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Home My WebLink AboutReport 03Genesis Grounds J\.iainlenance Inc. P.O. Box 353 Maple Valley, Washing10n 98038 .~( o ('~) \.:"'':' . r, " c~· ':., <.) ~'-,-/ .,.--~ ... -,.~ C'. c? ,-, .,,--- Department Of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 .-' ·'~e.o'S~ -'\. '2:'\' ';.\ 02 11,1 .. 1"1,11""1,1,,1,1,,,,11,,1,1,,,111,1,,1,1,,1,1,",I,ll Department of Development & Environmental Services Land Use Services Division 900 Oakesdale Ave. SE Renton, WA 98055-1219 Please add me as a "Party of Record" including notification of the public hearing and other official notices concerning this application. FileNo's: LOZJ..PCX::::()S Name: Company: Address: Telephone: Steve Fiksdal John L. Scott Real Estate 3380 1461h PI. SE, Suite 450 Bellevue, W A 98007 (206) 230-7680 ( ======;=;==;;====;====;=============================== Please send me notification of the public hearing and other official notices concerning this application. File No. L02POOOS -East Renton Subdivision (!'leaseprint) R re I ADd r0d'l Name. 0 ct. o. ~ Address: ~ 0 f) ox: ,3S 3 q~03 ~ '::0l 6 pQ Q V~WCl' Telephone No.: yas 43d.. 1060 LUSDIFORMS/LUSD Forms Staffrrype 3 Notice of Application Updated 81910 I , 1~~Fe CITY OF RENTON ..u. Economic Development, Neighborhoods -and Strategic Planning ,=' ... 0:'" 0" .... ... .... ... 1055 South Grady Way -Renton Washington 98055 ADDRESS SERVICE REQUESTED n ~j ,-;) p ,.) ~' " :.::.:. c: <-, . '- DOES L'and Use Services Division :,900 Oakesdale Avenue SW Renton. WA 98055-1219 D6ALAnp 98855 11.1 •• 1 •• 1.11 •••• 1.1 •• 1.1 •••• 11 •• 1.1 ••• 11 •• 1.111 ••• 11 ••• 1 ••• 11 Please send me notification of the public hearing and other official notices concerning this application. File No. L02POOOS -East Renton Subdivision LUSD/FORMS/LUSD Forms StafflType 3 Notice of Application Updated 8/9/01 Please send me notification of the public hearing and other official notices concerning this application. File No. L02POOOS -East Renton Subdivision (P/easeprint) ~\d-r.-,~ . Name: ___ · __ -' r---_'-'-=--'--==--,-_'---A.::::=-'-'''''''-__ -==----___ --=,--____________ _ Address:'==-'\\:--"-~5.-L.>..-\~_='___-'-\ ~~L.;q.=' ''----::,.:-h-9'-----=-_£-.-:.'----=S''---'-. ~==-_--.,--__ _ ~~~LDO-98a:t7 Telephone No.: L\7S '2~?;$:-5'-t , i , LUSDIFORMS/LUSD Forms StafflType 3 Notice of Application Updated 8/9/0 I In 21;, .. : " U i, ;~: i 7 1\. ~ . J L; • ..' ._ . .) ;: ~ \ ~ ::~ : t II J---rt. . r:.y ~ .~ t . ~/ i! I , Camwest -E. Renton· King County, Washington Levell Downstream Drainage Analysis Prepared by: GeoffE. Tamble, P.E. Reviewed by: Clay A. Loomis, P.E. TRIAD ASSOCIATES March 27,2002 o \D q)o1.uJ jQJ ["D) [g©[g~W~[ID LnJ APR 0 3 2002 K.C. D.D.E.S. MAIN FILE COPY ~-----l Camwest -E. Renton King County, Washington Level 1 Downstream Drainage Analysis ~epared by: .offE. Tamble, P.E. Reviewed by: Clay A. Loomis, P.E . • IAD ASSOCIATES March 27,2002 , ' Triad Job No. 01-047 / • • • TABLE OF CONTENTS SECTION I : PROJECT OVERVIEW .................................................................................................... 1-1 GENERAL DESCRIPTION OF PROPOSAL.. .................................................................................................... 1-I PREDEVELOPED CONDITION OF SITE ......................................................................................................... 1-I DEVELOPED CONDITION OF SITE .............................................................................................................. 1-2 OFFSITE STORMWATER RUNOFF ............................................................................................................... 1-2 Vicinity Map. ............... ........................ ................... . ........... 1-3 Drainage Basin, Subbasins and Site Characteristics ........................................................................ 1-4 SECTION II : CONDITIONS AND REQUIREMENTS SUMMARy ................................................ II-I SECTION III: OFF-SITE ANALySIS .............•................•.........................................................•.....•.. 111-1 STUDY AREA ........................................................................................................................................ 111-1 Task I. Study Area Definition and Maps . ...................... ..................... . .............. lll-I Onsite Basin ................. . .... lll-I Upstream Basin. ............... .. . ................... . .... lll-I Task 2. Resource Review.. ............... . .. lll-2 Task 3. Field Inspection. .............. . .................. .................. . ....... lll-3 Task 4. Drainage System and Problem Description... . ...................... lll-3 Task 5. Mitigation of Existing and Potential Problems ......................................................... lll-4 SECTION IV : FLOW CONTROL AND WATER QUALITY .........................................•................ IV-I SECTION V: CONVEYANCE SYSTEM DESIGN ...................................................•.•........................ V-I SECTION VI : SPECIAL REPORTS AND STUDIES ..............•....................•.............•...................... VI-I MINOR FLOODPLAIN ANALYSIS ............................................................................................................ VI-I SECTION VII: OTHER PERMITS ................................................................................................... VII-I SECTION VIII : EROSION AND SEDIMENT CONTROL ........................................................... VIII-I SECTION IX : BOND QUANTITIES, ETC. ........................................................................................ IX-I BOND QUANTITY WORKSHEET .................................................................................................. IX-I FACILITY SUMMARY ...................................................................................................................... IX-I DECLARATION OF COVENANT ..................................................................................................... IX-I SECTION X: OPERATIONS AND MAINTENANCE ......................................................................... X-I TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, I:."AST RENTON PAGE i • • • ---------------------------------------------- LIST OF SUPPLEMENTAL INFORMATION Note: Where applicable, supplemental information is located at the end of each section. Section I: Soils Map Soils Legend Table 3.2.2B -Equivalence between SCS Soil Types and KCRTS Soil Types Section III: King County Drainage Basins (Figure 2) Study Area Maps (1990 King County Sensitive Areas Map Folio) Wetlands Streams and IOO-Year Floodplains Erosion Hazard Areas Landslide Hazard Areas Seismic Hazard Areas Coal Mine Hazard Areas King County Off-Site Analysis Drainage Table Downstream Drainage Exhibit Existing Conditions Exhibit Developed Conditions Exhibit (Conceptual Site Plan D) Drainage Complaints List Drainage Complaints List Exhibit TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE ii • SECTION I: PROJECT OVERVIEW This section gives an overview of the project site both pre-developed and developed. There is also a description of the runoff characteristic of the property and the existing soil classification. The proposed project consist of a Single Family Residential Development for 66-lots in a R-6 zone. The site consists of two existing lots that total approximately 19.6± acres, with approximately S.2± acres of sensitive areas to remain undeveloped that include a wetland and a hawks nest (Please Reference Preliminary Exhibit in Appendix). The project is located west of the intersection of l4S 'h Ave SE and SE 1201h St. in King County; Section 10, Township 23 north, Range 5 east, W.M., Washington State. GENERAL DESCRIPTION OF PROPOSAL In general, this project will replace one existing single-family home, a shop, a small covered storage building, and a gravel driveway with 66 single-family lots. Part of the • major site improvements will include the installation of neighborhood access streets (sub- collector, subaccess, and minor access). l4S 'h Ave SE will be improved with full half . street improvements as required by the King County conditions of approval (To be determined). All runoff from the site and most of the runoff from the frontage will be collected in the proposed conveyance system and directed to the proposed detention/water quality facility located along the northern boundary of the site. Please see "Preliminay Plan Map", in the Appendix of Section III, for a general description of the proposed improvements. The dimensions of the proposed lots and roadways will require wetland filling and buffer averaging on the western portion of the site. • PREDEVELOPED CONDITION OF SITE The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. (Please reference the "Existing Conditions Exhibit" for locations of each structure). TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE 1-1 • The site has one drainage basin that generally drains towards the northwest within the property and then flows to the north through Honey Dew (Honey) Creek. A wetland occupies the western portion of the site. Overall, the site slopes from east to west at approximately 5-15%. The site generally slopes from 148 1h Ave SE down to the west towards Honey Dew Creek. DEVELOPED CONDITION OF SITE The developed site improvements will be located on the eastern 11.4± acres of the property. The preliminary plans are showing 66 single-family lots with subcollector, sub- access and minor access roadway improvements. 