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Preliminary Plat of Cedarwood
PRELIMINARY PLAT OF CEDAR WOOD LEVEL ONE DOWNSTREAM ANALYSIS September 1995 � I 3i 7 Prepared for: Cedarwood Group �apzaas 9iisi a F IfLIs�li 6. Go ldSi»itli s()ciiiI("s. lit y 4' > Purpose and Scope The purpose of this report is provide a conceptual plan for the management of drainage on the proposed Cedarwood project and to fulfill the requirements of a Level One Drainage Analysis as outlined in the K.C.S.W.M. Manual Section 1.2.2. Synopsis In the existing condition virtually all runoff from this site is discharges directly to the Cedar River. It is proposed that after development runoff from the developed portions of the Cedarwood project site will be collected and directed to a new water quality facility and then discharged directly to the Cedar River utilizing an existing WSDOT outfall to the river. The size of outfall will be enlarged to accommodate runoff from the site. The Cedar River is designated as "A Receiving Water" by the King County Surface Water Design Manual (page 1.2.3-6). Therefore, after water quality treatment, direct discharge of stormwater runoff, without detention, from the Cedarwood project to the Cedar River is permissible. Task 1: Study Area Definition and Maps Project Description The site is located in the Cedar River valley about 21/2 miles east of Renton at the intersection of SR-169 and 140`h Way S.E. The site is about 1 mile north of the Fairwood Golf Course. A vicinity map of the site is shown on Figure 1 and an overall site map is shown on _ Exhibit 1. The current development proposal is to construct 146 multi-family condominiums and 96 single family lots on the 73.5 acre site. The current development proposal contains no commercial uses. Development on the site will be clustered on about 32 acres in three separate areas as shown on Exhibit 1. Project Statistics: Total Site Area: 73.5 acres Sensitive Area & Buffers: 36.5 acres Net Buildable Area: 32.0 acres Proposed Uses: 96 Single Family Lots (in two clusters) 146 Multi-Family Units (in one cluster) Runoff from all developed area on the site will be collected, in a closed conveyance system, and directed to a single new water quality treatment pond to be located along the north boundary of Tax Lot 13. Tax Lot 13 is a contiguous parcel under the same ownership as The Plat of Cedarwood. The water quality facility will be located in a permanent easement within Tax Lot 13. After water quality treatment, runoff from the site will be discharged directly to the Cedar River. The existing WSDOT outfall to the Cedar River will be enlarged and utilized for the site's - discharge to the Cedar River. r94057w.354 Page 2 HGG Inc. September 22, IQ95 Hugh G. Goldsmith d( Associates, Inc. The new water quality facility will discharge to a new manhole to be constructed on the existing 18" CMP outfall approximately 80' downstream of the existing manhole with the bird cage top. The existing 155' of CMP downstream of the new manhole will be removed and replaced with 36" concrete or N-12 pipe, and the existing rock-lined outfall to the Cedar River will be utilized (see Exhibit 2). Drainage Basins A map showing the site in relation to regional drainage features is shown on Figure 1. The,site is located just south of the Cedar River, between Molasses Creek and Madson Creek. SR-169 forms the north boundary of the site. From a regional perspective the entire site is located within the Lower Cedar Drainage Basin and drains to the Cedar River. From a local perspective the site is divided into two sub- basins: 1) Madson Creek Sub-Basin and 2) Direct drainage to the Cedar River. Sub-Basin boundaries are shown on the Conceptual Drainage Plan, Exhibit 1, attached. Madson Creek Sub-Basin IJ Madson Creek flows across the eastern edge of the site. About 18 acres of the site is located within the Madson Creek Sub-Basin. All but 1.5 acres of this area is classified as sensitive areas and is proposed to remain undeveloped. Most of the area of the site within this sub-basin will be placed in a sensitive area tract. Cedar River Drainage Basin Most of the site, about 55 acres, drains directly to the Cedar River. This area is divided into two sub-basins: sub-basin "A" and sub-basin "B". The locations and boundaries of both sub-basins are shown on Exhibit 5, The Conceptual Drainage Plan. Sub-Basin "A" About 15 acres of the site, primarily from Tax Lot 25, is within sub-basin "A". Sub-Basin "A" is defined as the area which drains to the dual 24 inch culverts under SR-169 at the east boundary of the Cedarwood site. Runoff from this sub-basin eventually flows into a pond located on the Maplewood Golf Course and eventually into the Cedar River. Sub-Basin "B" The majority of the site, about 40 acres, is within sub-basin "B". Sub-Basin "B" is defined as the area which drains to the existing WSDOT road ditch along the north boundary of Cedarwood. Runoff from this sub-basin eventually flows into an existing WSDOT water quality pond which discharges directly into the Cedar River just south of the existing road bridge. The existing WSDOT outfall consists of 12 inch and 18 inch pipes (see Exhibit 2). Topographically the northern portion of the site is grass pasture. This bottom portion is flat and drains to two wetlands along the base of the ridge, and thence easterly to the Cedar River. r94057w354 Page 3 HGG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. The ridge rises steeply to the south, with slopes ranging from 20% to 100% and is heavily timbered. There are two areas on the ridge that have been mined for sand and gravel in the past. These areas are moderately sloped with grass and brush ground cover. 