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HomeMy WebLinkAbout03328 - Technical Information Report /�/� ��a���u�,inc. Zz5PH:s4 5��837 BOB3� IFXA�(425) 837 ❑583 ■l! 5URVEYING ENGINEERING PLANNING GPS GIS CONTACTUS@GEODATUM.COM N m � m � � �7 � � Renton, Washington �� Technical Information Report For: Roberson Short Plat 1601 N E 24th St �, OF R NTON Renton, WA R E�E�V E D , ppR 2 7 REC'D � � pLAN REVIEW II � � GeoDatum Project No. 2004-254 Revisions: � . � • � • ♦~ X' ,A t� �" ,^�°��""�stiyo, � °� ♦ � �•�� �, j�Z,� `s � �= � �� : w -� �°� • ; � � �. � �°. 3'I976 °� ��.� � �,(� °°;��isr�+�°°` �� � � �+ssb����♦� �Ti-�ft EXPIRES 12/29/2005 � Prepared by: Mark X. Plog, PE, PLS ROBEqSON SHORT PLAT-TIR PAGE 1 OF 1 2 4;'7/2005 3328 G�oDatum�� Table of Contents Section 1 — Project Overview Section 2—Conditions and Requirements Summary Section 3—Off-site Analysis ROBER50N SHORT PLAT-TIR PAGE 2 ❑F 1 2 4/7i 2005 G�oDatum �._ TECHNICAL INFORMATION REPORT (TIR) WORKSHEET , . ' . � � • � , , , . � � • , . � � � i i � �� � Project Owner:William Roberson Project Vame: Roberson Short Plat Address Location: Phone Tow�nship:23 Project Engineer:Mark X. Plog, PE, PLS Range:5 Section:5 �'�Q C�Btu�,,�� SIJRVEVING ENGINEERING PLANNING GPS GIS � � � , � � � 1 ' 1 � , � � ' � � � Subdivision r DFR� HPA r Shoreline Management r Short Plat r COE 404 � Rockery r Grading r DOE Dam Safety � Structural Vaults � Commercial r FEMA Floodplain � Other r Other r COE Wetlands ' • � 1 1 ' C Communi � Green River Valle Draina e Basin East Lake Washin ton—Renton � . . � . . r River � Floodplain ------------------------------------------------------------- ---------------------------------------------------------------- r Stream � Wetlands ---------------------------------------------------------- ---------------------------------------------------------------- r Critical Stream Reach r Seeps/Springs r Depressions/Swales r High Groundwater Table r Lake ------------------------------------------------------------ r Groundwater Rechazge r Steep Slopes --------------------------------------------------- r Other � . � Soil Type Slopes Erosioa Potential Erosive Velocities Indianola Loamy Sand 4- 10%. Slight r Additional Sheets Attached � R--� � GEoDatum �� TECHNICAL INFORMATION REPORT (TIR) WORKSHEET , . : � � � � REFEREVCE LIA4ITATION!SITE CO'_�ISTRAINT �Downstream Anal sis r Additional Sheets Attached � � , . , . � . 14INIMUM ESC REQUIREVIENTS MINIMUM ESC REQUIRE�IENTS DL"RI1vG CO'.�1STRUCTION AFTER CONSTRUCTIOV r Sedimentazion Facilities � Stabilize Exposed Surface r Stabilized Construction Entrance � Remove and Restore Temporary ESC Facilities r Perimeter Runoff Control r Clean and Remove All Silt&Debris r Clearing&GradingRestrictions r Ensure Operation of Perma�ent Facilities r Cover Practices � FlagLimits of SAO and Open Space Preservation Areas (� Construction Sequence r Other r Other � , . � � . 