1481h Ave SE will be improved with full half street improvements as required by the King County conditions of approval (To be determined). Sections of the wetland that need to be filled for the project will be restored or compensated for as directed by King County. The detention/water quality facility will be designed to meet the Level I Detention Standards and the Basic Water Quality Menu from the 1998 King County Surface Water Design Manual. • OFF SITE STORMW ATER RUNOFF • Flows entering the site from the east come from the west half of 1481h Ave SE. Runoff entering the site from the west and south adjacent to the wetland is collected in the wetland area. The wetland area will remain undeveloped. Runoff generally does not enter the site along the north and south property lines near the proposed lots since the site slopes from east to west. TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE 1-2 • • Vicinity Map NTS TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE 1-3 • • • Drainage Basin, Subbasins and Site Characteristics The existing site one drainage basin that drains into Honey Dew (Honey) Creek, which, according to the December 1990 King County Sensitive Areas Map Folio, is an unclassified stream in the May Creek Sub-Basin. Honey Dew Creek combines with May Creek over two miles downstream (north) of the site. May Creek is in the Cedar River Drainage basin and ultimately discharges into Lake Washington. The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. According to the King County Soil Survey, the site is underlain with Alderwood soils belonging to the S.C.S. type 'c' hydrologic group or 'Till Soils'. Onsite topography is mild to moderate, sloping to the west at approximately 5% to 15%. Please refer to the Soils Map, as well as the Existing Conditions Map, located in the appendix of this report. Note: The 1990 King County Wetland Inventory did not list the wetland on this property. The 1987 Basin Reconnaissance Program did not list Honey Dew (Honey) Creek in any of its basin reconnaissance data. TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE 1-4 AgD I I I I I ;4!'ff""",c=="b,~~· _ •.•••••• : I I I I I .. Age , . ,. , , " " .,,11 • Age 14 ,~ •• " ." . " " -',II -.:: Py AkF EvB 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 infonnation is given in ,tables as follows: • Acreage and extent, table 1, page 9. Engineering uses of the soils, tables 2 and 3, pages 36 through 5S. Town and country planning, table 4, page 57. Recreational uses, table S, page 64. Estimated yields, table 7. page 79. Nap synbol Mapping unit Described On page • AgB-Aldeniood gravelly sandy loam, 0 to 6 percent slopes---------- .AgC---Alderwood gravelly sandy loam, 6 to 15 percent siopes--------- AgD Alderwood gravelly sandy loam, IS to 30 percent slopes-------- AkF Alderwood and Kitsap soils, very steep------------------------ AmB Arents, Alderwood material, 0 to 6 percent slopes 1/---------- Arne Arents, Alderwood material, 6 to 15 percent slopes-l/--------- An Arents, Everett material !I-------------~----------~--------- BeC Beausite gravelly sandy loam, 6 to 15 percent slopes---------- BeD Beausite gravelly sandy loam, 15 to 30 percent slopes--------- BeF Beausite gravelly sandy loam, 40 to 75 percent slopes--------- Bh Bellingham silt loarn------------------------------------------ Br Briscot silt loarn--------------------------------------------- Bu Buckley silt loam--------------------------------------------- Cb Coastal beaches----------------------------------------------- Ea Ed EvB EvC EvD EwC InA InC I KpD KsC Ma NeC Ng Nk No Or Os OVC OvD OvF Pc Pk Pu Py Rae RaD RdC RdE • Earlmont silt loam--------------------------------------------Edgewick fine sandy loam---_---______________________________ _ Everett gravelly sandy loam, 0 to 5 percent slopes------------ Everett gravelly sandy loam,S to 15 percent siopes----------- Everett gravelly sandy loam, IS to 30 percent slopes---------- 'Everett-Alden/ood gravelly sandy loarns, 6 to 15 percent slopes------------------------------------------------------ Indianola loamy fine sand, 0 to 4 percent slopes-------------- Indianola loamy fine sand, 4 to 15 percent slopes------------- Indianola loamy fine sand, IS to 30 percent slopcs------------ Kitsap silt loam, 2 to 8 percent slopes----------------------- Kitsap silt loam, 8 to 15 percent slopes---------------------- Kitsap silt loam, 15 to 30 percent slopes--------------------- Klaus gravelly loamy sand, 6 to 15 percent slopes------------- Mixed alluvial land------------------------------------------- Neilton very gravelly loamy sand, 2 to 15 percent slopes------ Newberg silt loam--------------------------------------------- Nooksack silt loam-------------------------------------------- Norma sandy loam---------------------------------------------- Orcas peat---------------------------------------------------- Oridia silt loam---------------------------------------------- Ovall gravelly loam, 0 to 15 percent slopes------------------- Ovall gravelly loam, IS to 2S percent slopes------------------ Ovall gravelly loam, 40 to 75 percent slopes------------------ Pilchuck loamy fine sand-------------------------------------- Pildmck fine sandy loam-------------------------------------- Puget silty clay loam----------------------------------------- Puyallup fine sandy loam-------------------------------------- Ragnar fine sandy loam, 6 to }5 percent slopes---------------- Ragnar fine sandy loam, 15 to 25 percent slopes--------------- Ragnar-Indianola association, sloping: 1/---------------------- Ragnar soil-----------------------~---------------------- Indianola soil------------------------------------------- Ragnar-Indianola association, moderately steep: 1/------------ Ragnar soil--------------------------------~------------ Indianola soil------------------------------------------- 10 8 10 10 10 10 I! I! 12 12 12 13 13 14 14 15 15 16 16 16 17 16 17 17 18 18 18 18 19 19 20 20 21 21 22 23 23 23 23 24 24 25 26 26 26 Woodland Capability unit group Symbol Page Synbol IVe-2 76 3d2 IVe-2 76 3dl VIe-Z 78 3dl VIle-I 78 2dl IVe-2 76 3d2 IVe-2 76 3d2 IVs-l 77 3£3 IVe-2 76 3d2 VIe-2 78 3dl VIle-1 78 3dl IIIw-2 76 3w2 IIw-2 75 3wl HIw-2 76 4wl VIIIw-1 78 IIw-2 75 3w2 II Iw-I 75 201 IVs-l 77 3£3 VIs-l 78 3£3 VIe-l 77 3i2 VI5-1 78 3f3 IVs-2 77 453 IVs-2 77 453 VIe-l 76 452 lIIe-l 7S 2d2 lVe-} 76 'd2 Vle-2 78 2dl VIs -1 78 3f1 VIw-2 78 201 VIs-l 78 3i3 IIw-l 74 201 IIw-1 74 201 IIIw-3 76 3w2 VIIIw-1 78 IIw'-2 75 3wl IVe-2 76 3dl VIe-2 78 3dl VIIe-l 78 3dl Vlw-l 78 251 IVw-l 76 251 IIIw-2 76 3w2 IIw-l 74 201 IVe-3 77 451 VIe-2 78 451 -------- lVe-3 77 451 IVs-2 77 453 -------- VIe-2 78 451 VIe-1 77 452 U. s. GOVERNMENT PRINTING OFFICE: 1973 0 -46B_2M 3.2.2 KCRTSIRUNOFFFILES METHOD-GENERATING TIME SERIES TABLE 3.2.2.B EQUIVALENCE BETWEEN SCS SOIL TYPES AND KCRTS SOIL TYPES SCS Soil Type SCS KCRTS Soil Notes Hydrologic Group • Soil Group Alderwood (AgB, AgC, AgD) C Till Arents, Alderwood Material (AmB, AmC) C Till Arents, Everett Material (An) B Outwash 1 Beausite (BeC, BeD, BeF) C Till 2 Bellingham (Bh) D Till 3 Briscot (Br) D Till 3 Buckley (Bu) D Till 4 Earlmont (Ea) D Till 3 Edgewick (Ed) C Till 3 Everett (EvB, EvC, EvD, EwC) AlB Outwash 1 Indianola (InC, InA, InD) A Outwash 1 Kitsap (KpB, KpC, KpD) C Till Klaus (KsC) C Outwash 1 Neilton (NeC) A Outwash 1 Newberg (Ng) B Till 3 Nooksack (Nk) C Till 3 Norma (No) D Till 3 Orcas (Or) D Wetland Oridia (Os) D Till 3 • Ovall (OvC, OvD, OvF) C Till 2 Pilchuck (Pc) C Till 3 Puget (Pu) D Till 3 Puyallup (Py) B Till 3 Ragnar (RaC, RaD, RaC, RaE) B Outwash 1 Renton (Re) D Till 3 Salal (Sa) C Till 3 Sammamish (Sh) D Till 3 Seattle (Sk) D Wetland Shalcar (Sm) D -Till 3 Si (Sn) C Till 3 Snohomish (So, Sr) D Till 3 Sultan (Su) C Till 3 Tukwila (Tu) D Till 3 Woodinville (Wo) D Till 3 Notes: 1. Where outwash soils are saturated or underlain al shallow depth «5 feet) by glacial till, they should be treated as till soils. 2. These are bedrock soils, but calibration of HSPF by King County DNR shows bedrock soils to have similar hydrologic response to till soils. 3. These are alluvial soils, some of which are underlain by glacial till or have a seasonally high water table. In the absence of detailed study, these soils should be treated as till soils. 4. Buckley soils are formed on the low-permeability Osceola mudflow. Hydrologic response is assumed to be similar to that of till soils. • 1998 Surface Water Design Manual 9/1/98 3·25 • SECTION II: CONDITIONS AND REQUIREMENTS SUMMARY This section gives a summary of the Conditions of Approval and Special Requirements affecting the design of this project (if any). • • There are no known conditions of approval or special requirements for this project at this time. -----....... ,--.. --_._---, TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE II-I • SECTION III: OFF-SITE ANALYSIS This section outlines the drainage basin, which this project is located, highlighting the downstream conditions one mile from the project site. STUDY AREA . Task 1, Study Area Definition and Maps This site is located within the May Creek Sub-Basin of the Cedar River Basin. Onsite Basin The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. Most of the trees are located in the western half of the site with the pasture area occupying the eastern portion. The blackberries are located throughout the property. • According to the King County Soil Survey, the site is underlain with Alderwood soils belonging to the S.C.S. type 'C' hydrologic group or 'Till Soils'. On site topography is mild to moderate, sloping to the west at approximately 5% to 15%. Please refer to the Soils Map in the Appendix of Section I, as well as the Existing Conditions Map located in the Appendix of this section. • Upstream Basin Approximately half of 148 th Ave SE along the entire site frontage currently sheet flows into