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HomeMy WebLinkAboutSWP272212(1) I DRAINAGE ANALYSIS/REPORT PROPOSED PLAT OF LA MESA IN CITY OF RENTON N.E. 28TH ST & ABERDEEN AVE. N.E. S.W. 1/4 OF S.E. 1/4 SEC. 32-24-5 OWNER/DEVELOPER: Q W.A. DEVELOPERS, INC. �p��" J. 18000 72ND AVE. S. , SUITE 206 KENT, WA. 98032 �� 206-251-4020 y �c im ENGINEER/SURVEYOR LEONARD GANTZ IAL 3721 S. 352NO ST. S-`� - �s AUBURN, WA. 98001 P RES 71v 9la 206-874-0158 CONTENTS: PAGES: CORE REQUIREMENTS I SPECIAL REQUIREMENTS 2-3 TIR REPORT 4-29 � o CORE REQUIREMENTS: 1 . DISCHARGE AT THE NATURAL LOCATION. THERE APPEARS TO BE NO SURFACE DISCHARGE FROM THE SITE UNDER EXISTING CONDITIONS. PRECIPITATION DISSIPATES BY INFILTRATION INTO THE SOIL. THIS PATTERN OF GROUNDWATER RECHARGE WILL BE MAINTAINED WITH DEVELOPMENT BY INSTALLING AN INFILTRATION SYSTEM IN THE SOUTHWEST CORNER OF THE SITE. THE SYSTEM WILL BE DESIGNED FOLLOWING KCSWDM METHODS FOR PERCOLATION AND SOIL TESTING. THE SYSTEM WILL HAVE THE CAPACITY TO DISSIPATE THE PEAK FLOW GENERATED BY THE 100 YR. 24 HR. EVENT AND OF COURSE ALL FLOWS BELOW THAT. THIS CAPACITY WILL BE BASED ON THE ACTUAL INFILTRATION RATES MEASURED AND WITH A FACTOR OF SAFETY OF TWO. AN EMERGENCY OVERFLOW SYSTEM WILL BE INSTALLED WESTERLY IN THE N.E. 28TH ST. RIGHT-OF-WAY AND WILL DISCHARGE INTO THE EXISTING STREAM APPROXIMATELY 486 FEET WEST OF THE SITE. THIS SYSTEM IS FOR EMERGENCY OVERFLOW ONLY AND IS NOT INTENDED FOR ANY SORT OF CONTINUAL DISCHARGE INTO THE STREAM. 2. OFF-SITE ANALYSIS. THIS IS COVERED IN TIR SECTION III. 3 . RUNOFF CONTROL. NO RUNOFF IS EXPECTED TO BE RELEASED FROM THE SITE. THE INTENT OF THE INFILTRATION SYSTEM IS TO DISSIPATE ALL RUNOFF UP TO AND INCLUDING THAT GENERATED BY THE 100 YR. 24 HR. EVENT. THE RUNOFF WILL PASS THROUGH A POLLUTANT CONTROL STRUCTURE AND A BIOFILTRATION SWALE PRIOR TO ENTERING THE INFILTRATION FACILITY. EMERGENCY OVERFLOW WILL BE PROVIDED. 4. CONVEYANCE SYSTEM. THE CONVEYANCE SYSTEM WILL BE UNDERGROUND PIPES. THESE WILL BE CHECKED FOR CAPACITY FOR THE 100 YR. PEAK Q. 5. EROSION/SEDIMENTATION CONTROL PLAN. AN ESC PLAN IS INCLUDED WITH THIS SUBMITTAL. MEASURES INCLUDED ON THE PLAN ARE: ROCK CONSTRUCTION ENTRANCE, FILTER FENCE, CUT-OFF SWALES, TEMPORARY SEDIMENT-INFILTRATION POND, TREATMENT OF EXPOSED SOIL. o SPECIAL REQUIREMENTS: 1 . CRITICAL DRAINAGE AREAS. THE SITE IS IN AN AQUIFER ZONE 2 WHICH REQUIRES BIOFILTRATION TREATMENT AND A LINER UNDER THE SWALE TO PREVENT GROUNDWATER CONTAMINATION. 2 . COMPLIANCE WITH AN EXISTING MASTER DRAINAGE PLAN N/A 3. CONDITIONS REQUIRING A MASTER DRAINAGE PLAN. N/A 4 . ADOPTED BASIN OR COMMUNITY PLANS. N/A 5. SPECIAL WATER QUALITY CONTROLS. REQUIREMENTS FOR AQUIFER ZONE 2 WILL BE MET. 6. COALESCING PLATE OIL/WATER SEPARATOR. N/A 7. CLOSED DEPRESSIONS. N/A 8. USE OF LAKES, WETLANDS OR DEPRESSIONS FOR PEAK RATE RUNOFF CONTROL. N/A 9. DELINEATION OF 100 YEAR FLOODPLAIN. N/A o 10. FLOOD PROTECTION FACILITIES FOR TYPE 1 AND 2 STREAMS. N/A 11. GEOTECHNICAL ANALYSIS AND REPORT. THIS PROJECT WILL NOT CONSTRUCT ANY DRAINAGE FACILITIES WITHIN 200 FEET OF A STEEP SLOPE, ON A SLOPE STEEPER THAN 15% OR ANY BERMS HIGHER THAN 6 FEET. THEREFORE A GEOTECHNICAL ANALYSIS AND REPORT IS NOT REQUIRED. 