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Arr�r ::: :::: uu ::............................ . ... .. .. ::::::::::::::.::::::::::::. Ar 'ronr Rl: i;11r. _...... OUR JOB NO. 6116 OCTOBER 1997 Prepared By: I BARGHAUSEN CONSULTING ENGINEERS, INC. 1 821 5 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251 -6222 HAu��2 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES 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. FLOODPLAIN FLOOD WAY FEMA MAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. OTHER OFF-SITE ANALYSIS REPORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E. SENSITIVE AREA FOLIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F. SWM DIVISION DRAINAGE COMPLAINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 U.S. DEPARTMENT OF AGRICULTURE SOILS SURVEY . . . . . . . . . . . . . . . . . . . . . . 7.0 WETLAND INVENTORY MAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 CONCLUSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ` . . . . . . . . . . 9.0 APPENDIX APPENDIX Exhibit A Vicinity Map Exhibit B Drainage Maps Exhibit C Off-Site Analysis Drainage System Table Exhibit D Assessor's Map Exhibit E Basin Study Exhibit F Sensitive Areas Folio Exhibit G Wetland Inventory Map Exhibit H Drainage Complaints Exhibit I King County Soil Survey 6116.003 [BAH/sm] 1.0 GENERAL INFORMATION The site analysis was conducted on July 9, 1997. The weather was cloudy and rainy. The proposed project consists of two retail buildings, a QFC Market/Retail Anchor. The site's total area is approximately 8.3 acres. The project is located in a portion of the Southeast quarter of the Southwest quarter of Section 10, Township 23 North, Range 5 East, Willamette Meridian, Renton, Washington. Based on a more localized description, the property is located on the northeast corner of the intersection of Duvall Avenue N.E. and N.E. 4th Street. Currently there are portions of the site that have impervious asphalt paving. However, the majority of the site consists of second-growth trees and underbrush. The general topography of the site is sloping toward the south at approximately 0 to 5 percent. 2.0 UPSTREAM DRAINAGE ANALYSIS The project receives upstream sheetflow from the north and northeast. The approximate area of sheetflow is 8.8 acres. From the site investigation, the majority of the upstream area is second- growth timber and underbrush. It does not appear that our site receives a substantial amount of drainage from this upstream area. The majority of the upstream sheetflows into the existing wetland on the east portion of the site. 3.0 ON-SITE DRAINAGE ANALYSIS Current conditions for the project consist of sheetflow drainage that generally run from the north to the south of our project. The sheetflow is collected in a roadside ditch that runs east and west along N.E. 4th Street. The flow accumulates near the east property line and heads through an 18-inch culvert to the south. 4.0 DOWNSTREAM DRAINAGE SYSTEM DESCRIPTION AND PROBLEM SCREENING For a more detailed description of the downstream drainage system, please consult Exhibit "B," Basin Maps, and Exhibit "C," Off-Site Analysis Drainage System Table. The downstream drainage system for this project exits the site near the southeast corner. The drainage collects and heads under N.E. 4th Street through an 18-inch concrete culvert. On the south side of the street, the drainage exits into an open channel and heads toward the south. The open channel then enters into what appears to be a King County detention facility and then exits that facility to the southeast. The existing flow enters into an open channel and again heads in a southerly direction. Once the drainage reaches S.E. 132nd Street, it enters into an 18-inch tightline system that heads to the south through the residential neighborhoods. From a conversation with neighboring residents and a review of the assessor's map, it appears that King County has established drainage easements through the residential housing to convey upstream drainage to the south. From there, the drainage continues to the south until it flows into the Cedar River several thousand feet away from our site. 6116.003 [BAH/sm] Through a site investigation and conversations with the neighboring residents regarding problems in the downstream area, it appears that some flooding occurs in the area of S.E. 133rd Street during high level flows. Through a conversation with the resident, it appears through King County's site investigations that an undersized culvert was installed near the intersection of S.E. 135th Street and 142nd Avenue S.E. He also explained that King County plans to improve this culvert section in September of 1997. Other than this flooding and slight erosion in the open channels, the downstream area for this project appears to have no major capacity or erosion problems. 5.0 RESOURCE REVIEW The following is a description of each of the resources reviewed in preparation of this Level 1 Drainage Study: A. BASIN RECONNAISSANCE SUMMARY REPORT This site is included within the Cedar River Basin and the lower Cedar River Sub-basin. A Basin Reconnaissance Summary Map can be seen in Exhibit "E" along with the FEMA floodplain maps for this area. B. CRITICAL DRAINAGE AREA MAPS This site is located within the critical drainage area of the Cedar River. C. FLOODPLAIN FLOODWAY FEMA MAPS Please see Exhibit "E" for a copy of the FEMA map for this area. After review of the FEMA map, it was determined that our site is not within a floodplain. D. OTHER OFF-SITE ANALYSIS REPORTS A review of area maps, a site investigation, and basin study were reviewed for analysis and preparation for this Level 1 Drainage Study. E. SENSITIVE AREA FOLIOS Each of the sensitive area folios that was associated with this area was reviewed. After review, it was found that the subject property incorporates no sensitive areas. F. SWM DIVISION, DRAINAGE SECTION COMPLAINTS The drainage complaints for this area were reviewed that were adjacent to our downstream from our site. The list of complaints and applicable reports can be found in Exhibit "H" of this report. The underlined complaints are the ones that pertain to our project. Reports for these complaints can be obtained from King County upon request. 6116.003 [BAH/sm] 6.0 U.S. DEPARTMENT OF AGRICULTURE SOIL SURVEY The U.S. Department of Agriculture Soil Survey for King County has been incorporated in this report and can be found in Exhibit "I." 7.0 WETLAND INVENTORY MAPS Wetland inventory maps were reviewed for this project. It does not appear that the project lies within an area where any wetlands were inventoried. 8.0 CONCLUSION The downstream area for this project appears to have no major downstream-related problems. All drainage segments that incorporate the downstream area appear to have adequate capacity for existing flows. From our analysis of this project, we feel that there will be no adverse impact to the downstream system if development to the property incorporates standard City of Renton Stormwater Control Standards. 6116.003 [BAH/sm] EXHIBIT A VICINITY MAP 3S— a 35 AY HIBY~ y v „d Nth► ,► Ar xu' �i - •.+.r 3s N li �Fi --i ♦ ' + ' Ii x 35 Ara u t P xlnl 3 c"yti �6:jj iit_jnyb;� U( H Mao Y�%yI4 N wy�f'x � Crr lvii hM• 'I �� I co r► v�i 10 Woof _ MiI •) N in r-1 w _K p gSrf ;7f� i �• � AV OJNf.31 P NI� I �3 AY Nl►►t � Ay 3S AY N NLriI� N = ?' 3N , AT �ITiAM 3S AY ON I ,y aw[rt 6 f Q`vC• i Ig -r um ..�.•, _ W a, N10Y ,'% �f - .�.� �'t:. S' AV HIM (AY `� m t I a h t N xi y TnAn0) ,f ucrr I u1 x y r `4 �rr� � N r ll xut T q A'r '"'� 4 'ry H18£I °" � wlOrl t 4 Aa Nl�l Y 3LL8CI �' `�' I _•� °f i�r. la0 y x e WQW3f31 f ,. C:..-"..'• u�rl ;A�t -- `^ J r .. -vr 4 r 3A AY - -- AV • ^' A f ` f I - fy tfr/ a:3'•r 'Sc !vC°'r O �^�� le <AY A�,y� �� 3N 1J s> t '7� �'. rr. N19fi 1, AWw3 �` i t `f'i••4? I a nun "rsl�A �. `YI NYNI HM g c I A G In n y ^ ice Q , a„r . Av M 3N AYE UOINO AV ff67Y1 . . AY •,,-Np _•.r� °f44 AV +i '4x., `• A. . S I ' ArAF rp o KL6zt g ff • M MOf,T3g J.,. G•- .i.Y ,t. {I 4 y ��r \`1 f u xuc Av xlrut _'-N / t; 1 ♦ :r C S,S tAi%jir' 1AG t t a',�,`+4� Ar AT a 31 1 �D, 1 ♦ r Y "lei �► ,� T AV ^o Y FA[E S( t +1< 3M •n'•'I ° "L, ' •` a'►' ,b b G e 3 1'r W Wr 3N RIIN t _ t• " .� . d x lo rN NOSN3l.33C `\� rk a 4?� �n AroG. xraAu' „�• ~* }C` ..'r r %. x y3 N i r .1+�•3 41 /r /M 3w LIL AT n 3N.AY .. ■ r ,.t , ii r �v AY y N330LL3W ;r�' 3 ''' ti .w.... �!:• v '� 3til3.1rY Arrrr �. mn • rnan - SAW N�ijON N.t i Cr •,li ! V •N.;• S Ar �A" 1NYkJ t r� : �� CT'• WIN 1 N AY �VI oos ,rh %( e� s AY iNv4 EXHIBIT B DRAINAGE AREA MAP ..............r. . ....., j . • i NE 7th ., th.... :i s i s M , ,....... E 6th Pt NJ6-12. W ' N� tth. Ct 's ,,.;6 tl' , Z L, f ` SE 122nd St 1�16-4 .._. ....... .3i ± y.. Z 2 i i.a...:,..........,...,.:::..:...........x:.,.......... . ......:..Y. ....:......:... NE 6th Pl ,_ . fit, cli ' I .z... y. NE 6th Ct . -...� ''.. NE soh . Private Dr ............�. »�, +1 �•bthr••�t'r'" •.:NE.bth.St. i xx x SE 124th i ,.117-� ...... St I i € s .. € , z � ' ..... ....:..........: S ....... 1,.C7-1 ........ .......... ...... ...... .. ....... ....... .. Y „ ...w.......... a. , wx� i / .......�' ........ ........ .. > i i '1 14}4-3 14,38-6 j [ 14,38-7 i �0i .. ...... Z GO L �4 a c E E.......t .......... > sit c . 1_ Ise i 17,N9-S U10-.c 1188-9 tk :................................,,,•-,{�.::qt*:,.art,:..,,.:............... .:..x::..............,.,,............:x......... ................. ...: :..................::.:.:..... .:. n.....• ...n. .. .. ..a v a i1922'1 9R .✓ ... S .... ..x.,., .. ..................... ......x.,........x.,... :.........,.,..:............ ...,x.:..........,a ...,..::...........„w., 19B -7 1 f � � � G i 19.92-9 .,. 19,B2-9 'f i 1 Q i Ct.................,.... 1 5315 NW 1/4 31; g1 AREA MAP ao� 1000 i' x 0 I x ti OR IL x so? U ==J 11 0 w� TM aIr =� x» 1R I r N x � > lot T*tt o yes ii Rift M >t� " o � '�_ _ ;t its • lu W js cri S U.1 W z W I- 49 _ RENTON - 155ACLUAH ROAD " a 13 o 0Co U Cl ❑o �° ° ° 0 _ o ir ° � --- ' • 400 Ed 0 .� ❑tA \ o ° *00 p It e^15 € ell II fol tlu � ° 13 50 .2 ^ I r,-)— r..... ,I I�0- II ,. �u EXHIBIT C OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Basin: Cedar River Subbasin Name: Lower Cedar Creek Subbasin Number: ...... >StaucB ] >s ":..:lit an�i 0.iI. e tiQz3s::af.1~teld; �: . tiiil' :.::::>::>::>: t :1"vttz bcuc ::>: ::::::<<:::>::::»::: n � onet SIa .. .............................................. ............. ::::::::;....:::...................................... :.. .................................. ._..........P............... ................................b......... ..................................... ................................ .. ... ........�......._....................................................::..._......... ..........._.......... :.>;;: :; .... ' . e;. �;.a .. txe >�e Ion...:::>:::;>... �t�rn�t�� .. 1 �]E :::>::>::>. �zo�� �::.;>... :: �es� �:R�u��sr�c ar .......... ::.:::::. :: ::.. ,.:.:.::::::.::.: :.;:.;:.;:.. . :::::::::::::::::::::.:::.. lJischar ,;::::> I.estc€enf ..:;;::::....::.::.::.::.::.::... ... ........ ... ..... ......... ..... ..::.::...:..:. ..:: ...................::.... :.::...:.......:.:::::::;:::.;:::. ....:. ..::g See Map Type: sheet flow, swale, stream, Drainage basin,vegetation,cover, % Ft Constrictions,under capacity,ponding, Tributary area, likelihood of problem, channel,pipe, depth,type of sensitive area,volume overtopping,flooding,habitat or organism overflow pathways, potential impacts pond; size,diameter, surface area destruction, scouring,bank sloughing, sedimentation, incision,other erosion 1 18 Inch Concrete Culvert under N.E. 4th Street 1 0 - 80 None None None observed. 2 Open Channel Vertical ss, 10' bw, 3' deep 1 80 - 580 Slight erosion Erosion Slight erosion of bank due to earth lined high flows. 3 Open Channel 10' bw, 3:1 ss, F deep, 1 580 - 930 None None None observed. marshy area 4 18 Inch Concrete Culvert Outlet on detention pond 1 930 - 980 None None None observed. 5 Open Channel 3' bw, 2:1 ss, 2' deep, grass 1 980 - 1280 None None None observed. 6 18 Inch Tightline Tightline lined through housing 1 1280 - Flooding Flooding Neighbor reports flooding due development 2000+ to downstream undersized culvert. King County to fix in summer of 1997. 6116.004 [BAH/kn] EXHIBIT D ASSESSOR'S MAP 6oG. B3 - 60l. g4 /GS.3 12S /aS. 3 Z7S ASSESSOR'S MAP ; •3 0 m n 14 h ( �i I 3 zql VD TR.13 14 � I q.58 A� h �•S8 V I 4- .3 AG N 63 �°r` d i Ii I cod 03 4 /O/02 274 f SO So 7-74•02 324.02. . z 74 • � � 6 � \ry1i � N /62 I — i G 3.So] — I C ? N At.80 74 uj N Z ° VA O V !o Jo I 3 > I 1 F r✓BB•r/• Jar .v6e. /•o� I W 0 Itv. > 01 for Q `� \ 11 Eto 86 rX ti o�t ^ SLI L7 las. o M K J oS O o�b 0 j Io,993 44 4W Q � ��� 1 I RENT [L.4. Lc/A . "N.a7I ! m� '9 o a N n / 41 it o go + / S.L/7 380-03_-3E Zv 00� O = - r v N ? I ISO ) -/ X � Yo 0I 9� 2.Z`Sp o 7 s.� a sz, �1 s 3�Ae y� ` - so I<'ENTON ORD. JSS3 C"w) JI Cam'/ / \-3 G 1 //�C3 �/ _•- i So ice s/r 4 i 21 \./ Q E v l"o c1 o c o.j S 3 Z3? �� �E--+�—icr- 4,f'Ye e7�ei�e�-s•- -o .-.. - 4G53 Ze6-B, N .Vire..c.c./w...�c.ft/.f.... ::•I� 9 4i ,rn3/ LGS /,te• 45eo/S59 .f3 tl0/3 6/ I O 4S 79/ }sd- ,�[NTb�I o.cq. 44 70 . 4t�s/iyy a REN1aN ORv. }.�� " SE. 128TH. ST. � �,�y. . ,.. 8E. 1�8TH. r-0 s- s W. .._._�f` ,�./lps q�, p a�o�z4t466 «�J SEA 12 8 TH SST a -1 N a „°, is /es� 9 4.20 347 `F t . ��•.fltt3 sS [6 .i. / i. 4L.la k/f -fSIS/�°10 - - .y�3o s� -- � �- f3� Z L .16I Z2 �� f 4687/l27 l23.03 �o te♦ s.0 1 �,�b 5 17&.4 s �30 /.70.�Z 1! /;t/ 1 ib yaw/B7.wfP� �,• zo 1 2 / f/• t I 1 EXHIBIT E BASIN STUDY NATIONAL FLOOD INSURANCE PROGRAM NATIONAL FLOOD INSURANCE PROGRAM A A FIRM FIRM FLOOD INSURANCE RATE MAP FLOOD INSURANCE RATE MAP KING COUNTY, � WASHINGTON AND KING COUNTY, SAND INCORPORATED AREAS INCORPORATED AREAS r PANEL 981 OF 1725 (SEE MAP INDEX FOR PANELS NOT PRINTED) PANEL 982 OF 1725 (SEE MAP INDEX FOR PANELS NOT PRINTED) CONTAINS: COMMUNITY NUMBER PANEL SUFFIX CONTAINS: COMMUNITY NUMBER PANEL SUFFIX KING COUNTY, UNINCORPORATED AREAS 530071 0981 F KING COUNTY. OF WOWRENTON.CITY WOW0981 F UNINCORPORATED AREAS 530071 0982 F RENTON.CITY OF 530088 0982 F I A � MAP NUMBER F 53033CO981 F MAP NUMBER 53033CO982 F MAP REVISED: N�4�� MAY 16, 1995 BAN MAP REVISED: w MAY 16, 1995 Federal Emergency Management Agency Federal Emergency Management Agency I �/ v AwnJ JFIneA "Flw��nn n Fes.-. x O o z z 10 N W 7) CIO tL U w O �7 z Z } z uj F- Q U CITY OF RENTON 530088 SOUTHEAST 126TH STREET N Q W W N F" W 0 Z U 5 a x C) 0 v 8TH STREET 128TH w w N D w Z D W ZI Q w Q S co F co ,n r� Q w x z 00 O SOUTHEAST 12 z ZZ W �— PLACE m O tL U KING COUNTY U` 530071 } Z F- Y U w WZ Q I � SOUTHEAST PLACE 15S NORS�SS = H c" c" w F- � Q w O = CL H Ir o O � U SOUTHEAST 2ND PLACE SOUTHEAST 136TH SOUTHEAST 136TH STREET JI STREET z S��P 3 I w jQ SOU S 15 N 3�0 1 SOUTHEAST RECONNAISSANCE REPORT NO. 13 LOWER CEDAR CREEK BASIN JUNE 1937 Natural Resources and Parks Division and Surface Water Management Division King County. Washington TABLE OF CONTENTS I. SUMMARY I II. INTRODUCTION 1 III. FINDINGS IN LOWER CEDAR RIVER BASIN 2 A. Overview of Basin 2 B. Effects of Urbanization 4 C. Specific Problems 5 1. Drainage and flooding problems 5 2. Damage to property 6 3. Destruction of habitat 6 IV. RECOMMENDATIONS FOR ACTION 7 A. Reduce landslide hazards 7 B. Reduce erosion and flooding 7 C. Prevent future erosion and flooding with appropriate analysis, 8 planning, and policy development D. Stop present (and prevent future) damage to habitat 3 by addressing specific problems in stream systems V. MAP 11 APPENDICES: APPENDIX A: Estimated Costs A-1 APPENDIX B: Capital Improvement Project Ranking B-1 APPEDDIX C: Detailed Findings and Recommendations C-1 I. SUMMARY The Lower Cedar River Basin, in southwest King County, is unique in its development pat- terns and the associated environmental problems that appear throughout the basin. Except for the city of Renton and areas on the Cedar River Valley floor, most of the development in the basin has occurred on the upland plateaus. Most of this development is recent and primarily residential. In addition, the plateau is the site of numerous sand and gravel mining operations and, in the southern uplands, an abandoned coal mine. Peat is also being mined north of Otter Lake. In some areas livestock are being raised on small farms; there are no major crop-related agricultural activities in the basin. The effects of development are most apparent where storm drainage is routed over the valley walls. Impervious surfaces on the plateau have increased the rate and volume of storm runoff, resulting in substantial erosion, siltation, and flooding below. In addi- tion, erosion and siltation have damaged or destroyed habitat in many tributaries, threatening the survival of fish. Habitat and water quality throughout the basin are also threatened by the filling of wetlands and the presence of large amounts of domestic trash in some streams. The reconnaissance team noted that the Peterson Creek system has so far remained in its natural, nearly pristine condition. Maintaining this quality should be a high priority in future basin planning capital project programs. Recommendations in the Lower Cedar River Basin include 1) designing and constructing appropriately sized RID and other drainage facilities; 2) establishing stricter land use policies regarding floodplains, wetlands, and gravel mining; 3) conducting more detailed and comprehensive hydraulic/hydrologic analyses of proposed developments; and 4) preventing damage to the natural drainage system. The field team also recommends 5) restoring the habitat of several tributaries (e.g., cleaning gravels, revegetating stream banks, and diversifving streambeds for spawning and rearing) as well as 6) protecting the nearly pristine quality of Peterson Creek. IT INTRODUCTION: History and Goals of the Program In 1985 the King County Council approved funding for the Planning Division (now called the Natural Resources and Parks Division), in coordination with the Surface Water Management Division, to conduct a reconnaissance of 29 major drainage basins located in King County. The effort began with an initial investigation of three basins -- Evans, Soos, and Hylebos Creeks -- in order to determine existing and potential surface water problems and to recommend action to mitigate and prevent these problems. These initial investiga- tions used available data and new field observations to examine geology, hydrology, and habitat conditions in each basin. Findings from these three basins led the King County Council to adopt Resolution 6013 in April 1986, calling for reconnaissance to be completed on the remaining 26 basins. The Basin Reconnaissance Program, which was subsequently established, is now an important ele- ment of surface water management. The goals of the program are to provide useful data with regard to 1) critical problems needing immediate solutions, 2) basin characteristics for use in the preparation of detailed basin management plans. and 3) capital costs associated with the early resolution of drainage and problems. The reconnaissance reports are intended to provide an evaluation of present drainage con- ditions in the Countv in order to transmit information to policymakers to aid them in developing more detailed regulatory measures and specific capital improvement plans. They are not intended to ascribe in any conclusive manner the causes of drainage or erosion P:LC 1 Lower Cedar River Basin (continued) percent from the present. Most of this growth will occur in the Soos Creek Planning Area. Dominant geological and geomorphic features. The geology of the Lower Cedar River Basin is diverse. Geological formations exposed along the valley include sedimentary rocks, undifferentiated older glacial drift, extensive ground moraine deposits, recent alluvium along the Cedar River, and landslide deposits along the river and its tribu- taries. The sedimentary rocks, composed of moderately dipping sandstones, con- glomerates, mudstones, and shales, are exposed locally along the cliffs of the Cedar River Valley near the mouth of the Cedar River. In addition, the Renton formation, composed of sandstones, mudstones, and shales with periodic deposits of coal, is also exposed along the lower portion of the Lower Cedar River Valley. Undifferentiated glacial deposits found here are composed of three or more till sheets, glacio-fluvial sand and gravel, glacio-lacustrine clay, and sand, and non-glacial sand, clay and thin peat. These lie over the sedimentary rock formations and are best exposed in cross-section along the cliffs of the main valley and major tributaries. The morphology of the Lower Cedar River Basin is dominated by the valley formed by the Cedar River. Valley walls are steep cliffs formed by landslides in glacial sedi- ments. A once extensive and meandering River, which created a wide valley floor as it cut its way westward, the Cedar today is diked for most of its length through the lower valley. A narrow but extensive band of landslide deposits exists along the steep cliffs of the main river and its major tributaries. The landslide deposits consist of deformed blocks of glacial sediments and colluvium derived from slides or mass flowage, such as landslides and debris flows. Recent alluvial deposits fill the valley and major tributaries. Small, composite, alluvial debris fans exist at the mouths of the largest tributaries. Closed depressions, principally in the uplands, have lacustrine and peat deposits. The Lower Cedar River Valley has a high potential for erosion due to steep slopes and the existence of a clay laver that promotes soil failures. In addition, the confined nature of tributary channels between steep hillslopes promotes bank erosion during high flows. Numerous recent landslides are evident along cliffs of many of the steep tributaries and along the main stem of the Cedar River. These have been accelerated by the removal of vegetation and the routing of concentrated storm flows over steep slopes in areas where development has occurred. Hydrologic and hydraulic characteristics. The Cedar River Basin is composed of a complex drainage network consisting of the Cedar River and 17 tributaries. The larger tributaries begin in lakes or wetlands on the bluffs and flow through relatively flat. stable channels to the edge of the Cedar River Valley, then plunge down to the valley floor through steep, erodible ravines. Tributaries of this type such as Tributary 0304 (with headwaters at Wetland 3111) and Tributary 0328 (which begins at Lake Desire). are found on the south side of the Cedar River. Another type of tributary collects surface runoff from urbanized areas, pastureland. and wooded areas. Tributaries 0302, 0307, and 0312 are examples of this type of tributan. Thev are intermittent (depending on rainfall), shorter in length, flow through shallower channels that are steeper at the bluffs and transport more material during times of P:L.0 Lower Cedar River Basin (continued) pacted fill adjacent to new residences near collection point 5 was washed partly away during the storm, causing landsliding and gullying. Future problems will be similar to these, as commercial and residential developments increase flow rates and volumes by decreasing natural storage and infiltration. This is expected to occur if wetlands on the upper plateau are encroached upon or lost (e.g., on Trib. 0304 at RM 2.30 and on Trib. 0304A at Rm 1.60). The preservation of wetlands and streambank vegetation and the attenuation of storm flows are essential in this basin. C. Specific Problems Identified The steep valley sideslopes through which streams pass and the often dense upland development result in a number of similar problems that repeat themselves throughout the Lower Cedar River Basin. The most significant of these are outlined and discussed below. 1. Drainage and flooding problems arc often the result of several conditions: a. Undersized culverts and inadequate entrance structures. The most notable area is on Tributary 0306 at river mile .30, where a culvert here was blocked by debris carried downstream by the stream and caused erosion and flooding of Faitw�ood Golf Course. The blockage was compounded by the fact that the culvert was undersized: the problem will worsen as flows increase from upstream development. b. Serious instneam erosion and subsequent downstream sedimentation. These have been caused by three main factors: 1) runoff from residential developments on the bluffs above the valley, 2) compacted pastureland due to livestock, and 3) runoff from impervious areas originating at gravel pits. These problems will continue and worsen until mitigative measures are taken. (See Appendix C for specific examples.) c. Undersized rechannelized strearns. Tributaries on the vallev floor are too small to carry the increased flows originating in developed residential areas along the top of the bluffs. For example, Tributary 0302 at river mile .25, the channel along Maplewood Golf Course, overtops and floods during storms. d. Construction in wetland and floodplain areas, Manv of the wetlands on the south side of the Cedar River are peat bogs, and roads built through them continue to settle each year, increasing the amount of flooding on the road. For example, the road crossing with Tributary 0328B north of Lake Desire will experience more severe flooding as the road settles. C. Discharging of stormwater at the top of steep banks. At river mile 2.20 on the Cedar River, a trailer park (constructed on the edge of the cliff) discharges its drainage down the vallev wall. Increased flows erode the steep valley, depositing sediments on the valley floor. blocking channels and causing flooding. These problems will eventually stabilize, but only after a large quantity of soil has been eroded. 11:LC 5 Lower Cedar River Basin (continued) d. Wetland encroachment. Encroachment destroys habitat and eliminates natural water filtration and storage for surface runoff. Examples of this problem were observed on Tributary 0304 at river mile 2.30, Tributary 0303 at .30, and Tributary 0304A at river mile 1.30. Manv wetlands have already been completely lost through filling, for example on Tributary 0306A at river mile .55. Suspected violations were forwarded to Building and Land Development for enforcement. IV. RECOMMENDATIONS FOR ACTION The primary recommendations for action in the Lower Cedar River Basin addresses current severe problems related to erosion, habitat destruction, and flooding. Prevention of these problems will be accomplished by controlling locations and densities of new development and providing adequate R/D facilities for stormwater. A. Reduce landslide hazards by: 1. Including sensitive areas not previously mapped on the Sensitive Areas Map Folio (SAME). See Appendix C for a full listing of sensitive areas. 2 Establishing building setbacks along cliffs and native growth protection easements along steep ravines. 3. Discouraging or eliminating the routing of stormwater over cliffs, unless adequate tightline systems can be constructed to convev flows in a safe, nonerosive manner to the bottom of cliffs. 4. Decreasing peak flows by constructing larger R/D facilities to lessen the landslide and erosion occurrence along tributary slopes. B. Reduce erosion and flooding in the basin by improving surface water management: 1. Direct the Facilities Management Section of the Surface Water Management Division to evaluate existing storm-detention and conveyance facilities to deter- mine whether they are properly sized to meet current standards. Evaluation should begin with all single-orifice R/D facilities. 2 Consider areas other than wetlands as regional storm-detention facilities. Tributary 0300 at river mile .42 is the site for a proposed dam, for example. 3. Utilize existing lower quality wetlands (those rated other than #1) as regional storm-detention facilities. Wetlands 3102 and 3142 could provide more live storage, for example. 4. Review channel and culvert capacity for conveying existing and future runoff, and establish floodplain areas in regions of slight gradient for existing and future nmoff conditions. 5. Promote the infiltration of surface water through the use of retention facilities and open channels instead of pipes where the soil and slope conditions permit. Collection points 5. 