1 Gra�s Lin�d Channel (— I�,ink � [nfiltration '�lethod of Anal��sis: �I � Pipe Sy stem r Vault r Depression KCRTS Level 2 � Open Channel r Ener�Dissipater r Flow Dispersal Compensation/Mitigation of r Dry Pond r wetland r wai�er Eliminated Site Storage � Wet Pond � Stream (� Regional Detention Brief Description of System Operation: The system will include individual infiltration facilities for each proposed lot. Facility Related Site Limitations Reference Facilitv Limitation � . . . � . . r Cast in Place Vault � Drainage Easement r RetainingVvall r AccessEasement r Rockery>4'Hi� � Native Growth Protection Easement r Structural on Steep Slope � Tract r Retaining��l'all r Other . . � . . � � . I or a civil engineer under my supen-ision my supervision have visited the site. Actual site conditions as obsen ed�aere incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is accurate. Si ned/Date ROBERBON SNORT PLAT-TIR PAGE 4 OF 1 2 4/7/2005 , G�oDatum,.� II' The existing ground cover is predominantly second growth forest with some grass and landscaping. The proposed development will preserve much of that ground cover in it's existing state within the wetlands and associated buffer. The wetlands and buffer constitute an area of 21,489 SF or 48% of the subject � property. , ��� � . ,4.. -� , , ,. t . , , "' �. •1nC `I AkF ... ••: • ••J 1 ..- � �! i� ����' � ip~ '�� I �� •• � -'7� � � � �� � • '4� • �w��-i � n C � � Y'��( � Ili • � � • • .'� �� �.���� •• � � �I y_ ��w� r � •�• • Project Site ' . . .� � D N . • • •� � ' � � . �, � •� • �M• 0� � .• �, z . . . . � fi _„�4 � . . �` � ;1�.,�; � � •� •• '���• •1 * � I ,; ��� i s �J • . L�. ;' � li I � � � � �,1 • • ' � •• ; � � �i:, ;.j � • • � �� ` i:.: : ` . ' � . ti � a� �'� . • � ^� '. .� Indianola Series � 1 • ;� �- � �' � • ' � � � 1 • '�� ;;�-��- . �'��� � .� ��,;; ' .. „ � �� �. • r � � �� �� � �� i � ��1�� � . • \ .' � . I S, . I 1 � � . \�'w '� �l • •'� i• �, •; � I�� '• • '�i ... i � f'r�-7�-"1�1 �I a The site consists of Indianola Series loamy sand soils (hydrologic class"A") per King County Soils Survey. These soils are suitable for infiltration. This proposed short plat will provide individual infiltration facilities for the individual residences during construction of the homes. The existing home shall be retrofitted with infiltration facilities. ROBERSON SHORT PLAT-TIR PAGE 6 �F 7 2 4:7;'20�5 G�oDatum.�K Section 2 — Conditions and Requirements Summary , The following summary describes how this project will meet the eight"Core Requirements" and the I "Special Requirements"that apply: Core Requirements 1 through 5 1. Discharge at the natural location: Currently the property drains directly into a stream that bisects the property. The developed site will discharge all stormwater flow to this stream. The hydrology to the wetlands associated with this stream will be maintained by directing surface flows to the wetlands from the new lots. 2. Off-site Analysis: A Level 1 off-site analysis was completed for this project and is contained in this report under Section 3. 