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Home My WebLink AboutERC_Determination_Applicant_Ltr_38th St Short Plat_190621 June 21, 2019 Silvija Jakovljevic Medici Architects 11700 SE 8th St, Unit 100 Bellevue, WA 98005 SUBJECT: ENVIRONMENTAL THRESHOLD (SEPA) DETERMINATION 38th Street Short Plat, LUA18-000683, SHPL-A ECF, MOD Dear Ms Jakovljevic: This letter is written on behalf of the Environmental Review Committee (ERC) to advise you that they have completed their review of the subject project and have issued a threshold Determination of Non-Significance- Mitigated with Mitigation Measures. Please refer to the enclosed ERC Report, for a list of the Mitigation Measures. Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on July 5, 2019, together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed by RMC 4-8-110 and more information regarding the appeal process may be obtained from the Renton City Clerk’s Office, (425) 430-6510. If the Environmental Determination is appealed, a public hearing date will be set and all parties notified. If you have any questions or desire clarification of the above, please call me at (425) 430-6598. For the Environmental Review Committee, Jill Ding Senior Planner Enclosure cc: Sapphire LLC / Owner(s) Emily Buchwalter/Applicant Akutagawa, Donnell, Crompton, Davis, Paskett / Parties of Record DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Project Location Map ERC_Report_38th Street Short Plat_FINAL ENVIRONMENTAL REVIEW COMMITTEE REPORT ERC Meeting Date: June 17, 2019 Project File Number: PR18-000554 Project Name: 38th Street Short Plat Land Use File Number: LUA18-000683, SHPL-A, ECF, MOD Project Manager: Jill Ding, Senior Planner Owner: Sapphire, LLC, 331 NW 78th St, Seattle, WA 98117 Applicant: Emily Buchwalter, Medici Architects, 11661 SE 1st St, Ste 200, Bellevue, WA 98005 Contact: Silvija Jakovljevic, Medici Architects, 11661 SE 1st St, Ste 200, Bellevue, WA 98005 Project Location: 1825 NE 38th St, Renton, WA 98056 Project Summary: The applicant is requesting Preliminary Short Plat approval, Environmental (SEPA) Review, and a street Modification for the subdivision of an existing 62,781 square foot project site zoned R-8, into 8 lots and 2 tracts (shared driveway/alley and native growth protection area). An existing single-family residence is proposed for removal. The proposed lots would range in size from 5,000 square feet to 6,522 square feet. Access to the proposed lots would be provided via a shared driveway/alley off of NE 38th Street. Half street improvements, including paving, curb and gutter, landscaping with street trees, and sidewalk would be provided along the site's Lincoln Ave NE and NE 38th Street frontages. The site is mapped with erosion hazard areas, landslide hazard areas, sensitive slopes, and protected slopes. The applicant is proposing to retain 17 of the existing 102 significant trees located on the project site. A Modification to the City's adopted street standards has been requested for the portion of N 38th Street to the west of the proposed private access driveway. The applicant is requesting to waive the frontage improvements along the steep slopes and to limit the frontage improvements to a sidewalk, parking area, and landscaped courtyard over the proposed stormwater vault. Exist. Bldg. Area SF: N/A Proposed New Bldg. Area (footprint): Proposed New Bldg. Area (gross): N/A N/A Site Area: 62,781 sq. ft. Total Building Area GSF: N/A STAFF RECOMMENDATION: Staff Recommends that the Environmental Review Committee issue a Determination of Non-Significance- Mitigated (DNS-M). DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C City of Renton Department of Community & Economic Development 38th Street Short Plat Staff Report to the Environmental Review Committee LUA18-000683, SHPL-A, ECF, MOD Report of June 17, 2019 Page 2 of 3 ERC_Report_38th Street Short Plat_FINAL ENVIRONMENTAL REVIEW In compliance with RCW 43.21C.240, the following environmental (SEPA) review addresses only those project impacts that are not adequately addressed under existing development standards and environmental regulations. A. Environmental Threshold Recommendation Based on analysis of probable impacts from the proposal, staff recommends that the Responsible Officials: Issue a DNS-M with a 14-day Appeal Period. B. Mitigation Measures 1. Project construction shall comply with the recommendations outlined in the Geotechnical Engineering Report, prepared by ZipperGeo, dated October 12, 2018. 2. A 25-foot buffer and additional 15-foot building setback shall be required from the top edge of the protected slope area. C. Exhibits Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Colored Site Plan Exhibit 3: Colored Landscape Plan Exhibit 4: Preliminary Short Plat Map Exhibit 5: Geotechnical Engineering Report, prepared by ZipperGeo, and dated October 12, 2018 Exhibit 6: Advisory Notes D. Environmental Impacts The Proposal was circulated and reviewed by various City Departments and Divisions to determine whether the applicant has adequately identified and addressed environmental impacts anticipated to occur in conjunction with the proposed development. Staff reviewers have identified that the proposal is likely to have the following probable impacts: 1. Earth Impacts: The project site is mapped with erosion hazard areas, landslide hazard