the site. Flows from the frontage improvements will be collected and conveyed to the proposed detention/water quality facility. The area where flows enter the site from the south and west adjacent to the wetland will remain undeveloped . TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON I' AG E III-I • Task 2, Resource Review "1998 King County Surface Water Design Manual" "1990 King County Sensitive Areas Map Folio" "1973 King County Soil Survey" "King County Water and Land Resources (WLR) Division Drainage Complaints" According to the King County Drainage Complaint List, only three complaints have been documented near the property and the downstream drainage course. The complaints are over 12 years old and any documented follow up to each complaint has been archived. King County suggests not following up on any complaints before 1990 due to their age, development that has occurred, etc. Additionally, no complaints have been documented at those addresses for 12 years, so the problem most likely has been corrected. The complaints are linked to a private home drainage system and a private road washout due to no drainage system rather than flooding, or erosion of the large drainage course that • our site will discharge to. • TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMIVEST, EAST RENTON PAGE 111-2 • Task 3, Field Inspection "Triad Associates" did a field visit on 4/03/01 to locate any potential problems upstream or downstream of the proposed development. The weather was overcast and approximately 55 degrees with small amounts of runoff in the drainage systems from the previous day's rainfall. Drainage leaving this property is collected in an existing wetland (A) and conveyed offsite to the north through two 12" CMP culverts (Bl & B2). The onsite wetland has a slight ridge separating the wetland on the north property line of the site. The runoff that leaves the through the two 12" CMP culverts combines in a drainage ditch adjacent to the north property line (C). From here the runoff flows to the north through a natural drainage course called Honey Dew (Honey) Creek (D) for about 500' before entering a 24" CMP private driveway culvert (E). The property owner adjacent to the culvert stated that it has only flooded once, around IS-years ago, when a neighbor downstream of their property dammed up the creek to make a waterfall. The waterfall has been removed and • the culvert has not flooded since that time. From this culvert, the natural drainage course continues to the north in a well-defined channel with heavy ground cover (F). The final observation of the downstream investigation was approximately 2000' downstream of the site (G). No evidence of flooding or major erosion was observed along the downstream drainage course during the site visit. From the last observed point in Honey Dew (Honey) Creek (G), runoff continues north then west before combining with May Creek and eventually reaching Lake Washington about 6 miles to the West. See the "Downstream Drainage Exhibit" at the end of this section for a complete definition of the Study Area. • Task 4, Drainage System and Problem Description There were no apparent problems downstream of this project. TRIAD ASSOCIATES· DRAINAGE REPORT FOR CAMWEST. EAST RENTON PAGE 111-3 -------------------- • • • Task 5, Mitigation of Existing and Potential Problems The developed site runoff will be detained to the Level I standard as outlined in the King County Surface Water Design Manual -1998. This standard holds the developed two and ten year flows equal to the predeveloped rate. The site is proposing using one detention system. The detention facility release rates will be based on the existing runoff from the area of the site that is being developed. The wetland area and associated buffers will remain undeveloped. ----~------ TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE 111-4 • • = • , , :.; f. =. i' I. ___ • .L J ... --'--~ ~-"! ..... ------<:.;--........ -"'J ". ... '"' ., ,/ ..... .,.. ~., .... ,. '\ -, c," ..... TACOU .It _.- , ,~:,~.:~~. '2; ." , ;. ... ~ ..... -.-.. ..... ,."~ -1· j.'r....~ .--'-,,~/ -Y'" "1tusl ruiJiri"- ·~~r '-•... .1----...... ~.: .... -"" _ .. ____ :'7 ~. ~-- -.~ .... , .. .~'-". b·~ -~ \ ": ___ J ,=-, = ~. -.--.:..:.--~ =- ~"OQUAlH.!.! : , - /~IVER-" 'r~; :.;~ ~ T • I)'~ '" l " -, O';h , S ,:~. ..-.,":,>" . ; .~~:"\:::;=: \ ':~BA$IN~---.' .,.::- ',:" ~~~ . ..,...- =i ~-. -.... :.-;-.~- "'. .•.. -, • • c , c' ~ .< .... ". , a" ~ -." '.> • . -=.}, ~." '---t;., I "!:'!-;:'" ""' , ., l" \': : ," ' J.: ;~;'" , RIVER -~.-. . -. .. :: <J~\(~ ..• -;-~ :;--.. ".' , ~ > ..~~~i ::--- ./ . ";', .. xBASIN· . j. '" , --~::... .... ~~ '---- , -;--.: -·.S:" ~.~---- .. '-" ,fff., ..... '~"'~~~. ;,- "'-': .. <---: CIT\' 01' u"'nir,.~TtJlsHiO \ ~ ft _ 'i~"""::" --':"" \ \\ - ,_~FOfIo. --, -' '1'~;, r" ,I --~ "" -. \; -~--" \ r ",,-,-'Y.-'-" ; ~~,-.--,., ..... ,; . 1. ;i ::-'- -.,-!.:"',,-~' ..... ''-.--'l:;:5.:" Cl'TTOf"TIICOIUo ..... n:,. .... o ~,._ '_.,' __ '-. ""' --. :\ ". " ...... ,- "-, '\ .. " "-::r::- .-:. .. -~-- _0 ";, -~ .' ~y "\. . .,: ," " !' ,-', ~'- ./'-. ~'.,.. , ,/ '~ ~.~.", '~'''''';''':''' \, '.-'< " .--t. , ---". ';":.;" '= -~, , -,-- <-:-•. ':;': if .. ' , ._.r'~ .!~\~ .. " .f ; I I /' -=<s';'" --";~". ~.;::; -. ~. &_::~ Figure 2 DRAINAGE BASINS King CountY 1985 Major Basin Boundary Sub-Basin Boundary Source: King County Sensitive Areas Map Folio, Wetlands Supplement o 1 2 3 4 5 6 7 8 Miles 1: 300,000 1/90 ~ n 'a 'E 'a S ~ '0 0 {j , 0 ~ s j a e e ~ 8-~ iJ , 0 II> III I • • • • • • -----.----------------.------------~~ • • • • • • '0') o _ ,', . • • • UJ -' ~ ---/' • • • OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Surface Water Design Manual, Core Requirement #2 Basin: Cedar River Subbasin Name: May Creek Subbasin Number: Symbol Drainage Drainage Component Slope Distance Existing Potential Observations of field inspector Component Type Description from site Problems Problems resource reviewer, or resident Name, Size discharge Type: sheet, swale. constrictions, under capacity, ponding see map stream, channel, pipe, drainage basin, vegetation, % 1/4 mi = 1320 ft overtopping, ftooding,habitat or organism tributary area, likelihood of problem, pond; Size: diameter, cover, depth, type of sensitive destruction, scouring, bank sloughing, overflow pathways, potential impacts. surface area area, volume sedimentation, incision, other erosion C Honey Dew (Honey) 3-4' wide drainage channel 0.5% 10 ft None None unobstructed natural and man altered Creek . drainage channel D Honey Dew (Honey) 3-4' wide drainage channel 0.5% 480 ft None None unobstructed natural and man altered Creek drainage channel E 24" CM? Culvert 2-3' of cover under driveway 0.5% 500 ft None None if culvert overflows, it will cause no damage to private structures F-G Honey Dew (Honey) 3-12' wide drainage channel 0.5% 500 -2000 ft None None broad drainage channel with heavy Creek vegetation on both sides of channel Triad Associates ~!. ~V. RENTON ;;:L-e€'"'" c -=:....-::::.: -=-:--'-~-;::-c=.:...--= ~-. - . ~ . -. -\ . - . - . . ----. . . . - __ .';\,60 _ .. __ "._ . ___ ' C.M.$ ,~P,.W8..P, R R C:.'<'>'ff.Jr."" -TRANS ,T. 1', I ----1'4 . 4-~-<;" ,-'--'d-- I~ ~ ~ ~ tlrmJ John' Hansen 2.86 Ac. ~ 1f-____ ... ______ . __ . ___ 0j G I ~ Wi1l. E. Broyles I 91 Ac ~ I~~ n." Ae "," ... .-.---~:-.--- 6 ,SM'. 07 ~ Ae. ;;; @l f-. :. III N2~ ?iF I,,:;~ .:..,~. George: C DClvi s 2 18 Ac. ~ 4 r<' ~ wi 05.0 . ® 2 @) ~ .. . f/O> "1'1 It . _______ .. _._. ________ . __ . ____ .. _ ; Iver M (,lIhert . , ~ ::1 u:-~I uno:;; Cltl zen Fed. 5.8. L. Assn. ,. a:::' ,.re ·1· \ ~lJI8~ ~I;E t1ill.ke Hayer 2.~)S Ac. ~ {l~·20S. :,~ @ _ ~ @~ (2 I (11'EP5" '" :1 •. \ ___ .__ 0lf---.----. 63'4. 100 S.P.688009:: <!} NIJlI] ----1". ;0 40 ~;il ~~ \\1_ I~ Floyd W Silaff, ei ux 4.14 Ac. ~r-~-:I~-:-'-~i I ~ Fr"lIlclS P. Rrown 477Ac ~t F o@i"'I7iI(if:.I: !Ii? ~ ~ --------I 31,11 2S!J,U t:J ".. . : \:.:~) '" 1292 .. '97 --------,. :. ----·.:1 o ~ J ""0 ~ I~ Stanley J. Petersen 4.% Ac. ~.I' ,0 .. , ~ 8 ··1 . __ ~~ ~I ------.----.-______ 't~ 4C" ' Il ® lJ.J :::11 . ~ SP BB200Q R 160 ~ I 0 ~ ui (_ <::) ",.1 ~"'.I . ~ cf67Ac ~ @ : •. I ~ ~ ~ i:. -l;i!i'5~ I "1 ~ Henrj IJro 4.77 Ac. ~I~ Lionel Lesh ~ I' ~ "' " ®'" , w I"'l~' • "'. ....... /lC2[1 ,,' -DElJ" 60 "I ::: 1 1-~·l ·-Jtl ® : ~ 111 ~,;;o~-,~o~.~~--~~-;~'~~ .--------------.. ------------------,-,-1.-69--12'3.Yj' :;-·~(-"-6~1· \ :60J '@f 0 "'tEl ": zl c' ~ N~ '" Robert \ Starzman ;0;;(, . John M. Pollock §jJ :I ~ ! \ <5 ~ Z.oOAc. :::: r;,lure A lIeck5trolT1 5 Ae. First Sav. & Loan A5sn. :; ::I 1 .1 ° ~ f-8AC.~·I~ 4.70Ac ::1 a @j . <: ~II' @ ~ ~ I Th d .' 'lO"r--__ . __ . __ ..... __ ... ,"-'_" .... _. __ ... 4 E @ II o ";-;'\ T. s eYe] 1833 J ® 1(;5 eo are L. Binder -..... -.--.... --------.----__ -_._ ........... J~ ... -............ __ ._~~.-... -. . ........ :., •. Ifr----"'''-'U....-I~ 5.34 Ac. ~ . 1. 24" CMP CULVERT ··1\1 :\ fl:.:D i. SP 778111 CJ;" 121 (II ~ ® c 30o,~9 330.9?1 ~ . "'" II C i @Di.' 'I' i: ... 1, , . '~! I: ". , , ,. I 12" CMP CULVERT / 12" CMP CULVERT 1 ~'" + . ~ .i i,y~"i " "'. '-., B1"(·' ., :'c',\ •. B"··· 2" ;,'I(/IU,,' 1<"'~/I!%'//%·'·;:::::·-~-'-;'::'·~/"'''·''''''··i:I .. ,}1 ; , I i I }.',. ,. , ,'\ . ' , '" "",," . ,if", 'r _%//1/1/.. .. .... 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II iN3Wd0731130 lS3MW'o'::J ino)' '0'7 1'"11 )'lNnO::J 9NI)I I~ NDISLIlI un I~ N'o'7d )'ll71in )'II'o'NIWI73I1d n AS il ~ 1 :: .-.-. 1/ ~ 1/ ~ --. :!: --. II ~ ~ -'-. ;1 ::, '-.-. !!> , ' -.~. I ' ,", ... II) ~ c ~ :>'. "I "I., ",I " 1"1"1"1"1"1 --. -1--+-+-+ -t-ts-i I I ~ iil I -.-. " <c 1 :;) " I " '" '" '" I I I I :)l ~ ! [ " , " '" c L ., ., -.-. " I " '" ;; I " . " '-.-. -i--.~. " " .-.-. ~ iii /' , 'I . , . l, ' I -... ,. ~/ '" " '" " " " " " ., " .