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HomeMy WebLinkAboutSWP272765 2-76 � LEVEL DRAINAGE REPORT FOR ' CONSUMER CONNECTIONS.OFFICE BUILDING , F a e - LOCATED AT WHITMAN COURT N.E., :. NEAR SUNSET BOULEVARD, RENTON.- WASHINGTON t ' OUR JOB NO. 6813 w RV 9 of SEPTEMBER 30, 1998 °s N, 23975 0 �4Ak- ' FGISTEP� � Prepared By: ExPtRES BARGHAUSEN CONSULTING ENGINEERS, INC. ' 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251 -6222 UGH A�'S mQ YII ,FZ i CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES T �EN.� REPORT City of Renton & Department of Planning/Building/Public Works ` Oje, � o� ENVIRONMENTAL REVIEW& ���'� , ,y9g DECISION ADMINISTRATIVE LAND USE ACTION 0/1 DECISION DATE. November 10, 1998 Project Name: CR Properties Office Building Applicant: CR Properties, LLC Owner. CR Properties, LLC File Number.• LUA-98-957, SA-A, ECF Project Manager- Lesley Nishihira Project Description: The applicant, CR Properties, is requesting administrative site plan approval and environmental review for the construction of a 11,424 gross square foot office building. The building is two stories in height with a footprint of 5,877 square feet. The proposed parking for the project will be on the ground floor level of the structure with office space above on the second floor. Project Location: 4319 Whitman Court NE Exist. Bldg. Area SF: N/A Proposed New Bldg. Area SF: 11,424 s.f. Site Area: 11,970 s.f. Total Building Area SF: 11,424 s.f. 'ram .— ?.�.., -•w ,-• f i NE ITTH SS V !E IOTTH ..iL tl -- --• f II �?1�14dmm©,1 , ,tps�l or•q>a I� i 01.111 CD CD C3, `� 1• .� T ...�Hs CENTRAL � HIGHHLAN PLAZA; R - e :0 QJ e — Ffpt T �6 g• .� I ... ..� .... o f m 4 m! e; 4 a a b. •U < ty. _.,• ;19 it �1 p NE IOTH ►L o Protect Location Mai) �"-- U o � aJ O vi gj U uj U ` r F U „ -f J dry-ruc-a •_"• '� ---- ----------------------------------- ----------------—- ------- - ---- a ---------- PREUMINARY LEFT SIDE ELEVATION PRELIMINARY RIGHT SIDE ELEVATION lia w,: ,�.,,e a.JJ:-a _moo_ n.{n-Rw, ---------------------- ---------•----- ------------------------------------- � N------- f,- �O PREUMINARY FRONT ELEVATION X DIX, _U m v C J U N W � o v c L O (,j c 'c U z o C � <1 u 3 d C O U o c t � F o n. Z 3 d � �. ."11 --- r Q r r i 4lll —-------------------------------------------- -------------------------------------------- PRELIMINARY LEFT SIDE ELEVATION PRELIMINARY RIGHT SIDE ELEVATION rnELMOMQMCHeaIIue �9•�'�� �w tuerwac wood au.o OONCCIIOH % % % % s*ucrn,n�u if 3 ./. /. /. aeTi� / y /. l i•.rco.s'�ii. O rn.ww-s rwrt b o sncco PRELIMINARY FRONT ELEVATION °;+. Ole,{ �� oil CITY OF RENTON PLANNING/BUILDING/PUBLIC WORKS MEMORANDUM DATE: January 11, 1999 TO: Ron Straka Dave Chistensen FROM: Clinton Morgan SUBJECT: CR Properties Office Building 4319 Whitman Court NE Please review the attached comments for any addition information require. Return the drawings and comments to me when complete. Thank You. 99cm003x cc: \\TS SERVER\SYS2\COMMON\C:\WINWORD\99CM003X.DOC CR PROPERTIES OFFICE BUILDING 4219 Whitman Court NE Development Services January 12, 1999 STORM SURFACE WATER: 1. The Storm System Development Connection Charge is $1,096.37. 