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Home My WebLink AboutBLD2021-00297 SFR - BLD Small parcel storm water management - 3/1/2021 1 Name L,Zt f l eu,i' Parcel# /,7Z21— ,f d Q3ZI BLD# 7.ZZ 'Q ,• Mason County C�/V� BUILDINGDepartment of Community Development Mq Small Parcel Stormwater Management Application/Worksheet (pW,l of 13 CY 'r Per Mason County Code, Title 14,Chapter 14.48 a stormwater site plan is required whenever a building application 4trOC,t made for residential development,or redevelopment',with more than 2,000 square feet of impervious surface 2. 'Redevelopment means,on an already developed site,the creation or addition of impervious surfaces,structural development including construction,installation or expansion of a building or other structure,and/or replacement of impervious surface that is not part of a routine maintenance activity,and land disturbing activities associated with structural or impervious redevelopment. 'Common impervious surfaces include,but are not limited to,rooftops,walkways,patios,driveways,parking lots or storage areas, concrete or asphalt paving,gravel roads,packed earthen materials,and oiled,macadam or other surfaces which similarly impede the natural infiltration of stormwater.Open,uncovered retention/detention facilities shall not be considered as impervious surfaces. Surfa ce Type Length X Width = Area *All dimensions in feet B uildings s 0 X O = 6ct� 2 X Z 9 = Measurements for buildings are taken at the X = SS perimeter of the farthest projections(example: eaves/gutters) X = Driveways IV �✓?' y X 20 = 60 X = Length of drive begins at the right of way X = Parking Areas 'v SD X "' ao _ 'nip X = Any paved, gravel or packed area per definition above table X = Patios/Walks 41 X 4/ LLA X = Any paved, gravel or packed area per definition above table X = Others X = X = If the total impem pus area of the,proposed site X = development is greater than 20.00 square€ t e Shall Parcel Stormwafer Site Plan is Required Total 1 ius Surfer Aroma(sure ca#all areas} If the Total Impervious Surface Area is LESS THAN 2000 Square Feet, please read,acknowledge and sign below. Based Upon the information you have provided a Stormwater Site Plan IS NOT required for this development activity. Owner/Builder/Agent Acknowledges that submission of inaccurate information may result in a stop work order or permit revocation. Acknowledgement of such is by signature below.I declare that I am the owner,owner's legal representative,or the contractor.I further acknowledge that the information provided is accurate and employees of Mason County are granted access to the above- describ roperty r review and inspection as may be required. Q X 'Iti L Owne gend ontractor(circle one)Date: If the Total Impervious Surface Area is GREATER THAN 2000 Square Feet,please read,acknowledge and sign the information provided on page 2 of 2. Page 1 of 2 Name Pii.V Parcel 47j� �� BLD# Mason County Department of Community Development Small Parcel Stormwater Management Application/Worksheet (page 2 of 2) Based Upon the information you have provided a Stormwater Site Plan IS Required for this development activity. Title 14,Chapter 14.48 of the Mason County Code(MCC)regulates compliance requirements for Stormwater Management in this jurisdiction.A complete copy of the ordinance can be found on the Mason County website: http//www.co.mason.wa-us/code/commissioners/index.htm Please follow the links to"Title 14,Chapter 14.48 Stormwater Management". Regulated activities shall be conducted only after Mason County Public Works approves a stormwater site plan (Mason County Code Title 14 Chapter 14.48 section 14.48.70).You will receive a copy of the Public Works document entitled "Managing Storm Drainage on Small Lots, The Small Parcel