1 i 4 R t �S t I i r94057w.354 Page 4 HGG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. rA.rcar g ough waat�r I 7 1 r'rIll f dal' ,�-i� .I 1. � .- — `>•a / �; 1 �is �_� ���(-!����', �1•rC% au .� :..�' '� f _ � 1 ••�-coal c,.:�•I t: ,` ( . _•fitt•�- ��. .:;• � L .� L. .. 1_ , � �• �;4,,�..••` ; 10 LA , .4,2eb WASHINGTON -s a - �_.� _ -... �•. -- 5 -T Y i ,. i• -r. ` '`Washl I on ., s lln�pt`Ort. f3b ��21 bj `... ` Fit" , r 130 _CE gRalV ER lei 11b., a ' BEEN CEDAR RIVER - SITE tack RI .r r -► by 1�`t'L' SR 169 �1• II _ MOLASSES •c. CREEK 7-1 MADSON CREEK Wetlands 0 wetlands Duwamish 4 Open water �til aa� Basin Boundaries Sub-basin Boundaries 0 HughGQoicLcAnith &A-SSOC t e&IIIC• . Fic��>IrP 1 0 0 P o V. Y Q f.tr V, " RENTON — MAPLE VALLEY HWY. (SR 169 t 0 VICINITY MAP NO SCALE R� PQ 0 EXIS TING EX. WSDO T POND - 5v REPL ACE EXIS TING 48"� SDMH-B/RDCA GE TOP\ �E /8 CMP WITH RIM = 78.4 5 OR\0 3 6" C ONC. OR N-/2• lE /8" O U),. GO1AC. OUTFACE 36" CONC. '` { lE /2"lM'= 74.32 _ /Q -� —� - ~ W 48�"SDMH RIM = 84.80 eo lE /8 �" 73.30 t lE 36 = 7/.80 �%/ � \` &0 !8" CMP @0.69� iEf 74.36 \ 'g _ _ _ J ,� _ _ — EX. 235 LF — — — _ — —r- " p 00.69% „ C�u f o -rOE l5 = _ — — — EXl T. 80 L F 18 v 2 F 2 r _ _ 3 C) DMH-L/8 L O ED '` TOP _ rn CL 2' WIDE SWALE x r TOP 'HO G _ CL 4' WIDE SWALE I H'/R FENCE r OUTFALL 18" CMP /E = 72.2/ oF\\� �.. �......._ -_...- TL 13\ -_.. _. .-_-- SR /69 R.O.W.x \... so J 0 10 20 30 40 60 1 PROP. WATER OUA L I T Y POND .w, pCTC DC*CwTM C -TC xswrn, NAM. .C.LLL f•20' LENNON YfVESTMENTS 84067,oe.a 0 Hugh G. Goldsmith & Associates, Inc. og 4 e EXHIBIT Cosulting bginem • SmTMra • Planners °"° '^�^` Q ��a a� � DOWNSTREAM ANALYSIS 1z16 ll4lII b.au. 86 Tom, CEDARWOOD 2 PA. am 5666 �t (7Bt)td!-10W v, iu Hei1noe,1A 06000 nTU 206 462-7718 •c+o ors:s.osrzo. KING COUNTY WASHINGTON Task 2: Resource Review The following resources and documents were reviewed in preparing this analysis. Maps from the reports deemed pertinent have been included in appendices as shown below. 1. Basin Reconnaissance Summary Report . . . . . . . . . . Appendix A ij 2. Sensitive Areas Folios . . . . . . . . . . . . . . . Appendix B 3. King County Wetlands Inventory Maps . . . . . . . . . . Appendix C 4. USDA SCS Soils Survey . . . . . . . . . . . . . . . Appendix D J. FEMA Maps 6. SWM Division Drainage Investigation Section Problem Maps. 7. Hugh G. Goldsmith field survey and hydraulic analysis of downstream system. Information provided in the appendices is discussed in Task 4. F c e 4 e r { ..i r94057v,.354 Page 7 HGG Inc. Sentember 22. 1995 Hash G. Goldsmith & Associates. Inc. Task 3: Field Inspection/Task 4: System Description A field topographic survey of the downstream system was conducted by Hugh G. Goldsmith & Associates, Inc. on August 24, 1995. The results are shown on Exhibit 2. An inspection of the site drainage features was conducted on August 25, 1995. The weather was sunny and warm. The drainage features along SR-169 were observed to have no signs of any existing or potential drainage problems. No indications of overtopping, scouring, or sedimentation were observed at any of the culverts and catchbasins. No erosion or scouring was observed at the existing outfall into the Cedar f River. The WSDOT containment pond and outfall features were also observed to have no signs of any existing drainage problems as well. The containment pond is approximately 400 feet in length and has a varying depth of 3 - 4 feet. The pond is also heavily vegetated. The outfall consists of a 32 foot - 12" CMP that discharges to a 48" manhole, then continues through a 13 foot - 12" CMP that discharges to a 48" manhole with a bird cage top that provides as an overflow for the containment pond. This manhole then discharges directly to the Cedar River through a 235 foot - 18" CMP (see Exhibit 2). J 3 t C r94057w.354 Page 8 HGG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Surface Water Design Manual, Core Requirement #2 Basin: Cedar River Drainage Basin Subbasin Name: Sub-basin "B" Subbasin Number: Drainage Distance Observations of field Drainage Component Existing Potential Symbol Component Type, Slope from site inspector resource reviewer, Description Problems Problems Name, and Size discharge or resident T sheet flow,swala, a?rstruct ons irnd.of capacity,Pon di Type: drainage basin,vegetation cover,depth 0vartop&� ,bo&g,habitat or organism tributary area,likelihood of problem,overfbw see map stream,channel,pipe,pond; 9'b 114 mi=1,320 ft Size:diameter,surface anaa tiPe of sensitive area;volume destruction,sooUring,bank sloughing, pathways,potential impacts, sedimentation,incision,other erosion Site Discharge Location 0 12„CMP Pond discharge to manhole 0.3% 32' none under capacity No erosion exists 12"CMP Pond discharge from manhole to 48„ 0 3% 13' none under capacity No erosion exists manhole with bird cage top 18"CMP Discharge to Cedar River 0.69% 235' none under capacity No erosion exists r9-1057vv.354 Page 9 ttcG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. Task 4: Problem Screening The King County Basin Reconnaissance Summary Reports indicates that there are no drainage problems within the Cedarwood project site. The nearest problems are reported within the Molasses Creek corridor. None of the Cedarwood preliminary