6, and 12 on plateaus have such soil conditions. P:l.0 7 Lower Cedar River Basin (continued) a. On Tributary 0304: Clean streambed gravels, add habitat and bed-control weirs, and plant bank vegetation for shade. b. On Tributary 0305: Construct a new channel and move stream from road- side channel to its new location on adjacent lands. Implement a full restoration project to provide channel meanders, habitat structures, Pool/riffle enhancement, streambed gravel replacement, and revegetation. C. On Tributary 0303: Move stream from present channel to a location further north, away from the roadside. If relocation is not possible, these minimum steps should be taken: Add habitat structure to existing channel with root masses, deflectors, boulder clusters, and other features; revegetate channel banks with shrubs and small trees; enhance stream crossings with bottomless pipe arches. d. On Tributary 0328 (Peterson Creek): Add habitat structure by replacing the straight, shortened channel with a more natural, meandering one: place habitat structures (such as root masses, deflectors, cover logs, and boulder clusters) throughout the channel: and revegetate banks with shrubs common to adjacent riparian zones (salmonberry, ninebark, or dogwood, for example). 3. Protect the Peterson Creek system (Trib. 0328) in its present, near-pristine state. This will include not only the restoration outlined in section A above, but also the adoption of land use management regulations to prevent future habitat destruction: a. Protect all existing wetlands within the subcatchments of Peterson Creek. Employ wetland buffers at least 100 feet wide without exception. b. Restrict development in the critical headwater area (drainage, habitat, water quality) bounded by Lake Desire, Otter Lake, and Peterson Lake to rural densities. C. Designate and protect streamside management zones of at least 100 feet from the ordinary high-water mark (OHWM) along the main stem of the creek. Use 25 feet from the OHWM on tributaries. d. Preserve floodplains and their forests for dynamic retention of sediments and water. C. Restrict vegetation removal in streamside/wetland management zones. f. Size R/D facilities to store the 100-year storm at a two-to-five-year release rate. Use the two-cell type of pond with a forebav, a gravel filter, and a vegetated swale outflow where feasible. g. Regulate more closely all septic tank and drain-field installations, as well as maintenance schedules, particularly in the Lake Desire, Otter Lake, and Peterson Lake drainage areas. P:LC 9 \\ LOWER CEDAR RIVER BASIN Basin Boundary ubcatchment Boundary Collection Point n, Stream 0299 Tributary Number w I 03115 Proposed Project 0 1 2 Miles I July,1987 19 o 1 3105 20 ! . 3109 °w o � O `, o ° a w La3117 Lp 3121 '311$ .wow' +: +_ 03 ` \ % l o 3122 1 w 3116 . r w = a= , ,I ,• '� �7 9'9 1 - • 21 O O 3115 ' Y c N' �rtfs S i Ca9C •� O ��� n Y 311'11,0 �`" "'Al Map*van" y � , j t Y APPENDIX A ESTIMATED COSTS: PROPOSED CAPI rA1. IMPROVEMENT PRO.IECI'S LOWER CEDAR CREEK BASIN Indicates project was identified by Surface Water Management office prior to reconnaissance. NOTE: All projects are located on map included in this report. Project Collect. Estimated Costs Numbcr Point Project Description Problem Addressed and Comments 3105R 10 Enhance 2200' of Trib. 0305 from Mitigates flooding of King $115,000 Cedar River to Elliot Bridge. County park land. (NOTE: This project was proposed by Surface Water Management, is in the design phase, and will be constructed by 1939.) 3109° 10 Secure casements to wetland located Better utilizes wetland's storage $186,000 in Cascade Park and construct a berm capacity to address peak flows from at the outlet. Replace existing surrounding urban area. catch basins with control structures. Project should be justified by a hasin study. Wetland rated #2. (This wetland will require further biological evaluation before R/D design and construction.) P:LC.APA A_1 Project Collect. Estimated Costs Number Point Project Description Problem Addressed and Comments 3116 21 Raise existing road embankment Mitigatcs seasonal flooding of I_,ake $73,000 24'. Project should be indepen- Desire Dr. SE caused by road bed dently justifiable. (Refer to settling in the peat bog. Roads Division.) 3117 16 Install 1,400' of tightline, a Mitigates severe erosion, sediments $501,000 sediment trap, and 700' of channel deposited on County roads, and from Jones Rd. to Cedar River. flooding during times of high Project is independently justi- flows. fiable. 3118 10 Install 300' of 36" culvert, a new Will prevent blockage of culvert $87,000 inlet stricture, manhole, and catch and the accompanying flooding and basin. Project is independently erosion of Fairwood Golf Course and justifiable. mobile home park below. 3119 4 Construct a detention dam and Project location is ideal because $159,000 control structure in a deep it addresses flows from a large channelized section of Trib. residential area before they reach 0300. Project is independently the steep, sensitive area next to justifiable. the Cedar River. 3120 15 Construct a sedimentation pond and Mitigatcs flooding of residence and $163,000 1,000' of channel from Jones Rd. to sediment deposition on Jones Rd. Cedar River. Project is indepen- dently justifiable. P:LC.APA A-3 APPENDIX B CAPITAL IMPROVEMENT PROJECT RANKING LOWER CEDAR RIVER BASIN Prior to the Lower Cedar River Basin field reconnaissance, 12 projects had been identified and rated using the CIP selection criteria developed by the Surface Water Management (SWM) and Natural Resources and Parks Divisions. Following the reconnaissance, 13 projects remain proposed for this area. They include eight new, previously unidentified and unrated projects. These displace seven previously selected projects, which were eliminated based on the consensus of the recon- naissance team. Projects were eliminated for several reasons: two sites were annexed by the city of Renton, two projects were found to be unnecessary, two sites were categorized as #1 wetlands (and are ineligible), and one project was determined to be infeasible. The previous SWM capital improvement project list for the Lower Cedar River Basin had an esti- mated cost of $2,710,000, while the revised list increases to an estimated cost of S2,784,000. This percent increase in estimated capital costs is due to the addition of projects after the reconnaissance. The following table summarizes the scores and costs for the CIPs proposed for the Lower Cedar River Basin. These projects were rated according to previously established SWM Program Citizen Advisory Committee criteria. The projects ranked below are those for which the first rating question, ELEMENT 1: "GO/NO GO." could be answered affirmatively. Projects with scores of 100 or higher can be considered now for merging into the "live" CIP list. RANK PROJECT NO. SCORE COST 1 3122 103 $342,000 2 3118 90 87,000 3 3120 75 163,000 4 3109* 67 186,000 5 3121 65 371,000 6 3117 60 5011000 7 3115 60 361,000 8 3116 55 73,000 9 3114* 28 134,000 10 3111* 25 1751000 11 3112* 17 117,000 12 3119* 15 159.000 13 3105 12 115.000 TOTAL $2,784,000 * Projects proposed prior to the Reconnaissance Program P:LC.APB B-1 APPENDIX C DETAILED FINDINGS AND RECOMMENDATIONS LOWER CEDAR RIVER BASIN ° All items listed here are located on final display maps in the offices of Surface Water Management, Building and Land Development, and Basin Planning. Trib. & Collect. Existing Anticipated Item° River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 1 -- 5 Geology Gullying and landslides in Continued erosion. Recompact fill, revegetate, uncompacted fill in new and drain adequately. development near edge of steep hillslope. 2 -- is Geology Small landslide has formed None (natural failure). None. debris flow (11/86). Sedimentation in yard of residence. 3 0299 4 Geology Landslides in sedimentary Natural failure. None. RM 2.6 rock in cutbanks adjacent to railroad. 4 0299 16 Geology Drainage from residential Increasing erosion. Provide adequate R/D to RM 9.65 area is resulting in attenuate flows. gullying in Swale. C-1 P: LC.APC Trib. S Collect. Existing Anticipated Item River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 10 0299.1A 21 Hydrology 3116 Frequent flooding of Road located on top of peat Elevate the road 34' by RM .08 county road caused by low bog and will continue to filling on top of the road embankment. settle, aggravating flooding present road embankment. problem. Also stabilize embankment. 11 0300 4 Geology Extensive channel and Problems will continue. Provide adequate R/D in RM .00-.40 bank erosion and numerous uplands. (See Project landslides due to 3119.) development-related stormwater. 12 0300 4 Hydrology 3119 Development-related peak Increased erosion on Construct detention dam in flows have caused sig- hillslopes below. deep, channelized reach of nificant bank erosion. Trib. 0300. 13 0300 4 Hydrology 3109 Collection point 4 has Degradation of Trib. 0300 Construct berm and standard RM 1.40 been nearly completely from RM .42 downstream. This control structure at outlet urbanized. section is very steep and to Wetland 3120 in Cascade susceptible to erosion. Park. 14 0302 6 Geology Channel downcutting and Will continue at same level Control storm flows from RM .50 bank erosion. or increase. uplands. 15 0302 6 Geology Bank erosion (medium den- Increasing erosion with Provide adequate R/D in RM .80-1.00 sity) at meanders and increasing flow from devel- uplands as area develops. obstructions. opments. P: LC.APC C-3 Trib. & Collect. Existing Anticipated Item River Mile Point Category Prop. Proj. Conditions and Problems Conditions and Problems Recommendations 22 0302 6 Habitat Trash in stream (auto, Area adjacent to corridor, - Remove trash. RM 1.00 tires, appliances). will continue to collect - Distribute educational trash and debris. Further materials to streamside worsening of water quality, residents. sedimentation, erosion. - Cite violators, if problem persists. 23 0302 6 Habitat Trash in stream. Water Area adjacent to corridor, - Remove trash. RM 1.10 quality problem, will continue to collect - Distribute educational unsightly. trash and debris. Further materials to streamside worsening of water quality. residents. Cite violators, if problem persists. 24 0303 6 Geology Extensive bank erosion in None. Increase R/D volumes, slow release upper portions of tribu- rate to nonerosive levels. tary. 25 0303 6 habitat Habitat suitable for resi- Sediments will eventually - Control stormwater volumes RM .25 dent fish. Sediment accu- cover gravels. Habitat and discharge rates from mulating. will become unsuitable for developments. fish use. - Manually clean gravels when necessary. 26 0303 6 Habitat Trash and litter in Further decreases in water - Remove trash and litter. RM .35 channel affecting water quality. - Distribute educational materials quality, causing erosion. to streamside residents. - Cite violators, if problem persists. P: l.(:.APC C-5 Trib. & Collect. Existing Anticipated Item River Mile Point Catego►y Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 32 0304 7 Habitat 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 Iiabitat Debris jam may he 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 7 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 .30 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 7 Hydrology 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). P: LC.APC C-7 Trib. & Collect. Existing Anticipated Item River Mile Point Category Prop. Proj. Conditions and Problems Conditions and Problems Recommendations 43 0305 10 IIabitat Madsen Creek in ditch along Potential for fuel entry in- Acquire 30' easement away RM .20 SE Jones Rd. Heavy silt; to creek. Further decreases from roadside. Construct road runoff; water quality in water quality can be ex- new stream channel. adversely affected. pected. 44 0305 10 I lab itat Creek in ditch along south Further decreases in water Acquire 30' easement away RM .35 side of SR 169. Heavy quality can be expected. from roadside. Construct inputs of oils, anti- Potential for autos to enter new stream channel. freezes, heavy metals, channel. Lack of habitat. organic pollutants likely. Sand, silt from roadside (of SR 169) enters also. 45 0305 I2M .00- 10 hydrology 3105 Section of Trib. 0305, Flooding will continue. Construct and enhance 2200' of .40 RM .00-.40 is experiencing (See Appendix A, Project channel through undeveloped extensive flooding. 3105.) King County Park Land. 46 0305 10 Habitat Channelized along dri- Further siltation, water Acquire easement; move RM .50 veway; lacks habitat quality degradation can be creek from driveway diversity. Driveway sedi- anticipated. Lack of habitat 10-15'. Add meanders and ments enter channel, and precludes optimum salmonid habitat structures to oil. placed on driveway use. increase diversity. enters stream. 47 0305 10 IIabitat Channelized tributary Little salmonid use Add structures to increase RM .65 lacks habitat diversity, anticipated. Spawning and diversity in stream. cover for salmonids. rearing success limited Manually clean_ gravels by Gravels compacted. (unless reach is restored). churning them. P: LC.APC C-9 Trib. & Collect. Existing Anticipated Item River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 53 0306 10 Geology Channel downcutting, bank Erosion will increase. Clay Further increase in runoff RM .20 erosion and several layer in valley makes area should be attenuated; this landslides, due both from sensitive to landslides. is a sensitive channel. increased storm flows and development along edge. 54 0306 10 Geology Undersized culvert in arti- Possible fill failure: Lake Enlarge the corregated RM .30 ficial fill in golf course ponded behind culvert in metal pipe and/or threatens to build lake and in 1931 and threatened construct adequate trash possibly overtop bank. the fill. rack. Breach flood possible. 55 0306 11 Habitat Channel subject to high, Further channel damage can Increase R/D capacity, RM .25 damaging flows. Erosion be expected. Sediment decrease discharge rate. evident. transport downstream will continue. 56 0306 10 Geology Downcutting, bank erosion Will continue or increase in Attenuate storm flows. RM .30-.45 and landslides. future. 57 0306 Ilydrology 3113 Trib. 0306 connects with Problem will worsen as - Replace existing pipes RM .30 large tributary at manhole development upstream with larger diameter pipes here. Debris from 0306 continues. (if downstream analysis clogs this manhole, causing allows for increased flows). severe erosion of Fairwood - Install new inlet struc- Golf Course. tures with trash racks. 58 0306A 11 Hydrology 3122 Existing small ponds on Area upstream is developing - Acquire easements for ponds RM 1.30 0306A are overtopped and quickly, thus worsening the and additional area around ponds receive considerable silt problem. and construct detention pond. during high flows. The - Location is ideal for addressomg ponds are located on peak flows before they reach Fairwood Golf Course. the sensitive Cedar Reiver bluffs. 11: L,C.APC C-11 Trib. & Collect. Existing Anticipatcd Itcm River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 64 0309 15 Habitat Subject to heavy, rapid Erosion, deposition will - Control storm flows RM .10 flows. Channel erosion, increase. Sediments will upstream. deposition bars migration. migrate downstream, creating - Control volume and discharge a water quality problem. rates. 65 0310 15 Geology Sedimentation upstream from Continued sedimentation. - See "Hydrologic and hydraulic RM .60 culvert due to debris and characteristics" section in undersized culvert. New this report. corregated metal pipe con- tinues to pass water through. 66 0310 1.5 Geology Severe erosion below Continued erosion and - Install energy dissipator RM .05 culvert, severe sedimen- sedimentation. below corregated metal pipe. tation in residence yard. - Excavate channel through yard where original channel was located. 67 0310 15 Geology Road drainage forming gully Continued erosion. Reroute drainage. Refer problem RM 1.50 adjacent to road; road bed to Roads Maintenance. in danger. 63 0310 15 IIabitat 3120 Corregated metal pipe is Problem will continue. Reinstall corregated metal RM .25 anadromous barrier. pipe at or below bed level. P: L,C.APC C-13 Trib. & Collect. Existing Anticipated Item River Mile Point Categoiy Prop. Proj. Conditions and Problems Conditions and Problems Recommendations 74 0317 Hydrology 3111 Francis Lake is only Trib. 0317 flows through - Construct proportional RM 1.60 hydraulic control for steep area downstream of weir at outlet. Trib. 0317. lake. If area around Francis - Enhance 1,100' from Lake develops, increased Francis Lake to SE 184th St. peak flows could cause severe damage to Trib. 0317 in the steep region. 75 0320 Hydrology 3114 Existing forested wetland If surrounding area urban- Construct containment berm RM 2.40 with large amount of un- izes, this would be a good and control structure at utilized storage. Wetland site to attenuate peak outlet of wetland (if bio- currently detains flows on flows. logical analysis permits). Trib. 0320. 76 0313 19 Habitat Salmonid parr in many Decrease in water quality Establish and maintain RM .10 pools. Large pools up to with increasing develop- adequate buffers, 100' 1.75' deep. Some deposi- ment. Loss of habitat. from ordinary high-water tion in pools, behind Decrease in fish use. mark or 25' from top fo obstructions. slope break, whichever is greater. 77 03R2 19 habitat Salmonid use apparent from System is mostly in natural - Maintain adequate stream RM .35 carcasses. Sockeye, condition. As development corridor buffers. Chinook spawners. Some increases, higher flows and - Reduce discharge rates to sedimentation occurring. worse water quality can be pre-development levels. expected. Prevent clearing, grading within buffers. P: LC.APC C-15 EXHIBIT F SENSITIVE AREAS FOLIO 1b u P� I ...! 1 Mercer Slough West Lake East Sammamish s i, r * _ :-- Mercer fslafK� Coal Creek Lake Wese~S _ l YY;: Y i k� V� y,Weshington i 8 a, 28b f M �..• `• + '4 � I Ii ii h I I �t t I k ,t 'j._� ". i s A77 { ' Al or a}� *1 t I I , I - b � 20b_ IT -c I p 150 -- w,y %. J, '- _ t:117 - 4. Lower LMUDF:nivw.--- r `wit 4 - ,�. to �' 4a.� -�R y '`..�, � �\ � �L� y .Y �•. 16* ;c.`- eb Biac -R1, 17 -�I,' f ..:. rs e4•�._ rTr 2s' I n r' .. _ Y \ e+ ��r• ._" \� `�\I �t�� �. 7 2 those with an tZJl���anC S ® Wetlands nUwattl'��1 �t o• included in the �tl/�y ndn Invcnforv, The s designated 'a" have Water site by a variety of n �e5 :siynated •'bi are rnaP• t�65inBOunde(ies 9 to ►� 1 •� and Wildlife Service t'fbut their toca-etttverified. Sub-basin Boundaries ,r t in tine numbering se- - Wduai drainage basins. 1 J' i , , 'k jf t'. \ • v•,' � � �;� yam'.� \\ t r 1 :yam 1 1 1 9� . s a �G �--• t _1 \T �•• r L'T�r�;�. I. _ :y `� .. y%i - r �aS_'n � � -�7 L-1 \ .a +- 4-,� �.,r,s. Y r• �` �� s. - -- li-' / ,��s • .Sr.r• L.t W �"- .�.ice � ~_``� I �. r r R 1 y\•s arm. �� �` 1' -*' Lv ,' ;J 7 t,�_,\r ... u� , 1 �• l _ t �1� th '•+. i rT. 1 , \ 7 _ / ` j, ' ► { ii �� « ...LL\ 1 I ' ' r �� TT— i r ` T+ •-\ J r: :. + � , ,,� .•� 1 � - \t �"� i'�'`--1 i ri ,fix �St( ���■ class 1 Duwa1T)ish plains extend mays. Flood in•n. Streams and 100- - -- Class 2(with salmonids) D donot always show the he Year Flood lain headwaters streams. Class 2(perennial;salmonid use undetermined) • • • • • Class 3 +r Floodplalns Unclassified ,Z — — — . a■g +���II/��n�i� �.� ee�� N�� F.1 �� tilrllFlitt� A � I o®LA F Piiiu ew t PIN ■ �i��l it �11���� �-. .� ��' �,� � � �.. � �-{{���,���#�„� ■ "`te INK r '��r r ;MN r 1 w rt r // J •rt �. ^_., t, •n- "ti � >•;:. r 1 �.ti:.-- ,t--a'' ); r'i' _._,:��_. _ ���'�(�_'NI �•. 1 ` 1 � , . ' ---- \ 1 _ ,lam... _ _ '' ��� < , 2-2 Ir 17 • F ���jj'CC' , s 1 I— t:.� ' t � i i �t,�y .�. f ,.i•fs i l t)-. r l� R�.r'_. � s _ - �'- i -• •t r , - a•, �-: '� —. �� , i r .�: �� 'G._/ �.. � � -\• Tit' / ^ I ? t. 1. FI , (n Ir h tj r,��J ` ,.#mot �• ' �� .`ice �•'i�'� �t+ _. + 4 %4 JA I 194 i }} ail fill 10 Jill ys- 25, - I r ` Y � � y mot[ � t,�` �� J�''/i '�•'•r �'1 � ♦ ��y+,� �+ � tlf �'f. +1 a.. -.I.. r <s=7 � Y>�•. .,���f� •M� y .F� 1 ����r� `�n� ..ate �'•a` _ •.,�'..., \ r` ..I I .. i i� s..� .`�I/, i f�- �;�.�11-h• '-�� �I � '�u! 11.E -.. is had additional min- /�� Mine Hazard Duwamish ant map was filed with W I ent of Natural Re- s should that occurs Areas 2� 7�13,, :e should be preceded to confirm or deny the ditional subsurface tunnels. -i 9 Ito! 12•} ' EXHIBIT G WETLAND INVENTORY MAP EXHIBIT H DRAINAGE COMPLAINTS FROM:KING CO. DEPT.NR WLRD T0: 20G25le?92 S20G JUL 9, 1997 10:45AM P.02 TYPE OF NEW PROBLEM CONPLN TY DUMBER PE ADDRESS PROBLEM COMMENTS TH BR mzxwD=e ME= ❑oz■1 eL <zzzL2 L'azzGD=lE sz C=zzvr=n ziizPCzzzGOe zzzs cLa zzz.Ceez■it GSzzz 75-0135 C 13921 SE 136TK PL FLOG SWAMP/SE 1367H PL/HIDEWAY HTS 656J2 81-0197 C 13832 SE 131ST ST/REN T DRNG BLKED 656J2656J2 82-0341 C 14005 SE 133RD ST FLOG 656J2 82.0386 C 12808 138TH AVE SE DRNG & FLDG 656J2 8� 2.0491 C %009 SE 128TK ST FLDG MAPLEWOOD HTS 656J2 82-0525 C 16935 116TH AVE SE DVR 0 SE 132ND/144TH AVE SE 656J2 83-0353 C 13224 144TH AVE SE FLDG 656J2 Ai- C 140XX SE 132ND ST DVR FLDG 85-1 C 14100 SE 132ND ST DRNG SEE 84-1005/TO ROADS 656J2 656J2 86-01D9 C 14011 SE 132ND ST DRNG SURFACE WATER 656J2 86-01D9 C SEE YAHN STUDY DY 656J2 86-0256 F 656J2 86-0256 C 86-0256 Si COMMITTED DATEs1ST QTR 1989. 656J2 656J2 86-03A4 C 138TH AVE SE DRNG SYSTEM SILTED 656J2 86 03A4 E PROB CRTD. 656J2 86-o739 C 13323 146TH AVE SE FLDG WATER FROM SCHOOL 87.0255 C 14639 SE 132NO ST FLDG STANDING WATER & MUD 656J2 87-0328 C 13323 146TH AVE SE DRNG CO DIVERTED DRNG ONTO PROPERTY 656J2 87-0405 C 13025 138TH AVE SE FLOG SEE 87-0463 OVER STREET 656J2 87-0445 C 13837 SE 128TH ST FLDG FILLING OF LOT 656J2 87r Q445 ER 13837 SE 128TH ST FLDG SEE 86.03A4 PENTON, 87-0707 656J2 87-0463 X 13025 138TH AVE SE FLOG ON 138TH AVE SE 88^ 0280 C 14106 SE 135TH ST DRNG STRORM DRAIN FAILURE 656J2 89-0036 C 14003 SE 132ND ST DEBRIS DEBRI ON RD TO DET POND 656J2 89-0113 C 13852 SE 128TH AVE DRNG DRAINAGE OF NEIGHBORS FILL/ROAD CONST 84-0200 C 13120 138TH AVE SE SETTLING SINK HOLE IN YARD 656J265bJ2 89.0461 S2 14011 SE 132ND ST FLDG/DVR SEE-86-0256 YAHN PH I 89 0472 X 14105 SE 133RD ST INOUIRY STATUS Of STUDY(YAHN STUDY) 656J2 69-0636 % 14103 SE 132ND ST DRNG YAHN STUDY COMPLAINTS 656J2 9090-0209 C 14639 SE 132NO ST FLDG DITCH OVERFLOW/STORM EVENT 656J2 9^0-0388 C 14105 SE 133RD ST DRNG FLOODING IN NBRHD 656J2 90-0512 C 13600 138TH AVE SE DRNG CROSS PIPE ERODING RAVINE 656J2 90.0556 C 13323 146TH AVE SE DRNG DITCH ENDS/DIVERTED WATER 656J2 90-0556 ER 13323 146TH AVE SE DRNG XPIPE AND POND/DITCH ENDS 656J2 90.0804 X 14105 SE 133RD ST FLDG COMPLETION OF STUDY 656J2 1 X 14105 SE 133RD ST FLDG CAPACITY OF PLAT DRNG 656J2 91-0081 X 14105 S 133RD ST DRNG CCf#191-32/YAHN STUDY/FLOODED 656J2 - YARD 91-_0081 SR 14105 S 133RD ST DRNG PUGET COLONY HOMES 656J2 � 91-0048 X 14105 SE 133R0 ST DRNG CCFlISWM0124/DEVELOPEMENT 656J2 91-0 8 SR 14105 SE 133RD ST DRNG CCFNSWM0124 PUGET COLONY HONES 656J2 ,g-0246 C 14013 SE 133RD ST DRNG PLUGGED 656J2 21-0246 SR 14013 SE 133RD ST DRNG PLUGGED PUGET COLONY HOMES 656J2 91-0315 C 14011 SE 132ND FLDG DIVERSION/CULVERT OVERFLOW 656J2 91.0636 X 14105 SE 133RD ST FLDG CCf#491-32/PLAT DRAINAGE 6502 91-0636 NDA 14105 SE 133RD ST FLDG CCF"91-32 NOT NDA PUGET 656J2 COLONY HOMES SQL 0650 X 14105 SE 133RD ST DRNG CCF0591-2 SAME OLD PROS 656J2 91-0650 NDA 14105 SE 133RD ST DRNG CCFk591.2 NOT NDA PUGET 656J2 COLONY HOMES FROM-KING CO. DEPT.NR WLRD TO: 2062518782 S206 JUL 9+ 1997 10:46AM P.03 91-0682 CL 14105 SE 133RD ST FLDG CCF* 591=2 DUE JULY 656J2 91-0712 X 14103 SE 13ZND ST DRNG CCF# SLM 0520 MANY COMP 656J2 41 p712 NDA 14103 SE 132ND ST DRNG CCF# SVM 0520 NOT NDA PUBET 656J2 COLONY HOME 91-0715 C 14105 SE 133RD ST DRAINAGE NEIGHBORHOOD FLOODING 656J2656J2 90715 SR 14105 SE 133RD ST DRAINAGE PUGET COLONY HOMES 656J2 91_0723 X 14105 SE 133RD ST DRAINAGE CCF# 591-3T 91-0723 SR 14105 SE 133RD ST DRAINAGE CCF# 541-37 PUGET COLONY HOMES 656J2 91-0732 C 14024 SE 133RD ST DRAINAGE /LAMB (CLAIM) 91.0732 SR 14024 SE 133RD ST DRAINAGE /LAMB (CLAIM) NOT NDAP 656J2 91- 9 SR 14103 SE 132ND ST DRNG/FLO CCF* SWM-06JO NOT NDAP 656J2 fL000[NG CCF# 591-39 65612 r91_-0777 X 14103 SE 132ND ST CCF# 591-39 NOT NDA PUGET 656J2 _47-Q777 NDA 14103 SE 132ND ST FLOODING ' COLONY 91-0812 C 14639 SE 132ND ST DRAINAGE 656J2 91-0868 X 14010 SE 134TH ST DRAINAGE CCFN S1M0279/PUGET COLONY 656,12 656J2 21-OM8 SR 14010 SE 134TH ST DRAINAGE CCF# SUM0279 NOT NDAP 91-0888 X 13800 SE 128TH ST FLOODING CCF# SWM•0852WEILAND PROBLEMS 656J2 91-0888 SR 13800 SE 128TH ST FLOODING CCFNS1M•0852•ROT NDA-PUGET 656J2 COLONY HOMES 91-0 46 X 14105 SE 133RD ST DRAINAGE CCF#: 91-0822/GRANTING 656J2 EASEMENTS 91-1214 X 14105 SE 133RD DRAINAGE CCF# SA 1217/PROJECT SCHEDV�E 656,12 93-0179 C 137XX 144TH AVE SE DIVERSON POSS CLEARING VIOLATION 656J2 656H2 93-0239 X 14105 SE 133RD ST INQUIRY INFO ONLY 93.1064 C 14400 SE 136TH ST FLDG GRND VACATION ORAINAGEATER IMPACTDER fROMOADWAY VACATION 656H2 9� 5-0763 C 14010 SE 134TH ST REQUEST 2 u 3 C 140TH SE 132NO -135TH SE CIP REQUEST TO DO ASSESSMENT OF 656H2 CONVEYANCE 97- 656J2 5 C 14105 SE 133R0 ST FLDG PUGET COLONY HOMES 656J2 ,Q7-0055 R 14105 SE 133RD ST FLDG PUGET COLONY HOMES 656J2 97-OD55 NDA 14105 BE 133RD ST FLDG PUGET COLONY HOMES EXHIBIT I KING COUNTY SOIL SURVEY SOIL SURVEY CountyKing Washington UNITED STATES DEPARTMENT OF AGRICULTURE Soil Conservation Service in cooperation with WASHINGTON AGRICULTURAL EXPERIMENT STATION Issued November 1973 +x U •� .�.. r, � '* Y•::�.�+�' _� = r$ �'a's� ..I•� �: �:•_*Q LO t'. � 1 ..:�\�. iCDia I N fG '��••`•t, rt` ) 'y'r1 .11 If-: ,v . . t1y, j ' - r �,�'.y"51��• a '� ' s:I r'I+ � it 'r �, off-.. I � ���y�,' '•) r + � I�:..f or ° i`."r �.�•�. �.�,� �y S R• r ,:SIT-' 1� 1 r r ,�0� Ah tiy+ .?+} r...2" .tom•• ,• .ir i •.i s .� .Y w11:. y,, r. �1 1 j/' Q � �O ,�,'.H. �y�r"'k /�s r,�,.. C�� •1pr�� �d�`,� { �t, Ir.�.�•y,7 ;. < (��'// �r•r# "M ' , ye'Y, ii i '+fir'.•3• f.. +' // ?w '.�' B" l // tom. r.7... ` f.{ :•w. • � � �i � }1s 'a� � fir• - �;t� Y1. � � -_-_ __ -_- _ S 04 •�i 11 �. 7 ��• e � �.. :?sd { s•r1 f r.l F 4 1 1 1 .�.^a)-� � / 1 � • •� •�' 't ., ` ��� �, ,�� , . '� �� ,is ;; / 1 � � "rCtc. ., .a '•• "•1 ... ...• nXEc.. s�• t.,. N ' 2 v "'f� �� � •, �.. .y `�`4 �. �Id' •�'/f + .}t Q ti li �I / ,\t' m ' r• II��`+ � _ .� J". t \ 1 '` r!•-i `k :. 4 ' ,� r l^ � - I� rq ; .� Y a ''": .. . .• �=n• tD '�i ��' 1 � .r'1i ':i_k��A+' j "° N � ^�+ x I i 'r j ^ N � U . i• x r r f 1; a s ti rN . ` Ir ii N tio `f,.'1.Y r4: � �..,. - ' t t� •• , l „ • *� \�4. �i ,�; e'agt�' Fh• .'li I � IIt .°.. �,• ty y - 1•�i(pJ�/I Yr r �,. 6 t a yy !. �:`++G, w _.. q 00. �,.1..,� �•,{, O � R,( � •�� :sss t •:i �.•: J�.S Y L •`'" �'° �` k r i rY�` � �}`t.• au� ia, i t � � • i .''/'••. � • �+ • t\ � � r � 1 (.9��•a !• •�•., •P it � �,V� �+ * < 11 �y��. i��". •; yP'. R•.L� �� ?+;+h't rf., V.� b t � / _ � .,:,� C.°. 'eG Y ,..J. �" f ••1A}i�S�tir-'riyo i '.': o'i f � • • L _{- / I Jr >N4 t �1.�r{!�� TT •, s J^• •• ;r I gr it I '•+ E �• Al ' C1i+' N , r .�:ti7 " +7t .1 ! • ••• /4 .r,- 1 c,�i-. t �� _ ... ` ". W• ,a' a 00 rV :fir•': _� ; Q }+♦« I�ti j' •�• �.• �'' ° �� I IP LL 1• �' yr` \ U 'X M i IE I�w• ,..-�,•4 t.• •�;'•aa:" �Y c ••_ �1 �/ �iI ��, r4 M�:-. �•;J � ! � �; f$s s q �tir•1 1;t�.._ J.L; !.— �r. ` L ' T If "?; \;i !•r -./�••'�„I''��. G-. �=1,Q I r.. .1� '•.r. j d •..r 1��.rr' i 1. b, ~(;. '.WCO 'V mT�_:` ♦ + 'a.•. !1' ♦ S r�•• "r.. •�j ` F' � � ,r: f °�• `: ' 4n 1- �*.;„ C!1 In U ti. y i; j`: •I :�+ •� j} •_�i•.f.� •r•f �p �v� �, Via. �r��� ,� i fir•�!'�� z �;d� �t.d•'' y�t`. •'I^' y ;... Q a .Jjii •i t •t 5.• t rr ti_y�l,,+� \ I x X: �E�: °A.. �'� it•� f R "��•' ��'.�; X4.00. ��: •tit E °--�^., ±� � Cl :;;;. co r tied .• ♦ °� •, � .ii. � < i ,; � 1 A� •`.0 FE: (p ......» ��m dtrr ���yR = 4i` `CV� .`• `� "' ;r.