12. SOILS ANALYSIS AND REPORT. A SOILS REPORT HAS BEEN PREPARED FOR THIS PROTECT. TECHNICAL INFORMATION REPORT TABLE OF CONTENTS PAGE I PROJECT OVERVIEW 5-8 II PRELIMINARY CONDITIONS SUMMARY 9 III OFF-SITE ANALYSIS 9-12 IV RETENTION/DETENTION ANALYSIS AND DESIGN 13-25 V CONVEYANCE SYSTEMS ANALYSIS AND DESIGN 26-27 VI SPECIAL REPORTS AND STUDIES 28 VII BASIN AND COMMUNITY PLANNING AREAS 28 VIII OTHER PERMITS 28 IX EROSION/SEDIMENTATION CONTROL DESIGN 28-29 X BOND QUANTITIES WORK SHEET RETENTION/DETENTION FACILITY SUMMARY SHEET AND SKETCH AND DECLARATION OF COVENANT 28 XI MAINTENANCE AND OPERATIONS MANUAL 28 TIR SECTION I PROJECT OVERVIEW. SITE DATA. THE SITE IS IN THE S.W. 1/4 OF THE S.E.1/4 OF SECTION 32 , TOWNSHIP 24 NORTH, RANGE 5 EAST, WILLAMETTE MERIDIAN, IN THE CITY OF RENTON, KING COUNTY, WASHINGTON. IT IS LOCATED NORTH OF N.E. 28TH ST. AND WEST OF THE NORTHERLY EXTENSION OF ABERDEEN AVE. N.E. . THE SOUTHERLY OR UPPER PORTION OF THE PROPERTY SLOPES GENTLY TOWARD THE WEST. THE NORTHERLY PORTION IS ON A STEEP SLOPE ABOVE AN ABANDONED RAILROAD GRADE. THIS STEEP PORTION WILL BE PRESERVED IN ITS NATURAL STATE AND DESIGNATED AS A NATIVE GROWTH PROTECTION EASEMENT. THE SOUTHERLY PORTION OF THE SITE WHERE DEVELOPMENT WILL OCCUR HAS SOME LARGE CONIFER TREES AND A FEW DECIDUOUS. BLACKBERRY VINES AND OTHER UNDERGROWTH UNDER THE TREES COVER THE WESTERN THIRD OF THE SITE. THERE IS ONE HOUSE IN THE CENTER AND TWO CABINS IN THE EASTERLY PORTION WITH LAWNS AND LANDSCAPING. THESE ARE TO BE REMOVED. THE PREDOMINANT SOIL ON THE SITE IS INDIANOLA, WHICH IS A CLEAN SAND RUNNING FROM FINE TO COARSE. NO WATERTABLE WAS ENCOUNTERED TO A DEPTH OF 12 FEET IN THE TEST HOLES. THE TOTAL AREA IS 2. 22 ACRES. AFTER DEVELOPMENT, THE AREA TO BE CONSIDERED AS CONTRIBUTING FLOW TO THE DRAINAGE SYSTEM IS 1 .66 ACRES WITH 0.56 ACRES BEING ON THE STEEP SLOPE AND IMMEDIATELY ADJACENT TO IT. THE 1.66 ACRES IS BROKEN DOWN INTO 1 .02 AC. IMPERVIOUS (CN 98) AND 0.64 AC. PERVIOUS (CN 77) . THESE FIGURES WILL BE ROUNDED OFF TO 1.0 AND 0.7 FOR ENTRY ON THE SBUH COMPUTER PROGRAM. King County Buft"and Land Devok p wit:DIVI" TECHNICAL INFORMATION REPORT MR) WORKSNEET . 0SWAT 7pwimcjrnqinaww er W.A. Developers, Inc. Pm*dName La Mesa Plat 0002nd Ave. S. Kent Location 2 - z Town)p 24 Ranps 5 T Ponnrd rantZ Section 32 any Self employed f*raiso %u 2.4 AC 3?21 S. 352nd St. tJpsiroam Drainage Bann Size 0 AC _ AAu�burP n«'o Wa. U74- Subdivision O DOF/GHPA C'7 Shaelinet,Aanagement Shan Subdivision [] COE 404 C-1 Rodcary Grading O DOE Dam Sabty Structural Vaults 0 commercial 0 FEfVAFbodplain Ci odw C� 00mr 0 COE wetlands HPA Community City of Renton D`a"apeBasm May Creek into