-.-. '" '" /. .. < \ I , ':.-: , , 1 ' , , , " -". , , , , .--,,--,_ J;-~ . , , -, -) . j. > t ". ._._-_._._ . ./"; ) ) , , , , > "/., •••• -•••••• I' , , > • ) • , • ' • • • • ~l) ) , ) ) 'i ' , ) ) , , ) / ' ) • • • <t, • • • • • l' -, ) , ).' > • '~'\' , , ,~ .. ,"-.) , .. ) ,.,........ ........ ,_ . . ' ) , . {., ,/ '·~0.-J·-),-·/ -, J' • • • • • / " j' "_' ) ; ......L.--!._'._ •. _' i., ••• ', ....... ' "-.- '\) ) ) '\ ' ......... ' ) ).-, ....... ,,-.., .-....! . .-'., ' • ) -/ "\, . ) '':', '-. > ,', -., > ' .... - .\ • ;;:-1\ • , ,y - \' >~, \ ,~., -~-\ .. ,\t', I .,......... I -\-> , , , ......... ,_.-.-. .!.... ........ ;-- -/"",)" ........... , \ /' • , ~ 1 If ' , , .. , , \' , /' / _, ,; "" 'l) , , \ ... '~'_'_' , / ....... -.....! I' ~J ' , , )' , , , ........ I ,. ..... .. ; j'I' ) , ),~, , " ............ ,'./ , ) ) l> , , ......, j'I' , , >,., ) ) f. ' > , ) , ....:....~ : -.-{ , > ) I f . > , , , '.. . , i " '-' , , , < I r !~~~ ~ ~ii I I" , '. d Ii i u~ r . i , ( " ,', . ',", ~ ~~ .§ ~~ L_. _______ =~-_------,=--_->::::.....;;;~.-J. .............................. . . ' • • --------------------- " .... e ~ <'.I ~~ 0 ~ >, ,.!. I!e 0 ~~ "~ • • " ~ Ii "' , " ~ -~ ~ " 1 -:: il ! w ~ 0 t3 11- "' I.~p I,1N.nIV~"'I"''''~I\.".,''~''\f'''m\,'I.'IIi''I~~I\.' "'''/!I:" • a~lI'.·w "I., • KinD COIDlty Watar and Land RBBourcB8 Division· DralnaU8 SarvlC8S Section IPlalnt Search Prinled: 414/01 2:10:42 PM plaint Typa Typa Dr Problom AddroSB or Problom Commonts lIlroB Paua Numbor Coda 1975-0004 C DRNG 9S8S UNSET BL SE 138THISUNSET BUANNEXED 626J6 1982·0033 C FLDG 12424 1SSTH AVE SE & DRNG CAUSED BY FILL 627A7 1982-0034 C 12404 155THAVE SE LANDFILL 627A7 1983·0046 C DRNG 11203 148TH AVE SE PONDING 626J6 1983-0049 C FLOG 15630 SE 124TH ST 627A? 1984·0015 C FLOG RENTON·ISSA HWY MAY CREEK 626J6 1986·0304 C PONDING 13812 SE 121ST ST 626J7 1986-0654 C FILLING 11203 148TH AVE SE 626J6 1966-0707 C FLDG 13837 5E 126TH ST 626J7 1987-0284 CL FlDG 14847 206THAVE SE BASEMENT FROM CULVERT· CLI/10S0S 627A6 1987·0382 C FLOG 11822 148TH AVE SE CLEARING AND GRADING 626J7 1987-0485 C DRNG 15004 SE 114TH ST NEIGHBOR FLOODING PROPERTY 627A6 1987·0485 ER TO RD DRNG FOR CM/RD COORD 10/27/87 627A6 1987-0485 NDA NO RD DRNG FOR CM/RD COORD 10/27/8 627A6 1987·0787 C DRNG 12808 138TH AVE SE 8S-03A4,87-0445,0707/ FILLING OF LOT 626J7 1988-0369 C DRNG 12003 138TH PL SE FROM CONSTRUCTION-RUNOFF 626J7 1988-0369 NDA DRAINAGE OHLD/SWM DIV-PLY.(NEW CONST). 626J7 1988-0713 C DRNG 14000 SE 128TH ST FILL OBSTRUCTION OF DITCH 626J7 e 0713 ER FILL 14000 SE 128TH ST (CEMTY RD). TO BALD-TSS CM 09/05/89. 626J7 1988-0713 NDA FILL (CEMTY RD).TO BALD-TS/PROB CRTD 626J7 1988·0787 C DRNG 15004 SE 114TH ST ILLEGAL INSTALLATION OF TILE 67-0485 627A6 1988-0790 C • DRNG 14418 SE 116TH ST INADEQUATE SYSTEM INSTALLED 626J6 1989-0084 C DRNG 11833 142NDAVE SE POND OVERFLOWING ONTO YARD 626J7 1989·0140 C • EROSION 14429 SE 116TH ST PVT RD WASHOUT DUE TO NO DRAINAGE 626J6 1989-0150 C • DRNG/ERO 14428 SE 116TH ST PVT RO WASHOUT DUE TO NO DRNG 89'() 626J6 1989-0318 E DRNG 11800 138TH AVE SE CLEARINGOF R/D NATURAL RID POND 626J6 1989-0534 C DRNG 14842 SE 114TH ST FILL OF DRAINAGE 87-0485 627A6 1989-0776 C FLOG 11644 142NDAVE SE FILLING OF LOT BEHIND/FLOODED CRAW 626J7 1989-0818 C DRNG 12266 155TH AVE' SE BSMT FLDGIWATER BACKING UP 627A7 1990-0226 C DRNG 14607 SE 128TH ST SHOULDER EROSION ON CONST SITE/ST 626J7 1990-0508 C DRNG 14842 SE 114TH ST DITCH FILLED IN 627M 1990-0712 CL FLOG 12266 15STH AVE SE CL#12965 627A7 1990-0982 C DRNG 15630 SE 116TH ST DITCH ENDS BY PROPERTY 627A6 1990-1097 C DRNG . 15630 SE 124TH ST CLEARING OF LARGE PROPERTY 627A7 1990-1184 C FLOG 14306 144TH AVE SE DICKSON/CLEARING FOR PLAT 627A7 1990-1464 C DRNG 12413 142NDAVE SE PLUGGED CULVERT BY ROAD 626J7 1990-1623 C FLOG 13611 SE 116TH ST @ RID FACILITY SEEPING WATER 626J6 • Pag.' 012 RPR. 4.2001 j. ZL:JPI~I f'C WCRD I,Q,I :1:0 ---,---;-;::::T -;,;,J----l Complaint Typo TWo of Problem Addr088 01 ProbJom CommslltB Ibros PSDO NwnhBJ' Coda •• 0216 C DRNG 12611 155TH AVE SE FLOODING OF BACK YARD 627A7 ·0216 SR DRNG 12611 155TH AVE SE PIPE SIZING/DITCH MAINTENANCE 627A7 1991-0339 C FLOG 11212 137TH AVE 5E PIPE OF PRIVATE DITCH 626J6 1991-0432 5R FLOG 15630 5E 124TH ST CLEARING OF LARGE PARCEL 627A7 1991-0578 C DRNG 11833 142NDAVE SE WATER PONDING IN YARD 626J6 1991-0797 51 STUDY 15630 SE 124TH ST BECK 627A7 1991-0797 S2 ON HOLD 627M> 1991-0898 C DRAINAGE 15212 SE RE;NTON-ISSAQ RD HIGHWAY DITCH CLEANING 627A8 1991-0932 C DIVERSIO 15630 SE 116TH ST DITCH OUTLET ON YARD 627M 1992-0100 C DRAINAGE 12240 142ND AVE SE 626J6 1993-0387 NDA DRNG 12203 148THAVE SE PONDING IN YARD NDA-F 627A6 1993-0387 RN DRNG 12203 148TH AVE SE PONDING IN YARD NDA-F 627A6 1993-0437 C DRAINAGE 11204 148TH AVENue SE ENCLOSING ROADSIDE DITCH 627A6 1994-0213 WQC DUMPING 11800 14STHAVE 5E CONTACT HEALTH FOR SPECIFIC LOCATI 627A7 . 1994-1000 C FLOODING 11615 14BTH AVE SE LACK OF CONVEYANCE THROUGH PVT P 627A7 1994-1000 NDA FLOODING 11615 148TH AVE SE LACK OF CONVEYANCE THROUGH PVT P 627A7 1994-1000 RN FLOODING 11615 148TH AVE 5E LACK OF CONVEYANCE THROUGH PVT P 627A7 1995-0009 C EROSION 14701 SE 116TH ST ADJACENT RN OFFSITE FLOW INADEQ. D 627A7 1995·0104 C H20LEVEL 12050 14BTH AVE SE GROUNDWATER IMPACT PVT PROPERTY 627A7 1995·0689 C EROSION 11204 148THAVE SE SLOUGHING OF ROADSIDE DITCH 627A6 1995-1037 C DITCHES 11224 146TH AVE SE STORM EXCEEDED SYSTEM CAPACITY 627A6 tI·0143 C RUNOFF 14614 5E RENTON·ISSAQUAH RD RUNOFF FROM SR 900 626J6 6·0157 C DIGGING 12227 146THAVE SE EXC IN WETLAND 626J7 1996·0165 C FLOG 11625 148THAVE SE WATER MISSES CB. PIPE DAMAGE 626J7 1996·0323 C WETLAND 12227 14BTH AVE SE SAME AS 96-0157 6Z7A7 1996·0552 C FLOG 11615 148TH AVE SE 626J6 1996·0552 R FLOG 11615 146TH AVE SE FLOODING FROM VANDALIZED FIRE HYO 626J6 1996·1193 C EROSION 11204 148TH Ave SE REQUEST TO ENCLOSE RlS DITCH 627A6 1996-1284 C EROSION 12257 156TH AVE SE EROSION ALONG ROAD SHOULDER 627A7 1996·1771 C RUNOFF 12227 146TH AVE SE ADJACENT PROPERTY IMPACTS FILLING7 626J7 1999·0151 C DRAINAGE 11624 142ND AVE SE INTERMITTEN STREAM CHANNELIZE INF 626J7 1999·0334 C DRAINAGE 51' 120·124@ 156TH SE QUEST RE'DRAINAGE EASEMENT & HIST 627A7 1999·0417 C FILLING 15019 SE MAYVALLEYRD ALLEGED FILLING VIOLATION PREVIOUS 627A6 1999-0725 wac CREEK 14B13 SE RENTON·ISS RD CONCERNS REGARDING SEDIMENT ORAl 627A6 2000·0473 C DDM 11600 148TH AVE SE ADJACENT PROPERTY GRADED AND GRA 627A7 2000-0528 FCC MMG 11640 148TH Ave SE COMMERCIAL PROPERTY CHANGED TO 627,1.7 2000·0760 waR waB 11204 148TH AVENUE SE Mrs. Waltrip has mulched all exposed soil to s 626J6 2001·0027 C DDM 11800 14BTH AVE SE HISTORIC DRAINAGE PROBLEM. PREVIO 627A7 • Page 2 of2 '_~141ll couGitR 1I0UNTAlN PARK 36 ---~I-I~--------I-.- 16 ;;""' .... :lIt .. '. 'fi:::~ . '1J+ts ~''-'DRAINAGE COMPLAINTS LIST EXHIBIT I ----------------------------- • SECTION IV: FLOW CONTROL AND WATER QUALITY • • This section summarizes the specific existing and developed basin characteristic used in determining the volume and type of flow control and water quality mitigation designed for this site. This section will be completed with the Civil Drawings. TRIAD ASSOCIATES DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE IV-I ,------------------~---------------~ • SECTION V: CONVEYANCE SYSTEM DESIGN • • All conveyance systems will be designed, in accordance with the 1998 King County Surface Water Design Manual (KCSWDM). All systems are analyzed during the 100- year design storm event to show no flooding occurring at any point where it could damage public or private property. This section will be completed with the Civil Drawings. TRIA /) ASSOCIA rES DRAINAGE REPORT FOR CAMWl::ST, EAST RENTON PAGE V-I • SECTION VI: SPECIAL REPORTS AND STUDIES • • MINOR FLOODPLAIN ANALYSIS A minor floodplain analysis was done per section 4.4.2.1 of the 1998 King County Surface Water Design Manual. The floodplain was assumed to be 452.00, which is 2-feet above the highest elevation of the delineated wetland. The proposed buildings adjacent to the wetland will all have finished floors well above elevation 452.00. '~'-'~ -TRiAD~A-S-SO-c'-IA-r--'£-s--'---~5RA-/!I-'I-1 Co-'£-R-E--P""O--R--:r-:F-=O-R-C-A-MWI:."ST, EAST RENTON PAGE VI-J • • • SECTION VIII: EROSION AND SEDIMENT CONTROL The temporary erosion and sedimentation control plan is designed to reduce the discharge of sediment-laden runoff from the site. The plan is comprised of temporary measures (rock construction entrance, filter fence, etc.) as well as permanent measures (hydroseeding, etc.). This section will be completed with the Civil Drawings . 'I TRIA D ASSOCiA TES --.~~---- DRAINAGE REPORT FOR CAMWEST, EAST RENTON PAGE VIII-I • SECTION IX: BOND QUANTITIES, ETC. • • BOND QUANTITY WORKSHEET This section will be completed with the Civil Drawings. FACILITY SUMMARY This section will be completed with the Civil Drawings. DECLARATION OF COVENANT This section will be completed with the Civil Drawings. TIl/AD ASSOCIATES DRAINAGE REPORT FOR CAM WEST, EAST RENTON PAGE IX-I • SECTION X: OPERATIONS AND MAINTENANCE This section will be completed with the Civil Drawings. • • I I I I I I I I I I I I I I I I I I 'I Camwest -E. Renton King County, Washington Levell Drainage Analysis Prepared by: GeoffE. Tamble, P.E. Rebecca Cushman, P.E. Reviewed by: Todd A. Oberg, P.E. TRIAD ASSOCIATES September 19, 2002 RE\j\S\ON RECEIVE,!) SEP 27 2002 KING COUNIY LAND USE SERVIC lo '\~ MAIN FILE COpy Triad Job No. 01-047 I I I I I I I I I I I I I I I I I I I Camwest -E. Renton King County, Washington , Level 1 Drainage Analysis Prepared by: GeoffE. Tamble, P.E. Rebecca Cushman, P .E. Reviewed by: Todd A. Oberg, P.E. TRIAD ASSOCIATES September 19, 2002 I EXPIRES 5/28/0":5 =-:::J '\l\~lO2- Triad Job No. 01-047 I I I I I I I I I I I I I I I I I I I ~ --~-------- TABLE OF CONTENTS PROJECT OVERVIEW .............................................................................................................................. 