�' �� i' �• t ... .. .. �r.N •�. GUIDE TO MAPPING UNITS For a full description of a mapping unit, read both the description of the mapping unit and that of the soil series to which the mapping unit belongs. See table 6, page 70, for descriptions of woodland groups. Other information is given in tables as follows: Acreage and extent, table 1, page 9. Town and country planning, table 4, page 57. Engineering uses of the soils, tables 2 and 3, Recreational uses, table 5, page 64. pages 36 through SS. Estimated yields, table 7, page 79. Woodland Described Capability unit group Map on symbol Mapping unit page Symbol Page Symbol AgB Alderwood gravelly sandy loam, 0 to 6 percent slopes---------- 10 IVe-2 76 3d2 AgC Alderwood gravelly sandy loam, 6 to 15 percent slopes--------- 8 IVe-2 76 3dl AgD Alderwood gravelly sandy loam, 15 to 30 percent slopes-------- 10 VIe-2 78 3dl AkF Alderwood and Kitsap soils, very steep------------------------ 10 VIIe-1 78 2dl AmB Arents, Alderwood material, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2 AmC Arents, Alderwood material, 6 to 15 percent slopes 1/--------- 10 IVe-2 76 3d2 An Arents, Everett material 1/----------------------------------- 11 IVs-1 77 3f3 BeC Beausite gravelly sandy loam, 6 to 15 percent slopes---------- 11 IVe-2 76 3d2 BeD Beausite gravelly sandy loam, 15 to 30 percent slopes--------- 12 VIe-2 78 3dl BeF Beausite gravelly sandy loam, 40 to 7S percent slopes--------- 12 VIIe-1 78 3d1 Bh Bellingham silt loam------------------------------------------ 12 IIIw-2 76 3w2 Br Briscot silt loam--------------------------------------------- 13 IIw-2 75 awl Bu Buckley silt loam--------------------------------------------- 13 IIIw-2 76 4wl Cb Coastal beaches----------------------------------------------- 14 VIIIw-1 78 --- Ea Earlmont silt loam-------------------------------------------- 14 IIw-2 75 3w2 Ed Edgewick fine sandy loam-------------------------------------- 15 IIIw-1 75 2ol EvB Everett gravelly sandy loam, 0 to 5 percent slopes------------ 15 IVs-1 77 3f3 EvC Everett gravelly sandy loam, 5 to 15 percent slopes----------- 16 VIs-1 78 3f3 EvD Everett gravelly sandy loam, 15 to 30 percent slopes---------- 16 VIe-1 77 3f2 EwC 'Everett-Alderwood gravelly sandy loams, 6 to 15 percent slopes------------------------------------------------------ 16 VIs-1 78 3f3 InA Indianola loamy fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3 InC Indianola loamy fine sand, 4 to 15 percent slopes---- ------ 16 IVs-2 77 4s3 Indianola loamy fine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2 3 Kitsap silt loam, 2 to 8 percent slopes----------------------- 17 IIIe-1 75 2d2 „pC Kitsap silt loam, 8 to 15 percent slopes---------------------- 18 IVe-1 76 7d2 KpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2dl KsC Klaus gravelly loamy sand, 6 to 1S percent slopes------------- 18 VIs-1 78 3fl Ma Mixed alluvial land------------------------------------------- 18 VIw-2 78 2o1 NeC Neilton very gravelly loamy sand, 2 to 15 percent slopes------ 19 VIs-1 78 3f3 Ng Newberg silt loam--------------------------------------------- 19 IIw-1 74 2ol W Nooksack silt loam-------------------------------------------- 20 IIw-1 74 2ol No Norma sandy loam---------------------------------------------- 20 IIIw-3 76 3w2 Or Orcas peat---------------------------------------------------- 21 VIIIw-1 78 --- Os Oridia silt loam---------------------------------------------- 21 IIw-2 7S awl OvC Ovall gravelly loam, 0 to 15 percent slopes------------------- 22 IVe-2 76 3dl OvD Ovall gravelly loam, 15 to 25 percent slopes------------------ 23 VIe-2 78 3d1 OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-1 78 3d1 Pc Pilchuck loamy fine sand-------------------------------------- 23 VIw-1 78 2sl Pk Pilchuck fine sandy loam-------------------------------------- 23 IVw-1 76 2sl Flu Puget silty clay l0am----------------------------------------- 24 IIIw-2 76 3w2 Py Puyallup fine sandy loam-------------------------------------- 24 IIw-1 74 2ol RaC Ragnar fine sandy loam, 6 to 15 percent slopes---------------- 25 IVe-3 77 4sl RaD Ragnar fine sandy loam, 15 to 25 percent slopes--------------- 26 VIe-2 78 4sl RdC Ragnar-Indianola association, sloping: I/---------------------- Ragnar soil---------------------------------------------- -- IVe-3 77 4sl Indianola soil------------------------------------------- -- IVs-2 77 4s3 RdE Ragnar-Indianola association, moderately steep: 1/------------ 26 -------- -- Ragnar soil--------------------------------------------- -- VIe-2 78 4sl Indianola soil------------------------------------------- -- VIe-1 77 4s2 U. S. GOVERNMENT PRINTING OFFICE:1973 0-468-266 GUIDE TO MAPPING UNITS--Continued Woodland Described Capability unit group Map on ymbol Mapping unit page Symbol Page Symbol Re Renton silt loam-------------------------------------------- 26 IIIw-1 75 awl Rh Rivezwash--------------------------------------------------- 27 VIIIw-1 78 --- Sa Salal silt loam--------------------------------------------- 27 'IIw-1 74 2ol Sh Sammamish silt loam----------------------------------------- 27 IIw-2 75 awl Sk Seattle muck------------------------------------------------ 28 IIw-3 75 --- Sm Shalcar muck------------------------------------------------ 29 IIw-3 75 --- Sn Si silt loam------------------------------------------------ 29 IIw-1 74 2o1 So Snohomish silt loam------------------------------ ------ 30 IIw-2 .75 3w2 Sr Snohomish silt loam, thick surface variant------------------ 31 IIw-2 75 3w2 Su Sultan silt loam-------------------------------------------- 31 IIw-1 74 awl Tu Tukwila muck--------------------------------------- ------------------------------------------------ 32 IIw-3 75 --- UrUrban land-------------------------------------------------- 33 -------- -- --- Wo Woodinville silt loam--------------------------------------- 33 IIw-2 75 3w2 1/ The composition of these units is more variable than that of the others in the Area, but it has been controlled well enough to interpret for the expected use of the soils. IV. RETENTION/DETENTION ANALYSIS AND DESIGN 4.0 RETENTION/DETENTION ANALYSIS AND DESIGN A. EXISTING SITE HYDROLOGY The 8.4-acre site consists primarily of brush and tree cover, with the exception of a paved area fronting N.E. 4th Street. This paved area consists of 0.57 acre and contains no significant drainage features. A small portion of the eastern half of the site sheetflows to existing wetlands. The majority of the site is very flat and flows from northeast to southwest toward the intersection of Duvall Avenue N.E. and N.E. 4th Street. Times of concentrations were calculated based on the sheetflow and shallow flow tendencies of the existing site. Curve numbers used in the calculations are determined based on the King County Soil Survey maps showing the on-site soil to be Everett gravelly, sandy loam, a Group "B" soil with a curve number of 72. This is based on a young second-growth wood and forest condition. Please refer to the existing conditions exhibit later in this section of the report for further information concerning existing conditions of the site. B. DEVELOPED SITE HYDROLOGY Storm drainage runoff from all paved areas and building areas of the site will be collected in a tightline conveyance system located beneath the parking lot which conveys all the storm drainage to a detention pond located in the northeast corner of the site. Times of concentration were calculated based on sheetflow across landscaped areas and paved areas and conduit flow in the tightline conveyance system. The total developed area of the site is 7.4 acres, including the detention pond. The existing wetland in the southeast corner of the site will be enlarged and enhanced to compensate for the filling of the smaller wetland located in the center of the east section of the site. Curve numbers are again based on the soil conditions; a curve number of 80 for the proposed landscaped areas and 98 for impervious areas. C. HYDROLOGIC ANALYSIS The storm drainage conveyance system for the project is designed based on a hydrograph method using the 25-year/24-hour design storm. The proposed conveyance system is designed to work as a gravity system requiring no additional head to convey the design flows. The proposed detention pond is a 3-cell pond located in the northeast corner of the site which will limit outflows of the 2-year, 5-year, 10-year, and 100-year/24-hour storms to one-half the 2-year, 5-year, 10-year, and 100-year existing condition peak flows. A minimum 10 percent volume increase for the 2-year design storm and 30 percent volume increase for the 100-year design storm have been included in the detention pond. The pond is designed using the Santa Barbara Urban Hydrograph method for calculating peak flows and volumes. Hydrographs were computer-generated using Waterworks software. The computer output is contained in this section of the report. 6116.011 [KL/sm] D. RETENTION/DETENTION SYSTEM The wet/detention pond located in the northeast corner of the site will act dually as a water quality and detention system. A 3-cell wet pond will provide the necessary water quality treatment required for this project. The volume of the wet pond required has been doubled to eliminate the need of a biofiltration swale preceding the pond. The wet pond portion of the detention pond will be 4 feet deep, with the lowest foot provided for sediment storage. Detention will be provided in the 3 feet above the wet pond surface. Retaining walls extend from the wet pond surface elevation to the top of the pond. The control structure for the detention pond will be contained in a Type 2 catch basin located off the southwest corner of the pond. This catch basin will contain a riser with an orifice and weirs to limit post-developed flows to pre-developed conditions as described in part "C" above. The controlled flows exiting this structure will flow south and be discharged into the existing conveyance system in N.E. 4th Street. 6116.011 [KL/sm] �TdQr' 1�q-t�Vi4�5 C1P�Gya�4-�'7d�1 7DV L 9. 3 4 ivr�O�l2 v iov s 26.5; 000 -N N a aa_a N M N N N N t=xA=-r si 7-gr x 8 34 ?4 C. //rIPC2V/Gt� , lL�f� �t/NG �4ANlstfD ' ' (0. )0 19L GN PL�avie _32 A4- LN 8a 8� Lfz SdRA4,�(�w ✓4c Z P&PD vt0us C i m -i- /1tOURYiov-S !o D t f sao. CO4-v6;» ) o'l S S(m Z-F Gone v t i �J�ao rtm ) o• 2Z I lE-,q /zc?2Qvt26�-4e'v,3 Po s r Pe-V Perk. f2-�-c..oL.,j P29- 9&-V 0%4K FFto t-J 2 Yk JZ 4 tf-2 %Z 2.yR /Z4 pt& -6.-Y2 �-Z 4 lf4- 5-ya 124 tf/Z iv Y2 1�4 100- /OY2 fz¢ 1/a M �,t 4 4" y, 100 Y2 17-4 PIA �-30 OFS IdiV �oN� 1749) eL 34) q�,Z-- erL 34 V _ .S2,4 4-Z W F H W W W W W W xxx kn�n CA 000 Na aav �-7 �7 i N C4N L l l s v L o L' L- 39(o V z 22,'72b� 6-L 397 V = 4S;4s—o 3qg Y - 9a, Boa i i i I�Z Z'�21z q �2 +. �r' gtsSF FL z 3 97.09 vo t 3G,.5-78,Za ea- (nrysr Aw-0 ) PoNb vo L em mac,z c.F 47,4ell c,F/36,s7$ �� 3 0•/ ��,o •� , o K) ; f 1/14/98 9 : 40 : 17 am Barghausen Engineers page 1 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: Dev02 NAME: 2YR/24HR POSTDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 1. 32 Acres 6. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . . 23 . 82 min 8 .96 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 100. 00 ns: 0. 2400 p2yr: 2 . 00 s: 0. 0100 impTcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0150 impTcReach - Channel L: 856. 00 kc:42 . 00 s: 0. 0022 PEAK RATE: 2 . 48 cfs VOL: 0. 96 Ac-ft TIME: 480 min BASIN ID: Dev05 NAME: 5YR/24HR POSTDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 40 inches AREA. . : 1. 32 Acres 6. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 23 . 82 min 8 . 96 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 100. 00 ns: 0. 2400 p2yr: 2 . 00 s: 0 . 0100 impTcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0 . 0150 impTcReach - Channel L: 856. 00 kc: 42 . 00 s: 0. 0022 PEAK RATE: 3 . 06 cfs VOL: 1. 19 Ac-ft TIME: 480 min BASIN ID: Dev10 NAME: 10YR/24HR POSTDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 1. 32 Acres 6. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . . 23 . 82 min 8 .96 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 100. 00 ns: 0. 2400 p2yr: 2 . 00 s: 0 . 0100 impTcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0150 impTcReach - Channel L: 856. 00 kc: 42 . 00 s: 0. 0022 PEAK RATE: 3 . 79 cfs VOL: 1. 49 Ac-ft TIME: 480 min 1/14/98 9 : 40: 17 am Barghausen Engineers page 2 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: Dev100 NAME: 100YR/24HR POSTDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7.42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 1. 32 Acres 6. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . . 23 . 82 min 8 .96 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 100. 00 ns: 0. 2400 p2yr: 2 . 00 s: 0. 0100 impTcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0150 impTcReach - Channel L: 856. 00 kc:42 . 00 s: 0. 0022 PEAK RATE: 5. 27 cfs VOL: 2 . 08 Ac-ft TIME: 480 min BASIN ID: EX02 NAME: 02YR/24HR PREDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 6. 85 Acres 0. 57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 98 . 00 TC. . . . : 109 . 32 min 109 . 32 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 300. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0060 TcReach - Shallow L: 80. 00 ks: 5. 00 s: 0. 0060 PEAK RATE: 0. 18 cfs VOL: 0. 25 Ac-ft TIME: 960 min BASIN ID: EX05 NAME: 5YR/24HR PREDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7.42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 .40 inches AREA. . : 6.85 Acres 0. 57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 98 . 00 TC. . . . : 109. 32 min 109. 32 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 300. 00 ns: 0.4000 p2yr: 2 . 00 s: 0. 0060 TcReach - Shallow L: 80. 00 ks: 5. 00 s: 0. 0060 PEAK RATE: 0.28 cfs VOL: 0. 38 Ac-ft TIME: 660 min 1/14/98 9 : 40 : 17 am Barghausen Engineers page 3 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: EX10 NAME: 10YR/24HR PREDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 6 . 85 Acres 0. 57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 98 . 00 TC. . . . : 109 . 32 min 109. 32 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 300. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0060 TcReach - Shallow L: 80. 00 ks: 5. 00 s: 0. 0060 PEAK RATE: 0. 44 cfs VOL: 0. 55 Ac-ft TIME: 660 min BASIN ID: EX100 NAME: 100YR/24HR PREDEVELOPED SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 6 . 85 Acres 0. 57 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 98. 00 TC. . . . : 109 . 32 min 109 . 32 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 300. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0060 TcReach - Shallow L: 80. 00 ks: 5. 00 s: 0. 0060 PEAK RATE: 0. 89 cfs VOL: 0. 97 Ac-ft TIME: 550 min BASIN ID: wet02 NAME: 1/3 2YR/24HR POSTDEV-wetpond SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 0. 67 inches AREA. . : 1. 32 Acres 6. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . . 23 . 82 min 8 . 96 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 100. 00 ns: 0. 2400 p2yr: 2 . 00 s: 0 . 0100 impTcReach - Sheet L: 100. 00 ns: 0. 0110 p2yr: 2 . 00 s: 0. 0150 impTcReach - Channel L: 856. 00 kc: 42 . 00 s: 0. 0022 PEAK RATE: 0. 65 cfs VOL: 0. 24 Ac-ft TIME: 480 min 1/14/98 9 :40: 17 am Barghausen Engineers page 4 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres 1 0. 090 960 5469 cf 7 .42 2 0. 091 1470 13189 cf 7 .42 3 0.281 1450 20014 cf 7.42 4 0.439 1350 31725 cf 7.42 5 0.895 980 57061 cf 7.42 6 0. 080 1470 11771 cf 7.42 7 0. 089 1470 13173 cf 7.42 8 0. 287 1460 20694 cf 7 . 42 9 0. 658 1340 44654 cf 7 . 42 1/14/98 9:40: 24 am Barghausen Engineers page 5 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 STORAGE STRUCTURE LIST STORAGE LIST ID No. DESIGN Description: DESIGN DETENTION POND STORAGE LIST ID No. FINAL Description: DESIGN DETENTION POND 1/14/98 9 : 40 : 24 am Barghausen Engineers page 6 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 STAGE STORAGE TABLE CUSTOM STORAGE ID No. DESIGN Description: DESIGN DETENTION POND STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- 395.00 0.0000 0.0000 396.30 22725 0.5217 397.60 45450 1.0434 398.90 68175 1.5651 395.10 1748 0.0401 396.40 24473 0.5618 397.70 47198 1.0835 399.00 69923 1.6052 395.20 3496 0.0803 396.50 26221 0.6020 397.80 48946 1.1236 399.10 71671 1.6453 395.30 5244 0.1204 396.60 27969 0.6421 397.90 50694 1.1638 399.20 73419 1.6855 395.40 6992 0.1605 396.70 29717 0.6822 398.00 52442 1.2039 399.30 75167 1.7256 395.50 8740 0.2007 396.80 31465 0.7223 398.10 54190 1.2440 399.40 76915 1.7657 395.60 10488 0.2408 396.90 33213 0.7625 398.20 55938 1.2842 399.50 78663 1.8059 395.70 12237 0.2809 397.00 34962 0.8026 398.30 57687 1.3243 399.60 80412 1.8460 395.80 13985 0.3210 397.10 36710 0.8427 398.40 59435 1.3644 399.70 82160 1.8861 395.90 15733 0.3612 397.20 38458 0.8829 398.50 61183 1.4046 399.80 83908 1.9263 396.00 17481 0.4013 397.30 40206 0.9230 398.60 62931 1.4447 399.90 85656 1.9664 396.10 19229 0.4414 397.40 41954 0.9631 398.70 64679 1.4848 400.00 87404 2.0065 396.20 20977 0.4816 397.50 43702 1.0033 398.80 66427 1.5250 1/14/98 9 : 40 : 24 am Barghausen Engineers page 7 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 STAGE STORAGE TABLE CUSTOM STORAGE ID No. FINAL Description: DESIGN DETENTION POND STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- 395.00 0.0000 0.0000 396.10 24998 0.5739 397.20 49995 1.1477 398.30 74993 1.7216 395.10 2273 0.0522 396.20 27270 0.6260 397.30 52268 1.1999 398.40 77265 1.7738 395.20 4545 0.1043 396.30 29543 0.6782 397.40 54540 1.2521 398.50 79538 1.8259 395.30 6818 0.1565 396.40 31815 0.7304 397.50 56813 1.3042 398.60 81810 1.8781 395.40 9090 0.2087 396.50 34088 0.7825 397.60 59085 1.3564 398.70 84083 1.9303 395.50 11363 0.2608 396.60 36360 0.8347 397.70 61358 1.4086 398.80 86355 1.9824 395.60 13635 0.3130 396.70 38633 0.8869 397.80 63630 1.4607 398.90 88628 2.0346 395.70 15908 0.3652 396.80 40905 0.9390 397.90 65903 1.5129 399.00 90900 2.0868 395.80 18180 0.4174 396.90 43178 0.9912 398.00 68175 1.5651 395.90 20453 0.4695 397.00 45450 1.0434 398.10 70448 1.6173 396.00 22725 0.5217 397.10 47723 1.0956 398.20 72720 1.6694 1/14/98 9: 40: 24 am Barghausen Engineers page 8 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 DISCHARGE STRUCTURE LIST NOTCH WEIR ID No. 100YR Description: NOTCH WEIR OUTFLOW Weir Length: 0. 6670 ft. Weir height (p) : 2 . 7700 ft. Elevation 397. 70 ft. Weir Increm: 0. 10 COMBINATION DISCHARGE ID No. 2/5 Description: ORIFICE/WEIR COMBO Structure: 2YR Structure: Structure: 5YR Structure: Structure: MULTIPLE ORIFICE ID No. 2YR Description: RELEASE 1/2 2YR/24HR EX FLOW Outlet Elev: 394 . 93 Elev: 392 . 93 ft Orifice Diameter: 1. 5000 in. NOTCH WEIR ID No. 5YR Description: NOTCH WEIR OUTFLOW Weir Length: 0. 3330 ft. Weir height (p) : 2 . 1600 ft. Elevation : 397. 09 ft. Weir Increm: 0. 10 COMBINATION DISCHARGE ID No. COMBINE Description: ORIFICE/WEIR/OVERFLOW COMBO Structure: 2YR Structure: Structure: 5YR Structure: Structure: 100YR RISER DISCHARGE ID No. OVERFLOW Description: 100 YR RISER INFLOW Riser Diameter (in) : 12 . 00 elev: 398 . 00 ft Weir Coefficient. . . : 9.739 height: 400. 00 ft Orif Coefficient. . . : 3 . 782 increm: 0. 10 ft 1/14/98 9 : 40: 24 am Barghausen Engineers page 9 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 ---------------------------------------------------------------------- --------------------------------------------------------------------- STAGE DISCHARGE TABLE COMBINATION DISCHARGE ID No. COMBINE Description: ORIFICE/WEIR/OVERFLOW COMBO Structure: 2YR Structure: Structure: 5YR Structure: Structure: 100YR STAGE <--DISCHARGE---> STAGE -DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- (ft) ---CfS-- ------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- 394.93 0.0000 396.20 0.0688 397.50 0.3184 398.80 1.8884 395.00 0.0162 396.30 0.0715 397.60 0.3828 398.90 2.0544 395.10 0.0252 396.40 0.0740 397.70 0.4417 399.00 2.2091 395.20 0.0317 396.50 0.0765 397.80 0.5593 399.10 2.3506 395.30 0.0371 396.60 0.0789 397.90 0.7166 399.20 2.4769 395.40 0.0419 396.70 0.0812 398.00 0.8882 399.30 2.5863 395.50 0.0461 396.80 0.0835 398.10 1.0626 399.40 2.6771 395.60 0.0500 396.90 0.0857 398.20 1.2316 399.50 2.7476 395.70 0.0536 397.00 0.0878 398.30 1.3886 399.60 2.7961 395.80 0.0570 397.10 0.0910 398.40 1.5281 399.70 2.8209 395.90 0.0601 397.20 0.1293 398.50 1.6451 399.80 2.8206 396.00 0.0632 397.30 0.1867 398.60 1.7349 399.90 2.7936 396.10 0.0660 397.40 0.2516 398.70 1.7933 400.00 2.7384 1/14/98 9: 40: 27 am Barghausen Engineers page 10 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -DIS- <-PEAK-> STORAGE <--------DESCRIPTION---------> (cfs) (cfs) --id- --id- <-STAGE> id VOL (cf) 1/2 2YR/24HR DESIGN .......... 0.09 2.48 DESIGN COMBINE 397.09 2 36578.29 cf 5YR/24HR DESIGN .............. 0.28 3.06 DESIGN COMBINE 397.44 3 42722.95 cf 10YR/24HR DESIGN ............. 0.44 3.79 DESIGN COMBINE 397.70 4 47130.44 cf 100YR/24HR DESIGN ............ 0.89 5.27 DESIGN COMBINE 398.00 5 52511.62 cf 2YR/24HR FINAL ............... 0.00 2.48 FINAL COMBINE 396.64 6 37164.45 cf 5YR/24HR FINAL ............... 0.00 3.06 FINAL COMBINE 397.05 7 46628.89 cf 10YR/24HR FINAL .............. 0.00 3.79 FINAL COMBINE 397.45 8 55755.48 cf 100YR/24HR FINAL ............. 0.00 5.27 FINAL COMBINE 397.86 9 65054.45 cf WETLAND RECHARGE CALCULATIONS �57itJGr �g2{�16 � O, � Vol - 0, 6 / ,,074;Ctl VOL -.yc- O� et�NO�` �-� Z yr��2a Utz_ /Jai lG.v s chi?,, �4A� W W W / � S W Wxxx A Vf M 000 V1 O O N �na aaa C/i4 M N C4N l-� 1/15/98 2 : 32 :46 pm Barghausen Engineers page 1 QFC\WALGREENS WETLAND RECHARGE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: Al NAME: 2YR/24HR PREDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 56 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0. 56 Acres 0. 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 0. 00 TC. . . . . 72 .79 min 0. 00 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 260. 00 ns:0. 4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 01 cfs VOL: 0. 01 Ac-ft TIME: 1440 min BASIN ID: A2 NAME: 10YR/24HR PREDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.56 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0. 56 Acres 0. 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 0. 00 TC. . . . : 72 . 79 min 0. 00 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 260. 00 ns: 0.4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 03 cfs VOL: 0. 03 Ac-ft TIME: 760 min BASIN ID: A3 NAME: 100YR/24HR PREDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.56 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 56 Acres 0. 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 72 . 00 0. 00 TC. . . . . 72 . 79 min 0. 00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 260. 00 ns: 0.4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 07 cfs VOL: 0. 06 Ac-ft TIME: 520 min BASIN ID: A4 NAME: 2YR/24HR POSTDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 10 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0. 00 Acres 0. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . : 0. 00 min 6. 30 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 260. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 05 cfs VOL: 0. 01 Ac-ft TIME: 470 min 1/15/98 2 : 32 :46 pm Barghausen Engineers page 2 QFC\WALGREENS WETLAND RECHARGE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: A5 NAME: 10YR/24HR POSTDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 10 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 .90 inches AREA. . : 0. 00 Acres 0. 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98. 00 TC. . . . . 0. 00 min 6. 30 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 260. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 07 cfs VOL: 0. 02 Ac-ft TIME: 470 min BASIN ID: A6 NAME: 100YR/24HR POSTDEV TO WETLAND SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 10 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres 0 . 10 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 0. 00 98 . 00 TC. . . . . 0. 00 min 6. 30 min ABSTRACTION COEFF: 0. 20 TcReach - Sheet L: 260. 00 ns: 0. 4000 p2yr: 2 . 00 s: 0. 0115 PEAK RATE: 0. 10 cfs VOL: 0. 03 Ac-ft TIME: 470 min V. CONVEYANCE SYSTEM DESIGN AND ANALYSIS E CATCH BASIN SCHEDULE ms GRADING AND STORM DRAINAGE PLAN W tE=J9802(le7v CB/ 1,TYPE 1 CB/ 11,TYPE 1 C8/ 21,TYPE 1 it fE-J9e 01(le OF) R1N=399.2q RIM-399.0q RIM=398.7 W l+ Erat" SZW7/ IE=396.97(8� IE-396.22(8 k 127 IE=395.{2(127 Z m= 2 TYPE 1 CRCRN��M/ 2.TYPE 1 TCE.=..9.�239(JAI , Po�M--399. IE.39607(127 C84 22,.20E 2-48' it /E_ 7M✓J2 (J2T) IE=395. i __________ ....................................................................... T. 0!� TYPE 22qq , 1 r- " ' `. -__ ____ ___..___ 0 20 4 e0 ICBJ E=3 J 82(8� 398.50 23,71YPE 12-48' 00 Q Z .• .. , •-..�......__.... ____-___-__ _ _ 9 1-395 - - ---- I 1 �� tl=J9J.B5(J671.'C WNtE FENCE COF2. J 9�'2(8-) E .75(12'.157STRUCTUREO i ____ __________a_______-___-_____________-- ----------------- , PER DETAIL ________________________�_•__s__'______ .Q .CORNER CBJ4.TYPE 1 1/ 1 M- _________________ .60 8+46. t R�w,t. I e.er.y �/ TYPE RI 399.05 � M !.1 rf=J9J 9J(J6 S! _______________________________'_____________-.____.______ 399.1y IE=39682(8•) Z r , .t 13. 12 SD - IE=396+61(12'3 8� I 15'SO 022% 398:50 --_ _-T____________________ W CBJ 5,TYPE 1 CB/5,TYPE 1 RIM=398.7Q CB/24,TYPE 2-I8' 4 _ . - ___-__ -\� __ Y / RIM-399.00�� IE:395.84(8') RIM-299.4 Z Q 1 1. 1= 'OL^ - 1,6 �u-y$x�- "-- i i I I i i i i / / \\ // IE=396.59(8J IE=394.59(18") j > NETT CB 16,TYPE 2-48' > 1 I ;�• 4 3%.30 in. (�) I 11 \ / C 6.TYPE 1 RIM/--398.70 //�� r -r t0,�4 J06.63 I I I I I I / \ / 2q IE=395.58(8•h 157 398,5TYPE 2-48' W Z I V.Z 1 4G'. I yy// ~ /�p��y� © �O �C. 11 K - 1 I 1 I I 1 / I I I NL 1'HIGH \ / 396.60(8� IE=394.21(i87 W O I ; fit- 0.31 j4G.VOR'L/ S,ORM DR4WlI o, I 11 I I i 1 C [)M( FENCE Z Q PUMP SYSTEM 1 I I GB/ 17,TYPE 2-48' 1- ' I I 6 1 I RETAINMC wa.L Z - G9/ 7,TYPE 1 RIM=399.11 LL 395. RIM=398.70 IE=395.40(15� C8/26,TYPE E 2-48' Q -) W I 1 IE-396.44(87 RIM=396. 1B) J DB/ 18.TYPE 1 IE=3996 Q I. oo. A C8�8.7WE 1 RIM=39B.60 Z U I• / I,1 \ / R1Ai=399.50 IE-396.38(8� O f .90 -•..... ___ (/ IE-396.29(8'3 12' CmB/,;27�.B7Y}PE 1 W Q I I 1 I /�___��� 1 1 , o \ / CB/ 19,TYPE 1 IE=393.00(27 Q Z ��{�L I �� \ / CB/ 9•TYPE 1 RIM-398.30 WITH SUMP PUMP Q I ANCHOR \ __ 0 1 / \ / RI =398. IE-396.07(8'k 12-) (((X))) Z . . r /'HIGH IQ O iC� �1 R IIRM• I I Z 3785-3 X•I. I r= `�--- -- -- -- - \ CB/ 10.TYPE 1 fb/20.TYPE 1 „1 1C RI-399.00 I I N, POND / E=396.54(87 PoM3g B.�2-) I A I W I -- _--- - BOTTOM -Poem EL=391.0 / \ .0 I 0.37AG. I I /% 1" -- :\, 0 DETEWCIN POND-El-=395.0 EL-398.0 MITI.70P POND=399.0 - SEE DETA�ON SHEET 4 q4: ( I \ 32 LF I I II CPEP O 0.47% IZ i� \ 0.42a 1 0.�5� dc. \ -; ' ' I LEGEND (11 389.12 39u -- 'I PROPOSED TYPE II CATCH BASIN I � � +,� r-fir I 41 /28 lF 8'DI 0.24X lj / I 1 I 11 , I PROPOSED TYPE I CATCH BASIN ■ /uj L ""- - I >E �•I' (�� t`25>< 399.60 I.1R Jle7p 1 O 0.21 132 LF CPEIYO 024% 1.S 69 LF 15' P 1I ' \ I I EXSTING TYPE II CATCH BASIN I ` ► I • ]ll.ii� . I 798.70 e � 1 1 H I EXISTING TYPE I CATCH BASIN ❑ _ I :�� I = ow w o In /" A PROPOSED STORM DRAINAGE LINE (R -1 yrE v i i � I -� - - �- - = I ; - 1Z900 S�F. __-______-____- EXISTING STORM DRAINAGE LINE 400. 10� % %/ / P�-400.0 `- W PROPOSED SANITARY SEWER MANHOLE �� I � � I .I II _�� � � � � I �� / 4 � WETLAND BUFFER I I EX6TMC$IMTMY SEWER MANHOLE O U` I � �./ I � J% i / � O• ^ O y PROPOSED SANITARY SEWER LINE Q 1LW� 21 L• I I LIj� _ \ EXISTING SM411TAKY SEWER LINE _ 25 LF FLOW DISPERSAL TRENCH 11 .E ( Jl9.90.- i '� \l - + / MN. SFE N0� SEE DETAIL SHEET 9 --------- EXISTING WATERMAM _______________________ L1j�J JJ J!8 � J915. �- W � � PROPOSED WATERMAIN I Q 8 a-1 LF SD O .211[ - _T O.Yti- �a.+:F - - y, y ,L, y, EXISTING TRAFFIC SIC/4L BOX r _ bl I JW.t �-_ _ �790.80-__LJ3C_____- 7. _ _396. _ 3• .45� WERMCI I 1 EDGE OF RELOCATED WETLANDS J99.t0 701O JM.70 lii y, W y. EDGE OF EXISTING WETLANDS to 70 La v 66 _t 1 I I 0.24X - -- a 7p2\- -+--- M� •..' EXISTING DITCH - �- > N� z .24X o 3 •7 LL _.��+ • , -- --�'- ` EXISTING CONTOURS co N r, I 2 a!l eo t_ I K a;. 114 / D MODE - ^Q n oD ' I 30-2 _-___ awe ♦ a RELOCATED WETLAND PROPOSED SPOT ELEVATION ti 1. _ :- LL __ >�'}- EDGE z ____ r- ,- 0.24G. J h a -+-- - c7 RIDGE LINE ._... ...._. ._... �Z _ =aj_ : J� �✓ 1 �V 1 4J v v m r / - Y U In I!