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HomeMy WebLinkAbout03317 - Technical Information Report . � BAIMA & HOLMBERG INC. � — 33 /7 �I � ' � M � TECHNICAL INFORMATION REPORT for Annie II Short Plat December 12,2005 I r�viytD `-��ZN�O(� cJY1L PE �I 1�` oF "AS�Y �� 2� w J�G,; '�r � � � � � �U d � � � � ` '� �0 4 �0.� ii3s2 .�, I G�' ��1 S'PER� � I �sslot�7aL ��� ; EXPIRES 11/30/06 Baima & Holmberg, Inc. Job No. 1004-028 Prepared For Bilt Hughes ,,, � 15220 Cedar Grove Road !••i�� � � �^ Issaquah, WA 98027 '''� "'� �� _ , �-. ' � � ��•. 100 FRONT STREET SOUTH • ISSAQUAH • WASHINGTON • 98027-3817 • (425) 392-0250 • (425) 391-3055 33 �� . .� :� TABLE OF CONTENTS SECTION TITLE 1 PROJECT OVERV�W 2 CONDITIONS AND REQUIREMENTS SUNIlYIARY 3 OFFSTTE ANALYSIS 4 FLOW CONTROL AND WATER QUALITY FACII�ITY ANALYSIS AND DESIGN 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN - 6 SPECIAL REPORTS AND STUDIES 7 OTHER PERMITS 8 ESC ANALYSIS AND DESIGN 9 BOND QIIANTII�S,FACII.ITY SCENIlVIARIES,AND DECLARATION OF COVENANT 10 OPERATIONS AND MAINTENANCE MANUAL i � - � i � I SECTION 1 I� PROJECT OVERVIEW �\ IE�417.97�12"DI) ._ _ ._. _ _ — _ _ _ _ � _ —. _ _ _. _ _ _ _ � _ — _ � — _ — — — ' _ _ < �� , - - - - - - - - - • . NE 2nd STREET _ • --. . F%.«MH � � • .— � ' ' ..L. RIM�419.70 �w �� • � f�m .. � I,�I, �_ _ '— '_ s_ �� � s_ s_ t_ s_ E%�LUL RT � �- � ' E%.�B"SSs r s �_ a_ _ e — s=s_ :i—s: SSCO��-- .+.. 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SHOP � ; I - ; > ..._ _ ,; p l Q pF T BE I � � $S SERNCE Ex . a0°� � �� �,� REMOVED ��c•crc�a+e �� I � i 1'p RENAIN � � . /% fII10E �i �, HOUSE TO ' � REMovc iz'a !. I �• I �3 0. I � REMAW ex.c�R�ce 3 ; p � - -I -I '1 �- Ff=418.87 � n �S ' ' � Y' 3- 3 I f� a ! sl o a— s— a�, � . r. r�i � n � -.�,.._....m.'� _^._J � i� Y � �^ 0 5� . .... ,.._... �... ,. ✓ p ..._.c ._........, i- � ^ i � .., N ..... ' .. , � � . �....�. .$ � � / �� _ � � � ? N � � � � ' � LOT 2 _ - -- r, r, 9.SS7 SOFT. � � .. . . �, : ! ' ...... .. 0.22 ACRES CYCLONE �.�. /� T/� ) 1� 1 CY ENCE���_i - .i' '� . : �`_�_ ENCE � LOT 3� � .� � � ' __ TAX LOT N V. 1 f .,....p....--f. , ` _^�� V . _ �,� , � a �. AX OT N0. 471 —0 61 ,0,9,�S�T. � � I 6 W00 � � � �.. 7 � i Q FENCE , LOT 4 '� � 10,933 SQFT. � � � M1 - 0.25 ACRES I � �� , I l _ — � _ — _ — � � t0 BE•Rf O�fO " SDUTH LiN �� I�NORTH HALF TRACT B 1 \ . d .! � * \-' ,s �� OT g I ETRT HA9F ` � I -. � `"� � �BLACK-�t FIVE ACRE TRACTS ACT '� --------------- - -�------ �-- °� I BLACK LOAM -,�_._._.. .....____..., _.__ -�---g8�ze'Qs'E---- - ---- ------ -1------------- �LQL 1�',�f�1Q1 -Br.na'--- �aoo'------ __ ='' � " FIVE ACRE E IST ClRCGE I I �-79_04'-'" i PRNATEROAD ANNIE'�S PI�ACE iENc�cO° j � TRACTS S Of�T PLAT � __� � � ` �, I C�- i— — A�4-��IIT6�--�P1__ LOT 2 ' � � � � - - -�- - - - --� � LOT 3 ------------�LL-�4=�403__�----- � � � � II � \ � � / �'��\ i � '-- -� �� N � � � � �� � , � �r �.