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CA Report.pdfwetland licieirce Wildlife ]l+Xology Landscape ,scape Architectiriire November 18, 2011 �11 Ms. Susan Little n � 2309 NE 127th Streete Seattle, WA 98125 RE: Little Edmonds Property — Critical Areas Report R.A.I. Project #2011-043-001 Dear Susan: At your request, Raedeke Associates, Inc. staff visited the Little Edmonds Property in Edmonds Washington on October 27, 2011, along with representatives of the City of Edmonds and the Washington Department of Fish and Wildlife. The purpose of the site visit was to identify environmentally critical areas and collect data for preparation of a Critical Areas Report (City of Edmonds 2011 a) suitable for submittal to the City of Edmonds. Our investigation is in response to the October 6, 2011 letter from the City of Edmonds regarding the permitting requirements associated with unauthorized work in the stream at 806 Dayton Street. The Little Edmonds property is a single-family residence on an approximately 8,200 square foot lot located at the southeast corner of Dayton Street and 81h Avenue South in the City of Edmonds Washington (Figure 1). Dayton Street forms the northern property boundary, 8th Avenue South forms the western boundary of the property. Single-family residences are found along the southern and eastern property boundaries. ExISTING CONDITIONS During the field investigation on October 27, 2011, I observed a single watercourse on the property. The watercourse conveys water from the southeastern portion of the property to a drop structure located along the southern property boundary, approximately half -way along the site boundary. Water enters the Little Edmonds property from the east via a cascade down a retaining wall located on the eastern property boundary. The watercourse had previously been piped from the base of a retaining wall along the eastern property boundary to the drop structure. Water enters a pipe in the existing drop structure and is conveyed westward below 8th Avenue South. The water was conveyed to the drop structure via a temporary pipe during my October 27, 2011 site visit. The City of Edmonds has visited the site and has determined that a State Environmental Policy Act (SEPA) checklist must be completed for the work in the onsite stream (Edmonds 2011b). 9510 Stmic Aileime M Seattle, WA 98103 206-525-11122 w��wroiim�ii;ili lit° ivammtt Ms. Susan Little November 18, 2011 Page 2 The watercourse is identified by the Washington Department of Fish and Wildlife (WDFW) as a non -fish bearing tributary to Shelleberger Creek (WRIA 08.0010) (WDFW 2011) and is considered to be a water of the state. Work in the stream will require a Hydraulic Project Approval (HPA) from the WDFW. The property contains no evidence of wetlands or habitat for endangered, threatened, sensitive species, or other priority species. I saw no hawks, eagles, great blue herons, or other priority species on the site, or in the project vicinity during the field investigation. The property is maintained as a single-family residence with landscaping (Figure 1). PROPOSED STREAM RESTORATION The property owner, Ms. Susan Little proposes to remove the stream from the current piped condition between the eastern property boundary and the existing drop structure and construct an open channel in the southeastern portion of her property (Figure 2). PROPOSED PLAN The open