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Attachment 4 - 7.pdfI City of Edmonds PLN20180037 0 68.85 137.7 Feet This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, WGS_1984_Web_Mercator_Auxiliary_Sphere current, or otherwise reliable. © City of Edmonds THIS MAP IS NOT TO BE USED FOR DESIGN OR CONSTRUCTION Legend ArcSDE.GIS.STREET CENTERLINE; <all other values> 1 2 5; 4 9;71;7;8 Notes 2-Lot Short Plat 20020 83rd Ave. W. ,=- City of Edmonds PLN20180037 ► oo•. 1} /.1ou�llakt _ _ rn ` •a , / Legend _ 0 ReZones L PRD 224 20+ 0 R°W N 0O N OFC11 Zoning RS-6 M r IRS RS-10 20015 2001 �! �� RS-12 ® RSW-12 200 an RS-20 N 200100 El RS-MP LU 200 MOT RM-3 O� 20024 ■ RM-2.4 RM-1.5 '� RM_EW 1 20100 BD1 ►• ►• +\ BD2 +\ BD3 0� 5 2+102 N 20+32 BD4 � O CZ) N BD5 OR 3► WMU N BP BN 0110 -' FVMU 2011'1 20114 2+111 CTI ^- � BC Notes 2-Lot Plat 0 68.85 137.7 Feet This map is a user generated static output from an Internet mapping site and is for Short 20020 83rd Ave. W. reference only. Data layers that appear on this map may or may not be accurate, WGS_1984_Web _Mercator _Auxiliary —Sphere current, or otherwise reliable. © City of Edmonds THIS MAP IS NOT TO BE USED FOR DESIGN OR CONSTRUCTION WESTERN ENGINEERS & SURVEYORS SURVEYORS • ENGINEERS • LAND USE, CONSULTANTS 9740 Evergreen Way • Everett, WA '98204 P: (425) 356-2700 F: (425) 356-2708 W: WESI:CO Targeted Stormwater Report For EVA.NS Short Plat 20020 — 83RD AVE W EDMONDS, WASHINGTON City of Edmonds Project # PLN20180037 Issue Date: May 18, 2018 Revision Date: September 25, 2018 PREPARED BY: ERIC HAINES, E.I.T. REVIEWED BY: JESSE JARRELL, P.E. 0S— 2S-18 CLIENT(S): SIMON EVANS 20020 — 83" AVE W EDMONDS, WA 98026 (734) 846-6181 r QED OCT 04 2013 OEVELOR',IENT SEFMCES COUNTER ' - WESTERN ENGINEERS, INC. Job No..17-1701-A ATTACHMENT 5 EVANS — 2 Lot S.P. 1. ATTACHMENT "A" DRAINAGE INFORMATION SUMMARY FORM Project Name: EVANS — 2 LOT S.P. Project Engineer: WESTERN ENGINEER Project Applicant: SIMON EVANS EDMONDS, WA Project Total Area: 0.581 Acres Project Development Area: 0.265 Acre Summary Table Drainage Basin Information Individual Basin Designation A B C D On -site Development Area 0.265 ac. Type of Storage Proposed N/A Approximate Storage Volume N/A Soil types ALDERWOOD Type C WESTERN ENGINEERS, INC. PROJECT: 17-1701-A EVANS — 2 Lot S.P. Minimum Requirement # 1: Stormwater Site Plan Executive Summary The proposed project is located at 20020 83RD AVE W in the City of Edmonds, within Snohomish County, Washington. More generally, the site is located in Section 19, Township 27 North, and Range 4 East of the Willamette Meridian in Edmonds, Washington. Please refer to the Vicinity Map attached in the next section. The project contains approximately 0.581 acres, which is covered by an existing house, concrete patio, shed, detached garage, and asphalt driveway. The preliminary proposal is to subdivide 0.581 acres into two housing lots with associated utilities. The existing house, patio, and the driveway on proposed Lot 2 will be retained, both proposed lots will access 83rd Ave W via a proposed 12' wide paved shared driveway along the northern side of the property. The project is to be designed to the 2012 (With 2014 Updates) WADOE Stormwater Design Manual and City of Edmonds 2017 Stormwater Codes. Drainage management for new hardscape areas will primarily be provided by roof drain perforated pipe stub out trenches (T5.1 OC) and driveway dispersion (T5.12) BMPs. Disturbed vegetated areas will be amended per soil quality BMP T5.13. All utilities to be provided by existing services on 83rd Ave W fronting the site. Existing Conditions Summary The site is partially developed with an existing house, concrete patio, shed, detached garage and asphalt driveway on the western half of the. Existing on -site vegetation primarily consists of residential lawn with tree cover. The site generally slopes northwest to southeast at slopes ranging from 2% to 8%. From the Soil Conservation Service Map of Snohomish County, the site contains Alderwood Urban Land Complex type soils. Please refer to the soil map and descriptions attached later in this report. WESTERN ENGINEERS, INC. PROJECT: 17-1701 -A EVANS — 2 Lot S.P. I • i c 'e\ vug�`n: �Casperr. ,^.t T)HE BOWL OF�EDMONDS 4 i ands �' mo in of VICINITY MAP ,13- , Q�� aw O� A� A .q O P E R R I N V I L L E I_vnnciale Park Cnstno Business Picnic Shelter girt C fi F ry Trader