areas, sensitive slopes, and protected slopes. The applicant submitted a Geotechnical Engineering Report (Exhibit 5), prepared by ZipperGeo, and dated October 12, 2018. According to the submitted report, the topography of the site slopes moderately down to the west to the top of a protected slope. The total vertical relief of the property occurs between the southeast and northwest property boundaries and is about 58 feet. Vegetation on the site generally consists of deciduous and coniferous trees and brush with areas of ornamental landscaping. Published maps indicate that the project site is underlain by Vashon Till, which is a non-sorted mixture of clay, silt, sand, pebbles, cobbles, and boulders in variable amounts. Subsurface conditions were evaluated through the completion of 2 test borings (B-1 and B-2) on the project site. Boring B-1 was conducted on the southeastern portion of the project site and boring B-2 was conducted on the southwestern portion of the project site. Both borings were advanced to a depth of about 41.5 feet below grade. Surficial soils conditions observed in the borings generally consisted of about 6 to 8 inches of forest duff and topsoil. Below the forest duff and topsoil, soil conditions observed in borings generally consisted of about 7 to 10 feet of loose to medium dense sand and silt. Below the loose to medium dense sand and silt, soil conditions observed in the borings generally consisted of medium dense to very dense sand and very stiff to hard silt to the completion depths of about 41.5 feet below existing site grade. The medium dense to very dense sand and very stiff to hard silts observed in DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C City of Renton Department of Community & Economic Development 38th Street Short Plat Staff Report to the Environmental Review Committee LUA18-000683, SHPL-A, ECF, MOD Report of June 17, 2019 Page 3 of 3 ERC_Report_38th Street Short Plat_FINAL the borings is interpreted to be glacial till. Perched groundwater was encountered at a depth of about 15 feet in both borings. The submitted geotechnical report recommends a 25-foot buffer with an additional 15-foot building setback from the edge of the protected slope area. In addition, it is recommended that earthwork activities be conducted during the drier summer months (May 1-September 30). The report also includes recommendations for site preparation, structural fill materials and preparation, underground utilities, temporary and permanent slopes, residential building foundations, permanent foundation retaining walls, site retaining walls, rockeries, MSE and gravity block walls, stormwater infiltration feasibility, stormwater detention vault, on-grade concrete slabs, and permanent drainage. Staff recommends, as SEPA mitigation that the above mitigation recommended in the submitted Geotechnical Engineering Report (Exhibit 5) be required during project construction. Mitigation Measures: 1. Project construction shall comply with the recommendations outlined in the Geotechnical Engineering Report, prepared by ZipperGeo, dated October 12, 2018. 2. A 25-foot buffer and additional 15-foot building setback shall be required from the top edge of the protected slope area. Nexus: SEPA Environmental Regulations, Critical Areas Regulations – RMC 4-3-050 E. Comments of Reviewing Departments The proposal has been circulated to City Department and Division Reviewers. Where applicable, their comments have been incorporated into the text of this report and/or “Advisory Notes to Applicant.”  Copies of all Review Comments are contained in the Official File and may be attached to this report. The Environmental Determination decision will become final if the decision is not appealed within the 14-day appeal period (RCW 43.21.C.075(3); WAC 197-11-680). Environmental Determination Appeal Process: Appeals of the environmental determination must be filed in writing together with the required fee to: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057, on or before 5:00 p.m. on July 5, 2019. RMC 4-8-110 governs appeals to the Hearing Examiner and additional information regarding the appeal process may be obtained from the City Clerk’s Office, Renton City Hall – 7th Floor, (425) 430-6510. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C CITY OF RENTON DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE EXHIBITS Project Name: 38th Street Short Plat Land Use File Number: LUA18-000683, SHPL-A, ECF, MOD Date of Meeting June 17, 2019 Staff Contact Jill Ding Senior Planner Project Contact/Applicant Silvija Jakovljevic Medici Architects 11661 SE 1st St, Ste 200, Bellevue, WA 98005 Project Location 1825 NE 38th St, Renton, WA 98056 The following exhibits are included with the ERC Report: Exhibit 1: Environmental Review Committee (ERC) Report Exhibit 2: Colored Site Plan Exhibit 3: Colored Landscape Plan Exhibit 4: Preliminary Short Plat Map Exhibit 5: Geotechnical Engineering Report, prepared by ZipperGeo, and dated October 12, 2018 Exhibit 6: Advisory Notes DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C TREE #1216 LOD 7'-0" TREE #936 LOD 11'-0"TREE #935 LOD 9'-0" TREE #934 LOD 6'-0" TREE #933 LOD 9'-0" TREE #932 LOD 9'-0" TREE #929 LOD 7'-0" TREE #1036 LOD 6'-0" TREE #1037 LOD 6'-0" TREE #1038 LOD 6'-0" TREE #1039 LOD 6'-0" TREE #1040 LOD 15'-0" TREE #1077 LOD 11'-0" TREE #1068 