2. The Storm line connection to Honey Creek drainage (existing 36-inch CMP ) must have a HPA permit from the State Fisheries, 3. Erosion and Sedimentation control plans missing. Include TESC Notes. 4. The construction plan to show the vertical profile of the sewer line in the right-of-way to facilitate a future City Storm Water Project. SEWER: 1. The Wastewater System Development Connection charge is $933.66. 2. The construction plan to show the vertical profile of the sewer line in the right-of-way to facilitate a future City Storm Water Project. 3. Rain water must be kept from entering the floor drain system to the sewer line. 99=003DS 99CM003D.DOC\ y REPORT City of Renton & Department of Planning/Building/Public Works �` �(o _ o� DECISION ENVIRONMENTAL REVIEW& `�'��, , ADMINISTRATIVE LAND USE ACTION Gib DECISION DATE: November 10, 1998 Project Name: CR Properties Office Building Applicant: CR Properties, LLC Owner. CR Properties, LLC File Number: LUA-98-157, SA-A, ECF Project Manager. Lesley Nishihira Project Description: The applicant, CR Properties, is requesting administrative site plan approval and environmental review for the construction of a 11,424 gross square foot office building. The building is two stories in height with a footprint of 5,877 square feet. The proposed parking for the project will be on the ground floor level of the structure with office space above on the second floor. Project Location: 4319 Whitman Court NE Exist. Bldg. Area SF: N/A Proposed New Bldg. Area SF: 11,424 s.f. Site Area: 11,970 s.f. Total Building Area SF: 11,424 s.f. ••- N EE I7TVA ST 107TH r' •PL --,--- S .;}ae, w �t DOD O4cCtNTRAL tp o0 G IW''.r1,Na HIGHLACN(5 PLAZA; •�,• _ A l RM•N. _ ... •� K IITH ST. ' �. ter• _ � s ' � i •IKE uIOTH PL.' t � A Project Location Map SrTERCDoc w r q � E EL I DRAINAGE REPORT i ACTIONS OFFICE BUIL ING ; LOCATED AT ' WHITMAN COURT N.E. NEAR SUNSET BOULEVARD ' RENTON, WASHINGTON OUR JOB NO. 6813 �pk-F.w RV SEPTEMBER 30, 1998 Of �o tp Z Ar 23975 �GISrEPE \ Prepared By: ExP�RES G 9q iBARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251 -6222 ' HA ' Zi CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES ratio�+�R+ ' TABLE OF CONTENTS 1.0 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 Upstream Drainage Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 On-Site Drainage Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 Downstream Drainage System Description and Problem Screening . . . . . . . . . . . . . . . . . . . ' 5.0 Resource Review . . . . . . . . . . . . . . . . . A. Basin Reconnaissance Summary Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Critical Area Drainage Area Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. Flood Plan/Flood Way FEMA Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. Other Off-Site Analysis Reports E. Sensitive Area Folios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F. SWM Divisions, Drainage Investigation, Section Problems Maps . . . . . . . . . . . . . . . . . 