designations c. Section 4-2-110: Residential Development Standards d. Section 4-2-115: Residential Design and Open Space Standards 2. Chapter 4 Property Development Standards a. Section 4-4-030: Development Guidelines and Regulations—General b. Section 4-4-130:Tree Retention and Land Clearing Regulations 3. Chapter 6 Streets and Utility Standards a. Section 4-6-060:Street Standards 4. Chapter 7 Subdivision Regulations a. Section 4-7-070: Detailed Procedures for Short Subdivisions b. Section 4-7-120:Compatibility with Existing Land Use and Plan—General Requirements and Minimum Standards c. Section 4-7-150: Streets—General Requirements and Minimum Standards d. Section 4-7-170: Residential Lots—General Requirements and Minimum Standards 5. Chapter 9 Permits—Specific 6. Chapter 11 De�nitions F. APPLICABLE SECT/ONS OF THE COMPREHENSIVE PLAN: 1. Land Use Element 2. Community Design Element . G. DFPARTMENTANALYSlS: ' 1. Proiect Description/Background The applicant has proposed to subdivide a 0.66 acre (28,687 square feet) site,an infill subdivision project, located within the Residential—8 dwelling units per acre (R-8)zone.The subject property is , located at 3518 NE 7th Street,which is east of Monroe Avenue NE and west of Queen Avenue NE (Exhibit 2).The proposal would create a total of four(4) lots intended for the development of detached single-family residences(Exhibit3).There is an existing one-story, single-family residence, built in 1947, located on the south end of the site on proposed lots 1 and 2 and a shed on proposed lot 3 that will all be removed for the new residences.The proposed lots range in size from 6,242 gross square feet to 7,874 gross square feet. Density would be 7.87 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.The proposal is consistent with these density requirements. No critical areas are located on the proposed project site which slopes across the property from the northeast corner to the southwest corner(Exhibit 4).There are 23 existing trees deemed to be "significant" on the site.The applicant proposes to retain five(5)of these trees,while seven (7)will be removed as part of road construction (Exhibit 5).The applicant proposes to comply with required City of Renton landscaping standards for the final short plat by providing a 10-foot landscaped strip along the public street frontage (Exhibit 6). According to geologic mapping for this area of Renton the property consists of fine silty sands underlain by medium dense to dense weathered glacial till (Qvt)deposits consisting of gravelly sands and sandy gravels with silt(Exhibit 8).The geotechnical report indicated minor seepage encountered at one (1) of the three (3)test pits.The report concludes that onsite infiltration would perform adequately for moderate storm water discharge into the upper 2.5 to 3.0 feet of native gravelly sands and sandy Short P/at Report 14-000868 � � City of Renton Department of Community&Economic Development Administrative Si►ort Plat Report&Decisipn � fYE 7"'ST NORTH,PHASF!l SHORT PLAT LUA14-000868,SNPL-A � Report of August 8th,2014 Page 4 of 14 � � gravels. Appropriate design,construction and maintenance measures will be required to ensure the � infiltration rate can be effectively maintained over time. J � 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(6}(a). � 3. Compliance with ERC Conditions � N/A � J 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 this report(Exhibit 12). j 5. Consistencv with Short Plat Criteria 1 Approval of a plat is based upon several factors.The following short plat criteria have been established -j to assist decision-makers in the review of the plat: `, � SHORT PLAT REVIEW CRITERIA: Approval of a plat is based upon several factors. The following short plat � criteria have been estabiished to assist decision-makers in the review of tne plat. �� (✓ Compliant; Note 1: Partially compliant; Note 2: Not compliant; Note 3: Compliance not yet � demonstrated) 1.CONFORMANCE WITH THE COMPREHENSIVE PLAN: � The site is designated Residential Single Family(RS)on the Comprehensive Plan Land Use Map. Lands in the _� RS designation are intended to for high quality detached, single-family residential development organized 1 into neighborhoods at urban densities. It is intended that larger subdivisions, infill development, and } rehabilitation of existing housing be carefully designed to enhance and improve the quality of single family living environments. The proposal is consistent with the following Comprehensive Plan Land Use and � Community Design Element policies, if all conditions of approval are met, unless noted otherwise: ; Policy LU-158. Net development densities should fall within a range of 4.0 to 8.0 dwelling j units per acre in Residential Single Family Neighborhoods. ✓ Staff Comment: The applicant would be requrred to dedicate a 6,551 square feet of area for � right-of woy dedicatioRs.As a result, the net square footage of the site wouJd be 22,136 - square feet(0.51 net acresJ. The four lot proposal would arrive at a net density of 7.87 ) dwelling units per acre(4 lots/0.51 acres=7.87 du/ac). The proposed density is within the � preferred range. � Objective CD-C. Promote reinvestment in and upgrade of existing residential neighborhoods � � through redevelopment of small, underutilized parcels with infill development, modification and alteration of older housing stock,and improvements to streets and sidewalks to � increase property values. Policy CD-14. Infill development,defined as new short plats of nine or fewer lots,should be `j � encouraged in order to add variety, updated housing stock, and new�itality to � neighborhoods. Policy CD-15. Infill development should be reflective of the existing character of established g Sf�ort Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short P/at Report& Decision IYE 7�ST NORTH,PHASE!!SHORT PLAT LUA14-000868,SHPL-A Report of August 8th,2014 Page 5 of 14 neighborhoods even when designed using different architectural styles, and/or responding to more urban setbacks, height or lot requirements. Infill development should draw on Note 1 elements of existing development such as placement of structures,vegetation,and location of entries and walkways,to reflect the site planning and scale of existing areas. Staff Comment:Proposed!ot sizes are generally smaller than existing lots, although recent similar subdivisron of land in the oreo has created similor-sized lots on NE 7"'Street. Detailed site and orchitectura!designs, which would be reviewed to determine compatibility with the context of the site, are not yet available. 2. COMPLIANCE WITH THE UNDERLYING ZONING CLASSIFICATION: Objectives and policies of the Comprehensive Land Use Plan (RS) designation are implemented by Residential 8 zone (R-8). RMC 4-2-i10A provides development standards for development within the R-8 zoning classification. The proposal is consistent with the following development standards if all conditions of approval are met, unless noted otherwise: Density:The minimum density allowed in the R-8 zone is 4 du/ac and the maximum density permitted in the R-8 zone is S.0 du/ac. Net density is calculated after the deduction of critical areas, areas intended for public rights-of-way, and private access easements. Calculations for minimum or maximum density that result in a fraction that is 0.50 or greater shall be rounded up to the nearest whole number. Those density calculations resulting in a � fraction that is less than 0.50 shall be rounded down to the nearest whole number. Staff Comment:After subtracting approximately 6,551 square feet of proposed right-of-woy dedications and private occess easements, the net square footoge of the site is 22,136 square feet(0.51 net ocresJ. The 4-lot proposa!would arrive at a net density of 7.62 dwelling unirs per ocre (4 lots /0.51 acres = 7.87 du/acJ, which falls within the permitted densrty range for the R-8 zone. Lot Dimensions:The minimum lot size permitted in the R-8 zoning designation is 4,500 square feet for parcels greater than 1 acre, and 5,000 sq.ft.for parcels 1 acre or less.The minimum lot width is 50 feet for interior lots and 60 feet for corner lots. Lot depth is required to be a minimum of 65 feet. Staff Comment: The following toble identifies the proposed dimensions for Lots 1-4: Proposed Lots tot Size Width Depth (5,000 SF minimumJ (50 or 60 feet minimumJ (65 feet minimumJ '� 6,720 SF(GrossJ Loi 1 4,900 SF(NetJ 96 feet 70.02 feet Loi 2 6,242 SF(GrossJ 96 feet 65.01 feet 4,422 SF(NetJ 7 874 SF(GrossJ Lot 3 4,855 SF(NetJ 96 feet 82.02 feet Lot 4 7,855 SF 96 feet 81.82 feet Setbacks: The required setbacks in the R-8 zone are as follows:front yord is 15 feet for the primary structure and 20 feet for the garage; interior side yard is 5 feet; side yard along a srreet is 15 feet for the primary strudure; and the rear yard is 20 feet. Staff Comment:AI!lots appear to contain adequate area to provide aU the required setback � areas for new residences. Compliance with building setback requirements would be reviewed at the time of building permit review. As shown on the preliminary site plan (Exhibit 3J all houses would meet the building setbock requirements. !n addition, the homes built on these new lots would 6e subject to RMC 4-2-115 Residential Design Standards. Short Plat Report 14-000868 City of Renton Department of Community& Economic Development Administrative Short Plat Report& Decision NF 7r"ST NORTH,PHASE 1!SHORT PL4T LUA14000868,SHPL-A , Report of August 8th, 2014 Page 6 of 14 I Building Standards: The R-8 zone permits one single family residential structure per lot. Accessory structures are permitted at a maximum number of two per lot with a maximum size of 720 square feet each, or a maximum of one per lot with a maximum of 1,000 square feet. Accessory structures are permitted only when associated with a primary structure located on the same parcel of land. The maximum building height in the R-8 zone is 30 feet. Building height is based on the measurement of the vertical distance from the grade plane to the average height of the roof surface.The grade plane is the average of existing ground level adjoining the building at II exterior walls.Where the finished ground level slopes away from the exterior walls,the Note 3 reference plane shall be established by the lowest points within the area between the , building and the lot line,or where the lot line is more than 6 feet from the building, ', between the building and a point 6 feet from the building. The maximum building coverage in the R-8 zone,for lots larger than 5,000 sf,is 35 percent or 2,500 sf,whichever is greater. , ' The maximum impervious surface area is 75 percent. Staff Comment: A demolition permit shall 6e obtained and all inspections and approvals completed for the removal of the existing single family home. This rs a condition of the short plat approval. The building standards for the proposed lots would be verified at the time of building permit review. Landscaping:Ten feet of onsite landscaping is required along all public street frontages,with the exce�tion of areas for required walkways and driveways per RMC 4-4-07�. Such � , landscaping shall include a mixture of trees, shrubs, and groundcover as approved by the Department of Community and Economic Development. Minimum planting strip widths between the curb and sidewalk are established according to the street development standards of RMC 4-6-060. Street trees and, at a minimum, groundcover are to be located in this area when present. Where there is insufficient right-of-way space or no public frontage, street trees are required in the front yard. ✓ Stoff Comment: There are no trees proposed within the londscape planter strip between the back of curb and sidewalk due to the addition of underground utilities as part of this project. Tree roots will negatively impoct the underground utilities at this location ond those trees are proposed to be relocated onsite. RMC 4-7-070F allows street rrees to be relocated onsite subject to approval of the Administrator.A minimum of two(2)trees are to be located in rhe front yard prior to final inspection. The applicant is proposing two(2)onsite maple trees at 1- � 1/2"caliper in the required ten feet of onsite landscaping along the public frontage. (Exhibit � 6J. In order to meet the landscoping requirements the 30 foot onsite londscaping strip shall - indude a mixture of trees, shrubs, and groundcover. This is a condition of the short plar . � approvaL The final detoifed landscape plan shall be submitted to and approved by the � Current Pfanning Project Manager prior to construction permit issuance. Tree Retention: RMC 4-4-130 required thirty percent of the trees shall be retained in a � residential development � Staff Comment: There are o total of 23 trees located onsite of which frve (5J are proposed to be retained. The appJicant is required to retain 30 percent of the trees located on site that i are not located wirhin critical areas, proposed rights-of-way and occess easements. The ) applicont indicates seven (7) trees onsire would be excluded from the tree retention ) Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short Plat Report&Decision NE 7�ST NORTH,PHASE ll SHORT PLAT LUA14-000868,SHPL-A Report of August 8th, 2014 Page 7 of 14 calculations due to their location in proposed right-of-way, utility, and access easement corridors; therefore, the five (5J trees proposed to be retained meets the minimum 30% tree retention requirement(Exhibit SJ. Parking: Each unit is required to accommodate off-street parking for a minimum of two � vehicles. Staff Comment: Sufficient area exists, on each lot, to accommodote off street parking for a minimum of two vehicles. 