-Jed.72 _ \ l 399. I 1j I I NEW ASPHALT r*'T E1 ----- ---- --, ¢¢ iLTL ?ern - 10 L 1 I PROPOSED T 3!!. � RELOCATED NO S N ! DW �' 25' `1' L �C I L_/-TIYDS t ` 1 CONTRA OR SFYLL FIELD K RMRi Ll`_VATION K. BA( `� b .5 3! .I O�, (; wEILAND O AT EXIS NG CATCH BASIN TO BEGINNING CONSTRUCTION ���F S ✓ "' 'I VNETLAND 'A=1 pry C CONTRC ENGINEER IMMEDIATEL F THE INVERT ELEVATION P` M4 • - �� (1Z•821 S.F.) ,; VARIES ROM IF ON S �? I L R 35.00.11 0 'J I \�/ r •Y y y' y 1 I • ' ' L .81' ' ��� - TO DISPERSAL 01� -. ' �-------- ' 3. � � _ .s7 � wET REc EM -------------- J Lam_ ! _-.--_------ JLM• - WATER 8'CI. - ..-_� -- ¢ J961 GO�6J � D !�-..-----•- ------- _ ----------------------- ` IRENC FOR D - ---Esr is --^ -'- •----'------ - _ 95�t1 EX TRAF�K F-=?9I 73----- F=�NSBd___ _ _ '` EX W -- .._- EXPIRES S 88.0 ��• SIGNAL 1 - ___ J.E.-J9.IE1 .... _ = EX TR;lRC � CITY OF RENTON 170 LF 18'CPEP CONNECT To / r -0a (p J 0, 4X OEPAFi KF OF PUBLIC WORIC8 _•__-•-_ • 2 / r • Ir wft AMa AN ----------------• L-------- --------.JL:-u-w- ---------' NJE7! = e "Yf....- - ( 1 ME 5 FOR - `+__-`• [xelw•4R9rvdwe4' ...................... FOVND SURFACE MONUMENT 1�5 ____ /.E=J9J32(Ie741Y,! I10 E J9J37(J YJ ...____ •�-�. - ---•' • Stl!_05 CT._10 _ I . - DRAINAGE AREA MAP ALONQ NE 4i}1 STREET c. mv// __ Xl..Fur of Rbr•r • �- '-^--^-- ONFAFI04Y=J93 J7(IeYJ DALE 1 16 9B N5,--------------- OK1Hl DKB pC/yt 1-={D' D001c PAW W DA,L .111-m - - 2 - 11 0 1/15/98 3 : 11: 30 pm Barghausen Engineers page 1 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb01 NAME: Catch basin #1 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 19 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 01 Acres 0. 18 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 13 cfs VOL: 0. 05 Ac-ft TIME: 480 min BASIN ID: cb02 NAME: Catch basin #2 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.24 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 01 Acres 0. 23 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 16 cfs VOL: 0. 06 Ac-ft TIME: 480 min BASIN ID: cb03 NAME: Catch basin #3 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 22 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 01 Acres 0. 21 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 15 cfs VOL: 0. 06 Ac-ft TIME: 480 min BASIN ID: cb04 NAME: Catch basin #4 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.43 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 03 Acres 0.40 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 28 cfs VOL: 0. 11 Ac-ft TIME: 480 min 1/15/98 3 : 11: 30 pm Barghausen Engineers page 2 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb05 NAME: Catch basin #5 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 10 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 02 Acres 0. 08 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 06 cfs VOL: 0. 02 Ac-ft TIME: 480 min BASIN ID: cb06 NAME: Catch basin #6 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.28 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 02 Acres 0.26 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 18 cfs VOL: 0. 07 Ac-ft TIME: 480 min BASIN ID: cb07 NAME: Catch basin #7 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 19 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 02 Acres 0. 17 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 12 cfs VOL: 0. 05 Ac-ft TIME: 480 min BASIN ID: cb08 NAME: Catch basin #8 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 16 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 02 Acres 0. 14 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 10 cfs VOL: 0. 04 Ac-ft TIME: 480 min 1/15/98 3 : 11: 30 pm Barghausen Engineers page 3 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb09 NAME: Catch basin #9 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 25 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 02 Acres 0. 23 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 16 cfs VOL: 0. 06 Ac-ft TIME: 480 min BASIN ID: cb10 NAME: Catch basin #10 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.25 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 02 Acres 0. 23 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 16 cfs VOL: 0. 06 Ac-ft TIME: 480 min BASIN ID: cbll NAME: Catch basin #11 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.42 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 03 Acres 0. 39 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0.28 cfs VOL: 0. 11 Ac-ft TIME: 480 min BASIN ID: cb12 NAME: Catch basin #12 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 19 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 02 Acres 0. 17 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 12 cfs VOL: 0. 05 Ac-ft TIME: 480 min 1/15/98 3 : 11: 30 pm Barghausen Engineers page 4 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb13 NAME: Catch basin #13 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 64 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 04 Acres 0. 60 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 42 cfs VOL: 0. 16 Ac-ft TIME: 480 min BASIN ID: cb14 NAME: Catch basin #14 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 09 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 03 Acres 0. 06 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 05 cfs VOL: 0. 02 Ac-ft TIME: 480 min BASIN ID: cb15 NAME: Catch basin #15 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 17 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 01 Acres 0. 16 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 11 cfs VOL: 0. 04 Ac-ft TIME: 480 min BASIN ID: cb16 NAME: Catch basin #16 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 23 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 02 Acres 0. 21 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 15 cfs VOL: 0. 06 Ac-ft TIME: 480 min 1/15/98 3 : 11: 30 pm Barghausen Engineers page 5 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb17 NAME: Catch basin #17 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 37 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 04 Acres 0. 33 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 24 cfs VOL: 0. 09 Ac-ft TIME: 480 min BASIN ID: cb18 NAME: Catch basin #18 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.27 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 01 Acres 0. 26 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 18 cfs VOL: 0. 07 Ac-ft TIME: 480 min BASIN ID: cb19 NAME: Catch basin #19 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.21 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 02 Acres 0. 19 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0. 14 cfs VOL: 0. 05 Ac-ft TIME: 480 min BASIN ID: cb20 NAME: Catch basin #20 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.71 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .40 inches AREA. . : 0. 00 Acres 0.71 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 49 cfs VOL: 0. 19 Ac-ft TIME: 480 min 1/15/98 3 : 11: 31 pm Barghausen Engineers page 6 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: cb21 NAME: Catch basin #21 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.40 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 00 Acres 0. 40 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80. 00 98. 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 27 cfs VOL: 0. 11 Ac-ft TIME: 480 min BASIN ID: cb22 NAME: Catch basin #22 SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0. 19 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 40 inches AREA. . : 0. 02 Acres 0. 17 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 80 . 00 98 . 00 TC. . . . : 10. 00 min 10. 00 min ABSTRACTION COEFF: 0. 20 PEAK RATE: 0. 12 cfs VOL: 0. 05 Ac-ft TIME: 480 min 1/15/98 3 : 11: 31 pm Barghausen Engineers page 7 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres 1 4 . 076 480 68818 cf 6. 20 1/15/98 3 : 11: 38 pm Barghausen Engineers page 8 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY Network Reach N01 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfuLL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P01 0.19 0.67 64.00 0.0023 0.0120 0.13 18.43 0.20 30.19 1.42 2.01 cb01 P02 0.43 0.67 90.00 0.0024 0.0120 0.29 41.00 0.31 46.49 1.80 2.05 cb02 Network Reach NO3 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfuLL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P03 0.22 0.67 128.00 0.0020 0.0120 0.15 23.02 0.23 33.90 1.41 1.87 cb03 Network Reach N04 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfuLL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N01 Confluence with Network NO3 PO4 1.08 1.00 131.00 0.0024 0.0120 0.72 35.31 0.43 42.73 2.23 2.65 cb04 Network Reach N05 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfuLL C Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P05 0.10 0.67 64.00 0.0020 0.0120 0.06 9.54 0.14 21.63 1.09 1.87 cb05 Network Reach N06 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P06 0.28 0.67 68.00 0.0021 0.0120 0.18 28.67 0.25 38.12 1.50 1.88 cb06 Network Reach N07 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth Y.Depth Vact VfuLL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N05 Confluence with Network N06 P07 0.57 0.67 67.00 0.0019 0.0120 0.37 58.95 0.39 57.81 1.75 1.83 cb07 1/15/98 3 : 11: 39 pm Barghausen Engineers page 9 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY Network Reach N08 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfulL C Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N04 Confluence with Network N07 P08 1.81 1.00 65.00 0.0025 0.0120 1.18 57.30 0.57 56.77 2.57 2.70 cb08 P09 2.06 1.00 173.00 0.0024 0.0120 1.35 65.65 0.62 62.01 2.63 2.68 cb09 Network Reach N10 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfulL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P10 0.25 0.67 128.00 0.0023 0.0120 0.16 23.91 0.23 34.60 1.52 2.01 cb10 P11 0.67 1.00 65.00 0.0025 0.0120 0.44 21.24 0.33 32.50 1.98 2.70 cbll P12 0.86 1.00 132.00 0.0023 0.0120 0.56 27.81 0.37 37.49 2.09 2.64 cbl2 Network Reach N13 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N08 Confluence with Network N10 P13 3.56 1.25 78.00 0.0026 0.0120 2.33 60.95 0.74 59.06 3.09 3.20 cbl3 Network Reach N14 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfulL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P14 0.09 0.67 118.00 0.0025 0.0120 0.05 7.03 0.12 18.62 1.12 2.09 cbl4 P15 0.26 0.67 78.00 0.0027 0.0120 0.16 22.17 0.22 33.25 1.60 2.15 cbl5 Network Reach N16 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth Y.Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N13 Confluence with Network N14 P16 4.05 1.25 84.00 0.0021 0.0120 2.64 75.60 0.86 68.48 2.95 2.92 cb16 P17 4.42 1.25 151.00 0.0021 0.0120 2.88 84.19 0.93 74.56 2.93 2.86 cbl7 1/15/98 3 : 11: 39 pm Barghausen Engineers page 10 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY Network Reach N18 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact Vfull C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) P18 0.27 0.67 130.00 0.0020 0.0120 0.18 28.61 0.25 38.08 1.48 1.86 cb18 P19 0.48 1.00 140.00 0.0020 0.0120 0.32 17.00 0.29 28.96 1.68 2.43 cb19 P20 1.19 1.00 130.00 0.0020 0.0120 0.80 43.06 0.48 47.82 2.16 2.43 cb20 P21 1.59 1.00 132.00 0.0020 0.0120 1.07 58.18 0.57 57.33 2.31 2.41 cb21 Network Reach N22 REACH <-AREA> <-DIA> LENGTH SLOPE < n > DSGN Q % PIPE Ndepth %Depth Vact VfuLL C_Area ID (Ac) (ft) (ft) ft/ft ------ (cfs) ------ (ft) ------ (fps) (fps) Confluence with Network N16 Confluence with Network N18 P22 6.20 1.50 29.00 0.0017 0.0120 4.08 79.98 1.07 71.50 3.02 2.96 cb22 PIPE REACH ID No. P01 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 64 . 0000 ft s: 0. 0023 Up invert : 397. 5000 ft down invert: 397 . 3500 ft Collection Area: 0. 1900 Ac. Design Flow 0. 1260 cfs Dsgn Depth: 0. 20 ft Pipe Capacity 0. 6836 cfs Design Vel 1. 4183 fps Travel Time: 0.75 min Pipe Full Vel 2 . 0098 fps PIPE REACH ID No. P02 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 90. 0000 ft s: 0. 0024 Up invert : 397 . 3500 ft down invert: 397 . 1300 ft Collection Area: 0. 4300 Ac. Design Flow 0. 2862 cfs Dsgn Depth: 0. 31 ft Pipe Capacity 0. 6981 cfs Design Vel 1. 8006 fps Travel Time: 0. 83 min Pipe Full Vel 2 . 0525 fps 1/15/98 3 : 11: 39 pm Barghausen Engineers page 11 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY PIPE REACH ID No. P03 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length : 128 . 0000 ft s: 0. 0020 Up invert : 397 . 3900 ft down invert: 397 . 1300 ft Collection Area: 0.2200 Ac. Design Flow 0. 1465 cfs Dsgn Depth: 0. 23 ft Pipe Capacity 0. 6364 cfs Design Vel 1.4055 fps Travel Time: 1. 52 min Pipe Full Vel 1.8710 fps PIPE REACH ID No. PO4 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 131. 0000 ft s: 0. 0024 Up invert : 397 . 1300 ft down invert: 396. 8200 ft Collection Area: 1. 0800 Ac. Design Flow 0. 7151 cfs Dsgn Depth: 0. 43 ft Pipe Capacity 2 . 0252 cfs Design Vel 2 . 2328 fps Travel Time: 0. 98 min Pipe Full Vel 2 . 6463 fps PIPE REACH ID No. P05 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 64 . 0000 ft s: 0. 0020 Up invert : 397 . 0800 ft down invert: 396.9500 ft Collection Area: 0. 1000 Ac. Design Flow 0. 0607 cfs Dsgn Depth: 0. 14 ft Pipe Capacity 0. 6364 cfs Design Vel 1. 0921 fps Travel Time: 0. 98 min Pipe Full Vel 1.8710 fps PIPE REACH ID No. P06 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 68. 0000 ft s: 0. 0021 Up invert : 397. 0900 ft down invert: 396.9500 ft Collection Area: 0. 2800 Ac. Design Flow 0. 1837 cfs Dsgn Depth: 0. 25 ft Pipe Capacity 0. 6407 cfs Design Vel 1.5028 fps Travel Time: 0.75 min Pipe Full Vel 1.8837 fps 1/15/98 3 : 11: 39 pm Barghausen Engineers page 12 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY PIPE REACH ID No. P07 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 67 . 0000 ft s: 0. 0019 Up invert : 396.9500 ft down invert: 396. 8200 ft Collection Area: 0. 5700 Ac. Design Flow 0. 3666 cfs Dsgn Depth: 0. 39 ft Pipe Capacity 0. 6220 cfs Design Vel 1.7535 fps Travel Time: 0. 64 min Pipe Full Vel 1.8286 fps PIPE REACH ID No. P08 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length 65. 0000 ft s: 0. 0025 Up invert : 396. 8200 ft down invert: 396. 6600 ft Collection Area: 1. 8100 Ac. Design Flow 1. 1834 cfs Dsgn Depth: 0. 57 ft Pipe Capacity 2 . 0655 cfs Design Vel 2 . 5714 fps Travel Time: 0. 42 min Pipe Full Vel 2 . 6989 fps PIPE REACH ID No. P09 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 173 . 0000 ft s: 0. 0024 Up invert : 396. 6600 ft down invert: 396. 2400 ft Collection Area: 2 . 0600 Ac. Design Flow 1. 3466 cfs Dsgn Depth: 0. 62 ft Pipe Capacity 2 . 0512 cfs Design Vel 2 . 6319 fps Travel Time: 1. 10 min Pipe Full Vel 2 . 6803 fps PIPE REACH ID No. P10 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length : 128. 0000 ft s: 0. 0023 Up invert : 397. 0200 ft down invert: 396. 7100 ft Collection Area: 0. 2500 Ac. Design Flow 0. 1632 cfs Dsgn Depth: 0. 23 ft Pipe Capacity 0. 6824 cfs Design Vel 1. 5228 fps Travel Time: 1. 40 min Pipe Full Vel 2 . 0064 fps 1/15/98 3 : 11: 40 pm Barghausen Engineers page 13 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY PIPE REACH ID No. P11 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length 65. 0000 ft s: 0. 0025 Up invert : 396. 7100 ft down invert: 396. 5500 ft Collection Area: 0. 6700 Ac. Design Flow 0. 4388 cfs Dsgn Depth: 0. 33 ft Pipe Capacity 2 . 0655 cfs Design Vel 1.9819 fps Travel Time: 0. 55 min Pipe Full Vel 2 . 6989 fps PIPE REACH ID No. P12 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 132 . 0000 ft s: 0. 0023 Up invert : 396. 5500 ft down invert: 396. 2400 ft Collection Area: 0. 8600 Ac. Design Flow 0. 5610 cfs Dsgn Depth: 0. 37 ft Pipe Capacity 2 . 0175 cfs Design Vel 2 . 0857 fps Travel Time: 1. 05 min Pipe Full Vel 2 . 6362 fps PIPE REACH ID No. P13 From: To: Pipe Diameter: 1.2500 ft n: 0.0120 Pipe Length 78. 0000 ft s: 0. 0026 Up invert : 396.2400 ft down invert: 396. 0400 ft Collection Area: 3 .5600 Ac. Design Flow 2 .3297 cfs Dsgn Depth: 0. 74 ft Pipe Capacity 3 . 8222 cfs Design Vel 3 . 0883 fps Travel Time: 0.42 min Pipe Full Vel 3 . 1964 fps PIPE REACH ID No. P14 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length : 118 . 0000 ft s: 0. 0025 Up invert : 396. 5500 ft down invert: 396. 2500 ft Collection Area: 0. 0900 Ac. Design Flow 0. 0501 cfs Dsgn Depth: 0. 12 ft Pipe Capacity 0. 7120 cfs Design Vel 1. 1168 fps Travel Time: 1. 76 min Pipe Full Vel 2 . 0932 fps 1/15/98 3 : 11: 40 pm Barghausen Engineers page 14 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY PIPE REACH ID No. P15 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length 78 . 0000 ft s: 0. 0027 Up invert : 396. 2500 ft down invert: 396. 0400 ft Collection Area: 0. 2600 Ac. Design Flow 0. 1624 cfs Dsgn Depth: 0. 22 ft Pipe Capacity 0.7327 cfs Design Vel 1. 6005 fps Travel Time: 0. 81 min Pipe Full Vel 2 . 1541 fps PIPE REACH ID No. P16 From: To: Pipe Diameter: 1.2500 ft n: 0. 0120 Pipe Length 84 . 0000 ft s: 0. 0021 Up invert : 396. 0400 ft down invert: 395. 8600 ft Collection Area: 4 . 0500 Ac. Design Flow 2 . 6417 cfs Dsgn Depth: 0. 86 ft Pipe Capacity 3 . 4941 cfs Design Vel 2 .9493 fps Travel Time: 0. 47 min Pipe Full Vel 2 .9221 fps PIPE REACH ID No. P17 From: To: Pipe Diameter: 1. 2500 ft n: 0. 0120 Pipe Length : 151. 0000 ft s: 0. 0021 Up invert : 395. 8600 ft down invert: 395. 5500 ft Collection Area: 4 .4200 Ac. Design Flow 2 . 8792 cfs Dsgn Depth: 0.93 ft Pipe Capacity 3 .4201 cfs Design Vel 2 .9342 fps Travel Time: 0. 86 min Pipe Full Vel 2 .8602 fps PIPE REACH ID No. P18 From: To: Pipe Diameter: 0. 6667 ft n: 0. 0120 Pipe Length : 130. 0000 ft s: 0. 0020 Up invert : 396. 6100 ft down invert: 396. 3500 ft Collection Area: 0. 2700 Ac. Design Flow 0. 1807 cfs Dsgn Depth: 0. 25 ft Pipe Capacity 0. 6315 cfs Design Vel 1. 4803 fps Travel Time: 1. 46 min Pipe Full Vel 1.8566 fps 1/15/98 3 : 11:40 pm Barghausen Engineers page 15 QFC\WALGREENS - RENTON, WA STORM DRAINAGE CONVEYANCE CALCULATIONS BCE # 6116 REACH SUMMARY PIPE REACH ID No. P19 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 140. 0000 ft s: 0. 0020 Up invert : 396. 3500 ft down invert: 396. 0700 ft Collection Area: 0.4800 Ac. Design Flow 0. 3166 cfs Dsgn Depth: 0. 29 ft Pipe Capacity 1.8618 cfs Design Vel 1. 6774 fps Travel Time: 1. 39 min Pipe Full Vel 2 .4328 fps PIPE REACH ID No. P20 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 130. 0000 ft s: 0. 0020 Up invert : 396. 0700 ft down invert: 395. 8100 ft Collection Area: 1. 1900 Ac. Design Flow 0.8017 cfs Dsgn Depth: 0. 48 ft Pipe Capacity 1.8618 cfs Design Vel 2 . 1616 fps Travel Time: 1. 00 min Pipe Full Vel 2 . 4328 fps PIPE REACH ID No. P21 From: To: Pipe Diameter: 1. 0000 ft n: 0. 0120 Pipe Length : 132 . 0000 ft s: 0. 0020 Up invert : 395.8100 ft down invert: 395. 5500 ft Collection Area: 1.5900 Ac. Design Flow 1. 0750 cfs Dsgn Depth: 0. 57 ft Pipe Capacity 1.8476 cfs Design Vel 2 . 3083 fps Travel Time: 0. 95 min Pipe Full Vel 2 . 4143 fps PIPE REACH ID No. P22 From: To: Pipe Diameter: 1. 5000 ft n: 0. 0120 Pipe Length 29 . 0000 ft s: 0. 0017 Up invert : 395. 5500 ft down invert: 395. 5000 ft Collection Area: 6. 2000 Ac. Design Flow 4. 0764 cfs Dsgn Depth: 1. 07 ft Pipe Capacity 5. 0966 cfs Design Vel 3 . 0152 fps Travel Time: 0. 16 min Pipe Full Vel 2 . 9599 fps VI. SPECIAL REPORT AND STUDY RENTON HIGHLANDS SHOPPING CENTER NE 4th ST. and DUVALL AVE. NE - CITY OF RENTON, WA CONCEPTUAL WETLAND MITIGATION REPORT Prepared For: JMR PACIFIC Bellevue,Washington Prepared By: TALASAEA CONSULTANTS Woodinville, Washington November 6, 1997 RENTON HIGHLANDS SHOPPING CENTER NE 4th ST. and DUVALL AVE. NE - CITY OF RENTON, WA CONCEPTUAL WETLAND MITIGATION REPORT Prepared for.• JMR Pacific 600 - 1081 Ave. NE, Suite 343 Bellevue, WA 98004 Prepared by. Talasaea Consultants 15020 Bear Creek Road NE Woodinville, Washington 98072 November 6, 1997 TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 2.0 DEVELOPMENT IMPACTS ON WETLANDS 1 3.0 MITIGATION FOR WETLAND IMPACTS 1 3.1 Goals and Objectives 2 3.2 Plantings 2 3.3 Habitat Features 2 4.0 CONSTRUCTION MANAGEMENT 3 5.0 MONITORING METHODOLOGY 3 5.1 Vegetation 3 5.2 Wildlife 3 5.3 Water Quality and Hydrology 4 6.0 SUCCESS CRITERIA 4 7.0 MAINTENANCE (NI)AND CONTINGENCY (C) 4 8.0 PERFORMANCE BOND 5 9.0 AS-BUILT PLAN 5 LIST OF FIGURES 1. Location Map 2. Proposed Site Plan & Wetland Mitigation Concept APPENDICES A. Wetlands Evaluation and Delineation Report prepared by Watershed Dynamics, Inc. RENTON HIGHLANDS SHOPPING CENTER NE 4th ST. and DUVALL AVE. NE - CITY OF RENTON, WA CONCEPTUAL WETLAND MITIGATION REPORT November 6, 1997 1.0 INTRODUCTION The subject property consists of approximately 8.5 acres located at the northeast corner of NE 4th Street and Duvall Avenue NE in the City of Renton, Washington (Figure 1). A Wetlands Evaluation and Delineation Report was prepared for the site by Watershed Dynamics, Inc. (WDI) in 1995, and has been included with this document as Appendix A. The results of the WDI wetland study were subsequently reviewed by Talasaea in June of 1997 and appear to be accurate. Two wetlands (Wetland A and Wetland B) approximately 0.52 acres (22,913 s.f.) in total on-site size were identified and delineated by WDI as part of their,evaluation (Figure 2). Wetland A (12,948 s.f., on-site) extends slightly off-site to the east, while Wetland B (9,965 s.f.) appears to be isolated within the study property. Wetland A is connected hydrologically, via a culvert under NE 4th Street, to an area located off-site to the south which is identified on the City of Renton's Wetland Inventory as Wetland 21 K. According to the City of Renton's Wetland Management Regulations, both Wetland A and Wetland B would meet the definition of a Category 3 wetland. The proposed project consists of the construction of a mixed commercial retail development containing a QFC store and other retail shops. 2.0 DEVELOPMENT IMPACTS ON WETLANDS Wetland A, the higher value wetland on the site, will be preserved following construction (Figure 2). The proposed project does, however, require the filling and grading of Wetland B for a total wetland impact of 9,965 s.f. (0.23 acres). Although approximately 8,165 s.f. of impact to Wetland B will occur as a result of direct fill due to grading, the remaining 1,800 s.f. of Wetland B will be incorporated into the design of the stormwater facility for the site. Following construction, the portion of Wetland B located within the stormwater facility should retain some of the functions it currently provides (i.e., stormwater storage and water quality protection). 3.0 MITIGATION FOR WETLAND IMPACTS Mitigation for the 9,965 s.f. of impact to Wetland B will occur as approximately 9,965 s.f. (1:1 replacement to loss ratio) of wetland creation adjacent to the west edge of Wetland A to form a larger, more diverse wetland system. Although the City of Renton generally requires a 1.5:1 replacement to loss ratio for Category 3 wetlands, this ratio can be reduced if other types of mitigation are provided. Compensation for the reduction of the replacement to loss ratio will occur through enhancement of the stormwater facilities on the site. These enhancement measures will include planting the stormwater storage ponds with a variety of native trees and shrubs to increase their habitat value. By integrating the landscape of the ponds with that of Wetland A and its buffer, it is anticipated that an overall benefit will be achieved. 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CONSULTANTS T Faso c.a 4 BwirorrnerTtal Plcmhg Renton, Washington DATE 1'3020 Bear meek Food►mot t -7-I6-9-1 FbodkMlb,Ydmhkgtan Abam Bus(.06)661--1550-Fcoc C206)661-1549 CANDIDATE L 15T OF PLANT 5PEG I E5 ! f / TREE5/LARGE SHRUB, 1 SGIENTIFIG NAME COMMON NAME 51ZE AGER CIRGINATUM VINE MAPLE 5'-6' ht., 5 stem min. WL FRAXINU5 LATIFOLIA ORE60N A5H &'-10' ht., 15" cal. min. ONDS PLANTED HOLOD15G4,1 G 5 D15GOLOR OEANSPRAY 5 gal., 5 stem min. V ANG1•�OR 2 QFC ANCHOR Q ► , NATIVE SPECIES OEMLERIA GERA5IFORMI5 050BERRY 5 gal., 5 stem min. POPULUS TREMULOIDES QUAKING ASPEN 8'-10' ht., IS" cal. min. Mf-WfiD�';T97S ! in ` ° '°" ''" �' = 5'-6' ht., full h bus t ' :. u °^ PSEUDOT5U6A MENZIE511 DOUGLAS FIR by 5ALIX 5PP. WILLOW 5 gal., 5 stem min. THUJA PLIGATA W. RED CEDAR 5'-6' ht., full bushy 1 _ : ; SHRUBS f 5GIENTIFIG NAME COMMON NAME SIZE 6A.LTHERIA SHALLON 5ALAL I gal., 24" ht., 3 stem min. MAHONIA AQUIFOLIUM TALL ORE60NGRAPE 2 gal., 24" ht., 3 stem min. W l l RIBE5 SANOUINRH RED CURRANT 2 gal., 24" ht., 3 stem min. Ni y \ ` FILLED HETLAND B 1 ROSA P1506ARPA GLU5TERED R05E 2 gal., 24" ht., 3 stem min. Qa65 SF 5YMPHORIGARP05 ALBUS SNOWBERRY 2 gal., 24" ht., 3 stem min. ; E , r f• ` ENHANCED VETLAND d) ! Bt1FFER - 15,500 SF PLANTED WITH NATIVE SPECIES W L INLAND MITIGATION AREA - 12,621 SF ji %''�';' /'�';'; W W I W W W W • PENERAL NOTE-5 1 ( _ l� • ','' '' ,' W W W I. THIS 15 A GONGEPT PLAN ONLY AND SHALL NOT BE USED FOR GON5TRUGTION PURPOSES. W HETL AM 'yy■ W 2. 51TE PLAN HAS PREPARED BY BARGHAUSEN GONSULTING W W W W ENGINEERS, ING. - DATED II/4/9-I. ,', ' ,', 41 W W W W 5. HYDROLOGY FOR CREATED HETLAND AND HETLAND A SHALL BE SUPPLIED BY TREATED AND DETAINED �, W W W W W• 5TORMHATER RUNOFF. THE FINAL PLAN WILL DEPIGT / QUANTITIES. W W W W 41 - _ ----_---_________ ' ----W-------- a' N.E. 4th ST. \- (S E. 12&th STD TREATED STORM- North INTO VETLAND AREA DESIGN FIGURE 2: Proposed Site Plan 4 SO. A 77 TALASAEA Hethand Mitigation Goncept N5-ALECONSULTANTS Renton Highlands Gtr. - 0 �O �O160 �1500220` cfeee Road lNortheoscPlomi� W DATE Renton, ashington II-6-�{"7 Wooc,YMlle,s*"hh*m 46M2 ek s(206)961-T550-Fax(206)4561-754q RF/F5� Additional compensation for the reduced replacement ratio will include preservation of the significant upland trees located in the mitigation area. As depicted on Figure 2, the mitigation area is 12,821 s.f. and only 9,965 s.f. will be created wetland. The remaining area will be preserved upland trees (primarily Douglas fir). The final plan will depict the location of the trees and how the proposed mitigation will be located around most of them. Preservation of these trees as "upland islands" increases the habitat value of the overall wetland system and provides better protection to the existing wetlands. In addition, the 15,500 s.f. wetland buffer (25' minimum) will be enhanced with dense understory vegetation (e.g., tall oregongrape and rose) to create a stronger physical barrier. 3.1 Goal and Objectives Goal: Create a replacement wetland and enhance the stormwater facilities on the site to compensate for impacting 9,965 s.f. of wetland (Wetland B). Objectives: • Create 9,965 s.f. of wetland adjacent to Wetland A to create a larger, more diverse wetland system. • Increase plant species and structural diversity throughout the created wetland and its buffer, as well as the stormwater facilities for the project. • Incorporate habitat features (e.g., snags, downed logs, and other woody material) into the created wetland and its buffer. • Remove and control invasive and exotic species in all wetland and buffer areas. • Simulate pre-construction wetland hydrology by supplying the existing and created wetland with a portion of the previously detained roof-top runoff and treated stormwater from the site. 3.2 Plantings The candidate plant species used in the mitigation concept were chosen for a variety of qualities, including: adaptation to specific water regimes, value to wildlife, value as a physical or visual barrier, size, pattern of growth (structural diversity), and aesthetic value. These native plantings will increase both the structural and plant species diversity within the wetland and buffer areas, thereby increasing the area's value to wildlife. 