channel will be approximately 8 feet wide at top of bank and carry water westward from the base of the existing retaining wall approximately 37 feet to the existing piped outlet. The channel will meander along a 4 foot wide zone and the bottom of the channel will be approximately 2 feet below the existing ground surface. The channel bottom will be a combination of native soils and imported gravel in order to replicate a natural stream feature. Material excavated to create the stream channel will placed along the northern side of the channel to form a berm, preventing water from flowing toward the existing house on the property. The berm will be approximately 7 feet wide at its base and will be planted with a mix of native shrubs and ferms intended to mimic a natural riparian zone. The planted bern will serve to provide a buffer between the existing residence and the stream channel. Species proposed (Figure 3) are all native plants typically found along streams in the Pacific Northwest. The plan includes a 4 - foot -diameter concrete pipe section around the existing outfall in order to provide a stable and contained area around the existing outfall pipe. SITE PROTECTION MEASURES We recommend that the proposed work be conducted during the summer low flow period for the stream in order to minimize potential downstream impacts from construction. During construction of the restored stream channel, stream flow should be maintained in the temporary pipe from the base of the retaining wall to the existing drop structure in order to maintain a relatively dry work area. We also recommend that the contractor responsible for the implementation of the restoration plan install and maintain temporary and permanent soil erosion control measures during and after construction, consistent with best management practices, as required by the City of Edmonds, to limit the potential for sediment deposition or erosion in the stream. Ms. Susan Little November 18, 2011 Page 3 MONITORING AND PERFORMANCE STANDARDS After the stream restoration work is completed and the buffer berm planted, annual site inspections should occur to assess the success of the plan. For the first three years after construction is complete, site checks should occur to see that the new stream channel is not eroding and that the planted vegetation is surviving. Success of the plan will be determined by the stream flowing relatively free of turbidity in its channel and no significant down -cutting of the channel. Survival of a minimum of 80% of the planted species shall also be considered a success. LIMITATIONS We have prepared this report for the exclusive use of Ms. Susan Little and her consultants. No other person or agency may rely upon the information, analysis, or conclusions contained herein without permission from Ms. Susan Little. The determination of ecological system classifications, functions, values, and boundaries is an inexact science, and different individuals and agencies may reach different conclusions. With regard to wetlands, the final determination of their boundaries for regulatory purposes is the responsibility of the various agencies that regulate development activities in wetlands. We cannot guarantee the outcome of such determinations. Therefore, the conclusions of this report should be reviewed by the appropriate regulatory agencies. We warrant that the work performed conforms to standards