3. Flow control: The proposed infiltration facilities will be sized based on the requirements of Section 4.5 at the time of building permit application. The flow from additional impervious surfaces in the right of way is not detained and is allowed to bypass. It is anticipated that the infiltration of 100%of the roof runoff will compensate for the bypass flow. , 4. Conveyance system: Flows will be conveyed using the existing stream as well as within culverts provided for the new curb and gutter improvements anticipated as a part of this project. , Upstream flows will not be impeded or redirected as part of this project. 5. Erosion and sedimentation control: TESC plans will be submitted along with the engineering plan submittal. Erosion and sedimentation control will be provided along the wetland buffer and also within the street right of way during the construction of any improvements. Special Requirements ', o Critical Drainage Areas o Not applicable o Compliance with an Existing Master Drainage Plan o Not applicable o Conditions Requiring a Master Drainage Plan o None o Adopted Basin or Community Plans o Not applicable , o Special Water Quality Controls ', o Not applicable o Coalescing Plate OiUWater Separators o Not applicable j o Closed Depressions I o Not applicable o Use of Lakes, Wetlands or Closed Depressions for Runoff Control o Not applicable o Delineation of the 100 yr Flood Plain o None o Flood Protection Facilities for Type 1 or Type 2 Streams o Not Applicable ROBERSON SHORT PLAT-TIR PAGE 7 ❑F 1 2 4i7:2005 G�oDatutn.�� o Geotechnical Analysis and Report o None requested o Soils Analysis and Report. o None requested Section 3 — Off-site Analysis A Level 1 downstream analysis was conducted for this project in March 2005. During this analysis, a site visit was conducted to determine if there was any evidence of conveyance or erosion problems downstream from this site. Study Area Definition and Maps The study area extended %< mile downstream from the subject property as described in Section 1 above. The following map identifies the study area and the significant features downstream from this site. � �.��.I_L�N 2�B7M_3Tj'`'� � �.'_' f''�, .���,�'. � - -,�'\�� G:v, }, - '�,, �;} 11'y } 'I 4`� —,�' . 1 ��� �� �� ( �`� �I�� t . . — ._ _ - �. i hE28 HST: �., \ �� E � { , .f � � { � � �.�t t tiy. t t ` � ��� ' -� '� �� t '� ���--�� � � `.'� �'���� �� i ti .�- � .��- � � ' € � � - .-�_, -. � � ; � 3 _ '�-.�,�``� ; ��� y� , :, � ��� 1 Open ditch enters tight �1rJ ; ' Z'i � �,�`i` �, '� ' _ �--z f line conveyance system ' t. .