plat is located within or drains to the Molasses Creek sub- basin. ?1� The WSDOT containment pond outfall capacity is limited by the 18" CMP and it does not have the potential to accommodate the stotmwater flows from the new Cedarwood preliminary plat water quality facility. Due to the close proximity of the Cedar River to the Cedarwood project site, the 100-year floodplain was verified in the field by survey, using the flood elevations determined by FEMA (see Exhibit 3). Field cross-sections of the Cedar River were gathered by Hugh G. Goldsmith & Associates, Inc. and these were used, in conjunction with the FEMA floodplain elevations, to determine the actual extent of the 100-year floodplain. None of the site is within the 100-year floodplain. J s c R .P !Y r94057w.354 Page 10 HGG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. Task 5: MitiZation To accommodate the runoff from the developed Cedarwood site the existing WSDOT 18" CMP outfall pipe must be enlarged to a 36"concrete pipe. This enlargement will provide an increased capacity from 4.73 c.f.s. (18" CMP) to 39.58 c.f.s. (36" conc.). These capacities were calculated using Haestad Methods Design Software. The 36" culvert was analyzed for gravity flow and backwater conditions assuming the 100-year flood in the Cedar River (see Appendix E). The required capacity of the proposed outfall pipe was calculated using Waterworks Design Software using a 100-year, 24-hour design storm scenario and assuming total development of the entire { contributing basin. The entire contributing basin will generate a 100-year, 24-hour design storm runoff flow of 26.83 c.f.s. (see Appendix E). SR-169 and the existing WSDOT drainage channel along SR-169 (see Exhibit 1) and its tributary drainage area will produce a 100-year, 24-hour design storm flow of 4.06 c.f.s. Therefore, the total runoff from the tributary area of the proposed 36"concrete outfall pipe is 30.89 c.f.s. Accordingly, the 36" concrete pipe with a capacity of 39.58 c.f.s. was chosen to accommodate this flow and provide a factor of safety. ;r r94057w.354 Page I l HGG Inc. September 22, 1995 Hugh G. Goldsmith & Associates, Inc. 7 Appendix A Ring County Basin Reconnaissance 77 Summary Report 4 ,\\`.yrM`w wl+r+•�. _ »-x� —._--. r...-*r.,t.�—^ . t�Mp�f—. ,. --- - lC M t! VA • t . _�; _;' " S LOWER CEDAR RIVER BASIN ' •1:•' Basin Boundary 1 >; (:•u1irW \r Subcatchment Boundary Collection Point Stream 0299 Tributary Number *3115 Proposed Project o t 2 Miles cola �, 0:1 — ' July,1987 19 3105 Syr Q..•." e 109 �' : w �' iY• 3117 ` - UN If;7;1�,: f 3121 ' i• p {. :.3118•s� •,� .. "s 1, T "_ z,.„ - r. 3122 1 ! f p3 21 CP 0 3115 \ `<' , , .. i r i die ;.• _ 00 71 12 c - n_. ' 311 N. ��' 1.v ll.11 ... ' .I I • ' .. ilr_ s i "�4 `' � � �_ APPENDIX A ESTIMATED COSTS: PROPOSED CAPITAL IMPROVEMENT PROJECTS LOWER CEDAR CREEK BASIN Project Collect. Estimated Costs Number Point Project Description Problem Addressed and Comments 3121 Secure easement to wetland and con- Addresses increased flows in Trib. $371,000 (Welland O .-0 struct a containment berm and concrete 0304 and 0'04A from residential 3102) weir at outlet. Project should be developments. justified by a basin plan. Wetland rated #2. Biological assessment is needed to assure that this project does not decrease habitat values. 3122 11 Purchase existing ponds on Fairwood Mitigates flooding and erosion $342,000 Golf Course and expand to provide downstream. greater flow detention. Project is independently justifiable. P:LC.APA A4 ::J l PE1'dL7TX C DETAILED FINDINGS AND RECOMMENDATIONS LOWER CEDAR RIVER BASIN Trib. & Collect. Existing Anticipated Item River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 5 0299 13 Geology Horse farm in uplands has Continued high erosion and Develop R/D at horse farm RM 12.1 created extensive imper- sedimentation. to attenuate peak flows. vious surfaces, resulting See Project 3115. in channel scour, bank erosion, landslides, and sedimentation at mouth of basin. Residence overcome with sediment. G -- 13 Geology Landslide terrain for sale Site of future mass erosion. Prohibit development here. by realtors. High risk for Notify Building and Land landslides, flooding (from Development. Add area to �� springs). SAMF. 7 -- � 7 J Geology Large-scale landsides Natural process. None. �� adjacent to Cedar River due to springs and cutting of toeslopes by streams. Appears to be natural. 3 -• 2 Geology Gullying in valley wall, Unknown. None. possibly from natural springs. 9 — 14 Geology Landslide debris flow from Existing tension cracks Revegetate hillslope with residence on SE 147th Pl., indicate future instability. trees and shrubs. Renton. ': LC.APC C-2 APPENDIX C DETAILED FINDINGS AND RECOMMENDATIONS LOWER CEDAR RIVER BASIN Trib. R Collect. Existing Anticipated Item River Mile Point Category Prop. Proj. Conditions and Problems Conditions and Problems Recommendations l 27 0304 O Habitat Landslides contributing Sediment will continue to Maintain riparian corridor RM .40 sediment to channel. Heavy enter system until landslide with setbacks at least 50' deposition in pools, at stabilizes. from tops of banks. obstructions, even in riffles. 23 0304 3 Habitat Horses have access to Further decreases in water - Encourage residents to fence RM 2.10 stream, causing some bank quality, bank erosion likely. channel back 15' from ordinary deterioration and possibly high-water mark. affecting water quality. - Limit access to livestock to one or two points along stream. 