LOD 6'-0" TREE #1073 LOD 6'-0" TREE #1058 LOD 8'-0" TREE #1053 LOD 11'-0" TREE #1052 LOD 6'-0" TREE #997 LOD 13'-0" TREE #1004 LOD 6'-0"13'-812"TREES #1080-1093TREE #1110 LOD 13'-0" TREE #1066 NON-VAIBLE TREE #1099 NON-VAIBLE TREE #1069 TREE #1100 TREE #1101 26'-0" 45 6 WALKWAY FG 176'LINCOLN AVE NE5' SIDEWALK8' PLANTER STRIP15 FEET BUILDING SETBACK 25 FEET BUFFER SHARED DRIVEWAY N-SNE 38TH STREET DEAD END STREET 5' SIDEWALK CRITICAL AREA 890 SF 8' LANDSCAPE STRIP IN TRACT20'-0"8' PLANTER 170' FG154' FG 176' FG 180' FG 170' FG 172'FG 184' FG 188' MAIN FFE 163' 176' FG 154' FG 153' FG 146'FG 146' FG 152' FG 146' FG 164' FG 164'PLANTERFG 158'FG 164' FG 170' FG 166' FG 170' FG 166'FG 167' FG154' FG 160' SHARED DRIVEWAY E-W PLANTERFG 156'FG 185'FG 162.5 4' GRAVITY WALL 15 FEET BUILDING SETBACK 62'-6"62'-5"15'-0"FRONTYARD15'-0" FRONT YARD5'-0"SIDE15'-0" FRONT YARD 24'-0" R2 5 ' - 0 "15'-0"FRONTYARD20'-0"FRONTYARD20'-0"FRONTYARD5'-0"SIDEYARD20'-0"REARYARD20'-0" REAR YARD 15'-0" FRONT YARD 20'-0" REAR YARD 5'-0" SIDE YARD 5'-0"SIDEYARD18'-0"REARYARD10%reduction13'-5" FRONT YARD 10% reduction 15'-0" FRONT YARD30'-0"20'-0"REPAVEMENT60'-0" ROWR25'-0"5'-0"SIDE20'-0"REARYARD5'-0" SIDE 5'-0" SIDE 5'-0" SIDE 5'-0" SIDE 5'-0" SIDE 5'-0" SIDE R 2 5 ' - 0 " R25'-0"R25'-0"62'-1012"R25'-0" R 2 5 ' - 0 "8'-0"STEPSEXISITING EDGE OF PAVEMENT FG 150' FG 160' FG 168' FG 152' FG 146.5'FG 143'FG 152.5' FG 149' 80'-0" 67'-6"58'-0"61'-8"80'-11"80'-0"69'-5"66'-0"93'-3"82'-9"1 MAIN ENTRY FFE 167.5' GARAGE FFE 153.0'5'-0"SIDE2 MAIN ENTRY FFE 176.5' GARAGE FFE 162.0' 3 MAIN ENTRY FFE 185.5' GARAGE FFE 171.0'5'-0"SIDE25'-0" BUFFER 15'-0" BUILDING SETBACK 26'-3" 22'-9" 26'-3" FG 168'6'-0"FG 165'FG 161' FG 160'FG 154' FG 158' FG156' FG 176' 182' FG 158' + 4'-0" TOW BOW EL A T R O W FG 160' FG 152' FG 160' 176' 184' 186' 190' 180' 11% 9% 11%FG 143'FG 143'FG 144'FG 148'TREE #1039 LOD 6'-0" TREE #1040 LOD 15'-0" TREE #936 LOD 11'-0" TREE #932 LOD 9'-0" TREE #1216 LOD 7'-0" TREE #1053 LOD 11'-0" TREE #935 LOD 9'-0" TREE #934 LOD 6'-0" TREE #1036 LOD 6'-0" TREE #933 LOD 9'-0" TREE #929 LOD 7'-0" TREE #1004 LOD 6'-0" TREE #997 LOD 13'-0"13'-812"TREE #1037 LOD 6'-0" TREE #1038 LOD 6'-0" TREES #1080-1093 TREE #1066 NON-VAIBLE TREE #1110 LOD 13'-0"TREE #1077 LOD 11'-0" TREE #1069 TREE #1100 TREE #1068 LOD 6'-0" TREE #1073 LOD 6'-0" TREE #1058 LOD 8'-0" TREE #1101 TREE #1052 LOD 6'-0" TREE #1099 NON-VAIBLE MAIN FFE 156'MAIN FFE 152' 8 7 MAIN/GARAGE FFE 152'MAIN/GARAGE FFE 149'STEPSSTEPSPORCH PORCHPORCH PORCH PORCH PORCHPORCHPORCHSTEPSSTEPSTOW EL. A T R O W E L . TOW EL. A T R O W E L . TOW EL. A T R O W E L . TREES #1011-1013 LOD 6'-0" 8' LANDSCAPE STRIP IN TRACT TREES TO REMAIN, TYP LLA AREA 2 - 80 SF EXISITING EDGE OF PAVEMENT 2 FEET ROW DEDICATION 415 SF ' GARAGE FFE 152.5' GARAGE FFE 145.5' GARAGE FFE 141.5' 5' SIDEWALK GRASS CRETE MAINTENENCE RD 9'x20' VISITOR PS 9'x20' VISITOR PSVAULT PER CIVIL PLANS WOOD FENCE RETAINING WALL 6' MAX HEIGHT, TYP SITE PLAN A0.0 PARCEL LOCATION VICINITY MAP NTS EB ST, SJ PROJECT No.: DATE: Drawn By: Owner Approval: Checked By: JOB ADDRESS: PROJECT / CLIENT: REVISIONS:DATE: This drawing is the exclusive property of Medici Architects, and can be reproduced only with the permission of the Architect. Variations and modifications to work shown on this drawing shall not be carried out without written permission from the Architect. PLOT SCALE: 1:1 DRAWING NAME: PHASE: REGISTRATION: 1. 2. 3. 4. 5. SITE PLANNING 2018 004 05-06-19 APPROVED FOR CONSTRUCTION: INTAKE:DATE: 38TH STREET SHORT PLAT 1825 NE 38TH STREET RENTON, WA PIN# 334570-0220 KP DEVELOPMENT GROUP 338 NW 77TH STREET SEATTLE, WA 98117PROJECT INFORMATION DESCRIPTION: DEMOLISH EXISTING SFR, PURSUE SHORT PLAT TO ACHIEVE EIGHT (8) LOTS ADDRESS: 1825 NE 38TH STREET, RENTON 98056 PARCEL # 334570-0220 LOT SIZE: 62,781 SF/ ACRES: 1.44 ZONE: R - 8 MIN. LOT SIZE 5,000 SF MIN. LOT WIDTH: 50'/60' MIN. LOT DEPTH: 80' MAX. DENSITY: 8 DU/ac SETBACK: FRONT - 20' (15') SIDE - 5' MIN REAR - 20' BUILDING COVERAGE 50% IMPERVIOUS SURFACE AREA 65% MAX NUMBER OF STORIES: 2 MAX WALL PLATE HEIGHT: 24' SITE PLAN SCALE 1" = 20'-0" N LOT SIZE LOT SIZE PER SURVEY 62,788 SF LLA AREAS TO SUBTRACT 2,367 SF ROW DEDICATIONS 1,350 SF GROSS AREA OF PROPERTY 59,071 SF LOT 1 - CORRNER LOT 5,000 SF LOT 2 5,005 SF LOT 3 5,000 SF LOT 4 - CORRNER LOT 5,000 SF LOT 5 5,027 SF LOT 6 - CORRNER LOT 6,153 SF LOT 7 5,089 SF LOT 8 6,522 SF PROJECT TEAM: OWNER: KP DEVELOPMENT GROUP CAMERON DAMSKOV 331 NW 78TH STREET SEATTLE, WA E: cameron@damskovconstruction.com ARCHITECT: MEDICI ARCHITECTS EMILY BUCHWALTER, AIA 11661 SE 1ST ST., SUITE 200 BELLEVUE, WA 98005 P: 425-453-9298 F: 425-452-8448 E: emily@mediciarchitects.com 1825 NE 38TH STREET, RENTON CIVIL ENGINEER: PREFERRED ENGINEERING, LLC STEVE LEE, PE 11627 SE 58TH STREET BELLEVUE, WA 98006 P: 206-501-5708 E: steve@pellc.org GEOTECHNICAL ENGINEER: ZIPPER GEO, INC ROBERT A.ROSS, PE 19019 36TH AVENUE WEST, SUITE E LYNWOOD, WA 98036 P: 425-582-9928 E: rross@zippergeo.com LANDSCAPE: JGM LANDSCAPE ARCHITECTS CRAIG LEWIS 12610 NE 104TH ST. KIRKLAND WA 98033 P: 425-454-5723 E: jgm@jgm-inc.com SURVEYOR: EASTSIDE CONSULTANTS, INC ROBERT BOGDON 1320 NW MALL ST., SUITE B ISSAQUAH, WA 98027 P: 425-392-5351 E: RBogdon@eastsideconsultants.com ARBORIST: AMERICAN FOREST MANAGEMENT MICHAEL TOMCO 11415 NE 128TH ST., SUITE 110 KIRKLAND, WA 98034 P: 