3.3 Habitat Features Snags, stumps, and down logs will be incorporated into the mitigation area to provide ecologically important habitat features. These habitat features will be relocated from areas on the project site that will be cleared for development. Snags provide both perching and nesting sites for a variety of native birds. Cavity nesting bird species, such as chickadees and woodpeckers could be expected to utilize such features. Down logs provide the slow release of nutrients as the wood decays, and also provide cover for amphibians, small mammals, and other wildlife. Other structures to be installed for further enhancement of wildlife habitat value include bird nesting boxes. Renton Highlands Shopping Center-Renton,WA Conceptual Wetland Mitigation Report 2 378mit2.rpt-November 6, 1997 4.0 CONSTRUCTION MANAGEMENT Prior to commencement of any work by contractors in the mitigation areas, the clearing and construction limits will be staked, grade staking will be completed, and fencing will be installed around all existing vegetation to be saved. A pre- construction meeting will be held at the construction site to review and discuss all aspects of the project with the selected contractor. A wetland biologist will supervise plan implementation during construction to ensure that objectives and specifications of the mitigation plan are met. Any modifications to the design that may be necessary due to unforeseen site conditions will be jointly approved by the City of Renton and the wetland biologist prior to their implementation. 5.0 MONITORING METHODOLOGY As required by the City of Renton, the monitoring program will be conducted for a period of five years, with reports submitted to the City according to the following schedule: • quarterly for the first year following construction • annually (at the end of the growing season) for the second through fifth years 5.1 Vegetation Permanent vegetation sampling points or transects will be established at selected locations to incorporate all of the representative plant communities. The same monitoring locations will be re-visited each year with a record kept of all plant species found. Vegetation will be recorded on the basis of relative percent cover of the dominant species within the vegetative strata. All monitoring will be conducted by a qualified biologist. Photo-points will be established from which photographs will be taken throughout the monitoring period. These photographs will document general appearance and progress in plant community establishment in the mitigation and restoration areas. Review of the photos over time will provide a semi-quantitative representation of success of the planting plan. Monitoring and photo-point locations will be shown and described in the first monitoring report. 5.2 Wildlife Birds, mammals, reptiles, amphibians and invertebrates which are readily observable (either by direct or indirect means) will be identified and recorded in the wetland and buffer areas. Direct observations include actual sightings, while indirect observations include tracks, scat, nests, song, or other indicative signs. The kinds and locations of the habitat with greatest use by each species will be noted, as will any breeding or nesting activities. Renton Highlands Shopping Center-Renton,WA Conceptual Wetland Mitigation Report 3 378mit2.rpt-November 6, 1997 5.3 Water Quality and Hydrology During each monitoring event, an assessment will be made of the water regime within the mitigation area to ensure that proper hydrological conditions exist within both the wetland and its buffer. General observations will be made of the extent and depth of soil saturation or inundation. Water quality will be assessed qualitatively, unless it is evident there is a serious problem. In such an event, water quality samples will be taken and analyzed in a laboratory for suspected parameters. Qualitative assessments of water quality include: 1. oil sheen or other surface films, 2. abnormal color of water or odor, 3. stressed or dead vegetation or aquatic fauna, and 4. turbidity. 6.0 SUCCESS CRITERIA Success of plant establishment within the mitigation area will be evaluated on the basis of both percent survival and percent cover of desirable species. Undesirable species include exotic and invasive species such as Scot's broom, Himalayan and evergreen blackberry, reed canarygrass, purple loosestrife, morning glory, Japanese knotweed, and creeping nightshade. For woody planted species, success will be based on at least an 85% survival rate of all planted trees and shrubs, or at least 80% cover of equivalent recolonized native species, by the end of the five-year monitoring period. Success for herbaceous species will be based on an 80% cover of desirable plant species by the end of the 5-year monitoring period. Undesirable plant species will be maintained at levels below 20% total cover. Removal of these species will occur immediately following the monitoring event in which they surpass the 20% maximum coverage. Removal will occur by hand whenever possible. No chemical treatment will be employed without prior approval by the City. 7.0 MAINTENANCE (M)AND CONTINGENCY (C) Established performance standards for the project will be compared to the monitoring results in order to judge the success of the mitigation and restoration project. Contingency will include the items listed below and would be implemented if these performance standards are not met. Maintenance and remedial action on the site will be implemented immediately upon completion of the monitoring event (unless otherwise specifically indicated below). • replace dead plants with the same species or a substitute species that meets the goals and objectives of the plan (C) • re-plant areas after reason for failure has been identified (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc.) (C) • line wetland areas with impermeable material where hydrology is deemed to be insufficient to support the desired wetland plant community. Where Renton Highlands Shopping Center-Renton,WA Conceptual Wetland Mitigation Report 4 378mit2.rpt-November 6, 1997 appropriate, liners may be installed immediately upon completion of grading to increase probability of wetland success (C) • irrigate with a temporary system for at least one full growing season following plant installation (M) • after consulting with City staff- minor excavation, as needed, to correct alterations of surface drainage patterns (C) • remove/control weedy or exotic invasive plants (e.g., Scot's broom, reed canarygrass, Himalayan blackberry, purple loosestrife, etc.) by manual or chemical means approved by the City of Renton. Use of herbicides or pesticides within the mitigation area would only be implemented if other measures failed or were considered unlikely to be successful, and would require prior agency approval (C & M) • clean-up trash and other debris (M) • clear or repair trash racks, culverts, etc. (M) • selectively prune woody plants to meet the plan's goals and objectives (e.g., thinning and removal of dead or diseased portions of trees/shrubs) (M) 8.0 PERFORMANCE BOND A performance bond will be posted with the City of Renton by the property owner for the cost of replacement of plantings and the 5-year monitoring plan to assure the success of the mitigation and restoration plan. The bond may be released in partial amounts in proportion to work successfully completed over the 5-year monitoring period as the applicant demonstrates performance for implementing the conditions of the plan. 9.0 AS-BUILT PLAN Following completion of construction activities, a set of"as-built" plans for the wetland mitigation area will be provided to the City of Renton. The plans will identify and describe any City-approved changes in grading, planting or other constructed features in relation to the original approved plan. Renton Highlands Shopping Center-Renton,WA Conceptual Wetland Mitigation Report 5 378mit2.rpt-November 6, 1997 APPENDIX A Wetlands Evaluation and Delineation Report Prepared by Watershed Dynamics, Inc. IETLANDS EVALUATION AND DELINEAT1. REPORTS u E. ,. , t ., t• t i i f i~ •'� r' -{'ri;qq� Yj'n„<�}��,y4y��a�s [x� Vtr l�< 4<• 4. 7 l yj, 1.;Q �•'+Y'+. yl t� r .. �y� - i t•^ �'•4 .tr N; �+'�' > ',F r•+r51rYt", , t' r ,FL r.i.F 1 tLwle k�rr x�t"yry ,7cK,fj P:f'i,` �ltvF N ♦,. �'YQ flA ', T Rep r. �.�'�: +.4.� stytt<��')r• ; !'��.r�e�N�{i+�W��Ytirx�� .f.'S�-h1i' ,<, � { Y .e«z�.�J��'rw� a�+P,n4�fsr��'Y �l�, .t,`��•� `; rA C�fi4` f , "c<' I�f7� � RC�PI=RTY° "r' N'Fs.�` � �k '��." r. ,Sf A �f !a irGi.'�3�.*rP' Fti�'yir i`� .> v 13 r'�r Fv� ?Es IYYi�ti �'it�y" �y����-a' '"h�k ��. � �`r+����•� tr �i -i 4 i� t }_.i Mt��� `rY'�-`1.�Y^�.,l i7t t t #��'t'. �ti.. _ f� y"a •( i, ;t:�rFt-sec �aT.k'' x Y: � rsM>• .-M>1}�.,[�--�y �`S t'!t.S-�t� .�.G}y ��••: i„}�.. ' L aaF�k+f'��. tvMJr/"a \h"'•>.,�s^4 2," �+♦ �t� � a .lS ,rxt.,, !i tri ,✓� a •;r Y �� r v s.. .a�.i t �.?r < '";G� �fF" ' ma's��t µFM *:�!^•�������^4F����l.+C��w� "��+n Z4�� � ,l' �v� � ��wµ�r�r'�`7�c ,•+ r•'Ifi•S .J!L1G1� � i.'�'A1tw�•4 r�.,� ::F.�:�1..Y� 4�� "� - _ �j�� ��rM�.iv ri.:.a��- ew...ter.:...wu>.. •,s+.iw..:>...vfw+vaata.<..��.-.�--a.. Lit ,i., S "�. "atS"�L�j< �,) x.R�•-c t `-�f .> ar !`�ra- iC tc "+G'v�r .L. ,rC' aey.. z h+ �� �r`t' sue":� t d i�,, r y„ta i- '+�S�i�'eT�7'��^i:�'6.'-.5. �a�.-. WATERSHED DYNAMICS, INC . EXECUTIVE SUMMARY The Tibbott Project Site is located within the City of Renton, King County, Washington. Watershed Dynamics, Inc. (WDI) was retained to provide an evaluation of wetland characteristics following the procedures outlined in the Federal Manual for Identifying and Delineating Jurisdictional Wetlands,(1989 manual). Two wetland areas (Wetland A and Wetland B) approximately 0.52 acres in total size (22,9130 sq. ft) were identified and delineated within the project site. These wetlands appeared to meet the following United States Fish and Wildlife Service wetland classifications: Wetland A -Palustrine, Forested, Seasonally Flooded (PFOC) Wetland B - Palustrine, Scrub/Shrub, Seasonally Flooded (PSSC) Wetland A (12,948 sq. ft onsite) extended slightly offsite to the east. Wetland B (9,965 sq. ft onsite) appeared to be isolated within the study property. Wetland A was connected hydrologically, via a culvert, to an area located offsite to the south which is identified within the City of Renton Wetlands Inventory as Wetland W21 K. An assessment of the onsite wetland using City of Renton Wetland Management Regulations (Ordinance #4346) identified both Wetland A and Wetland B as meeting the definition of a Category 3 Wetland. This categorization is due to the degree to which the wetlands have been impacted through past and ongoing land use management practices which include ditching, outlet modification, and soils compaction. A Function and Value analysis of each wetland resulted in the assignment of a rating of Low to Medium for Wetland A and a rating of Low for Wetland B. The City of Renton regulates activities in and around wetland areas Such regulations require that an undisturbed native vegetation buffer be placed along the upland side of the identified wetland areas The standard City of Renton protective buffer width for a Class 3 Wetland is 25 feet as measured perpendicular to the wetland edge so 116a6w d 1 TABLE OF CONTENTS EXECUTIVESUMMARY..................................................................................................... i TABLE OF CONTENTS................................... ACKNOWLEDGMENT........................................................................................................... i INTRODUCTION.................................................................................................................... 2 WETLANDSTUDY PURPOSE.............................................................................................. 2 PROPERTY SITE DESCRIPTION .........................................................................................2 WETLANDS EVALUATION AND DELINEATION REPORT..................................................3 BACKGROUND INFORMATION ........................................................................................... 3 Review of Prior Resource Mapping........................................................................ 3 U.S. Fish and Wildlife Service .................................................................... 3 KingCounty................................................................................................. 3 Cityof Renton.............................................................................................. 3 ProjectSite Soil Types................................................................................3 ONSITEANALYSIS...............................................................................................................4 WetlandSurvey Methods ........................................................................................ 4 FieldObservations ..................................................................................................4 Vegetation....................................................................................................4 Soils............................................................................................................. 5 WETLAND DETERMINATION............................................................................................... 6 Comparison of Wetland Determinations using 1987 and 1989 Methodologies ... 7 WETLAND FUNCTION AND VALUE ASSESSMENT........................................................7 FUNCTIONAL VALUATION......................................................................................7 ONSITE WETLAND VALUATION.......................................................................................... 9 .......................................... .... ..................................4W nvuun.a LZO ......................................... ............................. APPENDIX A 1989 FIELD DATA FORMS .......................................................................... 22 APPENDIX B PLANT SPECIES LIST.................................................................................23 APPENDIX C WETLAND VALUATION FORM...................................................................25 ACKNOWLEDGMENT The wetland delineation and report has been completed by Watershed Dynamics, Inc. Prior to extensive site planning, this document should be reviewed and approved by permitting agencies. Wetland boundaries, wetland classification, proposed buffers, and conceptual mitigation should be reviewed and approved by City of Renton Environmental Review Staff. The above consultants have provided professional services that are in accordance with the degree of care and skill generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. The consultant is not responsible for design costs incurred before this document is approved by the permitting agencies. David W. Risvold Project Ecologist Watershed Dynamics, Inc. INTRODUCTION This report details the culmination of activities and onsite evaluations undertaken by WATERSHED DYNAMICS, INC, to complete a wetland evaluation and delineation on an approximately 8.5 acre parcel located northeast of the intersection of N.E. 4th Street and Duvall Avenue NE, within the City of Renton, Washington. SE 1/4, SE 1/4, SW 1/4, Section 10, Township 23N, Range 5E (Figure 1). Wetlands mean those " lands transitional between terrestrial and aquatic systems that are inundated or saturated by ground or surface water at a frequencv and duration sufficient to support and, under normal circumstances, do support, a prevalence of.vegetation typically adapted for life in saturated soil conditions." (City of Renton Wetland Management Regulations, Ordinance #4346) WETLAND STUDY PURPOSE The PURPOSE of this study was to complete a scientific inventory and evaluation of wetland areas within the project site. This report is suitable for submittal to federal, state, and local authorities for wetland boundary verification. PROPERTY SITE DESCRIPTION The Tibbott property site (Site) is comprised of four generalized topographic features (Figure 2). These features consisted of 1) a conifer dominated, generally flat, upland forest community which comprised the majority of the Site, 2) a paved area located along the southern Site boundary, 3) previously cleared areas within the northwest portion of the Site which were dominated by deciduous tree, sapling and shrub vegetation, and 4) two depressional areas located generally along the eastern Site boundary which were dominated by deciduous tree, sapling, and shrub vegetation. The dominant vegetative community onsite was a Douglas-fir (Pseudotsuga menziesii), salal (Gau/theria shallop) upland forest community. A sub-dominant community was located in two depressional areas located generally along the eastern Site boundary. Vegetation in these two areas included black cottonwood (Populus trichocarpa) trees, Oregon ash (Fraxinus latifolia) saplings, and a sparse to dense Douglas spiraea (Spiraea douglasii) shrub component. Three additional distinctive vegetative assemblages identified onsite included an ornamental tree and shrub community along a portion of the paved Site feature and deciduous dominated shrub and sapling communities (Spiraea and willow (Salix spp.)) found a) in association with the ditchline 2 Tibbott Final Wetland and Mitigation Report WetMitt.doc el - 'l-• sue' }}=fA ��t~ �R �}y�i'^- '�- I�'^Jr`�s -.�fss""''�T:7�•y"i'.�=!1"..d�6 O. _ FIR raw F-P id 1�..�.alL�(a'���t Y ter.. �_ f.•f_•- �• v�����yg.►. r� 'j{!y� _ �y, =��=tiyr+aLiz'..•r•:J-'.i�i;�..-_.__�!L� ��err .._'-=• d'•�`A.�• � _- �� r.H --�=' -ram- '4i�'..,�`�+-:Y';i,.;,•_ra`t;,,r,,.;; .' r ,: �. ... tit it !M.''t�,i 4" v '+•+-fi���"�"S4'-.ram �j� �i. r .-y t �+���. 22 IMM-Cls 'y.'tia'sl����T.,��?��' r '?°t�c'j�y�.N;�.z"'r'ryl� �^ fir.`';' •• s i ens '[•-- �.'�ti•5 ,` �5c�� .uC�:. rAL . . —� Offsite residence and access corridor 0HcftiFr� 594.02 Pr o p crty Boundary IDeciduous Piarrt Community pepressional Areas L. 1 Conifer Dominated Area u Z Access Road W aPaved Area K J J D Omemerrfei 0 Plants Ottch6ne NE 4th Street FIGURE 2. Site Features Map WATERSHED MYNA CS ism Auburn woy K SX*F (not to scale) Aw'urn WA 98002 along Duvall Avenue NE, and b) in previously cleared areas within the northwest portion of the Site. WETLANDS EVALUATION AND DELINEATION REPORT BACKGROUND INFORMATION Review of Prior Resource Mapping U.S. Fish and Wildlife Service The National Wetlands Inventory Maps for the Site vicinity were reviewed prior to onsite evaluations. No wetlands were identified within the Site using this reference source (Figure 3). King County The Sensitive Areas Map Folio was reviewed prior to onsite evaluations. This reference source did not identify any wetland areas within, or immediately adjacent to, the Site. This source identified King County Wetland #150 - Lower Cedar River, as being offsite, east of the Site (Figure 4). City of Renton The City's Wetland Inventory process has identified three wetland areas adjacent to, but not associated with, the Site (Figure 5). These wetlands are identified as W-20 (to the north), W21 K (to the south), and W27 (to the southwest). Project Site Soil Types The project site soil types as listed in the "Soil Survey of King County Area, Washington" (U.S. Department of Agriculture, Soil Conservation Service, (November 1973) (Figure 6) are: • Alderwood aravelly sandy loam - 6%-15% slopes (AqC): This soil series is moderately well drained and is found in uplands. A typical pedon of Alderwood soils is dark brown (10YR 4/3) gravelly sandy loam from 2 to 12 inches. The Alderwood series is not considered to be a Hydric soil in King County. • Everett gravelly sandy loam - 6%-15% slopes (EvB): This soil series is somewhat excessively drained and underlain by very gravelly sands at depths of 18"-36." A typical pedon of Everett soils is dark brown (7.5YR 3/4) gravelly sandy loam from 1.5 to 17 inches. The Everett series is not considered to be a Hydric soil in King County. 3 Tibbott Final Wetland and Mitigation Report WetMitt.doc t 4e••;;fit I r �, w.y • �.•�.•- � f:�iti3 '•T*'`° � fib.�,,/. � . 1 � • •I ,L 1 � _y, Ve• ` i G _.- •, .`fir � � F- �`•' U ���• i, _ �t-v � .\''-_- t 'fit 2dh •� mod. ',- � � 1��� •,�•';} _ •2�� :,`iti�.: •� � ..t' `. INA PROJECT SITE `'� �`{2{`C i.���T4• � •fir �`. t" ��•�:1��.�i Wetlands 0 Wec&mu Duwamish ^ f I Op«n 7 War n„r rII J :f WATERSHEuDur n DaYyNAMICS'fFIGURE 4. King County Wetland K swe F Inventory Auburn WA 98002 1 �I j . VV I bf\ W 1 7 K -26 v !PROJECT SITE W18K W 2 CEME } . W 21 K 1 1 1 S- 25 ' 1 L\ 1 W-48 S-21 r------ J L S-24 ------------ W30K �N-2 m W29- C I \ S-22 �S -23 :IGURE 5. City of Renton WATERSHED DYNAMICS 1833 Auburn Wcr hL Sul1� F Wetland Inventory to W;. d Ld IL to �'' `• `v :dww U) I YCL ,tEl� \ r /• c 16 .:.►`K y .................. V � !.i � + Y [ � J • �.�iY; Kam- v/ ONSITE ANALYSIS Wetland Survey Methods Specific onsite wetland evaluation for the Site centered on the onsite evaluation of the established three criteria for wetland delineation as outlined in the Federal Manual for Identifying and Delineating Jurisdictional Wetlands (1989 Manual). Completed on April 17, 1995, the objective of this evaluation was to define and delineate areas within the project site that meet the established criteria for wetland identification. The onsite delineation was performed utilizing the Vegetative Unit Sampling Procedure as defined in the Intermediate On-site Determination Method of the 1989 Manual. This procedure involves sampling plant communities along established transects to determine wetland boundaries. At established points along the transect observations were made as"to the primary plant species within the plant community. Observations of vegetation communities in those areas which were cleared were made using adjacent non-disturbed vegetative communities. Soil characteristics and indications of hydrology were also made as needed. Field data sheets are provided in Appendix A to this report. Evaluation of the Site was also completed using the Level 2 Routine Delineation Method for areas over 5 acres as specified in the 1987 Corps of Engineers Wetlands Delineation Manual. The resultant transitional boundary between wetland and non-wetland was marked in the field with numbered and flagged 4-foot wooden stakes or on flagged woody vegetation. This transitional boundary was then identified on the project site plan. FIELD OBSERVATIONS The Site was generally flat, with a very slight slope towards the south and east. A shallow depressional corridor was present in the southeast corner of the Site as well as within an area located generally along the eastern Site boundary. Onsite drainage appeared to be directed through the Site in a generally southern direction. Vegetation Site-specific investigations identified one dominant plant community and several sub- dominant plant communities within the Site. The primary plant community found throughout the majority of the site was comprised of a Doug las-fir/salal upland forest community. This assemblage is considered non-hydrophytic (i.e. non-wetland) and is 4 Tibbott Final Wetland and Mitigation Report typical of well drained upland areas in Puget Sound. A second non-hydrophytic plant community consisted of introduced landscape plants and shrubs found along and within the periphery of the Douglas-fir forest, adjacent to the paved Site feature. Several areas were identified which were dominated by plant species typically considered to be hydrophytic. One such area was located within the southwest corner, and along the western boundary, of the Site and was associated with the roadway ditch along Duvall Avenue S.E. This area contained dense stands of spiraea and Willow saplings, and also contained Scot's broom (Cytisus scoparius) and introduced erosion control seeded grasses. A second area of hydrophytic plants was located within the northwest portion of the Site. This area had been logged many years past and was dominated by decidous shrubs and saplings such as black cottonwood, willow, elderberry (Sambucus racemosa), indian plum (Oem/aria cerasiformis), and spiraea. Two other areas dominanted by deciduous vegetation were two depressional areas that were situated generally along the eastern Site boundary and within the southeast corner of the Site. These areas contained species such as black cottonwood, Oregon ash, spiraea, and slough sedge. SOILS (The location of soil test pits is included in Figure 7) Site-specific analysis identified both hydric and non-hydric soils within the project Site. Hydric soils are typically defined as soils that are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions within the upper horizons. Sample Plots (SP#) SP4, and SP10 through SP14 were located within the area dominated by hydrophytic vegetation and exhibited a soil matrix color of black to very x dark brown (10YR 2/1 - 3/2) at 10 inches - or below the A horizon. Soil texture was primarily silty loam. Yellowish brown (10YR 4/6) mottles were present in several samples. Sample Plots SP1 through SP3, SP5 through SP9, and SP15 through SP17 were observed to exhibit non-hydric soil characteristics. The soil matrix color was primarily very dark brown (10YR 3/2) to dark yellowish-brown (10YR 4/3) and had a soil texture of sandy loam to gravelly sandy loam. Redoximorphic features such as gleyed layers, mottles, and concretions, were not observed in these sample plots which exhibited the general character of the Alderwood gravelly sandy soil series. 5 Tibbott Final Wetland and Mitigation Report WetMdt.doc HYDROLOGY Wetland hydrology in the Site appeared to be provided by a seasonally high water table and stormwater runoff from higher elevation areas within, and to the north of, the Site, as well as from roadway stormwater runoff from Duvall Avenue NE and NE 4th Street. Indicators of wetland hydrology included soil mottles, soil saturation, wetland drainage patterns, sulfidic odor, and visual evidence of ponded water. The two onsite depressional areas appeared to be a vestige of a larger drainage corridor, a portion of which may historically have passed through the Site from north to south. Based upon a review of the topography of the Site vicinity, it appears that the majority of the larger drainage corridor historically bypassed the Site to the west. This remains the case at present as offsite land management, commercial, and retail development activities have resulted in the active management of area drainage patterns. Drainage which may historically have contributed to Site hydrologic support is presently directed away from the Site, towards the southwest, via culverts under Duvall Avenue NE. WETLAND DETERMINATION Based on the wetland delineation criteria established in the 1989 Manual and onsite analysis, two wetland areas were identified within the Site (Figure 7 and Attachment A - survey map). The wetlands were generally located along the Site's eastern boundary and within the southeast corner of the Site. Both areas appeared to be hydrologically supported by stormwater runoff and a seasonally high water table. The wetland areas were defined by the documentation of hydrophytic vegetation communities, hydric soils, and wetland hydrology criterion. The onsite portion of Wetland A was surveyed and found to be 0.29 acres in size (12,948 sq. ft). This wetland appeared to extend offsite to the south via a culvert under N.E. 4th Street. Wetland A was dominated by a forested plant community dominated by black cottonwood and exhibited the classification of a Palustrine, forested, seasonally flooded/saturated (PFOE) wetland following the procedures defined within Classification of Wetlands and Dee water Habitats of the United States (Cowardin et al. FWS/OBS-79/31). Wetland B was surveyed and found to be 0.23 acres in size (9,965 sq. ft). Wetland B was dominated by a scrub-shrub plant community dominated by spiraea and salmonberry. Wetland B exhibited the following classification following the procedures defined within Classification of Wetlands and Deegwater Habitats of the United States (Cowardin et al. FWS/OBS-79/31). Palustrine, scrub-shrub, seasonally flooded/saturated (PSSC)* *The upland periphery of Wetland B was vegetated by a Douglas-fir forest community but, the aerial extent of coverage of the fir trees was not considered sufficient ti.e. >-20%) to warrant the classification of Wetland B as "Forested." . 