3. DESIGN STANDARDS: Residential Design and Open Space Standards (RMC 4-2-115) are applicable in the R-8 zone. The Standards implement policies established in the Land Use and Community Design Elements of the Comprehensive Plan. Compliance with Site Design Standards must be demonstrated prior to approval of the subdivision. Compliance with Residential Design Standards would be verified prior to issuance of building permits. The proposal is consistent with the following design standards, unless noted otherwise: N/A Lot Configuration:Standards apply to subdivisions of 4 or more street-fronting lots. Garages:The minimization of the visual impact of garages contributes to creating communities that are oriented to people and pedestrians, as opposed to automobiles.One of the following is required (some options are not listed here due to lack of site feasibility, i.e.garages accessed from alley): 1. Recessed from the front of the house and/or front porch at least 8 feet, or 2. Located so the roof extends at least 5 feet(excluding eaves) beyond the front of the garage for at least the width of the garage, plus the porch/stoop area,or Note 3 3. Sized so that it represents no greater than 50 percent of the width of the front fa�ade at ground level,or 4. Detached. The portion of the garage wider than 26 feet across the front shall be set back at least 2 feet. Staff Comment: Building plans, which would be used to determine visua!impoct of goroges, have not been su6mitted yet They would be su6mitted for building permit review. Primary Entry: Entrances to houses shall be a focal point and allow space for social interaction.One of the following is required: 1. Stoop: minimum 4 feet by 6 feet and 12 inches above grade, or Note 3 2• Porch: minimum 5 feet deep and 12 inches above grade. Exception:An ADA accessible route may be taken from a front driveway. Staff Comment:Building designs, which would be used to evaluate design of entrances, have not been submitted yet. They would be submitted for building permit review. Fa4ade Modulation: Buildings shall not have monotonous fa�ades along public areas.One of the following is required: 1. An offset of at least one story that is at least 10 feet wide and 2 feet in depth on Note 3 fa�ades visible from the street,or 2. At least a 2-foot offset of second story from first story on one street-facing fa�ade. Staff Comment: euilding designs, which would be used to evaluate design of fa�ades, hove not been submitted yet. 7hey would be submitted for buildrng permit review. Windows and Doors:Windows and front doors are an integral part of the architectural Note 3 character of a house.Windows and doors shall constitute 25 percent of all fa�ades facing Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short P/at Report&Decision NE 7"'ST NORTH,PHASE ll SHORT PLAT LUA14-000868,SHPL-A Report of August Sth,2014 Page 8 of 14 street frontage. Sraff Commenr:Building desrgns, which would 6e used to evaluate design of windows and doors, have not been submitted yet. They would be submitted for building permit review. Lot 1 would need to, at minimum, meet the openings requirement of 25 percent for two facades, namely the fa�ade facing NE 7`h Street and Pierce Avenue NE. Scale, Bulk,and Character: Neighborhoods shall have a variety of home sizes and character. Abutting houses shall have differing architectural elevations. Note 3 Sroff Comment:Building designs, which would be used to evaluate scale, bulk, and character of structures, and design of windows and doors have not been submitted yet. They would be submitted for building permit review. Roofs: Roof forms and profiles are an important architectural component.One of the following is required: 1. Hip or gabled roof with at least a 6:12 pitch for the prominent form of the roof Note 3 (dormers,etc., may have lesser pitch), or 2. Shed roof. Staff Comment:euilding designs, which would be used to evaluate roof forms, have not been submitted yet They would be submitted for building permit review. Eaves: Eaves and overhangs act as unifying elements in the architectural character of a house. Both of the following are required: 1. Eaves projecting from the roof of the entire building at least 12 inches with horizontal fascia or fascia gutter at least 5 inches deep on the face of all eaves, and Note 3 2. Rakes on gable ends must extend a minimum of 2 inches from the surface of exterior siding materials. Staff Comment:euilding designs, which would be used to evaluate design of eaves and overhangs, have not been submitted yet. They would be submitted for building permit review. Architectural Detailing:Architectural detailing contributes to the visual appeal of a house and the community. If one siding material is used on any side of the dwelling that is two stories or greater in height,a horizontal band that measures at least 8 inches is required between the first and second story.Also, one of the following is required: Note 3 1. Minimum 3-1/2 inch trim surrounds all windows and details all doors,or 2. A combination of shutters and minimum 3-1/2 inch trim details all windows and minimum 3-1/2 inch details all doors. Staff Comment:euilding designs, which would be used ro evaluate architectural detailing, have not been submitted yet. They would be submitted for building permit review. Materials and Color:A variety of materials and color contributes to the diversity of housing in the community.Abutting houses shall be different colors. Color palettes for all new dwellings, coded to the building elevations,shall be submitted for approval.Additionally, one of the following is required: Note 3 1. A minimum of 2 colors shall be used on the building(a main color with different trim color is acceptable),or 2. A minimum of 2 different siding materials shall be used on the building. One siding material shall comprise a minimum 30 percent of the street-facing fa�ade. If masonry Short Plat Report 14-000868 City of Renton Departmenf of Community&Fconomic Development Administrotive Short Plat Report&Decision -' NE 7"'ST NORTH,PHASE!1 SHORT PLAT LUA14-000868,SHPL-A Report of August 8th,2014 Page 9 of 14 siding is used, it shall wrap the corners no less than 24 inches. Staff Comment:euilding designs, which would be used to evaluote material and color choices, have not been submitted yet. They would be submitted for building permit review. 4.COMPLIANCE WITH SUBDIVISION REGULATIONS: RMC 4-7 Provides review criteria for the subdivisions. The proposal is consistent with the following subdivision regulations if all conditions of approval are complied with: Access: Each lot must have access to a public street or road.Access may be by private access easement per the requirements of the street standards. � Staff Comment:Access to the new lots would be from NE 7"'Street utilizing a 20 foot wide paved private street within a 26 foot wide eosement. The proposed access easement is a � condition of the short plat approvaL The access easement shall be recorded prior ro, or concurrent with, the recording of the short plat. Streets:The proposed street system shall extend and create connections between existing streets per the Street Standards outlined in RMC 4-6-060 Street Standards. Stoff Comment:InstalJation of curb, gutter, 8'wide landscoped planter, and 5'wide sidewalk, on the full frontage of the parte!being developed is required.Additional right-of- way dedicotion is not required on NE 7th Street. The proposed privote road, Pierce Avenue IVE, has an easement width of 26 feet and a paved width of 20 feet and must have a minimum pavement thickness of 4"of asphalt over 6"of crushed rock ro meet City of Renton standards(RMC 4-6-060J.2). � The privcrte road is situQted fully within the boundaries of the subje��short plat site at 3518 NE 7th Street and extends into the property 217.06 feet. A hammerhead turnaround is proposed for the private rood, Pierce Avenue NE. Fire emergency occess and turn around is achieved through the construction of these two roads. Lots 2, 3, and 4 ore proposed to gain occess via the private road. The access for Lot 1, which fronts on NE 7th St,shall also be from the private road. Paving and trench restorotion will comply with the City's Trench Restoration and Overlay Requirements and a!1 utilities serving the site are required to be underground. Any rockeries or retoining walls, greater than 4 feet in height, will require a separate building permir.Structural calculotions and plans sha11 be submitted for review 6y a licensed engineer. Special Inspection is required. N/A Blocks: Blocks shall be deep enough to allow two tiers of lots. Staff Comment:No new blocks would be formed. Relationship to Existing Uses:The proposed project is compatible with existing surrounding uses. '� Staff Comment: The properties surrounding the subject site are all single family residences ' and are zoned R-8 on the City's zoning maps. The proposal is similar to existing development patterns in the area and is consistent with the Comprehensive Plan and Zoning Code. 5.AVAILABILITY AND IMPACT ON PUBUC SERVICES: � � Police: The Renton Police Department has commented that the proposed project would I' have minimal impad on police services. Fire: Sufficient resources exist to furnish services to the proposed development, subject to � the condition that the applicant provides Code required improvements and fees. The applicant would be required to pay an appropriate Fire Impact Fee.The fee, as determined by the Renton Municipal Code at the time of payment, shall be payable to the City at the Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short Plat Report&Decision A NE 7"'ST NORTH,PHASE ll SHORT PLAT LUA14-000868,SHPL-A Report of August 8th,2014 Page 10 of 14 time of building permit issuance. Currently this fee is assessed at $479.28 per each single family lot.Credit will be granted for the existing home that is to be removed. The fire flow requirement for a single-family residence is minimum 1,000 gpm for dwellings up to 3,600 SF (including garage and basement). If the dwelling exceeds 3,600 SF, a minimum of 1,500 gpm would be required. A minimum one fire hydrant is required within 300 feet of the proposed lots. Fire Department apparatus access roadways are required to be a minimum of 20-feet wide fully paved, with 25-feet inside and 45-feet outside turning radius. Fire access roadways shall be constructed to support a 10-ton vehicle with 322-psi point loading. Access is required within 150-feet of all points on the buildings. Dead end streets that exceed 150- feet in length require an approved turnaround. Proposed hammerhead appears adequate. Schools: It is anticipated that the Renton School District can accommodate any additional students generated by this proposal at the following schools: Honey Dew Elementary, Dimmitt Middle School and Renton High School. A School Impact Fee, based on new single- family lot, will be required in order to mitigate the proposal's potential impacts to the Renton School District. The fee is payable to the City as specified by the Renton Municipal Code. Currently the fee is assessed at$5,455.00 per single family residence. Credit would be ✓ given for the one(1) existing residence. Honey Dew Elementary School is located on Union Avenue NE, northeast of the proposed short plat.The Renton School District has produced a map identifying safe walking routes to the elementary school. The route from the site travels east on NE 7`h Street, east through Kiwanis Park and across Union Ave to the Honey Dew Elementary (Exhibit I1). Students would be transported by bus to McKnight Middle School and Hazen High School. Safe routes to schools are available. Parks:Although there would be no significant impacts to the City of Renton Park System anticipated from the proposed project, an impact fee is required of all new residential � development. Park impact fees shall be paid prior to issuance of building permits.This fee is assessed per new single family lot at the rate in place at the time the building permit is issued.As of the date of this report,the fee is$963.01 per dwelling.Credit would be given for one (1)existing residence. Storrnwater: A drainage report, dated July 1, 2014 was prepared by Offe Engineers, PLLC. (Exhibit 9) and submitted with the land use application. Based on the City's flow control map, this site falls within the Peak Rate Flow Control Standard Existing Site Conditions. The applicant engineer has included information in the drainage report that flow control is not required. The drainage report mentions that the new pollution generating impervious , surface (PGIS) is less than 5,000 square feet PGIS threshold for requiring water quality treatment.The report mentions that storm water BMP's will be applicable on the individual lots. Drainage plans and a final drainage report based on the City adopted 2009 King County Surface Water Drainage Manual and City Amendments is required to be submitted with the � utility construction permit. There are no sensitive areas on the project site. The property has a gentle slope of approximately three percent (39'0) towards the southwest corner of the property. The site drainage currently sheet flows across the property to the southwest corner. The flow continues down the shoulder of the road and into a new City storm system installed as part of the NE 7"' North Short Plat. The proposed development is to convey the drainage from the site into NE 7�' Street and then to the west into the City storm system.The NE 7th storm system continues west and connects to the storm within Newport Court NE. Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Short Plat Report&Decision NE 7T"ST NORTH,PHASE Il SHORT PLAT LUA24000868,SHPL-A Report of August 8th,2014 Page 11 of 14 A geotechnical recommendations letter (dated May S, 2014), for the site, was submitted containing information on the water table, soil site conditions and infiltration (Exhibit 8). The report identifies the soils as very dense glacial till (Qvt) that consist of fine silty sands. Three test pits encountered an upper thin layer of topsoil and silty sands that were underlain by medium dense to dense weathered glacial till deposits consisting of gravelly sands and sandy gravels with silt. Minor seepage was encountered in one of the test pits. The results indicated that onsite infiltration of stormwater be allowed to discharge periodic storm water into the upper 2.5 to 3.0 feet of native gravelly sands and sandy gravels. Final recommendations from the geotechnical engineer regarding infiltration will be reviewed with the construction permit. Stormwater drainage plans for individual lots will be required prior to issuance of construction permits. Surface water system development fee is$1,228.0� per new lot. Fees are payable prior to issuance of the construction permit. Credit will be given for the existing house. Water Service:Water service will be provided by City of Renton.Water service details will be reviewed upon construction permit application.The following comments are based on assumptions of the final layout: 1. A fire hydrant is proposed near the entrance of the proposed private road with NE 7th Street.Submitted project description does not include plans for larger houses. Therefore,the 4"diameter water main in the proposed private road is fine. 2. Water service details will be reviewed upon construction permit application.The current submitted plans show a dead end private road with a hammerhead.A 4" water � main line is shown extending from the existing 8"water main on NE 7th Street fronting , the site up to the south property line of the proposed Lot 4. ' 3. The water main is to be located at a minimum distance of four feet from the edge of the pavement of the private road. Relocate the water main from the location shown in the utility plan sheet.The minimum horizontal separation between water and sewer main is 10 feet. 4. The minimum diameter of individual lot water service and setter is 1 inch. 5. System development fee for water is based on the size of the new domestic water meter that will serve the new home on each new lot.The 2014 fee for%-inch or 1-inch water meter install is$2,809.00.Separate water meters shall be provided to each lot. Credit may apply for the existing home. Sanitary Sewer Service:Sewer service will be provided by City of Renton.Water service details will be reviewed upon construction permit application.The f�llowing comments are based on assumptions of the final layout: Individual side sewers must be provided to serve each lot. 1. An 8 inch diameter sewer main connecting with the sewer manhole/sewer main on the south side of NE 7th Street is proposed.The sewer manhole/sewer main located at the ✓ south side of NE 7th Street has been recently constructed by the NE 7th Street Middle short plat and has not yet been accepted by the City. If there is an issue with the sewer connection, alternate sewer connedion should be provided to serve the proposed 4 lots. 2. Required 10 feet separation between the proposed sewer main and the water main should be provided. 