6.0 U.S. Department of Agricultural Soils Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ' 7.0 Wetland Inventory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8.0 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhibit A Vicinity Map Exhibit B Drainage Area Maps Exhibit C Off-Site Analysis Drainage System Table Exhibit D assessors Map Exhibit E Basin Study Exhibit F Sensitive Area Folio Exhibit G Wetland Inventory Map ' Exhibit H Drainage Complaints Exhibit I King County Soils Survey ' 6813.004[JEG/ec] 1.0 GENERAL INFORMATION The site analysis for the Level One Drainage Study was conducted on September 28, 1998. The weather was clear and sunny. The proposed project will be to construct an office building. The total site area is approximately 11,970 square feet(0.274 acres)in size. The project will be located 1 within a portion of the southwest corner of the southwest quarter of Section 3, Township 23 North, Range 5 East, Willamette Meridian, City of Renton, King County, Washington. Based on a more localized description, the project is located 180 feet south of the centerlines of the intersection of ' N.E. Sunset Boulevard (SR-900) and Whitman Court N.E. The building shall have an elevated work space consisting of one level and parking under that level at approximately street elevation. ' 1 6813.004 [JEG/ec] 2.0 UPSTREAM DRAINAGE ANALYSIS According to topography of the site, there appears to be no sheet flow drainage onto the site from the surrounding properties or the upstream area. However,the upstream areas are collected by the Honeydew Creek realignment project, which runs through the northern portion of our project. 2 6813.004 [JEG/ec] 3.0 ON-SITE DRAINAGE ANALYSIS The current condition of the site consists of approximately 0 to 1 percent slope. The site does not appear to have any drainage basins within the property. However, there are two 36-inch by 58-inch CMP pipes that run from the east property line through a 20-foot storm drainage easement recorded under the City of Renton Short Plat No. SHPL-101-89B, recorded under Recording No. 94082309006, in King County,Washington. These CMP pipes appear to be in relatively good shape. The head wall at the intake of these pipes has some spalling on the concrete, but, is in ' relatively good condition. 1 1 1 1 r 3 6813.004 [JEG/ecl 4.0 DOWNSTREAM DRAINAGE SYSTEM DESCRIPTIO N AND PROBLEM SCREENING The downstream drainage from our project begins at the project's northeast corner. It is there that all upstream and on-site drainage enters into two 58-inch by 38-inch CMP arch pipes. This pipe continues to the west for approximately 476 lineal feet and at a slope of 0.12 percent. At this point, the flows enter a second set of 58-inch by 38-inch CMP arched pipes approximately 440 feet to the west of Sunset Boulevard and Whitman Court N.E. These pipes convey the flows across Sunset Boulevard N.E. At this point, the flows enter a rip rap armored grass swale approximately 100 feet to the east of Union Avenue N.E. and Sunset Boulevard. This swale has approximately 2:1 slopes and a 10-foot bottom width. The grass inside the swale is 2 feet high and no erosion appears to be present in the swale. The outlets to the pipes have some sedimentation which is ' approximately a foot deep. The swale continues west along Sunset Boulevard N.E. to the intersection of Union Avenue, where it is then directed towards the north along the east side of Union Avenue N.E. At this time, there are two 58-inch by 36-inch CMP pipes running from east to west under Union Avenue N.E. which direct flows across Union Avenue N.E. The