Joe's P Edmonds Ly0o nn�,vC1 Community a !, College L m � D- O SEATTLE HEIGHTS Yost Park » fcn M sw :ri zu, sc SIN Edmond,; Wvockvay n© Anlfdrai High School T °k�v Swedish 19 y 1=dmonris Camp-j!3 » WinCo Foods Premera Blue Cr; ,;. �xutn ss srr Red Dragon Casino a2nrh sc sw J :° ry 99 Ranch Market Q t Esperance WESTGATE _--• _ -• l" MAP TAKEN FROM GOOGLE MAPS WESTERN —'• ENGINEERS & SURVEYORS SURVEYORS • ENGMEERS • LAND USE CONSULTANTS EVANS SHORT PLAT EDMONDS, WA 98026 zzr SCALE: DATE: 04/04/18 CHECKED: JAJ 9740 Evergreen Way, Everett WA 98204 1" _ _1,000' (425) 356-2700+ (425) 356-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: EMH 17-1701-A 171701A/VICINITYMAP WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. OFFSITE ANALYSIS Site reconnaissance was done by Eric Haines, E.I.T. of Western Engineers Inc. on April 03, 2018. Weather during the investigation was mostly cloudy with a temperature around 45 degrees. A: Upstream Analysis It appears from the topography of the site that upstream sheet flows may occur from lawn areas to the north and west. However, during the site visit, no evidence of any significant flows was observed. Any contributions to surface flows from off -site are expected to be minor and no other significant upstream flows appear to enter the property. B: Downstream Analysis Please refer to the Downstream Analysis Map attached in the next section for a detailed depiction of the downstream drainage course. The site is partially developed with an existing SFR, patio, shed, detached garage and driveway. The majority of the site slopes from northwest to southeast towards the storm system and sheet flows directly into an underground storm system on the west side of 83rd Avenue W (see photo 3). Intercepted flows enter a series of catch basins on the west side of 83rd Avenue W. Flows entering the catch basins are routed approximately 1025 feet south in a storm system along the west side of 83rd Ave were it enters into an open ditch system going through Pine Ridge Park(see photos 3 through 5). Access into the ditch system was not possible due to dense vegetation. No visible drainage problems were observed during the initial and follow-up field inspections. Refer to the following pages for Aerial and Downstream Map. Drainage Complaints There are no found drainage complaints for this site. WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. BASIN AND AERIAL MAPS WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. AERIAL AND DOWNSTREAM MAP TAKEN FROM GOOGLE EARTH W STERN NGINEERS & SURVEYORS SURVEYORS• ENGINEERS- LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) EVANS SHORT PLAT EDMONDS, WA 98026 SCALE: None DATE: 04/04/18 CHECKED: JAJ BY: EMH JOB NUMBER: FILE NAME: 17-1701-A I Aerial Map WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. DOWNSTREAM PHOTOGRAPHS WESTERN ENGINEERS, INC. PROJECT: 17-170 1 -A EVANS — 2 Lot S.P. DOWNSTREAM PHOTOGRAPHS PHOTO 2: Figure to the Right: Looking easterly along the proposed driveway = WESTERN ENGINEERS & SURVEYORS SURVEYORS • ENGINEERS • LAND USE CONSULTANTS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com PHOTO 1: Figure the Left: Looking southeast from the existing driveway EVANS SHORT PLAT EDMONDS, WA 98026 SCALE: None I DATE: 04/04/18 1 SHEET: 1 OF 3 JOB NUMBER: FILE NAME: BY: EMH 17-1701-A Downstream LDOC WESTERN ENGINEERS, INC. PROJECT: 17-1701-A EVANS — 2 Lot S.P. PHOTO 4: Figure to the Right: Looking south at a catch basin located along 83'd Ave W _ 'WESTERN ENGINEERS & ,SURVEYORS SURVEYORS • ENGINEERS • LAND USE CONSULTANTS PHOTO 3: Figure to the Left: Looking west at the manhole on the east side of the site EVANS PROPERTY EDMONDS, WA 98026 9740 Evergreen Way, Everett WA 98204 SCALE: None DATE: 4/04/18 SHEET: 2 OF 3 (425) 356-2700 (425) 30-2708 (FAX) JOB NUMBER: FILE NAME: westernengineers.com BY: EMH 17-1701-A D.S.PHOTOS.DOC WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. DOWNSTREAM PHOTOGRAPHS PHOTO 6: Figure to the Right: Direction of flow into Pine Ridge Park WESTERN ENGINEERS & SURVEYORS SURVEYORS • ENGINEERS • LAND USE CONSULTAN3 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 3�-2708 (FAX) westernengineers.com PHOTO 5: Figure to the Left: Looking north along 83'a Ave W EVANS PROPERTY EDMONDS, WA 98026 SCALE: None DATE: 4/03/18 SHEET: 3 OF 3 JOB NUMBER: FILE NAME: BY: EMH 17-1701-A D.S.PHOTOS.DOC WESTERN ENGINEERS, INC. PROJECT: 