425-820-3420 E: Michael.Tomco@AFMforest.com PARCEL LOCATION QT SEC MAP NTS N N LINCOLN AVE NE 38TH QUIRED STN EXHIBIT 2 RECEIVED 05/06/2019 jding PLANNING DIVISION DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C TREE #1216LOD 7'-0"TREE #936LOD 11'-0"TREE #935LOD 9'-0"TREE #934LOD 6'-0"TREE #933LOD 9'-0"TREE #932LOD 9'-0"TREE #929LOD 7'-0"TREE #1036LOD 6'-0"TREE #1037LOD 6'-0"TREE #1038LOD 6'-0"TREE #1039LOD 6'-0"TREE #1040LOD 15'-0"TREE #1077LOD 11'-0"TREE #1068LOD 6'-0"TREE #1073LOD 6'-0"TREE #1058LOD 8'-0"TREE #1053LOD 11'-0"TREE #1052LOD 6'-0"TREE #997LOD 13'-0"TREE #1004LOD 6'-0"13'-812"TREES #1080-1093TREE #1110LOD 13'-0"TREE #1066NON-VAIBLETREE #1099NON-VAIBLETREE #1069TREE #1100TREE #1101LINCOLN AVE NE 5' SIDEWALK 8' PLANTER STRIP 15 FEETBUILDINGSETBACK25 FEETBUFFERVAULT PER CIVIL PLANSSHARED DRIVEWAY N-S NE 38TH STREETDEAD END STREET5' SIDEWALKCRITICALAREA890 SF8' LANDSCAPE STRIPIN TRACT8' PLANTER170' FG154'180'PLANTER FG 158' FG 165'FG 170'FG 166'EG186'18'-0"EG139'FG 144'SHARED DRIVEWAY E-WPLANTER FG 160' PLANTER FG 156'4' GRAVITYWALL15 FEETBUILDINGSETBACKR25'-0"R25' -0 " 20'-0" REAR YARD R25'-0"R25' -0 "R2 5 ' - 0 "R25' -0 "R25'-0"LLA AREA 1 - 2,285 SFLLA AREA 2 - 80 SFEXISITING EDGE OFPAVEMENT2 FEET ROWDEDICATION 415 SFEXISITING EDGE OFPAVEMENTFG 150'FG 160'FG 168'FG 152.5'PLANT SCHEDULE:TREE REPLACEMENT TOTALS:ABCDEFEEEECEEFFFFFBBBBAAAAACCCCCCDDDDDDDACAACCATREE #936LOD 11'-0"GARAGEFFE162'MAIN FLOORFFE 174'MAIN FLOORFFE 164'ENTRYPORCHFFE 167.5'DAYLIGHTBASEMENTFFE 173.5'ENTRYPORCHFFE 185.5'WALKWAYWALKWAYWALKWAYFG 178'5' SIDEWALK 8' PLANTER STRIP DAYLIGHTBASEMENTFFE 164.5'5' SIDEWALK8' PLANTER FG154'FG 177'FG 180'FG 170'FG 182'FG 172'FG 184'FG 188'180'ENTRYPORCHFFE 176.5'FG 164'FG 164'GARAGEFFE152'GARAGEFFE171'MAIN FLOORFFE 183'FG 164'FG 170'FG 176'FG 166'EG 189.5'FG 170'FG 166'FG 167' FG154'FG 160'FG 166'FG 160'FG 185'MAIN FLOORFFE 152'ENTRYPORCHFFE 151.5'GARAGEFFE 154.5'GARAGEFFE 141.5'MAIN FLOORFFE 152'PATIOFG 148.5'STEPS STEPSFG 150'GARAGEFFE 152'FG 161'5' SIDEWALKMAIN FLOORFFE 149'ENTRY PORCHFFE 160.5'MAIN FLOORFFE 155.5'FG 145.5'FG 139'MAIN FLOORFFE 165'FG 160'FG 165' FG154'158'FG154'FG 153'FG146'FG146'FG152'FG 146'ENTRYPORCHFFE 144.5'STEPSGARAGEFFE 146'ENTRYPORCHFFE 147.5'FG 145'FG 143'FG 145.5'GARAGEFFE 149'FG 144'FG 143'FG 144'FG 148'FG 144'FG 144'FG 143'FG 144'FG 151'LANDSCAPE AREAFG 162.5PATIOFG 155.0PATIOFG 150PATIOFG 151.5'4' GRAVITY WALLTREES#1011-1013LOD 6'-0"DEDCBDDCSTEPS STEPS STEPS PLANTING PLANL1.0SCALE 1" = 20'-0"NINCORPORATED P.S.12610 NE 104TH ST.KIRKLAND WA 98033SITE PLANNINGPARKS ANDURBAN DESIGNRECREATION PLANNINGLANDSCAPE ARCHITECTUREE-: jgm@jgm-inc.comFX: 425.822.3525 PH: 425.454.5723 JGM1825 N.E. 38TH ST.RENTON, WALINCOLN AVE NW NE 38TH STNEXHIBIT 3RECEIVED05/06/2019 jdingPLANNING DIVISIONDocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C EXHIBIT 4 RECEIVED 11/19/2018 jding PLANNING DIVISION DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C GEOTECHNICAL ENGINEERING REPORT Proposed 38th Street Short Plat 1825 NE 38th Street Renton, Washington Project No. 2002.01 October 12, 2018 Prepared for: KP Development Prepared by: Entire Document Available in Laserfiche Submittals Folder EXHIBIT 5 RECEIVED 11/19/2018 jding PLANNING DIVISION DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT Page 1 of 2 LUA18-000683 ADVISORY NOTES TO APPLICANT The following notes are supplemental information provided in conjunction with the administrative land use action. Because these notes are provided as information only, they are not subject to the appeal process for the land use action. Planning: (Contact: Jill Ding, 425-430-6598, jding@rentonwa.gov) 1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless otherwise approved by the Development Services Division. 2. Commercial, multi-family, new single family and other nonresidential construction activities shall be restricted to the hours between seven o’clock (7:00) a.m. and eight o’clock (8:00) p.m., Monday through Friday. Work on Saturdays shall be restricted to the hours between nine o’clock (9:00) a.m. and eight o’clock (8:00) p.m. No work shall be permitted on Sundays. 3. Within thirty (30) days of completion of grading work, the applicant shall hydroseed or plant an appropriate ground cover over any portion of the site that is graded or cleared of vegetation and where no further construction work will occur within ninety (90) days. Alternative 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 1st and March 31st of each year. The Development Services Division’s approval of this work is required prior to final inspection and approval of the permit. 4. A National Permit Discharge Elimination System (NPDES) permit is required when more than one acre is being cleared. 5. The applicant may not fill, excavate, stack or store any equipment, dispose 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 tree to be retained. 6. The applicant shall erect and maintain six foot (6') high chain link temporary construction fencing around the drip lines of all retained trees, or along the perimeter of a stand of retained trees. Placards shall be placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected Trees” or on each side of the fencing if less than fifty feet (50'). Site access to individually protected trees or groups of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In addition, the applicant shall provide supervision whenever equipment or trucks are moving near trees. 