pipe flow outlets into a ditch ' approximately 10 feet across the bottom and 2:1 slopes. It appears this ditch is also rock lined, but, it is very hard to tell due to the amount of blackberry bushes in and around the ditch. This conveyance ditch runs into a natural drainage course along the north side of Sunset Boulevard N.E. This drainage course is located behind the Chevron station and a town home development named, "Creekside on Sunset." The conveyance channel appears to have no erosion problems, although the terrain is too steep to grant access to walk it. At this time, the requirements of a quarter-mile ' downstream has been met and appears to have no adverse affects for our project. r 4 6813.004 [JEG/ec] 5.0 RESOURCE REVIEW ' The following is a description of each of the resources reviewed in preparation of this Level I Drainage Study. ' A. Basin Reconnaissance Summary Report B. Critical Area Drainage Area Maps This site is not located within a critical drainage area. C. Flood Plain Flood Way FEMA Maps This project is not located within a flood plain, as determined by a FEMA Map. The FEMA map for this project can be found in Exhibit E of this report. D. Other Off-Site Analysis Reports No reports have been included at this time. ' E. Sensitive Area Folios Each of the sensitive area folios associated with this area was reviewed. After review, it was found that the subject property incorporated no sensitive areas. ' F. SWM Divisions, Drainage Investigation, Section Problems Maps The typical drainage compliant report that are usually described in this section in a standard King County Level I Drainage Report were unavailable due to the fact that the site is located within the City of Renton. However, we did research the downstream area of our project and ' it appears to incorporate no significant downstream drainage problems. 5 6813.004 [JEG/ecl t 1 1 6.0 U.S. DEPARTMENT OF AGRICULTURAL SOILS SURVEY The U.S. Department of Agricultural Soils Survey for King County has been incorporated in this report. It can be found in Exhibit I. 1 1 1 1 1 i 1 1 1 1 6 6813.004 [JEG/ecl ' 7.0 WETLAND INVENTORY MAPS The wetland inventory maps that were available for this area were reviewed. It was found there are no wetlands in close proximity to our project. 7 6813.004[JEG/ec] 1 8.0 CONCLUSION ' The downstream area of this project appears to have no major downstream problems. All drainage segments of our downstream appear to have adequate capacity to convey the added flows from our development. No significant erosion problems were found in the downstream area, so in 1 conclusion we feel there is no adverse impact on the downstream system if the development of our project incorporates the City of Renton standards. 1 1 1 1 1 1 i i 1 i 1 8 6813.004 [JEG/ec] � e,mmi n Vicinity Map 1 sSE I 3s AVM yI -l ld H15Yi AV 35 nr aQ JEll 5�' 5 Ar istrr O _ G Sx _ V T �dLI861��W k H10CI WN, ltA '"� er ds t f 35 AY W � O _ t I ' ' SE AV 1 dz i .pWT'1 t ND 005 l v.:: � YI rtWyUl s Ara[ AW AV ruaat x W xa� SE fi Li ZI g, 1 t.TH AY 5� r a + - 6 ."�AY 3 cv a ° t9x 3 vt E z .° r a ' w to 1. 3N�^ � H18ti nr q�•• 9' .s ;'w fUtlyyyy AY J a�}HOIJNI W 3s d a tg ,»TMa 7. `,1K #� �f•�a �: r a 3H`ld�3 �M;� � � � � � � E3F N.j, h,�;.