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Home My WebLink About02799 - Technical Information Report sw C�2�-�-�� RF �- �. �' ,� � � "'� �� AU G 1 `�' 1998 � THE DYKEMAN ARCHITt�T� � � ri1�r� � $� l� Technical Information Report (TIR) � Storrnwater Draina e g , Version 2 : Attachment to Rezone /Site Plan Approval I , � Jamie Pierre - Grady Way at Oakesdale Site Renton, Washington � � _� l Prepared for: ; � James and Barbara Pierre 11525 Lake City Way NE `� Seattle, WA 98125 I � (206)364-2200 � I � Prepared by: �,L L Gr American Engineering Corporation ,w�� 4032 148th Avenue NE � U y � � Redmond, WA 98052 (206)881-7430 I R 33t190 :i:`>,'::�= r�'_� a:_ a r O FCl�rttf9� '>�tr�,;:iy�:� �'SfON�.�G .rU�y Zi, 1998 ; b � 4 �9;�;� � EXPIRES 05-07-q� .. . ,_._if`�� ??'�r;_ -- `,r � _ 27�9 TABLE OF CONTENTS 1.0 Project Overview ------------------------------------------------------------------------------ Page 1 ?`�� , ------------------------------------ 2.0 Preliminary Conditions Summary ----------------------Page 1 J � � j 3.0 Offsite Analysis ----------------------------------------------------------------- ------Page 2 � 4.0 Detention and Water Quality----------------------------------------------------------------Page 2 � 5.0 Conveyance ---------------------------------------------------------------------------------- Page 5 ') 6.0 Special Reports and Studies------------------------------____________________��__w__page 6 7.0 Basin and Community Planning Areas---------------------------------------------- ..��1 --------Page 6 8.0 Other Permits ---------------------------------------------------------------------------------Page 6 '� � ----------------------------------------------------- g 9.0 Erosion and Sedimentation Control Pa e 7 � 10.0 Operation and Maintenance------------------------------------------------------------------ Page 7 �� List of Figures � Figure 1. Site Location Figure 2. Existing Site Conditions Figure 3. USGS Quad Map � Figure 4. SCS Soils Map Figure 5. Offsite Condirions Figure 6. Developed Site Condirions �� , Appendices �� A endix A Ci of Renton Draina e Easement/Le al Descri tion PP tY S � P Appendix B. Waterworks Calculations Output/Pipe Sizing Nomograph/Water Quality Swa1e Design � Appendix C. Operation and Maintenance BMPS � I ` ` ; ii I � 1 � 1.0 Project Overview � James and Barbara Pierre own the subject site which is located at the NE corner of the intersection of SW _.� Crrady Way and Oakesdale Avenue SW in the City of Renton, Washinr�ton. (See Figure 1: "Vicinity Map".) The owners are in the process of applying for pernussion to rezone the 2.74 acre property from CO to IM so that it may be developed for use as a car rentaUsales facility and a gas station/mini mart. The site was partially developed during the fall of 1997 under City of Renton Fill and Grade Permit #B970552. , Fill was placed on the property to bring it to the approximate elevation of the adjacent road. Storm , 'I drainage conveyance facilities were installed as indicated on the plans approved by the City of Renton. A ! ! separate Technical Information Report was submitted, reviewed and approved under the Crrade and Fill Permit. l� This TIR dated June 1, 1998 is a modified version of the previous report which now includes the s ecific �I P development proposal for the project site. The proposed site plan has been reviewed by City of Renton � staff and their comments were discussed at a pre-application meeting conducted by the City of Renton on I March 27, 1998. See City of Renton Pre-Appiication File#98-24. This report has been prepared as a � support document for the Rezone and Site Plan Approval and most importantly, as support for the ' project's Public Works Construction Permit Application. Drawings and application for construction ' permits will be submitted shortly after Rezone and site plan approval. I lThis report contains information defining the now existing stormwater system components which were ! J constructed to enclose an open drainage channel and the proposed stormwater system which will collect, � treat and convey stormwater flow generated by impervious surfaces associated with developed site conditions. This report is in conformance with the drainage requirements of the City of Renton Department of Public Works, Utility Systems, Surface Water Section. The City of Renton requirements � for stormwater system design are a modified version of the 1990 King County Department of Public Works Surface Water Design Manual. c � 2.0 Preliminary Conditions Summary � The subject site consists of six separate tax parcels all owned by James and Barbaza Pierre, which have beeM at one time or are currently encumbered by easements for railroad, high voltage electrical transrruss�on lines and local storm drunage conveyance. The railroad grade had been previously vacated � and was leveled as parc of the 1997 Fill and Grade activities. Three sets of electrical power lines cross the subject site. The owner is currently negotiating with Puget Sound Energy to underground the eadsting east-west low voltage distribution lines and relocate offsite the north-south high voltage transmission lines + which may create a potential clearance problem for future site development. Undergrounding and � relocating electrical lines will likely occur in August or September of 1998. Most of the work will be performed by Puget Sound Energy. � �� w S ; � i � ; � Y °„� A I N G I��: T p �_�� J� , � a ( �---�__ � � I , .�- _ . _ _ , ` in I - -�s;.:�::�:___— = Q � �I- �„JI� r-�.,. I'�I '� _ : V � Q� �" �I '� a�� Z �` ' � �i; o . ;ry 3 � , _--" � -- m ---- ---_------ ai3 O � � �� , y J �i , ti o __ il � s; , , 3 � Q = .o ' D " 4 0 , � � ; --------- �I�I �1 � N I��t .,''� � m ; � ; 2 3 I 1 � , �-l; r' i r J i � ; � � � 3� �. D T E C .H N . � '!� It ` ' 1 : Z : : • '� ; cn 12` �`' m 12) I��(�K el�G 19 � ) c � ,. + z 5w c Q = � ' ' --_ ---- � , � � ,,z�. I�'r� ;� Q � �, Y L � � �.� s.eo�c-ee �. F---- � : �, � : � �� a � __ •+i J{ :.I . . � i�i7:• rl S "------- • .' ___"_ .. . r, ,I �e ro � .Ji — � � < I—� '�� W -� a Q o ; /. �. m CObIIKERC7AL-LIGHTWDUSTRIAL � O � � ___ � , O F- _.� , J ,o � E � � �E R � � a � Z ti � isi __� ...__ _� � — I m;I� �-- ..�:�_.. _, J .. ...�� . 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''�T-7-�'� ,�ll � I 1 CITY UNIVERSTI']' � i� ' , 6 51+1J � � � n`� 3 .J101�I�31 1.1 T. - r� ,n��p 9 S_� _ -�r�/R �� 6b J '� . yj.�1 � � �rrl R' � I�� 1�� oJ. I' . �122 2� sl'L i t�. 1 � p 9I6I7 I 1 4 ir �� N �p a �� .:; -� u�n�r�s W ..r .- ��I,�R M��n1ul I__� _�� 6, 'u *�. � Q i 2a ^II , - ., I � :. . � � , o..:: ... ..�� ':Si .... .... .. ..:........:.:..:.. . '�o- '::'::::�.�..' ,r ' �." . ..�.'.::.'.�::..:�•........... ... . .. � � �1 _' '_ .. ....... ......:.�.::.. ..,..�.:... . �jNrE.RSra7:�.-�-. 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' �i� � --- x�---- - -7 �-i� � ��-ir-r_- �---� ;�� '� --�.!�"`- ----a r--=-- ------t-- '- J ..,� � ;1� \ --��-- V ---- -�- ----1.'_ vs-� �I ni:- -----� � -- �_ = F �' -T1'-- �� -�7 � `a• �7 . � �'iI r r�� .._ ► rox� �; �-`�- t' ----_�7 �; � , .__.,_ Q �T� Pierre-Grady Way Site '�� -' � `.'� Technical Information Report � '� � - - �� _ �- -C= � ,,; �\ - P';T Site Location Figure 1 "i `� _`t�r_=1 -- i The City of Renton has an exist�ng easement for the storm drainage flovv�ng from east to west through the ,� subject site. (See Appendia A "City of Renton Drainage Easement".) A formerly open drainage channel was, for the most part, enclosed during 1997 fill and grade activities. Storm drainage facilities installed as part of 1997 fill and grade activities included : � Two parallel 48 inch diameter culverts to convey east-west stormwater flows in City easement Four 60 inch diameter manholes to access the 48 inch conveyance system One large vault which provides access to both 48 inch culverts � 100 lineal feet of a grassed water quality facility at the north property line adjacent to Oakesdale , The water quality facility is 100 feet long and has a grassed bottom width of 3 feet. The sides consist of rock filled gabion baskets. This facility was approved by both the City of � Renton and The Washington State Department Of Fish and Wildlife. The 2.74 acre site is presently vacant; contains no impervious surface improvements; and is covered with sparse grass. The site gently slopes from east to west at a gade of about 1%. As previously mentioned, the existing onsite drainage conveyance facilities were constructed as part of 1997 fill and grade activities. (See Figure 2: "Existing Site Conditions".) Except for the non leveled area beneath the north-south electrical transmission facilities, the entire site and adjacent parcels are categorized as flat. (See Figure 3, USGS Quad Map.) Soils located beneath the 1997 fill are identified by the U.S. Soil Conservation Service (SCS) as Ur-Urban Fill (See Figure 4, Soiis Map.). As indicated in the Grading and Fill Final Close-out Report, a majority of the material placed on the project site contains an elevated clay content which is moisture sensitive and likely unacceptable for foundation support. Localized soil investigations � are recommended in the viciniri� of each proposed structure to determine the soil treatment and foundation design parameter� The Hydrologic classification for stormwater runoff calculations has been detined througn site exploration and testing of the fill which was placed on the project site. The stormwater calculations will utilize � Hydrologic Group C. Onsite drainage patterns indicate most existing surface flow drains into the constructed water qualit facility. Topographic survey indicates the existing sidewalks constructed as part of SW Grady Way, Oakesdale Avenue SW and Powell Avenue SW street improvements drain to e�sting drainage collecti� systems within the city streets. There is also appro�cimately 0.23 acres of grassed area within the City o Ren`ton right-of-way from which surface flow drains into the onsite water quality facility. No other off drainage flow appears to enter the subject site except for that w?