6 Tibbott Final Wetland and Mitigation Report WetMit t.doc Offsite residence and access corridor Ditchline 1 2 Property Boundary General Direction SP14 of Site Drainage WETLAND B C Depressional Areas Q 5SP130 > I SP12^T / ® SP9 O tchiine p SP18 SP8 SPA 0 SP10 SPo �l SP11 ( SP16 SP5L S,P4i WETLAND A SP17SP3 J ( 2 SP2 NE 4th Street Ditchline SP# = Sample Plot Locations FIGURE 7. WATERSHED DYNAMICS l633 Auburn Wcy R Sulfa F Conceptual Site Wetland Map AuburnwA �eooz Wetland A and B appeared to have once been part of a continuous wetland corridor (based upon their landscape position relative to each other and the offsite wetland areas) which likely extended offsite to the north and south. Based. upon our field reviews, both Wetland A and B have been substantially impacted through commercial and residential development within the Site and the surrounding basin. The commercial and residential development which has taken place on all sides of the Site has resulted in the alteration of Site (and adjacent area) hydrology, vegetative abundance and composition, and soil compaction. A large multi-phase residential development under construction to the north of the Site has resulted in the diversion of surface water towards the southwest, under Duvall Avenue NE, away from the Site. The construction of NE 4th Street along the southern boundary of the Site, and the associated ongoing maintenance of that roadway ditchline, has altered Site drainage patterns and resulted in untreated roadway storm' water runoff intrusion into Wetland A. Additionally,'past land use activities onsite (such as historic logging) have altered Site hydrology through soil compaction and alteration of native vegetation. Comparison of Wetfand Determinations using 1987 and 1989 Methodologies A comparison of the wetland determination results using the Federal Manual for Identifying and Delineating Jurisdictional Wetlands (1989) and the 1987 Corps of Engineers Wetlands Delineation Manual was completed using data collected onsite. There were no differences observed in the location of the wetland edge when delineated using these two methods. WETLAND FUNCTION AND VALUE ASSESSMENT Wetlands are known to perform significant roles in the ecosystem, some of which are of immediate value to society. These roles vary greatly with the size, type, hydrology, vegetation, and location of wetland areas. Although the functions performed by these wetlands are complex, interrelated, and difficult to assess and quantify, methods have been developed for the U.S. Army Corps of Engineers (Adamus et al. 1987: Reppert et al. 1979). Valuable functions include: hydrologic support, shoreline protection, stormwater and floodwater storage, water quality, groundwater recharge, and natural biological functions (Table 1). FUNCTIONAL VALUATION The HYDROLOGIC SUPPORT FUNCTION is defined by the measure of hydrologic stability and environmental integrity which the wetland provides. This function is measured by the frequency of inundation and saturation by tidal actions, stream flow, runoff, and precipitation. Wetlands permanently inundated 7 Tibbott Final Weiland and Mitigation Report WetMil t.doc WETLAND FUNCTION VALUE CRITERIA € LOW RATING MEDIUM RATING HIGH RATING HYDROLOGIC inlermiHenlJy flooded seasonally flooded inlerfidol or SUPPORT hydrologically isoleied or open wafer permonenlly flooded t SHORELINE wellond width < 100yds wellond widih 100-200 yd; wellond widlh 3--'200yds PROTECTION ECTION from shoreline from shoreline from shoreline emergent of tacking sparse woody cnd dense woody vegetation vegelolion dense emegent vegelolion undeveloped shoreline moderately developed highly developed shoreline shoreline STORMWATER $ FLOODWATER remote s acre in size 5 to to areas in size > to acre in size remote orecs rural areas urdan and developable STORAGE < 10% woody cover 10 - 30% woody cover areas > 30% woody cover WATER < 5 acres in size 5 - 10 acres in size > 10 acres in size QUALITY <'50% vegelolion density 50-80% vegetation e i Jermillenlly flooded > 80% vegetation density no proximity to downsireorn from density pollutants downstream from non-point pollutants point pollutants relcin.s < 25% runoff retains 25-50% runoff retains > 50% runoff GROUNDWATER RECHARGE < 5 acres in size 5 - 10 acres in size > 10 acres in size isoloted secsonoli flooded depressions y permonenlly inundated tempororily solurcled water depth 10 several feel irnpermeoble substrc!e NATURAL URAL low plant diversify moderate plant diversity high plan) diversity BIOLOGICAL lcw wildlife diversify . two habitat types three or more hebilol features locking several vegelolion hobilol types FUNCTION one vegelolion community communities large wellond size smell wellond area moderate wellond size unique habitat features, isolcled associated wilh inlermitlenf plants or animals present stream/ high soil marsh associoled with permonenl stream/ tidal marsh WETLAND ID. DATE or saturated, or intertidal wetlands are valued as high. Medium valued wetlands are seasonally flooded or are open water systems that remain saturated during most of the growing season. Wetlands that are intermittently flooded or hydrologically isolated are considered of low value. The SHORELINE PROTECTION FUNCTION is defined by the measure of shielding from wave action, erosion, or storm damage which a wetland provides. This function is measured by the location and width of the wetland along shoreline areas, types of vegetation present, and the extent of development along the shoreline. A high value is given to wetlands along a shoreline that have a width greater than 200 yards and dense woody vegetation. A medium value is given to a wetland with a width of 100 to 200 yards, sparse woody vegetation, and dense emergent vegetation. Wetlands less than 100 yards in width and emergent or lacking vegetation are considered of low value. The STORMWATER AND FLOODWATER STORAGE FUNCTION is defined by the ability of a wetland to store water and retard flow during periods of flood or storm discharge. Wetlands of larger size are generally considered to have greater ability to provide this function. In addition, wetlands nearer to urban or potentially developable areas are also considered to provide greater flood protections than wetlands which are in undeveloped areas. The WATER QUALITY FUNCTION is defined by the physical, biological, and chemical processes which wetlands provide to naturally purify water. This function removes organic and mineral particulates through natural filtration. In general, wetlands of greater size, more dense vegetation, and close to point sources of pollution are considered to be of higher value. Wetlands which are small (<5 acres), lacking dense vegetation, and not close to point or non-point sources of pollution are considered of low value. The GROUNDWATER RECHARGE FUNCTION is defined by the interaction of the underlying geology and soils, and the surface topography. This function provides for the movement of surface water into groundwater systems. Important to this function is wetland size, period of inundation, and depth of standing water within the wetland. High value is given to permanently inundated wetlands greater than 10 acres in size. Medium value is given to wetlands which are seasonally flooded and 5 to 10 acres in size. Wetlands less than 5 acres in size, isolated, and temporarily saturated are considered of lour value. The NATURAL BIOLOGICAL FUNCTION is defined by the complexity of physical habitats and biological species within the wetland area. The value given to a wetland depends upon its ability to provide habitat for nesting (spawning), incubation, feeding, rearing, and cover• of aquatic and terrestrial animal and fish species. In addition, the ability of a wetland to provide support Tibbott Final Wetland and Mitigation Report WetMitt.doc for varying food chains is an important element in value assessment. Wetlands of high species diversity, three or more habitat types, unique habitat features, large in size, and associated with a permanent stream or tidal marsh are considered of high value. Wetlands with moderate species diversity, two habitat types, moderate in size, and associated with an intermittent stream or high salt ' marsh are considered of medium value. A low value is given to wetlands of low species diversity, small size, and isolated. i These six functions are rated low, moderate, or high, based on the criteria outlined in Table 1. These criteria are guidelines compiled from Adamus (1987) and Reppert (1979) and professional judgment must be exercised in assessing these criteria. Overall values for a wetland are assigned, based on a synthesis of individual values. In addition to intrinsic functions, extrinsic functions are also recognized. These extrinsic functions provide social values that have indirect benefits to wetlands. Education and recreational opportunities are most often mentioned as extrinsic functions. Associated values are often in the eye of the beholder and are thus difficult to evaluate. As such, these functions are not rated, but are nonetheless important when considering creation, restoration, or enhancement projects. ONSITE WETLAND VALUATION The wetland area identified wit hin the Site was evaluated following the functional value assessment process noted above. The offsite portions of the wetland were also given consideration in this process, though they were unavailable for the same level of assessment as they were located on private property. An evaluation form is provided in Appendix C. As identified in the functional value assessment Wetland A would be considered to have an overall value rating of Low - Medium and Wetland B would be considered to have an overall value rating of Low. The rationale behind the overall rating of Low to Medium to Wetland A pertains to the small size of the wetland, the low to moderate diversity of plant species observed, the limited number of habitat types identified, and the temporarily flooded character of its hydrologic component. Wetland A did receive High marks as a result of 1) its location in an urban or developable area and 2) the amount of woody cover present. The rationale behind the overall rating to Wetland B of Low pertains to its hydrological isolation, the limited diversity of plant species observed, and its small size. 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'L'"`+y .tR�,;,fY� ;���a{,�•�r<:.�q.t 1r,,f'r'V/'��i'rc,.rJ �,^ �✓ #_ 1+� �;W' � �`r`iyy� i- .s \: �i ,;�"�'f�'»`�'; �F�`�!fi�l ej.S�...c,•��t.'��r,.�'vt!:;' y + '�r,�,,""�.'��aZiK`��'�;�i�+���yYT'���p�:JYa,Kt�,�,,�,'i;+'�t':t Ji�'�►�.vt`.'��. k: .�: ti :`„'.'v`'�r+Sz7��;"_.:��ti�,' r=.rM�,_+,t,��4•'�' r ,�`w�4 rh�•�ySki>.+':'•._ '�4✓•.���� :1 "�12.!s�S..;n��,1�j�t j: �+• .'1' '� t,t +�f�1�L� �'\'$t"7rs•,wi" .., ^ i:� 'i'i:�`��.• I Oi '�. if xn s�77..<�•J'�.a' •w t• ` .. •�, ` r� wi`+d+ 'rtf .,r, ii •,it�►•t.. .,1,'•t>: '."Cur +�r oit .: cL js.,f.'..+�11T' i SAMPLE PLOT SP-1 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4117/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipePresent? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 2.5Y 4/3-4/4 Mottle Colors: None Additional hydric soil indicators: Dry gravelly fill material Comments: Adjacent roadway ditchline. Appeared to be sidecast in origin HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO X Depth tb free-standing water in pit/soil probe hole? > Mark other field Indicators of surface Inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns. Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: None Comments: Percent of dominant species that are OBL,FACW and/or FAC? 0.0 Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES NO X Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Lacked mandatory technical criteria SAMPLE PLOT SP-1 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species~ Indicator Percent Cover +Mid oint�of Rank? Status Areal Cover Class Cover Class 1. 2. T 3. 4. 5. 6. 7. 8. 9. 10. 11. Shrub rub Species 13. Corylus comuta FacU 25 14.• Rubus lacianatus FacU+ 10 \ 15. Gaultheria shallon FacU 100 16. \ 17. 18. \ 19. \' 20. \ 21. \ 22. Sapling Species 23. 24. 25. \ 26. \ 27. \ 28. 29. \\ 30. \ Tree Species \ 31. 32. 33 \ 34. \Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints JDATA FORM SAMPLE PLOT SP-2 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Projecl/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott — Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) + Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES _ NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X— Gleyed? YES NO X Matrix Color. 2.5Y 4/3-4/4 Mottle Colors: none Additional hydric soil indicators: Comments: Adjacent ditchline along NE 4th Street HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 4" Mark other field indicators of surface inundation or soil saturation below. Oxidized root zones Water-stained leaves Water marks Surface scoured areas _- Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: None Percent of dominant species that are OBL,FACW and/or FAC? 5 Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory criteria. SAMPLE PLOT SP-2 SAMPLE PLOT SP-2 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigators) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Midpointl of Rank2 Status Areal Cover Class Cover Class 12. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Shrub Species 13. Spiraea douglasii FacW 20 3 20.5 1' 14. Rubus lacianatus FacU+ 10 2 10.5 2' 15. 16. 17. 18. 19. 20. 211. 22. Sapling Species 23. Populus trichocarpa Fac T 24. 25. 26. 27. 28. 29. 30. Tree Species 31. 32. 33 34. Sum of Midpoints 31 Dominance Threshold Number Equals 50% X sum of Midpoints 15.5 DATA FORM SAMPLE PLOT SP-3 - INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI-Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 _ (EvB-A C) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X— Gleyed? YES NO X Matrix Color. 7.5YR 3/3 Mottle Colors: None Additional hydric soil indicators: Saturated sandy loam Comments: HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES . X NO Depth to free-standing water in pit/soil probe hole? 4 Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-borne sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 50 Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X i Reason for jurisdictional decision: � Lacked mandatory technical criteria i SAMPLE PLOT SP-3 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDi -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species _ M Indicator Percent Cover Midpoint!of Rank2 Status Areal Cover Class,\ Cover Class 1. 2.3. \ 4. \ 5. 6. 7• \ 8. \ 90 \� 11. \ Sh \ nub Species 13. Gaultheria shallon FacU 100 14. 15. 16. \ 19. \ 20.- \ 21. \ 22. \ Sapling Species \ 23. 24. \ 25. \ 26. \ 27. Tree Species 28. Pseudotsuga FacU 30 \ menziesii 29. Tsuga heterophylla FacU- 30 \ 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,fast rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints Is Immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk DATA FORM SAMPLE PLOT SP-4 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: W_ A County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (Ev6-AqC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X' Gleyed? YES NO X Matrix Color. 10YR 3/1-2/1 Mottle Colors: None Additional hydric soil indicators: Saturated sift loam Comments: U HYDROLOGY Is the ground surface inundated? YES X NO Surface water depth: 2" Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 100 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES X NO Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES X NO Reason for Jurisdictional decision: Satisfies mandatory technical criteria DATA FORM SAMPLE PLOT Spy INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: _ King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Rank? Status Areal Cover Class Cover Class 2. 3. 4. 6. 5. \ 7. 8. \ 90 \ 11. 12. Shrub Species \ 13. Spiraea douglasii FacW 100 14. 15. 16. \ 19. \ 20.- 21. 22. Sapling Species 23. 24. 25. 26. 27. Tree Species 28. 29. 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until of the total for all species midpoints Is immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. I DATA FORM SAMPLE PLOT SP-5 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: Kind Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method od Transed# Plot# Vegetation Unit#/ Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES _ NO X Gleyed? YES NO X Matrix Color. 2.5Y 4/3-4/4 Mottle Colors: None Additional hydric soil indicators: Saturated gravelly sandy loam Comments: HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? >1 g" Mario other field indicators of surface inundation or soil saturation below. Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? >50 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES NO X Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory technical criteria SAMPLE PLOT SP-5 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Midpoint!of Rank? Status Areal Cover Class Cover Class 1. 2. 3. 4. \ 5. \ 6. \ 7. 8. \ 9. 10. 11. 12. \ Shrub Species \ 13. Spiraea douglasii FacW 30 14. Gualtheria shalion FacU 50 \ 15. \ 16. \ 19. 20. ' 21. 22. \ Sapling Species \ 23. Picea sitchensis Fac 50 24. \ 25. \ 26. \ Tree Tree Species 28. - Populus trichocarpa Fac 70 29. �. 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 F 1-5%(3.0);2-6 15%(10.5);3=16.25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6-76-95%(85.5);7-96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for aH species midpoints Is immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk SAMPLE PLOT SP-6 DATA FORM - INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: _King Applicant/owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit"ame: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-A C) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 313 Mottle Colors: None Additional hydric soil indicators: Saturated gravelly loam Comments: Very gravelly material HYDROLOGY I Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 6" Mark other field indicators of surface inundation or soil saturation below. Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 0.0 Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory technical criteria DATA FORM SAMPLE PLOT SP-6 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott -- Vegetation Unit#/Name: -- Herb Species Indicator Percent Cover Mid Ding of Rank? Status Areal Cover Class Cover Class 2. 3. ---- 4. 5. \ 6. 7. - \ 9. 10. 11. \ 12. Shrub Species 13. 14. Gualtheria shallon Fac_ U 100 \ 15. 16. \ 19. 20. \ 21. �\ 22. \ Sapling Species \ 23. 24. \ 25. 26. - \ 27. Tree Species 28. -- Pseudotsuga Fac 100 menziesii 29. \ 30 ,\ Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0)• 2. To determine the dominants,rust rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints is immediately exceeded. AS species contn'buting to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. 1 SAMPLE PLOT SP-7 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field investigator(s) WDI -Dave Risvold Date: 4/17/95 1 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: 1 SOILS J Series/Phase: Gravelly sandy loam Subgroup2 (EvB-A C) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES _ NO X Histic epipedon Present? YES NO 1 Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 2/2 Mottle Colors: None Additional hydric soil indicators: _Saturated gravelly loam Comments: Very gravelly material HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 6" Mark other field indicators of surface inundation or soil saturation below- Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Located in corridor between two areas exhibiting hydric soils May be old logging road Percent of dominant species that are OBL.FACW and/or FAC? 100.0 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for Jurisdictional decision: Failed to satisfy mandatory technical criteria-soils appeared infrequently saturated and/or well drained DATA FORM SAMPLE PLOT SP-7 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Midpoint!of ~Rank? ' Status Areal Cover Class Cover Class 1. 2. 3. 4. 5. 6. - 7. 8. - 9. \ 10. \ 11. 12. \ Shrub Species \ 13. 14. Rubus spectabilis Fac+ 25 15. 16. 19. - 20. 21. 22. Sapling Species 23. Fraxinus latifolia FacW 35 24. 25. � 26. '` 27. • Tree Species 28. 29. 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0). r 6=76-95%(85.5);7=96-100%(98.0). Z To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species unto 50%of the total for all species midpoints is immediately exceeded. All species contnbuting to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. i SAMPLE PLOT SP-8 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipePresent? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 3/2 Mottle Colors: None Additional hydric soil indicators: Saturated gravelly loam Comments: Very gravelly material HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 6" Mark other field indicators of surface inundation.or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-borne sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Located in corridor between two areas exhibiting hydric soils May be old logging road Percent of dominant species that are OBL,FACW and/or FAC? 100.0 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory technical criteria-soils appeared infrequently saturated and/or well drained SAMPLE PLOT SP-8 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave.:and 4th Street- Renton State: WA County. King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species r W^ Indicator Percent Cover Rank? Status Areal Cover Class Cover Class 12. 3. 4. 5. 6. 7. — 9. 10. 11. 12. Shrub Species 13. 14. Rubus spectabilis Fac+ 25 �_ 7-0.5' I 15. Oemlaria FacU- 10 cerasiformis �— l - S 16.- 19. 20. 21. 22. Sapling Species 23. 24. 25. 26. 27. Tree Species 28. Pseudotsuga FacU 5 menziesii 29. Populus trichocarpa Fac 50 30 Sum of Midpoints 7Z- Dominance Threshold Number Equals 50% X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=2650%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints Is immediately exceeded. All species contributing to that cumulative total(the dominance DATA FORM - SAMPLE PLOT SP-9 - INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott -- intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (Ev6-AgC) Is the soil on the hydric soils list? YES NO X Undetermined _ Is the soil a Histosol? YES NO X Histic epipedon Present? YES O Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 3/3 Mottle Colors: None Additional hydric soil indicators: Saturated gravelly loam Comments: HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 6" Mario other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks _ Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? >50 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory technical criteria-soils appeared well drained SAMPLE PLOT SP-9 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site. Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Midpoint!of Rank? Status Areal Cover Class Cover Class 1. 2. 3. 4. ■ 5. 6. 7. 8. \ 9. \ 10. \ 11. 12. Shrub Species 13. 14. Rubus spectabilis Fac+ 15 \ 15. Oemlaria FacU- T \ cerasiformis 16. Rubus procerus FacU 10 \ 20. 21. 22. Sapling Species 23. Fraxinus latifolia FacW 15 \ 24. 25. \\ 26. \ Tree Tree Species \ 28. Alnus rubra Fac 70 29. 30 1 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants.first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species unG150%of the total for all species midpoints is immediately exceeded. AD species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. DATA FORM SAMPLE PLOT SP-10 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI-Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroupz (EvB-AgC) Is the soil on the hydric soils list? YES NO _X _ Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gieyed? YES NO X Matrix Color. 10YR 3/1 Mottle Colors: None Additional hydric soil indicators: Saturated silty loam Comments: HYDROLOGY Is the ground surface Inundated? YES X NO Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? Surface j i Mark other field indicators of surface inundation or soil saturation below: i Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 100 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES X NO Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES X NO Reason for jurisdictional decision: Satisfies mandatory technical criteria DATA FORM SAMPLE PLOT SP-10 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover M9122inti of Rank? Status Areal Cover Class Cover Class 1. 2. 3. 4. - 5. \ 6. \ 7. 8. 10. 11. \ 12. \ Shrub Species 13. \ 14. Rubus spectabilis Fac+ T \ 15. Spiraea douglasii FacW T 16. 19. _ 20. 21. 22. Sapling Species 23. Fraxinus latifolia FacW 15 \ 24. 25. 26. \ 27. Tree Species 28. Populus trichocarpa Fac 100 29. 30 1 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none); 1 =1-5%(3.0);2=6.15%(10.5);3-16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species untH 50%of the total for all species midpoints is immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. J JDATA FORM SAMPLE PLOT SP-11 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method -X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES _ NO X Histic epipedon Present? YES NO is the soil mottled? YES NO X Gleyed? YES NO X ' Matrix Color. 10YR 3/1 Mottle Colors: None Additional hydric soil indicators: Saturated silty loam Comments: HYDROLOGY Is the ground surface inundated? YES X NO Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 2" Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas. Drift lines Wetland drainage pattems Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic Indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 100 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES X NO Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES X NO Reason for jurisdictional decision: Offsite Sample Point-satisfied mandatory criteria SAMPLE PLOT SP-11 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott - --- Vegetation Unit#/Name: -' Herb Species Indicator Percent Cover Mid Rank? Status Areal Cover Class Cover Class 2. 11 3. 5. 6. 7. --- - ----- 10. \ 11. 12. Shrub Species \ 13. \ 14. Rubus spectabilis Fac+ 20 15. Spiraea douglasu FacW 1-p 16. 19. 21. _ 22. -- Sanlina Species 23. Fraxinus latifolia FacW 25 \ 24. 25. \ 26. \ 27. \ Tree Species 28. Populus trichocarpa Fac 100 29. --- 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5)•7=96-100%(98.0). untilZ To determine the dominants,first rank the species by their midpoints. Then cumulativeiy sum the midpoints of the ranked species 50%of the total for all species midpoints is immediately exceeded, All species contnbuting to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk DATA FORM SAMPLE PLOT SP-12 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton I State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# _ Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X r Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 3/1 Mottle Colors: None Additional hydric soil indicators: Saturated silty loam Comments: HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? surface Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Sulfidic smell Comments: Percent of dominant species that are OBL,FACW and/or FAC? <50 Is the hydrophytic vegetation criterion met? YES X' NO Is the hydric soil criterion met? YES X NO Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES X NO Reason for jurisdictional decision: Satisfied mandatory criteria-vegetation presumed to be acting hydrophytically due to _presence of hydric soils and hydrology DATA FORM SAMPLE PLOT SP-12 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator ~Percent Cover Mid ointi of Ran ? Status Areal Cover Class Cover Class 1. Ranunculus repens FacW- 10 2 10.5 1• 2. Polystichum munitum FacU 15 2 10.5 1' 3. Athyrium felix-femina Fac+ 5 1 3.0 2 4. 5. 6. 7. 8. 10• 11. 12. Shrub Species 13. 1 . 15. 16. 19. ' 20. - 21. 22. _ Sapling Species 23. Rhamnus pursiana Fac- 25 3 20.5 1` 24. 25. 26. 27. Tree Species i 28. - Pseudotsuga FacU 25 3 20.5 1' menziesii 29. 30 Sum of Midpoints 65 Dominance Threshold Number Equals 50%X sum of Midpoints 32.5 1. cover classes(midpoints):T<t%(none);1 -1-5%(3.0);2-6-15%(10.5);3-16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints Is Immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. 