17-1701-A EVANS — 2 Lot S.P. Minimum Requirement # 2: SWPPP Narrative Element #1: Mark Clearing Limits Clearing limits have been shown on the Temporary Erosion and Sedimentation Control Plans. Element #2: Establish Construction Entrance A temporary construction entrance has been shown at the location of the proposed driveway that is to access 83'd Ave `J�'. All vehicles shall be free of debris prior to leaving the site. Element # 3: Control Flow Rates Flow rates during construction are to be contained through the installation of silt fencing. Element # 4: Install Sediment Controls Sediment controls mainly consist of installing silt fencing along the western boundary of the clearing/construction limits. Element # 5: Stabilize Soils All soils disturbed during site grading will be stabilized by use of the most appropriate BMP method available. These consist of short-term and long-term solutions. Short-term methods consist of compaction of the soils by vibratory roller or bulldozer. Long-term methods consist of straw covering over the soils (this is in the case of the project becoming dormant for greater than 1 month). At this time no wintertime grading or construction activities will occur. During construction periods longer than 1 working week (7 days) where the soils are exposed and un- worked will use the proscribed methods in the Storm Water Management Manual for Western Washington to reduce sedimentation transported offsite. If winter grading is conducted, all exposed soils shall be covered within 2 days. Element # 6: Protect Slopes There are no known steep or significant slopes on -site; therefore, slope protection is not necessary. Element # 7: Protect Drain Inlets The off -site catch basins along the west side of 83rd Ave W will be provided sediment protection with catch basin inserts or equivalent. Element # 8: Stabilize Channels and Outlets Channels and drainage outlets are not needed around the proposed development area on site. No stabilization is necessary. Existing channels or drainage outlets located within 500-feet of the property of the property should be routinely inspected for debris that may dam and/or aid erosion. WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Element # 9: Control Pollutants All pollutants from construction vehicles will be contained and disposed of in the approved manner consistent with state environmental policies. Any vehicle maintenance will be performed by authorized mechanics using drip pans and waste containment vessels. All pollutants will be disposed offsite at approved facilities. Element # 10: Control De -Watering De -watering of the site is not expected. If dewatering of the site is needed, all groundwater removed shaii be retained and recharged into the ground after de - watering has been finalized. Element # 11: Maintain BMP's All Temporary Erosion and Sedimentation Control (TESC) devices and equipment will be inspected and maintained on a weekly basis if not sooner, based on storm events contributing to runoff. When construction is complete and the site is stabilized, any existing sediment will be removed and stabilized onsite. Element # 12: Manage the Project A general construction manager will manage the project for or by the owners. The construction manager shall maintain all of the above items in order to minimize sediment transport and turbid water leaving the site. His job will entail continual observation of the grading operations to ensure minimal effects to adjacent properties and offsite waterways. Element # 13: Protect Low Impact Development BMPs Proposed dispersion flow path areas and soil amendment areas will be protected from compaction when feasible. Minimal Requirement # 3: Water Pollution Source Control All proposed development is to consist of residential construction. No water pollution source control is needed. Minimum Requirement # 4: Preservation of Natural Drainage Systems and Outfalls, and provisions of off -site mitigation No changes to the existing drainage systems and outfalls are proposed with this development. All existing and new runoff to continue to flow southeasterly into the existing storm system along the west side of 83rd Ave W. WESTERN ENGINEERS, INC. PROJECT: 17-1701 -A EVANS — 2 Lot S.P. Minimum Requirement #5 On -Site Storm Water Management The project results in less than 5,000 square feet of new/replaced hard surfaces and is considered