�;�h }c ��n?�P�.��? �^m ��r *� �.t.A.,* �� ' 48-inch subsurface culverts. (See Offsite Analysis, following.) 3.0 Offsite Analysis Offsite contribution consists of mostly undetained surface flow from a 44-acre upstream basin whic} the site via twin 48-inch diameter corrugated metal pipe(CMP)culverts under inlet control with projectin� ends which have the approximate capacity of 35 CFS each flowing two-thirds full. Surface flow from the , project site is collected in the existing onsite 48-inch culverts and exits the site combined with offsite flow via one 66-inch diameter CMP culvert under inlet control with projecting end section which has the approximate capacity of 80 CFS flowing two-thirds full. Offsite areas contributing flow to the existing ' onsite system are shown on "Figure 5 : Of�'site Coaditions". The offs�te areas of contribution were delineated by American Engineering Corporation and verified on March 20, 1997 by City of Renton staff � �� _ __ .� _ .,�., _ _ _ . � '" .� _ - � �...,., - - �' -------, —' ... ��=' """, .."'! 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MUO, N019E MITIl3AT10N ' " °o ti , ��-�'��- �� ' C � ; 1 � ' _ L I IF CRADINC ANO �IAPACTON ACT�iT1ES '.:.?EATE UNACC£P?At3LE rr y r'•. a� �' �`,--.�%�/' rrtY� � ' �=,_.4�� - �+: ; � � }� �� ?..��YE'S JF DUS7. NETT7NG OF THE �tWNO MLL�E UTIUZEO =IXt DUST 1 � �'��I ��—'�� / �../`� '+�� l 3ENTAl A(�NCY • t{t . � �� , , CONTiOI.. 11U0 tMLL 3E CON1ROlLEJ YAh! ;�E INST.LLIATIQ� � Ks �.� ��`, ~ � j . �j �} � . �� E��R - . J�� ;� ROCK :ANSTRUC:tON EDITRANCE /�'�IT PAD aN0 CF�Y$P2ET CLEANYdG. =1 �,�. ~•�•� ��'� f /�y � ' N Y� � �U_TURE SPAC£ �� • a�� r �+ � 'i �� 1 A carsntucna� �qSE w1LL 8E ri1TNW NORt��I?ARAuETERS FOR '- � 'j •��' ~ F]OS71NG OVQtHEAO a�r � m v�S � t=5040 SOFT) " �—�` : �� .r \ ; '� M OE1if1_0?MQIT OF A COIAYQ2CJAL 5lTE i �a ,a� �� r uNa ro eE vucEo.ciwE�9Fir� '� u+� I _- � �-- t ` , �pco. / �� 6 �� r + , 1 IN 10 fT Y� EAS�IQR/ � Jh� ,`Y . WI � r �: � � • � v�� r � y� ' •j '�%� ' t''--�- '� �;� � -„r ' ,� PROP03ED ACCE85/HAUL ROUTES � `� ��•� ____�--� � _ :; r' �,,�,�/ '�.•�—': _ � , 7 'r, r �.� �� ,N�,�� / � CONS�RUCPON aC� ANO RE1AOVAL OF�CG1VATID WA7Ei�lAL ��. � � �_F •� � IS PROP�JSED OFF OF CItADY WAY. IT IS IKeY TiiE �CCAVAiFD \ � rt, _r��__-. �� : 1�, � ± `� . tS�+" � i � MAT�t1Al NM.L BG HAl1L[C TD 'HE SCU7H �lh CRAO�WAY_P5T f 'R � Y� � Z �' 1 -cV 50 �� AHD 9Uilq:1G MABTERIALS 'MLLA��UKfl"9E 8R J�T FRp�/�EN7 I ' ��g7 � (�l1 ` 1- ,� ' � 1 � 2 i� � ��' �� SOU1H 'M 4WY 167 NCRTH ANO 7HEN G2AOY WAY NE57 iHE SOl1RC£ 9 f 7 � ,� t '£ \ _ ° S� _ ! r�.� � ¢�a.y'�y �' � a�� i� � ' UKEL7��MAR�M T�HE 5%UaiEFi�SED ON 7fiE?40.kC'9iE 'MLL AL50 � � - :� ; .�� • � � � I � L ` � •� � f' ,� �� ', =�,�1�3/��c�non ��c.�� ESTIMATED EARTHWORK ' ! � �/3 �1 �/' � -� a / \ VE�� - ��-f GOIERAI SIIE GRADING FOR BUIIDINCS. ?AYENEN� . � }� ' r _ � �° �,�%,yi� � d'x12� Hs�nnT TFE a AND tANDSCAPE AREAS 5NLL CETIERAiE APPR070MAT�lY � •l � � ° �Q1i E� DIP 4N0 NEW FlRE HYDRMIT � � � � � S f�. \ v � / �{ 40p0 CY EXCAVATION. 5600 CY GRAVEL IMPOR7 AlMJ 7E1.EPHONE RI ` AKE G'7r1NEC,lON TO E�S71NC MAW � NATURAL CAS�IE7Q� �� 1 ' / � � / '^MTrI qTy. APPR070YAiELY JJS CY OF TOP SOIL �3E IAIPORifD. � ; g QECTRICAL P01ER � 1 �1\' ��e � °��' `, � �j � ANY AR�Cf THE 57TE AHICH w1LL NOT 3£'NORKQ �\ =M�� 14� ON 'MhiIN 15 pAYS pF GRAQING COMPL£710� .WUS7 HE 1 , , �� / HYDROSc'EDE� .1N0 VECETATiON MA7NTAINEO. �_ � � _ W lt . \ � t'�o, ��a � / �/" �J �Il/WATER SFPARATOR }1 I � � ` •� ai��' �' � '' / wni ocrotiore sHuro� PpOPOSED CONSTRUCTION DATES ! ' / � �(�I�` SANITMCONNE�CT�� X}�`�� -0 P�� asmc or�g� �c�a��sr�reunav �JNES fiUNNING / ,�.�r� , �j � g� EAS'-.YES7 TD BE PIAC� UNDERGROUND �11MIlEft 199& wfir f�t''' O0S71�C NOR7H-$QUTH TR/W5{p$SION L'NLS iJ BE �ELOC.1iFD i / � 1 i�' ` J/4"DOIAES7IC OFP SIiE SI1MMEi 1998. PROPOSED URUT�S 7D 9c CWiSTRUCTED ! � l� WATER SERVIC£ MEfER SPRING 1994, 7ROPOSEp BUILO�NCS ANO FA�E?IENT iU BE � iP pEVIC£ 10 BE CCNS:Zt1C1ED SUYMfR 1999. OC^UPANCY TMCEic,D FOR / � a -NSTALLfD aEiN�E...TN SERNCE AUCUST 1999. y% NEiER AFQ BULpING CONNEC•^•GV S / ' i0 ODSIINC MAIN ar arr � /� � oF a��. i z `� � � ! , a+u+r�c xxF 13 0 73 9 �� K ' . t� , 7 Nf71�50 FT. . I Pierre-Grady Way Site Tecluucal Information Report ' � Developed Site Conditions - Figure 6 z (Paul Lumbert and Mike Dotson) through the use of"As-Built" record drawings. American Engineering Corporation then performed field verification after meeting with the city for systems not clearly � documented in available city records. � Upon exiting the subject site, drainage flows west through 1891ineal feet (LF) of 66-inch CMP culvert (S =0.47%) beneath Oakesdale Avenue SW. At this point, additional surface flow from approximately � I 9,400 SF (0.22 acre) of paved area is collected and added to the total conveyance volume. The 66-inch ! CMP outfalls to a 20-foot wide by 40-foot long rip rap pad. The rip rap pad reduces flow velocity and erosion potential when surface flow from the 47-acre total basin joins the P-1 (Springbrook Creek) I Drainage Channel. At this location in the channel, it appears the P-1 may convey surface water runoff from several thousand acres to its outfall near the Metro Renton Sewage Treatment Plant. There have been no reports of recent flooding or overtopping of the P-I Channel at this location. Please note that � � regional stormwater detention facilities have been constructed within the P-1 channel, and detention for this project site is included in those regional facilities. � The following assumptions were used for offsite basin flow volume and modeling: No upstream detention � 25% landscaped surface cover at Cn 86 75% pav�mpervious surface cover at Cn 98 Time of Concentration (Tc} calculated to pomt of inflow to subject site. � 4 0 �etention a�d Water uali • Q h' JAlthough stormwater detention for this project site is provided in a downstream regional facility and no on- � site detention facilities are required, stormwater flows for existing and proposed Pierre-Grady Way site � conditions will be presented for general information. Flows have been calculated using the Santa Barbara Urban Hydrograph(SBIJFi)Method and King County Rainfall Distnbution Curves. l The City of Renton normally requires that post-development stormwater flows exiting the site for the 2- � year, 10-year and 100-year, 24hour storms be limited to the pre-development 2-year, I O-year and 100- year 24hour flows. Again, the detention storage volume required to meet these flow reduction standards � is pcovided offsite. The WaterWorks computer program was utilized to calculate the pre- and post- developed flows for the site for informational and comparative purposes. The King County rainfall � distribution curve is contained in Selection 6 USERl in the WaterWorks rainfall distribution selection parameter. The following information was used in this analysis: � DesiQn Storm Rainfall Intensitv 2-yr, 24-hr 2.0 inches/hour � 10-yr, 24hr 2.9 inches/hour I 25-yr, 24-hr 3.4 inches/hour l 100-yr, 24-hr 3.9 inches/hour ! Soils Hydrologic Group "C" Runoff Curve Number "CN': LandscapelGrass 86 � Pavement 98 � 4.1 Existing Conditions Information Onsite Total Area = 2.97 Acres (includes City land which drains onsite) Impervious Area = 0.0 Acre CN= 98 Vegetated Area = 2.97 Acres CN= 86 � Time of Concentration"Tc": = 13.32 minutes (See Appendix B) Offsite Area 1 Total Area = 4.63 Acres Impervious Area = 3.50 Acres CN= 98 Landscaped Area = 1.13 Acres CN= 86 Time of Concentration"Tc": = 16.95 minutes(See Appendix B) Offsite Area 2 Total Area = 12.60 Acres ', Impervious Area = 9.45 Acres CN= 98 Landscaped Area = 3.15 Acres CN= 86 Time of Concentration"Tc": = 31.75 minutes(See Appendix B) Offsite Area 3 Total Area = 26.9 Acres � Impervious Area = 20.2 Acres CN= 98 Landscaped Area = 6.7 Acres CN= 86 Time of Concentration"Tc": = 54.73 minutes(See Appendix B) Ot�'site Area 4 Total Area = 0.22 Acre Impervious Area = 0.22 Acre CN= 98 Time of Concentration"Tc": = 7.27 minutes (See Appendix B) 4.2 Existing Conditions Flow Results (See Appendix