2 GENERAL DESCRlPTION OF PROPOSAL ........................................................................................................ 2 PREDEVELOPED CONDITION OF SITE .............. ~ ............................................................................................ 2 DEVELOPED CONDITION OF SITE ....... ~ .................................................................... ~ .................................... 3 .OFFSITE STORM WATER RUNOFF ........... ~ ....... ~ ............................................................................................ 3 Vicinity Map .................... ~.~ .... ~~ ......................... ~. ..................... ~~~~.......................... ...4 DRAINAGE BASIN, SUBBASINS AND SITE CHARACTERlSTICS ................... ~ ....... ~~ .................................. ~~~ .. 5 OFF-SITE ANALySIS ................................................................................................................................. 6 STUDY AREA .............................................................................................................................................. 6 TASK 1, STUDY AREA DEFINITION AND MAPS ..................................... ~~~~ .................................................. 6 Onsite Basin .............. .. ... ~ ................ ~~ ...... 6 Upstream Basin........ ............... .............. . ....... 6 TASK 2, RESOURCE REViEW ....................................................................................................................... 7 TASK 3, FIELD INSPECTION ............................................................................... ~.~ ................................. ~ ..... 8 TASK 4, DRAINAGE SYSTEM AND PROBLEM DESCRlPTION .......... , ................... ~ .. ~ ................................. ~ .... 8 TASK 5, MITIGATION OF EXISTING AND POTENTIAL PROBLEMS ................................................................. 9 TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST, EAST RENTON PAGEl I I I I I I I I I I I I I I I I I I I PROJECT OVERVIEW This section gives an overview of the project site both pre-developed and developed. There is also a description of the runoff characteristic of the property and the existing soil classification. The proposed project consist of a Single Family Residential Development for 66-lots in a R-6 zone. The site consists of two existing lots that total approximately 19.6± acres, with approximately 8.2± acres of sensitive areas to remain undeveloped that include a wetland and a hawk's nest (Please Reference Preliminary Exhibit in Appendix). The project is located west of the intersection of 148 th Ave SE and SE 1 20 th St. in King County; Section 10, Township 23 north, Range 5 east, W.M., Washington State. GENERAL DESCRIPTION OF PROPOSAL In general, this project will replace one existing single-family home, a shop, a small covered storage building, and a gravel driveway with 66 single-family lots. Part of the major site improvements will include the installation of neighborhood access streets (sub- collector, sub access, and minor access). 148 th Ave SE will be improved with full half . street improvements as required by the King County conditions of approval (To be detennined). All runoff from the site and most of the runoff from the frontage will be collected in the proposed conveyance system and directed to the proposed detention/water quality facility located along the northern boundary of the site. Please see "Preliminary Plan Map", in the Appendix of Section III, for a general description of the proposed improvements. The dimensions of the ·proposed lots and roadways will require wetland filling and buffer averaging on the western portion of the site. PREDEVELOPED CONDITION OF SITE The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. (Please reference the "Existing Conditions Exhibit" for locations of each structure). TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST. EAST RENTON PAGE 2 I I I I I I I I "'I I I I , I I I I I I The site has one drainage basin that generally drains towards the northwest within the property and then flows to the north through Honey Dew (Honey) Creek. A wetland occupies the western portion of the site. Overall, the site slopes from east to west at approximately 5-15%. The site generally slopes from 148 th Ave SE down to the west towards Honey Dew Creek. DEVELOPED CONDITION OF SITE The developed site improvements will be located on the eastern 11.4± acres of the property. The preliminary plans are showing 66 single-family lots with subcollector, sub- access and minor access roadway improvements. 148 th Ave SE will be improved with full half street improvements as required by the King County conditions of approval (To be determined). Sections of the wetland that need to be filled for the project will be restored or compensated for as directed by King County. The detention/water quality facility will be designed to meet the Level I Detention Standards and the Basic Water Quality Menu from the 1998 King County Surface Water Design Manual. OFFSITE STORMWATER RUNOFF Flows entering the site from the east come from the west half of 148th Ave SE. Runoff entering the site from the west and south adjacent to the wetland is collected in the wetland area. The wetland area will remain undeveloped. Runoff generally does not enter the site along the north and south property lines near the proposed lots since the site slopes from east to west. TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST, EAST RENTON PAGE 3 r I I I I I I I Vicinity Map NTS TRIAD ASSOCIATES -DRAINAGE REPORT FOR CAMWEST, EAST RENTON PA(;F 1-3 I I I I I I I I I I I I I I I I I I I DRAINAGE BASIN, SUBBASINS AND SITE CHARACTERISTICS The existing site one drainage basin that drains into Honey Dew (Honey) Creek, which, according to the December 1990 King County Sensitive Areas Map Folio, is an unclassified stream in the May Creek Sub-Basin. Honey Dew Creek combines with May Creek over two miles downstream (north) of the site. May Creek is in the Cedar River Drainage basin and ultimately discharges into Lake Washington. The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. According to the King County Soil Survey, the site is underlain with Alderwood soils belonging to the S.C.S. type 'c' hydrologic group or 'Till Soils'. Onsite topography is mild to moderate, sloping to the west at approximately 5% to 15%. Please refer to the Soils Map, as well as the Existing Conditions Map, located in the appendix of this report. Note: The 1990 King County Wetland Inventory did not list the wetland on this property. The 1987 Basin Reconnaissance Program did not list Honey Dew (Honey) Creek in any of its basin reconnaissance data. TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST, EAST RENTON PAGES I I I I =:":'ir="lI'=~eF"""'" : I I I I I ~~~c===b,~~rr""" -.: I I I I I .. " ~I/ " . , . " • • Age Py AkF Age I I I GUIDE TO MAPPING UNITS FOT a full description of a mapping Wlit, read both the description of the mapping lUlit 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: Map Acreage and extent, table 1, page 9. Engineering uses of the soils, tables 2 and 3, pages 36 through SS. Town and country planning, table 4, page 57. Recreational uses, table 5, page 64. Estimated yields, table 7. page 79. Woodland Described Capabi Ii ty tmit group I synbol Mapping unit .. AgB_Alderwood gravelly sandy loam, 0 to 6 percent slopes---------- "AgC-Alderwood gravelly sandy loam, 6 to IS percent slopes--------- on page 10 8 10 10 10 10 II II 12 12 12 13 13 14 14 IS IS 16 16 Symbol IVe-2 Page SyJIi>ol 76 3d2 I A-gD Alderwood gravelly sandy loam, 15 to 30 percent slopes-------- AkF Alderwood and Kitsap soils, vel}' steep------------------------ AmB Arents. Alderwood material, 0 to 6 percent slopes !!--------~- AmC An I BeC Ben BeF Bh I Br Bu Cb Ea I Ed EvB EvC EvD I EwC InA InC T., T) I 'pc KpD KsC I Ma NeC Ng Nk I No Or Os OVC OvD I OvF Pc PI< Pu I Py RaC RaD RdC I RdE I I I I 'Arents, Alderwood material, 6 to IS percent slopes 1/--------- Arents Everett material 1/------------------------~--------- Beausi{e gravelly sandy loam, 6 to 15 pe~cent slopes---------- Beausite gravelly sandy loam, IS to 30 percent slopes--------- Beausite gravelly sandy loam, 40 to 7S percent slopes--------- Bell ingharn silt loarn---"--------------------------------------- Briscot silt loam--------------------------------------------- Budd ey si 1 t loarn--------------------------------------------- Coastal beaches----------------------------------------------- Earlmont silt loam-------------------------------------------- Edgewick fine sandy loam-------------------------------------- Everett gravelly sandy loam, 0 to 5 percent slopes------------ Everett gravelly sandy loam, S to 15 percent slopes----------- Everett gravelly sandy loam, IS to 30 percent slopes---------- 'Everett-Alderwood gravelly sandy loarns, 6 to 15 percent slopes------------------------------------------------------ Indianola loamy fine sand, 0 to 4 percent slopes-------------- Indianola loamy fine sand, 4 to 15 percent slopes------------- IndianOla loamy fine sand, 15 to 30 percent slopes------------ Kitsap silt loam, 2 to 8 percent slopes----------------------- Kitsap silt loam. 8 to IS percent slopes---------------------- Kitsap silt loam, ]S to 30 percent slopes----~--------------- Klaus gravelly loamy sand, 6 to 15 percent slopes------------- J'.ti xed all uvi al 1 and--------------------------~~--------------- Neilton