` \ ,,Q � � ! ' ` 3 and passes under I-405 at ? � �'� r�;�r�� �_; _ �� �, , � , ,:'� ( �`'`;; � ? . � rk j` this point. f t L' � -- ti�y; j l � 1 ,i-� ' �c � ��: , .�. ; l 1 , ti � , - �ti'�1� t{� ;� � E . , _ , _ ; i� � �,gj L��si �, � � � ,��.. _ �- - �a , TTl /` �= Tr- ,`'t` y r t� J� s �,�--� 1 : . :,N,-�=STb;P� .` \, 1 i � �t 1 '�� �� � � t� `\�`',,� t'� +?�' , , ( _ �.,-_ ��, � ti ; ', Open ditch (see photo) �' , , ��\,�' 7 � 3 { . j " S �; � . { 4� � , 1��L li �..I` � � -� i'�� ,� f � 'v t i �� , , l , i }�; � , �� � ti1 C011t111U@S t0� j;---����' ,,—. —�--r; �`��� � '���� s.._ =� ���1 Puget Sound �`�._`'�`.�'_` � �, J 'z� � 'r��`/. s� f , , -�i ;4, € � :� r��� s � � � ,l�-� t � l� � � �i—.�� � �= } '� - r � ^ � l {��Y ; �I �_� N11H:Sf - r��� rr. . � t 7i.'ST I I ��� i �' i�lY��"r� t I i T` _---, ` 'j � .___ ... {� f- t 3 -'�� � � � L���� ;�4��j 1 1 I'� � 1 1 � . �n ,�� � ' I + 1 r + ' '�' i J''��"`:� �t` �� 't p`� ) 1 � �. �:� .� i 44r-y�� 1 ' '���, i�y�_ �a � t .��-rl5is -5 0 } t .0 � . =� � tl U t� 1 5�� ,�� c :. r � l �5t� I � �f�/i , �e,� i� �i l � , ?,.`.,��� �.y� ,.,1�t'��1���\ �,,� '� 6;<' �: � ; i ��, ' � �` ��p tt �i �v�� \ .�_,_- _�T 1 � � Y{j---+ i`�11 �1�� r �` ��,�tist\t ,\� I Z �i' � F� l � i : ��� ��1 ' � ' a � � � �,. � ��� t , ti �1��l �. �'���x � ,ti e�` � � " �;••,z;_t_. _ � d •� ; ���� `� ��7� � . ��.��,,;.�,`����� � :� , ; � Project Site ��! j ,t ��� ti ��� � ;� � ���,`� ' �_..bl � � ��, �' _ ti t d � �i t� + ;. � � � . , � ' r ` ' � 1 � ♦��--+-` _�-"� . \s�'' ltit4 ' �;�`�1 ��� �'�aI' 14 ° , , ,t , � t ,_-�- n���,y �, �-��� r �i ������ �ti��\� t�� ��,i � � j � � � �1 � �� � � � � 1���1s �`� l ' ` --. �{ ',�,, , i y �� ,, ' ky�}l;� '� d' � � ���\`�— ��I a`-.. . f �. , �_}�� rI I� —'�,_ _,�;r—�{ 'I �fOlt\ � 1���[ _. ` � `��'15� � i .. Y ; p�� _' ,;�r 5 ,�•� � \ ��. �l ll��l � f 1 } �1� " � • 5 \ � � � � i ��\ � � 3 5�1� ,� II� y 5. 1 ` t_�..-��1� �_ .� � - 3�1�i�tii}}�I � �� ��� � 1 �� . � \ � � � ��,4 `7� j ����tiV 1 i�� �ti,1�J,�� � ,,� Su i,_���._.'_.,n �� � �� '� t' �� � � � � 1`, � v' ��� I I��E � �� ' ti E ��'-�, � �" l� � � '�� 4 J � , r t � �1 ., �vJl µ � �M,� ` t I � . . t1 �4[,i l \ ��. , i��Y ,I p I)I(� � � �� q5-1--.-,."-q-��i y_-,-,- �. . - � � . F'I.,T.' _... t � I �I + --_ ,�.5`,. 1 � t't4 � �,.�Y4� ��i��''1il�t ... Yl�i� i��t�i� � �'�t L i (--� �—_i ,�.`+ , I ,� � ' �'-y- ' ' 1JJ { 1l �,�N� �. , �:. t , •�i� , i •r��, �,z +��� ,� I I'� t' ':�---�-�`—� _�r-i �1 ;�M �� .� � �� i' t� ,�:i:�t ; � �, ,; � ;�.. _ ! y , � � � .�, 4 �� �j. I A ,A � I �1 � � � � � i �� � � ����I� " NE+9T�i� \� , 7 �4 1 � a�\ `, - . �I�d,ii i��� . � . � �I�. �� _ _ , — � -r ' ,,.�_ ROBERSON SHORT PLAT—TIR PAGE B ❑F 7 2 4/7/2005 t�EoDatum.�.