1 JDATA FORM SAMPLE PLOT SP-13 INTERMEDIATE-LEVEL ONS TE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: ' Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination _Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS _ Series/Phase: Gravelly sandy loam Subgroup2 _ (EvB-Aoq Is the soil on the hydric soils list? YES NO X Is the soil a Histosol? YES Undetermined NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO Matrix Color. 10YR 3/2 X Mottle Colors: None Additional hydric soil indicators: Saturated sandy gravelly loam Comments: Is the ground surface inundated? YES HYDROLOGY NO X Surface water depth: Is the soil saturated? YES X NO ----- Depth to free-standing water in pit/soil probe hole? 3" Mark other field indicators of surface inundation or soil saturation below. Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-borne sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FACT Is the hydrophytic vegetation criterion met? YES <50 Is the hydric soil criterion met? NO X YES NO X Is the wetland hydrology criterion met? YES X NO is the vegetation unit or plot wetland? YES NO X Reason for Jurisdictional decision: Failed to satisfy mandatory criteria SAMPLE PLOT SP-13 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 ProjecUSite: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Ownec Dean Tibbott Vegetation Unit#/Name: Herb Species _ Indicator Percent Cover Mid oint.1 of Ran 2 Status Areal Cover Class Cover Class 2. 3. 4. 5. 6. 7. 8. 9. 10. 111. 12. Shrub Species 13. Gaultheria shallon FacU 70 14. Acer circinatum Fac- 100 15. Corylus comuta FacU 10 16. 19. 21. 22. Saplina Species 23. 24. 25. 26. 27. Tree Species 28. 29. 30 Sum of Midpoints 65 Dominance Threshold Number Equals 50% X sum of Midpoints 32.5 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0):2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5)•7=96-100%(98.0). 2. To determine the dominants.first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints is Immediately exceeded. All species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk i i DATA FORM SAMPLE PLOT SP-14 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 J Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# _ Plot# Vegetation Unit#/Name Sample#within Veg. Unit: J SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) ' Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X ' Matrix Color. 10YR 3/3 Mottle Colors: None Additional hydric soil indicators: Saturated sandy gravelly loam ' Comments: ' HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? 12" Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Comments: Percent of dominant species that are OBL,FACW and/or FAC? 50 Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory criteria SAMPLE PLOT SP-14 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4117/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species r Indicator Percent Cover Mid oint1 of Ranks Status Areal Cover Class Cover Class 1. Trillium ovatum UPL T 0.0 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Shrub Species 13. Gaultheria shallon FacU 50 4 38.0 2' 14. Rubus spectabilis Fac+ 100 7 98.0 1` 1 . 16. 19. 20. 21. 22. Sapling Species 23. 24. 25. 26. 27. Tree Species 28. 29. 30 Sum of Midpoints 136 Dominance Threshold Number Equals 50%X sum of Midpoints 68 1. Cover classes(midpoints):T<1%(none);T-1-5%(3.0);2-&15%(10.5);3 a 16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=7&95%(115.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints is immediately exceeded. An species contnbuting to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk DATA FORM SAMPLE PLOT SP-15 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: King Applicant/Owner Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES _ NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 2.5Y 3/3 Mottle Colors: None Additional hydric soil indicators: Saturated sandy gravelly loam Comments: Located adjacent to road corridor- offsite to north HYDROLOGY Is the ground surface inundated? YES X . NO Surface water depth: Is the soil saturated? YES X NO Depth to free-standing water in pit/soil probe hole? surface Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic indicators: Percent of dominant species that are OBL,FACW and/or FAC? 0.0• Is the hydrophytic vegetation criterion met? YES NO X Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory criteria-vegetation had been cleared as a result of roadway construction. Soils appeared well drained. SAMPLE PLOT SP-15 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species _ Indicator Percent Cover r Midpoint!of Ran ? Status Areal Cover Class Cover Class 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Shrub Species 13. 14. 16. 15. 19. 20. 21. 22. Saplin4 Species 23. Sorbus sitchensis UPI 10 24. 25. 26. 27. - Tree Species 28. 29. 30 Sum of Midpoints Dominance Threshold Number Equals 50% X sum of Midpoints - 1. Cover classes(midpoints):T<1%(none);1 =1-5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2 To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints is immediately exceeded. All species contnbuting to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk. i DATA FORM SAMPLE PLOT SP-16 INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street-Renton State: WA County: _King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO X Gleyed? YES NO X Matrix Color. 10YR 3/3 Mottle Colors: None Additional hydric soil indicators: Saturated sandy gravelly loam Comments: Located in roadway ditchline area adjacent to Duvall Avenue. Extremely compact soils HYDROLOGY Is the ground surface inundated? YES X NO Surface water depth: Is the soil saturated? YES X NO bepih to free-standing water in pit/soil probe hole? surface Mark other field Indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-bome sedimental deposits Morphological plant adaptations Additional hydrologic Indicators: Percent of dominant species that are OBL,FACW and/or FAC? 100 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES NO X Is the wetland hydrology criterion met? YES X NO Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory criteria. Site appeared to be constructed ditchline which has not had vegetation maintenance recently and which ponds water as a result of the compact nature of the soils. SAMPLE PLOT SP-16 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Midpointl of Rank? Status Areal Cover Class Cover Class 1. ._--- 2. 3. 4. �— 6. 7. ----- 8. 9. 10. 11. 12. Shrub Species 13. Spiraea douglasii FacW 100 14. 15. 16. - 19. 20. 21. 22. Sapling Species 23. Populus trichocarpa Fac 30 24. 25. 27. Tree Species 28. 29. 30 Sum of Midpoints Dominance Threshold Number Equals 50%X sum of Midpoints 1. Cover classes(midpoints):T<1%(none);1 -1-5%(3.0);2-6-15%(10.5);3-16-25%(20.5);4 t 26-50%(38.0);5--51-75%(63.0); 6-76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for an species midpoints is immediately exceeded. AN species contnWing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk SAMPLE PLOT SP-17 DATA FORM INTERMEDIATE'-LEVEL ONSITE DETERMINATION METHOD OR COMPREHENSIVE ONSITE DETERMINATION METHOD (Soils and Hydrology) Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Intermediate-level Onsite Method X Comprehensive Onsite Determination Method Transect# Plot# Vegetation Unit#/Name: Sample#within Veg. Unit: SOILS Series/Phase: Gravelly sandy loam Subgroup2 (EvB-AgC) Is the soil on the hydric soils list? YES NO X Undetermined Is the soil a Histosol? YES NO X Histic epipedon Present? YES NO Is the soil mottled? YES NO Gleyed? YES NO' X Matrix Color. 10YR 3/2 Mottle Colors: 10YR 4/6 Additional hydric soil indicators: Comments: Located in roadway ditchline area adjacent to Duvall Avenue Extremely compact soils HYDROLOGY Is the ground surface inundated? YES NO X Surface water depth: Is the soil saturated? YES NO X Depth to free-standing water in pit/soil probe hole? Mark other field indicators of surface inundation or soil saturation below: Oxidized root zones Water-stained leaves Water marks Surface scoured areas Drift lines Wetland drainage patterns Water-home sedimental deposits Morphological plant adaptations Additional hydrologic indicators: None Percent of dominant species that are OBL.FACW and/or FAC? 100 Is the hydrophytic vegetation criterion met? YES X NO Is the hydric soil criterion met? YES X NO Is the wetland hydrology criterion met? YES NO X Is the vegetation unit or plot wetland? YES NO X Reason for jurisdictional decision: Failed to satisfy mandatory criteria. Site appeared to be constructed ditchline which has not had vegetation maintenance recently. There were no indicators of current hydrologic support. SAMPLE PLOT SP-17 DATA FORM INTERMEDIATE-LEVEL ONSITE DETERMINATION METHOD VEGETATION UNIT SAMPLING PROCEDURE Field Investigator(s) WDI -Dave Risvold Date: 4/17/95 Project/Site: Duvall Ave. and 4th Street- Renton State: WA County: King Applicant/Owner. Dean Tibbott Vegetation Unit#/Name: Herb Species Indicator Percent Cover Mid ointi of�Rank2 Status Areal Cover Class Cover Class 1. Dactyis glomerata FacU 20 3 20.5 1 2. 3. 4. 5. 6. 7. 8. 9. 10. 12. Shrub Species 13. Spiraea douglasii FacW 100 7 98.0 1' 14. Rubus procerus FacU T 0.0 15. Cytisus scoparius FacU 5 1 3.0 2 16. _ 19. 20. 21. 22. Sapling Species 23. Populus trichocarpa Fac 30 4 38.0 1' 24. Salix sitchensis FacW 15 2 10.5 2 25. 26. ; 27 Tree Species 28. a 29. 30 Sum of Midpoints 170 Dominance Threshold Number Equals 50% X sum of Midpoints 85 1. Cover classes(midpoints):T<1%(none);1 =1.5%(3.0);2=6-15%(10.5);3=16-25%(20.5);4=26-50%(38.0);5=51-75%(63.0); 6=76-95%(85.5);7=96-100%(98.0). 2. To determine the dominants,first rank the species by their midpoints. Then cumulatively sum the midpoints of the ranked species until 50%of the total for all species midpoints is Immediately exceeded. Ali species contributing to that cumulative total(the dominance threshold number)plus any additional species having 20%of the total midpoint value should be considered dominants and marked with an asterisk .. r •... < ..a.•.t'aF}::,?yfw?" 'Girl• :X:• `�b S.�i•�A'r� - r,: v ,��,. ry,�'a• ri.:y:•Y, fr�lr;;•7}!ea•Y;S:'r:i:a jrr,ra*„ i!:r<'u �Y� •=..ttiQV,r ..•y 5 tfi� ''� K; .Isy 'rJ"K":1 s ti,Ir15 k.•,. trJF , ' t itka �. ...' ti•, rr ,.`-ii All rrli".,•_.;J,, •ti.. ;?:� if' :•G?'- ti,i�•t:••"'i. ew;'rr'. •.:3 ri ,�7r }�f'r ✓• 1,, w. a• 'h""n` �'•i:L . +~ .�r• y-Y a ;w.•t '1S r s *3� �I� i y � I Va�': .�, i• ,. r.�L S ► .;. a Z"., {;'"' >,.r �i"} -{t l:�Yp 'G-i f!•r�! J+i;:7 , • WIN fir. Lfi 4 Jw d,:�r, a ai .,: s ;r r��t; i•' �. ''f..i y {s•l'y{l�.si ?is•:7"w`'y +1 Y C.. 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L :r contains 1993 supplement Common Name Scientific Name Indicator TREE/SAPLING STRATA Douglas fir Pseudotsuga menziesii FACU Western red cedar Thuja plicata FAC Western hemlock Tsuga heterophylla FACU big leaf maple Acermacrophyllum FACU red alder Anus rubra FAC black cottonwood Populus trichocarpa FAC cascara Rhamnus purshiana FAC willow Salix spp. FAC or wetter WOODY VINE/SHRUB STRATA Oregon grape Berberis nervosa UPL hazelnut Corylus comuta FACU salal Gaultheria shallon FACU Indian plum Oemleria cerasiformis FACU evergreen blackberry Rubus laciniatus _7 FACU- Himalayan blackberry Rubus procerai' FACU salmonberry Rubus spectabilis FAC+ Pacific red elderberry Sambucus racemosa FACU HERB STRATA slough sedge Carex obnupta OBL softrush Juncus effusus FACW common lady fern Athyrium filix-femina FAC common sword fem Polystichum munitum FACU big-leaf avens Geum macarophyllum FACW- piggy-back plant Tolmiea menziesii FAC stinging nettle Urtica dioica FAC+ "'Indicator status as defined according to the National Wetland Inventory- Wetland Plant List Obligate (OBL): Plants that are always found in wetlands under natural conditions (frequency greater than 99 percent). These plants may live in nonwetlands if planted and maintained. Facultative Wetland (FACW): Plants that are usually found in wetlands (67 to 99 percent frequency) and may occasionally be found in nonwetlands. Facultative (FAC): Plants that are sometimes found in wetlands (34 to 66 percent), but also occur in nonwetlands. Facultative Upland (FACU): Plants that are occasionally found in wetlands (1 to 33 percent frequency) and usually occur in nonwetlands. Nonwetland (UPL): Plants that occur in wetlands of another region, but are not found (less than 1 percent frequency) in wetlands in the region specified. A positive (+) sign following the indicator means that particular plant species has a tendency towards the higher end of the indicator category (more frequently found in wetlands), a negative (-) sign means a tendency towards the lower end of the indicator category(less frequently found is wetlands). 24 Tibbott Final Wetland and Mitigation Report WetMit l.doc ?? r•' ' .'G < ':il a• r:4.�...y<� K •y t .'Cl w y !3 w.a:; v: �.r �r „! "' „� , +,r:,,'�!.: fr'• `l'/;i "+�, ,yF:a� Y• ,`,..t,t �h,� ,V!},it $ ••I,w �t?p •! z,� a '�1.7, ?,.-.3^�.a',�.�.+.t:�!i 1.1..r� + ;v >-d 1 t i• +•,-. ,:, ,:r .{•r". - '.., 1''�•,t.!�.OIN�. ) u ' Z •k;,xf -'r(,/� U'yht.f� �M�i..1 "'+iL.,.. �: Ins �3,,�1. r�.r••�' T/ �+T ,p.1'f+. Jt!'r.c.:..•w� .} a 7 •,., :s V9 „' -_7 -`r r vl}. y.0..,.,t1 W' r� F i.t:.;1.7 >�'`• '"+ 1Pr!t.' + k-•, �. f ; ..f�,.y. �:ti .t r ]MC• , ':r`I': '• ::�:�}'ray.!'�,F,?4'+ t•,. '- '•.pfdl�S'."5. .,��e:X,�"wy1�n�+ii,ri�yS+.,�'�.� .r.. 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FUNCTION o '����e�1�:✓� LOW RATINGS IiEDIUM RATING HIGH RATING HYDROLOGIC inlcrmitlenlly floode �seesonell� r Y flooded intertidal or SUPPORT hydroioyicelly isoleled or open water permoncnlly flooded SHORELINE w•ellon d width < 100yts wetland width 100-200 yds xellend x•;dlh >'20Oyds PROTECTION fro:a shoreline from shcreline from shoreline erergent or lacking sparse wood di dense woody vegelelion veselelic� m ns-e eesenl vegctolion ljJ undeveloped shor moderately developed highly developed shoreline / ` shoreline STORMWATER < 5 cc.-es in size 5 10 10 ocres in size > 10 ocres in size FLOODWATER -rcmc e areas rural areas u on cn�evelopeble STORAGE < 10% woody cover 10 - 30`/. woody cover areas > 30`. woody cover �'v'ATER < ccres in size 5 - 10 acres in size > 10 ocres ;n size QUALITY Y 50/. vegelotian density 50-'e0`/. ciclian S > 80`/. vesciclion raer._Cn11y flooded densit denslly no prcx,.mity ►o ownstreorn from downslreo ,ram po11c!cnss non- , pailulenis point pollulcnJs relc;ns < 25'/. runof retains 25-50% runoff relcins > 50% runoff GROUNDWATER < 5�e�T i, S;zo s - fo acres ;, size > to acres i, size RECHARGE isc,a•e ' secsonelly flooded Permanently inundated depressions (� wolcr depth to several feel temporarily saturated i-Y:r, .ec5le subsrrote NATURAL low plenf diversity, nodcrote picni d;versily high plcnl diversi!y �1wo abilat ! es BIOLOGICAL 4— +v;ldlife diversity . y. )'? IN cc or more .Sift! 'eclures IccY.ingL severo eselolion habitat types FUNCTION ION o.r_ vegefclion community eommuni!ies serge wellend size smoll w•eltond area moderate ++•ellcnd size unique hobitcl (eclures, ;s ;c• ed associated A.i!h inlermitlen1 plonk or er.imels present essocioled with permanent slreom/ high salt marsh sireom/ !idol marsh `'dETLAIIND 1D. DATE WETLAND VALUE CRITERIA • FUNCTION LOW RATING MEDIUM RATING HIGH RATING HYDROLOGIC in!erm;lfenlly floode' )seesonolly flooded infcrlidcl or SUPPORThyd:clogiee;ly 'solcled or opeh wo!er permanently flcodcd SHORELINE �A `el;end width < 100yes wellcnd width 100-200 yds wellond width > 200yds I „om shoreline ram shoreline PROTECTION cr. cr enl el lacY.in from soh .r_oline—� S g sparse woody c,,d -d , sc woody vegetation vcgelel;on dense em�Sca{-� qe elion undeveloped shot — cro ely developed h;ghly developed shoreline shoreline STORNIMA T ER 8 Cccres in Size 5 to 10 acres in size > 10 acres in Size FLOOM'VATER r crew rurcl crew urdcn and developable STORAGE < 10% woody cover to - 30% N oody cover trees > 30`/. woody cover `fVATER < 5 acres in size 5 - 10 acres in size 10 acres in size QUALITY c 0% vegetation eensily 0-50/ vegeiclion > 50`/. vegetation infermillently flooded y dcnslly na proximity to downstream from dcwn streom from �etl;;tent non-po;nl pollulanis point pollulenls reIcin s •/ runof! retains 25-50% runoff rc!c;ns > 50% runoff GROUNDWATER < 5 acres in size 5 - 10 acres s; RECHARGE !•�'l ;e 10 acres in size > �scti .ed secsoncily flooded pe,mcnently inundated .cr press;ors v•ofcr depth to severet 1ce1 lemporeri!y sotureled i•mpermeob!e subsltc!c NATURAL URAL few plenl diversify moderate p!cnl divers;!y hieh plenl diver<_ily low wildlife diversify • lwo hobilct lypes three or more BIOLOGICAL hcbilcl features locking several vegefetion hob;iol types FUNCTION tea,-, vegelotion tom uni!y communities. lcrge wellond size all •eHand area moderate wellond size unique habitat features, iso,ele associated with inlermitlenl Plants or animals present slreom/ h;gh soil morsh ossocioled with permanent sircom/ 1;dol marsh WETLAND ID. ' —7—/—43uf DATE VII. BASIN AND COMMUNITY PLAN AREAS frry T�. NO SN .on ow 'j4�. � • rill Loki VAN, WFI, low TT FA 11r gap �rr"�1" �i► � tea. �.�M :. _ • . • • t �� .1 t, f a r,'�vt ¢ }-a1�'��.w�_A��t���+S�t � c ��•:�h °5T �a Ji' .Y�.s.'�ri.�`l��i�.�� it _, .. ."t��•� �PA11►�w_t' �'�i�i 1./° x^.•et `r r\ raa i�J 1 `Y Ssw ,+i '#.I `,�,, .,y V,i Cull j%v �. mow '��a♦wI p 7Vu :!pm �s�, Vo \ : p.Yf',° .MS.. .l f\ w hrj li.1i,�� � ,��Js♦ �I Ai^'' +d 11X` .�,t1.- r►"T Y-Dl: °°qry n,"1 � jC' fir! 8sI1�.IK.t*,"t 4y, r� -�'��'>, {pfJ�JSi n- r a,/,f g ��* RCI+a jyy}y'r 4 1 haw 'jg Mr Red ��N (5� Ir7yS,�`i✓��l carry 0.�. .s`Sn'rMYlnf•N I�..r t t1! a. .. I� tr a acL�ru-�anr sr,L.Y1f>t�f� Lans' �ds.'"Y.'T Jgg�r�'� ..J? t c. ►,��js- Z !_�•;,'''��75']e s'►n�sa'1 �..�%��+, .,•.;�°a ,ar.°.�.R+���fv��i� AN � �, � Nf�,{;?,j 7.w�t f' ,..� �� ��� ° , {.�.k �t ^fir r•� na �rr r �t,: 9^Z'!;� �\� W��+�► l�1'?'iwli Vl �la h;a��r�s�.•'43 vi�'�N1 ti9° �+�+"'�' l�fri , ,�///���1� Oki 4� � ���,�"�� ��� ! ��h, l w� CAS �Ws,��k•--.�+' � 'Y Y ..�,�. ;��Gy r 1 1 � • J � � f ,I r G � 1 T i Y f o I . s VIII. OTHER PERMITS IX. EROSION/SEDIMENTATION CONTROL DESIGN tW4ls1o.) GIN s7?�u Affiol ) U521�r— kf"Z Sw t)/i2 fc:a z vo,t W W W W W Wxxx N O O AO' � .-� /G Q, 76 CP'S !se'P� /$ i v 3� � �► Z �Y1�v tZiv ) eirr M tV fV (zo 2 PmAe s /620 �� Po � QA- M TI'4"C� 4 $LV v/2zr 1/15/98 4:53 : 17 pm Barghausen Engineers page 1 QFC\WALGREENS - RENTON, WA STORM DRAINAGE DETENTION CALCULATIONS BCE # 6116 BASIN SUMMARY BASIN ID: TESC NAME: 02YR/24HR EROSION CONTROL SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7.43 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPEIA PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 7 .43 Acres 0.00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 82 . 00 0.00 TC. . . . . 10. 00 min 0. 00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 300. 00 ns: 0.4000 p2yr: 2 . 00 s: 0. 0060 TcReach - Shallow L: 80. 00 ks:5. 00 s: 0. 0060 PEAK RATE: 0.76 cfs VOL: 0.40 Ac-ft TIME: 480 min X. ADDITIONAL DOCUMENTS XI. 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ST. e/• �s C oog S a °I0 ab i 7*6 s3.� ►2 y v ti ti 05 \ o���n ���ZO oS2D os4�' \ ,5° \ �o 0 3 2 N. I I Q 15 73-AT- �� 0 7.N B - c�3�9 \' � 1yy, 2 n1 I I rL 0 6¢ 630 I�Z Ga O -5� k�p ` ��0 p I o0q 30 IZ I A i o' �e 7e y4 /g a 37 37 74 S3.sN `3 � 1 I G o/• 7.f- P o/�0 3 0 30 IV 9A- ?-9-i2 H" - G71, '¢7' I S E:, 13 6 TH ST o 0 - _- - `- 1326 15 �Go. ��c N 88° 2�1' ! ^�' W <So y 1, ,9re ) n SE 136 TH ST ,°� , X is 73 83r. i.r Scir•v. •�._. ��O Win_� 13 2 6• i 4 FYO. 606 o� •ems 981�+ E 15- 23 -- 5 sci.n X/!76 98 4. .S2 Scirr I✓ETL/�Ul�: /t/ca/ Y/71.3 ?7.00 • � hJ Nam.• .S�c rc.r�rs-cycc� .f/f_='O` o. �%J. .l'/� .37- /v 3 j e /cco oDow HIGHLAND MARKET PLACE L0 W Covt= m or-itt D iE;� A ^�- z �' Cn A ' PORTION ION O THE S.E. 1/4 O S.W..W. �/4, �7y I Q � Q � w rr�� �p� SECTION 10, TOWNSHIP 23 N., RANGE 5 ., Y�'.M. 0 25 50 100 � � Z RENTON, WASHINGTON i � T � 0 NE UH ST I t I f�� �' ` � � �v� f F-: CCC NE 4TH SE 128TH ST REENWO CEMETERY � - w � � g Q SITE `10597.90' i3 07 12"W w W 0 — - - - - - - - - - - - - - - - - - - - - - z 1 .� F� ¢.<. r .XS xxa ,;.tea r✓-_ ,- y, k 1 ��$ 3 .�,._.�...:,. LL_l � � 0 5 y:Y k s :.. - ::: z,. ,.,; v'S z ,�.: 6 h-,sz: ..:_, .:--.,s �_.<._.''`•"%'y`.,< '; '. r - �o-��,xt.::�� r'a'�'�3L�'rs z, .4. a : u Y . ti 1 s \\ VICINITY MAR 0 w Z) NO SCALE i v -- 0 - ;;` I SHEET INDEX: 0 , os- as A 1. C*YM SHEET I PfE11_14,INARY GRADM AKO STORM DRAINAGE PLAN ; \ ! 3. PfF ..IMMIARY SAPITARY SFWER AND WAT>=RMAtN PLAN j�..�.. 4 PiE.iMINAfY Now AD DETAO �C ANCHOR L LANDSCAE R PLAN 5 to 3 ._3 LEGAL D SCRIF 1ON: `41 THE SOUTHEAST QUARTER OF THE SOUTHEAST QUARTER OF THE 4 I O SOUTHWEST QUARTER OF SECTION 10, TOWNSHIP 23 NORTH, -- �- —- - RANGE 5 EAST, W.M., IN KING COUNTY, WASHINGTON; 1 ? EXCEPT THOSE PORTION THEROF LYING WITHIN S.E. 128TH ST. I AND 138TH AVENUE S.E. 13 F 0 I i — '' + - ---FIT - ------ �T j VEFMCAL DATUM- CITY� � CITY OF RENTON I I BENCHMARK j F Y s BRASS CAP AT INTERSECTION 0"" NE 4TH (128TH S.E) W i I _ AND 140TH SE EL EV- I ''v z°'ns �yJz '''m -•'` '�f' r�ll I / 'j f�iy'.... I I —tl 398.5491' I _ 0Al x BABB - I --- / SOUTH LINE OF THE SW 1 4 CF SEC. 10, TWN. 23N. RNG. 6E, W.M. - -- — — — — — — — — — — — — N 88' 02' 58" W - KCAS uj CONTRACTOR SHALL BE FULLY RESPONSISLE FOR OBTAINING PERMITS FROM THE 0 LJ WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES FOR REMOVING AND ®" \ - N REPLACING ALL SURVEY MONUMENTATI(,-g MAT MAY BE AFFECTED BY CONSTRUCTION ACTIVITY, PURSUANT TO WAC 332-12Ca- APPLICATIONS MUST 8E COMPLETED BY A b REGISTERED LAND SURVEYOR. A,PFLIC-� t ,`S FOR PERMITS Tti REMOVE MONUMENTS Z = - J - 0 r <� MAY BE OBTAINED FROM THE WASHIivv. •r< ETA?� DEPARTMENT OF NATURAL z I t ( RESO ROES, OR BY CONTACTING THEIR OFFICE BY TELEPHONE AT (206) 902-1190. uj WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES _ _ PUBLIC LAND SURVEY OFFICE - U i� 1111 WASHINGTON STREET S.E. 14- -41, \L/ P.O. BOAC 47060 + + + +++++ ++ + OLYMPIA, WASHINGTON 98504-7060 _ _ -- _-- + + + + + + + + + + t + I UPON COMPLETION OF CONSTRUCTION ALL MONUMENTS DISPLACED REMOVED. OR + + ^-+ + + + + + + + + DESTROYED SHALL BE REPLACED BY A REGISTERED LAND SURVEYOR, AT THE COST AND + + + + + + + + + + AT THE DIRECTION OF THE CONTRACTOR, PURSUANT TO THESE REGULATIONS, THE + + + + + + + + + + + + � APPROPRIATE FORMS FOR REPLACEMENT OF SAID MONUMENTATION SHALL ALSO BE THE to + + + + + + + + + + + ++++++++t++ + + + + - - -= - - - - - - RESPONSIBILITY OF HE CONTRACTOR, + + + + + + + + - + + + + + w � � � �I/ '0e + + + + + + + + + + - — — — — Z w ++++++++++++t++++ y Ji \ V V I � + + + + + y � � � I I w d Q +++++t++++++++++++ I I _ X a z -- IIETAI + + + + + + + + + / UT1LlTY CONFLICT NOTE L, N z Li . . . . . . . . CAUTION- 00 + + + THE CONTRACTOR SHALL BE RESPON;IBLE FOR VERIFYING THE LOCATION, DIMENSION, AND DEPTH Q 00 N I` ? +++++++ `t++ �I. y OF ALL EYISTING U11L1T1ES W}iETIiER SHOWN ON THESE PLANS OR NOT BY POTHOLING THE Z 0 w ++++++++++++ UTILITIES AND SURVEYING THE HORIZONTAL AND VERTICAL LOCATION PRIOR TO CONSTRUCTION. N Q y, y, -4/ THIS SHALL INCLUDE CALLING UTILITY LOCATE 0 1-800-424-5555 AND THEN POTHOLINGLo C9 v + + + ALL OF THE EXISTING UTILff1ES AT LOCATIONS OF NEW UTILITY CROSSINGS TO PHYSICALLY Cy N Lo ,1, J, y, �, �� VERIFY WHETHER OR NOT CONFLICTS EXIST. LOCATIONS OF SAID UTILITIES AS SHOWN ON THESE `> n + + t + RE CO CD ®� . �.. + PIIVJS ARE BASED UPON THE Ui�lVERiF1ED PUBLIC INFORMATION AND ARE SUBJECT TO VARIATION. R v �.QO — -_ _ _ _ — r I IF CONFLICTS SHOULD OCCUR, THE CONTRACTOR SHALL CONSULT BARGHAUSEN O00 W 0 Cyn" > ne L = 3.t31 s — — — _ — - X +++++++ `� '� CONSULTING ENGINEERS, INC. TO RE�JLVE ALL PROBLEMS PRIOR TO PROCEEDING WITH — v rn —_ CONSTRUCTION. K. S s WA bpo CALL BEFORE YOU DI -- - C' h T. (S.E. 1 th .� — — — — ___ i — - -- 1-800-4 4-5555 � Lu - ---- 2 672 ., �1 -- - --- -- -- -- -- — — — — — — — �SSFo/ST01NG�� I gJv DNA L ——------ EXPIRES CITY OR RENTON _ t° IDEPARTMENT OF PUBLIC W0IFICF<B''` T`r DEVELOPMENT PLANNIN11 z CITY OF RITNTON o _ DES}C�tFED 0 DATE 6/26/97 FILE NO, � DRAWN MTS -- CHECKED DKB SCALE I"= 50' FEW BOOK _PAGE_ uj CIO. REVISION AFFR. DATE APPROVED OIRECiOR OF PUBLIC WORKS SHEET OF 4 (�d File: P:\SDSKPRO,2\6115\ENGINEERING\6116P01.DWG Date/Time: 11/20/1997 08:25 Scale: 1=50 MarkS Xrefs: Z6116-PT,Z6116-PB,Z6116-PA,Z6116PS1, f/ Existing SDM„y ' Fj I f/ R1.Eim==3 49G8G0 322( , - M NARY GR ING AND ST M DRAINAGE PLAN 18 - u A POR110N OF SECTION 10, ` WP. 23N., RGE 5E., W.M. Existin SDMh' 0%1 SD-7 �j !�54 % =39359 8 ? .1.=394.2-9398, -5 Q$ (i2'SN)CONNECT Existirt�CB // ----- --- -----.i-- ------ - - - A i �� /N CB 'I REMOVE EX'•. 12". SD 1 WIRE FENCE COR. I 1 =40 E.= 93.85 (36W,... /, _NEN CB -NEW CB I �1.56'W, 1.86'N OF Exist;? CB _ I IE 194.74I t 4 - IE=396.07 IE=395+81 ExShed 0 20 40 80 W0 2"W OP. CORNER Rim= 98.73 �\ NEW CB ,< 597.90 I . , ...,. R E=393,93 t36 :sZ ,,T / „ .�".. 29 LF 18" S @ 0.20,a I I 1�=396.35 SD - - - - - - - - - - - - - - - - - - - - - - - - IIJ 130 LF 12 - ,F _ _ _ -- ,WAL _ C � n.zo� 0 98 1 %_. p v (IN 399.02:1 396.0 55 LF " SD 398.9 „ -r r' " .`- w " 39E:Q,_ - -- \ _- _ I I 110 L F 12 S ID 0 c: o� _-� 1 1.4 " r r r FOU REBAR & CAP \ �" I I 1_a i 2% �� / N '�f. FCR FiIAIN 1,011 391.0 \ PJEYJ t B r_ _. _. :, - _ -=- LS 13909 ! ( YP) o _ 396.Q ( 1 7W, .12'N \ III NEW B ° L-. _ 3�f3 4 -IE=395.0 :1 / \ s, �-- NEW CO -. I I I IE=3 00 I /- n A �" -STORM DRAINAGE PUMP SYSTEM s° ., / �` 391. / \ / L 2 I 2'-6' HIGH z ! o -. WALL 01=0 ANCHOR2.1 I �� �- �� - 4 HIGH R INING � , \ / _j ANCHOR 2 Lo ,�- rn I I 00S.F. � ry� � � �o aLo ":R.DRAINAGE DETENTIONAET POND � X NEW ��.52 �. L� 10 IL- I - - - � \ BOTTOM TJVET-PONDEL=391.0- 400�? - `BG OM DETENTION POND-EL=395.0 3 1.0 MAX EL=398.0 I I - I 2:1 l m 3 - 1 MIN. TQPI POND=399.0 I� ! IC395.0 3 I ( 4t I IE 3^ 61 \\ 35 LF 18"-- -�'a 399.5 391.0 I - - LEGEND: � I I I � \ • >,, , Vim.: - 1 tI ',.,. ., e t v,�.� _. _ -. PROPOSED T`(PE II CATCH BASIN 2:1 • �n STRUC�URE 391.0 ( I / _ _ 399.4 -- Tory I PROPOSED TYPE I CATCH BASIN o 399.3 99. ITJ Ia. 4 of - - -1 ,r IE=39k.93 �\ O r 399.Q (T`rP % � fir/j' t /� I � ¢ 2:1 - -, - H 3991 �. I EXISTING TYPE II CATCH BASIN 128 LF 12 SD @ 0.247. ! ---- _ 0a - NEW CB Exrstm S - � ,CF � i , �,._i�, 1 ��,. - IE=396 4 I l� °r e �1.0 _ 69 'LF 15" ;U t?.24 `�' I RETAINING WALL I I Ew GB I g 1.O,o9,6 1.0 a� i .0 1,3% -- 13z LF P' SGY'"t7.2'4; . _-. _ _ f l 3 �,0 j -, _.. _.._. ,� ..__ _ .. � - ._ .._ a __� f =� \ EXISTING TYPE I CATCH BASIN ❑ =39 .0 G__1 39J3.0 r! e o r3°,, fG \ 3 9 a 98 SEE T -ICAL ROAD � a ' < LQ � -=----- 3:::: 399.5 39 .5 _f PROPOSED STORM DRAINAGE LINE , SE(,(IONS ON SHEE r r _ _.�. . / �' - - (- 9E3.8 1�lF�x 'GB: .% ,-' ;= .'' I � I I �/ - F� 4-121 L 3 Or 4 I I I _ _ 1. 5 7!' r SD Ca? 0. 2% I _a 'I 399,E 33�J:Oa M1 r9.0 r1-1 It 13,E 6._/- r\ ------- - q EXISTING STORM DRAINAGE LINE - - -- - ----- - - - ;. F / 1 39fa-24 cn /� u� I00 z PROPOSED SANITARY SOWER MANHOLE 127 Fri r- c: �, 3w 1 ` 25 MI - { I 9.9 40[1. $9.9 399.E 399.9 ?) #00.0 39_� v9.9 _Q' w I + : ,�•- - ,. � - EXISTING SANITARY SEWER MANHOLE Q R --- - .. '� �i Ew c� h £ `.. cn � � I ,- 'RIDGE :%<' '�i� NEW c� III =39 .4 399 I1I - ! � -" I A W/SOCK LID �, C° M - _ - WETLAND BUFFER I PROPOSED SANITARY SEWER LINE _...._..-__...___---_...... IE-394. 6 �. ,�- rJ Z � 3J -=i �. I L.L r l EXISTING SANIGARY SEWER LINE -- - I l r >� � 00 Ic_30�2 - i N CB > EXISTING WATERMAIN ----------------------- `LI 1 := 97- 3 - NEW C_•Q IFfi � 6 6 PROPOSED WATERMAIN - ---------__--- ___ -- �� 9 .4 , 399�d ! 39.4 399.4 '399,4 399.4 3§9.4 EXISTING TRAFFIC SIGNAL BOX ® ' z I ( 0,8-7� -_T. 9 15 399.5 4- I i C14 U) EDGE OF RELOCATED WETLANDS Ri 1.33� " 12$ LF 8 SD ® 0Fri .20% 13 i LF 12" SD �! 0.24 'r - E5 LF 12S' D 1 a \ 399. r..-. / r w._ a a9 7 � -0.247.._ xs�F3:9 , p rn �400.0 4QQ,Q 0 Ja EDGE OF EXISTING WETLANDS -- 399,4 399.1 - r 3945 .- FI ,+ + + + \+ + + + + _ Fri RIDGE RIDGE ,' RIDGE ca ')U�aE + + ++ ++ + ++ + + + EDG EXISTINSWETLAND' 4 gg + + + + E I Q �� ( I E=3,C.88 399.8 399.88 399,8 fi" v,sou 399. 399 �a? r 399. ++ ++ + +++ + + + ++ + + + + + + + + l �lr (n EXISTING DITCH - - " - - w �° A° _`5 + + � �3$ I � �" EXISTING CONTOURS I � � - I �- ++ + + + i ++ ++++++ + + + ++ + + + H{H+1H HH}44H .� ti.. M I _ -I, LF 8' SD iE_._39' 35 F a -, i. � �a -396 -- rrt O U> 3994 I I _E 3983 + NEW!- CB + + + + � + + � � o i 0.2�t a 339.7 y � . _._LL_. - - + + + + + + + I I \ s r 2' + + + + + + y PROPOSED SPOT ELEVATION 399.2 O L-= _1 _ NEA! CB E ' ............................................. r I ( NEW GB /' __-_ EW CB -- = :_I ___- _ • '. Fa n /'�� ; SOW+ FLaOW+D[SCHt�RC E + �!