very gravelly loamy sand, 2 to 15 percent slopes------ Newberg silt loam--------------------------------------------- Nooks ack si It loam-------------'--------------------- - --------- Norma sandy loam---------------------------------------------- Orcas peat---------------------------------------------------- OTidia silt loam---------------------------------------------- Ovall gravelly loam, 0 to IS percent slopes------------------- Ovall gravelly loam, 15 to 25 percent slopes------------------ Ovall gravelly loam, 40 to 75 percent slopes------------------ Pilcl1uck loamy fine sand-------------------------------------- Pilchuck fine sandy loam-------------------------------------- Puget silty clay Joam----------------------------------------- Puyallup fine sandy loam-------------------------------------- Ragnar fine sandy loam, 6 to 15 percent slopes---------------- Ragnar fine sandy loam, IS to 2S percent slopes--------------- Ragnar-Indianola association, sloping: 1/---------------------- Ragnar soil-----------------------~--------------------- Indianola soil------------------------------------------- Ragnar-Indianola association. moderately steep: 1/------------ Ragnar soil--------------------------------~------------ Indianola scil------------------------------------------- 16 17 16 17 17 18 18 18 18 19 19 20 20 21 21 22 23 23 23 23 24 24 2S 26 26 26 IVe-2 76 3dl Vle-2 78 3dl VIIe-l 78 2dl IVe-2 76 3d2 IVe-2 76 3d2 IVs-l 77 3£3 IVe-2 76 3d2 Vle-2 78 3dl VII e-l 78 3dl IIlw-2 76 3w2 Ilw-2 7S 3wl HIw-2 76 4wl VIIIw-l 78 11w-2 7S 3w2 l1Iw-l 7S 201 IVs-I 77 3£3 Vls-1 78 3£3 VI e-l 77 3f2 VIs-l 78 3f3 IVs-2 77 4s3 IVs-2 77 4s3 VI e-l 76 452 IJle-1 7S 2d2 IVe-1 76 ?d2 Vle-2 78 2dl VIs-l 78 3fl Vlw-2 78 201 Vls-I 78 3f3 JIw-l 74 201 IJw-l 74 201 II Iw-3 76 3w2 V111w-l 78 IJw-2 75 3wl IVe-2 76 3dl VIe-2 78 3dl VIIe-1 78 3dl VIw-l 78 2s1 IVw-l 76 2s1 IIlw-2 76 3w2 IIw-l 74 201 IVe-3 77 4s I VI e-2 78 451 -------- IVe-3 77 451 IVs-2 77 4s3 -------- Vle-2 78 451 VI e-l 77 452 U, s. GOVERI'IMENT PRINTING OFFICE: n73 0 -468_266 I I I I I I I I I I I I I I I I I I I 3.2.2 KCRTSfRUNOFF FILES METHOD-GENERATING TIME SERIES TABLE 3.2.2.B EQUIVALENCE nEnVEEN SCS SOIL TYPES AND KCRTS SOIL TYPES SCS Soil Type SCS KCRTS Soil Notes Hydrologic Group Soil Group Alderwood (AgB, AgC, AgD) C Till Arents, Alderwood Material (AmB, AmC) C Till Arents, Everett Material (An) B Outwash 1 Beausite (BeC, BeD, BeF) C Till 2 Bellingham (Bh) D Till 3 Briscot (Br) D Till 3 Buckley (Bu) D Till 4 Earlmont (Ea) D Till 3 Edgewick (Ed) C Till 3 Everett (EvB, EvC, EvD, EwC) AlB Outwash 1 Indianola (InC; InA, InD) A Outwash 1 Kitsap (KpB, KpC, KpD) C Till Klaus (KsC) C Outwash 1 Neillon (NeG) A Outwash 1 Newberg (Ng) B Till 3 Nooksack (Nk) C Till 3 Norma (No) D Till 3 Orcas (Or) D Wetland Oridia (Os) D Till 3 Ovall (OvC, OvD, OvF) C Till 2 Pilchuek (Pc) e Till 3 Puget (Pu) D Till 3 Puyallup (Py) B Till 3 Ragnar(RaC, RaD,Rae,RaE) B Outwash 1 Renton (Re) D Till 3 Salal (Sa) C Till 3 Sammamish (Sh) D Till 3 SeaN Ie (Sk) D Wetland Shalear (Sm) D Till 3 Si (Sn) e Till 3 Snohomish (So, Sr) D Till 3 Sultan (Su) e Till 3 Tukwila (Tu) D Till 3 Woodinville (Wo) D Till 3 Notes: 1. Where outwash soils are saturated or underlain at shallow depth «5Ieet) by glacial till, they should be treated as till soils. 2. These are bedrock soils, but calibration of HSPF by King County DNR shows bedrock soils to have similar hydrologic response to till soils. 3. These are alluvial soils, some of which are underlain by glacial tillar have a seasonally high water table. In the absence of detailed study, these soils should be treated as till soils. 4. Buckley soils are formed on the low-permeability Osceola mudllow. Hydrologic response is assumed to be similar to that of till soils. 1998 Surface Water Design Manual 911/98 3-25 ------------------------------------- I I I I I I I I I I I I I I I I I I I OFF-SITE ANALYSIS This section outlines the drainage basin, which this project is located, highlighting the downstream conditions one mile from the project site. STUDY AREA TASK 1, STUDY AREA DEFINITION AND MAPS This site is located within the May Creek Sub-Basin of the Cedar River Basin. On site Basin The site contains an existing house, a shop, a small covered storage building, and a gravel driveway. The remainder of the site is covered with a mixture of pasture, blackberries, and trees. Most of the trees are located in the western half of the site with the pasture area occupying the eastern portion. The blackberries are located throughout the property. According to the King County Soil Survey, the site is underlain with Alderwood soils belonging to the S.C.S. type 'C' hydrologic group or 'Till Soils'. Onsite topography is mild to moderate, sloping to the west at approximately 5% to 15%. Please refer to the Soils Map in the Appendix of Section I. as well as the Existing Conditions Map located in the Appendix of this section. Upstream Basin Approximately half of 14Sth Ave SE along the entire site frontage currently sheet flows into the site. Flows from the frontage improvements will be collected and conveyed to the proposed detention/water quality facility. The area where flows enter the site from the south and west adjacent to the wetland will remain undeveloped. TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST, EAST RENTON PAGE 6 ,..-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-------------------------- I I I I I I I I I I I I I I I I I I I TASK 2, RESOURCE REVIEW "1998 King County Surface Water Design Manual" "1990 King County Sensitive Areas Map Folio" "1973 King County Soil Survey" "King County Water and Land Resources (WLR) Division Drainage Complaints" According to the King County Drainage Complaint List, only three complaints have been documented near the property and the downstream drainage course. The complaints are over 12 years old and any documented follow up to each complaint has been archived. King County suggests not following up on any complaints before 1990 due to their age, development that has occurred, etc. Additionally, no complaints have been documented at those addresses for 12 years, so the problem most likely has been corrected. The complaints are linked to a private home drainage system and a private road washout due to no drainage system rather than flooding, or erosion of the large drainage course that our site will discharge to. TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMWEST, EAST RENTON PAGE 7 I I I I I I I I I I I I I I I I I I I TASK 3, FIELD INSPECTION "Triad Associates" did a field visit on 4/03/01 to locate any potential problems upstream or downstream of the proposed development. The weather was overcast and approximately 55 degrees with small amounts of runoff in the drainage systems from the previous day's rainfall. Drainage leaving this property is collected in an existing wetland (A) and conveyed off site to the north through two 12" CMP culverts (B I & B2). The onsite wetland has a slight ridge separating the wetland on the north property line of the site. The runoff that leaves the through the two 12" CMP culverts combines in a drainage ditch adjacent to the north property line (C). Drainage also leaves the site on the north east side (C2) then drains west and intersects with the drainage from CI. From here the runoff flows to the north through a natural drainage course called Honey Dew (Honey) Creek (D) for about 500' before entering a 24" CMP private driveway culvert (E). . The property owner adjacent to the culvert stated that it has only flooded once, around 15-years ago, when a neighbor downstream of their property dammed up the creek to make a waterfall. The waterfall has been removed and the culvert has not flooded since that time. From this culvert, the natural drainage course continues to the north in a well-defined channel with heavy ground cover (F). The final observation of the downstream investigation was approximately 2000' downstream of the site (G). No evidence of flooding or major erosion was observed along the downstream drainage course during the site visit. From the last observed point in Honey Dew (Honey) Creek (G), runoff continues north then west before combining with May Creek and eventually reaching Lake Washington about 6 miles to the West. See the "Downstream Drainage Exhibit" at the end of this section for a complete definition of the Study Area. TASK 4, DRAINAGE SYSTEM AND PROBLEM DESCRIPTION There were no apparent problems downstream of this project. TRIAD ASSOCIATES -LEVEL I REPORT FOR CAMIVEST, EAST RENTON PAGES I I I I I I I I I I I I I I I I I I I TASK 5, MITIGATION OF EXISTING AND POTENTIAL PROBLEMS The developed site runoff will be detained to. the Level 2 standard as outlined in the King County Surface Water Design Manual -1998. The KCRTS Level 2 detention standard requires maintaining the durations of high flows at their pre-development levels for all flows greater than on-half of the 2-year peak flow up to the 50-year peak flow. The pre- development peak flow rates for the 2-year and 10-year runoff events are also intended to be maintained. The site is proposing using one detention system. The detention facility release rates will be based on the existing runoff from the area of the site that is being developed: The wetland area and associated buffers will remain undeveloped. TRIAD ASSOCIATES -LEVEL J REPORT FOR CAM WEST, hAST RENTON PAGE 9 ----------- - I ... ,.j .... I , ~, d· I .I II III I :n I I I " , \ \ ~ I " I - "" -: ) ~. 1) ~: . " - "",I.t \ \' '; J1 \ c, - • ! 1 j .I - . --.. ~ ii ... , \ If, .... I', I '!" !, 'y " I I, " III :! 'J! I,I} " " 'il~; :', --' ... "," ' .. '" ,.' ' i( .... -~, H Ii l. • ; I .:. ~ .: ~ j -- - -- en z -~ N !Xl W i ~ ~ z -~ c l: A~ ,r~ '" (I , ... Ai :,\ • , ~.