*7r �e 9Y,,r�;' "'#•': n �tAY'�er.... e ,yam i {� KY �j{y�Gry g yam. �, v.P 'T 'r.{ gg .iT/... _�. _ 1(�If • �Al^' ,}^F?`s..l .;F�Se�i NO i �a;✓~ �'',,,,,.,' `f��._51.s!�?�+� ��t'�. .^ _ ... R1:� '�, fyy,.rjppEN`.�'� .... ' Exhibit Drainage Area Maps 1 1 946-7 9F -] 7 9.0-10 9F Il; � 6-16' cu 9 6 9j7 2� A)-2 ♦ �1( 11.` `�` ,a�. D7-2 l,;i/' 9F 20 .1� '1 j9,U_9 ♦/ �.../ �1 J H)R6Y CREEK . 1 71 87-18 37-IP 1 .. 9F7-I J .. 9 7-1 72'XI VERT 9.87 ] - �� .07 2 '9.W-116 9;-I ♦ \ F7-x ,C7_+ 9 D7-+ ? F7-II 7 - .iIN l.C7-3 - 8.17 /� ♦ ..` ../ 9,C8-16• ' Z 9.D7-1 9.E)12 �'�'. �-✓ i�i I � _ 9F) I '�.ii. .8.18- .BB-CIB, ,BB- .Ci-11 \-� 9 08-12• .D7 ,f� P�I:V Q;t 91 2 _ / B 91r8-3 t-SB'X76'CUL f ' 1. FB-+ .. � 9JB-1 �� f 9F�� 9 _f i � � 9.. ISM-] 9,CA-201 / f �, � 9IB-2 9.2 1.08-1 S 9IB-I '112 ;th14 1+r;-+ 3 14.Bx-� 1F2-P� \ IFx-1 . f� .. 1 l � ,I UA]--s D 14.1gl F3-s` .. N '3 11 _ ,. NF2-s....' 1 i ,`� � 1+l2-] N 1 th _ 6 Ivz- •. 1+.82-1 ` i �1 14 2 II.0-8 1 r• / j 1+,T2- / E6 • 10 T23N R5E W U2 UTILITIES DIVISION Renton city rota ° 4 ♦ ♦ _ 04 TECHNICAL SBRVICBS a muff lownh 0J a Lo neem 1:4900 D6 �� '� '�' 3 T23N ME W 1/2 1. .'yl 1 1 r 1 r 1 r 1 r ' Exhibit C Off-Site Analysis Drainage System Table r 1 r i r r 1 r r OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Basin: Subbasin Name: Subbasin Number: Cott S bol Drama a Cram nen bratna a Ym g i g F � lve Dtstarl fisting Potential �ervi~eYnspector P � Type;Hanle!and DesCrtpt from blems Problems Rest' oT ' isch„ r. See Map Type: sheet flow,swale, stream, Drainage basin,vegetation,cover, % 1/4 mi = Constrictions,under capacity,ponding, Tributary area,likelihood of problem, channel,pipe,pond; size, depth, type of sensitive area,volume 1,320 ft. overtopping,flooding,habitat or organism overflow pathways,potential impacts diameter, surface area destruction, scouring,bank sloughing, sedimentation,incision,other erosion 1 Site East P.L. Inlet for 2 - 58" x 36" CMP - 0 None Inflow for Honeywell Creek 2 36" x 58" CMP Pipes Under Sunset Auto Center 0.12% 0 - 476 ft. None None None 3 36" x 58" CMP Pipes Under Sunset Boulevard N.E. 476 - 568 ft. Sedimentation None None at Outlet 4 Roadside Ditch Roadside Ditch Intersects 2% 568 - 788 ft. None None Very high grass in ditch, 2:1 Union Avenue and Sunset slopes Boulevard 5 36" x 58" CMP Pipes Under Union Avenue N.E. 1% 788 - 938 ft. None None 10 ft. bottom width outlet heavily rip rapped 6 Natural Swale Natural Dense Vegetation <5% 938 - 1320 ft None None Natural drainage coarse deep ravine AF.135 1 Exhibit Assessors Map 1 LOT 4 \ 93 AO i Y _ ova / t0 LOT LOT 2 o to N y C P o f E�+ ?� 6/0) c o w �G f` i 9 ��'� Z° y a-s�� �2'� 0PP2eff� v� ,s 5 �90 �� D N ti ��P' 'k r �s /A ib ` 4, F 3 30" ` '009N7o' o h�6 IB , R� ' ; `°`' o�° wE ° N\i`l j,zo� s(0 �v 445 e�/� � / /¢ 2 `C)�j , tj`f 00 sea-4e_:�E ►' .55" o ti � \\6' b4 �/N.'b�j✓'/'3"O 1 Igo Z I 0 c �x \ h 7 2S� �kp 9 ° 'fie.+ �� S7. 7o� LOT 3 . Z 30%� S P� �� v LOT 2 N N M s e r�r see sc� uF b W ,� LOT I h V OI �0�6°r�Q�\r` t` O Z IOOPG \ S� 4NieN�VK.N v j�j I 5 r c v 9 °l 2 C2.9.o j f{s�iZ OfiS O 4j N 5511 2 jR� r REN SP 345-79 -7908179008 °I I- JA q /64.55 N Z� ` �19p0 \if 2oei VVV S6 5� �$G• 79r3o b '"f+ '�yq 674.07 3 eo,�o� ✓E: ati Q 589-39-0/E 3/4.5$ 40 Ilrze �v�y 7 so 7b �, .TM re AV z 573.