a Category 2 project. Category 2 projects must evaluate Minimum Requirements 1 through 9 and select on -site stormwater BMPs according to List 2 for each proposed hard surface. Note that due to geometry, spacing between the property lines and the site consisting of an erosion hazard in the southeast portion of the site, infiltration and dispersion BMPs are generally infeasible. Refer to List 2 below for appropriate BMP selection or infeasibility description: Lawn and landscaped areas: • Post -Construction Soil Quality and Depth in accordance with BMP T5.13 in Chapter 5 of Volume V. (To be used in disturbed vegetated areas) Roofs feasibility description: 1. Full Dispersion per BMP T5.30 or Downspout Full Infiltration per BMP T5.1 OA. i. Full Dispersion is infeasible due to insufficient flow path length and lack of native forest vegetation. Full Infiltration is infeasible due to lack of spacing between property line and proposed edge of house 2. Bioretention per Volume V, Chapter 7. i. Due to the fact that the entire site consists of inadequate soil depth for roof drain infiltration, bioretention facilities are infeasible. 3. Downspout Dispersion Systems in accordance with BMP T5.10B. i. Due to the fact that there is not enough space between the property line and the proposed edge of house, along with the fact that the southeastern portion of the site is considered an erosion hazard area, downspout dispersion is infeasible for roof runoff. 4. Perforated Stub Out Connections BMP T5.10C i. Perforated Stub Out has been selected for this project because it is a feasible option and all high priority options are infeasible. Other Hard Surfaces feasibility description: 1. Full Dispersion per BMP T5.30 i. As noted above, Full Dispersion is infeasible due to insufficient flow path length and lack of native forest vegetation. 2. Permeable Pavement per BMP T5.15 i. Due to the fact that the entire site consists of inadequate soil depth to provide adequate separation between pavement subgrade and the hardpan layer, permeable pavement is infeasible. 3. Biorention per Volume V, Chapter 7. i. Due to the fact that the entire site consists of inadequate soil depth for infiltration, bioretention facilities are infeasible. 4. Sheet Flow Dispersion in accordance with BMP T5.12 or BMP T5.11. i. Sheet Flow Dispersion per BMP T5.12 is feasible for future driveway pad for lot 1. Sheet flow dispersion for existing shared driveway is infeasible due to the runoff potentially being directed WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. to the future house on lot 1 and/or directed to erosion hazard areas in the southeast portion of the site. All new existing/new driveway runoff for the shared driveway access to directly drain into new undground storm system and tightlined to existing storm system along the west side of 83'd Ave W. Existing Hard Surfaces retrofit description per EDC 18.30.060.D.5.B.i: Per Code section referenced, a minimum of 25% of existing hard surfaces on -site shall be Improved with on -site stormwater BMP's. Total existing hard surfaces on the -rope, ty total approximately 6,577 sf. Due to on -site slopes/erosion hazard areas, proximity of existing improvements being located upstream of future residence along with less than 36" permeable soils on -site, the majority of potential stormwater BMP's to use for existing hardscape are infeasible. With that, the existing residence roof area runoff has been proposed to be conveyed to new 2'x10' perforated pipe connection near the northeast corner of the house with overflow connections provided to new storm system. With approximately 2,347 sf of existing roof area flowing to a perforated pipe connection, this constitutes approximately 35.7% of existing hardscape area being upgraded with new stormwater BMP's. Minimum Requirement # 6: Runoff Treatment Due to the site proposing less than 5,000 sf. of new pollution generating impervious surfaces, less than 3/ acres of forest to lawn conversion, and less than 2.5 acres of forest to pasture conversion, runoff treatment is not required. Minimum Requirement # 7: Flow Control Due to the site proposing less than 5,000 sf of new/replaced impervious surface, less than 3/ acres of forest to lawn conversion, less than 2.5 acres of forest to pasture conversion, flow control is not required. Refer to the summary below for an overview of the hardscape