B for WaterWorks output) ' Onsite Flows (Entire Site) DesiQn Storm Eaisting-F1owRate 6-mo, 24hr 0.33 cfs 2-yr, 24hr 0.52 cfs 10-yr, 24-hr 1.07 cfs - 100-yr, 24-hr 1.74 cfs Ot1'site F1ows (For Capacity Verification,25- and 100-yr, 24-hr) AREA 25 YR 140 YR Offsite Area 1 3.00 cfs 3.50 cfr Offsite Area 2 6.59 cfs 7.70 cfs Offsite Area 3 11.16 cfs 13.05 cfr Offsite Area 4 0.23 cfs 0.26 cfs 4.3 Developed Coaditions Information Development of the Pierre Grady Way site is proposed in three phases. The Grade and Fill phase was �::� completed in the Fall of 1997. Rezone and Site Plan Approval is currently being sought. Upon Rezone and Site Plan Approval , application will be made for building and construction permits. . � The site development proposal includes a gas station/mini mart to be located on the southwest comer of the site and a car rentaUsales business to be located on the most northerly parcel. The remainder of the site will either be paved or landscaped A preliminary site plan is included in this report as Figure 6,"Developed Site i Conditions." The estimated quantity of new impervious surface area under proposed developed conditions is 4 approximately 91,040 sq. f�(2.09 acres),which is equal to approximately 76 percent of the 2.74 acre project _-� site. � 4.4 Developed Conditions Flow Results (See Appendix B for WaterWorks output) Onsite Flows following Site Development , Desi�n Storm Develoaed Flow Rate 2-yr, 24-hr 1.09 cfs � 10-yr, 24-hr 1.71 cfs 100-yr, 24-hr 2.41 cfs � 4.5 Detention System Information � The purpose of stormwater detention storage is to alleviate downstream flooding and erosion whi:.h may result from increased surface water flow attributable to the introduction of impervious surface areas. The 2.74-acre project site location at the end of the drainage sub-basin suggests that detention storage may be ineffective. If I site runoff were undetained following introduction of 76%impervious area,the 100-year, 24-hour rainfall event � would equate to a suh-basin stormwater flow increase of 0.67 cfs. It seems unlikely that this amount of flow ..� increase would result in adverse downstream effects. Existing dovmstream conveyance systems have the capacity to receive this nmoff and as previously mentioned, detention storage is provided downstream The downstream storage facility was constructed as part of the Spnngbrook Creek relocation pro�ect. The detention � basin and pump system aze located approximately one-quarter mile downstream. With this information,the City i of Renton determined that no onsite detention is required to be constructed as part of Pierre Grady Way at 'i � Oakesdale site development. Please note that the existing drainage easement granted over and across tfie subject � site to the City of Renton also waives detention requirements for this site. (See Appendix A,Drainage � Easement,Item#13) This report provides technical substantiation for this waiver. ,� 1 4.6 Water Quality System Information It is the intent of the owner to provide surface water quality treatment for onsite surface water flows generated by areas subject to vehicular traffic. Design of the water quality faciliries will be in conformance with Department of Ecology Stormwater Management for the Puget Sound Basin standards. The proposed site plan includes a gas station and a rental car/car sales facility which will include a vehicle wash room. Both the gas station and vehicle wash room present"water quality" challenges because they aze � subject to chemical and hydrocarbon exposure. If stormwater surface flow containing these pollutants is not properly collected and treated, potential adverse onsite and downstream water quality impacts could result. For these reasons, and in conformance with discussions held with City of Renton engineering staff, all surface flow from the gas station pump islands, underground fuel tanks and vehicle wash room will be collected in a cement concrete trench (detail shown on construction drawings), run through an oiUwater separator, and then discharge to the sanitary sewer. An in-line shut-off valve will be placed at the outside of the oil water separator vaults for emergency shut-off purposes. Both the gas station pump island and the vehicle wash areas will be covered to minimize the collection of rainfall, since flow from these areas will dicharge to the sanitary sewer. The vehicle wash room is proposed to be a room integral to the rental car building, approximately 20 ft x 20 ft in size, into which vehicles will be driven and washed by hand using a standard garden hose. The room will be equipped with a central drain that discharges to the sanitary sewer as described above. Total 90,740 square feet of proposed new impervious surface azea includes; 11,680 sf building rooftops � 3,850 sf pump island canopy and fuel tanks 400 sf covered vehicle wash area(overlaps pavement) 75,210 sf pavement The surface flow from building rooftops will be collected and conveyed directly to the enclosed tw-in 48 inch diameter storm drainage system. Surface flow from the pump island,fuel tanks and vehicle wash azea will be collected, treated and discharged to the sanitary sewer. Surface flow generated on 68,000 sf of paved area will be collected and receive water quality treatment in grass-lined swales to be constructed adjacent to SW Grady Way. Swale#1 (most easterly)will be designed for surface flow water quality treatment from approximately � 15,000 sf of paved surface. Swale#2 will be designed for surface flow water quality treatment from app�oximately 53,070 sf of paved surface. Surface flow from 7,200 sf of proposed pavement near the mini mart which cannot be collected and conveyed to proposed Swale#1 or#2,will be collected and conveyed to the existing stormwater vault which outfalis to the existing grass-lined gabion-walled swale near the west property line. i :r :� � Swale# 1 Design Information (Please See Appendix B for Water Quality Swale Design Calculations) 6 month-24 hr water qua(ity flow � '! 100 yr-24 hr flow �fr ' Swale bottom width feet � Swale depth(with 1 foot muvmum freeboard) feet 6 mo flow depth feet ' 100 yr flow depth feet � Swale#Z Desi n Information lease See A endix B for Water uali Swale Desi Calculations g � PP Q tY � ) � 6 month-24 hr water quality flow �� 100 yr-24 hr flow �� -- Swale bottom width feet � Swale depth(with 1 foot minimum freeboard) feet 6 mo flow depth feet � 100 yr flow depth feet � � 5.0 Conveyance System Analysis and Design �, � Stormwater conveyance faciliries installed in 1997 were sized per City of Renton standards to conve both the Y offsite and onsite surface water flows through the subject properry. Normal design parameters indicate that � culverts should be sized at a minimum to cenvey the 25-year, 24-hour event The pipe and surrounding system shouid then be analyzed for flooding during the 100-year, 24-hour even� No flooding of public streets is allowed Some onsite surface ponding occurring as the result of the 140-year, 24-hour rainfall event is allowed � by the City,but is reviewed and a�proved or denied on a case-by-case basis. A conveyance system sized for surFace water flow from both on-and offsite developed conditions during a 100. � year, 24hour storm event will be designed and constructed on the Pierce Grady Way site. The total flow which must be conveyed is as follows : � , Offsite Area 1 100-yr,24-hr 3.50 cfs Offsite Area 2 100-yr,24-hr 7.70 cfs Offsite Area 3 100-yr,24-hr 13.05 cfs 1 Offsite Area 4 100-yr,24-hr 0.26 cfs Onsite Developed 100-yr,24-hr 2.41 cfs Total 100-year,24-hour flow to convey 27 CFS j A single 48-inch diameter CMP culvert sloped at 0.005 ft/ft,under inlet control,with headwall type entrance has a capacity of 40 cubic feet per second(CFS)flowing two-thirds full,which is more than adequate for the calculated 100- � year,24-hour flow conveyance requirement with no overtopping. Existing stormwater conveyance facilities which flow onto the site are twin(2)48-inch diameter CMP culverts (total flowing two-thirds full capacity of 70 CFS). The downstream existing 66-inch CN[P irilet c:ontrol,projecting entrance has a flowing two-thirds full capacity of about 80 � CFS. Both the existing upstream and downstream systems appear to be greatly oversized. It is assumed that the additional storage available exists for flood storage. For system consistency, as part of the filling and grading activities, the owner continued the existing twin(2)48-inch diameter CNtP culverts through the site to provide a twathirds full Icapacity total of 80 CFS matching that of the downstream system. 