� Section 3 — Field Inspection A site visit was conducted on February 20�', 2005. I, The subject property currently surface flows to an unclassified stream that bisects this property from south I to north. Adjacent road drainage flows into roadside ditches that convey the flow to the stream near the ' point that it exits the property. At the north end of the property a 25"culvert conveys the stream under NE 24th St. From that point the stream continues north along the I-405 right of way to the point where it is tight-lined under the freeway and continues to the west into Puget Sound. Not all portions of the stream were accessible due to locked gates and fences, however, all portions which were visible showed no signs of erosion or overtopping. All banks were well vegetated and stable. All culverts flowed freely and did not contain significant amounts of sediment. There was some sediment observed in the culvert under NE 24`h St which should be cleaned out in the course of completing the improvements for this project. The following are se�eral photos taken at the site during the visit: Photo 1 —This is looking north from the south side of the property where the stream enters the subject property. � ��� � ���;�+{ 4�...c_'�Ys����� .'.., .4 �j �"v. � � �...r.p/ r�.`-' ����w.� $__ d f- �a��' I ( ��+" .�^."r .�,,,�__'� r ��_ ' �q.. z `a- . 1' a 3 g�,, �y � ��� f•g � �y � � �` � y�' £��:� - -�z ' _ y�` �- . ?v" -�s._ � '�II �..��rt `�.� �"� td:C�r - fi , , '� ' .'d � fa . .1 �� �._ �,. �` ; �e k � �t��.� �k -sf._ .� �.` . .F �. .'.�{ -�.�--' $ i y �� t.-:' - � *�-' -'�.-`%s'r�''k,� � ' M� �` } �� •� .�y, _. � i .� � ��'°'�' �_ "i' �� ' �g :. W q �33� ��.� _ . . . = n �� �.1'... 1��� -. �.t� �' � �,�a a * �� r ��. + � _ � , "`� '� ��� �+ ' � . .- Y,se� �§�v�`'��u�",,�. n�° �,� - . � �� � � ! � __ , �*��,�:33 �� �� £a . . r � r �.. � � , F..��. S. . .'� �q� �*s.. - _ � � � :# '� � � __ ^c;'��� �� �i�. �E', ' _ 1�" 3_ i. ' ��� � `'"'�y�- _ ' , 4 _ ��- � — � _ .; c �. ���,. � �,t � _ :i� �q' .. ` `�" =r e `�� ! x ~�� ` �� � s� ��� ;`��� _� ,. � � � : �' `�, � e'� . &^ � Y � � ��� f ,�-��, � . a�� ,v, , ��r .t - £�ir ���� .� .���� ,�°�<.� .� : � � �" .� s. � ; +U� _ ��t�Q I�� � ,� � ' #..l_, ��Y � - i. �'P : � �. + � .�� �t. �_ . �. .` �}..4 �II� _ � '� r���' �,}' � � ' � 11.,, � ,� :. �: � �-�::-��; � ,_; ',�, r r, i.�'i , , v � � � �. � .��. �� .Y_� 1 lG T'F��� t ��! . r . . ! ' ,. ',., 5. �-�. x:� �'�,��.. � ..� R�BERSON SHORT PLAT—TIR PAGE 9 ❑F 12 4i7/2005 G�oDatum,�.� Photo 2 8�3—These is taken from south of the southeast corner of the site and shows the offsite roadside ditch which continues onto and through the subject property as well as a closer photo of the roadside ditch on the east side of the property. � � �"'` - ;, s � P � �t_ ., t' � / ! T�L ?r�g ei � -t �r �l� M�+�s-^_ � , ,.-�4^'�,-+4,��� .1 � `� -~ GM �r� t!}}`� � !l.' J�'-"J-� � -�,�rf �. �# � � f r _ '�}� �" y _� .lf f- ,r �a S,�.`�.%a;c ���,. �^ 4- - �+'�` !c , � . ��.t---•t - � t -y� ,E't' r � � \ : .. y � r a . .�'"`� t:' ./ � Y - - � .,��� > � � " � �� ^ � �� �� - ! ° . j ,r r .a �. �. it" �. ��i y h� ��� ��i yp t �,,jj-�� t �t !