calculations. Total Area of the Site = 25,327 sf. (0.581 Ac.) Total Clearing Area = 11,550 sf. (0.265 Ac.) Existing On -Site Before ClearinE Impervious area: Ex. SFR Roof = 2,347 sf. Ex. Garage Roof = 830 sf. *Ex. Wood Shed Roof = Ill sf. *Ex. Concrete Patio & Walks= 1,470 sf. *ExistingDwy to Remain = 1,819 sf. Total = 6,577 sf. (0.151 Ac.) Pervious area: Existing Lawn Area = 19,237 sf. (0.442 Ac.) WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Proposed Site Impervious area: Ex. SFR Roof = 2,347 sf. Ex. Garage Roof = 830 sf. *Ex. Wood Shed Roof = 111 sf. *Ex. Concrete Patio & Walks= 1,470 sf. *Existing Dwy to Remain = 1,819 sf. Shared Driveway Add = 140 sf. ± Prop SFR, D Yvy Lot 1 — 4,800 sf. ± Total = 10,430 sf. (0.239 Ac.) New/Replaced Impervious Surface = 4,940 sf. *Note: Does not include areas located below roof eaves. Pervious area: Existing Lawn to Remain Proposed Amended Lawn = 7,687 sf. (0.176 Ac.) = 7,648 sf. (0.176 Ac.) WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Minimum Requirement # 8: Wetland Protection There are no known wetlands on -site. Note that defined clearing limits, silt fencing, and large vegetated spaces shown on the LDA plan will protect any downstream wetlands or streams. Minimum Requirement # 9: Operation and Maintenance Manual BMP T5.13 Post -Construction Soil Quality and Depth Maintenance • Soil quality and depth should be established toward the end of construction and once established, should be protected from compaction, such as from large machinery use, and from erosion. • Soil should be planted and mulched after installation. • Plant debris or its equivalent should be left on the soil surface to replenish organic matter. WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Table V 4.5.2(5) Maintenance Standards - Catch Basins Results Maintenance Defect Conditions When Maintenance is Expected When Main- Component Needed tenance is performed No Trash or debris loc- Trash or debris which is located imme- ated imme- diately in front of the catch basin opening or diately in is blocking inletting capacity of the basin by front of catch more than 10%. basin or on 'Trash or debris (in the basin) that exceeds grate open- 150 percent of the sump depth as measured ing. from the bottom of basin to invert of the low- No trash or est pipe into or out of the basin, but in no debris in the Trash & case less than a minimum of six inches catch basin. Debris clearance from the debris surface to the invert of the lowest pipe. Inlet and out- let pipes free Trash or debris in any inlet or outlet pipe of trash or blocking more than 1/3 of its height. debris. General Dead animals or vegetation that could gen- No dead erate odors that could cause complaints or animals or dangerous gases (e.g., methane). vegetation present within the catch basin. Sediment (in the basin) that exceeds 60 per- cent of the sump depth as measured from -the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case No sediment Sediment less than a minimum of 6 inches clearance in the catch from the sediment surface to the invert of the basin lowest pipe. Structure Top slab has holes larger than 2 square Top slab is Damage to inches or cracks wider than 1/4 inch. (Intent free of holes Frame and/or is to make sure no material is running into and cracks. Top Slab basin). Frame is sit 2014 Storrnwater Management Manual for Westem Washington Volume V - Chapter 4 - Page 838 WESTERN ENGINEERS, INC. PROJECT: 17-1701-A EVANS — 2 Lot S.P. Table V-4.5.2(5) Maintenance Standards - Catch Basins (continued) Results Maintenance Defect Conditions When Maintenance is Expected When Main- Component Needed tenance is performed Frame not sitting flush on top slab, i.e., sep- ting flush on the riser rings aration of more than 314 inch of the frame from the top slab. Frame not securely or top slab and firmly attached attached. Basin Maintenance person judges that structure is replaced or unsound. repaired to Fractures or Cracks in Grout fillet has separated or cracked wider design stand - Basin Walls/ than 1 /2 inch and longer than 1 foot at the ards. Bottom joint of any inlet/outlet pipe or any evidence Pipe is of soil particles entering catch basin through regrouted cracks, and secure at basin wall. Basin Settlement/ If failure of basin has created a safety, func- replaced or repaired to Misalignment tion, or design problem. design stand- ards. No veget- 'Vegetation