�4 riiHa ca.T W o4 N � /30. 2o R= 9/9• and — h LOT 3 c,, lb L J. otA • 0 3W 19 I W ti W U t o h � � � � ITE sB9-39�ie Nlb 3/4.04- I 0 _ b h T 4 ono.zo4'� , a� j.8 4) LO o�.PG o PEiv re H e i ry O V � (� O ' rs / ia� ioo /30 3 e6- jjy-o/jr Z 34• !L O 208 �fe lv7vN o R D 2 4 0 arc o.�/9B/ _ a 3G3 I 18.53 I — �['— 3/3.S3 40 iY,�•v-ron, ��N• n-3 —Oi C iT y L/M/T S O/t0 200o N W. 10 Y 2. a . o t ' Exhibit E Bain Study 1 CITY OF RENTON , 130TH I < NE 23RD NE 23AD Revised May 16.1995 to update map format. ' Z AVENUE SF SE 101ST STREET T COURT STREET 530088 UNION 0 COURT Z NE 22ND BREMERTON NE 22ND COURT AVENUE NE m Lu z I PLACE J ,�� NE 22ND To determine if flood insurance is available,contact an insurance agent or w 1 CORPORATE LIMITS Q' PLACE callthe National Flood Insurance Program at18001638-6620. < AM ti q 4 NE 22ND STREET �C /rf111441w\ 3 BREMERTON 1 w REDMOND �c < t— COURT NE PERSON L AVENUE SE w m O 125TH Z N NE AVENUE SE m Q NE 21ST SrRFET NE 20TH < APPROXIMATE SCALE IN FEET COURT 500 0 500 K�Np REDMOND KIR CF r .AVENUE NE z NE 20TH ST m w c m SE 105TH NE 17TH I STREET PLACE VASHON z0 AVENUE NE w Z NATIONAL FLOOD INSURANCE PROGRAM NE 18TH SE 106TH STREET Z � "� ' NE 19TH STREET z Ne STREETuj ' Z OUWHIT NE 4O COURT AN / v NE 18TH RryF COURT SE 107TH qST STREET 17TH z PLACE 10 FIRM ANACORTES AVENUE ONE NE 17TH vw=i NE 17TH 1� AVENUE NE NE 16TH COUNTY STREET STREET STREET Z FLOOD INSURANCE RATE MAP NE 15TH VASHON ]C STREET NEWPORT AVENUE NE AVENUE NE KING COUNTY UNINCORPORATED AREAS KING COUNTY, 530071 WASHINGTON AND NE 15TH SUNSET NE 15TH NE 15TH PLACE STREET CITY OF RENTON INCORPORATED AREAS STREET PANEL 668 OF 1725 ISTREET w NE 14TH eO��FV (SEE MAP INDEX FOR PANELS NOT PRINTED) z 490 LU ANACCIRTES ,IREET `'� 'a PIERCE AVENUE NE i QUEEN w w PLACE NE AVENUE NE D z > CONTAINS: ° < COMMUNITY NUMBER PANEL SUFFIX ZONE X WHITMAN w ,,,COURT NE KING COUNTY. UNINCORPORATED AREAS 530071 0668 F NE 12TH STREET z RENTON.CITY OF 530088 0668 F Q ' CORPORATE LIMITS KING COUNTY UNINCORPORATED AREAS 5N071 9 10 z 0 Z z w 0 U MAP NUMBER oI 53033CO668 F } Z U Y � MAP REVISED: JOINS PANEL 0981 47030'00" MAY 16, 1995 '12009'22"AL- AL f Federal Emergency Management Agency ' Exhibit F Sensitive Area Folio 1 .• - r'�� ,�`�'�v`t :�'`'',�: � - � -_ � \veil � NO ON pp fit ilia WA �� � ` ����� � y � f f�3'`•3 %' ` � �� -.\a •• � r , r7 CIO' �s ,�*�. � � �� �� � �� �l�`►�t ,j � � tip, ji ��v ON _ y ARINl.y�"'r'�1e IAN op MWI y yApill . LIM ON Alb � 1 ° hr-v&goj ya4/� - _a•■1����\ `r" t. �t(,L_� �r>�.ti�l � a e ��r/ t{g� �',�. I y i'Ij/f/�(/'��s '�atll�e`+�� '?�►'�!+�`�"' ��;� '' � f �`y ��',; ♦`�- � e• ems'. (7A L, '��?` .- � Ira �'`�; �r� ���,'��7yj,���� ��-��+��.':.lisp \� -�.'�,e����,'��� � �1��•.,�, �`�'• �^ :fj �_ �� �'-`��r�'���..� ��I�'��s,�, [�+_ `rf`' ,a.. 1 r�'�1��/'��i.( � •,.�111��"'�","bi►'1�` ��VV 2 @. > •� "�cah1�♦' ,y �E:;�3 wa 4�.. 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T .ON �j �- f IN Ow .�M3y„. 3l�I► c'�,q J�' R� �a '``r�� '\h, � �f gya���'ti` �„�•, NO %`,W— o LN 1. �a13� �j s in E « I � ..1 \ 1• r N 1 � Fa Sig Sig U4 via sai %;;4 t6Q tZpQ mg MV.Q C;= OQQ =2 sz;;a =;Z' $Qz 0Q:3 a" Ca ma l _ A Y= - {I ' . .. .-= `l .".� 7 err 1 \\ `•�C X _, ..,, .- (,lid .il� ;r. .