�-�--� � � / �� �fi�T� CJ / I \ ! �� � � ���,�I�i � Y � I �� i � �. ._,._.._�.._t4 , ,r � p i ¢ . . Project Overview This project involves the development of a 1.08-acre parcel into 4 single-family lots. The site is located at 5511 NE 2nd Street, at the southeast corner of NE 2nd Street and Lyons Avenue NE. The site is covered with existing house/garage/sheds/shop/driveways/yard. The site generally slopes down to the south towards a private road under construction and/or to the existing roadside ditch along the north and west sides. Per the SCS soil maps, the site is underlain with Alderwood sandy loam/till soil. Proposed Stormwater Control Included calculations show that the site is exempt from both detention and water quality requirements. The roof drains for the lots will be piped into the existing CB at the southwest corner of the site. The frontage improvements will include a 12"pipe/CB storm system discharging to the same CB at the southwest corner of the site. i - �(FIR sT.1 14'LND AVE. S.h.�. 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O � � � m �� ...�W � r� � -mi p o� m � �-3 � W ' z o � 9 O � zy � �� � Z � � � O z � � King County Department of De�elopment and.Environmental Services TECHNICAL [NFORMATION REPORT (TIR) WORKSHEET -Pait 7 .�PROJECT OWNER=AND , ;Pa�t 2 :_PROJECTiOCAT10N�ND: . _ _ - � �PROJECT�EI�GINEER �:° : _. _ �DESCRIPT1qN; .., � - - �Project wner ` ` Proje t Name � ,u� r����s �,ru�.T P/.�1c� Addrls�Z � C�p�� /�� Location . �3 p Township �.L Phone f�j0�(//�� -6�QZ� Range ,'��� _ ...��Section '/ . Project Engineer +r'� � ��� - Company �' �, Address/Phone � F'.art� TYP.E�QF P_ERMIT - '' ' . x ~ APP,LiCAT10N�..::.z.._ ,�- _ � :'� '`f'art�.�flTHER RE111EVYS=AI�D P�HMITS �-$� : � :�. Subdivison - � DFW HPA Shoreline Management �[ Short Subdivision COE 404 Rockery l� Grading � � DOE Dam Safety Structural Vaults _ _ Commerciat FEMA Floodplain Other i _ Oth�r COE Wetlands • ' _ . � � - �;.� .��.�:��� :, � � .�..,..�..r= � �P,airf v ,�S(TE COMtVI[3NfTY AND.�RAiNAGE BASIN- - - --� ,> - - - -�• _ _- Community �`.,,7 D� li . Drainage Basin � P�art 6 SITE�CNARACTERISTfCS - - River Floodplain . . Wetlands Stream Seeps/Springs Critical Stream Reach High Groundwater Table Depressions/Swales Groundwater Recharge Lake � Other Steep Slopes _ ._ : _ _ I _ -Part_7_'.SO1LS ,:.;, „ - I Soil Type Slopes Erosion Potential Erosive Veicoties � _ p ����'`�?'o � w Additional Sheets Attached , _ , :: ;: . -Pa�t 8:..DEIZELOP.I�AENT�LIMITRTtONS= � , ; _ � _ � R�FERENCE LIMITATIONlS1TE CONSTRAINT _Ch. 4—Downstream Analvsis ���L � Additional Sheets Attached �rt`3��SGREL�CJ1f3EMENT� - -� } - 3 - , - -- ; - _.;��� _ - - - `r = - 'i MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS ', � OURING CONSTRUCTION AFTER CONSTRUCTION � _ Sedimenfation Facilities � (�Stabilize Exposed Surface . �� Y Stabilized Construction Entrance .. � Remove and Restore Temporary ESC Facilities �Perimeter Runoff Control �- �Clean and Remove All Silt and Debris (� leari�g and Graing Restrictions V nsure Operation of Permanent Facilities f/Cover Practices Flag Limits of SAO and open space UConstruction Sequence preservation areas Other Other '�?art'10 :SURFACE WATER SYSTEM _, ;_ _ . - - _ - � Grass Lined Tank infiltration Method of Analysis Channel _ Vauit Depression Pipe System _ Compensation/Mitigati Energy Dissapator Flow Dispersal on of Eliminated Site ' Open Channel Wet(and Waiver Storage � Dry Pond • Stream Regional Wei Pond Detention � ' - ,,; t - Brief Description of System Operation . �-_ ''"'�'`_:. � �_ �_" _�_ �_�; _ _ .; � :� : f '. . � Facility Related Site Limitations Reference Facility Limitation �ait�1 �S�'E�UCTURAL-ANALYS[S 'Part i2 ;EASEItiIEt�1TSF-CRACTS � ` �'� = - - Cast in Place Vault Drainage Easement Retaining Wall Access Easement Rockery>4'High Native Growth Protection Easement : � Structural on Steep Slope Tract " Other _ - Other Part�3 �IGNATURE�OFPR,oF..ESSIflNALENGINEER : - � � .