3. The sewer main extension along the frontage of NE 7th Street is required,or the applicant is required to show during the utility construction stage that sewer connection Short Plat Report 14-000868 City of Renton Deportment of Community&Economic Development Administrotive Short Plat Report&Decision NE 7�ST NORTH,PHASE ll SHORT PLAT LUA14000868,SHPL-A Report of August Sth, 2014 Page 12 of 14 from the sewer manhole on the south side of NE 7th Street to serve the lots on the east of the subject site will be possible. 4. Service details will be reviewed with the construction permit. Plans must meet minimum city standards. 5. This proposal is located in the East Renton Interceptor Special Assessment District (SAD).This SAD fee is$316.80 per connection and shall be paid at the time a utility construction permit is issued. 6. Sanitary Sewer System Development Fee(SDC) is based on the size of the domestic water meters.These fees are collected at the time a construction permit is issued.The 2014 SDC fee for a 1" sewer is$2,033.00.Credit will be given for the existing home if previously connected to sewer. Fees are payable prior to issuance of the construction permit. ; Transportation: The proposed short plat is also anticipated to generate additional traffic on ' ', the City's street system, due to increase vehicle trips to and from the proposed project.The '� ! � applicant would be required to pay an appropriate Transportation Impact Fee. The fee, as determined by the Renton Municipal Code at the time of payment, shall be payable to the City prior to building permit issuance. Currently this fee is assessed at $1,430.72 per new single family home. H. FIND/NGS: Having reviewed the written record in the matter,the City now enters the following: 1. Request:The applicant is requesting an Administrative Short Plat in order to subdivide a 28,687 square foot parcel, into four(4) single family lots suitable for development with single-family residential � structures.The proposal would result in a density of 7.87 dwelling units per net acre. � 2. Application:The property, located at 3518 NE 7th Street, is owned by Ron Craig,Attorney-In-Fact for 1 Bettyjean Craig.The application was submitted and determined complete on July 11, 2014. � 3. Comprehensive Plan:The property has a Comprehensive Plan land use designation of Residential � Single-Family(RS).The proposed project furthers the objecti�es and policies of the RS section of the � Land Use Element of the Comprehensive Plan.The objectives and policies of the Community Design Element are also supported by the project as it has been proposed. 4. Zoning:Objedives and policies of the RS designation are implemented by standards and regulations of the Residential 8 zone.The project,as proposed,meets or exceeds the R-8 zone standards and regulations. 5. Subdivision Regulations:The short plat, as proposed,would meet the requirements of RMC 4-7 Subdivision Regulations. 6. Existing Land Uses:The site has a single-family residential structure that was constructed in 1947, which is proposed to be removed. 7. Setbacks: Minimum setback requirements would be verified at the time of building permit review. 8. System Development Charges:As of the date of this report the Surface Water System Development Fee is$1,228.00 per new lot;the Water System Development Fee 1-inch water meter install is $2,809.00; and the Sanitary Sewer System Development Fee for a %-inch or a 1-inch water meter install is$2033.00 per new lot. 9. Public Utilities: Impacts to public services are assessed on a per single-family dwelling basis at the impact fee rate in place at the time the construction permit is issued.There are sufficient services available to serve the proposed plat. Short Plat Report 14-000868 City of Renton Department of Community&Economic Deve/opment Admrnistrotive Short Plat Report&Decision NE 7"'ST NORTH,PHASF!1 SHORT PLAT LUA1400Q868,SHPL-A Report of August 8th,2014 Page 13 of 14 10. Safe Routes to Schools:A safe pedestrian route is available between the project site and the elementary school, Honey Dew Elementary. Students attending Dimmitt Middle School and Renton _ High School would be transported by bus. � � l. CONCLUSION: 1. The subject site is designated Residential Single Family (RS) in the Comprehensive Land Use Plan and complies with the goals,objectives, and policies established with this designation. 2. The subject site is zoned Residential 8 (R-8) and complies with the zoning and development standards � established with this designation, provided the applicant complies with the Renton Municipal Code, and conditions of approval. 3. The proposed use is anticipated to be compatible with existing and future surrounding uses as permitted in the R-S zoning classification. 4. Staff does not anticipate any adverse impacts on surrounding properties and uses as long as the conditions of approval are complied with. 5. The proposed 4-lot short plat complies with the subdivision regulations as established by City Code and state law provided all advisory notes and conditions are c�mplied with. 6. The proposed NE 7th St North, Phase II Short Plat complies with the subdivision regulations and street `- standards as established by City Code and state law, provided the project complies with all advisory notes and conditions of approval contained herein. 7. Safe and efficient access and circulation has been provided for all users. S. There are adequate public services and facilities to accommodate the proposed short plat. 9. A safe pedestrian route is available between the project site and the schools. l. DECISION: The NE 7th St North, Phase II Short Plat, File No. LUA14-000868, SHPL-A is appro�ed and subject to the following conditions: 1. A demolition permit shall be obtained and all inspections and approvals completed for the removal of the existing single family home and accessory structures prior to Short Plat recording. 2. Access to Lot 1 shall be from the private road (PierceAvenue NE). 3. The applicant shall be required to record an access easement for the benefit of Lots 1-4. The access easement shall be recorded prior to,or concurrent with,the recording of the short plat. DATE OF DECISION ON LAND USE ACTION: SIGNATURE: � �� B 8 �!� Jennifer Henninq, Planning Director Date Deportment of Community& Economic Developmeni , Short Plat Report 14-000868 City of Renton Department of Community&Economic Development Administrative Si►ort Plat Report&Decision NE 7'F'ST NORTH,PHASE ll SHORT PLAT LUA14-000868,SHPL-A Report of August 8th,2014 Page 14 of 14 TRANSMITTED this 8th day of August, 2014 to the Contact/Applicant/Owner(5J: Con toct: Applican t: Owner.• Darre!!Offe, Offe Engineers, Kyle Miller, KRRV DEV.,LLC, P.O. Ron Craig,Attorney-ln-Foct for 13932 SE 159th Pl, Renton, WA Box 908, Ravensdale, WA 98053 Bettyjean Craig,22821 112th Place 98058 SE, Kent, WA 98031 TRANSMlTTED this Sth doy of August, 2014 to the Party(ies)of Record: John Kurtz Mike 8attin PO Box 2738 3410 Park Ave N Renton, WA 98056 Renton, WA 98056 TRANSMITTED this Sth day of August, 2014 to the following: C.E. "Chip"Vincent, CED Administrator Steve Lee, Development Engineering Manager Jan Conklin, Development Services Carrie Olson, DevelopmentServices Craig eurnelJ, euilding Offrcial Vanessa Dolbee, Current Planning Manager Fire MarshaJ Renton Reporter K. LAND USE ACTION APPEALS, REQUEST FOR RECONSIDERATlON, & IXPIRATION: The administrative land use decision will become final if the decision is not ap�ealed within 14 days of the decision date. 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 August 22,2014.An appeal of the decision(s)must be filed within the 14-day appeal period (RC1N 43.21.C.075(3);WAC 197-11-680). Renton Municipal Code Section 4-8-110.B governs appeals to the Hearing Examiner.Appeals must be filed in writing together with the required fee to the Hearing Examiner,City of Renton, 1055 South Grady Way, Renton,WA 98057.Additional information regarding the appeal process may be obtained from the City Clerk's Office, Renton City Hall-7th Floor, (425)430-6510. EXPIRATION:The administrative short plat decision will expire two (2)years from the date of decision.A single one (1)year extension may be requested pursuant to RMC 4-7-070.M. RECONSIDERATION:Within 14 days of the decision date,any party may request that the decision be reopened by the approval body.The approval body may modify his decision if material evidence not readily discoverable prior to the original decision is found or if he finds there was misrepresentation of fact.After review of the reconsideration request, if the approval body finds sufficient 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 14-day appeal time frame. THE APPEARANCE OF FAIRNESS DOCTRINE: provides that no ex parte(private one-on-one) communications may�ccur concerning the land use decision.The Doctrine applies not only to the initial decision, but to Appeals to the Hearing Examiner as well.All communications after the decision/approval date must be made in writing through the Hearing Examiner.All communications are public record and this permits all interested parties to know the contents of the communication and would allow them to openly rebut the evidence in writing.Any violation of this doctrine could result in the invalidation of the appeal by the Court. Short Plat Report 14-D00868 - . Q5E fl4T23v R5E E?12 _ . ----- . �- � ---= - - 4 F � `. . , `� F��4 �, GV �/ -- R-8-�� : �-- `CA_._. --- , �" - - ' 1e � �� i �. � - - - -- - � - � •�R 14- CV - — CV� _�_ _"R-40 -R-8 - - _-- -CA'.; - �-CA _ , �^ - -- -- - z � - - C� ------ I � �� R=70 '�CA � - - - I CV` --; RM-F - 6 ' ' ' _ f -C1��~ �� ` �— _.R:B _R-8 -_ -- -R� R=8 _ RM-� � � . . 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MI[ 0.J0.1/ 9'.LLI: 16 ApMA � L-01 N(R?ihl ��N.E I��-2O'-;)" 27"x�4"`kf-F1" sx¢r � a � � PORTION OF THE SE 1/4,SECTION 9,TOWNSHIP 23 N,RANGE 5 EAST,W.M. �«: szienno umi.x��Aiiann x�crvm�Reon u�F�vw�o.aure ONLY.IT 9H�LL BE THE CONiMCT011'9 AE9PON91&LITY TO OEtlRMME iME E�V.GT vERiIGSL ul�XORiZONiM1L LOG�TIpi OF KL O ;., �.� fJf 91M0 UNOERONOUNU�I l TE9 PHION IO COMMENCINO Q ,�� ;, ��C� GON6TRUGTpH.NOPCPRfBENT�TpN1EMMF1Ml�T�LLFMIETING �. r I ...� . �. I pesrons a Fo urntiarroisHovmer�nueaws�earexowm Q ......_. .. n:�u miHew ounorv. _ ..._.. __'�,_ ...... . .... _..�...`...� �.. 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DEiERYINEO BY fIFAD CONMilON4 I I � {', PRIVATE ROAD I�"' � � I ..� �'i[ I II_" M N 0 C� ! 01 �i ' �I � `t� I � ' .`1..,�-�. V � il � •...I�'�:' TREES TO NEAWN I W NI NIY � � a� j .�!.I.. I �...� i� '. .� �1 ii 1 , ,��r� I ;• I:" � i �` GRAPNICSCALE Y I � `� �� I i i'� � I \a l 0 la� i � / 1 � I ' �l ._ . ....._ ......... i I { . . ..., , . . � - !y ................. ............._ . ........... ........_.._..._. �:un-ao r..r �,.,,�.; _,�. � , .�. .. �;'� .. -.. uJli , � .`� e'i�NnsinPF SIc+PNr'...7th RECOAINEN�E�FOflp PflOVAL I _ � w.w..�w.: ' �. .,....WAi ...__.......... . .............. ........... ...._.. .. � ��A �+��"��?�?[ � S7REET � a -------- _ _` _._...�___ �.: ,._' --- ��4J �,—,, ,cpnn .i �ii�;r�c 5[WCR 9 WAIEfl MNN 4..N�.. • OFFE ENGINEERS r�¢��y'�'� '"�s""�""'j"N0 scut '��'��" A CITY OF NE 7TH NORTH PHASE 2 SHORT PLAT oe/oo/�o�� 175ci25oun[a�scles�7iP[.ACa �, �r � s � RENTON KRRV DEVELOPMENT,LLC x&r�n�oN,W�st�1GTt>N9BOSs `o.� � UTILITV/GfiADING/DRAINAGE PLAN 9B05! PHON9:l2S7b09/12 '�!},.��q: C uu N Ol0 �/tf i� OATuu �.,,�r�� ;N..1°��.� viannmu/e�imma/r�um worx.wpi. 3519 NE 7th STREET COMACT.DARRBLLOAPQP.H f�EMi.� N0. RENSION BY OATE MPft +'�+ ""�' � � I 07/27/201/ UTILITY ------� ' " Robert M. Pride, LL� Consulting Engineer MaY 5, 2oi4 Mr. Kyle Miller KRRV Developrrzent - P. O. Box 908 Ravensdale,VVA 98o5i Re: Geotechnical Recomrnendations Praposed Residences 3518 NE 7�Street Rentan, W�shington Dear Mr. Miller, This report summarizes the results of our site assessment and geologic research on the residential property located on the north side of NE� Street in Renton. It is understood that four new residences will be constructed on this new lot subdivision. The purpose of this report is ta deseribe existing site and subs�il conditions, and to pravide recammendations for disposal of starm water on the subject lots. Geologic mapping by Booth,et al in 200�along with prior investigations in this area�vere used as references for this report. Site Condi�tians This rectangnlar property is relatively flat and covers an area of about o.6 acres. There is an existing residence Iocated on the south end of the site on lots i and 2 that will be removed for the new residences. Access to these proposed residences wili be pravided by a driveway aff of� Street. According to geologic mapping for this area of Renton the properry is underlain by very dense glacial till(Qvt)that consist of fine silty sands and sands. Test pits were excavated on these lots to document existing subsoil and groundwater conditions, and to determine the potential far onsite infiltration. Three test pi�s encountered similar soil conditions consisting of an upger thin layer of topsoil and silty sands that were underlain by medium dense to dense weathered glacial till dEposits consisting of gravelly sands and sandy gravels with silt. Minor seepage tivas encountered in TH-2 at three feet,but was absent in the other 2 test holes. Summary lags of these test borings are as follocvs: TH-� Located�o feet south af SE carner of house on Lot x ` `�'' F °' t � ' _. . . _.__„� o.o to o.2ft Topsoil— Silty Sand _ � 0.2 to 2.5ft Graveliy Sand; € ' - ---'- __�_---., a��,.