-:y � �� T �� '� 1y'r�M� /! _�� # .�.�r .�� yyi�'�s ��y f���:A - S �;}� ����:�j ?`i���� �4 ( - " �f� ! � . .. i ^ �� � F �� �� ��i�� ��� � � �� � � ;,� t �� �� � -�. - + �-, �� �::� �. , - - � y� � E � � '. � ;�;. - `� 1`� 1 �� �ir� �"_ _ �...�� , � � " �' � --. u"'r".++ '��f��gr � �``� ., _ ��. � + "�' a Y.�m , � '� " � : � .i� €� � . � t . , � �: -....,_� �'' ,,, ��,: . -� �, :� _ _-_��,y Ev`� j }'� I I I�P� �'7 �� _ .� � � #�` .•3 -_ � I i��. �,�� �� ��s . -� ��, ^�t _ n _ ' ' � _ a �: 1 -'� ' . %c � T''. 'W « -. ,- � ti . _ � �� _ �_- , 'c. ;�•�' `� � :. . � - e... ' ... .,. �� i . . . ._ � - -.. . ;.. '$��- ;_�. ..3 -faf�1 - •� �aT � + `� p�� . `(r � F ? ,� � �. ,.s�a. ;a�, v. �-:� ♦-f y e: r rw,�" .,'� �+}�t .�" '� �,� - - 1 �. .yt --_ ���. '�# _ � a � � �;� a ���.:` a � � e � � i ' 1 = . ��� � � : � .. _. . _ ,�. { �� I '� �. r =�� "�,`, s. �; �..',����t," � i - ,. 1 ! ii��fr •.��,�� � �rr�§4 �— r _ �€ - . ''E;r . . ... .. �� . .. t.-. �4 _. a'�. ,��' ROBERSON SHORT PLAT-TIR PAGE 1 O ❑F 1 2 4i7i20O5 G�oDatum.�� Photo 4—This is taken from northeast corner of the site and shows the roadside ditch which continues west to intersect with the stream.. �, . ,., �� � �' �-�� L �' . k` ?l �i+��-'�'f �'' -'. t* � � ���,,� t _ � �. � r � ��*� �_ � p��� ``� �� ��.Y�. '� �� 'y! '. i T.� _ _ ^xt7.t �. _- Z� •.-�: �: e � p_ �- ��d ., ....�. � - k��-�'"�� . ,� � _ �t�` -.^,+;,e- �.,- ?-. =�:---�� �v - �-` — � �r'Y. �, .. .���".i�" ' ���' ..4`� �� '~ `x'`a � � �_ �r s �;_ �" � „c ,� ��� ' ,� 'y _ — ��M.i r �. � ��� .:�,' . � � ��'.� "�.�i'� s � .�?"���-- e: - - � c� ���':. ��'. � ;.�,� . Z��ab � �,.,� i i 11 �� Y, .\�� '�`'s -� - � �h��� �._ ,'�n� . Photo 5—This photo shows where the roadside ditch and stream intersect at the north end of the property and then enter the 24" culvert to pass to the other side of NE 24`h St. kr�.� . i„ c.+1� � ,r ..- 1••.s K y�; ,ti t • s+ �� "� . ,�.t y�� "'L��a' p�,.�..�.re � � . vri �� �t `��s��; t+A�:.7E' . +�.°_; �'}�►,�\w��, i�"�..ar����tu �!� 2 �"�''��,.ic���i��y� ���. J'_ ��'� '��°> '�z'r t �1�. ``�s ; �#�'"t���, ���� � �`� V ,���;�'� t �t � �� � ^, � ` �.�i�t �� � y X� �}����� � ����i �.�+r , � ��a��t �� �.,t+�_' .s, �` ,� a, ' � ��i J\ �� . � � _ ,:- t= h r � �._.[ rF * '� � 3 I i F t #,}� Y� �S� .- r � J t .��'F�L d � e � ;�i��a�.* • �.�� �p�� � �`• F 0•`�+ �5��� � b. �<< t 1 6 {,! , 3 �,' � / ��� �`` ' �� ik s �� �:.� {,� {���.t�� '��"�d,r �� ri� �J 4��� � � �6 ` ' F .. L �i .� �, � /� � � � - .� *� �A � -- �„ +fs.� �� f � � - � �: • g ���, �3 . }�i . ���' .. .� �� .{ A� 1 # h �;;� � 'L� C�. .. ��'�� � �:� . � .�e T 5��-��r��:��� ��,•�s �r, c�. �A j .� � � O �� ,,ir -bS�tA►�, f , ��� ���: `(li ,�s'{i. � `9_ :� � .J � ; 4 � "�. � j�'.,',�?c !'�t:�''� +` � ' ,�:`� tai��,�'���' t � '�',� � ����,�,,'. � � - . J � a, ' A-�1a �, g��`�= � � �, �'�s �� ,��.. .