•:,� - 1. '. r , / \ - �'► \ .,-, ,tr id / - {u• ' { ter) �` l I ,.I ` ` , f: ) •� 1 1 yr. \� ~ \, - ( ! i `'r- '� �-4 - 1-. - _ �.•1 _ y ;.; _ \, r. „-._ I . r � i / a \ 1 v \ r ,1 - _ l_ r \ _ \ - � - y! �.`:r�� r'1 � (. � ♦- ln-.! r` _ �lo it _ - AAC Y 1 .�Jr _ - ` y _ Sri I /•,� r �j�' 1-•�� I \� . : CJ 7 v�- 9 , g/10, 1 •1'ti' u-_,x, ,. M1,,,_ _ 19,. - � :. �: • ...� 1 �.• \ 1 ^� ^s.\ t\ w,l♦ j` t '�/ t .t-'♦ - S - / Ir _ T a / 30 1 1/2 0 1 The boundaries of the sensitive areas dis- One- hundred-year floodplains extend be- Class 1 Issaquah 9 . i played of these maps are approximate. sure those shown on maps. Flood In- streams and 100 —�—- ---1 Additional sensitive areas that have not surance Rate Maps he not always show the •--•-�--�-• CIASS;�(Wit}1 581monids) been mapped may be present on a Bevel- floodplain to the headwaters of streams. zc MILE -■ opnyent proposal site. Where differences Year Floodplallls Class 2(perennial;salmonid �a 113 ry occur between what is illustrated on these maps and the site conditions, the actual pre- se use undetermined)nce or absence d the site of the sensitive — 14' area - as defined al the Sensitive Area • • • • • Class'} 10 Ordinance-is the legal control. 8 11 100-Year Floodplatrts — Unclassified - q2 - 4 - � — — yi 34b � - 29 - hth _ �1 - re 6 _ 381 - - le Ir _ isaa► "u Cn* - - 1 ,\ Deb_, � .� ',..• :.•, -..�.;•. .. -- .: _. .. -�`- l 3 -�.�'. 2 \` _� k 7b i \ -4r i t Jam` L a \ o y • , r t r - � _ T l g ;Goal Creek .� t rJ ir / i _ i V i _ 1 _ , " r �- _ b a J , .;;. s r _ - r! _ F / ::r/ i- •1 \LYE.:. - -i� - _ \ t 1' 2 r ] If 14 37 ° ` \ ��`••, l�. �-a� f j III t=`- }a' _: t z� 61 • , ' 3 r� " J' +� - 1 > J ! a i 16 4+ ' "Rhlef " i 28b 1 1/2 0 1 The boundaries of the sensitive `areas dis- Numbered wetlands •except those with an - a "a" or e Included I ed b" deli n t on r i d P on h a i a c In h these t e Y t s maps are I I I ! P approximate. King County Wetlands Inventory, The Wetlands Wetlands Issaquah 9 Additional sensitive areas that have not been mapped may it present di a Bevel- locations ie wetlands designated 'a" have _ MILE occur proposal site. Where tlion these been verified on the site by a variety of Open Water 2{r7 -- occur between what is illustrated on these sources. Wetlands designated "b"are map- 3 maps and the site conditions,the actual pre- ped in the U.S. Fish and Wildlife Service sence or absence on the site of the sensitive National Wetlands,Inventory,but their Iota- a_ Basin Boundaries 4 14 area - as defined in the Sensitive Area tions have not been field verified. _ Ordinance-is the legal control, tp There may be gaps in the numbering se- Sub basin Boundaries 8 11 quence within hin individual drainage basins. 12 ' Exhibit G Wetland Inventory Map t (Not Applicable) 1 1 1 1 1 1 i 1 i 1 1 1 i 1 1 Exhibit H Drainage Complaints 1 (Not Applicable) 1 1 1 i i 1 1 Exhibit I King County Soils Survey 1 1 (2) CN values can be area weighted when they apply I to areas of similar CN's within 20 R CN points). However, high CN areas should not be combined with low CN areas (unless the low CN areas are less than 15% of the subbasin). In this case, separate hydrographs should be generated and summed to form one hydrograph. 