�. '+_'L ;� :� ?�;;�: 2•5 ta 4-5ft Sandy Gravel; g ncounterec�;- : _ -� Entire Document � � � -`' . �` Available Upon Request Robert M. Pride, �.�c EXHIBIT 8 Page 1 13203 Hoimes Point Drive IVE Kirklar�d,1�NA g8034 � � i N E 7�" North Ph se 2 Shart Pl�t �' a , 3518 NE 7t�' Street � Renton, Washington 98Q56 � , '� � � -�� -� , , , ,, DRAI(oIAGE RERORT � - , ; _�� ]u�y 1, 201� � , Prepared for; KRRV Development, LLC Attn: Kyte Miiler P.O. Box 908 Ravensdale, Washington 98051 (425)432-5932 office , Prepared by: ' Offe Engineers, PLLC �' ` Darrell Offe, P.E. • :' � 13932 SE 159"' Place • ' Renton, Washington 98Q58-7832 rt , (425) 2fi0-3412 office "'� - � �425) 227-946� fax ` '`�� ` �� f•r��t.��€��.�� Entire Document � '''"��Q,�.�,�a ` Available Upon Request ��ox�,� - ' 4 , � - .�� . � f EXHIBIT 9 � � �� ` � � � � � , NE�Nord�Phase 2 Short P/at 3518 NE7`h Street 4 Sing/e Family Residence CONSTRUCTION MITIGATION Proposed Construction Dabes(begin and end dabes): Sbrt af construction is proposed fior the Fall�nter 2014 with the demolition of e�dsdng structures and installation utilitiesJfrontage improvements. Frontage improvements abng NE 7"'Street wiB r�use minor disruption to traffic afong NE 7"' Street. These frontage improvements will indude: drainage, sewer extension, water crossings, paving, curb/gutter and sidewaik, and landscaping. Hours and days of operation: 8:30 am ta 3:30 pm, Monday through Friday or as otherwise allowed by Gty of Renton. Proposed Hauling/Transportation roubes: Materials and labor to the site are proposed of�af private aocess road abng the west side of#f�e property. Vehicle parking ar�d baddill material storage are proposed ta be onsite. Proposed additional material needed for the project wilf be hauled from the Sunset Quarry on Ren�on-Issaquah Road (SR-900). Tlie roube would Ixing the material along SR-900(Sunset} until NE 12�' Street; tuming left on 12"'then oontinuing to Monroe Avenue NE. Turning south an Monroe Ave. NE to NE 7�' Str+eet; then east up 7t'"to the project. Measures to minimize construction adivities: NE 7�`wip or could possibiy r�eed to be dosed for a portion of the frontage improvemer�ts. The sewer and sborm extension wil! be constn�cbon along tfie center of the paved section due to ifie proximity of an existing water main. This area of Rerrtort(along NE 7"� has a grid pattem to the roads. Partial iar�e d�ure in this sedion of rnad will be evaluabed as part of the traffic ' c�ritrol pEan. Special hours: No special hours are neoessary to complete construdian.Weekend work may be necessary to be scheduled for completion; this will be determined by owner, cantracbor, and C'rty of Renton. Prelim�nary Traffic Control Plan: Coorcf'nation with the City of Rer�ton s�aff will be nece�ary ta minimize disruption b�traffic on NE 7"'Street Once a oor�-acbor is selecbed,a traffic onntrof plan witl be submitted and apprwed prior to the pre-construction meetir�g witfi the City of Renton. This plan will be instalfed prior to any cor�struction activities. �� 32014 EXHIBIT 10 �,u€�� .�� J, :r.y�'�.,�i'v i�'O'� .,.;:t tJ� fw W N M� ,',�' nK � �� . ... � w�;� �.� '"�° � � � �7 � _ M .; � � „ �,-�� Mrwrrr►+rw� F�ovT�ydltrw Walk B�a�r,intla�ry �� chuaG � � � (D � 8 "t . � � A�du#1�ha��ot �_ � � � ,� �r■1 �rcnsw�ik �� "' �'x �' a � Tt�G Yro�tic51$�v�' � f � � � ' �� °� ,. .�» � � i S'ruat��t Pntrai �..•. � � � �" '� � 9 � � Pa�'k ;�: �tt�rp 5i�ir �� ;c'�+ �U ��' w � , � r"5' x r � � u � � ; ��,,, Walk Rout� `»,;fr� C.tlUttpry �� +� � �, � � �' � � � � - � � �. � � � � . ,#..,, �'��''�►�k N�.�.. ' �n'• f� �� 1� 3'� {,) ��r�ww�w�ww.�. �w��r�rw�r1M M�wNMM�u • � ��n �+W��wII1�IMMM�M iWMMW+k WMWAM�M MM�r ,m n ,� � � �� ,� 1 �'M �('� il! ��'�I�b {�� N �.+i M l�� '� �. � d� r '�.�. �� "ti"� r=i �.� �,.�.�. {� ri�. p'�'111':Ci i!a�V.4�£'�� M :17'm � �=r "" �� Ce�� r�t w,s ;J �,�,�, t�• „� � � � * � � � rav W. . 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",9 .� �...� ,R�', `i"� :� � t � � ^tl � � � � �.+15!�i�./1�7� "w��; h: . �I� l/ !t y�� , � �\,I!��W��,.�WIY�In.aA,MII��►.w�ww��Mw�k�M�t�Ilr W��Ny��w 11Alw�o�r"+�MMI�.'Fr+IMMIY�Yf i ��^M�1Mw�M i�MwW�r v�. wy � �YI�t� �. �. �_ �� _. ._� a i �� . ,_ , � . � � � ,_ � �_ . _, __ . _ __, .� _ . . `�_i � � � �J A� \� `�,./ �`..r'� '�-/ - PLAN REVIEW COMMENTS (LUA14-000868) � ciryof,�_ ��,��. -�....�.�� ` �� ^�� -��; PLAN A��RESS: NE 3518 TTH ST APPLICATION dATE: 07/02/2014 RENTON,WA 98056-3845 DESCRIPTION: The applicant is requesting approval of a 41ot short plat of 3518 NE 7th SVeet(APN 801110-0055)totaling 28,687 square feet(0.66 � _ acres)for the future development of 4 single-family houses.The subject property is located at 3518 NE 7th Street,west of Queen Avenue NE within the Residential-8 dwelling units per net acre(R-8)zone.The proposed lots range in size from 6,242 square feet to 7,874 square feet.The residential density is 7.8 dwelling unRs per net aae.Access to proposed lots would be from NE 7th Street utilizing a private street that includes a 26-foot wide easement and 20.foot paved road.Half street frontage improvements will be completed along NE 7th Street.No sensitive areas or special features are located on the proposed project site which siopes to the southwest Five trees are proposed to be retained.The existing house would be removed to accommodate the proposed project.A Geotechnical Report was conduc[ed by Robert M.Pride.LLC on May 5,2014,indicating that infiltration of stormwater is feasible at the site. — gineering Review Rohini Nair Ph: 425-430-7298 email: mair@rentonwa.gov Recommendations: Plan review comments for NE 7th North Phase II Preliminary short plat(LUA 14-000868) (Date:7/25/2014) 1 have completed a preliminary review for the abov�referenced 4 lot short plat proposal at 3518 NE 7th Street. The following comments are based on the application submittal made to the City of Renton by the applicant. EXISTING CONDITIONS WATER:The site is located in the City of Renton water service area. SEWER:The site is located in the city of Renton sewer service area. , STORM:There are no existing storm facili6es in ihe site frontage. STREETS:NE 7th Slreet is a residential street with a right of way width of 60 feet CODE REQUIREMENTS � Water 1. A fire hydrant is proposed near the entrance of the proposed private road with NE 7th Street. Submitted projed description does not indude plans for larger houses. Therefore,the 4'diameter water main in the proposed private road is fine. Informational comment-for larger houses (i.e.houses larger than 3,600 square feet)requiring fire flow rate of 1,500 gpm,a second fire hydrant will be required to be located near the hammerhead in the private road. In that scenario,the size of water main in the private road from NE 7th Street up to the new hydrant will need to be of 8"diameter,and beyond that the water main diameter can be 4". 2. Water service details will be reviewed upon construction permit application. The current submitted plans show a dead end private road with a hammerhead. A 4"water main line is shown eutending from the existing 8'water main on NE 7th Street fronting the site up to the south property line of the proposed Lot 4. 3. The water main is to be located at a minimum distance of four feet from ihe edge of the pavement of the private road. Reloqte the water main from the location shown in the utility plan sheet The minimum horizontal separation between water and sewer main is 10 feet i 4. The minimum diameter of individuai lot water service and setter is 1 inch. 5. System development fee for water is based on the size of the new domestic water meter that will serve the new home on each new lot The 2014 fee for'/.-inch or 1-inch water meter install is$2,809.00. Credit may apply for the existing home. li Sanitary Sewer ' 1. All lots of the short plat will be connected to the city of Renton sewer service. II 2. Individual side sewers must be provided to serve each lot. ( 3. M 8 inch diameter sewer main connecting with the sewer manholel sewer main on the south side of NE 7th Street is proposed.The sewer manhole/sewer main located at the south side of NE 7th Street has been recently constructed by the NE ' � 7th Street Middle short plat and has not yet been accepted by the C'dy. If there is an issue with the sewer connection,attemate sewer connection should be provided to serve the proposed 4 lots. 4. Required 10 feet separation beNveen the proposed sewer main and the water main should be provided. ' � 5. The sewer main extension along the frontage of NE 7th SVeet is required,or the appliqnt is required to show during the utility construction stage that sewer connection from the sewer manhole on the south side of NE 7th Street to serve the lots on " the east of the subject site will be possible. 6. Service details will be reviewed with the construction pertnit Plans must meet minimum city standards. 7. This proposal is located in the East Renton Interceptor Special Assessment DisVict(SAD). This SAD fee is$316.80 per connection and shall be paid at the time a utility consVuction permit is issued. 8. San'rtary Sewer System Development Fee(SDC)is based on the size of the domestic water meters. These fees are col{ected at the time a construction permR is issued.The 2Q14 SDC fee for a 1°sewer is$2;033A0. Credft may apply for the e�dsting house. Stortn 1. The SurFace Water System development fee for 2014 is$1,228.00 per each new lot Fee is payable prior to issuance of the construction pertnit. 2. A drainage repoR has be n. Based on the City's flow conVol map,this site falls within the P he applicant engineer has induded EXHIBIT 12 , August O6,2014 Page 1 of 4 information in the drainage repoR that flow control is not required. The drainage report mentions that the new pollution generating impervious surface(PGIS)is less than 5,000 square feet PGIS threshold for requiring water quafity treatrnent The report mentions that storm water BMP's will be applicable on the individual lots. Drainage plans and a final drainage report based } on the City adopted 2009 fGng County Surface Water Drainage Manual and City Amendments is required to be submitted with the � utility consUvction permit � � 3. A geotechnical report prepared in 2014 by Robert M Pride,LLC.was submitted by the applicant.The report mentions that " limited infiltration on the soils will be acceptable. Transportation 1. Instatlation of 0.5'wide curb,gutter,8'wide landscaped planter,and 5'wide sidewalk,on the full frontage of the parcel being developed is required.Additional right of way dedication is not required on NE 7th Street. A 32 feet wide(16 feet half street)paved surface is required on NE 7th SVeet to be consistent with the remaining paved width along the NE 7th SVeet cortidor_ 2. The proposed private street has easement width of 26 feet and has a pa�ed width of 20 feet.The minimum pavement thickness on a private street includes 4'of asphait over 6"of crushed rock_ The maximum grade for a private street shall not exceed 15°h. 3. A hammerhead tumaround is proposed for the private street. Ali the four lots of the short plat are proposed to gain access via the private street. 4. A street name and address sign will be required to be provided by the developer prior to recording. 5. Parking will not be allowed on the 20 feet wide paved private street and no parking signs are required to be installed by ihe developer. 6. All elecUipl,phone,and cable services and lines serving the proposed development must be underground. The ` construction of these franchise utilities must be inspected and approved by a City of Renton inspector prior to recording the plat 7. Traffic Impact Fees—The transportation impact fee s applicable on new houses based on the applicable fee at the time of � building pertnit application and payment is due at the time of issuance of the building pertnit. The 2014 fee rate is$1,430.72 per single family house. Credit may be given to the existing house that will be removed. � 8. A minimum of 5 feet separation is required between any access and property line. � 9. Fixed objecfs that may be situated in the location of ihe proposed access must be relocated,after obtaining owner approval. � 10. Informational comment—traffic safety guidelines mention a minimum of 20 feet between driveways. � General Comments � 1. All construction or service utility permits for drainage and street improvements will require separate plan submittals.All utility plans shall conform to the Renton Drafting Standards.Plans shall be prepared by a licensed Civil Engineer. 1 2. Wh�n u5li;y�plans a;e c:mplete,^rlease submit three(3)�pies of the drawings,two!21 copies of�e drainage report. permit application,an itemized cost of constrvction estimate,and applicaUon fee at ihe counter on the sixth floor. � (Date:7l25I2014) Planning Review Clark Close Ph: 425-430-7289 email: cclose@rentonwa.gov Recommendations 1.RMC section 4-4-030.C.2 limits haul hours behveen 8:30 am to 3:30 pm,Monday through Friday unless otherwise approved by the Development Services Division. 2.Commercial,multi-family,new single-famity and other nonresidential construction activities shall be resVicted to the hours between 7 am and 8 pm,Monday through Friday.Work on Saturdays shall be restricted to the hours between 9 am and 8 pm.No work shall be permitted on Sundays. 3.Within 30 days of completion of grading work,the applicant shall hydroseed or plant an appropriate ground cover over any portion of the sRe that is graded or Geared of vegetation and where no further construction work will occur within 90 days. Altemative measures such as mulch,sodding,or plastic covering as specified in the current King County Surface Water Management Design Manual as adopted by the City of Renton may be proposed between the dates of November 1 st and March 31st of each yeac The Developmertt Services Division's approval of this work is required prior to final inspection and approval of ' the pertnft. 