1 i J , � 6.4 Special Reports and Studies ' Five reports have been prepared relating to the Pierre Grady Way project site in addirion to this Stormwater � Drainage Technical Information Report: Geotechnical En ' eerin Investi arion American En � eerin Co ration A ril 1997 1 � Gradin and Fill Close-Out Re ort American En ' eerin Co oration Feb 1998 Environmental Assessment Environmental Hazazds Control Se tember 1996 � Wetland Verification Re ort John Comis Associates Se tember 1996 Storm Drainage Technical Information American Engineering Corporation April 1997 Re ort : The Geotechnical Engineering Investigation report makes recommendarions with respect to existing soil properties,placement of fill material on the site, and foundation and slab design parameters. The Grading and Fill Close-Out Report indicates that fill was placed on the project site and includes material testing information. The Environmental Site Assessment was prepazed to address subsurface investigations at and in the near vicinity of the old railroad grade. No Environmental Hazards were identified on the subject site. The Wetlands Report was prepared by a wetlands specialist to verify the presence or absence of wetlands on or within 100 feet of the subject site. No regulated jurisdictional wetlands occur within the specified study area. These reports were previously submitted to the City of Renton with the Grade and Fill Pernut application. 7.0 Basio and Community Planning Areas The project site is located in City of Renton Grid Section 4324 NE 1/4. The City ofRenton has an extensive set of as-built records pertaining to water, sanitary sewer and storm drainage systems that utilize this gid system. This site is entirely contained within the Black River Drainage Basin. The Fierre Grady Way site is located within the City of Renton Comprehensive Plan Employment Area-Yalley (F.AY} designation. The EAV designation is intended to provide ior a mixture of commercial,office and industrial uses. The proposed gas station and auto rentaUsales uses fall within the range of uses indicated for the EAV desi�ation. . 8.0 Other Permits - To the best of our lmowledge,the following permits/actions are required for development of dvs site: Rezone SEPA Determination for Rezone and Site Plan Approval Site Ptan Approval Engineering Plan Approval _ Construction Permits -Utilities and Sitework Building Permits � _ _ 9.0 Erosion and Sedimentation Control ' Erosion and sediment control during site filling, grading and construction will be accomplished through the use I - of Best Management Practices BMP's as outlined in the"Stormwater Management Manual for the Puget Sound ��, Basin," (SWM). It is likely the BMP's will include t�e installation of silt fencing at the site perimeter, stabilizing ' � exposed soils and revegetating ti�e site as soon as pracricable upon completion of grading. It is proposed that the r- � filter fabric fencing remain in place and be maintained until site development activities including landsca�ing , ' have been completed Erosion and sedimentation control measures also include provision for the cleaning of city streets if they become dirty as a result of construction activities. The contractor will be required to wash and/or , 1 sweep City streets on a regular basis throughout sitework and building construction. This will m;n;m;7e siltation � in downstream facilities. Please refer to civil drawing sheet 2 of 11 for proposed Temporary Erosion and Sedimentation Control. � :;� 10.0 Operation and Maintenance � The manner in which project related drainage facilities will be maintained is described in table form in Appendiz C,"Operallon and Maintenance BMPs." J _S� 1 . li '`� � .,� �.. �� . � � l �� _ � � � _ �,,i � � . . Appendix A j Existing City of Renton Drainage Easement J :� ..� l �� , =:1 - _� � ., � � �-� , _ _ _ __ _ _ � � � ��.. , I . '/ , . ' f � ..'� ' y �.....- h ' � . '^�.'•��•J�.+Ia .e....... .. \ . . . .. � �` � ..-.��_ i1_`^��'T� ..f_ _ , a �� .�. :. � � _ _ . " . ` ----' - . . '� � ` _ .:- D N � ` "'. -6.00��di��C I .� • AGREEMENT aND EP.SEHENT' �QR DRAI2�AGE �" . . �� ' �_ .. : . - � . • 1'HIS AGREEMENT made. this �� da}• of �,�,__�r.1985; ' f - ' �-��=-.-.•':•:�.�. � • I _. between PUGET wESTERN, INC.: a WashinQton corporayion ( Puget � : . . .� � Weatern" herein), and CZTY OF RENTOi7, {"Gcantee" her� .n); : ' � wHEREAS, ?uget western is the owner of a parcel of :and in � i• • � � �_ the N.E. 1/4 of Section 24, T�wnship 23 �orth, Ra�qe S East. .. 1 i � , ' ' �; W.M., Ring Coonty, t�ashinqton; and � �. � �: WHEREAS, Grantee desires an easement for a drainaqe channel _� � � : . � zcross Puget western's land at a location more specifica2ly . . described hcrein below; � '1' ,i0'R THEREFOR�, in consideration� of Ten Dollars (S10.00) and • ' 1 other qood and Valuable consideration in hand paid receipt of ' L which is hereby acknowledged, and in consideration of the �- � perfo*raazco by Grantee of the covenants, terms and conditions ^ � ��\ a hereinafter set forth, Puget Western hereby grant�, .conveys and = . ; K�'f-� � � qu;tclai�s to Grantee the following easement: t •` � • � ..� i L ' � . ,` � : . � :�fi� = I��; Qj A. A nortexclusive perpetual easement across, alortq, in, � ap upon znd under that portion of Puget western s land describeci in � j � �� !� Exhibit "A" attached hereto and by this reference mads a part ; �-�` �` I;` he:eof, for the purpose of installinq, constructinq, ooeratinq, , 0 � � ��: maintaininq, removinq, repairinq, repZacinq and using a drainage = { L" � +: channel with all connections and _:�derqround apourtenances ' 1` .riF � L� i � thereto (herein the "drainage channel") , toqether with the ;� � ,Q�.� ,� � � ! nonexclvsive riaht of inqress to an� eqress fran said portion of i� - � v n., � Puqpt western's land for thc foregoing purposes; .� ' � The terms "Easesnent' and "Easement Area" in this znstrument . % � 0� i refer to the easement on the property descr;bed in Exhibit "A'. : • � � This Easement is qranted subject to and conditioned upon the � � � folloWing terms, conditions and covenants which Gsantee hereby ' j ! ' i promises to faithEully and fully observe and perfo�. ' i. � `� 1 � ' ` ` 1. Cost of Constructior, and !!aintenance. Grantee shall � , , bear and pranptly pay a 1 costs and expenses o£ construction and � ! � : maintenance of the drainage channel. � , I ( � ' 2. Comoliance vith Laws and Rules. The Grantee shall � � � construct, maintain an use t e rainege channel in accordance '. � � ' i aith any statute, order, rule or requlatior. oE any public ' ' authority havinq jurisdictfon. � � � ! � � 3. Us� of the Easement Area bv Pu et western. Pu et ! • ' � • Western reserves tha right to de�elop and use the lanc�s i � ' encu-►bered by this easement fot any purpose not fnconsistent with ' � the rights granted herein. Puqet Western reserves the riqht to const=uct im rovements, such as buildin s, arkin and � ��'7 i I ; P 9• P 9 � '� � ! landscapinq, over portions of the Easement Area upon securinq the . � : consent ef Gcantes, which consent Grantee aqrees shall not be unreasonably withhcld, ha•�ing due regard to Grantee's faciliti.es. ' � E ' In no svont ahall Puget Western be allowcd to construct a . '� I '1 � ' buildirg at qrado over the box ci:lvert. - � Puyet Hegtern shail not be ii3blc for any loss or dnma qes to I� . � : Grantec's facilities resulting fran Puget Western's sae of the �I �_i . u,. lands encu.nbered by this easement unless such loss or damage is � � � dua to neqlfgent acts or asissions of Puqet Western. puqet � ' w Western aqrees to uae reasonable care. :.� I� E' � � i � 4. 'Serm:nation for Cessation of Uso. Zn tho event Grantea I ; � j ceaaea to nse the dra naqe chan-el for �ta intonded use for a _ �'� ! .�oC poriod of five (S1 suceeasive yeera, thia llpteement.;and all" " , Gtanteo�e riqh�s heceunder shall terminate and revor� to Puqet ' I : � ! � �ydWestern. • ; f i � a-� :--,:--�.,-.. ..-- : . � � ; ��', 5. Rei¢ean of Dta ina�Chennal on Termination. 1io== �: '`i i ' , �. - . , ., _ �t Ination of tn s Aqreament aha rolesae Crantee from atfy .- - i ; � � ��:��bility or obliqatlon with roa ect.to.ony matter occurrinQ•��•=•w� '. - . r , � � �1��i . �. ..._ .� � � ' ' � I . . ; r ' C� sa'�.:�i:� '... -• . ,-• • :-AM-602� 32195 s � : . ! i � �/��lGl,�A.�/._ ;;,;,q � , �s � : E •:: -�"..~--~-- -„�� r, � . .� _,__---_ ......._......- . .•_. -----�-- .. _ _ - � . ....:.-'"_��.::'___..,. � �; ' I �! . - _ . _ � ., ��ZT 1 i r d � , : _ � � .I .. k ' . J'v <t. \ � �+ti � v`I �� • � ,�.... . -. .: ' .. ... , . . . . .. . ... . . - � - .� �ti »� . r• � t �t. - .. _ -�'� � ' ��• � =1\ ...ti' . : .:•. r .i%�, ,:. :��'':`;.=.�.-. . _:. ,�rr� ..`, � . .j_�s:•ti£; ��' ,� � � .-;�;':y` - - prior to such termi:ation, nor ehall such terminatiun ralease � -• �'=�=��'�•� • � 'i;;.`� '=1<':� Grantee from ita obliqat:on and liability to renove�the drainape ' .�, :� - �'�' �:r��': � . - c5anne1 faciliGies Eran PuQet Aeatern s parcol and _eetora the � ,w.�. �� : qround. � � -. •.3;:.+;_ ;' S • '__,:;-':-`-, f� �� . 6. 