Stormwater Site Plan". This document will assist you in preparing the necessary information and plans for Public Works to review and approve. Per Department of Public Works this document will constitute an approved plan if all of the relevant details' are to be installed in their entirety AND no part of the stormwater system adversely affects any septic system(see Environmental Health information below). If an alternative system is to be used a plan will need to be submitted to Public Works for approval. A design by a registered professional may be required for more complex sites. *These details are found in the document Managing Storm Drainage on Small Lots, The Small Parcel Stormwater Site Plan on the pages that begin with"Handout" PLEASE INITIAL BELOW TO INDICATE THE STORMWATER MANAGEMENT PLAN FOR THIS SITE A)rThe relevant details from Managing Storm Drainage on Small Lots, The Small Parcel Stormwater Site Plan will be installed in their entirety AND the system will be located as not to adversely affect any septic systems on this,or any other,parcel. B)�An alternative plan and/or professional design will be submitted to the Department of Public Works for approval AND the system will be located as not to adversely affect any septic systems on this,or any other,parcel. If you have further questions pertaining to parcel drainage and stormwater management Mason County's Public Works Department can provide additional instructions, guidance and examples.(Section 14.48.130)contact Public works at: Phone: (360)-427-9670 EXT.450 Mail: P 0 Box 1850, Shelton WA 98584 Physical:415 N 6th St, Shelton WA 98584 If this development has, or will have,a septic/drainfield system you may need to contact Mason County Division of Environmental Health to ensure that the stormwater system will not adversely affect the septic system of this,or any other,parcel.You may also wish to consult with the septic design professional involved with the project. Mason County Division of Environmental Health can be reached at: Phone: (360)-427-9670 EXT. 352 Mail: P 0 Box 1666, Shelton WA 98584 Physical:426 W Cedar St, Shelton WA 98584 A condition will be added to the building permit that states, in part,that all conditions the stormwater site plan will be met prior to a request for final inspection of the building permit. Owner/Builder/Agent Acknowledges that submission of inaccurate information may result in a stop work order or permit revocation. Acknowledgement of such is by signature below.I declare that I am the owner,owner's legal representative,or the contractor.I further acknowledge that the information provided is accurate and employees of Mason County are granted access to the above- described propelty tf-orr-r-e�view and inspection as may be required. e X 'I'ti ! Owne Agent/ ontractor(circle one)Date: Page 2 of 2 TAHJA ENGINEERING, Inc. PO Box 235, Hoodsport, WA 98548 (360) 877-9512 Mason County DCD Planning Division 615 W Alder Street Shelton, WA 98584 Sean& Caira Lafleur 16605 1501h St.NW Gig Harbor, WA 98329 (360)417-8876 Re; Small Parcel Stormwater Site Plan(SSP)& Construction StormWater Pollution Prevention Plan (CSPPP) 142 E Victor Road Belfair, WA 95528 Parcel No.: 12221-43-90321 Mason Co. Case No.s: SWG2019-00252, WA12019-00063 Small Parcel Erosion and Sediment Control(ESQ Plan & Permanent Stormwater Ouality Control(PSOQ Plan Stormwater Site Plan (SSP) Narrative The Lafleurs are in the process of developing their property located at the above E Victor Road in Belfair, Washington. Roughly half of the 6.72 acre property is un-developable because of stream setbacks(165' either side of an un-typed stream)and hazard area slopes (>40% slopes). The easterly half of the property has been cleared of trees and understory brush and except for a cleared