growing across and blocking ation block - more than 10% of the basin opening. ing opening to basin. Vegetation 'Vegetation growing in inlet/outlet pipe joints No veget- that is more than six inches tall and less ation or root than six inches apart. growth present. Contamination See "Detention Ponds" (No. 1). No pollution and Pollution present. Cover is missing or only partially in place. Catch basin Cover Not in Any open catch basin requires main- cover is Catch Basin Place tenance. closed Cover Locking Mech-Mechanism cannot be opened by one main- Mechanism anism Not tenance person with propertools. Bolts into opens with 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 4 - Page 839 WESTERN ENGINEERS, INC. PROJECT: 17-1701 -A EVANS — 2 Lot S.P. Table V 4.5.2(5) Maintenance Standards - Catch Basins (continued) Results Maintenance Defect Conditions When Maintenance is Expected When Main- Component Needed tenance is performed Working frame have less than 1/2 inch of thread. propertools. One maintenance person cannot remove lief Cover can be Cover Difficult after applying normal lifting pressure. removed by to Remove (Intent is keep coverfrom sealing off access one main - tenance per - 'to maintenance.) son. Ladder meets design stand. Ladder Rungs Ladder is unsafe due to missing rungs, not ards and Ladder Unsafe securely attached to basin wall, mis- allows main - .alignment, rust, cracks, or sharp edges. tenance per- son safe access. Grate open - Grate opening Grate with opening wider than 7/8 inch. ing meets Unsafe design stand- ards. Metal Grates Trash and Trash and debris that is blocking more than Grate free of (IfApplic- Debris 20% of grate surface inletting capacity. trash and able) debris. Grate is in Damaged or Grate missing or broken member(s) of the place and Missing. grate. meets design standards. WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Table V-4.5.2(7) Maintenance Standards - Energy Dissipaters Results Expec- Maintenance Conditions When Maintenance is ted When Main Components Defect Needed tenance is Performed External: Only one layer of rock exists above nat (Missing or livA Rock pad replaced to Moved it in five r r r- .... soy.... area ..ve square feet o. !a, design stand- Rock ger, or any exposure of native soil. ards. Rock Pad Rock pad Erosion Soil erosion in oradjacentto rock pad. replaced to design stand- ards. Pipe Pipe cleaned/ - Plugged Accumulated sediment that exceeds flushed so that with Sed- 20% of the design depth. it matches iment design. Not Dis- Visual evidence of water discharging Trench Dispersion Trench charging at concentrated points along trench redesigned or 'Water Prop- (normal condition is a sheet flow of rebuilt to stand- erly water along trench). Intent is to prevent ards. erosion damage. Perforations Over 1/2 of perforations in pipe are Perforated pipe cleaned or Plugged. plugged with debris and sediment. replaced. 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 4 - Page 841 WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. Table V-4.5.2(7) Maintenance Standards - Energy Dissipaters (continued) (Results Expec Maintenance Defect Conditions When Maintenance is ed When Main Components Needed tenance is Performed Water Maintenance person observes or Out t ut Ou receives credible report of water flow Facility rebuilt Top of T ofibutor" - ing out during any storm less than the or redesigned trop design storm or its causing or appears to standards. Catch likely to cause damage. Basin. Receiving Water in receiving area is causing or No danger of Area Over- has potential of causing landslide prob landslides. Saturated lems. I ntern a I Worn or Damaged Structure dissipating flow deteriorates Structure 1post, to 1/2 of original size or any con- replaced to Manhole/Chamber,gaffles, centrated worn spot exceeding one design stand- -Side of square foot which would make struc- ards. Chamber ture unsound. Other See "Catch Basins" (No. 5). See "Catch Bas Defects ins" (No.5). WESTERN ENGINEERS, INC. PROJECT:17-1701-A EVANS — 2 Lot S.P. APPENDIX I Drainage Plan WESTERN ENGINEERS, INC. PROJECT: 17-1701 -A • wvxo maw/rAP As �n�m m Le'. zr' mew/cw Wm_ x nun s�nr pW gaol ® reele[R ow xar soulm natrs ®O Di,wi.�c cw wu r� fyV =m _7_ � re.r.�.n• o� r c� Acw.0 e.sm• �v. Ko ---�ro L==_A W/Boar armwc —errs urw �•� V rIO w SWI/4, NE1/4, SEC.19, T27N., R.4E., W.M. CITYOFEDMONDS, WASHNGTON •2' MIN. WIDE GRAVEL FLOW SPREADER. 