~ II _"i' ~ ~ (\3 "0 (\3 c: "0 ::l c: S ::l S c: ~ c: 'iii ... ~ 0 .c .~ ttl ::l ::E C/) I hr· .. ·-'-"-. ~l' '. '-. "-:..\... i , , ': ,.~' '";. ! I j, \ 1') : /,.-:::'- " ~ . ~. - "pi,,' t' I}' I, i,l, ;""'/~ i',I, .., ',-.,,' t: •• ~I "":' ",~. b -/' .' ,I " .;.' " -" " :;". 'J '. h, /:' " r-r .. ' . i)"~ / 1/', ~ , iI " ~ ~"'i:".' L ..... i - -- - • • ~ «~ :~ ~ .-co. 00. "'. ,..'" §f 8.! ~~ ~.~f ,''0 8 ... "i h , .l~· .' -( " \ -- ./ / j' i :) II ,-" " - f ~ .. ~ ~ '" • ~ N 0 I ,', \ .. I .. / - ~ ~ 0 0 0 0 0 ~ - -- --- - - -- - - - -- - - - - -- - - -- - - - - ---- - , / - I I o '''' " . • ".:'.J"-r? M --1 ,-"0_ ~l "j ..... ~ " . ~ " - • • • • • I - - ------ - - -- - - - ---- - ---- - - - --- - --- - - -- - - , / .J' - .-...;\ "" r" UIJ'\ o -- - - -- - --- -- - - -- - --- - -- -- - - - - --- -- - - - -- - ----- - -- - - -------- Basin: Cedar River Symbol Drainage Component Type Name, Size Type: sheet, swale. see map stream. channel, pipe, pond; Size: diameter, surface area C1 Honey Dew (Honey) Creek C2 sheet flow D Honey Dew (Honey) Creek E 24" CMP Culvert F -G Honey Dew (Honey) Creek OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Surface Water Design Manual, Core Requirement #2 Subbasin Name: May Creek ---- Drainage Component Slope Distance Existing Potential Description from site Problems Problems discharge constrictions, under capacity,.ponding drainage basin, vegetation, % 114 mi, 1320 ft overtopping, flooding,habitat or organism cover, depth, typ~ of sensitive destruction, scouring. bank sloughing, area, volume sedimentation, incision, other erosion 3·4' wide drainage-channel 0.5% 10ft None None pasture 5-15% .14 mile none none 3-4' wide drainage channel 0.5% 480 ft None None 2-3' of cover under driveway 0.5% 500 ft None None 3-12' wide drainage channel 0.5% 500·2000 ft None None . Triad Associates Subbasin Number: ------ Observations of field inspector resource reviewer, or resident tributary area, likelihood of problem, overflow pathways, potential impacts. unobstructed natural and man altered drainage channel erosion unobstructed natural and man altered drainage channel if culvert overflows, it will cause no damage to private structures broad drainage channel with heavy vegetation on both sides of channel - ------------ - ------;;f! -C-=-'-==':::-C--'-_~l_C==:. ~;) \ "'_. R ENTON E~ \O-23-~ ~_~~1~ _._ 60 . l. eMS 'P B P ..... -PN--,0 1 " :SMT.' 1:1 --.. --... -----... ---. -.' . '0 lO']O 1 _ ~ o.\4~D"O I' if>..... IIl<1ll/lt) , ~;;"!mJ John Hansen 2.86Ac. ~ _""._-'c .. ·'.I.l ", "HI I ~' Ac. 'J, ... ..----.. --------.---. -_~ ~ Gil _ ... I~ Will E Broyles 19111(, 20. . .. \ (57) .\ c"'1EI ~UC "'16 _ @i '_ .. __ .... >-:.: \ ®" ~ _::: liZ§] ~'I.I ~~ _:0. George: C DavIs 2 18Ac ~ @-:II ______ ··_· ______ ·_· ___ ·· ____ ·_®;;lveeMh"hc,t..@ -n:" "n.' ~ t Cltl zen Fed. S.& L. Assn ~2J183 ~I~ t-hlkc Hayer ~'.'/)Ac.] \ {J~'205. /1 ~ @l ~ @f I 2 ) II IB" '" 2\ -----5~14~ _ .. , ____ . .;(\0 ,S,P. 688009 l<J~. O.-'G Ac ~ ': '.:'\~; FrdlICI'S p. Brown 477 Ac ~t F .@"'E](if QZC) :..; ~ ------.-1031,11 25:"./\ ' .. • _ ,', ,.-, 1292. ;J7 o ~l ""0 t: Stanle'j J. Peter5en 4.% Ac. ~ 00 u.i i ___ ® , ~ Oil .' , ui ----.. ---.--------~ -CJ 8 w :.: 1 . ( ~ SR ",,00. R 4<l "0 ~ '" ~ IJl 0Oi'l::.·:.1 -%-r167 Ac., cf.5b Ac ~Il 'e' '::'1 ~ Henr'j IJro 4.77 Ac. ~I~ Lionel Lesh ..... ~ ;' ·~:s . @) ~:,@ \ ~"', w ~I::: . 'I "0 15':\ ~ > ~ (I l£ #. :. @,-<l:1",,0 1 ' -iEJ" O?,~,~C ~ lJ. 60 'I L!!:ri :!;:, _ ® ; _ . _ . _. _@ '''' @l <;I 12!!3.~ .)oj "{(~J ;. <lTI. F~"''' 661. 69 6)1.65 ""<t1 5 ;',1 c'~OAc ~'~ K i1 l1H: i'. John M.Pollock s ~'eck5trol11 5 Ac :;1 ::I ~ f- ~ 0: <:: @ I S.34 Ac. 1.' 24" CMP CULVERT I~ 1,08 iii ~ I i ~ .. 0 .. ' 1 ·····'1 ". (I: :\' JI: o .~:;" T. $ SP 778111 ()!' 1 121 III $ I )00.,. llO" ® ~o , ,)"8 !(' C2 ,")1: ". Iii, I C1 :t ................ ~ I 12" CMP CULVERT 1 12" CMP CULVERT ~ [}2J (3),.~ 1f/3J J I ,,-:,. . . + ~,!,)l>i ," •..• B' '1'('1 .;. .'. ........: ~ I . l.'~> .. !l.. . .. ) ',,' ! ':'\ •••• ::.' ••••• ' .' • i ;i;: ~ . _ " !? I .' " ," .': I, " ",~", / ! ,(): I,,> <:> : I; ti!-:)ii,,:':' """'!;!"/':":" ,:j.:';" ., .. _ ':,"'"v /).' I~ ~ . '" N :,' , .. ' .... \: :;:.......// ... \; ,~, . ",.I.' " -..... ~ ....... '"'' / / 'i': i WET. LAND AREA ... / .. ..., \~ '8 «Cl ~ i,94JL:.J @ '" 'Ie A '/··A ( / l~ " ! I I! •... 118,,0 ~ N 1"-200' '\. , ..... \", \ \.., ". "" . ".--_.. \1' I I \ .. -.,,, .• ~: I, CD )T 150 :;; 110IS 4r7lc. ~ t::.J® 1 ~o O..l~ .'0 '. '~~>V' )" .. " ,,' ~~, ;'I\~" 140 .' ~ 12024 ~:5'''' \ /4 '1.5 'SO Il()SJ i 04[GC~ ." \ ~ .rD'4 Ac. ',;. ",\\'. ;... , 0-0 rMi\ It\1"l\" . .' ~h -~:!) Chas. H Moore ; 5<; Ac ~r'· .. .";;~'-··~·'.;,.-...;...;.· .. : ..... __ .. ..;:<-:...> .. .:.)_'.;.'.~~.,I'l'.l . .J.~_~.;::.;;.:;;.;~~~,w;~;!.~~~..;;....;;,.,;..w..!.t;f::~~;;:~ '",... , N· '" @} g ~ 04S Ac !~ Oonald R. Larsen . 4.30 Ac. G'r" .. 1 'so '1 Q. lID, >i ... ; ,~ 8 6 ~ ,oT.' . $ 1f 140 632.01 4 '32,01 12~41:\ __________ , ___ ~ __ ._. ___ .. " __ •• ,, (,:V 75 .' 15 tt 0J~ . [ii:i!f.. ~I" ::: S' ...... __ If> \0: 8 ... ~;:t: $ ;:l 0 --® @> '~r-= \I,lnr~ W ('I-ihhlf> ~t 11')( 7 ,q nr ~I~ Henry W Owe!ls 3.93 Ac @PI' ,0 I!.v .111(1 DOWNSTREAM DRAINAGE EXHIBIT (¥ I. ,-------------------------------------------------------------------- fI) UI ~ m 8gHIJhfi ~ l~]]f! f ~.E .!I il. "I I!: ;! ;E~ -~- - -- NOlDNIHS I'M ')"lNnOa DNI){ " ~ lStt3 lS3Mwtta N01N31:J I. I ~ I i ! 1/8/HXiI SNO/.J./ONOO DNUS/XiI ~J AB NOI~jA'i~ llya 'ON i i i h~ "'''":."",. , , c. - - - ""., \ \ \ \ \ ) I I , \ - . "'" . , ,·---------..1 ... -.---'-'-- ,." ... ",.,. ""'" -_. -------.-.~ -- . " ........ _-- .... -·----·-· .. ---------·~ .. ·---I------, .". ~fI> ...... ........ " .. ------------------- "-e ~ ,.. ~: 0 ,.! , -. -, ~~ 0 1 ~~ I~ "~ ~ I" "'. 10 i~ ,., 1"1 1-'" , 09. <>. '" , ~ .. ... --- - -------_ .. ---------.- 1 KinO cOimty Water and Land Rosourco8 DIVISIon -Dral1l808 Survlco8 Soctlon 1 Complalllt Suarch Prinled: 4/4/012:10:42 PM •• ,lIplalnt ~~: Type or ProblBm Addros8 or Problem CommBnIB Thros P3llB 1 NumbHI' 1975-0004 C DRNG 958 S UNSET BL SE 138TH/SUNSET BUANNEXED 626J6 1 1982-0033 C FLOG 12424 155TH AVE SE & DRNG CAUSED BY FILL 627A7 1982-0034 C 12404 . 155THAVE SE LANDFILL 627A7 1983-0046 C DRNG 11203 148TH AVE SE PONDING 626J6 1 1983-0049 C FLDG 15630 SE 124TH ST 627A7 1984-0015 C FLOG RENTON-ISSA HWY MAY CREEK 626J6 1986-0304 C PONDING 13612 SE 121ST ST 628J7 1 1986-0654 C FILLING 11203 148TH AVE SE 626J6 1986-0707 C FLDG 13837 SE 128TH ST 626J7 1 1987-0284 CL FLOG 14847 206THAVE SE BASEMENT FROM CULVERT -CL#1050S 627A6 1987-0382 C FLOG 11822 148TH AVE SE CLEARING AND GRADING 626J7 1987-0485 C DRNG 15004 SE 114TH ST NEIGHBOR FLOODING PROPERTY 627A6 1 1987-0485 ER TO RD DRNG FOR CM/RD COORD 10/27/87 627A6 1987-0485 NDA NO RD ORNG FOR CM/RD COORD 10/27/8 627A6 1987-0787 C DRNG 12808 138THAVE SE 86-03A4,87-0445,0707/ FILLING OF LOT 626J7 1 ·1988-0369 C DRNG 12003 138TH PL SE FROM CONSTRUCTION-RUNOFF 626J7 1988-0369 NDA DRAINAGE OHLO/SWM DIV-Pl Y.(NEW CONST). 626J7 1988-0713 C DRNG 14000 SE 128TH ST FILL OBSTRUCTION OF DITCH 626J7 1 :-0713 ER FILL 14000 SE 128TH ST (CEMTY RD).TO BALD-TSS CM 09/05/89. 626J7 1988-0713 NDA FILL (CEMTY RD).TO BALD-TS/PROB CRTD 626J7 1 1988-0787 C DRNG 15004 SE 114TH ST ILLEGAL INSTALLATION OF TILE 67-0485 627A6 1988-0790 C • DRNG 14418 SE 1 16TH ST INADEQUATE SYSTEM INSTALLED 626J6 1989-0084 C ORNG 11833 142ND AVE SE POND OVERFLOWING ONTO YARD 626J7 1 1989-0140 C • EROSION 14429 SE 116TH ST PVT RD WASHOUT DUE TO NO DRAINAGE 626J6 1989-0150 C • ORNG/ERO 14428 SE 116TH ST PVT RD WASHOUT DUE TO NO DRNG 89-0 626J6 1989-0318 E DRNG 11800 138TH AVE SE CLEARINGOF R/O NATURAL RID POND 626J6 I 1989-0534 C ORNG 14842 SE 114TH ST FILL OF DRAINAGE 87-0485 627A6 1989-0776 C FLOG 11644 142ND AVE SE FILLING OF LOT BEHIND/FLOODED CRAW 626J7 1969·0818 C DRNG 12266 155TH AVE' SE BSMT FLDGIWATER BACKING UP 627A7 11990-0226 C DRNG 14607 SE 12BTH ST . SHOULDER EROSION ON CONST SITE/ST 626J7 1990-0508 C DRNG 14842 SE 114TH ST DITCH FILLED IN 627A6 11990-0712 CL FLOG 12266 155TH AVE SE CL#12965 627A7 1990-09B2 C DRNG 15630 SE 116TH ST DITCH ENDS BY PROPERTY 627A6 1990-1097 C DRNG . 15630 SE 124TH ST CLEARING OF LARGE PROPERTY 627A7 1 1990-1184 C FLDG 14306 144TH AVE SE DICKSON/CLEARING FOR PLAT 627A7 1990-1464 C DRNG 12413 142NDAVE SE PLUGGED CULVERT BY ROAD 626J7 1990-1623 C FLDG 13611 SE 116TH ST @ R/D FACILITY SEEPING WATER 626J6 1 Pogo 1 of 2 1 1 I complaint Typo Typo of Problom Addross Dr Problam Climmslll8 Tbros PaDl NumbOJ' Coda I ,n~1-0216 C DRNG 12611 155TH AVE 5E FLOODING OF BACK YARD 627A7 1-0216 SR DRNG 12611 155TH AVE 5E PIPE SIZING/DITCH MAINTENANCE 627A7 I 1991·0339 C FLOG 11212 137TH AVE 5E PIPE OF PRIVATE DITCH 626J6 1991-0432 SR FLOG 15630 SE 124TH ST CLEARING OF LARGE PARCEL 627A7 1991-0578 C DRNG 11833 142NDAVE 5E WATER PONDING IN YARD 626J6 I 1991·0797 Sl STUDY 15630 SE 124TH 5T BECK 627A7 1991·0797 S2 ON HOLD 627A6 I 1991·0898 C DRAINAGE 15212 SE RE:NTON-ISSAQ RD HIGHWAY DITCH CLEANING 627A6 1991-0932 C DIVERSIO 15630 SE 116THST DITCH OUTLET ON YARD ' 627A6 1992-0100 C DRAINAGE 12240 142ND AVE SE 626J6 I 1993-0387 NDA DRNG 12203 148THAVE SE PONDING IN YARD NDA-F 627A6 1993·0387 RN DRNG 12203 148TH AVE SE PONDING IN YARD NDA-F 627A6 1993·0437 C DRAINAGE 11204 148TH AVENUE SE ENCLOSING ROADSIDE DITCH 627A6 I 1994-0213 WQC DUMPING 11800 148THAVE SE CONTACT HEALTH FOR SPECIFIC LOCATI 627A7 1994·1000 C FLOODING 11615 148TH AVE SE LACK OF CONVEYANCE THROUGH PVT P 627A7 1994-1000 NDA FLOODING 11615 148TH AVE SE LACK OF CONVEYANCE THROUGH PVT P 627A7 I 1994-1000 RN FLOODING 11615 148TH AVE SE LACK OF CONVEYANCE THROUGH PVT P 627A7 1995-0009 C EROSION 14701 SE 116TH ST ADJACENT RN OFFSITE FLOW INADEQ. 