area where the septic system and residential features are planned the property is being kept in a pasture condition. Roughly 1'/z acres of the easterly portion of the property is currently kept as a pasture. The Lafleurs plan to develop the property with a residence, and attached garage-shop (2,542 sqr ft), and a horse shelter(14'x42' =488 so. The residence, driveway and parking areas encompass approximately 0.5 acres (21,490 so. With more then 2000 square feet of impervious surfaces (driveways,parking and rooftops), Mason County has required the Lafleurs to have a stormwater plan developed by a professional engineer. With half the property encompassing roughly 3.3 acres,the 21,490 sqr ft of imperviousness amounts to approximately 15%of the site. A large portion of the impervious area will shed runoff onto the planned pasture so the runoff from the parking and driveway area near the residence will bee filtered and treated before it is delivered to the rock lined swale. The proposed residence, shop/garage and other residential features are planned at the top of an easterly ascending slope. The hillside slope east of the crown of the hill has descending relatively modest slopes(—26%or less) and the hazardous slopes (>40%) are located approximately 160 feet east of the proposed development area. An un-typed stream is located roughly 230 feet east of the proposed development area. Because of the stream setback, the hazard area's 50' vegetated buffer is well inside of the stream 165' buffer which has been used as the allowable building restriction for both the stream and the slope restrictions. To reduce the volume of stormwater runoff delivered easterly towards the E Victor Road, it is proposed that roof runoff from structures located at the crest of the hillside slope be delivered to"level File:C.(Projects"leur SFMSSP-Rpt 1 of 2 2/18/2021 TAHJA ENGINEERING, Inc. PO Box 235, Hoodsport, WA 98548 (360) 877-9512 spreaders"located on the moderate slope(s). Stormwater runoff produced by the driveway and parking area(s)will be directed towards the existing stormwater ditch located along the southerly and westerly boundaries of the Lafleur property. The existing ditch is proposed to be lined with riprap rock (1 man rock& quarry spalls) including riprap rock check-dams installed on 30 to 50-foot intervals. Stormwater runoff from the property currently is discharged either east of the development area or is directed to the west and an existing ditch which relieves itself through an existing driveway culver located on the corner of the property and the E Victor Road. Discharging structure roof runoff to the east will diminish the runoff being discharged to the west and ultimately the E Victor Road and eventually Case Inlet, a quarter mile west of the Lafleur property. In order to prevent erosion and trap sediment within the project site,the following Best Management Practices (BMPs) will be used approximately as shown on the Erosion and Sediment Control (ESC) plan. • Clearing Limits will be marked by fencing or other means (ribbons) on the ground. • The driveway has already been constructed and is in use by the neighboring property. • Water will not be allowed to point discharge onto slopes,but will be tight line conveyed to level spreader trenches install in convenient locations near structure corners. • Silt fencing is already in placed along the lower edge of the pasture. The property has been logged and cleared under the"Moon"ownership in 2011. The Lafleur's planned improvements are primarily planned on the property in locations that are currently used for parking and driving areas and don't represent an appreciable change in the amount of imperviousness. Development of the property as the Lafleurs are planning will not impact neighboring