generally accepted in our field, and prepared substantially in accordance with then -current technical guidelines and criteria. The conclusions of this report represent the results of our analysis of the information provided by the project proponent and their consultants, together with information gathered in the course of the study. No other warranty, expressed or implied, is made. Thank you for the opportunity to prepare this material for you. Respectfully submitted, RAEDEKE ASSOCIATES, INC. Christopher W. Wright Principal/Soil and Wetland Scientist Ms. Susan Little November 18, 2011 Page 4 10 10 DI :: 7 City of Edmonds. 2011 a. Chapter 23.40, Environmentally Critical Areas Chapter 23.40.90, Fish and Wildlife Habitat Conservation Areas. Edmonds City Code Current through Ordinance 3846 passed July 5, 2011. City of Edmonds. 2011b. Letter to Dave Maple regarding Permitting requirements 806 Dayton. October 6, 2011. 2 pages. Washington Department of Fish and Widlife. 2011. Letter to Ms. Susan Little regarding Unpermitted Hydraulic Activity, 806 Dayton St. October 11, 2011. 2 pages. 15 60 0 30 NORTH SCALE: 1"=30' ��5 M Stone Avenue North ,clatdo, WA 98 W3 EDMONDS, WA A 0 0, offeigglik gmus 1"T, 1. 1 HEW M111,290TOT I DATE: 2011 -11 -11 Base information: Source for mage: Google Maps. Mountain View, CA: Google Inc. (2009). Available from http://maps.google.com. Accessed 2011-11-9. NATIVE PLANTS EX. GRAI EX. WALL crO REMAIN) CHANNEL 2 8 %66" 0 4 <N)TM SCALE: 1"=4' W� 10 Stone Avemw Novd� W/k 98103 PROPOSED SITE PLAN 601 U4 WATU RAI PROJECT- 2011-043-001 JDATE-. 2011-11-11 0 W*111,12A_100 0 A —SLOPE RED —RESTO o CHANNEL 41M NOTES 1. INSTALL 2-3.'MULCH ON BERM, WHEN PLANTING IS COMPLETE, 2. PRUNE ALL DEAD AND BROKEN LIMBS AND ROOTS. 3. THE FIRST TWO YEARS THE INSTALLED PLANT MATERIAL SHOUL D RECEIVE 1 INCH OF WATER PER WEEK DURING THE HOT MONTHS (JULY- SEPTEMBER). ��510 S�one Avenue North Seatfle, WA 98103 UNER17ED 3 (typ) LL PLANTS AT NURSERY (TYP) )T5' LE MULCH CH WOODY STEM5 OLE AS DEEP AS SHRUB & AS WOE, GRADE 1E CONTAINER COMPLETELY E BACKFILL SOIL No WITH 25X APOSED ORGANIC MULCH AWhODMENT UNDISTURBED SUBGRADE nRM BASE SO (PROVIDE OTIDEOSTBALL WILL NOT SINK) DATE: 2011-11-11 PM: CW DRAWN BY. AC PLANT KEY Scientific Name Common Name Size Qty. Mahonia aquifolium Oregon grape 1 gal. 3 0 Ribes sanguineum Flowering currant 1 gal. 3 Rosa nutkana Nootka Rose I gal. 5 Polystichum munitum Sword fern 4" cont. 13 41M NOTES 1. INSTALL 2-3.'MULCH ON BERM, WHEN PLANTING IS COMPLETE, 2. PRUNE ALL DEAD AND BROKEN LIMBS AND ROOTS. 3. THE FIRST TWO YEARS THE INSTALLED PLANT MATERIAL SHOUL D RECEIVE 1 INCH OF WATER PER WEEK DURING THE HOT MONTHS (JULY- SEPTEMBER). ��510 S�one Avenue North Seatfle, WA 98103 UNER17ED 3 (typ) LL PLANTS AT NURSERY (TYP) )T5' LE MULCH CH WOODY STEM5 OLE AS DEEP AS SHRUB & AS WOE, GRADE 1E CONTAINER COMPLETELY E BACKFILL SOIL No WITH 25X APOSED ORGANIC MULCH AWhODMENT UNDISTURBED SUBGRADE nRM BASE SO (PROVIDE OTIDEOSTBALL WILL NOT SINK) DATE: 2011-11-11 PM: CW DRAWN BY. AC i i m i.zv i i .ausanLlLue.ivialiLisL.)vvr iAuJ i axrarceis.gi-yLaoeisjjisunct.xis rage i or 4 qryLabelsDisfinct� A B C I) � ..7" 1_ F 11/08/20117771— da«, Project: Mail�� �:"'�• List of Owners/Tax Parcels within a 300 Ft. Radius of Subject Tax Parcel 1 00434207600100 2 Requested by 3 Susan Little Tax Parcel # Owner/Taxpayer Name Address City State Zip 4 Code OYAMADAI 2-14- SETAGAYA- 