'eIGURE 3.S.2A HYDROLOGIC SOIL GROUP OF THE SOILS IN KING COUNTY HYDROLOGIC HYDROLOGIC SOIL GROUP GROUP* SOIL GROUP GROUP* Alderwood C A5C Orcas Peat yD Arents, Alderwood Material 0 Oridia D Arents, Everett Material B Oval[ C ' Beausite C Pilchuck C Bellingham D Puget D Briscot D Puyallup B Buckley D Ragnar B ' Coastal Beaches Variable Renton D Eadmont Silt Loam D Riverwash Variable Edgewick C Sala[ C Everett A/B `Sammamish D ' Indianola A Seattle D Kitsap C Shacar D Klaus C Si Silt C Mixed Alluvial Land Variable Snohomish D ' Nelton A Sultan C Newberg B Tukwila D Nooksack C Urban Variable Normal Sandy Loam D Woodinville D HYDROLOGIC SOIL GROUP CLASSIFICATIONS ' A. (Low runoff potential). Soils having high infiltration rates, even when thoroughly wetted, and consisting chiefly of deep,well-to-excessively drained sands or gravels. These soils have a high rate of water transmission. ' B. (Moderately low runoff potential). Soils having moderate infiltration rates when thoroughly wetted, and consisting chiefly of moderately fine to moderately coarse textures. These soils have a moderate rate of water transmission. C. (Moderately high runoff potentiaQ. Soils having slow Infiltration rates when thoroughly wetted, and consisting chiefly of soils with a layer that impedes downward movement of water, or soils with moderately fine to fine textures. These soils have a slow rate of water transmission. D. (High runoff potential). Soils having very slow infiltration rates when thoroughly wetted and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a hardpan or clay layer at or near the surface, and shallow soils over nearly Impervious material. These soils have a very slow rate of water transmission. From SCS,TR-55, Second Edition, June 19W. Exhibit A-1. Revisions made from SCS, Sol Interpretation Record, Form #5, September 1988. ' 3.5.2-2 11/92 I N 0 l- U U IN 1 I , V'V A J It I 1V V I U IN, J U h 1- i1 l L: VV P, l U' K U L: J 1 V IN Ivl /♦ IN U /1 TABLE 3.5.213 SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) ' Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1 A rainfall distribution, 24-hour storm duration. ' CURVE NUMBERS BY HYDROLOGIC SqtLGROUP LAND USE DESCRIPTION A B C ID Cultivated land(1):. winter c ition 86 91 94 98 Mountain open areas: low growing brush and grasslands 74 82 9 92 ' Meadow or pasture: 65 78 85 89 Wood or forest land: undistu ed or older second growth 42 64 76 81 Wood or forest land: young se and growth or brush 55 72 81 86 ' Orchard: with cover op 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. ' good condition: grass cover on 75% or more of the area 68 80 86 90 fair condition: grass cover on 50% to 75% of the area 77 85 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 87 89 ' Impervious surfaces, pavement, roofs, etc. 98 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100 - Single Family Residential (2) ' Dwelling Unit/Gross Acre % Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 ' 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 ' 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 ' Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and Industrial areas. ' (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9. August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. ' (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. 3.5.2-3 11/92 1