29 0304 3 Hydrology Flooding caused by failing Problem will continue until - Problem referred to Main- RM 2.30 R/D at 176th St. R 146th outlet structure'is tenance section of Surface Ave SE. modified. Water Management Division. 30 0304 3 Habitat Encroachment occurring Wetland likely to be - Require encroaching fills RM 2.40 along all boundaries of reduced slowly until it is to be removed. this headwater wetland. completely destroyed. Loss - Establish specific buffer of storage, filtration, around this wetland. organic production, and - Enforce sensitive areas wildlife habitat. ordinances and regula- tions. I 0304 11 7 ) Geology Several gullies due to Problem will continue. - Tightline drainage. RM .30 �� daylight culverts; a few have recent landslides. ': LC.APC C-6 ..Aa(<.r..w 'i..-..,,:y, f ,,.....,i pb...'.i :•...._.._I :e.n.,:.� .� :-r,•I T1 I":. . •i+� w._ _ .._... +:L+{ilT1i31AFcG;`as , WAN W& APPENDIX C DETAILED FINDINGS AND RECOMMENDATIONS LOWER CEDAR RIVER BASIN Trib. & Collect. Existing Anticipated t Item River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 32 0304 0Habitat Extensive riffle (to RM Gravels risk becoming - Enhance habitat by addi- RM .00 .15. Creek channeled. No cemented. Few resting areas tion of woody debris in woody debris, little bank for upstream migrating fish. stream. vegetation. Steelhead, - Revegetate bank. �� coho spawners here. - Enhance pool/riffle ratio. 33 0304 ( 7 ) Habitat Debris jam may be a Debris will continue to - Selectively remove debris RM .20 �/ partial migration barrier. accumulate. Channel will to allow fish passage. likely divert or jam will - Stabilize large woody fail, releasing accumulated debris. sediment. 34 0304 7O Habitat Debris jam. Bed drops 3' Debris will continue to - Selectively remove debris RM .62 over jam and sediment, accumulate. Channel will to allow fish passage. forming anadromous likely divert or jam will - Stabilize large woody barrier. fail, releasing accumulated debris �� sediment. 36 0304 ( 7 ) habitat Water turbid; oily sheen Water quality will continue - Educate residents about RM .80 \� and odor present. Storm to decline as runoff and how to maintain water quality. drains empty directly.into waste enter stream. - Mark storm drains with stream. "Dump no oil" signs. - Emphasize recycling of oil. 37 0304A O Ilydrology 3102 Existing forested wetland Additional storage could be Construct a proportional weir RM 1.30 provides detention for utilized by constructing and berm at wetland outlet. Trib. 0304A and 0304 in berm and weir at outlet. Project could be used instead heavily developed area. This could be done to atten- of Project 3107 to rpeserve the uate increased peak flows #1 rated wetland (where project as upstream area develops. would be built). ': LC.APC C-7 Appendix B King County Sensitive Areas Folios A EE: WIN Olot �`�� life wool sill 1 aa. C'�lf�ll `�lli sl �► +� � a �O � .+ry.w..�i H� wimp re 1w5t ZINC a� EAMON .� • mid @ all line moll it 11K �Il�i■1012it oil �'*-� ,.� ►� MIwo 01 Ps It III 11171 ;.�� tell , v >a�. ! �. 1 • �w HER 41 Nil 7: r \ U1 iF RTr xpnoo gg I► ili�� _ it • d+WfTW � „ Ego • Ala Mi P. � r ry log VIA alumna IM low kills long guse Nil od D � aia1Et �3a3g_g 1► ,e t �► � ► � I( \ .� I Eta mods ER itim Art win 1Aw OF t OR MIN JOIN !VAIIJ�d■ � ���n ONE% Ills VIA AA .409 UP .1. 0 !pill row !alai VINOD �illii►161� i�rilflip MOSS�y � Ileiltl la Ism � DO I ow 1111•rii90uA' �: • ' . 4. a two4 �� M ■ 4r y f � aKai will manna mills •ft111Y' ci11 u�s, � � •�, 1�, . ._ictums in i1'dd� ti INS P • � `it� 31Asa a �►t y/1 9■�■ \ wt "awe � I ► jy ram,$ t� OWNARM 4111C=4, Nq �TM - ,� , ���'':�'`•'�,a�'"'eilr�RE�•►i ��a�a�a�/w.1�1®��� � ��� �� Hof �� ��'�► IVA . � ; ��(���:�r +lr:�. • ..� ,� �� l�� �����=�tts� IDS �'°tt� !� ■r ! Edl�raN� � {. � iiNlfl��fl9f.� �ap r_ UPC .t11lift12 •, �11 1 gall hP -laws L4w MWMMMA ®' � WIfLi VAww � b: � ' . n"` " ,• II � t�rwpb ��,� fVA all W s t .. lh.lti �, �l��1111� Ao \ r.� w\w M,. �s�aaA ',; a 115.Ii�6rR�;i��. M c�`` �lys h ...4# 'r �«.0 �II,�� ► r ►l+e�c o ��.� RGONr Us . T, �Ili� d�� ��� �' ;,�s��;;��"u�'�� 'gad• � L. , IVA rpm aim t�, ,Irailt»t�lijrTlbO �. II ,� ; _ . ��� � �� `���I�i 7R R+► � ei fiillirr��•,...�1,. FA .fir.:. �,r.. �,,,.R .r�v!Y• ^ ,. •:v-..� ..�-^ moo spa URI all ►, gap- a mom NOR �,►. . '. =wa" .�wwnr i ' � r �u 131 NO sin Iffin last IKIWwA� ilk Oft .1jdw?t�� l��� �='�:o yea:1t! ,� s �� 1 Nro�V� .. ; �e�� � •�:�ESE, � © ( �o a ��_������ �'���` :7MEE �4; Appendix C I �y King County Wetlands Inventory Maps h zfz 3et7 Ra���r:. o .p'i'ry a ,�. 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'U "., 4 �._C�"�M •r r -l'.:•�et $•-i', Ak zj. �► ' Wit_ ? ^�,�„� \� ,�, :.. • 1 1 Photo Date: 05/01/80 Inventory Date: 07/22/81 N A Scale: 1"=200' WETLAND: Lower Cedar River 3 COMMUNITY PLAN AREA: Soos Creek LOCATION BASIN OR (S,T,R):SE-NW 22, 23N, 5E DRAINAGE: Cedar River NE-SW 22, 23N, 5E 7 ACREAGE: 2.0 SENSITIVE AREA MAP#: 9 CLASSIFICATION: Fish & Wildlife Service Common Name PEM1 Palustrine Emergent Persistent Shallow Marsh (Cattails) a PF01 Palustrine Forested Broad-leaved Forested Deciduous (Alder) NOTE: Wetland boundaries shown are approximate. Further field studies are necessary to confirm the actual delineation 0: the wetland according to the Federal Nfanual for Identifying and Delineating Iurisdictiatal Wetlands. Lower Cedar River 3 OBSERVED SPECIES (refer to Appendix 1): Trees: AR TS TP Shrubs: AC Herbs: LA RR TL Sedges/Grasses/Ferns: EH SMAF CX JE Birds: VS BS AR SS Mammals: Fish: Other: HYDROLOGY: 1 Inlet: Type: Condition: Outlet: Type: Overland undefined. Condition: Not observed. Outflow enters: None. Water movement through wetland: Observed water quality in wetland: SIGNIFICANT HABITAT FEATURES: I GENERAL OBSERVATIONS: 1 WETLAND RATING (see Introduction for criteria): 2 field visits. Further field studies are necessary to obtain a complete list NOTE: Species listed are only,those observed during including rare, threatened, and/or endangered species. S a Appendix D USDA SCS Soils Survey Map ,/ 10' 1 680000 FEE1 J AkF (Joins sheet 5) •AmC i ISSAQUAH f?Arf. aft D 17 rl �i :'U , y • tI AMC f, 7 •�' �•: Higti'an t i t e L�� '`4f >y° • rY - i '• i Sch ' J i t: s :, ° a�rtr .j�., ;fir AMC j .. •f �d�'i t f.t� edt '�• 'J • i:: • 7w• "T• L a.i.