3enoval of Drainaae Channel on Termination. Upon any • f � � ter.r,ination of thls Agreement, Grantee sha�l promptly remove from ; � -. . . -� t:`.e Easement Area the drainaqe channel :acilities and rastore the � . ground to tne coldition now existing or, in the alternat:ve, take ! . - - '� such other mutually agreea512 measures to minimize the impact of � ,� . ��' the drainaqe channel on Puget Western's Property. Such vork, " 4 � - -- ' r2tnoval and rescoration sh�ll be done at the sole cost and - • ' ' � _ •expea�e af Grantee and in a manner satisfactory to Pugat tdestern. � " - Zn case oE failure of Grantee to so r2nove the drain�ge channel � : � fac3lities, restoze the grcur.d or take cvch ocher mutuil2y aqreed � . B upon measures, Puget We�tern may, after reasonable notice to � . : _ - Grantee, resnove the drainage channel facilities, restore the ' _ � ground or taY.e such measures at the expense of Grantee, and Puget � " � Western shall not be liabie therefor. S _ - . f . � - - . � 7. Thi1'd Par�v Riahts. Puget Western reserves all rights , �" �� v;th :es?ecr tc i.ts oroperty including, without limitation, the � �1 rignt to qrant easements, license� and per.aits to others subject : � to the ri�ht> qranted in this Aqreement. � � �;y""' �� d : 8. Re2ease and Indenni�. �rantee does here�f release, � �.;� ;j � indemnify an promise to etend and save harmless Puqet Western � " � • � fran and against any and all liability, loss, cost, 3amaqe, ► � _.. L� ezpense, ac:ions and claims, including costs and reasonable �; �' � attorney's �ees °ncurred t�•� Puget Western in defense thereof, , ' � . asserted or arisinq directly or indirectly on account of or out ' "- _ � � � . � oE (1) acts or omissions of Grantee and Grantee's servants. " � � agents, enployees, and contzactors in the exercise of the rights � . � � : qranted herein, or (2) acts and omissions of Puqet Western in its ' _ . � f, use eE the property which affect Grantee's employees, agents. � � contractors, aad otner parties benefitir.q from said drainage - . � � � cnannel; proaided, however, this paragraph does not p�rport to � ,� indemnify Puqet YJestern against liability ior damages arisirq out ? � �� of bod�ly injur.v to persons or damage to property caused by or � .� � � � ►• resu2ting frcm the sole negligence o£ Puget 4:estern or Puqet = � � f� Westera's aqents or employees. : .� : 1 I � '• --- + 9. Title. The riqhts granted herein are subject to •; � � � - 'i peraits, leases, licenses and easements, if any, heretofore -� ' , qranted by Puqet t�estern a�fecting the property subject to this �` :. - EAqreement. Puget we�ter� does not varrant *itle to its property � and shall not be liable for de�ects thereto or failure thereof. . . i � I0. Notfces. Unless otherwise provided herein, notices �•:f requized to Ae in r+ritinq unc;er this Aqreement shall be given as � � • follows: � '. .. : . ( .' If tc Puget Western: puget Western, Inc. • � � � � P.O. Sox 0868 � •' � ! " � � Bellevue, Wast��inqton 9B009-9734 ' i. : Zf to Grantee: Cfty of Renton - � f ; 200 Mill Avenle South . . ' � Renton, WA 96055 � �, Attn: DirRctor Public �torka ' � i . � • No�ices st,all be deemed eEfoctive, if m�iled, upon the ' � i :! second day followinq deDosit thereof in the United Statea Hail, �� Dostaqe prepaid, cettifiad or registered mail, return receipt . requasta4, or upon dxlivory th9reoE if otherr+ise Qiven. Either Derty may change the address to which notices may be qiven by . , qiviny rtotice ae ahove �rovideA. ' . ' Succqasora. the riqhte anC obliputiona of the parties � ; .� udall innra to thv benofit oE and be uindinq upon thair � zesp�ative successora and assiqns. • ' • : .:..,`:__:s Y��:�-. : _2_ � • . :;,y"'.:.3/.J.iZ ". � - 11M-5023 32I85 • 1 fdr : � ._ ;s".i:�,._.'.:'t.•.: ,' � i � . _,�h�`��.1�{'. , � ; ' 1 � '.�_i'_,:�",.�.._„ ... �_ � i . r ,�� . " ,-� ' � ��.% Oo _ . ' _ . . _ r ' { j �' _�� i i F�� . '":\ . .._ .. " "' . _. .. . .. � ' ._ ._.. ._.....�, . .�C�-1. i _ .� . � .; ��. . ...._ ; _ _ I • � t � :� � . .. :� i . J ,',.� l 12. Ltability. In the event oE any aeeipnment o! �he • � �.i ' _ riqhts heruvnder, the liability of Grantoe and i�a aesipnoec • • , �.,�_�.;::':-`_: � :• �', ahall be join� and several. -- :"`i .'-. ._ . - ` ._ 13. Releaso of DrainaCe Re`ention RoAuiremontts. •.;rentee • •• � � �"' - ahall telaase Pupet t�eetern fran future ArainaSa cetonE_on, . • � • � � canponantinq atocaqe and flood p:ein requiremenee and/or • � � restrictions as ralated to Puqat Western'a adjecen[ property. : � • . �� EXECUTED as of the date hereinabove sRt forth. � .. ' � . •? ' ACCEPT:.'D: . '. l .-� CI;Y OF RE*1TON PUGET +JESTERN, INC. � �- • . � B -;�S�.L�! By ' _ . - • � _ _. . y � . . . -.. ,..:�.. . . Y v �ce President ' i __ : �.� - . -� - : . � ; . . ; �� ' � � STATE OF WASHSNCTON) � l. �� ) SS. r ' C .COUNTY Op RING ) E Q� ►�' " � . I �j On this �(r�day of ►�u;1 , 1985. be_ore me, the { . 1 Q undersiqr.ed, persoaally aQ�eaCed r7N. K. �RTHUR, to me kr.�vn to be � � . i � ti:e Vice President of PUGET taESTERN, INC., the rorporation that � � . '� -: • � ezecuted the .oregoing instrursent, and acknowledqed said F - . 1 ,instrument to be the free and voluntary act and deed of said f i ccrporation, for the uses and purposes therein mentioned, and on t -1 _, •oath stated that he is authorized to execute the said instzvmer.t. i J �� wiTNEsS my hand and official seal hereto affixed the day and � l � year above rrritten. � � ' ) : : � ' � � ��. ; � No�ary public and for Xhg�,rState of i � : � .}� � washinqton, re ding at �X�C1� . ' f e � � J � � � f .. :� �;>- : � o� �� , � � � i & . . �' .-'.�, . _ i, i � W �� . � . ` � � � � • .N � : � �C. � a•. ?l.l�... t � � i . ..$..4� . } . � � f � i . 1 � � i � i . � { i if � � � ; � . E�� f � I { I - � " ' � , ' • � � -3- � . AM-6023 32185 • - � i , � . - ' t ' 1 • " . ` ',._. .. � . I •+.i._��:.:.._. . .. �. _... . _._ .. � . � .,._, _ �� / ��• i�%'/ 1 �- �� _ - �. - ,� . .:. , �. ..� :�� - _ � � . ......_........_....._.....,.:..,... � .. .:.... _= ' . ,� •:�•:� . -. . _ . .. . .. _ . . , . . `. ,.. _ '",h„ "1 _ . _ ' r�J � � "_ y ti� - 1 �- ' -�' . � i�� . . � .�� I .S'` 1 �� ",�� . - . . . . , ' J f _- .. _ .{:i ' : . • . � . ' _ - . i ,- --- _ �t, . � .. . - - � -- EXiiIHI': "A" : . I . ::�,� . I � Legal tor pera=nent drainage easemen: - Puget Western - Tax - . . _ . � �• . �arcel 9. • -� ' .'rd . � � . �',..a'� A pa=esl ot land being 100 Seet in width being 5� Seet on each � - side oi Lhe iollowing described center?in2 aa�� its northerly . ; � . �=` a�3 southerly extensions xll �ithin Section 24� TownshSp 23 . � =� No.th, R�age 4 East, W.M., ; � Beginning at �he intersection o_ ihe Ea�t iiae of the Sou:haest i _ ' • ' , quuter o1 the Northeast quarter oi �aid section aith the nor�herly � � - � rignt oY way lize oi SK Grady Aaq; thence southwesterlq along � � - snid aorther�y right of way li�e a distance o2 312.09 feet to the True Point of Beginning oS said centerline, thence North � � _ � 33°20' 7Jest a distaace oi 138 Seet more or less to Puge� Sound t Power & Li'ght Company's soutSPrly right oi waq line and the ; . . � terminus o1 said centerline; � - . � � � TOGETHER 4JITH a psrcel 01 land 120 feet in width being 60 feet � _ ,� � oa each side o1 the Sollowinq described centerline and its northerly E � � and southerly extensions all within Section 24, Township 2� � �- . . � y Nor'h, Raage 4 East. 7P.�., ` _ • . O F � � � Beginniag at the intersection ot the East line cS the Southwest � � quarter o1 the Yortheast quarter of said section with the southerly � . _ right of way line oi SW Grady Waq; thence soutawes�erly along ; � said southerly right oi ovay 11ae a distance oi 249.57 leet to � � the True Point o1 Beginning oS said centerliae; thence South i � 33°20' Ea�t a distance ot 150 ieet more or less to the northerly _ � r-ght oS way line ot S.R. 405 and the te�rsinus oi said centerl?.ne; ; : � e TOGETHER WITH a trangular shaped parcel of land lqinq aorthwesterly ; ;! 01 the tollowing described Iiae; , � Begianing at the intersection ot the East line of the Southwest _ � . � auarter ot the Northeast quarter nf Section 24, Township 23 , North� Range 4 East with the norcherly right o1 way line of �� SW Gradq �ay; thence sosthwesterly aloag said aortherly right . F- oi way 12ne a distance of 261.2? Seet Lo the easterly margin of the previously described 100 Soot easement; thence North � •- 33°20' West a2ong said easterly margin a disLahce o1 T6.73 ieet ' � to the Point oi Beginning of said liae; thence northeasterlp to a. point on Puget Sound Power � Light Company's southerlq !. fight o1 way and tbe Lerminus oi said line; said poist bears � ► Soutb 75°4?' �9est a distance o1 265.0 Seet Srom the iatersectioa � 02 said sou�herly rlght oi waq line aad the East 11ne o2 the • 3outh�est quarter ot the :Iortheast quarter of said Section 29. In City oi Renton, County o1 King, Statc oI Vfas6ington. • � ; 1 • : �.c:_ -. .. ltla/p . . . . � . • •� . • :�.. ,- . . . . i., . . . � � . 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Qwt[�[�! f�Ct{m I�. TowM�O 77 rot[L. It�nq� � WC. Y.H.. lA �'-� R1117 �JwcY. wsall�Ka1. .n�en O��f� �ws11 o•t1•l�- �K SS�.1 LNC . :[O�CN :bKI1M�C �Of�l�f aI CM MYLM��C QII/lC1[OL [1N OOIC��YC aw[u[aC ��td S�cClon 2{I cM�c� .e.cn o•iS•)0• ut lJ�.l� f��c [e�pstnC: cn.we.so.cn ts•tl• ..�c us t«c aro.u�a wrell.t ce ce� wou r��wa► :lw�e[ Cn� rtqK•o!