0 627A7 I 1995-0104 C H20LEVEL 12050 148TH AVE SE GROUNDWATER IMPACT PVT PROPERTY 6l7A7 1995-0689 C EROSION 11204 148TH AVE SE SLOUGHING OF ROADSIDE DITCH 627A6 1995·1037 C DITCHES 11224 148TH AVE SE STORM EXCEEDED SYSTEM CAPACITY 627A6 I <;-0143 C RUN OFF 14614 SE RENTON-ISSAQUAH RD RUNOFF FROM SR 900 626J6 ', •• 6-0157 C DIGGING 12227 148TH AVE SE EXC IN WETLAND 626J7 1996-0185 C FLOG 11625 148TH AVE SE WATER MISSES CB. PIPE DAMAGE 626J7 I 1996-0323 C WETLAND 12227 14BTH AVE SE SAME AS 96·0157 627A7 1996-0552 C FLDG 11615 148TH AVE SE 626J6 1996-0552 R FLDG 11615 14BTH AVE SE FLOODING FROM VANDALIZED FIRE HYD 626J6 I 1996-1193 C EROSION 11204 14BTH AVE SE REQUEST TO ENCLOSE RlS DITCH 627A6 1996·1284 C EROSION 12257 1S6TH AVE SE EROSION ALONG ROAD SHOULDER 627A7 I 1996·1771 C RUNOFF 12227 148TH AVE SE ADJACENT PROPERTY IMPACTS fiLLING? 626J7 1999-0151 C DRAINAGE 11624 142ND AVE SE INTERMITTEN STREAM CHANNELIZE INF 626J7 1999·0334 C DRAINAGE SE 120-124 @ 156TH SE QUEST REDRAINAGE EASEMENT & HIST 627A7 I 1999-0417 C FILLING 15019 SE MAY VALLEY RD ALLEGED FILLING VIOLATION PREVlOUS 627A6 1999-0725 wac CREEK 14613 SE RENTON-ISS RD CONCERNS REGARDING SEDIMENT DRAI 627A6 2000-0473 C DDM 11800 148TH AVE SE ADJACENT PROPERTY GRADED AND GRA 627A7 I 2000·0528 FCC MMG 11640 146TH AVE SE COMMERCIAL PROPERTY CHANGED TO 627A7 2000-0760 WaR was 11204 148TH AVENUE SE Mrs. Waltrip has mulched all exposed soil to s 626J6 I 2001·0027 C DDM 11800 14BTH AVE SE HISTORIC DRAINAGE PROBLEM. PREVIO 627A7 I Pego 2 012 I I 1;" " ~~"f,\,::I'o;. . . ' --'. ::.--:s.::.'t. A!,,_ ..-! , ,', ~~ DRAINAGE a;"~ r u .' J l 4Tll couGtR HOUNTAIN PARK 36 --+-f---------j-;:;, ____ " COMPLAINTS LIST EXHIBIT / I I I I I I I I I I I I I I I I I I I ------, JIJUA U8 SJtOCr lJ'U 142ND AI'!' n """",b_ """",. _.- tao69 SI ,mil Sf Il/J'fZ VAIUY. r ... I*t38 I I'IiTRICtA III11NlJER JlU8 IfZND AVE Sf ~ rA ItIOU KEllHt;rH • " nNA. " ItJG6R IlUO IUJI1) "11i' n _ .. - KC R-4 1ULT£1l II It KAr1lR'nI JiIOllNSON ,_ UZIID AI'lr 5B IlSNf'OII. rA 18D6, TWP. 23 N., RGE. 5 E., W.M. (}638100180 KC RA-5 -""""'" J_ ~ 71'H cr _ .. - 06J81oo220 IJIIDJIA'KIIW. CBIIW:II OF f1I1I! NJlI $QUUU G/lOQI' 118411 '""' AI'J' SE IIQt1OIf.rA._ 06J81oo212 JI1c:IlA£I. .. It JWUIIIU I PAXHIA '//R() ,""' .lIT $E UNrDH. r .. ~ 06J81oo210 KC RA-5 j-_________________ '-p".::t.-..:. r ~C i ~ '" ri:'~' ,iTT nu+, __ .. '---J ,,':ff',{,:g,~~ \ { \ ,.-----;-l f ":\-VI' .... 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IIOIIUJItHT POSI1IONS ~T IIEI'IC NOT OlIIEt'JtY QllSERloED USMO fi;P$ SWM'Y In:I'I'iICILQ lOt" 1l£() N1lI 1H£ CDN1RlIt 1'0«1$ II1VZWIJ IDCoI Q.ECDlOfIIC TOTAL STA11CW$ FlIR 11/£ Il£ASURSl£NT OF 80TH NlQE$ AND DlSTNItZS. 1N'S.sutKY IIEEJS Qt D«'£EI)$ 'fH£ sr.w:wtaS' SET ey II4C .J.U"-I.llI-aIIQ. Datum 1E1l11CN.-N.4Kl U HR 011' OF RINJfIN Benchmark rJIssIt£NsJ:~FOUID~1H£~&~.IHS1RE£T (sC rUTH SO AND I~ 041£ $E JI1II -A" S£T ItR $1W N II; FACC OF IIIJCIO POST I.D' ABOK (;IWJC fS~ SCUrH OF SII' ccrt OF PARCll " a. .. ~7tI JI1II -S" TOP OF 4"X"" CONe /ICM.JJm{T 1'/ r &'«SS DISC AND PUNCII AT PROPtRI1' CORNf1I m~ SO/JrH OF gn; ..ar SIDC IWlH 041£ S£ a.~al.J Legal DescripUon PARa1 , FR()JI Ill.4oVSN.4IU1 nne tIlSlJRANC£ CQ QIi!tIfR No. .M2OU7'; LDT 2 Of' IfJNG caMTY SHeRT /'(.AT Nfl. 1171ODJ. RE.CtJRlJE1J UNfJER RCaRIJMC NfJ. J3QSJ.JQS.lt R£CORDS OF _ CW'fn:; 1IUIINIOn;N. S'lUotJE" IN UtE cotwl1' OF ~ $!'AI£ OF IIII.S'G¥GRW. ~FR()JI WANSHAIJQV nllCfN!UWIt:ECIl MOrR.v.. ~ JHC _1H HAlF OF IHC NORTH IIAlF Of' JHC IdJRIH HAlF OF 111£ N()IlHAST QUAR"IUI CF 1H£ SOII1HCAS1 OIJAIfrER OF $EC11ON 14 rowHSItP V NI::WD( fbW(;£ .5 ~ lUI. IN IIWQ CCI(.Ifft' IIUHWOItW; nrD>T ctuITY ROoUI. (J4lH 041£ SL) Notes 1. MSf1lUWNrA11aI FQII' IHS sun£Y IIIU A G'£ lIMIIE JHaIlICUJI" NifJ ElETRONIC DISTANCE lHASIJRINrJ IH1. ~ U2ZI N IHIS $!.lIMY IIVIt FDD JRA\O:5£ II/£EDII(J at oamr.v ~ SET tIY IIIW .lJ2-r.»-094 z. THE W"ORtIA"fICN lIOfClED ON l'NS lIN' RDfI£S£NfS JH£ R£SKJS OF" A Sl.tl~Y IIAD£ IN JIAROI. 1001, NKJ CAN (X Y B£ ~ /1$ ~IIIIIC 1HC aMRAL CCNOfrIDN msJINC AT IKtT 111£ J: AU. £laS1INC (}N-!itJ£ S1RIJCTIIR£S 10 • IIOf(Mll 4. MIJAaJIT PARC£l LCOUlQJ5 AND t1MER5HtP PDt W1RQSCAII tD/l'iJ/.2QOt. !I. 91£ II) B£ II.ASS Qt4OlII. ,. OfT-SII" $£NS11IK ARCAS ~I!" ''''1.1: 7. SlCHT Dl$TNICC II£I4IJfI£lI (II SC1"1DIIIDI 17. ZOQZ a R:lIm\jQ lIIWNS FOR tors 45-M IIIU. Dl$CIWIC£ ro WAC' II .. CCW1tll.lltS _ III 1H£ N()ItrH OF THE PROI'£1fTY PRtJWI)£D BY OOR£ lJ£5ltiIi f1fCItI£l:RI.Io IIIi/J HAM!" BEEN ClW'f/lCNJ..Y BU1fDIl) rnH IN!" CINSlI£ CI:IJi7lX,IIf$. 02001 1IIW) AS$OCIA. lImN.? ,.,."._. ...... ~.,..,. ..... ----_. - t. nd O • .el,~ '".01 C" .vl""" ... oq: i!! ).. Q: ~ ;e ~ iil II: • ~ i II g~ ).. ... ... ~!5 ~O~ ~ ..... II: O~;: ~iU;I ~CC!1!: ... ~ C/) ..... ~ ~CI)Ili ~~:§ uLUtIl ;::! l!i ., e f: ~ ~ '" .. ~ 8 ~ .~ ,~~ ~- -~~ l'IiilICI iiliiii\li tIiIlItT ItIGIIIIIII I'iIJILT WIlIStii'i lIItiiDiti nJS! SIIPllWo 1m!: APRL J. 2002 SC&IIi: I11III.; r--,w 1IIZ:/ifA £lNd; 12/16/02 srl¥P KOl 'WD IIKIDS &lC1!ID £l!II WD I "' .. 01-047 ....... 1,,2 I ... ~1tAN') A. ... {~ ~ T _ , FOOT 1HI0( W .. DlAM£rcR + 6' L .. 8 FU:T OR 4)1 DWrI£rcR. W/HJCHnOl IS GR£A V MDRUlOEW r""ow QUARRY SPAJJ..S: PA5SJN() r SOUARE StElfi lOOX PASSING :r SOUAR£ S/'nf': 40-60% oVA)(; PA5S1NG ~/ •• SQUARE SIf'\e O-,~ J/AX. ROCK LINING DETAIL NOr It) SOIL£ "tP~--' 20 _--t----2~ __ -..------- SCALE: 1-= 50' Fn7n7~ ~~~J 22 23 24 25 F"l LA --- ~"n7~ ~~j 17 J7""1 ~ 1 1 J I , 'II 0 2f' i 100 t :j -------___ . . L ' , ' ...... O. I I rJ7n'U",,~ f j f J ~~",~J 1==3 i 1 b.u.cud. ~ . '. 1 \ I =~~... .. ----/:'-;--;. ----------__ L ________ IJI}~r..11 . . . \ If ------------,--------.J';'l~ I. . .' ',"~"", T-------,-------i ' ~-----____ _ • \ , , R ~ ,. I I • · . ..,..::!:.~·-·1 C "-. . " . " . \ .. '", I ... ;...--......... . '\'-' . 'i ~ I ~ , ~u,j \,,9 ~ I L.l OZ002: tRIAl) ASSOC:lA.' /T.~ --11.MI15l1o-.NE -~-425.821.11448 ~,~ ----- lOBi O ... l.pm,., C •• ,uhUI. ).. ~.... :itt: "t::).... III ~~ aiO~ ~~ l .... &: ~ ... ();c:~ i:!' ~lli~ ::) It ;e )..~ ~cr:lli: It -= ~ i8 ~ .... ~ ::l~ :::;;CI)~ 1Il;o: "t ~ () &:!ii! (,) ~ L&,jlll ;::! !!...l. ,. ! I U ~I ~ '" ~ I ~ >: ~ '" ~ g~ ~wt. ~--- -..-,~ --NiiIid' IiitliIId JiIIiiiti' iliii\:i:m bd!lD'ti' lim SUEIIIIb1. DIJI: N'Rl. .1 2(J(J2 liD1&: amI.>'''-6O' lIIZ=IVA SJ'm NOr "~ umss SIGH!D.WED " .... """ 110. 01-047 I 2.,2 I ~ -.. VI .-;c --.. ; -§ FIELD CHECK LIST FOR PRELIMINARY PLATS Take: Tape Meas Thomas rothers Ca a and Film Drainage :. _ /5/Cf~1 f /J% Evaluate~ of proposed R/D tra~an points of discharge Walk downstream corridors of all sub.basins~ Evaluate u stream flows coming onto the site ~/f~ J~I ~~~J9t~~~ Look at potential floodPlains~ t!n1 ~tfl""'J (I!tI,jiPfl; Ill) C!'1Jf!1/; C' Roads: '. -~ IHI. ~W Sight Distance/ (Iud (f)1l1 r1 i ( 10 o/M0 --t/&rlitp{ t/t/r(tJ '# Intersection, Spacing -t;h,N /b fll!f/J -f!:/~ 10 lJf)frPJ ~ 7NA Pedestrlan/Blcycle Usag~ " Frontage Improvements -nul f/rbl1t7 Existing Road Conditions -~6,1 / / .' , Pavement and Shoulder Widths -----J.-II /f/fJ t ) (pI 1f;1I,,!( f , 1 ItUAtJ ~J"'" Speed Limit on Perimeter Roads_ "J,L lI iI!. j "./.'" '/£110 1Bus Stops 0 ta -;;J df/TL atf"lW6J5 m 7# iPotentia Road Stub Locations V hc"II(,'l~ Check for dead ems -100 lot rule V/4 Pedestrian facilities, walking routes to sc~ol /JJ6e-p'~ ."Ja"y Environmental: fJJ~ 1J~v/ f; tf!(::// t'/,#ij~4 /'7 118(>;. -ffir/l; 4 lilt M i1 Traffic Safety Issues-7<'~ 4 . ~P1 ~/}O Impacts to Neighbors ~ hetl/lt;hfJ 4 #rrlY'rl Vegetation Clearing Impacts "-/ltrI 111 /j.'(J Buffers From Adjacent Properties'~V m6l1l'O,!tJ Noise Wildlife'\... )~ks misc\field 03/20/97 J iIj«/~ VfI I n./ ® Kins County Dept. of Development and Environmental Services Land Use ServIces Division 900 Oakesdale A venue Southwest DATE: April 4, 2002 TO: Issaquah School District, ATTNI ___ J~6L-46S~r~~~~ __ _ T("6v-...sf'o,~'h 0'" ( Planner, Current Planning Section 5~ U loS 0 V PM: Lanny Henoch, REI PrQPosed Plat of RentQn East (DDES File NQ. L02POOOSl The Land Use Services Division subdivision in your District . the Land Use Services Division (LUSD) has received an application Enclosed is a copy of the plat map on April 3, 2002 for a received by In order for us to adequately evaluate this proposal, ~rovide the most accurate information to the public, and for LUSD to serve the School District better, please provide us with the following information: Which schools do you anticipate the students living in this subdivision would attend? Elementary ~411n Jr. High/Middle /JJo/4-/:?OO Sr . High A//3£lf!ri (""'1$ will the students walk or be bussed Elementary ~J) dwe/(JI"~ I$-With,., to hese schools? .h--- Jr. High/Middle, __ -"B.="..:S:.:5:::::&:.:' J):::..... ________________________________ _ Sr. High ________ ..:Li.~H~~=S.=£~R~ ________________________________ _ If the students will be bussed , where do you anticipate the bus stops will be located? If that information is not available at this time, currently, where are the closest bus stops located to this site? ,c Elementary 118 1'(' IJJI"" 5.£'· @ S£ 1.:2cJ J'L.sr (f Jr . High/Middle ILit I<-lJye S£" @ .sF I..» "" sr ~ Sr. High !1 ? ft.. bY, S£ #2..s; /,.#2 -/'< 57 ' Other Comments: -I{-One ~IJ<:~ Wi // he fz; N--ve-t<.... .tL/! l&!?U'!1iJ tvtu.-cd lift' ~ 5 E -(-S"G r 2. 0 Sf-1n S~ ,..., -:-r= . 1/ -h v.n;+ -hr ~ ~, t1 5+ /i/; Zf?, (Pft'.1 ~-;:rr--~ -fr~jC ~ ILff'~SGr . . 'Please comple~e this -fOrm -and return it by April 26,2002 to the address below . If you have questions regarding this proposal, please call Lanny Henoch at (206) 296-7168. Thank you very much. King County Department of Development and Environmental Services Land Use Services Division RECEIVED ATTN: Lanny Henoch, Planner 900 Oakesdale Avenue Southwest Renton, WA 98055 -1219 Form96/SPRS /ReqSchol.lnt cle 1/6/2 000 APR 252002 KING COUNTY LAND USE SERVICES l I I