���y .• r .. K •1■ i,ti 4.� i� 'f+b > 1 w ti..:.. e n W •• Y>y ; `�•• 't.n F.. B� •815 '1 _ t R Q� �•. i &�1��•'� - 'tit t .w •�! .. t 4.: t`�\`St 4 ��• s�• r' .1. �"r'• j r:r ;.r. 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Backwater analysis conducted on the new 36" culvert using Hydra Design Software, assuming a 100-year flood on the Cedar River and a 100-year/24-hour design storm flow (page E7). A ., a. 1 k i i, y� M .� Hugh G. Goldsmith & Associates, Inc. SBUH HYDROGRAPH INPUT DATA SHEET Drainage Basin Developed Basin A Sub Basin No. PERY[QUS .. ..... . 5CS $Ott:TYPE -#1l�[E?........... CN AFI A B i 1 C Res. 3.8 DU/Ac. 86 6.26 y= Res. 5.2 DU/Ac. 86 5.45 Multi-family (East) 86 3.32 Multi-family (West) 86 3.91 76 17.43 D Wetlands 81 6.2 PERVIOUS Weighted CN = 81.2 42.57 IMPERVIOUS. Res. 3.8 DU/Ac. 98 4.24 Res. 5.2 DU/Ac. 98 5.20 i Multi-family - East 98 5.9 Multi-family - West 98 4.0 98 19.34 t a Time of Concentration = See Waterworks Analysis t Total Area = 61.9 Acres Storm Data = See Waterworks Analysis P = pervious; IMP = impervious; CN = curve number E1 Hugh G. Goldsmith & Associates, Inc. SBUH HYDROGRAPH INPUT DATA SHEET Drainage Basin Developed Basin B Sub Basin No. :.:;::>;::;;::>:::::: Sf3EL:7YPt4 .ANQ USA CN ` .`: :::. ..` 14IJ :.:. A B C Pasture/Meadow 85 6.0 D Wetlands 81 0.87 PERVIOUS Weighted CN = 84.5 6.87 .17 IMIRV$QUS: Road 98 2.73 Buildings 98 0.40 IL 98 3.13 Time of Concentration = See Waterworks Analysis Total Area = 10.0 Acres Storm Data = See Waterworks Analysis P = pervious; IMP = impervious; CN = curve number E2 Hugh G. Goldsmith & Associates. Inc. File Basin Hydrograph Storage Discharge Level pool INPUT, MODIFY OR BROWSE DATA BASIN ID 100D SBUH HYDROGRAPH )ESCRIPTION 100YR/24HR CEDARWOOD DEVELOPED AREA (acres) 61 . 900 RAINFALL CHOICES ( RAIN PRECIP (in) 3 . 90 1 . TYPE. IA t,'IME INTERVAL (min) : 10 . 00 2 . TYPE I LIME OF CONC (min) : 25 . 00 3 . TYPE II RAINFALL SELECTION: 1 4 . TYPE IIA BSTRACT COEFF 0 . 20 5 . TYPE 3 13ASE FLOW (cfs) 0 . 000 6 . USER 1 IkORM DUR (hrs _ 24 . 000 7 . KC 7 DAY 8 . CUSTOM ')ERVIOUS PARCEL IMPERVIOUS PARCEL AREA: 42 . 570 acres AREA: 19 . 330 acres ICN 81 . 20 CN 98 . 00 i SUMMARY DATA IPEAK HYDROGRAPH TIME: 8 . 00 hrs ?EAK HYDROGRAPH FLOW: 26 . 8310 cfs TOTAL HYDROGRAPH VOL: 13 . 1893 ac-ft i- 1 HOME END F1 : Find F2 :New F3 : Get F4 :Tc-Calc F5 :Delete * Pgup Pgdn F6 : Compute F7 : F8 :Method F9 : Template F10 : Exit r E3 File Basin Hydrograph Storage Discharge Level pool INPUT, MODIFY OR BROWSE DATA 1 BASIN ID 10ORD SBUH HYDROGRAPH ?DESCRIPTION 100YR/24HR ROAD DITCH ONLY AREA (acres) 10 . 000 RAINFALL CHOICES IRAIN PRECIP (in) 3 . 90 1 . TYPE IA IME INTERVAL (min) : 10 . 00 2 . TYPE I IME OF CONC (min) : 41 . 52 3 . TYPE II RAINFALL SELECTION: 1 4 . TYPE IIA BSTRACT COEFF 0 . 20 5 . TYPE 3 ASE FLOW (cfs) 0 . 000 6 . USER 1 STORM DUR (hrsl 24 . 000 7 . KC 7 DAY 8 . CUSTOM PERVIOUS PARCEL IMPERVIOUS PARCEL AREA: 6 . 870 acres AREA: 3 . 130 acres CN 84 . 50 CN 98 . 00 f SUMMARY DATA IPEAK HYDROGRAPH TIME: 8 . 17 hrs EAK HYDROGRAPH FLOW: 4 . 0646 cfs .t; OTAL HYDROGRAPH VOL: 2 . 2875 ac-ft —1 HOME END Fl :Find F2 :New F3 : Get F4 : Tc-Calc F5 : Delete Pgup Pgdn F6 :Compute F7 : F8 :Method F9 :Template F10 : Exit C T �II 1 J� J t p 7 1 r-w Circular Channel Analysis & Design Solved with Manning' s Equation Open Channel - Uniform flow Worksheet Name : CEDARWOOD P . U. D. i Comment: EXISTING 18" CMP OUTFALL CAPACITY Solve For Full Flow Capacity a ...w'. Given Input Data: Diameter . . . . . . . . . . 1 . 50 ft Slope . . . . . . . . . . . . . 0 . 0069 ft/ft Manning' s n. . . . . . . 0 . 024 Discharge . . . . . . . . . 4 . 73 cfs Computed Results : Full Flow Capacity. . . . . 4 . 73 cfs Full Flow Depth. . . . . . . . 1 . 50 ft Velocity. . . . . . . . . . 2 . 67 fps Flow Area. . . . . . . . . 1 . 77 sf Critical Depth. . . . 0 . 84 ft n Critical Slope . . . . 0 . 0193 ft/ft Percent Full . . . . . . 100 . 00 96 Full Capacity. . . . . 4 . 73 cfs QMAX @. 94D . . . . . . . . 5 . 08 cfs Froude Number. . . . . FULL F TA A I t i Open Channel Flow Module, Version 3 . 41 (c) 1991 - Haestad Methods , Inc . * 37 Brookside Rd * Waterbury, Ct 06708 Circular Channel Analysis & Design Solved with Manning' s Equation Open Channel - Uniform flow Worksheet Name : CEDARWOOD P . U. D . Comment: NEW 36" CONCRETE OUTFALL CAPACITY Solve For Full Flow Capacity Given Input Data: , Diameter. . . . . . . . . . 3 . 00 ft Slope . . . . . . . . . . . . . 0 . 0030 ft/ft Manning' s n. . . . . . . 0 . 012 Discharge . . . . . . . . . 39 . 58 cfs Computed Results : Full Flow Capacity. . . . . 39 . 58 cfs Full Flow Depth. . . . . . . . 3 . 00 ft Velocity. . . . . . . . . . 5 . 60 fps Flow Area. . . . . . . . . 