4.The applipnt may not fill,excavate,stack,or store any equipment,dispase of any materials,supplies,or fluids,operate any , equipment,install impervious surfaces,or compact the earth in any way within the area defined by the drip line of any hee to be �i retained. � 5.The applicant shall erect and maintain 6-foot high chain link temporary construction fencing around the drip lines of all trees to , be retained,or along the perimeter of a stand of retained Vees.Placards shall be placed on fencing every 50 feet with the words,"NO TRESPASSING—Proteded Trees'or on each side of the fencing,'rf less than 50 feet Site access to individually ' protected trees or groups of Vees shall be fenced and signed.Individual trees shall be fenced on 4 sides.In addition,the , applicant shall provide supervision whenever equipment or trudcs are moving near Vees. Technical Services Bob MacOnie Ph: 425-430-7368 email: bmaconie@rentonwa.gov Technical Services Comments Created On:07128I2014 ' Short Plat Bob Mac Onie 07/28/2014 Note the Ciry of Renton land use action number and land record number,LUA14-000868and LND-20-0604,respectively,on the final short plat submittal.The type size used for the land record number should be smaller than that used for the land use action number. Show two ties to the City of Renton Survey Control Network. The geometry will be checked by the city when the ties have been provided. Although the coordinates shown purports to be based on the City's Survey Control Network(SCN),provide a dired tie , to a SCN monument as weli as its relationship to one other SCN monument. Provide suffident information to determine how the piat boundary was established. Include a statement of equipment and procedures used,per WAC32-130-100. Provide short plat and lot closure calculations. Note what was found when visiting the existing monuments. 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 caiculated,if any. The dty will provide addresses for the proposed lots as soon as possible. Note said addresses on the final short plat drawing. Do indude a"LEGEND'Wock for the short plat drawing,detailing any symbols used thereon. Do not include topography and utility infrastructure as they are only part of the initial submittal requirements unless they have a direct influence on the subdivision. Do note encroachments,if any. Note any relevant researched resources on the short plat submittal. Note the plat name and lot and Vaci numbers of the adjoining properties or note as`Unplatted'Do not use the tax parcel " identificatlon numbers. The City of Renton Administrator,PublicWorics Department,is the only city official who signs the final short plat Provide an appropriate approval block and signature line. Pertinent King County approval blocks also need to be noted on the drawing. All vested owner(s)of the subjec[final short piat need to sign the finai short plat drawing. Indude notary blocks as needed. Include a dedaration blodc on the drawing,titled"OWNERS'DECLARATION°rwt'CERTIFICATION'or other. Note that if there are easements,rnstrictive covenants or agreements to others;Gity of Renton,et�.}as part of this subdivision, they can be recorded concurrently with the final short plat. The final short plat drawing and the associated document(s)are to be given to the Project Manager as a package. The recording number(s)for the assodated document(s)are to be referenced on the final short plat drawing. Provide spaces for tfie recording numbers ihereof. The new easements for ingress,egress,utilities,etc.shown for the benefit of future owners of the proposed lots each need a note defining the rights associated with the easement at issue. Since these new'proposed private"easements aren't"granted and oonveyed"until the benefited andlor burdened lots are conveyed to others add the following language on the face of the short plat drawing: !I DECLARATION OF COVENANT: The ovmers of the land embraced within this short plat,in retum for the benefR to acqve from this subdivision,by signing hereon covenant and agree to convey the beneficial internst in the new private easements shown on ihis short plat to any and ali future purchasers of the lots,or of any subdivisions ihereof. This covenant shall run with the land as shown on this short plat The preceding statement obligates the seller of the lots created to`expressly grant and conve�'the lots'together with andlor subject to"any new private easements delineated on the short plat in the conveying document The private ingress,egress and utility easements require a"New Private Easement for Ingress,Egress and Utilities Maintenance AgreemenY statement Note the attachment on the drawing. viewer Comments Leslie Betlach Ph: 425�30-6619 email: LBetlach@rentonwa.gov Community Services Review Created On:08/06/2014 A.Environmental impac[Comments:Parks Impact Fees per Ordinance 5670 applies. B.Policy Related Comments:There are no impacts to Parks. C.Code-Related Comments:There are no impacts to Parks. Technical Services Created On:07126R014 Addresses haven't been assigned. - •e Review-Building Corey Thomas Ph: 425-430-7024 email: cthomas@rentonwa.gov Recommendations: Environmental Impact Comments: 1. The fire mitigation impact fees are currently applicabie at the rate of$47928 per single famify unit. This fee is paid prior to recording the plat Credit will be granted for the existing home that is to be removed. August 06,2014 Page 3 of 4 Code Related Comments: 1. The fire flow requirement for a single family home is 1,000 gpm minimum for dweilings up to 3,600 square feet(nduding garage and basements). If tfie dwelling exceeds 3,600 square feet,a minimum of 1,500 gpm fire flow would be required. A minimum of one fire hydrant is required within 300-feet of the proposed buildings and two hydrants if the fire flow goes up to 1,500 gpm. The exisGng fire hydrants are not within 300 feet of all of the proposed lots. 2. Fire departrnent apparatus access roadways are required to be a minimum of 20-feet wide fully paved,with 25-feet inside and 45-feet outside tuming radius. Fire access roadways shali be construded to support a 30-ton vehide with 322-Psi point loading. Access is required within 15afeet of ail points on the buildings. Dead end streets that exceed 150-feet in length require an approved tumaround. Proposed hammerfiead appears adequate Police Review Cyndie Parks Ph: 425-430-7521 emaii: cparks@rentonwa.gov Recommendations: Minimal impact on police services. � � � (�� `._ � ' August 06,2014 Page 4 of' Section 3: Offsite Analysis The downstream system was walked on June 2014. The site drainage currently sheet flows across the property to the southwest corner. The flow continues down the shoutder of the road and into a new City storm system installed as part of the NE 7th North Short Plat. The proposed development is to convey the drainage form the site into NE 7"' Street and then to the west into the City storm system. The NE 7"' storm system continues west and connects to the storm within Newport Court NE. The drainage system is completely tight lined from Newport Court NE/ NE 7�' Street through the City storm piping to an apartment site, Hilltop Homes Apartments downstream. The network of pipes runs approximately 1120 feet to a storm water pond within the Hilltop Apartments. The storm pipe system was visually inspected in three locations downstream; at CB #113111, CB #113118, and CB #113041. These are City of Renton storm water codes for City catch basins. The system of pipes was 12"concrete entering into Type II catch basins. There appeared to be no overtopping of the basins or capacity issues. The roadway area above these catch basins had no indication of overflow. The storm water enters into a pond within Hilltop Apartrnents, City node #145531. This pond is heavily over grown with trees and blackberries. A walk of the parameter of the pond shows no signs of overtopping or erosion. The parking lot to the south of the pond is about 4' below the pond berm. There were no signs of �� overtopping in this area either. ' The drainage leaves the pond and enters into Monroe Avenue NE about 200 feet north of NE 4�' Street. The I� storm system is within the centerline of the road and was not inspected. The storm system continues to the south in Monroe Ave until it enters the City Shop Area at NE 2th Street. Section 4: Flow Control and Water Quality Facility Analysis and Design FLOW CONTROL REVIEW Based upon the City Drainage Manual, the following steps are required to determine the mitigation of storm water runoff of the developed project: Full Dispersion- N/G (no good)-the property does not have 100 feet of flow path available on each new lot; Full Infiltration - N/G-the available soils on the property are silty sandy (Alderwood) soils and do not provide adequate depth for full infiltration. Limited Infiltration-acceptable-no ground water was found in the test holes below 6 feet, therefore limited infiltration using gravel filled trenches will be utilized to treat 1,000 square feet of developed impervious runoff. The gravel filled trenches will be installed at a depth to bottom of trench of 3'{36'�. The proposal is to mitigate all the Lots using gravel filled trenches located in the rear yards to treat 1,000 - square feet of impervious area; to utilize sheet flow of the driveway across the front yards to mitigate the runoff from the impervious area of the driveway; to utilize perforated pipe connection at the connection to the storm oonveyance system within the front yards. The frontage along NE 7th Street will be collected and conveyed into an existing public storm system located to the west within a previous short plat, NE 7th North. A curb and gutter will be installed along the west side of the private access road to collect the runoff from the road. This runofF together with the connection to each lot will be conveyed into the NE 7th Street - system. Based upon the attached analysis the following flows were developed to compare to existing runoff. Pre-Developed Condition (runof� Mitigated Developed Condition (runoff) 2 Year 0.053 cfs 2 year 0.114 cfs 10 year 0.086 cfs 10 year 0.137 cfs 100 year 0.184 cfs 100 year 0.244 cfs The difference between 100 year"Pre-Developed Condition"and"Mitigated Developed Condition"is , 0.244-0.184 = 0.060. The"Mitigated Developed Condition" runoff if less than 0.10 cFs during a 100 year storm event than the'�Pre-Developed Condition"runoff. Therefore, based upon the City Drainage Manual, no storm water detention is required for this project. The calculations for the above analysis are located within this Section. WATER QUALITY REVIEW The City Manual requires water quality treatment for projects that add 5,000 square feet or more of"new" pollution generating imperious surfaces (PGIS). The proposed developed (PGIS) condition consists of: DEVELOPED (PGIS) EXISTING (PGIS) ' Access Road 5,309 Sq. feet Driveway 1,105 sq. feet I Each Lot (D/W) 0 Sq. feet (mitigated) Asphalt in Road 1,406 sq. feet ' Frontage Widening 1,536 Sq. feet Shoulder 240 sq. feet Frontage Access Apron 160 Sq. feet Developed PGIS = 7,005 Square feet Existing PGIS = Z,751 sq. feet The proposed'�Developed Condition"generates 4,254 square feet of NEW PGIS. Based upon the City Drainage Manual this developed PGIS is less than 5,000 square feet and therefore water quality treatment is not required. L - NE 7th North Phase 2 (z) (3) Area Breakdown ** Impervious , (I) Mitigated Impervious Surface Deve%ped Condition LotArea Impervious Surfac�es Runoff Pervious Area Breakdown s , feet s , f e s . f t s , feet (so, feetl , (50% *(2)) (50% *(2JI Lots Lot 1 6719 House, walkways, patio 2300 1000 1800 500 Driveway 300 300 150 150 Road (PGIS) 1400 0 1400 Landscaping 2719 0 2719 3350 3369 Lot 2 6239 House, walkways, patio 2300 1000 1800 500 Driveway 300 300 150 150 Road (PGIS) 1460 0 1460 Landscaping 2179 0 2179 3410 2829 Lot 3 7871 House, walkways, patio 2300 1000 1800 500 Driveway 300 300 150 150 Road (PGIS) 2449 0 2449 Landscaping 2822 0 � 4399 3472 Lot 4 7855 House, walkways, patio 2600 1000 2100 500 Driveway 300 300 150 150 Road 0 0 0 Landscaping 4955 0 4955 2250 5605 � Frontage Sidewalk 320 320 Apron (PGIS) 160 0 160 NE 7th Street (PGIS) 1536 0 1536 Landscape strip 864 0 864 2016 15425 16139 0.35 0.37 Acres Ac�es **-Lot mitigation includes "limited Infilt�aion"of 1,000 square feet of roof area(c�edit SO% impervious�unoff) and 'sheet flow"dispersion of driveway(20'x IS) -each lot. Mitigation of 1,300 square feet per lot Ex%sti/�g Condition Impervious Pervious Area Breakdown Tota/Areas , feet s , feet Pa�e/ 28684 House 1820 Oriveway (PGIS) 1105 Walkways 512 Sheds (outbuildings) 148 Landscaping 25099 Frontage 2880 Aspahlt (PGIS) 1406 Compacted gravel shoulder (PGIS) 240 Lawn 1234 5231 26333 0.12 0.60 Acres Acres � Z � 1�1 Q J � V J a V NE 7"' North Phase 2 — existing condition �' � " �J ��. " � . : -_ .- Qrea ?� Till Forest 0.00 acres {�� Tili Pasture 0.00 acres �,, � Till Grass 0•60 ac�es � Ouiwash Forest 0.00 acres ' Outwash Pasture 0.00 acres '��,� ` � Outwash Grass 0.00 acres :-� ��;:� Wetland 0.00 acres � Impervious 0.12 acres ' 1 � " TOtB) �.72 BCfCS Scale Factor : 1.00 Hourly Reduced Time Series: NE 7th Phase 2 » Compute Time Series � Modiiy User Input � File for computed Time Series [.TSFj �; .. �:. ... .,_::- �:,..� �� —__.,-� --��, _��,.;��-�s�:�._ �. _ . _ _IJ xJ J Flow Frequency Analysis -------------------------------------------------------- Time Series File:ne 7th phase 2.tsf Project Zocation:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency A:�alysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob {CFS} fCFS} Period 0 .083 4 2i09i01 2:00 0.184 1 100.00 0 990 0 .053 ? 1i05i02 16:00 0.102 2 25.00 0 960 0 . 102 2 2i27iO3 7:00 0 086 3 10.00 0.90U O.u41 � 8f26iU4 2:00 0.083 4 5.00 0.800 0.053 6 10/28/04 16 00 0.079 5 3.00 0.66i 0.08fi 3 1i18i06 16:00 0.053 6 2. 00 0.500 0.079 5 11i24i06 3:04 0.053 7 1.30 0.231 0 .184 1 1i09i08 6:00 0.041 8 1 10 0.091 Computed Feaks 0. 157 50.00 0.980 � � � ► � , J � i �'_� NE 7"' North Phase 2 — developed condition �' �� J Area J ; j Till Forest 0.00 acres ;' J Till Pasture 0.00 acres : �j Till Grass 0.37 acres '_�;� Outwash Forest 0.00 acres _�% Outwash Pasture 0.00 acres ' '� Ouiwash Grass 0.00 acres --� ' -� Wetland 0.00 acres ....� J Impervious 0.35 acres l � Total 0.72 acres Scale Facior : 1.D0 Hourly Reduced Time Series: NE 7th Phase 2 Developed » Compute Time Series I Modity User lnput ( File for computed Time Series [.TSF� � '� ��- _��_.��.�� ..� ._ . , . =.1J.J � �� Flow Frequency Analysis -------------------------------------------------------- Time Series File:ne ?th phase 2 developed.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flrw Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank keturn Prob (CFS} (CFS) Period 0.118 5 2i09i01 2:00 0.244 1 100.00 0. 990 0.092 8 1i05i02 16:00 0.143 2 25.00 0.96U 0 143 2 2i27iO3 T:00 0.137 3 10.00 0.900 0_094 7 8i26i09 2:00 0. 124 4 5 00 Q 800 0.114 6 10i28iO4 16:00 0.118 5 3.00 0.66? 0_124 4 1i18i06 16:00 0.114 6 2.00 0.500 0.137 3 10i26i06 0:00 0.094 7 1 .30 0.231 0 244 1 1i09i08 6:00 0.092 8 1 . 