�'-�� � � � -� � F '� °,A�L..'����%".�1'�d �{�'���y`� `~���� �t }�����.. � .y— �, '�f���I �� t���- g[ � ���.j� � `�iL�+. �' 1 4 ?� > \,�-.•4 d�� ..��. �,� d��'�`��+ � � �a �,{,��'L. �`.vir �'s.�'����;� �5 M,.�, � '�'�"_� �.� t �� �''., •��' �`� r�, ' sa { , • �< +q "� � .�q 7� ��� ,. � .. ' - i`°I�f= "'ir �-� _ � L I �►.��5-. � .� -g� $- ,a� � ,g."� p��v� � Y Y�� R. 'L. �'.�'�(� 'i+�- �S.�i�. � ; �F ���� .#� -i �€� 'r. 'r". y'...� ic4 R . . ;Y_ �K g C , ? ���+� �^� ' ���.g,{_y � �'�s"� ` �� �.�s_ �, .� � `r�, .r .�.; 9w �4 `r�.�'�j3'�^ =c��}.�Jx ��'"�:a¢' r n'� a. s __ �. Y #� � 1 ';3 ;��y� +'�F ' `� �Y� � 3 y.���3`��F � ����l�e�� =r�..,�� �y y.� �'�. � ��* ' "'� �.?�� . 1�F���f v:7-� T' . i �- , ����t �:�.�. ,��_,�,r .�._�'.y!-....�,� ... .���:���� ROBERSDN SHORT PLAT-TIR PAGE 7 1 ❑F 1 2 4/7:2005 Ei�QDaturt�.,K Photo 6—This photo shows where the stream continues to the north along the I-405 right of way. j �.i ,. � �'4'•� :e '�.-�yS. �� ��(' ��,� y- . y r.��, F rt S� � � �''�P:�� r���� �,� �.� ��r��� � f �: 1 ,. 4 � .� ' � ��ti ��Z�����.� I i. � .. � �C �'` �.�3Fs, � 'x-� �f': P :��_. � ; � � � $ ���.� � � �� a '�"��' �".� .,A .� � 1-J�"�°C•s*i+'+�g � ��s � � �` r�- � a� � �3 �" ��:„w..! ��� r �!�^�'���� r��.�"� i � r� �s� �� �"x~,,,� � '.'�2�,�� ,� {�z. z�,��x��'":���'; hi�y�`or ��' .�J�,q�. �� p1.S .'�� -'�� 11 �.". " ��.� ��-. �_F..,_ a} f � +...� . �` � ���,� _ �a��' ,. ..1� � � :� ��'° $` C � •�+ j t 4� �� 5 �.-g � F.:- � + �� ��;� ���:�� ���,<�K�,,�}� �, "L '`4 i� ..r -,�a" ��'�Lx3'`,} -- "�` k �����t�'�,;�� s�' r� � �.+%�!�"� ,� ��'�.. .� �� �� -� �'.�+.�,���� ,'� �:fq'`�ti'�,tt _�� � �� � � �t 1� � '_ �� il! �R ' i . z! `qry4������i�+ 3 .#�� .?' .�r r. . ' � j ��. "`� ��! ;�riyrf, �s�` �`- �. � �. � �'i. �f�t'��t �' � d �` �� � 1 ta� F �y� �" `,, 4 1` t 4i r�:��' •�ff ' f�� � ��. � �i � .� . � 7�'�•. �'�T� ���5 iC. _ �P �'t�' 3 . ; - 'i �: � .� c� � � i �♦ •°4 ` "�f,�s' C .'���� g 4+ � .y, � t,� �� v�� ; t .1F'� � �4.f`�'� _',A�i�ry `j� �s ,. ` _ - �'. Y`d�`i `� i'.7 �� '✓ Tj �'�- w��'j� . ��' �� �- '�t -��' � �� �.�••-� �� i� ��.��` _�E � .� "�": c - ' a-�R �`; ` .'�-�. . �M f +� ' ���;A�,� �� � '� �+,� � I �;.���"�.'#4����. �1��„ ' �� , �Y� <=�;'��,.-,�,�,��� �� i-F \ ♦ �1~��, ��,1`f � ,g�y, �' - •"���•' = -,��. � . � � tli��, �4 � `� � :�•" S°� ``� —.� �,..+r ..7 '.''�'��" : �..�; �_ ,.,,� � ��.'�-�„�� [ - �-��7i,�`i���7 rj'L�4 ` �� �'j `���'.' '��. � Section 4— Drainage System Description and Problem Descriptions The drainage system as described above appears to have adequate capacity. Currently the only problem identified is some minor sedimentation of the culvert under NE 24th St. Section 5 — Mitigation of Existing or Potential Problems The culvert under NE 24�' St should be cleaned out as part of the proposed improvements for this short � plat. ROBERSON SHORT PLAT—TIR PAGE 1 2 ❑F 1 2 4/7/2005