7 . 07 sf '. Critical Depth. . . . 2 . 05 ft Critical Slope . . . . 0 . 0046 ft/ft Percent Full . . . . . . 100 . 00 % Full Capacity. . . . . 39 . 58 cfs QMAX ®. 94D. . . . . . . . 42 . 57 cfs Froude Number. . . . . FULL F mow` t Open Channel Flow Module , Version 3 . 41 (c) 1991 Haestad Methods , Inc . * 37 Brookside Rd * Waterbury, Ct 06708 E6 H: \APPS\HYDRA\CMD\ HYDRA Version 5 . 79 TT'JGH G. GOLDSMITH & ASSOCIATES Page 1 IN : \ENGDATA\HYDRA\94057\EEBW.CMD 8 : 55 12-Sep-95 CFS CEDARWOOD * INLET TO OUTFALL Analysis of Existing Pipes ?rink Long Slope Invert San Sto Qdes Qmax GrUp GrDn SrCh/Dlt Diam Up/Dn Inf Mis Vel Cap HGLUp HGLDn Parallel d/D QRem DiffUp DiffDn Replace 1 235 0 . 0030 71 . 32 0 . 0 30 . 9 30 . 89 34 . 48 78 . 45 73 . 85 36 70 . 61 0 . 0 0 . 0 4 . 37 89 . 58 76 . 78 76 . 00 0 . 74 1 . 67 -2 . 15 - - - -- - --- --- - -- -- ------------------------------- - - -- Lateral length= 235 Upstream length= 235 •m r r, 1 a ..r t Y riGr 6 F7 -- -- __ ......*.I..—:...::,::**..:—.......:......:.,.:*...:.-:::*.....:.*.*:. ..:..-..::..*.,.:..:*:..**......::-::.:*.*.....*,..*::.. ..:I.....*..,.:..*....:..t::.:..:.-:.*.*.:...:.:'—: : : : : : : : . : : : : : :—..:...*.*:.,,.........,...***:......,.*....:,..*..'......,..: : : '' : : : : . : : : : : : : : : ' , . . . : : : ' : : : : : : : : : : : . . : : : : : : : : : - : -— : " : : : : . : . . . -:.. . : : : : : : : . . . . . . : : : : : : : : : : : : : : : : : : : . : : : : : : : : :--.:.:*..:`.:.:.:...::::.:.*...I-:.:...:....:'.....:.-*..:. : . : . . . . : ..-- ..:.*.,*......1:.i.,........*.I.....-..-..:.......*..*.....**-*..-7......,.—.. ..-...�.—..I..—...:.*.."I....:...:.:,..:*,..*:...,:.:....:..J...r.'. ..:.....:I.....:.,—.*.....:.-...****.:.....I.*.:.......::*.:.*.:*:........--.,. ..,.:.*.*....:...,..,....,,*I......:..*:...—........,:-.:*,*....:..*. :.....,,..II.**..,.......*....,,.I.....,*...--..........:.,*-*..*..—,...*.. *....::.I....:...:....,.�...**.—*......:*.:.--,........:*.*-,*::* .*I*.,.:*....—..*.....,*,.,...:-.....*,:....,....:-,,,..,....... .-.:.:.:.......*..-:,.,...,...-:: ..—*....:....�.,..*...:—I:*....,..... 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PER; EMA 1389 . . . . ., . , . . . . .80 . . . . . . . . . . . . . . :I 100 YEAR . . . . . . . . . . . . . . . . • - • : : : : : . . . . . . . 1 . . : — . . . 8 0 . . . . . . . . . _ _._.._ . . . . . . . . . . . . . . . ; " : : ; . . . . . . . . . . . . . I . . . . . . . . . . . . . : : : : : : : : : W:S•. s•77.5 : : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : ' . . . . . . . . . : : : : " . . . 5— . . . 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . `:? . 5 _ . . . . , . , . . , ,;_ . r. . . . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,,' . . . rl I1 I . . . . . . :Ca. ("all tlt�ri't:& ► 5Q . . . . . . . . . . . . . . . . , . . . . : . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . 5 E: rl:o: I z . . . , , , . . : : . : : : : . . . t . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . ,r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . :SE T-ION �� . . . . . , . . . . . . . . r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : , . , . . . 7 . . . . . EQGE W: AMER* . . . . Focr oF.wA F. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ii . . . . . . . . . . . - . . . . i . . . . . . . . : : : : : -... . . . . . . . . . . . . : : : : : . . . . . : : : : -. -. * : : . -.. . . . . . . . . . : : . . . . . . . . : : ,.*.— * . . . . . . . . . . . . . . . . . � . . . . . . . . : : : : : :: ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — , . . . . . . . . . : : . . . a . : : : : 6 5 . . . . . . . . . . . . . . . : : : . . . . . . . . . . . . . . . . . . . . . . . . : : . . - .... . o . . . . . . : . . . . . . . . . . ti . . . . . . r. . . . . . . . m . I . . . . . r*� . . . . . . . :(o . . . I . . O CA rn ; �' : : .w 't , , : : : : : (D; t. . . . . . . . . . . . .N . . . . . . . .(,. Np .N . . . . . . . .It . . . . . . I t . . . . . . . .0 . . . . . . . .CO _ IA ; .� `� m . . to u) M t+ `*' 0i . . . . . . . _ . . .p I, r. . . . . . . .p. . . . . . . . . . . . 4 . .:. .m . . . . . . . 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I- . . . . . . . r . . . . . . . . m . . . . . . . � w r- :Q' QO: . . . . . . . : :1 . ©: . . . . . . . . . . . . . . r- ti . .� -- . . . . . . . . . : : . . . : : - - * -8 Q 0, . . . . . . . . . . . . . . . . . . . : . : : : : : : : . . . : : : : : : ' : . . . . :5 DO . . . . . ;6 00. . . :7. �?0: . . . . . . . . . . . . . . . . . 2 0.0 . . . . . . . - . . . . : 0 0: . . . . . . . . . . . . .4 0 0: . . . . . . . . . . . . . . . . . . . . . . . . :o 0 0: . . . . . . o: . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : : : : : : : : : : : : . . . . . . . . . . . . . . . . . . . . . . . : : : : : : . . . . . . . . . . . . . . . . . : : : : : . . : : : : : . . : . . . . . . . . : : : : : , , - - - . . . . , . . . . . : : : : : * * . . . . : : : : , , , . . . : : : : : * * * . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . . , . . . . . . . : : : : : : : : : : : : : : : : : : . . . . . . : . . . . . . . . . . . . . . . . . . . . . . . : : , , , : . . . . . . . . . . . . . . . . : : : : : : : : : : : : : . : : : : : 85 : : : : : : : : : : ::: : : : . . . . . . . . . . . . . . . . . . . . . . . : : : : : " : : : . . : : , * . . . * . . , — : , : : : : : , : : : : : : : : : : : , , * —* : —. : : : : . . .. � . . . . . . . . . � . . . . . . . . . . . . . . : : : : : : " : . . . . . . . . . . . . . . . I �r:, r} , �: LEVLITION• - 9.0' : : : : : : . : : : . . . . . . : : : ' : : : : : 1 t� _ . . . . . . . . . . . . . . . . . . . . . . . . / -I r rrr_,, : - r �s U i . . . _ ��1 - - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •!-!.,* - _ r��A TI.n► _ TC. . . . . . . . . . . . . . . . . . . . . . . . . . . . :-"1 . . . . . . . . , . . . . . . . . . . . . ., _ _ . L L Y•�: s . . . . . - ROGIFERIF YEAR• i-��(i E' I . . . . . . . . . . . . . . .'I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i, a0(�i 5 . . . . . . . . . . . ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . . . . . PF- F'EMA;1989 . 8 0 . . . . . . . . . : , : , : : : : : : . . . . . . : . . . . . . '� . . . . . . . . . . . . . . . . . . : : . . . . . : : : . . . : . . . . . : : : : : : : : : I . . . . w . . : : : : : : : : : : : . . . . . . . . . . . . . . . . . . . . , , : : : — : . . I , , , , : : : : : . . . . . . . . . : : : : : . . . . . . . . . . . . . : " . . . . . . " ; : : : : : . . . . . . . . . . . . . : : : : : : : * , : : : : : . . : . . . . . . 5 : . — . : . . . . . . . . : : . . . . : : : : : : : . . . . . . . . . : : : : : : : : : : : : : : : : : : . : : : : . fi ; 75 . . . . . . • : : : " . : : : : * , : * . . : : . . . . . . . . . : : . . . . . . . I . . .; * * . . . : * : : . . . . . . . . . . . . . . . . . . . . . . . . ' : : : : : : . . . . II. . . . . . . . . . . : : : : : : : . . . . . . . . . . . .7 D y : : : : : : : : : • : : : - : - : : : : : . : . : : : : : : : : : : : : : : : : 7 Q : : : : : : : : . . . . . . . . : — : : : . . . . . . . . . . : : * * . . . : : : : : : : : : : : : : : : : : : : : . . . . . . . . . . . . . . . . . . . . . . . . . . . . : —... : : : : : . . : : : : : . . . . . . : : . . . . . . * : : : : : , : . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . : : : : : : : . . . . . . . . . . . . . . . . . . . . . . . . . . . : : . —* : : : : : : : : : : : : . . . : : : : .6 5 . EDGE AE ATER: . . . . EDGE OF:WA ER. . . . . . . . . . . . . . . . : : : : : : : : : : : : : : , : , : : : : : : : : . . . . . . . . . . . : : : . . . . . . . . . . . . . . . : : : : : : : : : : : j . . . . . . . . . . . . . . . - : . . . . . . . : : : : : : " , , : : . . . . . . 6 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : : : . . : : . . — : — : . : : : : : : . . . . . . . . . . : : : : " -- - - : : : : : : . . . . . . . . . . . . . . : : " : N . . . . . . . . . . . . : 'P . . . . . . . .d. . N 4' d . . .U) � . . . . . . . r` 0 p . . . . . . . .(D N d? . . . . . . . . . . . . . . . . .(G . . . . . . . .t� . . . .I� N ,� o a? o d? �' t� c.. c° : : : : : : : .R- : : 00 00 R . . . . . . ., ,m .ti : , * . . : : .f t� ti h _ : : : , 0 0. . . . . . . . . :1+ 0: . . . . . . . . . . : . : . . . . . . : : : , : . : : : : .t`�0 f- R f, 1- CO : : : : : : : : : : : : : : : : : : : : : : : . : . : . : . . . . . . . . : : : : : : : : : : : . . . : . : : . : : . . : . . . . . . . . . * . . . . . . . . . . . .4 00. . . . . . . . . . . — . Q 4: . . . . . : . ——. * , * . . . . : . . . . . . . . . . . . : : : : : —.. . . . . . . . . . . . . . . . :I+ 0: . . . . . . . . . . . . : . . .©: . . . . . 4 . ..©: . . . . . . . . . . . . , , : : : . . . : : : : : : : : : : : : : . . . . . . . . . .... . : : : : : : : : : : : : : : : : . . . . . . . . : : : : : . . : . . . . . . s . . . . . . . . . : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : . . . . . . : : : : : : : : : : : : : : : : : : : : : I : : : : : : : : : : : : : : : : : : : - : — : . . : : : : : : : . . . . : 85 : : : : : : : : . . . . . . . . . . : : : : . . . . . . . : , . . * : : ' ' : : : : : . : : . : : : : : : : : : . . . . . . . . . : . . . . . . . : . . .I. : : . . . . . . . . . . . . . . . . : : : : : : : : : —'. . . . . . . . . . : . . . . . .J: . . . . . . . . . . . ; � . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . a• . . . . FLOOD-EL ATION - T9.p . . . . . . . . . . . . . . . . . . . . . . : : . . . . . . . . . a. :, I: IL II II II I1. Ii 1. I. IIr 11 II 3. 100•YEA . . . . . . . . . . . . . . . . . . . . . � . . . . . . . . . • • PER FEM .1989 . . . . . . . . . . . . . , , _I... -� _ __ . . .� �. :. II . . . . . . ... _ --------------- _,__. . . . . . . . _ _.. _ . . . . . - . . . . M . . . . . " . . . 6( . ; . . . . . . . . i . . . . . . . . . I . . . . . . . : - . . . . . . . . . . . . . . . . . . . . . I . . . . . . . . : � . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - �� FLbOD•ELE�di►ON � 74s: . 8 Q w. —. . . . . . . : : . . . I . . . . � C�0 YE . . . . I . . . . . . . . . . . . . . . . . . . . . . . . . . . ' : : : . . . . . I . . . . . . . . . . . . . . . .� . PER FEM :1989. . . . . ' . . . . . . . . . . . � . . I . . . . . . . . . . . . . . . . * ' ' . . . . . . . . I : : . . . . . : . . . . . . . . . . . . . . . . . . . � . . . . . . . . . tp . . I : : : . . , . . . . . . 4 . . . . . . . . . : : : : : : : : . . . I : : : : : : : : : � . . . . . . : : : : : : : : : : : . . . . . . : : : : : : : : : : : . . . . : : : : . . . . : : : : . . : : : : � • . . . . . . . . . . . . . . . . . . . . . . : : : : : . . . . . I . . . . . . . . . 7i'j . I . - : : : : " : : : . . : : : : : : : : : . . . . . . . i . . . . . . . . . : : : : : : : : : 75 : : : : . : : : : : : : : : : : : . . . . . . . : : . . : : : : : " : : . . . . . . . . . . . . . . . . . . . . . . . . . . . r . . . . . . . . . . . . . . . . . . - . . . . . . �'� . . . . . . . . . . . . . . . . . . . 