1U 0 091 C�_�rr�p�.itFd Peaks 0.210 50.00 U 98U � �� ► Section 5: Conveyance System Analysis and Design The analysis of the new conveyance system is attached to this Section. The new conveyance system was analyzed using the"Rational Method of Analysis" per section 3.2 King County Drainage Manual. The calculated 25 year storm event was 3.96 cfs from runoff of the existing upstream area and the developed site rnnditions (NE 7�' North Phase 2 Short Plat). Based upon this flow, a backwater analysis was performed on the new system (see attached). The analysis concluded that the storm system is adequate to convey the 25 year event. Rationa/Method Runoff from Basin Z5 year event P(25) 3.4Q inches (from attached Isopluvials Map) A(T) 4.20 acres Areas A(1) 3.50 acres single family residential 1.4DU/GA - existing A 2 0.70 acres single family residential 5.7 DU/GA - development(NE 7th North) A(T) 4.20 acres Description of flow Path k0 Ll 250 feet sl 0.05 Lawn/landscaping 7.0 L2 220 feet s2 0.10 Nearly bare ground 10.1 L3 170 feet s3 0.08 Asphalt 20.0 Composite Runoff Coefficient A(1); C(1) 0.33 A(2); C(2) 0.54 C c0 3.50*0.33 + 0.70*0.54/4.20 0.37 Time of Concentration T(1) 250/60*{(7.0)*(0.05)**0.5)} 3 minutes T(2) 220/60*{(10.1)*(0.10)**0.5)} 2 minutes T(3) 170/60*{(20.0)*(0.08)**0.5)} 1 minute USE 7 minutes Compute i� i0=(aR)*(Tc) i0 = 2.66*7**-C►.65 OJ5 Compute I(25) I(25)=(P25)*(i25) I(25)=3.40*0.75 2.55 Q(25) = C*I(25)*A Q(25) = 0.37*2.55*4.20 3.96 cfs 3.2.1 RATIONAL.h4�.`i'HOD TABLE 3.2.1.A RLtNOFF COEFFIC[ENT S-"C" VALLJES FOR THE RAl'IONAL NiETHOD Generai Land Covers Single Family Residential Areas� Land Co�er (' Land Cover Density C Dense forest 0.10 0.20 DU/GA(l unit per 5 ac.} 0.17 Light forest 0.15 0.40 DU/GA(1 unit per 2.5 ac.) 0.20 Pasture 0.20 0.80 DU/GA(1 unit per 1.25 ac_) 0.27 �j �'� Lawns 0.25 1.00 DUlGA 0.30 ' Playgrounds 0.30 1.50 DU/GA 0.33� � Gravel areas 0.80 2.00 DUIGA 0.36 Pav2ment and roofs 0.90 2.5D DU/GA 0.39 Open water(pond,lakes, 1.00 3.00 DUlGA 0.42 wetlands) 3.50 DU/GA 0.45 4_00 DU/GA 0.48 4.50 DU/GA 0.51 �-it�-J 5_00 DUlGA 0.54 ` 5.50 DU/GA 0.57 6.00 DUIGA 0.60 �Based on average 2,500 square feet per lot of impervious coverage. For combinations of land covers listed above,an area-weighted"C�:x�i,"sum should be computed based on the equation C�_x A,_(C,x A,)+(CZ x A�)+.._+(C�x-in),where Ae={A,+.=�Z+.__+,4�),the total drainage basm area. ' TABLE 3.2.LB COEFFICIEI�i'S FOR THE R.4T[ONAL 1tETHOD"Ig�� EQUATION i Design Storm Return Frequency aR 6R 2 years 1.58 d_58 5 years 2.33 0.63 10 years � 2.44 0.64 25 years 2.66 { 0.65 � -�- 50 years 2.75 � 0.65 100 years 2.61 0.63 TASLE 3.2.1.0 kR VALUES FOR T,CiSING TIIE R.�TIONAL M1tETHOD Land Cover Category kR F�rest witfi heavy ground litter and meadow 2.5 Fallow or minimum tillage cultivation 4.7 �---"- Short grass pasture and lawns �, Nearly bare ground :�10.1`'� Grassed waterway 15.D Paved area(sheet flow)and shallow gutter flow 20.0 � ?(N)9 Surface Watcr th:siQn'��tanual l;'9:20U9 � 3-13 SEC1'ION 3.2 ItIJNOFF'COlY1PU"i:AT lON ANll:4NALYSIS ME'I'HODS F'IGURE 3.2.1.0 25-YEAR 2�-HOL"R ISOPLLVIALS `__ �S ---- - --- - - 26 � -- -- -- -- -- ---- -- ,- ?> -_ ti 2� `� � r 3� � ,;_ �- �cs � � 3 ' . - ' v'� � ��=--. , _.. 3 s3 � ' � �3S g +��'- ` � � _ - � ' � g _ . nr �, 5.0 �!� 1 1 � q� } � W�L� � ��. � . . ... � �._ � J� _ - � . � � � , � � �� - � ' .... .;: ' ..,�,� . ... , �t � � ( Q) M � � � �� _ _ _� � � Cp 43 `\`\ � � � @ ��.\ ' - �_ � �• �♦ D°1-—�-—- � � �, �. �-.--..-..-.- WESTERN � �� KING COUNTY � 5s � �.o 25-Year 24-Hour � � � � -, , m 4�� Precipitation �' � � `" --1 ^-�_ r r' , in Inches ��M"� '�� ,-g� ``�- ,��,' 1!9%��y 2009 Sur�ace 5�ater De�i�b-ianual 3-16 � STORMWATER CONVEYANCEBACKWATER CALCULATIONSHEET (1) (2) (3) (4) (5) (6) (7) (8) (9) (10 (11) (12) (13) Barrel Entrance Entrance Pipe 25 year Pipe Outlet Inlet Barrel Barrel Velocity TW Friction HGL Head Segment Q Length Pipe "n" Elev Elev Area Velocity Head Elev Loss Elev Loss CB to CB cfs ft Size Value feet feet s . feet f s feet feet feet feet feet #EX- #1 3.96 30 12" 0.011 382.07 382.37 0.7854 5.04 0.39 382.20 O.00S4 382.21 0.08 #1 - #2 3.96 230 12" 0.011 382.37 384.67 0.7854 5.04 0.39 383.36 0.0054 383.36 0.08 #2 - #3 3.96 89 12" 0.011 386.30 391.12 0.7854 5.04 0.39 387.50 0.0054 386.11 0.08 #2 - #4 1.45 20 12" 0.011 384.67 385.60 0.7854 1.85 0.05 386.11 0.004 386.11 0.01 (14) (15) (16) (17) (18) (19) (20) (21) Exit Outiet Intet Approach Bend Junction Head Control Control Velocity Head Head HW RIM ELEV Loss Elev Elev Head Loss Loss Elev UPSTREAM feet feet feet feet feet feet feet CB 0.39 382.68 383.75 0.39 0 0 383.36 385.40 OK.� 0.39 383.83 386.50 0.39 0 0 386.11 389.30 OK.� 0.39 386.58 392.00 0.39 0 0 391.61 394.12 OK.� I 0.05 386.18 387.50 0.39 1.3 0 388.41 390.50 OK.� �� ,-� -_, ,_,, -- _, . _ . - -. - - - -- - - � -- __ i d.2.1 PIPE SYS"I'EVIS—.1IE7710DS OF:1:�:-(Ll'S/.S I FIGL'RE 4.2.1.K BEtiD HEAD LOSSES Ih STRUCTLRCS 1 i r-� __ �{� : I ,�=� ;.,1'� i � �} � , 1.2 I . r D I � ! - 1 10 � I y i i i i Y �a _ � � Bend at Manhote;� � � no Special Shaping � m o � c.� y I o Deflector I J 0.6 Curved � � � I I Bend at Manhole, � ICurved or DeFlector I 7 � I 0.4 I Curved Sewer � r/D=2 I � � I 02 i � � Sewer r!D>6 � I I ' 0.0 0� 20� 40� 60� 80� 90° 100° Deflection Angle �;Degrees 2009 Surface Water llesi�n Manual 1t9,�2t109 4-27 ,' �� SGCTION 4.3 CUi.VGRTS AND I3RIDGGS TABLE d.3.l.B ENTRANCE LOSS COEFFICLENTS Type of Structure and Design Entrance Coefficient,li� Pipe,Concrete, PVC,Spiral Rib. DI,and LCPE �` � Projecting from fill,socket(bell)end 0.2 Projecting from fill,square cut end 0.5 Headwall,or headwail and wingwalis Socket end of pipe(graove-end) 0.2 Square-edge 0.5 Rounded(radius=�/,ZD) 0.2 Mitered to conform to fill slope 0.7 End section conforming to fill slope" 0.5 Beveled edges, 33.7°or 45°bevels 0.2 Side-or slope-tapered inlet 0_2 Pipe,or Pipe-Arch,Corruqated Metal and Other Non-Concxete or D.I. Projecting from fill(no headwall) 0.9 i Headwall,or headwall and wingwalls{square-edge) 0.5 Mitered to conform to fill slope(paved or unpaved slope) 0.7 End section conforming to fill slope" 0.5 Beveled edges.33.7°or 45°bevels 02 Side-or s{ope-tapered inlet 0.2 Box. Reinforced Concrete Headwall parallel to embankment(no wingwalls) Square-edged on 3 edges 0.5 Rounded on 3 edges to radius of'J,2 barre�dimension or beveled Q.2 edges on 3 sides Wingwalls at 30°to 75°to barrel Square-edged at crown 0.4 Crown edge rounded to radius of�/,�barrel dimension or bevelsd top 0.2 edge Wingwall at 10°to 25°to barrel Square-edgad at crown •�.5 Wingwalls parallel (extension of sides) - Square-edged at crown 0.7 Side-or slope-tapered inlet 0.2 ' Note: "End section conforming to fiIl slope"are the sections commonty availa6le irom man��facturers. From fimited hydrau/ic tests they are equivalerit in operaiion to a headwaN in both inlet and out/et controf. Some end sections incorAorating a c/osed taper in their design have a supenor hydraulic pe�formance. Ii4r2009 ?009 Sur;ace 4�'ater Dcsi;n M1lanual �-42 Upstream Area contributing into CB #3 ' ' �-.��..�`� J=1 xJ �,�� : , Area J Tiil Forest 0.00 acres Tili Pasture 0.00 acres Tili Grass 0.99 acres `� -� Outwash Forest 0.00 acres , � '} Outwash Pasture 0.00 acres � Outwash Grass 0.00 acres -) Wetland 0.00 acres � 1.83 acres `� Impervious , Total 2.82 acres Scale Factor : 1.00 15-Min Reduced Edit Flow Paths � Time Series: Upstream Area into CB�t3 » Compute Time Series � Modify User Input � File for computed Time Series [.TSF] __. . ._ � ! �" � ,� J�� " .,��-� , � Flow Frequenc�a Analysis -------------------------------------------------------- , Time Series File:upstream area into cb�3. tsf ProjecL Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequencv knalysis------- Flow Rate Rank Tirae of Peak - - Peaks - - Rank keturn Prob (CFS) (CFS} Period 0 .872 6 8i27i01 18 :00 2 .66 1 100. 00 O . y90 Q. 617 8 1i05i02 15 0� 1 .87 2 25.00 0.960 ' 1 . 87 2 12i08i02 17 15 1 . 21 3 10.00 0.900 � .702 � 8i23iO4 14 :30 1 . 05 4 5. 00 0.800 1 . 05 4 ili17iO4 5:00 1 .04 S 3.00 0 .667 , 1 .04 S 10i27i05 10:45 0 . 872 6 2. 00 0 .500 1 .21 3 10i25i06 22 :45 0 .702 7 1 . 30 4.231 � 2.66 1 1i09i08 6 30 0.617 8 1 . 10 0 .091 I , Computed Peaks ' 39 5G 00 0 48C1 . � � � ► � Section 6: Special Reports and Studies Geotechnical Study attached ��:�� ' �i '�� I Robert M. Pride, LLC Consulting Engineer MaY 5, 2oi4 Mr. Kyle Miller KRRV Development P. O. Box 908 Ravensdale,WA 98051 Re: Geotechnical Recommendations Proposed Residences 3518 NE �� Street Renton, Washington Dear Mr. Miller, This report summarizes the results of our site assessment and geologic research on the residential property located on the north side of NE �� Street in Renton. It is understood that four new residences will be constructed on this new lot subdivision. The purpose of this report is to describe existing site and subsoil conditions, and to provide recommendations for disposal of storm water on the subject lots. Geologic mapping by Booth, et al in 200�along with prior investigations in this area were used as references for this report. Site Conditions �� This rectangular property is relatively flat and covers an area of about o.6 acres. There is an existing residence located on the south end of the site on lots i and 2 that will be removed for the new residences. Access to these proposed residences will be provided by a driveway off of�Street. According to geologic mapping for this area of Renton the ; ,� property is underlain by very dense glacial till (Qvt)that consist of fine silty sands and �, sands. I � Test pits were excavated on these lots to document e�sting subsoil and groundwater conditions, and to determine the potential for onsite infiltration. Three test pits encountered similar soil conditions consisting of an upper thin layer of topsoil and silty sands that were underlain by medium dense to dense weathered glacial till deposits consisting of gravelly sands and sandy gravels with silt. Minor seepage was encountered in TH-2 at three feet,but was absent in the other 2 test holes. Summary logs of these test borings are as follows: TH-i Located io feet south of SE corner of house on Lot i - o.o to o.2ft Topsoil — Silty Sand 0.2 to 2.5ft Gravelly Sand; grey brown, moist, medium dense; 2.�to 4.5ft Sandy Gravel; grey, moist, dense; no groundwater encountered; Robert M. Pride, LLC Page 1 13203 Holmes Point Drive NE Kirkland,WA 98034 �� 'i TH-2 Located ne r w r a est p operty line and 3o feet n/o house on Lot 2 o.o to o.2ft Topsoil — Silty Sand 0.2 to 3.oft Gravelly Sand w/ silt; grey, moist, dense; no groundwater seepage; 3.o to 4.5ft Gravelly Sand; grey, moist, dense; minor seepage at 3.o feet; TH-3 Located at south-center side of Lot 4 o.o to o.5ft Topsoil — Silty Sand 0.5 to 2.5ft Sand and Gravel; grey, moist, loose to medium dense; 2.5 to 4.5ft Sandy Gravel with silt; grey, moist, dense; no groundwater seepage; Geotechnical Recommendations Based on the results of our site investigation and evaluation of the subsoil conditions, it is recommended that onsite infiltration be allowed to discharge periodic storm water into the upper 2.5 to 3.o feet of native gravelly sands and sandy gravels. Minor groundwater seepage was encountered in TH-2 at a depth of three feet but the upper granular soils would accept storm water discharge and infiltration. Based on our site investigation and geologic research the upper soils consist of gravelly ' sands and sands that will perform adequately for moderate storm water discharge into these granular sediments. I have classified these upper soils as "medium sand"in accordance with the King County Design Manual — Table 4.5.2. A recommended infiltration rate of 7.5 min/inch may be used for these granular onsite soils. Please call me if there are any questions. Respectfully, ``�t�_�,��.� .-. �' -`_ ' -„ .'� a� �- ;,�' ., � Ti}f''�a.� �,5.� 1 } , •� , - t �•'j�� +t?.�'- �t �)':� . _ . M..Y Y .,. ' ,... ` r ; . ^ - - ----- _. ,. . t-_ ._�-_-_-___ . --- ---' Robert M. Pride, P. E. Principal Geotechnical Engineer " dist: (i) Addressee encl: Drawing No. i rmp: KRRV7thResi Robert M. Pride, LLC Page 2 13203 Holmes Point Drive NE Kirkland, WA 98034 � ! � i ! � -- - - - -°- - -- - _'' � ��._ � ! _. __ �_.. � _ _ � ^ _ i '_ =--__. - � � i 1.F� --- � .,. � t.� ''•, � . _ _ � �� ''�, ,, � � '�� , =f ti ��` � �'; ,:� � P ' i►r � r;j .. ;� �� `O r. \1'� ` �� ') '..� �, �, � -�� :: ,; �� ,:- ' � �"�^�_�. „��'� i t t �� i, { � - � , � , i `� _ � ' ( �I �. �i �. . �. �) � � I VQ�.' � � � � - . �..� � t{< -. .� , .1 .� ',. __, '� } . i� � �� . -� _ - -� i ..... _t_ . } q�:^.� . - �_,'._ . �. � , .. � . � . I� . . . .�� . . ,. � I //� . - � j 1 ; ` � . / `li� '�`,�,,�,Z � ,_ { t �. , �` `� � �� -'�� -- t � 1 it F ---- � ---- � 1 _" ': ; f 1 � , I �__.__ — --- , � - . , + 1 — .� 1 � j �... _ _ ~ `s — '� -�! � t � � �: 7 j `.��"F E �, � F �9�� _ � � I �� ,` �� r, � ' ` � i � � �.� E � __; _.— � _I 4 �fr T� -- �; . NE 7th STR�E� _ ; . SITE PLAN PrQposed Residenees Project�?o. 3518 NE 7th Street Rentor�,Washington Drawzng No. 1 Ro�lert M. Pride LLC Cansulting Geotechnical Engineer Section 7: Other Permits None applicable at this time ��_ Sect�on 8: CSWPPP Analys�s and Des�gn The proposed development and improvements comprise of 0.72 acres of property. The actual exposed and "worked"area on the project will consist of widening NE 7�' Street and installing a private access road along the west side of the property. This��open and worked"construction area will be 0.55 acres. All construction activities will be concentrated on NE 7�' Street. The entire property is NOT proposed to be graded and worked. Erosion control for the project will consist of silt fencing along the westerly edge of the new private road and on any down sloping areas. The existing paved driveway will be used for construction entry. The Developer constructing the improvements on NE 7th North Phase 2 Short is also the same developer that has constructed the NE 7`h (three) short plats on the south side of NE 7"'. The project to the south has been completed and properly protected from erosion. All staging of materials and vehicle parking will be provided off site on the project to the south. Therefore minimizing disturbance on the NE 7�' North Phase 2 property can be accomplished. This will allow for more un-disturbed surface areas to filter and minimize erosion runoff during construction. A temporary pond is not proposed due to allow for minimal disturbance of the property. There is an existing house and crawl space on the property that will be demolished under a separate permit. The crawl space area will provide a localize depression if additional filtration is necessary. This area could be used as a small ponding depression. , ,\�� ,_ I� , _�, ;� � �� 'I _ il � _ �� I ' r i� i Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant A Declaration of Covenant(Operation, maintenance, and restrictions) is attached for the proposed BMP's shown on the civil construction plans. Bond Quantity forms are herein attached to this Section. _� . -� � , ;- � � , ,-�� '. j " 1 � �� i � _-�J ;., _. � � ,_ . 1 Site Improvement Bond Quantity Worksheet S,5 Webdate: 02/22/2013 � King County , Department of Permitting & Environmental Review 35030 SE Dougtas Street, Suite 210 � Snoquaimie, Washington 98065-9266 For alternate formats, cail 206-296-6600. 