•.q af r�1A bwten er��ea oC cM . `w b�lLMf�1K1L1C R�11wT. I.J�S.27 C��C CO� pOIK O� CM NK �lY • oC ��W f�cCten I�� C7 c�.nc.aorsn o•ts• ...c il�.» C«c ce cn. leur..etfe.et ce.we C� 1lM Ol Nl0 fKG1M 7� rIll1 CM �WCI�u�ty►Nl lLM O( Cd � t�'IK�O�•wr O� N��IKM pt�11C11 O( C1M MtC�[11 ��C1�1C ��lry� Mttll ��0 y011K OC IKIi��CC1ow ll�/ 17• fNC �OrC11 O��!' w�C L�O� O CDI 11D[CM��C CO[Mf OL LM q�[M�K �1�R�[OL [M MRM�K (") alu[C�f )[ I�tO!K[lon IIr cs�nc� cs�lo.�eq ..�a .e.cn rryfiut tin�eC cM rtMcwf-�.y K tlr ` � R�weon�r.nen o( cn.Msrel�.rn ►.etfle�atl��y ro.e� 7a•tl• ..�s 1.7N.s (+�c co tM 01�c�o! DptmlM� ,�� -� [=CS7T CIYf yOfCIM tY[q1 IrtM��t�flr O� LN��t�r{Y 1(M�( � ►e��lt �www]wcn�+�c ..cew.�rN ce cM Us►o[ �•ween by Wit CLt�O�M r�eeraM W�r R�eorOtM��7H1NSso� IKt�O•�c1w ot 6�a 1�[ [LIr►Cawcy Let Llw� L vc�.wc . b. N�-�l t�CINW�W�t��eofOlM 1MrO�f �7�7)�fN�l. �,� � � � � 1 I O�� . � ttYtl�b�� p� InRlel�� . � . ._.�_._.�.�._._ ___. .__.__._. --•_--•____..__�_ �.,.: •. ,:�� '� � / � C C , .�_�� _ . . . 't4'>�, , . " " � _ � c,, _ - �- � .� � � .;� -. EX}iIBIT'A';Continued) P11RC�L C: . ^uc rorcion ot th• �ouchw�c quarter of t�a norctfea�c quarC�r oL S�e[Son 3t. Tovnihlp 27 YosUf. tan4� 1 Ea�C. N.M.. ln Rlnq COua7Y. - warh�pqton. d��crlb�d a� Lollo�r. B�qinainq at ch� �ou[hw�c corn�r ot •aid ooucE.n�c Qu�rtar. . . .n�..�� rorte o•SS•13' •arc alcnq cr� w�c �iC�, lu.17 :��c co W _ . poinc o1 D�qinnlnq oC cM craec ot tana n�c.an ducri:sC� • �` cGanc• norch 77•29'22' •uc �]�.5f f��c to an laurs�ccion vicE clf� . • . _, . norcn•rly �cyln o[ cM W4�[ Sourd El�ttric 0.allroad ncnC-ol-�av: . � � , _ eh�ne� :wrchu�uily alonq �aid noril•ily w�zqin �n •rc dl�canc� oL ' � , . � • :7a.1� Ce�c co a poinc o[ ung�nry, :�• radLl lln� ot rnich D..r• ' sOuth 12•)0•!�' •a�C Coc 1 Ci�Cafle� o: 7�1.l1 :o�C CO Cl1� iadfal cencer: :Rence notth 7�•If'13' u�c alonq ■aid nor[heily macqln G72.�i :��c . � to :1� cu[ezly lin� ot aud soutave�t Quaziet; - ' ehenee not[N 0•�S'27' easc alonq sa�d euc ltn� 25.f! L��C Co [h� aouc��zly �acqin o! ch■ tbrceern 7�citte Rulroad [1qAc•oL��y: - chenca aouCh �T•2)'12' w�c alanq •aid �ouch�rly nurgin 1,11e.S� ' - t��c co a polnc o1 eucra, Ravinq + r+dlu� af 905.15 Ga�t. ch� ndlal . eencrr ot �nlcn bu rs aoucA t3•)0•��• suc; � ch�nce soucMe�cerly alooq saad cvrve anA souch sarqin an azc • . � diacanee oC 261.:1 taet co ao snc�raeecson ricn cM .e�c lln� of . ' •aid aou[tiveac Cuar[sc: • . � cnence soucR o•55'12' resc ]�.5] Nec co che poinc ot beqinnloq; __ FJC�TT thsC portaon cb�reoL lyinq �eacerly ot cC� euc�rly Lla� oC � ��. � ' Oakuaale Avenue Sou[n�uc +a eoaveyW co c�� Clty ot Reacon by daed - �- • r�coraed under ,�ecorEloq Nueoez �71:oio�)�. � � CJJtC3L 0• � �, A •cz►p o( land SO Ce�C ride, b�fnq 3S !e�[ Ln vidch on e�cb sid� ot • ' a eeaterlln� o= dstinice loeac:on o! :ne Se�ccle-Taeos� Lncerurban xall�ay (+�w Juq�c Sound Slecccie uilrayl Aencon �raneh, on, ov�r, , uro.• uid cArouqh ctuc ceruan :0 aere craec ot tana alonq cM . norcSerly sade ot ch• nonnw�c �varter ot cE� awcRe��c quaster and -- pacc o1 cYs norcAea�e qwner ot :De aoucnea�c quartar oC Seeuon i� - in �ovn�hlD Z� yarth. �4e + oasC. a.N., ia Rinq Councy. . . . wa�ninqcon. and che soucnresc Quarcer oG th� norcheasc Quarcer oL �aiG Seccion 2�, cM cencerlans being aore �arcieularly deaeribed a• Collov■: � . i�qinnieq ae !he poiac o[ ine�nsecion oE cA� c�ncer:in� of ch� � . dst:aice loeacaon ot cA� aencon �rancl oC :ne Saaccle-Tieo.a ZncenrDan Ila3lvay lefor Pvgee Sovnd 2leecr:e Railwyl vlch cM �ouW line of _!:e 10 aCze CtacL Cese=:DeG aDove vhich ba�ra �ouCh 29•�1' ' �.e�c 2f�.7 :eec Lzo� Che ceneer o[ Seccaon 2�, Tovnshap 23 Noruf. � �qe � Easc. N.:f.. ln Klnq CouncY. M�-.11nqcon: . � . . chence In � norchea�terly dlreccion a■ Collov�: . . .:�i Nrvina w tha :efe by a ndiw ot 7ti.♦ teec a dlscane� ot 21a.] � :"� :ee[ :o ♦ poin[: �.j Clfenee mrCh 77•17• eu[ 7l5 :eet [o • polnC: � -Aence cur�trq co cM :iqhc Sy a raCiu� ot 71f.3 te�c, a di�cane� o! _ SI�.G _�sc co a potn[: .� Q etsence nort6 7i•t]' ease :�5.2 :�ec :o a �o1ne oR cn� �a�c lin� ot � � � :�• souClfve�C puatc�r of Cr� noscn�asc qu�rt�r oC S�c[lon I�, � �., Tornani0 il Morth. R�nqe � u�c. a.r.. in Kinq Councy. w��hlnqcon. � vhlch �ar• souch 0•15' �uc G07.5 hu Croe t�� norcMuc crorn�r ot- � � Ch� �ouchw�C Qu�[Cev oC [h� nocCh�a1C Qua[[�s oL S�e[Son 3�. � �7 . To�n�hip 27 Ibrch, Ilinq� ♦ i.��[, M,fi., !n Klnq CounCy, MUMnqCon/ � ,.� i7CCLPC U+ac porCion Ch�[eet lylip wsterly oC c�• •••c�rly lin� oC O�k�idllt AWIW� SOYC11r1�[ �• CO.lv�yb CO CM CiCy OC R�ACOrt bY 6��d . zecoraw wd�r R�cozdfnq awwr e7tsotot7�. f1UtG'EL �s � i�qinninq ae • potne on ch� euc boundary lln� o[ th� �wc8w�e pu�rur o! cL� norcBea�e Qu�rur ot S�eclon 1�. Tovn��lp 2] Ibrcn. �iiv{� • 4�C, N.N., !n Rlnq Coun[y, Muhinq[on. .hiGf 1■ wuch 0'SS'lo� �ue G)].21 t��e Lro� cn� norcM.�c eorn�r oC c�� ouclw�K qua[C�r o[ Cb� noCChu�[ Qu�t[�C oL ��td 9�CClon ]�r c�snt• ow a cOu[�� Ouch 7�•17' w�C slonq ch� �Ouch �Oundary 11n� . . o[ GM )vq�[ louM El�c[Ilc R�llr.�•• rlqnc•oCw�r • dl�cane� o[ 1i7.�! CMCI Ch�ne� on � eour�� wuc� U•N• ��aC a dl�une� oC lf (��ti [Mnc� on • cout�� nortb �i•SI• �ut • dl�unc� o[ 11)J� t��ci [b�ne� on • eoun� norcD 0•tJ')0' ..�K • Al�une� ot t).Sa C��[ Co C!M polnC O[ WqlM111q. ' . �nh18�� . PowoR • • �nitlab _� _ 4 �: �. . • ,`F`� ' �Y�ti::L1:'�". .� "F . .. •�. .rl�' �.l•••.i '�'�1 / . . . . - .r. e� �: :-.- . .+.. �. . . . �- . r�:f--.. . . � . . • ' / / :1' .:.� , , .� _ � . , "' ,..a -� .�.� �,.....;� _ , _ � ��:`. �...r� �...ti..� ::___ _� {-�.��' � -_:,_�, .... .:��a �' � - . .. � � PnvEn _._, IPERTY w PI�RCEL � /' PNRKQVG LOT �' � _ PF�PE�27Y L.1rE5 � � .-, ./ O r V 6� ' a � U An w��,j " ' f,,� � �vv Iv� TS /CurV�..r� ..t' r� � �� 3� sEr ,,��. ,,,,��--�j �m � ��`� ' �g � � � � d f � SEE � � DETAI�� . �... . i � . P/1PoC�G .34 ARE.�'� / L[GHT � POI..E D � ❑ Q� � PAPoQNG �RE� ' P�RCEL.� A ur�mr � 15 UTYITY POLE S]GtWL A C��"j[�" BCIX O � O • : u U_1TY ' �r �—� c° � �� r� � � PARCEL B , . 16 s / � `��i � } i � Appendix B � Waterworks Calculation Sheets 1 .� _-� � 1 -1 � . � _ -� .� � �� I 5/28/98 American Engineering Inc page 1 i PIERRE GRADY WAY SITE � EXISTING STORMWATER FLOWS I CLG --� BASIN SUMMARY ----- � BASIN ID: EX10 NAME: EXISTING ONSITE 10 YR-24 HR I SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .97 Acres BASEFLOWS: 0. 00 cfs ` RAINFALL TYPE. . . . : USERl PERVIOUS AREA � PRECIPITATION. . . . : 2. 90 inches AREA. . : 2 . 97 Acres . ' TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86 . 00 TIME OF CONC. . . . . : 13 . 32 min IMPERVIOUS AREA 1 ABSTRACTION COEFF: 0.20 AREA. . : 0. 00 Acres � CN. . . . . 98.00 TcReac�i - Sheet L: 70. 00 ns: 0. 1500 p2yr: 2 . 00 s: 0. 0600 �-� TcReach - Channel L: 570.00 kc: 17 . 00 s: 0. 0070 I TcReach - Channel L: 30.00 kc:21. 00 s: 0. 0070 TcReach - Channel L: 30.00 kc: 17. 00 s: 0. 0070 i , � PEAK RATE: 1. 07 cfs VOL: 0. 39 Ac-ft TIME: 480 min BASIN ID: EX100 NAME: EXISTING ONSITE 100 YR-24 HR SBUH METHODOLOGY � � TOTAL AREA. . . . . . . : 2.97 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : USERl PERVIOUS AREA PRECIPITATION. . . . : 3 .90 inches AREA. . : 2 .97 Acres _� TIME INTERVAL. . . . : 10.00 min CN. . . . : 86.00 TIME OF CONC. . . . . : 13. 32 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . . 0. 00 Acres CN. . . . . 98. 00 1 TcReach - Sheet L: 70.00 ns: 0. 1500 p2yr: 2 . 00 s:0. 0600 TcReach - Channel L: 570.00 kc: 17.00 s: 0. 0070 TcReach - Channel L: 30.00 kc: 21. 00 s: 0. 0070 �l TcReach - Channel L: 30.00 kc: 17. 00 s: 0. 0070 j PEAK RATE: 1.74 cfs VOL: 0. 61 Ac-ft TIME: 480 min :� BASIN ID: EX2 NAME: ONSITE EXISTING 2 YR-24 HR SBUH METHODOLOGY �TOTAL AREA. . . . . . . : 2.97 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA 1 PRECIPITATION. . . . : 2.00 inches AREA. . :. 2 . 97 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86. 00 TIME OF CONC. . . . . : 13.32 min IMPERVIOUS AREA � ABSTRACTION COEFF: 0. 20 AREA. . : 0. 00 Acres CN. . . . . 98. 00 TcReach - Sheet L: 70.00 ns: 0. 1500 p2yr: 2. 00 s:0. 0600 TcReach - Channel L: 570.00 kc: 17.00 s:o.0070 �� TcReach - Channel L: 30.00 kc:21.00 s:0.0070 TcReach - Channel L: 30.00 kc: 17. 00 s:0.0070 PEAK RATE: 0.52 cfs VOL: 0.21 Ac-ft TIME: 480 min I ., 1 5/28/98 American Engineering Inc page 1 PIERRE GRADY WAY SITE DEVELOPED STORMWATER FLOWS , CLG BASIN SUMMARY BASIN ID: DV10 NAME: ONSITE DEVELAPED 10 YR-24 HR SBUH METHODOLOGY - TOTAL AREA. . . . . . . : 2 . 97 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0. 88 Acres , TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86.00 TIME OF CONC. . . . . : 11. 28 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 2 . 09 Acres CN. . . . . 98. 00 ' TcReach - Sheet L: 55. 00 ns:0. 0110 p2yr: 2 . 00 s: 0. 0200 TcReach - Channel L: 470. 00 kc:17.00 s: 0. 0050 TcReach - Channel L: 30. 00 kc:21. 00 s: 0. 0050 , TcReach - Channel L: 210. 00 kc:17 . 00 s: 0.0050 TcReach - Channel L: 50. 00 kc:21. 00 s:0. 0050 PEAK RATE: 1.71 cfs VOL: 0.58 Ac-ft TIME: 480 min BASIN ID: DV100 NAME: ONSITE DEVELOPED 100 YR-24 HR � SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 97 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . . USER1 PERVIOUS AREA � PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0.88 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86. 