Lake Washington 0 R -- Fbadplain ED 811rsam.. __ -- Q waltands ED OnbW Stream Reach 0 Sesp"mngs O Dwassio^moa"aies Q High Groundwater Tab* L) Lake — ® GroW"Uw Recharge ® SMePSlopee -- n Otter 0 LakasklNEresion Hazard — Sal Type Slopes Erosion Potential Erosive Veloaees Indianola---- o fight------ - slow � to north r--1 AddisenalOmtaAltelched -- Inn o King County BuShcnp and taod Davabpnant DMOM TECHNICAL INFORMATION REPORT(TIR) WORKSHEET REFERENCE LUTATK*VSITE OONSTRAINT ® Ch_4•Down0WM An#0M The northerly portion of the site which is a p stee slo e will be esi a e as a native � grow rot—ection easemen loo$ Fu—ITding Q setback li e will be established from the top Q of the steep slope. Q Site is in aquifer zone #2 [] Add Aio W Shoats Aftoolmd LWO"ESC REOUIREMENTS LOW"ESC REOUMIENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION ® S4dimr+t 5m F&cWb a ® mw*i=e E Sudan ® Swb koKi Ca sbucpan F_romme ® Ren and Raafow Twnporay ESC Favin in CM Prrim W Runoff Qw4ml LI Cwan and Rwnow AN Slit wW oabAe ® CNwmpandGaditResubtione ® lEmmopwasonamwmewrtFeam" Q cwm Praabm ® Flap limb oI NGPE$ LM Construction Saquwm Q O&W Q O#W ® Gram lined Channal Q Tank ® h obn ® P40syswm CO Vaud p O n sion SBUMafhoeot Q OwnCh&YW Q &WWDisaapabr Q FlowDiapwaal b�st� CD Dry Pond © Wedond Q wr Wai ot�S9aaga Q Wet Pond Q $beam Q Rapionalonanion Brief paaorfptionoisyswmOwrrion CB & pipe collection System, pollutant control structure, bioswale, infiltration tank . Famft Raiatld Fac iwtbna Ijnw�n ElAddAiwWShm%Aftud" ear U SWDM infiltration _ No closer than 200 ' to top of steep slope to north. — I © Cam hftm vauk [] 00r Orak Eaaw+rera Q RatarMnpwan Q AooaeeF.awmwq Q Rack 4140 O TNaM lb Offl~rvMcnEawaant Q skud ww on Skep Sbw Q Trod Oew I w•aMt aa0hew undw aqr super' F- Imo ft Wd tlr ear Aanl a1w eowNaena•oasanea f my nowsed lea Mrs thu @n pro a/ana qr trra Ike To M Msat of my Iu�erMyOs Ms YMormstwn poridsy .rrr. MAPS AND TRANSPORTA TIONOEZ 19 tA.E �F N /y T Gird RAM :lFoll *p + CwM ��fl plrlon .. lJ�h no '� R nse.�an.w.. �hQrok s T w�iF`tl x _ # .zsRr. .� CO am«. s i AA i �+r nwonion ..w .,Y.. mmm� wrr++r�rw ar. �t••• ar.r nw'.r ,Ac p w�w�w t aft = MAP 2 zMeba t = i O'Nvn r ji Wyy t ! i Z.Kiv i s m River ! .es�s + `. Y �WJ,e�M V�irf IJ: M .MW., • + �F6W.M1 Z a 7 � S+w7ct Sri Q� ei.a,oar.,e„a d NOW ~mms"WO O •Mf rA Je raKa �c q y4 KAMM d STATE , ,a i ! r r « PIERCE co.� y � ! AI Yf1AM�K TIR SECTION II PRELIMINARY CONDITIONS SUMMARY. PER CONDITIONS OF HEARING EXAMINER: 1. ERC MITIGATION MEASURES: A SETBACK FROM THE TOP OF THE STEEP SLOPE WILL BE PROVIDED AND SHOWN ON THE PLANS; THE APPLICANT WILL PAY THE APPROPRIATE PARKS MITIGATION FEES; A TREE PLAN HAS BEEN SUBMITTED. 2. A NOTE WILL BE ON THE FINAL PLAT MYLAR STATING NO VEHICULAR ACCESS WILL BE ALLOWED TO N.E. 28TH STREET FROM LOTS 1 THROUGH 4 . 3. BOLLARD PLACEMENT AT THE WEST END OF N.E. 28TH STREET IS CALLED OUT ON THE PLANS. 