properties or waters of the State. Please feel free to contact me if there are any questions or concerns regarding my findings or opinion. Sincerely, A 71 0 WA 30784 Off' �Ects�ER�9 0NAL Y, Alan A. Tahja, PE Attached; Small Parcel Stormwater Management Application/Worksheet 5 Sheet Residential Improvement Plan ESC Plan Sheet+County Silt Fence and Stabilized Construction Entrance Details Recommended Standard Notes for Erosion Control Plans Parcel Specific Geotechnical Report Addendum for LaFeur Planned Improvements File:C:WrojecWLajleur SFRISSP-Rpt 2 of 2 2/18/2021 N Conceptual 30x40 Structures; o W E Soil Probe Locations& Depth to competent soil 36" c O S N b• 77 1 tJ «NN.., o• b ar .._.. W d Area ne id g R d E� s>40%)� ,.�rl,, �•t� �5n t v F Sj tr1 a, 36' ; .. • i +( e # J ,n ,,t •>� fE i � ' ._'`__w pip j i 4)11 6 4 e �'� ' n' 00 I � �! cy i� • o o A + \ 30:: C l N N 8 i 00'VVeCn a a 30^ Radii . ac c g H s' 01 W cD WASX b SCALE: V=300' �� 0 100 200 3W ._ �0�1 SEC TER �� °� c SSIONAL��G c'' Rev# Description Date TAMA ENGINEERING,INC. SITE PLAN P*'°° Alan Tahja,P.E. Scan&Cairn LaFleur Lafluer PO Box 235 16605 150th St NW Hoodspo4 WA 98548 Gig Harbor, WA 98329 2 of 5 Mason Co.FrW No.:12221-43-90321 (360)877-9512 (360)340-6643 S_Lafleurl@msn.com WealaS Pa tun w 1 t o \ F , ry x„ r. p > G Ir' 3 _. ✓ Q r � :9,.� � ----�'__�'--�_ -_-.�___ �__ ✓ err /„/ '/�� j N•-. - — a� E / �D r' e 094 / G •..____.__� y �.._ ,._.... G __-- J' W o sOst J �. Ad- 0f�6 L t adoid —- "------------- DES cis � \ // / °� Oki Rev# Description Date TAHJA ENGINEERING,INC. CROSS SECTION"A" Alan Tahja,P.E. Sean&Caira Lafleur Lafluer PO Boa 235 16605 150th St NW Hoodsport, WA 98548 Gig Harbor, WA 98329 3 of 5 Mason Co.Picl No.:12221-43-90321 (360)877-9512 (360)340-6643 S Lafleurl@msn.com I � 8 O N bb I u " i i I I I i — N nod oaf 13p U — �t v, atit �� o I 140 ��'•"�'` �I p o i l i l i i � l i i i l ......._.. . os - - z o 110 oUO 480 170 _._..... ,.......�..� of „�•...,� ' I 06 0 80 a Z En _� II r 6° -80 W Q9` I /ram/ 150 � _.. I C4 a OEI o v o pF, Ow v Rev# Description Date TAHJA ENGINEERING,INC. DRIVEWAY&SWALE DETAILS Alan Tahja,P.E. Sean&Caira LaFleur suer PO Box 235 16605 150th St.NW Hoodsport, WA 98548 Gig Harbor, WA 98329 4of5 Mason Co.Prvl No.:12221-43-90321 (360)877-9512 (360)340-6643 S Lafleurl@msn.com 08L l a.� U o I I tn J � I i — i z s � 4 I OS L �._. cl 3 b � _ n O v�of w10, r �a b 6"dia. Solid PVC °�' ��GISTEVL Roof Gutter Drain Pipe& �SSIONAL E��l b Dispersion Trench Rock. oho k 1 N Jffim . SCALE: 1/4"= F-0" N h7 0 , z 3 4 feet Standard Erosion&Sediment control notes attached. - -- - - - Standard Silt Fence BMP C233 Attached. 00 Stabilized Construction Entrance BMP C105 Attached. C� b 4 to 6, cn I IT hick Riprap Rock g Stormwater Note; Containing stormwater silt&turbidity within the --- construction area is mandatory.Silt or turbidity detectable off-site is an infraction of Ecology and SCALE: 1/4"=1'-0" Mason County stormwater management regulations. i n 1 2 3 4 feet E Clearing & Grading Block; for County Use 1 ' Date Inspection Type Comments E OF WASx O" _ 0 l L b w IONAL Stl t E ; � 1� � Sto'rmwater Note; i g }1 Containing`stormwater 'it&tur 'dity within ei I V!1 1- t rj construction area is,man tory.Si orturNdily k 0 detectable off-site isAn in action o colpgy�0 Mason County Aorm�ater anagem f,egu t3o _ '` t -. y j �+ 1 Riprap Stabilized tZ 1 j d+40 on Entrance-Fiat c nstfucti activity.BMP C105 i ° '� ,S ` ,; eA w= L- BP C23 ; t i '' i 00 Silt jence, Slope 0 ►� I s i �, r � � {C) It Fen 0 E2313 Silt Fe \"fps "Call Before You Dig"is a legal requirement, ' yperimeter w reverstormwater-runoff has the potent Call 1-800-424-5555 a minimum of 24 hours SCAL�: 1',=$0' \ \ rior to excavatin \ 9f \ \ escaping the Lafleur property. P g• o 20 40 60 80