6- MIN. DEPTH —7p' SCOPEOpE MIN. VEC. FLOWPAM -NOTE 10' VEGETATED FLOW PATH OC am" REQUIRED FOR EVERY 20' OF DRIVEWAY MAX 4CKJ WIDTH CONTRIBUDNG TO FLAW NEW DRIVEWAY SECTION DETAIL NOT TO SCALE 2v FA•4 eN WA112- EO ROIX• r e� TRENCH X-SECTION I 1 SLOPE + � t 7 \lV ORANALOE SYSTEM ■ I PLAN VIEW OF ROOF �•" PERFORATED TIGHTLINE CONNECTION -� NO' M SCALE �• rA+non � h, HV.LFHr m�E.Sli r�R+• - -�/•' �� APORwm :N.aR.oe Sff0WDWWAYDMX& n sH ar a o 1 0 I wme e.r. ek ., metre w wed euo.0 u, raRaws'w rer (� /,� I I I I 3 1 AT!TWARBATABM Ull � NrwA,rR,.,o ap, suNAcr# .a.a er. EVANS — 2 Lot S.P. APPENDIX I.I SOIL INFORMATION WESTERN ENGINEERS, INC. PROJECT: 17-170 1 -A EVANS — 2 Lot S.P. SOIL LOG INFO. SOIL LOGS PROVIDED BY ERIC HAINES APRIL 3, 2018 SL-1 011-611 SILTY LOAM W/ ORGANICS 611-2411 LIGHT BROWN SILTY LOAM 2411 HARDPAN SL-2 011-611 SILTY LOAM W/ ORGANICS 611-3611 LIGHT BROWN SILTY LOAM 361 HARDPAN NO GROUND WATER DETECTED USDA SOIL MAP Snohomish County Area, Washington (WA661) Snohomish County Area, Washington (WA661) Map Acres percent Unit Map Unit Name of A0I Symbol AOI 5 Alderwood-Urban 0.6 100.00/a land complex, 2 to 8 percent slopes Totals for Area of 0.6 100.00/0 Interest WESTERN ENGINEERS, INC. PROJECT: 17-170 1 -A EVANS - 2 Lot S.P. USDA SOIL MAP LEGEND 5—Alderwood-Urban land complex, 2 to 8 percent slopes Map Unit Setting • National map unit symbol: 2hz9 • Elevation: 50 to 800 feet • Mean annual precipitation: 25 to 60 inches • Mean annual air temperature: 48 to 52 degrees F • Frost -free period: 180 to 220 days • Farmland classification: Not prime farmland Map Unit Composition • Alderwood and similar soils: 60 percent • Urban land: 25 percent • Minor components: 6 percent • Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting • Landform: Till plains • Parent material: Basal till Typical profile • HI - 0 to 7 inches: gravelly ashy sandy loam • H2 - 7 to 35 inches: very gravelly ashy sandy loam • H3 - 35 to 60 inches: gravelly sandy loam Properties and qualities • Slope: 2 to 8 percent • Depth to restrictive feature: 20 to 40 inches to densic material • Natural drainage class: Moderately well drained • Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.06 in/hr) • Depth to water table: About 18 to 36 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Low (about 3.0 inches) Interpretive groups • Land capability classification (irrigated): None specified • Land capability classification (nonirrigated): 4s • Hydrologic Soil Group: B • Other vegetative classification: Limited Depth Soils (G002XN302WA) Minor Components Mckenna • Percent of map unit: 2 percent • Landform: Depressions Norma • Percent of map unit: 2 percent • Landform: Depressions Terric medisaprists • Percent of map unit: 2 percent • Landform: Depressions WESTERN ENGINEERS, INC. PROJECT: 17-1701-A EVANS — 2 Lot S.P. APPENDIX III SOIL AMENDMENT WESTERN ENGINEERS, INC. PROJECT:17-1701-A E U C J'Lli� Q';' [�iu FJE'V=L0[-11'0r,,E1-F SERM.ES, E&on& Utilities Co�Mn CUSTOMER - EUC CONTACT Form A coordinated utility environment which maximizes joint utility opportunities to provide quality service for the citizens of Edmonds YOU WILL BE GIVEN A CONFIRMATION NUMBER BY EACHUTILITY ONCE YOU HAVE INFORMED THEM OF YOUR PROJECT. SITE ADDRESS: ZOOz� '6S ; `� A vE W -7, Z0- 2r Mary McAllister - 425-670-3216 You will need to provide PUD with a site plan and a completed New Service Questionnaire. PUGET # SOUND ENERGY S V') j & V New Customer Construction Call to verify gas availability and to coordinate service install. You will need to Department - 1-888.321.7779 provide parcel number, contact phone number and mailing address. i� er ftA7'toc2Qmce qI( Nov Frontier bo�J "lr�n,�1 You will need to provide Frontier with the location of your project, total line Temp-Fl - D 14 3 plot requirement, and the date in which service is required. A copy of your # 71t-l(z Z 1 "3 Mike Fontenot 425-'2'6�,5482 You will need to provide Comcast with the location of your project, a copy of your development and site plan (digital copy if available.) The date in which service is required and a list of contact names, phone numbers & mailing MP1c V#1i # ,�J C,+i3 of 0 v,,QK-d S • ��,Q Sf1ArtROSti• Steve Dunphy - 425.774.7769 ext. 110 You will need to provide OVWSD with the survey map of your site and For customers in Olympic View Service Area complete a development information form. THIS