00 i TIME OF CONC. . . . . : 11. 28 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 2 . 09 Acres � CN. . . . . 98 . 00 TcReach - Sheet L: 55. 00 ns:0. 0110 p2yr: 2 . 00 s: 0 . 0200 TcReach - Channel L: 470. 00 kc:17 .00 s: 0. 0050 TcReach - Channel L: 30. 00 kc:21. 00 s: 0. 0050 TcReach - Channel L: 210. 00 kc:17. 00 s: 0. 0050 TcReach - Channel L: 50. 00 kc:21.00 s: 0.0050 PEAK RATE: 2 .41 cfs VOL: 0.82 Ac-ft TIME: 480 min BASIN ID: DV2 NAME: ONSITE DEVELOPED 2 YR-24 HR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 97 Acres BASEFLOWS: 0. 00 cfs 'RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0.88 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . :. 86. 00 � TIME OF CONC. . . . . : 11. 28 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 2 . 09 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 55. 00 ns: 0.0110 p2yr: 2 . 00 s: 0. 0200 � TcReach - Channel L: 470. 00 kc: 17 .00 s: 0. 0050 TcReach - Channel L: 30. 00 kc:21. 00 s:0.0050 TcReach - Channel L: 210. 00 kc:17. 00 s:0.0050 � TcReach - Channel L: 50.00 kc:21. 00 s: 0. 0050 PEAK RATE: 1. 09 cfs VOL: 0.37 A�-ft TIME: 480 min � 3/27/97 American Engineering Inc page 1 PIERRE GRADY WAY SITE j OFFSITE BASIN 1 FLOWS � CLG ; _� BASIN SUMMARY BASIN ID: 01100 NAME: OFFSITE BASIN 1 100 YR-24 HR SBUH METHODOLOGY ' TOTAL AREA. . . . . . . : 4. 63 Acres BASEFLOWS: 0.00 cfs � RAINFALL TYPE. . . . : USER1 PERVIOUS AREA •�� PRECIPITATION. . . . : 3.90 inches AREA. . : 1.13 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . . 86. 00 TIME OF CONC. . . . . : 16.95 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 3 .50 Acres � CN. . . . : 98. 00 TcReach - Sheet L: 50.00 ns: 0. 1500 p2yr: 2 . 00 s: 0. 0050 TcReach - Shallow L: 200.00 ks:27. 00 s:0.0050 -.,� TcReach - Channel L: 500.00 kc:42.00 s:0.0050 PEAK RATE: 3.50 cfs VOL: 1.30 Ac-ft TIME: 480 min � BASIN ID: 0125 NAME: OFFSITE BASIN 1 25 YR-24 HR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 4.63 Acres BASEFLOWS: 0.00 cfs �� RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 3.40 inches AREA. . : 1.13 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86.00 ..� TIME OF CONC. . . . . : 16.95 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 3.50 Acres CN. . . . . 98. 00 TcReach - Sheet L: 50.00 ns:0. 1500 p2yr: 2 . 00 s:0. 0050 � TcReach - Shallow L: 200. 00 ks:27.00 s:0.0050 TcReach - Channel L: 500. 00 kc:42. 00 s:0.0050 PEAK RATE: 3.00 cfs VOL: l. 11 Ac-ft TIME: 480 min � � �, , ,.3 1 .� ] � l 3/27/97 American Engineering Inc page 1 PIERRE GRADY WAY SITE � OFFSITE BASIN 2 FLOWS CLG BASIN SUNII�IARY BASIN ZD: 02100 NAME: OFFSITE BASIN 2 100 YR-24 HR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 12. 60 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA ' PRECIPITATION. . . . : 3 .90 inches AREA. . : 3 . 15 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 86. 00 TIME OF CONC. . . . . : 31.75 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 9 .45 Acres CN. . . . . 98. 00 TcReach - Sheet L: 50.00 ns:0. 1500 p2yr: 2. 00 s: 0. 0050 TcReach - Shallow L: 400. 00 ks:27.00 s: 0.0050 ' TcReach - Channel L: 850. 00 kc:42 . 00 s:0. 0050 TcReach - Channel L: 800. 00 kc: 17. 00 s:0.0050 PEAK RATE: 7.70 cfs VOL: 3.53 Ac-ft TIME: 480 min BASIN ID: 0225 NAME: OFFSITE AREA 2 25 YR-24 HR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 12 . 60 Acres BASEFLOWS: 0.00 cfs � � RAINFALL TYPE. . . . : USERl PERVIOUS AREA PRECIPITATION. . . . : 3. 40 inches AREA. . : 3 . 15 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 86. 00 � TIME OF CONC. . . . . : 31.75 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 9.45 Acres CN. . . . . 98.00 TcReach - Sheet L: 50. 00 ns:0.1500 p2yr: 2 . 00 s: 0. 0050 TcReach - Shallow L: 400.00 ks:27. 00 s:0.0050 TcReach - Channel L: 850. 00 kc:42. 00 s:0. 0050 TcReach - Channel L: 800.00 kc:17.00 s:0.0050 PEAK RATE: 6. 59 cfs VOL: 3.02 Ac-ft TIME: 480 min , 3/28/97 American Engineering Inc page 1 PIERRE GRADY WAY SITE OFFSITE BASIN 3 FLOWS . CLG `] BASIN SUMMARY I BASIN ID: 03100 NAME: OFFSITE BASIN 3 100 YR-24 HR , j SBUH METHODOLOGY � TOTAL AREA. . . . . . . : 26.9a Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA �' PRECIPITATION. . . . : 3.90 inches AREA. . : 6.70 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 86.00 TIME OF CONC. . . . . : 54 .73 min IMPERVIOUS AREA - � ABSTRACTION COEFF: 0.20 AREA. . : 20. 20 Acres CN. . . . : 98. 00 TcReach - Sheet L: 50.00 ns:0. 1500 p2yr: 2 . 00 s: 0.0050 I TcReacM - Shallow L: 350.00 ks:27. 00 s: 0. 0050 ', � TcReach - Channel L:2800.00 kc:42. 00 s: 0. 0050 TcReach - Channel L: 1700.00 kc: 17. 00 s:0.0050 PEAK RATE: 13 . 0 cfs VOL: 7.54 Ac-ft TIME: 490 min '�I � BASIN ID: 0325 NAME: OFFSITE BASIN 3 25 YR-24 HR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 26.90 Acres BASEFLOWS: 0. 00 cfs � RAINFALL TYPE. . . . : USER1 PERVIOUS AREA I PRECIPITATION. . . . . 3.40 inches AREA. . : 6.70 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 86. 00 "� TIME OF CONC. . . . . : 54.73 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 20.20 Acres CN. . . . . 98. 00 � TcReach = Sheet L: 50.00 ns: 0.1500 p2yr: 2 .00 s:0. 0050 TcReach - Shallow L: 350.00 ks:27.00 s: 0. 0050 TcReach Channel L:2800.00 kc:42. 00 s: 0.0050 TcReach - Channel L:1700.00 kc:17 . 00 s: 0. 0050 � PEAK RATE: 11. 16 cfs VOL: 6.45 Ac-ft TIME: 490 min � • � � l l. I �: l �� - �. � � � � i � � � c�� . � a� p [ � 5•� n � N �. ! S�c� � � l : � � � sQ � � � � �.� � t. �:: t;.. ��.:� rrt�: 1: . �:: * C� l:, .�(�'�sNo� � . N�d �-�S �� n ��o� �o �.: �. � � ' �::� (_ � �� E � �.;: , . � � � 3/27/97 American Engineering Inc page 1 � PIERRE GRADY WAY SITE � OFFSITE BASIN 4 FLOWS CLG � ____________________________--_______________________- BASIN SUMMARY � BASIN ID: 04100 NAME: OFFSITE BASIN 4 100YR-24 HR SCS METHODOLOGY TOTAL AREA. . . . . . . : 0.22 Acres BASEFLOWS: 0.00 cfs j RAINFALL TYPE. . . . : USER1 PERVIOUS AREA y PRECIPITATION. . . . : 3 .90 inches AREA. . : 0. 00 Acres TIME INTERVAL. . . . : 10. 00 min CN. . . . : 85.00 � TIME OF CONC. . . . . : 7.27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0.22 Acres ' CN. . . . . 98.00 TcReach - Sheet L: 70.00 ns:0.1100 p2yr: 2 . 00 s:0. 0200 i PEAK RATE: 0.26 cfs VOL: 0.07 Ac-ft TIME: 470 min � 1 BASIN ID: 0425 NAME: OFFSITE BASIN 4 25YR-24 HR SCS METHODOLOGY � TOTAL AREA. . . . . . . : 0.22 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 3 .40 inches AREA. . : O. 0 i TIME INTERVAL. . . . : 10.00 min CN. . . . : 85. 0 ) TIME OF CONC. . . . . : 7 . 27 min IMPERVIOUS AREA ABSTRACTION COEFF: 0. 20 AREA. . : 0.� � CN. . . . : 98. 0 TcReach - Sheet L: 70.00 ns:0.1100 p2yr: 2 . 00 s: 0 PEAK RATE: 0. 23 cfs VOL: 0.06 Ac-ft TIME: 4;0 :��:: 1 � . � I I l � KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE�i.3.5D HEADWATER DEPTH FOR CORRUGATED PIPE CULVERTS W/INLET CONTROL °�_ :, ieo � ��o,000 ! a,000 t�) I , 168 EXAMPLE � ' IS6 .6,000 0•16 tncnn(�.o h�r1 6 t2� I 3,000 0•66cfs �3, I 144 4,000 Mw' Mw 5. 6. i ENTRANCE TYPE � � i32 3,000 � tt..�� 6. � � �� .a e.. 5' HEAOWALL P�AN � 120 " . W 2,000 ca 2.� s.3 S. � � 4 a (3) 2.2 6.6 108 j ' 4 3. 4. � i J 'D ie t�H � � �, Q � � � gg � I,000 3, � � I " 800 3. ' � , '� 84 n 600 2 �1) 500 ) aoo -- -- - — MITERED TO 1 72 � 2• 2. CONFORM W 300 /� � TO SLOPE I � �n / _ �'s SECTION � I ? v 200 � I z 6O � Z �,f►�� Q I.3 i.s / �' —� II c �' 34 � o w � �o j/� � _ �2� a � � i 4J 48 � 80 0 > � _- 6� 4 ? PROJECTING " a2 �' So CL� � �.o �.o - SECTION � � � G�., • . — � � a0 A� Q i.0 � �6 30 W " ENTRANCE ac ' W j�y ,� SCA TYPE W � � `%�-�� Q .9 , 0 33 20 ��(Il�8�� o .8 .g �� 30 (2l w� an rm a � �o .� '�7 W .e � �3) x � J p 2T 10 l31 Proj�et�nq � .T .T a � 8 c � 24 6 .7 � S �. Fof� �P�R-o�c ��3 � To rs�scol�(21 or(31 vro��ct �� 1 ^�• 21 q �wixontell� ro scol• (ll,tMn 6 1.✓ os• straia�t inclin�d lin� r�:ou'� '6 �. p`P� 3 D one o sco��s, a rn�+i� as _ _ -_ _.. _. 6 � te �ii�.��e,... 2 - IS � .5 '� IA _S � � (dc" u�� = So G�5 �CPs�G�-� (Z/ wu-) ! — �2 � ' � ! 