00434207702500 THOMAS GARY M & MIYOKO S 10 KU 158 5 TOKYO VAUGHN 812 MAPLE 00434207500300 JONATHAN ST EDMONDS WA 98020 6 PO BOX 00434207500700 HARDAN CAROL B 1508 EDMONDS WA 98020 7 830 DAYTON REULE DELYLE EDMONDS 00434207600900 F STREET WA 98020 8 840 DAYTON 00434207601100 MACDONALD SUE & EDMONDS ST WA 98020 JOHN 9 842 DAYTON 00434207601300 LOWELL DELL R & EDMONDS CAROLE ST WA 98020 10 837 MAPLE 00434207602500 HERMAN DOUGLAS J & EDMONDS ST WA 98020 DEBRA W 11 817 MAPLE 00434207603200 FELIBERTI VALERIE A ST EDMONDS WA 98020 12 221 8TH AVE 00434207603600 WHITLOCK NEAL & EDMONDS LISSA S WA 98020 13 00434207700102 CCOATES DONNA 103 8TH AVE EDMONDS WA 98020 S https://mail.google.com/mail/?ui=2&ik=94d540947O&viev,M=att&th=1338ff4c07cff51e&a... 11/23/2011 i.ui.2ul i.ausanLittie.iviaiiListsuuPlAaj iaxrarceis.gryLaneisliisunci.xis rage z 014 14 812 MAIN 00434207700300 PELTZER RUTH B ST EDMONDS, WA 98020 15 824 MAIN FALCONE MICHAEL EDMONDS 00434207700800 S ST WA 98020 16 830 MAIN 00434207701000 RUDOLPH EDMONDS CAROLYN ST WA 98020 17 837 DAYTON 00434207702700 SNYDER THOMAS M ST EDMONDS WA 98020 18 825 DAYTON SANDY WALTER EDMONDS 00434207703300 GARRY ST WA 98020 19 777 MAPLE 00434208901400 JOYCE EDMONDS ST WA 98020 ARNOLD 20 752 DAYTON WERMUS EDMONDS 00434208901700 JOSEPH ST WA 98020 21 777 MAPLE 00434208902300 JOYCE EDMONDS ARNOLD ST WA 98020 22 760 MAPLE 00434209001500 KEENAN ROBERT & EDMONDS KAREN ST WA 98020 23 310 8TH AVE 00434209001900 JOHNSON KIRK & EDMONDS SAVAGE VICKI S WA 98020 24 820 MAIN 00434207700500 BUSLACH KRIS ST EDMONDS WA 98020- 25 A 3034 250 5TH AVE 00434208800000 EDMONDS CITY EDMONDS 98020- OF N WA 3146 26 806 DAYTON 00434207600100 LITTLE SUSAN EDMONDS 98020- MARIE ST WA 3337 27 814 DAYTON 00434207600300 HAUSE EDMONDS 98020- RUSEL ST WA 3337 28 00434207600600 ZIMMERMAN JOHN LE 820 DAYTON EDMONDS 98020- & KRISTINE A ST WA 3337 https://mail.google.com/mail/?ui=2&ik=94d5409470&view=att&th=1338ff4c07cff51 e&a... 11/23/2011 i imI.Lui i.�usanl,itue.maiit,istJUUrttiaJ laxrarceis.gryLaneisuistmct.xis rage S of 4 29 30 00434207702900 CLOS ROBERT B & CAROL M 831 DAYTON ST EDMONDS WA 98020- 3337 31 00434207703500 JEFFERS ROBERT C 815 DAYTON ST EDMONDS WA 98020- 3337 3 2 00434207703700 GUSKIN ALAN E/LASHELL LOIS M 805 DAYTON ST EDMONDS WA 98020- 3337 331 00434207500100 CARLSEN ERIC & JANET AB LIVING TRUST 808 MAPLE ST EDMONDS WA 98020- 3338 34 00434207500500 COOPER JAMES M 820 MAPLE ST EDMONDS WA 98020- 3338 35 00434207500900 CRABB KATHY D 832 MAPLE ST EDMONDS WA 98020- 3338 36 00434207602700 CRABB JERRY E & KAREN S 835 MAPLE ST EDMONDS WA 98020- 3338 37 00434207602900L SCHMIDT ROBERT 825 MAPLE ST EDMONDS WA 98020- 3338 38 00434207603400 SWEENEY / GROTHEER 815 MAPLE ST EDMONDS WA 98020- 3338 39 00434208901900 CHESHIRE JAMES 201 8TH AVE S EDMONDS WA 98020- 3430 4000434208902100 SULEWSKI KRZYSZTOF 210 8TH AVE S EDMONDS WA 98020- 3430 41 00434208901200 CATTON SCOTT 736 DAYTON ST EDMONDS WA 98020- 3433 42 00434209001700 KNELL MARY A 770 MAPLE ST EDMONDS WA 98020- 3436 23632 HWY 99 00434207703100 BRAINARD LAWRENCE & MARILYN STE F EDMONDS WA 98026 43 ISANDVIK DAVID & IPO BOX KIRKLAND https:Hmail.google.com/mail/?ui=2&ik=94d5409470&view=att&th=1338ff4c07cff5 l e&a... 11/23/2011 l i m /.2ui LJusanLlttle.maiILlst.JUUPtAQJ l axrarceis.gryLabeist)istmct.xis rage 4 of 4 https://mail.google.com/mail/?ui=2&ik=94d5409470&view=att&th=1338ff4c07cff51 e&a... 11/23/2011