7 . . . . . . . ' " . . . . . it I►. . . . . . . . ; . . . . . . . . . : : . . . . . . . . . . . . . . . . . . * : : * . : : . . . . . . . - * . . �:E T:IQ fit . . : : : - : . . . . . . . . . . . �I . ; : , : , : ,. : : : : : , : : : : : . - . . . . . . . . . . . • : : : : : : . . . . . '` : : : . . . . . : . : : : : : : . . . . . . . . . . . . . . . S� �TkO. . . . . . . . . . . . . . . : : : : : : : : : . . . . . . . . . : : : : : . . . . . . 6�{ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ER. . . . . . . . . . . . . . . . . . . . . I : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : : . . : : : : : . . . 65 EDGE OF;WA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : : : . . . . . . . . . . . ' : : : : : : : : : : ' : : : : : : : : : : : : . . . . . . . . . . . — : . . . * . . . . . . . . . . . ;. : : : : : — . . . . . . . . . . . . . . . . . :to . . . . . . . . . : : : : : : ' . . . . . . . . : : . . . . . . . . :,.Lc . . . . . . ro . c° :r- N . . . . . . . .N . . . . . . . . . . . . . . . . . . . . . . . . . . . (o . . . . . . . .N . . . . . . . .0 9 0. . . :(o : : : : : : : : : : : : : : : : _: : : . . . . : . . . . . . . . . . . . . . . :I+ 0: . . . . . . :2 Q 0: . . . . . . . . `` . . . . . . . . . :0 D©: . . . . . . . . . : : : : : : - : — — . . - . . . . . . . : : : : : : . . . . . . . . . : . . . . : : : : . . . , . . : : : : : : : : . . . . . . : : . . . . . . . . - . . . . . . • . . . . . r i . . . . . . . . . . . . . . . . . . . . . . . . . . . ... • . . . . . . . . . . . . . . . . . JOB NO. 94057 HORI .: 1"-50' THE CEDARWOOD GROUP . DESCRIPTION MADE BY CHECKE REV. N0. DATE DESCRIPTION I MADE BY CHECKE SCALE: VER .: 1"=5' ' I %,. ()I..:..........-..:.........-..".............:............*............—................................0(:D..—.::. ...,....:...--....—...—:..................,........—.,:........,........... I..:.*.....—........,.......:..:...—,..:.:..:..:..:..—*::.—....*:.'.7...:.'*. I..:..*.,..:.....:..—...:.,..:...—.....—............—....,**.*...—:......,:.... L-.*':....:..-......-.....'—:,....—:.:.—.:,.—...:,.—.:.:.:.,:*.: ..:.*.: .***:.*.*::�..,*, ....—*.....—........:.*--..*I.I .*:..::**.. ,:-:...*.—:-..:.:*:....::-....'**:.....'*,*....—*:.-.*.* 1 --:.,*,: *—.....—,*..... —**.....—:'..... .:.*:.... ..:':....'....,**::...:.:. I —...:.:. .....,* —...,.:. .*:..'..:..—....—.:.... ...—.. .....: .:..... ..—.:,.....**—...:':—..:—*...,*.-.:--.—..:I.*I..:-*,.'ii1III:i'�:�I�1i,;I�.;!��;�: REV. NO. DATE , C•.--2 $ j&• !�� SHEET . , DRAWN: ON &tbog WA 2eY o �a� wAsf ,�, FLOOD PLAIN Hugh G. Goldsmith & Associates, Inc. DATE: 9/9/95 w �1%ft r �� N STUDY Z En ' eers • Surve ors • Planners APPROVED: CR 4, a ,4, Consulting g►in y XREPDWG.: ,�8c•°mt ��:.�� ' V° 1100g� LIMINARY PLAT OF CEDARW00D 1215 114th Aeenue SE Bellevue, WA 98004 VIEW: DJ °�'ai•iKoNAL 8�0 P.O. Bog 3565 TEL: 206 462-1080 > "ixEs 10/24/ 9 ia/ WHAT COUNTY WAS.HINGTON Bellevue, WA 98009 FAX: (206 462-7719 I ACAD DWG.: 94 57E02 � � EXHIBIT SECTION1 IBI I L:J 68. 0.2 // �� y, G600 . ; � ,� FAIRWAY \7 .65 / 7/� N / SECTION 11 II Xso.o \� 67. 67 a; / 71.5, 77.7 6 / \78 7 II II / •� / / x 7T. ECTION C i 78.866.7 / 50 0 50 100 7.3 7 .3 i 68. 7 4 4 5 � 78.7. 76. ' 1� "� O .2 72.6 i _ W � x 78.6 \ X�' 1 \ N [7q.000 - �� � LAKE � \ 7.5 78.1 - <�o \ NOTES: qp \\ \ \ i. DATUM: NGVD 29 \ G R 690 \\ � � x 78.6 BENCHMARK: TOP OF MONUMENT AT THE 69 I ' \ \ \ / \ X 82.2 PT OF SE 158TH STREET BETWEEN 140TH 5. t ,\ \ / 81.3 \ AVENUE SE AND SE 159TH PLACE, FROM SHEET 309-95(29) OF KING COUNTY PLANS6 \ \ PROJECT.FOR H AVENUE SE IMPROVEMENT 7 ` *6g �0 \\ \ �• \ 08 \ ELEV = 348.62 /79.4 �o 2. DATE OF FIELDWORK: JUNE 9 THROUGH 13, x \e 1995 O � 3. THE FLOODPLAIN ELEVATIONS AT EACH ` 87.4 s� Q CROSS-SECTION WERE DERIVED BY SCALE I \ \ OO 80.2\ FROM CURRENT FEMA MAPS. THEY DO NOT REPRESENT CALCULATED ELEVATIONS i I /�� \ � <�` 4. CONTOURS AND SPOT ELEVATIONS SHOWN , HERE WERE TAKEN FROM A I" - 200' SCALE ' 76.9�� �� \ o AERIAL MAP DATED 2-27-91. THEREFORE, / O \ M X 77.9Q� EVEN THOUGH THE CONTOURS CAN - �J GENERALLY BE RELIED UPON TO DEPICT THE TOPOGRAPHY IN THIS AREA, THE f ��` \\ \ ACCURACY SHOULD NOT BE EXPECT TO MEET THE NORMAL STANDARDS EXPECTED ' q�� \IN, 9.► 3 o�s \\ OF A I - 50 SCALE DRAWING. \\9 ' \ 5. IT WAS NOTED DURING THE CROSS-SECTION CTION IIEII FIELDWORK THAT SIGNIFICANT 81.2 TOPOGRAPHICAL CHANGES HAVE TAKEN x \ \\ PLACE IN THIS AREA, MOST SPECIFICALLY I \\ \ REGARDING THE NEW LOCATION OF SR-169. \ \ / THIS DRAWING DOES NOT SHOW THOSE o � _8 85.4 X 72 3 x � \ - CHANGES AS THIS WAS OUTSIDE THE ' \ \ x SCOPE OF THE FLOODPLAIN STUDY. THOSE I CHANGES DO NOT AFFECT THE ACCURACY 2.5 3 \ \ OF THE CROSS-SECTIONS SHOWN. 73.8 _ \�\ 78.2 d) ;4.6 74.0 X 77.7 74.4 *0 ' \\�\ 74.1 80.3 ' j 1 v FAIRWAY . 0 Q 81.6 X I76.9 u 82.1 i \ SECT N 'IFII i \ \ - :< 7 7.8 65.3 O /6 67.8 7 .8 �O 76.3 x / / 9 (Mqp� 72.i 2. 4.6 0,89 763� 78.9 3Q / / x 77.8 / / o I REV. NO. DATE DESCRIPTION MADE BY CHECKED REV. NO. DATE DESCRIPTION MADE BY CHECKED SCALE: I - 50' THE CEDARWOOD GROUP JOB NO. 94057 Hugh G. Goldsmith & Associates Inc. DRAWN: LDN tti o „A a g v e � C• REA 4.5 �• SWEET g � o o A � FLOOD PLAIN ,� �� �� . DATE: 19/95 ,ft�.•`S r �� •''� STUDY Consulting Engineers • Surveyors • Planners �� �- APPROVED: TMU I 1215 114th Avenue SE �a �1 o �liae Bellevue, WA 98004 XREF DWG.: 94C 57EOLXSt '�Fcrsr � e ��0, *aJrST ¢�1 PRELIMINARY, PLAT OF C E D A R W 0 0 D 2 P.O. Bog 3565 TEL: 206 462-1080 VIEW: DJ °1►'aZ iAO OZrAL Bellevue, WA 98009 FAX: (206) 462-'7719 M:\ACA .. 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