4,5. A HOMEOWNERS ASSOCIATION WILL BE FORMED AND THE ASSOCIATION WILL BE RESPONSIBLE FOR MAINTAINING THOSE PORTIONS OF THE RIGHT-OF-WAY ABUTTING THE SOUTH BOUNDARY OF THE PLAT. 6. THE LANGUAGE FOR THE NATIVE GROWTH PROTECTION EASEMENT WILL BE THE SAME AS OR SIMILAR TO THAT USED BY KING COUNTY. THE BOUNDARIES AND SETBACKS WILL BE DEFINED AND NOTED ON THE FINAL PLAT MYLAR. 7. THE SCREEN FENCE REQUIREMENT IS SHOWN ON THE PLAN. TIR SECTION III OFF-SITE ANALYSIS. SEE THE PORTION OF 1"=200' TOPOG AND THE SECTION OF ASSESSOR'S MAP FOR THE DOWNSTREAM ANALYSIS. 0+00 UNIMPROVED RIGHT-OF-WAY OF N.E. 28TH STREET (TO HAVE 12" STORM SEWER INSTALLED WITH THIS PROJECT) . 4+86 24' OF 15" CONCRETE CULVERT UNDER DRIVEWAY ROAD. 5+10 OPEN POND WITH SMALL DAM AND WEIR STRUCTURE AT NORTH END. 6+70 OPEN CHANNEL 2' TO 3' WIDE AND AVERAGE 1.5' DEEP. 7+80 24" CMP WHICH APPEARS TO PASS UNDER A CONDO-APARTMENT BUILDING. THE PIPE AT THE OUTLET END IS A 30" CMP. THE OUTLET IS IN A HEAVILY RIPRAPPED BASIN. 9+70 NATURAL DENSELY VEGETATED CHANNEL OR DRAW LEADING NORTH TO MAY CREEK. 15+30 MAY CREEK TO LAKE WASHINGTON. DSA CONCLUSION: THERE WERE NO VISIBLE SIGNS OF FLOODING, SCOURING OR OVERTOPPING IN THE REACHES OBSERVED. 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TYPE-IA DISTRIBUTION •**********+******** +►;*+***** 100-YEAR 24-HOUR STORM **** 3.90" TOTAL PRECIP. **+►*+►*+►** ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 .7,77, 1.0,98,10.9 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1.7 .7 77.0 1.0 98.0 10.9 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 1 . 17 7 .83 17698 ENTER (d: ] [path]filename( .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: MAX Q INFILT SYSTEM LA MrcSN 1$ ci IrJF_,, •� RAt td�a �CE__:,a-C:f A\.L `C c�.a\S WF_R.� �on►� c�.rr-TAR P. M11atMJN� TES'C *to. It p EL.1$Ca t.0 `CoPSa1l�/FZOo-C Z„F+1.�E. `j.p LooSE "�� ME.D�unn j FOR PlRc. _ 0Ro WN FINE SANS � 10 CzL.Z-l(a T No "aEt�° pW � �C. 7JeTToM oP P1pt FOR PccRL T��T ..t NA . 6 E�nw 'Top -Ti WA. 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N/A TIR SECTION IX EROSION/SEDIMENTATION CONTROL DESIGN. FILTER FENCE WILL BE PLACED AS SHOWN ON THE ESC PLAN. A TEMPORARY ROCK CONSTRUCTION ENTRANCE WILL BE INSTALLED OFF THE END OF ABERDEEN AVE. AT THE SITE ENTRY. A TEMPORARY SEDIMENT POND IS TO BE CONSTRUCTED AS SHOWN ON THE PLAN. CALCULATIONS WERE MADE TO DETERMINE THE REQUIRED SIZE FOR THIS POND. A CONSTRUCTION SCHEDULE IS OUTLINED ON THE PLAN. TIR SECTION X. BOND QUANTITIES WORKSHEET - NOT INCLUDED WITH THIS SUBMITTAL. RETENTION/DETENTION FACILITY SUMMARY AND SKETCH - NOT INCLUDED. DECLARATION OF COVENANT - N/A. TIR SECTION XI MAINTENANCE AND OPERATIONS MANUAL. N/A. '7 _sue _ SEO \ MF�v � -CKAS�� Po N1J •UL- �\C.�tia Cot%APu-vVz SEA \MEtJC STCiZACa3c �Ol-JME_ ug\ �3G uSLrc EQUAT�O►a = ASEo — R " KxLSx C-qx �� w='w Ns to 4_S9 x O.\S x 0AS x 1 .0 x 1.3 I .C. x O.'L S = 0.4r To u 1-c A.D 0.4 vbL.UnAt-- 0. 05 W\�L_ FaE. 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