206-296-6600 TTY Relay 711 Project Name: � .- � � � Date: lD 2� Location: � i Project No.: (�� • �Q)� ��'O�� • Activity No.: (��'j(p�� Note: All prices include labor, equipment, materiais, overhead and Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area , or from local sources if not included in the RS Means database. yes � no If yes, Forest Practice Permit Number: (RCW 76.09) Page 1 of 9 Unit prices updated: 02/12/02 Version: 11/26/2008 li-wks-sbq.xls Report Date: 09/09/2013 Site Improvement Bond Quantity Works�heet S,5 Webdate: 02/22/2013 Unit #o Reference# Price Unit Quanti lications Cost EROSION/SEDIMENT CONTROL Number Backfill&compaction-embankment ESC-1 $ 5.62 CY � , Check dams,4"minus rock ESC-2 SWDM 5.4.6.3 $ 67.51 Each I Crushed surfacin 1 1/4"minus ESC-3 WSDOT 9-03.9(3) $ 85.45 CY ' Ditching ESG-4 $ 8.08 CY Excavation-bulk ESC-5 $ 1.50 CY Fence,silt E5C-6 SWDM 5.4.3.1 $ 1.38 LF Fence,Temporary(NGPE) ESC-7 $ 1.38 LF Hydroseeding ESC-8 SWDM 5.4.2.4 . $ 0.59 SY Jute Mesh � ESC-9 SWDM 5.4.2.2 $ 1.45 SY Mulch, by hand,straw,3"deep ESC-10 SWDM 5.4.2.1 $ 2.01 SY Mulch,by machine,straw,2"deep ESC-11 SWDM 5.4.2.1 $ 0.53 SY Piping,temporary,CPP,6" ESC-12 $ 10.70 LF Pi in ,tem ora , CPP,8" ESC-13 $ 18.10 LF Piping,tem orary, CPP, 12" ESC-14 $ 20.70 LF Plastic covering,6mm thick, sandbagged ESC-15 SWDM 5.4.2.3 $ 2.30 SY Rip Rap,machine laced;slopes ESC-16 WSDOT 9-13.1(2 $ 39.08 CY Rock Construction Entrance,50'x15'x1' ESC-17 SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' ESC-18 SWDM 5.4.4.1 $ 2,928.68 Each Sediment pond riser assembly ESC-18 SWDM 5.4.5.2 $ 1,949.38 Each � Sediment trap,5' high berm ESG20 SWDM 5.4.5.1 $ 17.91 LF Sed.trap,5'hi h,rlprapped spillway berm section ESC-21 SWDM 5.4.5.1 $ 68.54 LF Seeding,by hand ESC-22 SWDM 5.4.2.4 $ 0.51 SY D '� Soddin , 1"deep,'level graund ESC-23 SWDM 5.4.2.5 $ 6.03 SY Sodding, 1"deep,slo ed round ESC-2A SWDM 5.4.2.5 $ 7.45 SY TESC Supenrisor ESC-25 $ 74.75 HR ( '� Water truck, dust control E5C-26 SWDM 5.4.7 $ 97.75 HR WRITE-IN�ITEMS**'""` see a e 9 Each . � � ESC SUBTO7AL: $ - 38°/a CONTINGENCY 8�MOBILIZATION: $ ESC TOTAL: �� - � COLUMN: Page 2 of 9 Unit prices updated: 02/12/02 Version: 11/26/2008 li-wks-sbq.xls Report Date: 09/09/2Q13 Site Improvement Bond Quantity Worksheet Webdate: 12102/20oe Exisdng Future Public PNvate Quantlty Completed Rightof-Way Right of Way Improvements (Bond Reduction)' &Drainage Facitides Quant. Unit Price Unit Quent. Cost Quant. Cost Quant. Cost Com lete Cost GENERALITEMS No Backfill&Com action-embankment GI-1 $ 5.62 CY Backfill&Com actlon-trench GI-2 $ 8.53 CY � Clear/Remove Brush b hand GI-3 $ 0.36 SY Clearin /Grubbin ITree Removai GI-4 $ 8 876.16 Acre Excavation-bulk GI-5 $ 1.50 CY � Excavation-Trench GI-6 $ 4.06 CY Fencin cedar 6'hi h GI-7 a 18.55 LF Fencin chain link,vin coated 6'hi h GI-8 $ 13.44 LF Fenci chain link ate vin I coated 2 GI-9 $ 1 271.81 Each Fencin s lit rail 3'hi h � GI-10 a 12.12 LF Fill&com act-common barrow GI-11 $ 22.57 CY Fill&com act- ravel base GI-12 $ 25.48 CY Fill&com act-screened to soil GI-13 $ 37.85 CY Gabion 12"dee stone filled mesh GI-14 54.31 SY Gabion,18"dee stone fllled mesh GI-15 $ 74.85 SY Gabion 36"dee sione fllled mesh GI-16 $ 132.48 SY Gradin fine b hand GI-17 $ 2.02 •SY � Gradin fine with rader GI-18 $ 0.95 SY Monuments 3'lon GI-19 $ 135.13 Each � Sensitive Areas Si n GI-20 $ 2.88 Each Soddi 1"dee slo ed round GI-21 $ 7.46 SY Surve in Iine& rade Gt-22 $ 788.26 Da Surve in lot IocatloNlines GI-23 $ 1 556.64 Acre � Traffic control crew 2 fla ers GI-24 $ 85.1 B HR Treii 4"chi d wood GI-25 $ 7.59 SY Trail,4"crushed cinder GI-26 $ 8.33 SY Trail 4"to course GI-27 $ 8.19 SY Wall retainin concrete GI-28 $ 44.16 SF Wall,rocke GI-29 $ 9.49 SF � i / �f / Page 3 of 9 SUBTOTAL �� / � Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reductlon. Version: 11/26/08 p-wks.sby.�dg Repo�t Date:09/09/2013 _ i Site Improvement Bond Quantity Worksheet VVe°°a`e: „`°"`°°a Existing Future Publ(c Private Bond Reduction' Right-of-way Right of Way Improvements &Draina a Facilities Quant. Unit Price Unit Quant. Cost Ouant. Cost Quant. Cost Complete Cost ROADIMPRpVEMENT No. AC Grindin 4'wide machine<1000s RI-1 $ 28.00 SY AC Grindin 4'wide machine 1000-200 RI-2 $ 15.00 SY AC Gnndin 4'wide machine>2000s RI-3 $ 7.00 SY AC RemovaUDis osal/Re air RI-4 $ 67.50 SY Berricade, e I RI-5 $ 30.03 LF Barricade o III Permanent RI-6 $ 45.05 LF Curb&Gutter,rol{ed RI-7 $ 17.00 LF Curb&Gutter,vertical RI-8 $ 12.50 LF Curb and Gutter derriolition and dis osa RI-9 $ 18.00 LF Curb extruded as halt RI-10 $ 5.50 LF Curb extruded concrete RI-11 $ 7.00 LF Sawcut as halt 3"de th RI-12 $ 1.85 LF Sawcut concrete er 1"de th � RI-13 $ 1.69 LF Sealant as halt RI-14 $ 1.25 LF Shoulder AC see AC road unit rice RI-15 $ SY Shoulder ravel,4"thick RI-16 $ 15.00 SY Sldewalk 4"thick RI-17 $ 35.00 SY Sidewalk 4"thick demolition and dis os RI-18 $ 29.50 SY Sidewalk 5"thick RI-19 $ 38.50 SY � Sidewalk 5"thick demolitfon and dis os RI-20 $ 37.50 SY Si n handica RI-21 $ 85.28 Each Stri in er stall RI-22 $ 5.82 Each Stri in thermo lastic for croeswalk RI-23 $ 2.38 SF Stri in ,4"reflectorized line RI-24 $ 0.25 LF Page 4 of 9 SUBTO7AL � + � / _�� Unit prices updated: 0?J12/02 "KCC 27A authorizes only one bond reduction. VefsiOn: 11/26/08 li-wks-sbq.xis Report Date:09J09/2013 Site improvement Bond Quantity Worksheet Webda`e: ,Z'°Z,Z°°8 Existing Future Public Private Bond Reduction" Right-of-way Right of Way improvements 8 Draina e Facilities Quant. Unit Price Unit Quanf. Cost Quant. Cost Quant. Cost Com lete Cost ROAD SURFACING (4"Rock=2.5 base&1.5"top course) For'93 KCRS(6.5"Rock=5"base&1.5"top course) For KCRS'93, additiona�2.5"base add RS-1 $ 3.60 SY AC Overla 1.5"AC RS-2 $ 11.25 SY AC Overla 2"AC RS-3 $ 15.00 SY AC Road 2" 4"rock First 2500 SY RS-4 $ 21.00 5Y AC Road,.2" 4"rock Qt .over 2500SY RS-5 19.00 SY AC Road 3" 4"rock,First 2500 SY RS-6 $ 23.30 SY AC Road 3" 4"rock Q .over 2500 SY RS-7 21.00 SY AC Road,5",First 2500 SY RS-8 $ 27.60 SY AC Road 5" Q .Over 2500 SY RS-9 $ 25.00 SY AC Road 6" First 2500 SY S-1 $ 33.10 SY AC Road 6" Q .Over 2500 SY S-1 $ 30.0� SY As haft Treated Base 4"thick RS-1 $ 20.00 SY Gravel Road 4"rock,First 2500 SY S-1 $ 15.00 SY Gravel Road 4"rock (] .over 2500 SY S-1 $ 8.50 SY PCC Road 5" no base,over 2500 SY S-1 $ 27.00 SY PCC Road 6" no base over 2500 SY S-1 25.50 SY 7hickened Ed e S-1 $ 8.60 LF Page 5 of 9 SUBTOTAL � � ' ��/ `�/ Unit prices updated: 02/12/02 *KCC 27A authorizes only one bond reduction. Version: 11/26/08 li-wks-sbq.xls Report Date:09J09/2013 Site Improvement Bond Quantity Worksheet webdate: 1?JOZ2008 Exlating Future Public Private Bond Reduction" Right-of-way Right of Way Improvements 8�Draina e Fecilities Quant. Unit Price Unit Quant Cost Quant. Cost Quant. Cost Com lete Cost DRAINAGE (CPP=Corrugaled Plastic Pipe,N12 or Equivalent) For CulveR rices, Avera e ot4'coverwas assumed.Assume rforeted PVC Is same rice as solid i . Access Road R/D D-1 $ 21.00 SY Bollards-fixed D-2 $ 240.74 Each Bollards-ramovable D-3 $ 452.34 Each * CBs include frame and lid CB T e I D-4 $ 1,257.64 Each CB T e IL Q-5 $ 1 433.59 Each CB T e II,48"diametar D-fi $ 2 033.57 Each for additional de th over 4' D-7 $ 436.52 FT � CB T e II 54"diameter. D-8 $ 2 192.54 Each for additional de th over 4' D-9 $ 486.53 FT CB T e II 60"diameter D-10 $ 2 351.52 Each for additional de th ove�4' D-11 536.54 FT CB T e II 72"diameter D-12 $ 3 212.64 Each for additional de th over 4' D-13 $ 692.21 FT Throu h-curb Inlet Framework Add D-14 366.09 Each Cleanout PVC 4" D-15 $ 130.55 Each Cleanout PVC,6" D-16 $ 174.90 Each Cleanout PVC 8" D-17 $ 224.19 Each Culvert PVC,4" D-18 $ 8.64 LF Culvert,PVC 6" D-19 $ 12.60 LF Culvert,PVC, 8" D-20 13.33 LF Culverl,PVC 12" D-21 $ 21.77 LF Culvert,CMP 8" D-22 $ 17.25 LF Culvert CMP 12" D-23 $ 26.45 LF Culvert CMP 15" D-24 32.73 LF Culvert CMP 18" D-25 $ 37.74 LF Cul�ert,CMP 24" D-26 $ 53.33 LF Culvert CMP 30" D-27 $ 71.45 LF Culvert CMP,36" D-28 $ 112.11 LF Cuivert CMP 48" D-29 $ 140.83 LF Culvert CMP 6Q" D-30 $ 235.45 LF Culvert,CMP,72" D-31 $ 302.58 LF ' Page 6 of 9 SUBTOTAL � ('/ � ��v' Unit prfces updated: 02/12/02 *KCC 27A authonzes only one bond roduction. Version: 11/26/08 ii-wks-sbq.xls Report Date:09/09/2013 � - Site Improvement Bond Quantity Worksheet `"eb°ate: ,y°�,2°°e Existing Future Publlc Private Bond Reduction' Right-of-way Right of Way Improvements DRAINAGE CONTINUED $Dralna e Factlities Quant. No. Unft Price Unft Quant. Cost Quant. Cost Quant. Cost Com lete Cost Culvert,Concrete 8" D-32 $ 21.�2 LF Culvert Concrete 12" D-33 $ 30.05 LF Culvert Concrete 15" D-34 $ 37.34 LF Culvert,Concrete 18" D-35 $ 44.51 lF Culvert Cpncrete,24" D-36 $ 61.07 LF Culvert Concrete 30" D-37 $ 104.18 LF Culvert Concrete 36" D-38 $ 137.63 LF Culvert Concrete 42" D-39 $ 158.42 LF Culvert Concrete 48" D-40 $ 175.94 LF Culvert CPP,6" D-41 $ 1070 I.F Cuivert,CPP,8" D-42 . 16.10 LF Culvert CPP,12" D-43 20.70 LF Culvert CPP 15" D-44 $ 23.00 LF Culvert CPP 18" D-45 $ 27.fi0 LF Culvert CPP 24" D-46 $ 36.80 LF Culvert CPP 30" D-47 $ 48.30 LF Culvert CPP 36" D-48 $ 55.20 LF � Ditchin D-49 $ 8.08 CY Flow Dis ersal Trench 1 436 base+ D-50 $ 25.99 LF French Drain 3'de th D-51 $ 22.60 LF Geotextile lafd in trench ol ro ne D-52 $ 2,40 SY � Inflitration ond tesiin D-53 $ Z4.75 HR Mid-tank Access Riser 48"dia, 6'dee D-54 $ 1 605.40 Each Pond�verfiow S iliwa D-55 14.01 SY RestrictorlOil Se arator 12" D-56 $ 1 045.19 Each RestrictodOii Se arator 15" D-57 $ 1 095.56 Each RestrictorlOil Se arator 18" D-58 $ 1,146.16 Each Ri ra laced D-59 $ 39.08 CY Tank End Reducer 36"diameter D-60 $ 1,000.50 Each Trash Rack 12" D-61 $ 211.97 Eech Trash Rack 15" D-62 $ 237.27 Each Trash Rack 18" D-63 $ 268.89 Each Trash Rack,21" D-64 $ 306.84 Each ,p� `r �' .r Page 7 of 9 SUBTOTAL V Q m Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. Version: 11/26/08 li-wks-sbq.xls Report Date:09/09/2013 Site Improvement Bond Quantity Worksheet wenaa[e: iz�uz�zuu�s Existing Future Public Private Bond Reduction* Right-of-way Right of Way Improvements 8 Dralna e Facilitles Quant. Unit Price Unit Quant. Price Quant. Cost Quant. Cost Complete Cost PARKING LOT S RFACING No. 2"AC 2"to course rock 8 4"borrow PL-1 $ 21.00 SY 2"AC, 1.5" to course&2.5"base cau PL-2 28.00 SY 4"select borrow PL-3 $ 4.55 SY 1.5"to course rock&2.5"base course PL-4 $ 11.41 SY UTILITY POLES&STREET LIGHTING Utility ole relocation costs muat be accom anied b Franchise Utili 's Cost Statement Utilit Pole(s Relocation UP-1 Lum Sum Street Li ht Poles wlLuminaires UP-2 Each WRITE-IN-ITEM Such as detention/water uai' vauits. � WI-1 Each WI-2 SY WI-3 CY WI-4 LF WI-5 FT WI-6 WI-7 WI-8 WI-9 ' w1-to !� .. / .r SUBTOTAL v O d / �/ / SUBTOTAL(SUM ALL PAGES): � � _;�L_ 30%CONTINGENCY&MOBILIZATIONt �1� �� GRANDT07AL: 7' {�� COLUMN: B C �� E Page 8 of 9 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. VefS1011: 11/26l08 Ii-wks-sbq.xls Report Date: 09/09/2013 I Site improvement Bond Quantity Worksheet webdate: 12/02/2008 Original bond com utations prepared by: Name: •� • Date: {� �. ' �� PE Registration Number: � Tel.#: •' � Firm Name: N �. (,/ Address: . ProJect No: ROAD IMPROVEMEN7S&DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND" PUBLIC ROAD 8 DRAINAGE AMOUNT BOND'AMOUNT MAINTENANCE/DEFECT BOND* REQUIRED AT RECORDING OR Stabilization/Erosion Sediment Control(ESC) (A) $ ��D � - TEMPORARY pCCUPANCY""* Existing Right-of-Way Improvements (B) $ ' �'�ja�� - Future Public Right of Way&Drainage Facilities (C) $ �� - � Private Improvements (D) $ y�_ + - i r Calculated Quantity Completed (E) $ d - / . Total Right-of Way and/or Site Restoration Bond'Y"" (A+B) $ 4�, �� - (First$7,500 of bond"shall be cash.) —T � Performance Bond"Amount (A+B+C+D) = TOTAL (� $ ��.'�Q,_��r/ - T x 0.30 $ - OR lOfimmum md;amount'is'$�D. * �--` � (T-E) $ 2�4�°' ( -� ��l�—��'� (�1•`�>�L�l�N C�1 .�. � ��L� Use large�r o l�x �o or (B+C)x Q � Maintenance/Defect Bond"Total �' 0.25= $ %��f"� - (�.�-�) ��,�, NAME OF PERSON PREPARING BOND'REDUCTION: ��'�(.-�.. �� Date: � y�� *NOTE: The word"bond"as used in this document means a ftnanclal guarantee acceptable to King County. ""NOTE: KCC 27A authorizes right ot way and site restoration bonds to be combined when both are required. The restoration requirement shall Include the total cost for all TESC as a minlmum,not a maximum. In addition,corrective work,both on-and off-site needs to be included. Quantit{es shall reflect worse case scenarlos not Just min(mum requirements. For example,If a salmonld stream may be damaged,some estimated costs for restoration needs to be reflected ln thfs amount. The 30%contingency and moblllzatlon costs are computed ln this quantlty. ""*NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount(�or as revised b ma'or deslgn changes. REQUIRED B�ND'AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY QDES Page 9 of 9 Unit prices updated: 02/12/02 Check out the DDES Web site at www.kinsrcountv.pov/permlts . Version: 11/26108 li-wks-sbq.xls Report Date: 09/09/2013 � Section 10: Operation and Maintenance Manual The Operation and Maintenance of the proposed BMP's provided will be included within the Declaration of Covenant within this Section. ;.. ' . , RECORDING REQUESTED BY AND WHEN RECORDED MAIL TO: CITY CLERK'S OFFICE CITY OF RENTON 1055 SOUTH GRADY WAY RENTON, WA 98057 DECLARATION OF COVENANT FOR MAINTENANCE AND INSPECTION OF FLOW CONTROL BMPS Grantor: ,"��' A��'�� !. �NL Grantee:City of Renton Legal Description: � � 1 �i�^ y . �7�W�r'��L� �}{(7�}L14�•7D �� T�%�►�ct'�# AG�D t�l iaG� Ti7 �ttt-C �" T�i��0�-�c� ►�.t VOt.J th� �?!