�,_:� .... ..._,:: . � �..r._.� __ :� , ... ._ - .� : f or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of - my knowledge the informati�n provided here is accurate. Si ned/Date Project Overview I� This project involves the development of a 1.08-acre parcel into 4 single-family lots. The site is located at 5511 NE 2nd Street, at the southeast corner of NE 2nd , Street and Lyons Avenue NE. The site is covered with e�.sting !, house/gazage/sheds/shop/driveways/yard. The site generally slopes down to the south towards a private road under construction and/or to the existing roadside ditch along the north and west sides. Per the SCS soil maps, the site is underlain with Alderwood sandy loam/till soil. Proposed Stormwater Control Included calculations show that the site is exempt from both detention and water quality requirements. The roof drains for the lots will be piped into the e�sting CB at the southwest corner of the site. The frontage improvements will include a 12"pipe/CB storm system discharging to the same CB at the southwest comer of the site. SECTION 2 CONDITIONS AND REQUIRIV�NTS S Y SECTION 3 � � OFFSITE ANALYSIS � Project Overview This project involves the development of a 1.08-acre parcel into 4 single-family �', lots. The site is located at 5511 NE 2nd Street, at the southeast corner of NE 2nd �I Street and Lyons Avenue NE. The site is covered with e�sting �I house/garage/sheds/shop/driveways/yard. The site generally slopes down to the I south towazds a private road under construction and/or to the e�sting roadside ditch along the north and west sides. Per the SCS soil maps,the site is underlain with Alderwood sandy loam/till soil. , Upstream Tri6utary Area There are no upstream areas draining onto this site. Level 1 Downstream Draiaage Analysis The site drains to a private street under construction at the south property line (Al) and/or to existing roadside ditch along the north and west sides(A2). Flows from the south property line continue south across yazds under construction and into a wetland(B1). Flows from existing roadside ditch along the north and west sides drain into a 12" storm system(B2) then to the same wetland as above, about 250' downstream from the site. Flows continue flowing south about 600' to a 12" storm system(C). Flows enter the CB/pipe system flowing south then turning east at a catch basin(D). This flow continues east, then south through a 12"pipe, crossing the east end of the cul-de-sac of SE 2"d Court, about 1100' downstream of the site (E). This pipe system continues about 200' to the south side of an existing R/D pond(F), discharging onto a rock pad. Flows continue south into King County then east then south about 800' through A 5'± wide stream(G) though Maplewood Park to near the north end of 148�'Avenue SE. Here flows enter a 30" inlet pipe (H) and continue to drain south through a 30" CB/pipe