FORM MUST BE COMPLETED AND GIVEN TO DEVELOPMENT SERVICES STAFF AT THE TIME OF PERMIT SUBMITTAL Rev. 10/1/13 ATTACHMENT 6 PUGET SOUND ENERGY Puget Sound Energy P.O. Box 97034 Bellevue, WA 98009-9734 PSE.com May 41h 2018 Eric Eric Haines, EIT 9740 Evergreen Way Everett, WA 98204 425-356-2700 x107 website: wesi.co To Whom It May Concern, Puget Sound Energy (PSE) will provide new gas service to 20020 83rd Ave W, Edmonds, Wa 98026, TaxAcct No. 00431200000201 according to the terms and conditions of Rule 6 and with the Washington Utilities and Transportation Commission. Any Easements needed to serve the parcel or special permits or conditions required by those permits are the sole responsibility of the owner in accordance with the same schedule and tariff listed above. Thank You, Jordan Cooper Associate Project Manager / Customer and System Projects ® PUGETSOUND ENERGY Cell: 425-623-5302 Jordan. Cooper@ pse.com PLEASE EMAIL REQUESTS PUG ET Maps & Records SOUND External Request Form Phone (425) 456-2511 ENERGY email: MapRequest@pse.com for forms and returning completed forms 355 110th Avenue NE, Bellevue WA 98004 Please allow 5 to 10 working days for delivery. Date 4/4/2018 Phone 425-356-2700 107 EXT. Agree to PSE' Security Agreement I YES I yes Utility Information Requested: Electric x Gas Contact Name Eric Haines Contact email: erich@wesi.co Agency/Firm Western Engineers & Surveyors, Inc. Address / Street 9740 Evergreen Way City, State, Zip Everett, WA 98204 Project Type: Public Improvement (Road Widening, Sidewalks, Utilities, Etc.) City, County, Township (Funded) x Private Development (New Construction, Residential, Commercial, Industrial, Short Plats, Etc.) Project Name: Evans Short Plat Project Location I Site Address: Please include cross street before and after requested address: 20020 83rd AveW, Edmonds. WA 98026 Approximately 150 feet south of the intersection of 200 Street SW and 83rd Avenue W Required: Project COUNTY - City & Zip Isnohomish JEdmonds 98026� County City Zip REQUIRED* 1/4 Sec(s) Township Range: can be found in The Thomas guide 1/4 Section NE 19 Township T27N Example 30 T29N Range R4E R5E If requesting more than one Quarter Section fill out attached sheet -- see page 2. Detail Protect Description (I.e. road widening with stormwater improvement: Residential Plat: etc.) Subdivision of property with retention of existing house on proposed Lot 2. Lot 1 to construct new residence with shared driveway, utility installation, and stormwater improvements. Please Select One Yes No Unknown FRONTAGE IMPROVEMENT IN RIGHT OF WAY x FEDERAL FUNDS INVOLVED IN THE PROJECT x UTILITIES RELOCATION REQUIRED FOR PROJECT? x NOTE: By identifying utilities early in the design phase costly relocations may be avoided or minimized. When you receive Puget Sound Energy facility maps you will also receive contact information to help and provide your costs if your project area is impacted by PSE natural gas and/or electril facilities. "IT'S THE LAW" - CALL TWO (2) BUSINESS DAYS BEFORE YOU DIG - 811 or 1.800.424.5555 or callbeforeyoudig.org form date 1/15/10 CITY OF EDMONDS 121 51h Avenue North, Edmonds WA 98020 Phone: 425.771.0220 • Fax: 425.771.0221 • Web: www.edmondswa DEVELOPMENT SERVICES DEPARTMENT • PLANNING DIVISION July 5, 2018 Jesse Jarrell Western Engineers & Surveyors, Inc. Via email: jessej@wesi.co SUBJECT: NOTICE OF COMPLETENESS FOR SHORT PLAT APPLICATION LOCATED AT 20020 83RD AVE. W. FILE NO. PLN20180037 Jesse Jarrell, Your land use application for a two -lot short plat located at 20020 831d Ave. W. (File No. PLN20180037) became procedurally complete pursuant to Edmonds Community Development Code (ECDC) 20.02.002 on July 5, 2018. Please accept this letter as the City's completeness notice in accordance with ECDC 20.02.003. Although it has been determined that the application meets the procedural submission requirements and is therefore complete, additional information may be needed as staff continues with review of the application. Staff will contact you as our review continues if additional information is necessary. I will be the main staff contact for your application. If you have questions at any point during the review process, you may reach me at michele.szafran@edmondswa.gov or (425) 771-0220. Sincerely, Development Services Department - Planning Division Michele Q. Szafran Planner Cc: File No. PLN20180037 Page 1 of 1 ATTACHMENT 7