�� f�_�� 1�,�(nJ �r�� V t�h� u�l}'�• Additional Legal(s)on: Assessor's T�Parcel ID#: � t t�� II IN CONSIDERATION of the approved City of Renton(check one of the following) ❑ residentia] building permit, ❑ commercial building permit, ❑ clearing and grading permit, ❑ subdivision permit, or C�short subdivision permit for Application File No. LUA/SWP ��— �p� relating to the / � real property("Property")described above,the Grantor(s),the owner(s)in fee of that Property, hereby covenants(covenant)with City or Renton,a political subdivision of the state of Washington,that he/she(they)will observe,consent to,and abide by the conditions and obligations set forth and described in Paragraphs 1 through 8 below with regard to the Property. Grantor(s)hereby grants(grant), covenants(covenant),and agrees(agree)as follows: ' 1. Grantor(s)or his/her(their)successors in interest and assigns("Owners")shall retain, uphold, ' and protect the stormwater management devices,features,pathways, limits,and restrictions,known as flow control best management practices("BMPs"),shown on the approved Flow Control BMP Site Plan far the Property attached hereto and incorporated herein as Exhibit A. 2. The Owners shall at their own cost,operate,maintain, and keep in good repair,the Property's BMPs as described in the approved Design and Maintenance Details for each BMP attached hereto and incorporated herein as Exhibit B. 3. City or Renton shall provide at least 30 days written notice to the Owners that entry on the Property is planned for the inspection of the BMPs. After the 30 days,the Owners shall allow the City of Renton to enter for the sole purpose of inspecting the BMPs. In lieu of inspection by the City,the Owners may elect to engage a licensed civil engineer registered in the state of Washington who has expertise m dramage to mspect the BMPs and provide a wntten report descnbmg their condrtion. If the engineer option is chosen,the Owners shall provide written notice to the City of Renton within fifteen days of receiving the City's notice of inspection. Within 30 days of giving this notice,the Owners, or the engineer on behalf of the Owners,shall provide the engineer's report to the City of Renton. If the report is not provided in a timely manner as specified above,the City of Renton may inspect the BMPs without further notice. 4. If the City determines from its inspection, or from an engineer's report provided in accordance with Paragraph 3,that maintenance,repair,restoration,and/or mitigation work is required for the BMPs, The City shall notify the Owners of the specific maintenance,repair,restoration,and/or mitigation work (Work)required under RMC 4-6-030. The City shall also set a reasonable dead(ine for completing the Work or providing an engineer's report that verifies completion of the Work. After the deadline has passed,the Owners shall allow the City access to re-inspect the BMPs unless an engineer's report has been provided verifying completion of the Work. If the work is not completed properly within the time frame set by the City,the City may initiate an enforcement action. Failure to properly maintain the BMPs is a violation of RMC 4-6-030 and may subject the Owners to enforcement under the RMC 1-3, including fines and penalties. 5. Apart from performing routine landscape maintenance,the Owners are hereby required to obtain written approval from the City or Renton before performing any alterations or modifications to the BMPs. 6. Any notice or approval required to be given by one party to the other under the provisions of this Declaration of Covenant shall be effective upon personal delivery to the other party,or after three(3) days from the date that the notice or approval is mailed with delivery confirmation to the current address on record with each Party. The parties shall notify each other of any change to their addresses. 7. This Declaration of Covenant is intended to promote the efficient and effective management of surface water drainage on the Property,and it shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This Declaration of Covenant shall run with the land and be binding upon Grantor(s),and Grantor's(s')successors in interest and assigns. 8. This Declaration of Covenant may be terminated by execution of a written agreement by the Owners and the City of Renton that is recorded by King County in its real property records. � IN WITNESS WHEREOF,this Declaration of Covenant for the Maintenance and Inspection of I� Flow Control BMPs is executed this day of , 20 GRANTOR,owner of the Property GRANTOR,owner of the Property STATE OF WASHINGTON ) COLJNTY OF KING )ss. On this day personally appeared before me: ,to me known to be the individual(s)described in and who executed the within and foregoing instrument and acknowledged that they signed the same as their free and voluntary act and deed,for the uses and purposes therein stated. Given under my hand and official seal this day of ,20 Printed name Notary Public in and for the State of Washington, residing at My appointment expires — - ---------------------------� ,.,,,^�T,�V A PORTIDN OF THE NW 1/4,SE 1l4,SECTION 9,TOWNSHIP 23 N.,RANGE 5 EAST,W.M.,CITY OF RENTON,WASHINGTON � � j Ntp '__"'_'_'__ . ��p� N ._._.:-_'_'_' �P��TO�I S�LLp'�11YGOOM� i 8 "_�_�' M�[111711N IqM M� IO � •,•I,:»... T MOMqOE AK.NONIM a�ow�iirn�a'��tr�s w hew —I J rL�ry ••�eu"'m: M YOMWIf CM[ � GW.K�O[1W MO MI ._. f0.1M00.NC 71X tlll� � i�' I � ��,� N .w:��i.ni" ..�w.... � . W I _ �,:' ��,:d�,. j � x , - ; � � lI i � °i T� -T�11 arwK canr nE � z I ,.,� � . j��, � , �..._.:_..:..... � ,_,_ ,,,.,.�,,.., � Z � _ , _ ._., �lr _�,._ s� ,..�,�.�., ��a I�: �j _�w. . ..9.. _, I ..... p � . .. PIERCE PLACE NE_ . 8 _- - _ cec�. + - --- - ____:� � �y.+ ,�—... .. .. ,�._,.�N� �.. ��.,w< �.. . . I f� ---- "-'' - -_-_ '--- --m" �w I � � i � I iC d i �1 j �� io �' � C�" ............._....... I � . ,:��„a.....,�,.R-.,�..,:,��.„ � - .. .�--� �..._.... ....._..... �� i _....__....�.. �.....___.�.....» ..... o mrmn»muanowa 8F1Ml9 ONK�Y � r• ...�.�y -��r�s.;��.�.� �� —�—�-�=--� —L�----- —i — -- --� --f :~�� .._::��, ,..��:.�, � .,..,.. , � � :�,.�e,�.,.�,.,..:��,m�,.�.�,.�,..,..,�._,�.,�,.��W, � , ,�,�,.,�ae,s.,.d�,��.��., aawuor ..+K«��u.�;an�n.,x,a.w�o..a.��.��„a ........�.:��,:a...r..�,.�-..�.,. w.....,.Mm�- �.«..,«, i � . � � ..��..�„��.,....��..�.,.��•..�,...�:m...�,.,...��.,m�.,...�w.�,: MAIQMVY 2.Q00 SOIWlE PFET OF IIi�ERWOl15 SIAiFACE Al1ONF.D ma.,en dl EhCH LOT 011151DE OF 111E ^ `. ROIOW�Y EA9EIIQlf AfiEA L:(;::��". - _ �L,, 5 .�..�� *n�cna•srcr�� n �..,..�^:'� __Y '""ioa • %.AN VIFW OF IIh1F � Nf9 GRAPH/CSCALE �� p � Y4 ?i1i��:::K::.r::�..c:;.:_. -- �...-., ��.,M ww �.� 1 h1ch�JO/wt M ~�• �. �a. ; OFFE ENGINEER5 ,a,� --- NE 7th NORTH PHASE 2 �o�.,nm. ' • �gq32yp�yy,�77sanieuce � � � CITY OF SCOTTDONOGHHOMES,INC. ` rzcNmri,wnst�c,-ron��se _ �u � � REN TON p��p:ap.�,y72 �,�i p,Nv COMPOSITE UTILITV PLAN 8 BMP'S ' COMACf:DARRRILOPPR,P.B. ' ' � �� w, � � �j;�, ��' 3518 NE 7th Straet ' 1S � UTILI �---------------------------------- EXHIBIT"B" �' PERFORATED PIPE CONNECTION MAINTENANCE INSTRUCTIONS This lot contains stormwater management flow control BMP (best management practice) � called a "perforated pipe connection," which was installed to reduce the stormwater runoff impacts of some or all of the impervious surface on your property. A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom, designed to "leak" runoff, conveyed by the pipe, into a gravel filled trench where it can be soaked into the surrounding soil. The connection is intended to provide opportunity for infiltration of any runoff that is being conveyed from an impervious surface (usually a roo� to a local drainage system such as a ditch or roadway pipe system. The size and composition of the perForated pipe connection as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval from the City of Renton. The soil overtop of the perforated portion of the system must not be compacted or covered with impervious materials. �' C.2.11 PERFORATFD PIPE CONNF,CTIO� ❑ TEXT OF INSTRUCTIONS Your property contains a stormwater management flow oontrol BMP (best management practice) called a "perforated pipe connection,"which was installed to reduce the stormwater runoff impacts of some or ali o� the impervious surface on your property. A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom, designed to"leak"runoff,conveyed by the pipe, into a gravel filled trench where it can be soaked into the surrounding soil. The connection is intended to provide opportunity for infiltration of any runoff that is being conveyed from an impervious surface (usually a roof}to a local drainage system such as a ditch or roadway pipe system. The size and composition of the perforated pipe connection as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King County. The soil overtop of the perforated portion of the system must not be compacted or covered with impervious materials. FIGURE C.2.11.A PERFORATID PIPE CON�V�;CTION FOR A SL�TGLE FAMILY RESIDENCE randorn fill \��\/�j.��;��;��j;�;� 6" ��/��/�//��'��/�'��: filter fabric y /�\/�\/%`,,%�\/i��%q L ': � o 0 0 - � „ o � 6"perf pipe 18" min °�°o o 'a°a�o ��I o p � °Q eQ o n 11/z"-3ra"washed rock 0 a oa p��a on �c"� en p o -� � � o , °o� A �'v�O ��°o.. o Gv o�7°�'aGL n�v 0 0 ° � c � o a a � o �24" min� TRENCH X-SECTION NTS slope —� to road drainage system 2'X 10' /level trench w/perf pipe PLAN VIEW OF ROOF NTS 2009 Surface Water Design Manual-AppendiY C 1/9/2009 I C-81 � SECTION C.2 FLOW CONTROL BMPs C.2.3.5 MAINTENANCE INSTRUCTIONS FOR LIMITED INFILTRATION If the limited infiltration flow control BMP is proposed for a project,the following maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.33 (p.G18). The intent ofthese instructions is to explain to future property owners,the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum;DDES may require additional instructions based on site- specific conditions. Also,as the County gains more experience with the maintenance and operation of these BMPs,future updates to the instructions will be posted on King County's Surface Water Design Alanual website. ❑ TEXT OF INSTRUCTIONS Your property contains a stormwater management flow control BMP(best management practice) called "limited infiltration,"which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Limited infiltration is a method of soaking runoff from impervious area(such as paved areas and roofs)into the ground. Infiltration devices, such as gravel filled trenches, drywells, and ground surFace depressions,facilitate this process by putting runoff in direct contact with the soil and holding the runoff long enough to soak most of it into the ground. To be successful,the soil condition around the infiltration device must be able to soak water into the ground for a reasonable number of years. The infil ' n devices used on your property inGude the following as indicated on the flow control BMP site plan: gravel filled trenches, ❑ drywells. The size, placement, and composition of these devices as depicted y the flow control BMP site plan and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King County. Infiltration devices must be inspected annually and after major storm events to identify and repair any physical defects. Maintenance and operation of the system should focus on ensuring the system's viability , by preventing sediment-laden flows from entenng the device. Excessive sedimentation will result in a plugged or non-tunctioning facility. If the infiltration device has a catch basin, sediment accumulation must be removed on a yearly basis or more frequentfy if necessary. Prolonged ponding around or atop a device may indicate a plugged facility. If the device becomes plugged, it must be replaced. Keeping the areas ,, that drain to infiltration devices well swept and Gean will enhance the longevity of these devices. For roofs, frequent cleaning of gutters will reduce sediment loads to these devices. I, I;'9,�2009 2009 Surface�'ater Design Manual—Appendix C C-50 C.2.2 FULL INFILTRATION FIGURE C.2.2.A TYPICAL TRENCH INFILTRATION SYSTEM n �V' —fOOf Z drain PLAN VIEW NTS —a"rigid or 6"fiexible , pertorated pipe , _---------------•-------------•--•---------•;--- � '��l I L� ��.��.�.��.��.....�..�....�.�..�.��.�� infiltration trench �`—sump w/solid!id PLAN VIEW - roof drain NTS � overffow � 4"rigid or 6"flexible splash block� \�.�� r perforated pipe \ � r �� /://i��./��%' �' �i\%j�/j�%��%/��/%�%i��%i�i/��i/`; . _ .-`-- \��\��\ 6"� , --_------•�•-------•-----•-------•------------ - 6 � ;f G� '.� ^� ,,a � t•- Y min 5.0'min ' 12" _. =�' washed rock '-7. _ _ _ ; u., ..i �— ------ ---1-1�n-3/4-----•-'----- --------- ��min fine mesh �- CB sump w/solid lid � crroan varies A filter fabric— —., � � - compacted backfill � i � !; I " / ----_ \ �4t % 4— --- ._ - � 4"ngid or 6"flexible �, 4 �t` perforated pipe 24" ov o ��" %'�'.^ G ',_� �_;: 12„ �% ;�o ��,^o `��`" washed rock � c ° o�-'c 7� 1 1/2"-314" ��j� c°.s7 o r�, i��f��j/��j/��j/\�. /,�./,�/,�./,�.�/ �— 24'=�•- _ SECTION A NTS 2009 Surface Water Design Manual—Appendix C 1/9/2009 C-45 ��< �r J�l , RECORDING REQUESTED BY AND WHEN RECORDED MAIL TO: CITY CLERK'S OFFICE GITY OF RENTON 1055 SOUTH GRADY WAY RENTON, WA 98057 DECLARATION OF COVENANT FOR IMPERVIOUS SURFACE LIMIT Grantor: �'� �� tVAri�7, ��G, Grantee: Ciry of Renton Legal Description:�� . �OL�— � , �� (�� r�F•�. �'�=��f.T�_ �4 C.GOR-�ti Ovl�-�'fL�C� fl.�l" 1C��l��''.dI�D i rs cld�.�w►� ��zt�' � �� ILr � �, C av�-r� . u�.ts�. Additional Legal(s) on: Assessor s Tax Parcel ID#: �� `�L�SS IN CONSIDERATION of the approved City of Renton Gj�_�r permit for application file No. LUAiSV�'P �—��O'�j relating to real property legally described above,the undersigned as Grantor(s); declares(declare)that the above described property is hereby established as having a limit to the amount of impervious surface allowed on the property for the purpose of limiting stormwater flows and is subject to the following restricrions. The Grantor(s)hereby co�Tenants(covenant)and agrees(agree)as follows: no more than 2 0 square feet of impervious surface coverage is allowed on the property. Impervious surface means a hard surface area that either prevents or retards the entry of water into the soil mantle as under natural conditions before development; or that causes water to run off the surface in b eater quantities or at an increased rate of flow from the flow present under natural conditions priar to - development. Common impervious surfaces include,but are not limited to,roof,walkways,patios, r driveways,parking lots, or storage areas,areas that are paved,graveled or made of packed or oiled earthen materials, or other surfaces that similarly impede the natural infiltration of surface and storm _ water. Ciry of Renton or its municipal successors shall have a nonexclusive perpetual access easement on r � the Property in order to ingress and egress over the Property for the sole purposes of inspecting and � monitoring the Property's impervious surface coverage. This easement/restriction is binding upon the Grantor(s),its heirs,successors,and assigns unless or until a new drainage or site plan is reviewed and approved by the Renton Development Services Division or its successor. `:. �I IN WITNESS WHEREOF,this Declaration of Co��enant is executed this day of , 20 GR.ANTOR, o«�ner of the Properry GRANTOR, o«�ner of the Propert� STATE OF WASHINGTON 1 COUNTY OF KING lss. On this day personally appeared before me: � , to ine l:no��n to be the individual(s) descl-ibed in and who executed the within and foregoing instrument and acknowledged that they si�ned the same as their free and voluntary act and deed,for the uses and purposes therein stated. Given under my hand and official seal this day of ,20 Printed name Notary Public in and for the State of Washington, residing at i�Iy appoinhnent expires