7. This permit is shall comply with the Bald and Golden Eagle Protection Act. The permitted is responsible for adhering to the U.S. Fish and Wildlife Service National Bald Eagle Management Guidelines (2007) and /or your U.S. Fish and Wildlife Service permit. Development Engineering: (Contact: Jonathan Chavez, 425-430-7288, jchavez@rentonwa.gov) 1. See Attached Development Engineering Memo dated June 6, 2019. Fire Authority: (Contact: Corey Thomas, 425-430-7024, cthomas@rentonwa.gov) 1. The fire impact fees are currently applicable at the rate of $829.77 per single family unit. This fee is paid at building permit issuance. Credit will be granted for the existing home that is planned to be removed. EXHIBIT 6 DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C ADVISORY NOTES TO APPLICANT Page 2 of 2 LUA**-000*** 2. The fire flow requirement for a single family home is 1,000 gpm minimum for dwellings up to 3,600 square feet (including garage and basements). If the 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 existing fire hydrants are not within 300 feet of all of the proposed new lots. A minimum of one new hydrant will be required. 3. 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 30-ton vehicle with 75-psi point loading. Access is required within 150-feet of all points on all the buildings. Dead end streets that exceed 150-feet in length require an approved hammerhead type turnaround. Maximum roadway grade allowed is 15 percent. Technical Services: (Contact: Amanda Askren, 425-430-7369, aaskren@rentonwa.gov) 1. No comments at this time. Community Services: (Contact: Leslie Betlach, 425-430-6619, lbetlach@rentonwa.gov) 1. Parks Impact fee applies. Police: (Contact: Cyndie Parks, 425-430-7521, cparks@rentonwa.gov) 1. No comments at this time. Building: (Contact: Craig Burnell, 425-430-7290, cburnell@rentonwa.gov) 1. No comments at this time. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT M E M O R A N D U M DATE:June 6, 2019 TO:Jill Ding, Senior Planner FROM:Jonathan Chavez, Civil Engineer III SUBJECT:LUA-Application Comments for 38th Street Short Plat LUA18-000683 I have reviewed the Land Use Application submittal for the 38th Street Short Plat at 1825 NE 38th Street (KC Parcel ID: 3345700220). The applicant is proposing to subdivide the existing lot into 8 lots for single family homes. The existing home is proposed to be removed. EXISTING CONDITIONS The Site is approximately 1.46 acres in size and is trapezoidal in shape. The existing site is developed with an existing single family residence and a large amount of trees located throughout the parcel. Water Water service is provided by the City of Renton. The site is in the Kennydale water service area in the 320’ hydraulic pressure zone. The approximate static water pressure is 71 psi at an elevation of 155’. Static water pressure varies based on topography. There is an existing 12” water main east of the site in Lincoln Avenue NE that can provide 2,500 gallons per minute (gpm). Reference COR Project File WTR2700400 in COR Maps for record drawings. Sewer Sewer service is provided by the City of Renton. There is an existing 8” sewer east of the site along the western frontage of Lincoln Avenue NE that flows from south to north. Reference COR Project File WTR2703908 and WWP2702843 in COR Maps for record drawings. Storm The site contains an existing single family home surrounded by wooded area. There is no mapped on-site conveyance system. The current site topography appears to drain the runoff from the site to the northwest. The site and offsite areas to the northwest contain moderate and high landslide hazards, high erosion hazard areas, and regulated slopes up to a 90% grade. There is a 12” public storm drain east of the site along the eastern frontage of Lincoln Avenue NE that flows from south to north. There is also an existing stormwater conveyance swale north of the site in NE 38th Street that flows from east to west. Streets The proposed development fronts Lincoln Ave NE along the east property line. Lincoln Ave NE is classified as a Residential Access street. Existing right-of-way (ROW) width is approximately 60 feet. The proposed development fronts NE 38th Street along the north property line. NE 38th Street is classified as a Residential Access street. Existing right-of- way (ROW) width is approximately 60 feet. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 2 of 7 June 6, 2019 CODE REQUIREMENTS WATER 1. A minimum of 8” diameter water main extension will be required in NE 38th Street and all private alleys in the development. The new 8” water mains should connect to the existing 12” water main in Lincoln Avenue NE. The new water main(s) shall extend to the southern boundary of the proposed subdivision. a. A 15-foot utility easement will be required for the new water main(s), hydrants and water meters within the property. 