/ -I"00POSED ESE �/ RIDGE LINE N t I ( t�Ew C I I' ; IEI fJ +�� + + I z ATE-397.5 99;2V' 399.2 \ �-« f + + + + + + + OF RELOCATED WETLAND I / �' c r` - ` I � � + + + + + + + + EDGELn - i I - if +++ + F + +++ + + ++++ + + NEW ASPHALT I-- Existr;n SSb4 I t 2% ° + I -^� � 2 ; I 1 I - g9. a 1 6. + + Oil + Df + + + +++ i �17 m I �' 399.U + !! Exist. s �- -- - ------ I 7 _- _ ' 99.3 Found + IE=394.27+ + + + + \ _ -PROPOWD I P. I 40Q.1 L() 9. NF�'J-GE3 I� �` / 25' + + + + + + + R � 1 * % I EW C3 � tf?� I I ,gg 3� '� t i \ 1�r \� : � � -- + + + + + + + � � D I -3975 rl �, !'.I,lielf �3u0 * -- ° WETLAND ++ + ++++ + + + ®} 3 ����C o� S 1 E L N - I _ - '�. PUGET F )`;ER i rp + + ANP rt �r Q Z I a�` 4)0.5 00. .. L I MEP T ; ` ; n�r ,_ BUFFER +++ + ++ ++ � �� . EASE O e `, RECORDI IG p U 33`1 99 399.5 / I t,i .� I ' + + + L� 88'05 4 --- _ < R 35.00 3 39 Oi _._ - �\ N + + ++ + _-Q\4 _- __ - 1 __I CLEAR Jr -' + + + 1 L = 3.81 E E T r + 1 + + 672 ' f + + SET REBR AP". .2 F - _ WATER 8" ---- W -- ---- - --- Y - �_ --N€W-r- C8 - -- ----- 1.E.-393 64 ------ r IE=397.0 Rim= 6- E*-FfRAFFI-, STGr>JAL-- - _ ------ Fo ----------------- - -- ----- °rA1E _C j ----------------- - --- - - _ ,• EXPIRES - l.E.-395. 1E-3955 - t91 t� 12-SD - ---- ------ S . „ 15o LF 12" SD - o _ - - - - - -- - -- --------'-=---- - ---------- ---- - -- - ----- -------------------- CITY OF RENTON 8 02 58 -®-T,0 D SLOPE, CONSTRUCTION, UTILI Y E.ASEMENT NEW CB _ - _ I - E -TRAFF+E S l-_ 0.83% �69--EF 7.8_S6� Q�47. W --L--DQ 2585.68 _ �, RELIIRDttd rya 871Oa�o - __- - - - IE=393.98 CONK (. T0= T� �-��-- -__ T _ -- - C�FPAR_FM�RI-F �� PUE3t_Ic \A f - - _ - - - - - -- - - -- - - - - _- _- � - EX CB � Rim=39722 _ _r_ _ LE.=39._3.52 (18"N,W,E) - 24 S`ee1 lid � �,. � �� � --- ---- � - f� --7-E Location Approximate'- _ . - - - _ - - --- ---- FOUND SURFACE MONUMENT f/ _ -- �. -- _ SEE-Tf PtC'AL GOAD---- - - --� _____ _ - - S____1�4 COP.. SECT. 10 _II _ Ex SOMH SECTIONS ON SHEET _- - 4-17-95 fl m=�97.5�- - -- --- - DESIc�vED 40F4 - _ LE.= Full of Water - -- - - DATE 6 26/97 FILE Nc --._-____ -• � OI�ERFLOW=395.37 (18'S) pRAyy�.� MTS - CHECKED DKB SCALE 1"= 40' RELD I NO. - REVIS!^, APFR. DATE AFPROYED Y,.,... , ®... ,-. .� :>. .,. w�=. :_ .-..,., _ ... .t _R ., .,..> , . ,., A. ..,, -,,,g =,, . _ -. :" . .. ,, ,..,<.• . „a ...,. . . >R., • ,. , -,. ,. .._., - -_ . . -x>,,,,.., _, ., „- _. >a,. -,_sc . ,.z ,,m.r:ma.. , .,....w, .. ,. -,,..,... :.,.n,.. ... .,. .:,,.o :.. .cs. :a.... . ,»ximr. * mmr:., ,n„-v ,., .=.: ,y.: .: .`asg .•, .. n. ,,,.: .a-> ., .s.:•,,.- J DIRECTOR OF PUBLIC-WORKS SHEET File: P-\SDSKFI;uJ',bI ;6\ENGINEERING\6116PGM2.DWG Date/Time: 11/20/1997 08:25 Scale: 1=40 MorkS Xrefs: Z6116-PT,Z6116-PB,Z6116PS1,Z6116-PA, a ,11(-) f .I`/ wr""RELIMINARY SANITARY SEWER AND WATERLINE EXTENSION PLAN w i 1I INIL, I,t 0 N L)ME N I IN C SI, /'/ . I ].:-_95 M iI d ` Rirn=4z'Itj.S2 A RM � F 1 i ' 10, T � . ., RGIE ., W.M. 65: : "I i1 /.E:=393 72 (1,97vt FrOUND 1 1/4" 4L_ CAP-\ ; 11 i. .,=39602 (Ie,,-a..F,) S'.?RFAC;: MOH, C ST. 3 ; w 4-1-17-95 J� i 11 . . t g rSL# }CT y}.'F P H ()(( 11 :. 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II .; s. }„ - ' - � 1 _ - 25' 4 va xE HYDRANT I + + + + + + + P (_ b yIETtANp + + + + + + + �i i, ( < , sl :. > BUFFER + + + + + + 1 u, II ` i ham: I, - ; I + + + + + + W ;. a (I tj4E.Tf:fL ANY` .' f'��Gf=T ! �t " - - - + + + i I -I I I as i ' GEa Llh E ; ' EASEME t3 '' WINTER METER AND -`.__ _ + + + J� �V \Y �L C� ER I ' , " �,'' a I i RECORDI I i Y t - + + + 25672 , ` II ® 88°05 4 SERVICE LINE 1 e � \Y � �"' a _. :- 2 -'` + + } F /s T ELF ��' 4$0-- I) R •=-I 35.00� 'LL ���, � : . _ . _ m ..- - - - -- -- - - - - - - � , I` ;w I ' [ I '�J�NA l E�� ,� oe��'J + + + _ ) I' `'-..,'C; .. _.>'-�,:1.�.--Jr...,:aws±m,a>, .. +, 1 )I,. --� m t m. . r. }z.._ ++,�+}+ + W 4 �,. i nI -•-•-.I-.r _ Q 3 L I E C a _ z r SE r RE A3 R & ,Air' d C. +� ,\ _ .. . _.v - .; llIlIll� 562. i. t + + + EXPIRES F*O(.:INr) MONUMI=.NT IN �`,A'"iAl of I „� - ��y I ,�F f <- Y _ .....,, EX m _ ..w:v- _ - --- -- - WATER --=--- _ - � ter. e < , :I�E �- SECTION , 1 W ----- ------------ R 8 G.I. _ - -� 7a, k e CC T�. � C,TI.)N t -------- - , - --- u_- z.. _.__...._ - � ----- - ----- ------ ----- - ___-1. -(- - - -- < :_: 1 .- .. CI�T�Y OF RENTON - 3 r YlS�tf3 G$ a _n s _- - _ EX IIIRE - ---- - - -- __ . _ __ Rini=3 6' -- - --- " _..- �� _._�- �V�--�� �,-_ --------- ----- X y �z3 HYDRRANT DEPARTMENT CIF PUBLIC WURKS 1. r� 'E=3Q�z�` -- - -- --- `� - - _-__. - - -ylc----E-- WATER R8 _C_I.--- --- - - �-- _ _ �"� -- G 1� , 8F*02r� •> - - - to -SLOPE, CONSTRUCTION, UTILITY EASEMENT 8� -- - - _ - ___ _ �--T�-�-__----------- � I --- qr - �\ ,--, - RE Dtt ?1�D - CONNECT TO EX I ____.fit - E - _ _ -=W-----I- , :-- 1 c- <:' °�._ _ - �� - - - CON BRINE. ____ FOUND SURF-At,E f�t�fNUMIWI�I I�1 - -- - - � _ DEVt�.r� ...-... �,riVNIN� 0 i- �_ ( - -- �,__1/4 COR. SECT. 10 r�Frfg3 T 2 I CITY OFRENTON '"' II _ -__ - cl- t EX;st/r r /F.. N.E. �1- - - -} - - - i - __ - - �►� - - 4 1'- s°� - - - - - - - - co - II Loc Lion peo - .- --- ----_ - -- -- - - __- • - 128th - - - - '�- __ � - �7E� / - _ /.ctccaticrr: .��`,�ra�F;%ra�r�t�- e� ("� _ DESMED `✓_.. - ._,._-- - -- - -_ --- _- - -- - - FX. SVII�°/1------.••-_------\ _11 - - DRAWN MTS DATE 6/26/97 FLE NO. II - __ -- - -7`?"r,r=a:3�S.:_2_ � - - W l F = F%1 ca/ water \ CHECKED DKB �q� 1 40' F1Et_D 800K PACE_ I-----_-- - - - (( �� _M I. ------- ------- ---- - ----------_ �kE`RFL0W ••395,37 (J8"S;.t __1� V .__ NO. REVISION BY APPR. DATE APPf�OVED . I L__ I r __. ____ ____ - ___ DIRECTOR OF PUBLIC WORKS OF m F*,le, P;',,3[l 011\5116\ENC-INEERING\6116PSW2.DWG Date/Time; 11/.20/1997 07;56 SQo1e; 1�40 Mark$ Xrefs; Z6116-PT,Z61I6-PB,Z6116-PA,Z6116PS1, NOTES AND DETAILS w _j 0) 50' R/W TO CENTERLINE w 12' LANE 11' LANE 11' LANE 10' RT 7'f 5' nw TURN LANE PLANTER WALK WATER LMLITY - GENERAL NOTES 0 w co 1. ALL, WCnK AND MATER'AALS SHALL BF IN COMPLETE ACCORDANCE WITH CURRE14T 25. IT SHALL BE T14E CONTRACTOR'S RESPONSIBILITY TO NOTIFY THE TELEPHONE COMPANY, 1. ALL WORK MATERIALS SHALL BE IN CONFORMANCE U41TII THE STANDARDS AND CITY OF RE14TON STANDARDS, CHAPTER 70 OF THE UNIFORM THE GAS COMPANY, TITS POWER COMPANY, AND THE CABLE TV COMPANY PRIOR TO SPECIFICATION$ OF THE CITY OF RENTON UTILITY DEPARTMENT AND THE LATEST EDITION 2% N 2% "' 'DOPE TEST EDITION AND WSDOT APWA CURRENT SPECIFICATIONS, AS � � .. OF HE WSDOT APWA STANDARDS AND SPECIFICATIONS AS APPROVED Y THE CITY 0 CiUld_UING r.JC_ LA __.. ._ --- ____._.._- - _,._ ., - _. - ^ - 6" ( ), / C01d.�iRUCI10N SO THAT THESE OTHER UTILITIES CAN SCHEDULE WORK ON THEIR T � O B { F - - --- ----- - ----- -- =-- -- -- ,�ENDIED BY THE CRY OF RENTON, RESPECTIVE UTILITIES. IT SHALL BE THE CONTRACTOR'S RESPONSIBILITY TO RENTON. A SET OF APPROVED PLANS SHALL BE KEPT ON SITE AT ALL TIMES DURING �___ Y --� COORDINATE THESE ACTIVITIES DURING CONSTRUCTION, CONSTRUCTION. 5" THICK CONC. 2. TI-IE CONTRACTOR SHALL OBTAIN AND HAVE AVAILABLE COPIES OF THE APPLICABLE EXISTING PAVMENT SIDEWALK w 2, Ti�iE HOURS OF WORK IN THE STREET RIGHT-OF-WAY SHALL 11E LIMITED TO 8:30 AM TO GOVERNING AGENCY STANDARDS AT THE JOB SITE DURING THE RELATED 26. CONTRACTOR 'TO DIRECT ALL YARD DRAINAGE INTO PRIVATE ROAD AREAS, AND/OR 3:30 PM ON WEEKDAYS UNLESS OTHERWISE APPROVED IN WRITING BY THE DEPARTMENT 72'L EXISTING PAVEMENT EX 8" WATER-0 EXISTING �' CONSTRUCTION OPERATIONS. ALL APPLICABLE PERMITS SHALL BE OBTAINED PRIOR TO PRIVATE CATCH BASINS. OF PUBLIC WORKS AT 235-2635.E ALL STREET" CLOSURES; PARTIAL OR FULL, SHALL BE DITCH ANY CONSTRUCTION ACTIVITY. APPROVED BY THE DEPARTMENT OF PUBLIC WORKS 24 HOURS IN ADVANCE, TTIE POLICE PROPOSED CATCH BASIN -NEW CURB ANU W 27. SEE SITE PLAN FOR DETAILED INFORMATION AND DIMENSIONS RELATED TO CURB DEPARTMENT, FIRE DEPARTMENT`, AND 911 SHALL BE NOT`LFIEU 24 HOURS IN ADVANCE. GUTTER `" '"> "�' 3. THE CONTRACTOR SHALL RE RESPONSIBLE' FOR VERIFYING THE LOCATION, DIMENSIONS, RETURNS, SIDEWALKS, PLANTER DIMENSIONS, SETBACKS, PAVEMENT EDGE LOCATIONS, TYPICAL ROAD SECTION 13- AND DEPTH OF ALL EXISTING UTILITIES PRIOR TO C01°JSTTTUCTION WHETHER SHOWN! ON EIC 3. ALL LOCATIONS OF EXISTING UTILITIES SHOWN ARE APPROXIMATE AND IT SHALL BE THE 'THESE PLANS OR NOT. LOCATIONS OF SAID UTILITIES AS SHOWN ON THESE PLANS ARE CONTRACTORS RESPONSIBILITY TO VERITY THE TRUE AND CC".RREGT LOCATION SO AS N.E. 4TH ...(. E. 128TH T.) TO AVOID DAMAGE OR DISTURBANCE. FOR UTILITY LOCATE, CALL 48-HOUR LOCATORS, t'. ! +I 1 BASED UPON THE BEST RECORDS AVAILABLE AND ARE SUBJECT TO A DEGREE OF 28. ALL. SIDE SLOPES SHOWN ON THESE PLANS SHALL BE 2.5:1 (MAXIMUM), UNLESS 1-800-424-5555. --- --------- .. _jUNKNOWN VARIATION. IF CONFLICTS SHOULD OCCUR, THE CONTRACTOR SHALL OTHERWISE SPECIFIED. SCALE 1"=10' " ` CONSULT BARGHAUSEN CONSULTING ENGINEERS, INC., TO RESOLVE ANY PROBLEMS 4. ALL WATER MAINS AND SERVICES SHALL. BE PRESSURE TESTED TO A MINIMUM OF 200 • PRIOR TO PROCEEDING WITH CONSTRUCTION. 29. THE OWNER RESERVES THE RIGHT TO HAVE ALL GRADING OPERATIONS, EXCAVATION, PSI OR 150 PSI OVER OPERATING PRESSURE, IN ACCORDANCE WITH THE SPECIFICATIONS 0 OF THE CITY OF RENTON AND THE WASHINGTON STATE HEALTH DEPARTMENT. AI-L , FILL_, COMPACTION, TRENCHING AND BACKFILL INSPECTED AND °TESTED BY AQUALIFIED PRESSURE TESTING SHALL BE DONE IN THE PRESENCE OF A REPRESENTATIVE OF THE CITY 4. IT SHALL BE THE CONTRACTOR'S RESPONSIBILITY TO NOTIFY '[HE APPROPRIATE UTILITIES REGISTERED SOILS ENGINEER. THE CONTRACTOR SHALL SCHEDULE AND COOPERATE OF RENTON. INVOIVED PRIOR TO CONSTRUCTION. WITH THE SOILS ENGINEER WHEN TESTS, INSPECTIONS, AND APPROVALS ARE DEEMED 0 5. A.LL. 0 WATER MAINS AND SERVICES SHALL BE DISINFECTED BY THE INJECTION OF A 50 PPM NECESSARY BY THE OWNER AND/OR CITY TO ASSURE COMPLIANCE WITH THE 5. TWO (2) COPIES OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER ESTABLISHED RECOMMENDATIONS. (MINIMUM CONCENTRATION) CHLORINE/WATER SOLUTION, DRY CALCIUM HYPOCHLORITE CONSTRUCTION IS 1, SHALL NOT BE PLACED IN THE PIPE AS LAID. CHLORINE SHALL BE METERED INJECTED IN `� ui �1T PROGRESS• ONE (1) SET SHALL BE SUBMITTED 'TO BARGHAUSEN / z _ AT RECORDS OF AS-BUILT IN E.I°=INFERS, INC., WITH ACCORDANCE WITH SECTION 7-11.3(12)E OR 7-11.3(12)F OF THE STANDARD .3 30. PRIOR 'TO THE START OF GRADING, ALL EXISTING VEGETATION, DEBRIS, RUBBLE, SPECIFICATIONS REFERENCED IN 1 ABOVE. 100' R/W _jCONSULTING COMPLETION OF PROJECT. TREES, AND ROOT SYSTEMS SFIALL BE REMOVED FROM THE SITE � w Cr TO THE SATISFACTION OF THE BUILDING OFFICIAL AND/OR SOILS ENGINEER, 6. A PRECONSTRUCTION CONFERENCE IS REQUIRED PRIOR TO A.NJY CONSTRUCTION, A n z w 6. INSPECTION WILL BE ACPOMPLISIIED BY A REPRESENTATIVE OF THE CITY. IT MINIMUM OF 3 (THREE) WORKING DAYS NOTICE IS REQUIRED FOR SCHEDULING. PRIOR 0 _j _, 0 STTAI_L BE THE CONTRACTOR'S RESPONSIBILITY TO NOTIFY THE FIELD INSPECTION � MU SCHEEDUL.IPNG ITHE TO CONFERENCE, A PERMIT INFORMATION SHEET a � j Cr SECTION 24 HOURS IN ADVANCE OF BACKFILLING AIJ_ CONSTRUCTION. ' a _ SUPPLIED T THE UTILITY ENGINEER'S OFFICE. T�,�NTY FOUR HOUR NOTICE WILL BE REQUIRED PRIOR TO STARTING NEW CONSTRUCTION. 0 n TO ANY CONSTRUCTION DEVELOPMENT ACTIVITY THE CITY INSPECTION BEFORE f ` .! TION DEVELOPMENT ACTIVITY OCCURS, A PRFCONST U TION 4' 11' LAME 1?' LANE 12` LANE 11' LANE 11' LANE 5' ANT10' 5; "7 PRIOR / , 1. 8..,. ORE ANY C.INS.RJC J 0R D ,�L T AC I C R C 7. R SHALL BE THE COP�fIRACTOR S RESPONSIBILITY TO SECURE ALL NECESSARY PERMITS �hfLDI� BIKE _ PLANTER ~WALK MUST BE CONTACTED FOR A PRE-CONSTRUCTION MEETING. MEETING MUST BE FIELD WITH THE CITY OF RENTON DEPARTMENT OF PUBLIC WORKS, PRIOR TO STARTING CONSTRUCHON. LANE DESIGN ENGINEER, w 8. INSTALLATION OF CORPORATE STOPS, WATER SERVICES, LINES AND METERS SHALL NOT z r 2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH T'HE "1988 STANDARD BE DONE UNTIL ALL SERVICE AGREEMENTS, METER APPLICATIONS, CONSTRUCTION � B. IlE CONTRACTOR SHALL BE RESPONSIBLE FOR PROTECTION OF ALL EXISTING UTILITIES SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL CONSTRUCTION PREPARED BY PERMITS AND PAYMENT OF FEES HAVE BEEN MADE TO THE CITY OF RENTON. o NEW CURB AND TO REMAIN IN USE WITHIN THE CONSTRUCIION AREA WHETHER SHOWN OR NOT SHOWN! WSDOT AND THE AMERICAN PUBLIC WORKS ASSOCIATIONS (APWA), AS AMENDED BY X GUTTER ui ON THE PLANS. THE CITY OF RENTON DEPARTMENT OF PUBLIC WORKS. 9. ALL CONNECTION 'TO EXISTING MAINS TO BE ACCOMPLISHED BY THE CITY OF RENTON, d EXCEPT WET TAPS WHICH MAY BE MADE BY APPROVED WET TAP CONTRACTORS WITH -- - - 2 -- ^ - - - - -- =2 _2% F AND PLUGGED WITH 3. THE STORM DRAINAGE SYSTEM SHALL BE CONSTRUCTED ACCORDING TO THE APPROVED PRIOR APPROVAL FROM THE DEPARTMENT OF PUBLIC WORKS. ALL NECESSARY - --- - -- - - ---- - - _ _ 9. ABANDONED UTILITY LINES LOCATED ON SHE SHALL B._ REMOVED PLANS WHICH ARE ON FILE IN THE DEPARTMENT OF PUBLIC WORKS, ANY DEVIATION CONCRETE AT PROPERTY LINES. EXCAVATION AND MATERIALS TO BE SUPPLIED BY THE CONTRACTOR AND BE ON-BYTE �. =��-� ,,�� FROH THE APPROVED PLANS WILL REQUIRE WRITTEN APPROVAL FROM THE CITY OF PRIOR TO CITY NOTIFICATIONS. � � 0 5" THICK CONC. , RENTON DEPARTMENT OF PUBLIC WORKS, DESIGN ENGINEER OR STORM WATT R UTILITY. EXISTING PAVMENT SIDEWALK 10. UTILITY LINES MAY NOT BE COVERED UNTIL AFTER THEY HAVE BEEN TESTED AND10. INSPECTION WILL BE ACCOMPLISHED BY A REPRESENTATIVE OF THE CITY OF RENTON. APPROVED BY OWNER AND GOVERNING AGENCY, UPON COMPLETION OF THE BACKFILL 4. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER 631 EXISTING PAVEMENT IT SHALL. BE THE CONTRACTORS RESPONSIBILITY TO NOTIFY �tIE UTILITY DEPARTP,IENT EXISTING vi tu OPERATIONS, THE UTILITY IJ14ES SHALL BE RETESTED. CONSTRUCTION IS IN PROGRESS. 24 HOURS IN ADVANCE OF PACKFILLING ALL CONSTRUCTION. THE CONTRACTOR AS DITCH 5. DATUM SHALL BE U.S.G.S UNLESS OTHERWISE APPROVED BY CITY OF RENTON WELL AS 114E ENGINEERS SHALL KEEP AS-BUILT DRAWINGS. `TYPICAL ROAD SECTION - PROPOSED CATCH BASIN 11. ALL UTILITY LINE EXCAVATION BEDDING AND BACKFILL MATERIALS, AND COMPACTION DEPARTMENT OF PUBLIC WORKS. REFERENCE BENCHMARK AND ELEVATION ARE NOTED 11. ALL ON SITE WATER SERVICE SHALL BE COPPER TUBING CONFO MIN(, T ASTM B-88 TYPE " " TYPICAL fl.d '�.w 1'�./1� R CI ( K }, SHALL BE PERFORMED IN ACCORDANCE WITH THE GOVERNING AGENCY REQUIREMENTS. ON THE PLANS. ANNEALED. 1I1E TUBING SHALL BE CCkUPI.Fr USING FLARE TYPE COMPRESSION F1TT11TGS DUVALLAV . N. . - ('138TF I AVE. S.E.) UTILITY LINES INCLUDE STORM DRAIN, WATER, SEWER, ELECTRICAL, TELEPHONE, GAS, CONFORMING TO AWWA C800 (150 PSI WORKING PRESSURE). � AND LANDSCAPE IRRIGATION LINES. 6. ALL. SEDIMENTATION/EROSION FACILITIES MUST BE IN OPERATION PRIOR TO CLEARING SCALE 1"=10' Q AND BUILDING CONSTRUCTION, AND THEY MUST BE SATISFACTORILY MAINTAINED UNTIL _ 12. ALL NEW ON-SITE ASPHALT PAVEMENT SHALL CONSIST OF: CONSTRUCTION IS COMPLETED AND THE POTENTIAL FOR ON-SITE EROSION HAS PASSED. SANITARY SEWER NOTES AND SPECi FICA► n - 3" MIN. COMPACTED DEPTH CLASS "B" ASPHALT CONCRETE, OVER 7. ALL RETENTION/DETENTION FACILITIES FAUST BE INSTALLED AND IN OPERATION PRIOR TO 1. ALL WORK MATERIALS SHALL BE IN CONFORMANCE WITH THE. STANDARDS AND { ) OR IN CONJUNCTION 4d#TH ALL CONSTRUCTION ACTIVITY UNLESS OTHERWISE APPROVED SPECIFICATIONS OF THE CITY OF REPITON UTILITY DEPARTI~II'NT AND TT{E LATEST EDITION z . - 4" (MIN.) CRUSHED ROCK BASE COMPACTED TO 95% OF MAXIMUM DENSITY PER BY THE DEPARTMENT OF PUBLIC WORKS, STORM WATER UTILITY. OF THE W,�DOT/APWA STANDARDS AND SPECIFICATIONS. f ASTM D-1557, OVER - 12" STRUCTURAL FILL (OR RECOMMENDED SUBGRADE) COMPACTED TO 95% OF 8. GRASS SEED MAY EF APPLIED BY ITYDROSEEDING. TFIE GRASS SEED MIXTURE, OTHER 2. THE HOURS OF WORK IN THE STREET RIGHT-OF-WAY SHALL. BE LIMITED TO 8:30 A.M. TO MAXIMUM DENSITY PER AS1M D-1557. THAN CITY OF RENTON APPROVED STANDARD MIXES, SHALL BE SUBMITTED BY A 3:30 P.M. ON WEEKDAYS UNLESS OTHERWISE APPROVED IN WRITING BY THE LANDSCAPE ARCHITE.CT AND APPROVED BY 'THE DEPARTMENT OF PUBLIC WORKS, STORM DEPARTMENT OF PUBLIC WORKS AT 235--2620. ALL SIRE r CLOSURES, PARTIAL OR FULL, 3. ALL NEW ON-SITE CONCItE1E PAVEMENT SHALL CONSIST OF: WATER UTILITY. SHALL BE APPROVED BY THE DEPARTMENT OF PUBLIC "1 !.S 24 HOURS IN ADVANCE. �,i 9. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION THE POLICE DEPARTMENT, FIRE DEPARTMENT AND 911 SFiaL;_ BE NOTIFIED 24 HOURS IN EROSION CONTROL NOTES - ADVANCE. 6" (MIN.) PORTLAND CEMENT" (4,000 PSI) WITH 6" X 6" - #10/#10 WELDED WIRE IN ACCORDANCE WITH SECTION 7-02.3(1) OF THE CURRENT STATE OF WASHINGTON MESH, OVER STANDARD SPECIFICATION FOR ROAD AND BRIDGE CONSTRUCTION. THIS SHALL INCLUDE 3. ALL CONSTRUCTION SHALL BE IN ACCORDA14CE WITH "STANDARD SPECIFICATIONS FOR 1. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A " II H E COURSE COMPACTED TO 95% OF MA'CIMUUM NECESSARY LEVELING OF THE TRENCH BOTTOM OR THE TOP OF THE FOUNDATION MUNICIPAL PUBLIC WORKS CONSTRUCTION" PREPARED BY WASHINGTON STATE CHAPTER PRE-CCaNJSTRUCTION MEETING MUST BE HELD WITH THE CITY OF RENTON DEPARTMENT S (MIN.) CRUSHED ROCK BASE C0 E C MP MATERIAL AS WELL AS PLACEMENT AND COMPACTION OF REQUIRED BEDDING MATERIAL DENSITY PER ASTM D-155,' OVER HE PIPE WILL BE SUPPORTED ON STANDARD SPECIFICATIONS.AMERICAN PUBLIC WORKS ASSOCIATION, LATEST EDITION (APWA) AND CITY OF' RENTON OF PUBLIC WORKS, DESIGN ENGINEER. ' TO UNIFORM GRADE: SO THAT THE ENTIRE LENGTH OF T - 12" (MIN.) STRUCTURAL FILL COMPACTED TO 95% OF MAXIMUM DENSITY PER A UNIFORMLY DENSE UNYIELDING BASE. ALL PIPE BEDDING SHALL BE APWA CLASS "C," 2. ALL LIMITS OF CLEARING AND AREAS OF VEGETATION PRESERVATION AS PRESCRIBED ON ASTM D-1557, OVER WITH TTIE EXCEPTION OF PVC PIPE. ALL TRENCH BACKFILL SHALL BE COMPACTED 'TO 4. ALL LOCATIONS OF EXISTING UTILITIES SHOWN ARE APPROXIMATE AND IT SHALL BE THE THE PLAN SHALL BE CLEARLY FLAGGED IN THE FIELD AND OBSERVED DURING _j STRUCTURAL.. FILL COMPACTED TO 90% OF" MAXIMUM DENSITY PER MINIMUM 95 PERCENT FOR PAVEMENT AND STRUCTURAL FILL AND 90 PERCENT CONTRACTOR'S RESPONSIBILITY TO VERIFY THE TRUE AND CORRECT LOCATION SO AS CONSTRUCTION. F„_ ASRA D-155' OTHERWISE PER ASTM D-1557-70. PEA GRAVEL BEDDING SHALL BE 6 INCHES AND OVER TO AVOID DAMAGE OR DISTURBANCE. AND UNDER PVC PIPE. 3. ALL REQUIRED SEDIMENTATION/EROSION CONTROL FACILITIES MUST BE CONSTRUCTED n 5. A PRECONSTRUCTION CONFERENCE AND A 24-HOUR NOTICE SHALL_ BE REQUIRED PRIOR AND IN OPERATION PRIOR TO LAND CLEARING AND/OR OTHER CONSTRUCTION TO INSURE i 4. A TACK COAT SHALL BE APPLIED AGAIPJST ALL CONCRETE EDGES TO WHICH ASPHALT IS TO , O 10, GALVANIZED STEEL PIPE A11D ALUMINIZED STEEL PIPE FOR ALL DRAINAGE FACILITIES TO STARTING NEW CONSTRUCTION. IT SHALL BE THE CONTRACTOR'S RESPONSIBILITY THAT SEDIMENT LADEN WATER DOES NOT ENTER THE NATURAL DRAINAGE SYSTEM. ALL _Ld BE PLACED. SHALL HAVE ASPHALT TREATMENT #1 OR BETTER INSIDE AND OUTSIDE. TO SECURE A.LL NECESSARY PERMITS PRIOR TO STARTING CONSTFt1GTfON. O(1NSPFCTION EROSION AND SEDIMENT FACILITIES SHALL_ BE MAINTAINED IN A SATISFACTORY CONDITION UNTIL SUCH TIME THAT CLEARING AND/OR CONSTRUCTION IS COMPLETED WILL BE ACCOMPLISHED BY A REPRESENTATIVE OF THE CITY OF RENTON). IT SHALL BE AND / z 15. SOIL STERILIZATION WEED KILLER SHALL_ BE APPLIED IN AREAS TO BE PAVED. KEEP 2 11. STRUCTURES .HALL NOT BE PERMITTED WITHIN 10 FEET OF THE SPRING LINE OF ANY A J F A.1_ POTENTIAL FOR ON-SITE EROSION HAS PASSED. THE IMPLEMENTATION, w ( ) THE CONTR .CTOR'S RESPONSIBILITY TO NOTIFY TFIE UTILITY DEPARTMENT 24 HOURS IN 0 (2 FEET) MINIMUM CLEAR OF EXISTING AND PROPOSED LANDSCAPE AREAS. APPLY AT STORM DRAINAGE PIPE, OR 15 FEET FROM THE TOP OF ANY CHANNEL BANK. ADVANCE OF BACKFILLING ALL CONSTRUCTION. MAINTENANCE, REPLACEMENT AND ADDITIONS TO EROSION/SEDIMENTATION CONTROL U) cL MANUFACTURER'S RECOMMENDED RATE TO ASSURE 3" M#NIMUM PENETRATION. SYSTEMS SHALL BE THE RESPONSIBILITY OF THE PERMITTEE. Lv _j � 12. ALL CATCH BASIN GRATES SHALL BE DEPRESSED 0,10 FEET BELOW PAVEMENT LEVEL. 6. CONTRACTOR IS SOLELY RESPONSIBLE FOR THE MEANS, METHODS AND SEQUENCES OF x 0 CONSTRUCTION AND FOR THE SAFETY OF WORKERS AND OTHERS ON THE 4. THE EROSION AND SEDIMENTATION CONTROL SYSTEMS DEPICTED ON THIS DRAWING ARE � � z w 16. PONDING OR "BIRDBATHS" EXCEEDING 1/4" IN DEPTH SHALL NOT BE ACCEPTABLE AND 13. OPEN CUT ROAD CROSSINGS AND EXISTING PUBLIC RIGHT-OF--WAY WILL NOT BE CONSTRUCTION SITE. INTENDED TO BE MINIMUM REQUIREMENTS TO MEET ANTICIPATED SITE CONDITIONS, AS Lr_1 SHALL BE CORRECTED BY TI"JE CONTRACTOR. ALLOWED UNLESS SPECIFICALLY APPROVED BY CITY OF RENTON DEPARTMENT OF PUBLIC CONSTRUCTION PROGRESSES AND UNEXPECTED OR SEASONAL_ CONDITIONS DICTATE, > � WORKS, DESIGN ENGINEER. 7. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO OBTAIN STREET USE AND ANY THE PERMITTEE SHALL ANTICIPATE THAT MORE EROSION AND SEDIMENTATION CONTROL `� O N 00 17. OWNER SHALL OBTAIN THE SERVICES OF A QUALIFIED SOILS ENGINEER FOR FACILITIES WILL. BE NECESSARY TO INSURE COMPLETE SILTATION CONTROL ON THE ® 00 N r_ w 5 SUBGRADE BACKFILL DENSITY TESTS, DIRECTION OF REMOVAL AND REPLACEMENT OF I L A• OTHER RELATED PERMITS PRIOR TO ANY CONSFRUCTION. 0) (0 00 r-r- z / 14. ROCK FOR EROSION PROTECTION OF ROADSIDE DITCHES, WHERE REQU RE T, SH. L L BE PROPOSED SITE. DURING THE COURSE OF CONSTRUCTION, IT SHALL BE THE AT MAY � U-1 L� F UNSTABLE MATERIAL, ETC., TO THE SATISFACTION OF THE CITY. OF SOUND QUARRY ROCK PLACED TO A DEPTH OF 1 FOOT AND MUST MEET THE AND RESPONSIBILITY OF TTIE PERMITTEE TO ADDRESS ANY NEW CONDITIONS THAT Y « I I w ANY ENCOUNTERED R Q 8. PLANS APPROVED BY THE CITY OF RENTON, PUBLIC WORKS DEPARTMENT SHALL TAKE � � h < ;- T" Z � ANY ENCOUNTERED PROBLEMS REQUIRE NOTIFYING THE ENGINEER. FOLLOWING SPECIFICATIONS: 4° INCHES TO 8 INCHES/40 PERCENT TO 70 PERCENT PRECEDENCE OVER ALL OTHER PLANS. BE CREATED BY HIS ACTIVITIES AND TO PROVIDE ADDITIONAL FACILITIES, OVER AND � Lo In 6 z PASSING; 2 INCHES TO 4 INCHES ROCK 30 PERCENT TO 40 PERCENT PASSING; AND -2 R ABOVE MINIMUM REQUIREMENTS, AS MAY BE NEEDED TO PROTECT ADJACENT CV C 4 z `_ N F INCHES ROCK/10 PERCENT TO 20 PERCENT PASSING. 9. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER PROPERTIES AND WATER QUALITY OF THE RECEIVING DRAINAGE SYSTEM. �7 I-- cc j �`' 18.. ANY REVISIONS MADE TO THESE PLANS MUST BE REVIEWED AND APPROVED BY THE DEVELOPER'S ENGINEER AND THE CITY OF RENTON PRIOR TO ANY IMPLEMENTATION CONSTRUCTION IS IN PROGRESS. 00 Ld ~� 15. ALL BUILDING DOWNSPOUTS AND FOOTING DRAINS SHALL BE CONNECTED TO THE 5. APPROVAL OF THIS PLAN IS FOR EROSION/SEDIMENTATION CONTROL ONLY. IT DOES NOT 00 L�1 N tV 0 V) IN THE FIELD. STORM DRAINAGE SYSTEM UNLESS APPROVED F3'Y THE DEPARTMENT OF PUBLIC WORKS, 10. THE CONTRACTOR SHALL PROVIDE THE CITY OF RENTON WITH AN AS-BUILT DRAWING CONSTITUTE AN APPROVAL OF STORM DRAINAGE DESIGN, SIZE NOR LOCATION OF PIPES, DESIGN ENGINEER OR STOPMWATER UTILITY. AN ACCURATELY DIMENSIONED CERTIFIED OF THE SANITARY SD-' ER SYSTEM WHICH HAS BEEN STAMPED AND SIGNED BY A RESTRICTORS, CHANNELS, OR RETENTION FACILITIES. 19. BURIED UTILITIES ARE SHOWN IN THEIR APPROXRAATE LOCATION. THE CONTRACTOR AS-BUILT DRAWING OF THIS DRAINAGE SYSTEM WILL BE SUBMITTED TO THE CITY OF LICENSED PROFESSIONAL ENGINEER OR LICENSED PROFESSIONAL SURVEYOR. SHALL HAVE :aL UIILITIEq VERIFIED ON THE GROUND PRIOR TO ANY CONSTRUCTION. RENTON UPON COMPLETION. 6 DURING T14E TIME PERIOD OF NOVEMBER 1 THROUGH MARCH 31, ALL PROJECT 11. BACKFILL SHALL BE PLACED EQUALLY ON BOTH SIDES OF THE PIPE IN LAYERS WITH DISTURBED SOIL AREAS GRATER THAN 5,000 SQUARE FEET THAT ARE TO BE LEFT K• CALL (1-800-424-5555) AT LEAST 4€3 HOURS IN ADVANCE, THE OWNER AND HIS 16. ISSUANCE OF THE EUILDING OR CONSTRUCTION PERMIT BY THE CITY OF RENTON DOES - �. UNWORKED FOR MORE THAN 12 HOURS, SHALL BE COVERED BY MULCH SODDING OR \ ENGINEER SHALL BE CONTACTED IMMEDIATELY IF A CONFLICT IS DETERMINED. CONTINUING I ) Y LOOSE AVERAGE DEPTH OF 6 PERCENT MAXIMUM DEPTH OF 8 INCHES, THOROUGHLY � NOT RELIEVE THE OWNER OF THE CONTIN J@Na LEGAL OBLIGATION AND/OR LIABILITY TAMPING EACH LAYER TO 95 PERCENT OF MAXIMUM DENSITY. THESE COFdPACTEO PLASTIC COVERING. w CONNECTED WITT{ STORM SURFACE WATER DISPOSITION. FURTHER, THE CITY OFTHE } , . LAYERS MUST EXTEND FOR ONE PIPE DIAMETER ON EACH SIDE OF THE PIPE OR 'TO STRIPPED RENTON DOES NOT ACCEPT ANY OBLIGATION FOR THE PROPER FUNCTIONING AND S F E S 7. IN ANY AREA WHICH HAS BEEN OF VEGETATION AND WHERE NO FURTHER 20. A.l_L. ,.SPOT ELEVATIONS SHOWN ON GRADING PLAN ARE TO TOP OF PAVEMENT .SIDE OF Tli_ TRENCH. MATERIALS TO COMPLETE THE FILL. OVER PIPE SHALL BE TI{E SA-ME � MAINTENANCE OF THE SYSTEF,# PROVIDED DURING CONSTRUCTION. A5 DESCRIBED WORK IS ANTICIPATED FOR A PERIOD OF 30 DAYS OR MORE, ALL DISTURBED AREAS UNLESS OTHERWISE NOTED. MUST BE IMMEDIATELY STABILIZED WITH MULCHING, GRASS PLANTING OR OTHER 17. TTIE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARD, 13, DATUM SHALL BE CITY OF RENTON U.S.C. AND G.S. APPROVED EROSION CONTROL TREATMENT APPLICABLE TO THE TIME OF YEAR IN ' 5672 1 .. '"'ONS'TR!JCF DRAINAGE' SWALES T"0 DRAIN AWAY FROM BACK, SIDES AND FRONTS OF ALL SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, AND ANY OTHER NEEDED QUESTION. GRASS SEEDING ALONE WILL BE ACCEPTABLE ONLY DURING THE MONTHS FG '< 6, ACTIONS TO PROTECT THE LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO PROTECT OF APRIL THROUGH SEPTEMBER INCLUSIVE. SEEDING MAY PROCEED, HOWEVER, FPS Y S T E`� �� ,�v BUILDING AS NECESSARY, 1.0% MINIMUM SLOPE, 2.0% PREFERRED j O Y THE 13. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION WHENEVER IT IS IN T14E INTEREST OF H ERMITTE I M X A F��'PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK COVERED B H_ THE P E, BUT .UST BE AUGMENTED WITH L � Gp CONTRACT. ANY WORK WITHIN THE TRAVELED RIGHT-OF--WAY THAT MAY INTERRUPT IN ACCORDANCE WITH SECTION 7-02.3(1) OF THE CURRENT i STATE OF WASHINGTON MULCHING, NETTING, OR OTHER TREATMENT APPROVED BY THE CITY OF RENTON, _ cz. ALL "ENGOiNEERED FILLS" SI AI_L BE COMPACTED TO 95% MAXIMUM DENSITY (ASTM NORMAL TRAFFIC FLOW SHALL, REQUIRE AN APPROVED TRAFFIC CONTROL PLAN BY THE STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION. THIS SHALL OUTSIDE THE SPECIFIED TIME PERIOD. EXPIRES/ • - D--1557). ALL IMPORTED FILL MATERIAL SHALL BE RANK RUN GRAVEL, CLASS "B." THE TRAFFIC ENGINEERING DIVISION OF TTIE DEPARTMENT OF PUBLIC WORKS. ALL SECTIONS INCLUDE NECESSARY LEVELING OF THE TRENCH BOTTOM OR TFIE TOP OF THE �` FOUNDATION MATERIAL AS WELL AS PLACEMENT AND COMPACTION OF REQUIRED 8. FOR ALL EROSION/SEDIMENTATION EMBANKkAENTS SFIALL BE CONSTRUCTED IN SUCCESSIVE HORIZONTAL_ LA'fiERS NOT OF THE WSDUT STANDARD SPECIFICATIONS 1-07.23, TRAFFIC CONTROL, SHALL APPLY. A CONTROL PONDS WHERE THE DEAD STORAGE DEPTH p EXCEEDING 8 INCITES IN LOOSE THICKNESS WHICH INCLUDES FILL IN CULVERT AREAS. BEDDING MATERIAL TO UNIFORM GRADE SO THAT THE ENTIRE LFNG111 OF THE PIPE WILL EXCEEDS 6 INCHES, A FENCE,'A MINIMUM OF 3 FEET HIGH IS REQUIRED, WITH 3:1 SIDE CITY OF RENTON 18. SPECIAL DRAINAGE MEASURES WILL BE REQUIRED IF THE PROJECT LOCATION IS WITHIN BE SUPPORTED ON A UNIFORMLY DENSE UNYIELDING BASE, PIPE BEDDING SHALL BE PEA SLOPES. E?EPAR T MENT C:)f= PUBITIC WC)RKS 23. DETRIMENTAL AMOUNTS OF ORGANIC MATERIAL SHALL. NOT BE PERMITTED IN FILLS, THE AQUIFER PROTECTION AREA. GRAVEL 6 INCHES ABOVE AND BELOW THE PIPE. EXCEPT AS PERMITTED BY' THE BUILDING OFFICIAL AND/OR SOILS ENGINEER, NO RUCK 9. A TEMPORARY GRAVEL CONSTRUC"T10hJ ENTRANCE, 24' X 5O` X 8- OF 4 TO 6 INCH OR SIMILAR IRREDUCIBLE MATERIAL WITH A MAXIMUM DIMENSION GREATER THAN 12 INCITES 14, SANITARY SEWER PIPE SHALL BE POLYVINYL CHLORIDE (PVC) RUBBER GASKETED QUARRY SPALLS SHALL BE LOCATED AT ALL POINTS OF VEHICULAR INGRESS AND EGRESS ASTM D 3034, SDR 35, OR DUCTILE IRON CLASS 50. TO THE CONSTRUCTION SITE. SHALL BE BURIED OR PLACED IN FILLS. ALL IMPORTED MATERIAL SHALL BE IMPORTED Nuv _ I 'W GRAVEL, CLASS "B" BANK RUN OR BETTER. DEVELOPMENT PLANNING 24. THIS CONSTRUCTION SET OF DRAWINGS FOR THIS PROJECT (CIVIL) INCLUDE A TOTAL OF 8 0 SHEETS. GENERAL NOTES AND DETAILS PROVIDED THROUGHOUT THE DRAWINGS SHALLDRSIGNED DATE 6 26 97 FILE NO. APPLY TO ALL SHEETS AS APPLICABLE. SPECIFICATIONS OR DETAILS PROVIDED ON ONE DRAWN MTS SHEET MAY APPLY TO OTHER SHEETS. CHECKED DKB _ SCALE 1"= AS SHOWN IlEL.D BOOK PAGE_ uj NO. RE`nSIQTT BY LAPPOIJ DATE APPROVED 0oiPEcrcr� of Puauc WORKS SFIEET- � OF File: P;\SDSKPROJ\6116\ENGINEERIP�IG\6116PDI.D'WG Date/lime": 1 i/"20,/19`a7 08:28 Scale: 1=10 tdarkS Xrefs: Z.6116-l"P, I Ed