system in 148�' {I) about 700' to a King County stormwater R/D pond (� neaz the intersection of 148`� Pl SE/SE 139�'Pl, well beyond '/4 mile downstream of the site. Flows outfall from the pond to another King County stormwater R/D pond (K) near the intersection of 148�'Pl SE/SE 142� Street, about 1200' beyond (about 4,000' downstream from the site). That pond outfalls to a ravine leading down to the Cedar River, about 2 miles downstream from the site (L). Proposed Stormwater Control Included calculations show that the site is exempt from both detention and water quality requirements. The roof drains for the lots will be piped into the e�sting CB at the southwest corner of the site. The frontage improvements will include a i 12"pipe/CB storm system discharging to the same CB at the southwest corner of I the site. 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I __�� Mo�,�, �� YFE cE �„ �' � ' � �J1�� � r � , 1 � � ,.. .... , ,... ,.,; ,.. . .. , N �I � + 4' CYCLONE , � l 0" CEOAR FENCE S' CYCI E ,I O ,� Sf %�-� FENCE ��\_ T:�.;ti ._ � �a I � �a 6' WOOD � \ �l ?�� / a FENCE �`----� � E .. I � � / + \ o II� ORTIi LINE SOUTH ALF LOT 9 ��i—' — ' � � �� � � 7.41' .. , ..::t 2t oa � ,�:. •s f:i'IF. kC.f?E= Ti?;�.{:T:s i'' .. �1�� U r ' � t':11.. f�---�_�- I « � E IST CIRCLE � � �� � I n L� 8' WOOD ._„ «.��� ^ � �= 0 �� Z � O d � j � �l � � � S Existing Conditions SBUH 100-yr Peaks ---------------------------------------------------------------------- **************�***** S.C.S. T'Y'FE-lA DISTRIBUlION ******************** ********* 100-YEAR 29-HOUR STORM **** 3. 90" TOTAL PRECIP. ********* DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1.2 1. 1 86.0 . 1 98 .0 34.5 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .54 7.83 11312 Developed Conditions SBUH 100-yr Peaks ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3. 90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) ' A CN A CN 1.2 .6 86.0 .6 98.0 6.3 PEAK-Q(CFS} T-PEAK(HRS} �IOL(CU-FT) .96 7.67 13245 0100-yr Peaks = 0 . 96 - 0 . 54 = 0 . 42 CFS (< 0 . 5 CFS) _> Detention not Required 4 SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN � � laD�oz,� .�B BAIMA & HOLMBERG, INC. $HEETNO. OF 100 Front Steet South ISSAQUAH, WASHINGTON 98027-3817 CALCULATEDBY _ DATE (425) 392-0250 FAX (425) 391-3055 CHECKED BY DATE SCALE . :. ... . _ _ . . : . ._ ��5� �� � � � - . . _ � _ : .._ � � y�� � r►�c �� � __ � �un��� �r�1�� � � : : _ : _ : 5A = zo �o � Qz F : : . _ _ _ _ _ _ _ _ . . (�z �. o r?�v`r�,� ��� ��t�'�v7 � , --- -- .. __. .� ------ _ _ .. S/� = ��� 5� . _ ...__. ... ._ a _ _ _ __ ._....� .. __ : _ � �. .: . _ . �r� 2� � zP ' r�� � �� : � ���,����,,�� 2-year SHUH Peak for TESC Design ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2.00" TOTAL PRECIP. ********* DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 1.3 . 9 86.0 .4 98.0 6.3 ' PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) ' .36 7.83 5288 . • , . . SECTION 6 SPECIAL REPORTS AND STUDIES . , , . . � I I _ . � SECTION 7 OTHER PERMITS . � � ., SECTION 8 . ESC ANALYSIS AND DESIGN v • � w SECTION 9 BOND QUANTITIES, FACILITY S ES, AND � DECLARATION OF COVENANT � _ 0 2 . IU - 4� � _ _ . � . . I . SECTION 10 I OPERATIONS AND MAINTENANCE MANUAL �� - N� � N