2. Below is a summary of the existing fire hydrants in the vicinity of the site. Installation of additional fire hydrants and/or modification of existing fire hydrants may be required by the Renton Regional Fire Authority (RRFA) to meet development standards. a. At the northwest corner of the intersection of Lincoln Avenue NE and NE 38th Street (HYD-NE-01075). b. Along the western frontage of Lincoln Avenue NE approximately 110’ south of the site. 3. The new lots shall be served by a new 1” water service with a 3/4" or 1” water meter. A 1” meter is required if the new home contains a fire sprinkler system. The sizing of the meter(s) shall be in accordance with the most recent edition of the Uniform Plumbing Code. 4. A backflow prevention assembly shall be installed on private property behind the domestic water meter. A double check valve assembly (DCVA) is required for water meters for residential water use. DCVA’s that are 2-inches or smaller shall be installed in a meter box. 5. A pressure reducing valve is required downstream of the meter if the water pressure exceeds 80 psi. 6. If irrigation is proposed for the common areas, a landscape irrigation meter and double check valve assembly is required (DCVA). 7. Civil Construction plans for the water main improvements will be required and must be prepared by a professional engineer registered in the State of Washington. Please refer to City of Renton General Design and Construction Standards for Water Main Extensions as shown in Appendix J of the City’s 2012 Water System Plan. Adequate horizontal and vertical separations between the new water main and other utilities (storm sewer pipes and vaults, sanitary sewer, power, gas, electrical) shall be provided for the operation and maintenance of the water main. Retaining walls, rockeries or similar structures cannot be installed over the water main unless the water main is installed inside a steel casing. 8. The development is subject to applicable water system development charges (SDC’s) and meter installation fees based on the number and size of the meters for domestic uses and for fire sprinkler use. The development is also subject to fees for water connections, cut and caps, and purity tests. Current fees can be found on the City’s website. Current fees will be charged at the time of construction permit issuance. a. The SDC fee for water is based on the size of the new domestic water to serve the project. The current water fee for a single 1-inch meter is $4,050.00 per meter. b. The SDC fee for fire service is based on the size of the fire service line to serve the project. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 3 of 7 June 6, 2019 c. Water service installation charges for each proposed domestic water service is applicable. Water Service installation for a 1-inch water service line is $2,875.00* per service line. d. Drop-in meter fee is $460.00* per meter for a 1-inch meter. This is payable at issuance of the building. e. Final determination of applicable fees will be made after the water meter size has been determined. SDC fees are assessed and payable at construction permit issuance. SEWER 1. The existing on-site septic system serving the existing home shall be decommissioned in accordance with King County Department of Health and City of Renton standards. 2. New 6” side sewers with a minimum slope of 2% connecting to the existing sewer main in Lincoln Avenue NE will be required for all lots fronting Lincoln Avenue NE and lots where a gravity connection is possible. Private utility easements will be needed for any side sewer that passes through an adjacent lot prior to connecting to the existing sewer main. 3. For lots where a gravity connection to the existing sewer main in Lincoln Avenue NE is not possible, individual grinder pumps and force mains will be required for each lot. The private force main should connect to a 6” sewer stub that is a minimum of 2% in slope. Private utility easements will be needed for any force main or gravity side sewer that passes through an adjacent lot prior to connecting to the existing sewer main. 4. The development is subject to a wastewater system development charge (SDC) fee. SDC fee for sewer is based on the size of the new domestic water to serve the project. The current sewer fee for a 1-inch meter install is $3,100.00 per meter. Each lot shall have a separate meter. SURFACE WATER 1. Drainage plans and a drainage report complying with the adopted 2017 Renton Surface Water Design Manual (RSWDM) will be required. Refer to Figure 1.1.2.A – Flow Chart in the 2017 RSWDM to determine what type of drainage review is required for this site. The site falls within the City’s Flow Control Duration Standard (Forested Conditions). The site falls within the May Creek drainage basin. 2.There are regulated slope, erosion hazard, and landslide areas found along the western side of the property. Due to the steep slopes downstream of the project, the project must comply with the Flood Problem Flow Control standard. Therefore, if stormwater will be discharged to the steep slope area then the project must match the Flow Duration of pre-developed rates for Forested Conditions from 50% of the 2-year up to the full 50-year flow, match Forested Site Conditions for the 2- and 10-Year Peaks, and match Existing Site Conditions for the 100-Year Peaks. 3. On-site BMPs satisfying Core Requirement #9 will be required for the site and each individual lots to the extent feasible. On-site BMPs shall be evaluated in order of preference by feasibility as described in Section C.1.3 of the 2017 RSWDM. Final review and approval of the lot BMPs will be evaluated during the review of the Building Permit Application. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 4 of 7 June 6, 2019 4. Any new storm conveyance installed on or off-site shall be designed and sized in accordance with standards found in Chapter 4 of the 2017 RSWDM. New storm drains shall be designed to account for the total upstream tributary area, assuming developed conditions for onsite tributary areas and existing conditions for any offsite tributary areas. Lot owners shall have full, equal, and undivided private ownership and maintenance responsibility of any stormwater network constructed on-site outside of the public ROW. Capture of storm drainage along both site frontages will be required. a.Each lot must have a direct connection to the storm system. 5. If the new plus replaced pollution generating impervious surface exceeds 5,000 SF, the applicant will be required to provide basic water quality treatment. All proposed stormwater facilities shall be designed in accordance with the current RSWDM at the time of civil construction permit application. Separate structural plans will be required to be submitted for review and approval under a separate building permit for all proposed detention and/or water quality vaults. a.Install additional anaerobic grate for ease of maintenance. 6. The flow control or water quality stormwater facilities may be constructed in the public ROW and shall be privately maintained by lot owners. The lot owners shall have full, equal and undivided private ownership and maintenance responsibility of the stormwater facilities. Maintenance access shall be provided to the inlet, outlet, and any control or emergency overflow storm structures of the stormwater facility. Per Core Requirement #1 of the 2017 RSWDM, all stormwater runoff must be discharged at the natural location and comply with discharge requirements 1, 2, and 3 of Section 1.2.1. a.Provide capacity calculations for existing ditch. The discharge point must designed to eliminate any erosion potential downstream. b. Applicant must apply for an easement with the City to be able to construct and maintain private facilities in public right-of-way. 7. A geotechnical soils report for the site is required per the 2017 Renton Surface Water Design Manual Section C.1.3. Information on the water table and soil permeability (measured infiltration rates), with recommendations of appropriate on-site BMPs per Core Requirement #9 and Appendix C shall be included in the report. The report should also include information concerning the soils, geology, drainage patterns and vegetation present shall be presented in order to evaluate the drainage, erosion control and slope stability for site development of the proposed plat. The applicant must demonstrate the development will not result in soil erosion and sedimentation, landslide, slippage, or excess surface water runoff. 8. A Construction Stormwater General Permit from the Washington Department of Ecology will be required if site clearing equals one acre or more. 9. As of September 28, 2018, the City of Renton has developed a new set of Surface Water Standard Plans to replace the existing set. These new Surface Water Standard Plans shall be used in all future drainage plan submittals. 10. The development is subject to stormwater system development charges (SDCs) for the new lots. The 2019 Surface water system development fee is $1,800.00 for each new lot. The SDC that is current is due at the time of construction permit issuance. TRANSPORTATION DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 5 of 7 June 6, 2019 1. Lincoln Avenue NE is classified as a residential access street. Per RMC 4-6-060, the minimum right of way width for a residential access street is 53’. The minimum paved roadway width is 26’ consisting of 2 – 10’ travel lanes and 1 – 6’ bike lane. A 0.5’ curb, 8’ planter strip, and 5’ sidewalk are required along both sides of the pavement. Per the King County Assessor’s Map, the existing right of way width for Lincoln Avenue NE adjacent to the site is approximately 60’. The existing Lincoln Avenue NE paved roadway width adjacent to the site is approximately 24’ to 32’. There is no curb and gutter, planter strip, or sidewalk along the project frontage. The majority of the existing roadway lies in the western half of the right of way. Installation of a 0.5’ curb, 8’ planter strip, and 5’ sidewalk will be required along the frontage. The new curb adjacent to the project site shall be set 18.4’ west of the right of way centerline. The 8’ planter and 5’ sidewalk should be installed directly behind the curb. A right of way dedication of approximately 2’ will be required along the project frontage to accommodate the frontage improvements. The offset of the frontage improvements and right of way dedication is required to straighten out the roadway. The required roadway section for Lincoln Avenue NE is consistent with the required roadway section for Carpenter Short Plat (LUA14-001200) located to the south of this site. 2. NE 38th Street is classified as a residential access street. The existing right of way for NE 38th Street is only partially improved along the project frontage. The existing roadway width is approximately 24’ near the intersection with Lincoln Avenue NE. The road curves within the right of way and serves as an access to the driveways of 1820 and 1825 NE 38th Street. Per the King County Assessor’s Map, the existing right off way width for NE 38th Street adjacent to the site is approximately 60’. A half residential access street will be required along the project’s NE 38th Street frontage. Per RMC 4-6-060, the minimum right of way width for a half residential access street is 35’. The minimum paved roadway width 20’ consisting of 2 – 10’ travel lanes. A 0.5’ curb, 8’ planter strip, and 5’ sidewalk are required along the project frontage. a.Show shoulder treatment, retaining wall, and guard rails in profile views. Guardrails shall be per WSDOT standard specifications. Retaining walls within public right of way shall be designed per AASHTO standards. 