4.35-12 1/90 : Appendix C � Operation and Maintenance BMPs � 1 � � I l � � � _ � r�� i � � �i ' The applicant's proposal for maintaining drainage faciliries is listed on the following pages. � �� All onsite drainage facilities will be privately owned and maintained by tt�e site tenant, with the exception of I underground conveyance facilities that replace the open channel. These will be owned and maintained by the ;-� City of Renton. �I Facility maintenance requirements are as idenrified in the Puget Sound Stormwater Management Manual �I ,.l Appendix A, "Privately Maintained Drainage Facilities" and include: � I Access Roads/Easement � I Maintenaace Defect Conditions When Maintenance is Results Eapected When I Component Needed Mainieoance is Performed j � General Trash and Debris Trash and debris exceeds 1 cubic foot per Trash and debris cleared from 1,000 square feet, i.e.,trash and debris site. II would fill up one standard size garbage j � can' Blocked Roadway Debris which could damage vehicle tires Roadway free of debris which I (glass or metal). could damage tires. I Any obstruciions which reduce clearance Roadway overhead clear to 7 fe�t above road surface to less than 7 feet. high. � Any obstructions restriding the access to Obstruction removed to allow at a 10-to 12-foot width for a disiance of least a 12-foot access. more than 12 feet or any point restricting � access to less than a 10-foot width. Road Surface Settlement, When any surface defect erceeds 6 inches Road surface uniformly smooth � Potholes,Mush in depth and 6 square feet in area. In with no evidence of settlement, Spots,Ruts general,any surface defect which hinders potholes,mush spots,or ruts. or prevents maintenance access. ' . � Vegetation in Road Weeds growing in the road surface that Road surface free of weeds taller Surface are more than 6 inches tall and less than 6 than 2 inches. i , inches apart within a 400-square foot , area. - IShoulders and Erosion Damage Erosion within 1 foot of the roeciway more Shoulder free of erosion and Ditches than 8 inches wide and 6 inches deep. matching the sunounding road. Weeds and Brush Weeds and brush exceed 18 inches in Weeds and brush cut to 2 inches height or hinder maintenance access. in height or cleared in such a '�i; way as to allow maintenance �?�� access. 1 I Closed Detention Systems (Pipes/Tanks) � ; Maintenance Defect Conditions When Maintenance is Results E.cpected When Maintenance is :i Component Needed Performed � ;# Storage Area Plugged Air Vents One-half of the cross section of a Vents free of debris and sediment. t� � vent is blocked at atry point with �� ' ;:�: debris and sediment. Debris and Sediment Accumulated sediment depth All sediment and debris removed from ;.;:;j �' exceeds 10%of the diameter of storage area. the storage area for'/z length of storage vault or any point depth exceeds 15%of diameter. :;j E�cample: 72-inch storage tanlc would require cleaning when sediment reaches depth of 7 inches for more than '/�length of 1 tank. Joints Between Any crack allowing material to All joints between tank/pipe sections are Tank/Pipe Section be transported into facility. sealed. Tank/Pipe Bent Out of Any part of tank/pipe is bent out Tank/pipe repaired or replaced to � ' Shape of shape more than 10°/a of its design. .,, '�� design shape. Manhole Cover not in Place Cover is missing or only partially Manhole is closed. � in place. Any open manhole requires maintenance. Locking Mechanism Not Mechanism cannot be opened by Mechanism opens with proper tools. Working one maintenance person with proper tools. Bolts into frame have less than'/z inch of thread (may not apply to self-locking � lids). Cover Difficult to One maintenance person cannot Cover can be removed and reinstalled Remove remove lid after applying 80 ibs by one maintenance person. of lift. Intent is to keep cover from sealing off access to `1 maintenance. Ladder Rungs Unsafe King Counry Safety Office and/or Ladder meets design standards and " maintenance person judges that allows maintenance persons safe acc�ss. ladder is unsafe due to missing � rungs, misalignment, nist,or cracks. Catch Basins See"Catch Basins"Standard No. See"Catch Basins"Standard No. 5 , . S . ! ; � ��_�, �j 1 1 � Controi Structure/Flow Restrictor � � ';:� � Maintenance Defect Conditions When Maintenance Results E.�cpected When Maintenance is Component is Needed Performed �� General Trash and Debris Distance between debris build- All trash and debris removed. ,;; (Includes Sediment) up and bottom of orifice plate is less than i-'/z feet. Structural Damage Swcture is not securely Structure securely attached to wall and ��`�� attached to manhole wall and oudet pipe. ' oudet pipe structure should I support at least 1,000 pounds '�, �:� of up or down pressure. i Structure is not in upright Struchue in correct position. position(allow up to 10%from �, plumb). ', � Connections to outlet pipe are Connections to oudet pipe are watertight; not watertight and snow signs structure repaired or replaced and works of rust. as designed. Any holes—other than Struciure has no holes other than designed ,;�-� designed holes—in the holes. 't struCtute. ; Cleanout Gate Damaged or Missing Cleanout gate is noi watertight Gate is watertight and works as designed. ,.� or is missing. Gate cannot be moved up and Gate moves up and down easily and is down by one maintenance watenight. person. --� Chain leading to gate is Chain is in place and works as designed. missing or damaged. Gate is nuted over 50%of its Gate is repaired or replaced to meet �� surface area. design standards. I �'� Orifice Plate Damaged or Missing Control device is not working Plate is in place and works as designed. properiy due to missing,out of place,or bent orifice plate. Obstructions Any trash,debris,sediment,or Plate is free of all obstnictions and�vorks � vegetation blocking the plate. as designed. Overflow Pipe Obstructions Any trash or debris blocking Pipe is free of all obstnictions and works (or having the potential of as designed. . bloddng)the overflow pipe. 1 Manhole See"Closed Detention See"Closed Detention Systems" Standard i Systems"Standard No. 3. No. 3. Catch Basin See"Catch Basins" Standard See"Catch Basins" Standard No. 5 � No.5 , '`� � :� .� � � � � I � Catch Basins Maintenance Defect Conditions When Maintenance Results Expected When Maintenance is ' Component is Needed Performed .,A,. General Trash and Debris Trash or debns of more than '/� No trash or debris located immediately in � (Includes Sediment) cubic foot which is located front of catch basin opening. ' immediately in fromt of the catch basin opening or is - , blocking qpacity of basin by more than 10%. Trash or debris(in the basin) No uash or debris in the catch basin. that exceeds 1/3 the depth from ~� the bottom of basin to invert af the lowest pipe into or out of the basin. Trash or debris in any inlet or Inlet arid oudet pipes free of trash or ' outlet pipe blocking more than debris. 1/3 of its height. � Dead animals or vegetation No dead animals or vegetation present that could generate odors that within the catch basin. � would cause complaints or dangerous gases(e.g. methane) Deposits of garbage e.eceeding No condition present which would attract , 1 cubic foot in voIume. or support the breeding of insects or rodents. Structural Damage to Corner of frame extends more Frame is even with curb. Frame and/or Top Slab than'/, inch past curb face into , the street(if applicabie) Top slab has holes larger than Top slab is free of holes and cracks. 2 square inches or cracks wider than '/.inch(intent is to make � sure all material is running � into the basin). Frame not sitting flush on top Frame is sitting flush on top slab. slab, i.e. separation ef more ' than'/.inch of the frame from the top slab. Cracks in Basin Cracks wider than'h inch and Basin replaced or repaired to design Wa1lsBottom longer than 3 feet,any standards. ' evidence of soil particles entering catch basin through cracks,or maintenance person il judges that structure is ` unsound. Cracks wider than '/�inch and No cracks more than'h inch wide at the , longer than I foot at the joint joint of inledoutlet pipe. of any inledoudet pipe or any evidence of soil particles entering catch basin through cracks. � Settlement/Misalignme Basin has settled more than 1 Basin replaced or repaired to design nt inch or has rotated more than 2 standards. inches out of alignment Fire Hazard Presence of chemicals such as No flammable chemicals present. ' natural gas,oil,and gasoline. ;# Vegetation Vegetation growing across and No vegetation blocldng opening to basin blocking more than 10%of the basin opening. � Vegetation growing in No vegetation or root growth present. inleUoudet pipe joints that is more than six inches tall and , less than six inches apaR_ ' Pollution Non-flammable chemicals of No polluuon present other than surface more than 'h cubic foot per film. ' three feet of basin length. Catch Basin Cover Not In Place Cover is missing or only Caich basin cover is closed. �� Cover partially in place. Any open catch basin requires maintenance. . � Locking Mechanism Mechanism cannot be opened Mechanism opens with proper tools. Not Working by one maintenance person with proper tools. Bolts into frame have less than '/z inch of � thread. Cover Difficult to One maintenance person Cover can be removed by one Remove cannot remove lid after maintenance person. applying 80 Ibs. of lift;intent - � is keep cover from sealing off access to maintenance. Ladder Ladder Rungs Unsafe Ladder is unsafe due to Ladder meets design standards and allows ' missing rungs,misalignment, maintenance person safe access. � nist,cracks,or sharp edges. Metal Grates Grate�vith opening wider than Grate openings meet design standards. (if applicable) 7/8 inch. � Trash and Debris Trash and debris that is Grate free of trash and debris. blocldng more than 20%of r grate surface. Damaged or Missing Grate missing or broken Grate is in place and meets design � member(s)of the grate. standards. -� 1 1 � . l . .7 �� `