3. A curb return radius of 25’ is required at the intersection of NE 38th Street and Lincoln Avenue NE. a.Curb ramps must meet ADA requirements to the maximum extent feasible. 4. If a shared driveway is proposed as part of this development it shall meet the design standards found in RMC 4-6-060. Shared driveways may be allowed for access to four (4) or fewer residential lots. Shared driveways shall be wholly in a tract. Shared driveways shall not be more than 200’ in length. The paved surface shall be a minimum of 16’ but may be up to 20’ to meet Renton Regional Fire Authority standards. The maximum grade of the shared driveway shall not exceed 15%. Drainage improvements per City standards are required along the shared driveway. An access easement shall cover the entirety of the tract. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 6 of 7 June 6, 2019 5. Street lighting per City standards is required along the project’s Lincoln Avenue NE and NE 38th Street frontages as the proposed development is larger than 4 residential units. A street lighting plan and photometric analysis should be submitted at the time of construction permit submittal. 6. Paving and trench restoration shall comply with the City’s Trench Restoration and Overlay Requirements. 7. The transportation impact fee is based on the type of land use. For a single family dwelling, the 2019 transportation impact fee is $7,820.42. Transportation impact fees are subject to change based on the calendar year the building permit is issued. GENERAL COMMENTS 1. All existing and proposed utility lines (i.e. electrical, phone, and cable services, etc.) along property frontage or within the site must be underground. The construction of these franchise utilities must be inspected and approved by a City of Renton inspector. 2. Maximum exposed retaining wall height is 6-ft and shall be setback a minimum of 3-ft from the right-of-way as outlined in RMC 4-4-040 – Fences, Hedges and Retaining Walls. a.Show all retaining walls on profile view. No walls shall be greater than 6’. 3. Retaining walls that are 4’ or taller from bottom of footing and stormwater detention vaults will require a separate building permit. Structural calculations and plans prepared by a licensed engineer will be required as part of the building permit review. a.There are retaining walls above 4 feet and a stormwater detention vault in your project design. b.Retaining walls within public right of way shall be designed in accordance with AASHTO standards. The structural design of these retaining walls shall be reviewed as part of the Civil Construction Plan Review by a third party reviewer to be paid for by the applicant as specified by the City of Renton Fee Schedule. 4. Adequate separation between utilities as well as other features shall be provided in accordance with code requirements: a.Provide rim and invert elevations on all drainage and sewer structures. b. 7-ft minimum horizontal and 1-ft vertical separation between storm and other utilities is required with the exception of water lines which require 10-ft horizontal and 1.5-ft vertical. i.Revise utility plan to show minimum horizontal distance of 10 feet between storm and water mains. ii.Revise utility plan to show minimum horizontal distance of 7 feet between storm and sewer mains. c. The stormwater line should be minimum 5 feet away from any other structure or wall or building. i.Revise utility plan to show minimum horizontal distance of 5 feet between storm pipe and retaining walls, structures, etc. d. Trench of any utility should not be in the zone of influence of the retaining wall or of the building. 5. All civil construction permits for utility and street improvements will require separate plan submittals. All utility plans shall confirm to the Renton Drafting Standards. A licensed Civil Engineer shall prepare the civil plans. Please visit the Development Engineering Forms page for the most up-to-date plan submittal requirements: DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C 38th Street Short Plat – LUA18-000683 Page 7 of 7 June 6, 2019 http://rentonwa.gov/business/default.aspx?id=42473 6. A landscaping plan shall be included with the civil plan submittal. Each plan shall be on separate sheets. 7. A demo permit is required for the demolition of the existing building. The demo permit shall be acquired through the building department. 8. Fees quoted in this document reflect the fees applicable in the year 2019 only and will be assessed based on the fee that is current at the time of the permit application or issuance, as applicable to the permit type. Please visit www.rentonwa.gov for the current development fee schedule. DocuSign Envelope ID: 0DD0488B-0612-4AC1-AD49-04E0C47D2B7C