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RS_TIR_161020-v1
Te c h n i c a l I n f o r m a t i o n R e p o r t Da l p a y S h o r t P l a t Re n t o n , W a s h i n g t o n Ou r J o b N o . 1 7 8 8 4 17884.001 TABLE OF CONTENTS 1.0 PROJECT OVERVIEW Figure 1 – Technical Information Report (TIR) Worksheet Figure 2 – Site Location Figure 3 – Drainage Basins, Subbasins, and Site Characteristics Figure 4 – Soils 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of the Core Requirements 2.2 Analysis of the Special Requirements 3.0 OFF-SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology B. Developed Site Hydrology C. Performance Standards D. Flow Control System E. Water Quality System 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6.0 SPECIAL REPORTS AND STUDIES 6.1 Geotechnical Engineering Study for Dalpay Short Plat prepared by Earth Solutions NW, LLC dated December 13, 2015 7.0 OTHER PERMITS 8.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN A. Erosion and Sediment Control (ESC) Plan Analysis and Design B. Stormwater Pollution Prevention Plan 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 10.0 OPERATIONS AND MAINTENANCE MANUAL Tab 1.0 17884.001 1.0 PROJECT OVERVIEW The proposed Dalpay Short Plat is located at the intersection of NE 19th Street and Redmond Place NE, in the City of Renton, Washington. It is also situated within Section 4, Township 23 North, Range 5 East, Willamette Meridian, City of Renton, King County, Washington. Please see Figure 2 – Vicinity Map for a more accurate depiction of the location of the site. The subject property has slopes ranging from approximately 2 to 40 percent. The northwest and southeast corners of the site are relatively flat. The remainder of the site topography consists of a "ravine" with steeper slopes down to a stream. The stream and slope are contained within an existing Native Growth Protection Easement (NGPE). Onsite soils are Alderwood which are considered to be "till" type soils and are generally not conducive to infiltration. With exception of lot 1, the entire site is covered with trees and brush. There are no existing structures on the site. The project consists of one parcel, containing a total area of approximately 1.66 acres. The proposal with this preliminary short plat is to create 4 single-family lots with associated roadways, utilities, and stormwater facilities. Lot 1 will gain access from Redmond Place NE, while lots 2-4 will gain access from Redmond Court NE. A Private access tract will be constructed for the access to lots 2-4, per City of Renton standards. The project will provide one drainage facility for the developed area at the southeast portion of the site (lots 2-4). This facility will consist of a detention vault followed by a stormfilter and will be located under the proposed Private Access Tract (PAT). An 8-inch diameter HDPE pipe is proposed to be installed to convey stormwater discharge to the natural discharge location, which is the stream located onsite. This storm pipe will be installed underground and were possible it will be installed on the surface of the ground to minimize the disturbance within the existing NGPE area. The developed portion of the site located in the northwest corner of the site (lot 1) does not require any detention or water quality. The runoff from this lot has already been accounted for with the drainage facilities that were designed and constructed with the original Dalpay Short Plat that was constructed about 10 years ago. The drainage report and level 1 for the original short plat are located in section 3.0 of this report. Figure 1 Technical Information Report (TIR) Worksheet KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2009 Surface Water Design Manual 1/1/09 1 17884.002.doc Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner Dalpay Properties LLC Phone (206) 399-6302 Address P.O. Box 2436 Renton, WA 98056 Project Engineer Don E. Dawes, P.E. Company Barghausen Consulting Engineers , Inc. Phone (425) 251-6222 Project Name Dalpay Short Plat DDES Permit # Location Township 23N Range 5E Section 4 Site Address 18XX Redmond Place N.E. Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS Landuse Services Subdivision / Short Subd. / UPD Building Services M/F / Commercial / SFR Clearing and Grading Right-of-Way Use Other DFW HPA COE 404 DOE Dam Safety FEMA Floodplain COE Wetlands Other Shoreline Management Structural Rockery/Vault/ ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Type of Drainage Review Full / Targeted / (circle): Large Site Date (include revision 9-23-16 dates): Date of Final: Site Improvement Plan (Engr. Plans) Type (circle one): Full / Modified / Small Site Date (include revision 9-23-16 dates): Date of Final: Part 6 ADJUSTMENT APPROVALS Type (circle one): Standard / Complex / Preapplication / Experimental / Blanket Description: (include conditions in TIR Section 2) N/A Date of Approval: KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2009 Surface Water Design Manual 1/1/09 2 17884.002.doc Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: Completion Date: Describe: Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan : City of Renton Special District Overlays: Drainage Basin: Honey Creek Stormwater Requirements: Part 9 ONSITE AND ADJACENT SENSITIVE AREAS River/Stream Lake Wetlands Closed Depression Floodplain Other Steep Slope Erosion Hazard Landslide Hazard Coal Mine Hazard Seismic Hazard Habitat Protection Part 10 SOILS Soil Type Slopes Erosion Potential AgC (Alderwood) 8-15% Moderate AgD (Alderwood) 15-30% Moderate High Groundwater Table (within 5 feet) Sole Source Aquifer Other Seeps/Springs Additional Sheets Attached KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2009 Surface Water Design Manual 1/1/09 3 17884.002.doc Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE LIMITATION / SITE CONSTRAINT Core 2 – Offsite Analysis Sensitive/Critical Areas SEPA Other Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply) Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis Level: 1 / 2 / 3 dated: 12/3/03 (Cramer NW, Inc.) Flow Control Level: 1 / 2 / 3 or Exemption Number (incl. facility summary sheet) Small Site BMPs Conveyance System Spill containment located at: Detention Vault Erosion and Sediment Control ESC Site Supervisor: TBD Contact Phone: After Hours Phone: Maintenance and Operation Responsibility: Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Provided: Yes / No Liability Water Quality Type: Basic / Sens. Lake / Enhanced Basicm / Bog (include facility summary sheet) or Exemption No. Landscape Management Plan: Yes / No Special Requirements (as applicable) Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. / None Requirements Name: Floodplain/Floodway Delineation Type: Major / Minor / Exemption / None 100-year Base Blood Elevation (or range): Datum: Flood Protection Facilities Describe: Source Control Describe landuse: (comm./industrial landuse) Describe any structural controls: KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2009 Surface Water Design Manual 1/1/09 4 17884.002.doc Oil Control High-use Site: Yes / No Treatment BMP: Maintenance Agreement: Yes / No with whom? Other Drainage Structures Describe: Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION Clearing Limits Cover Measures Perimeter Protection Traffic Area Stabilization Sediment Retention Surface Water Control Dewatering Control Dust Control Flow Control MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION Stabilize Exposed Surfaces Remove and Restore Temporary ESC Facilities Clean and Remove All Silt and Debris Ensure Operation of Permanent Facilities Flag Limits of SAO and open space preservation areas Other Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description Detention Infiltration Regional Facility Shared Facility Flow Control BMPs Other vault Biofiltration Wetpool Media Filtration Oil Control Spill Control Flow Control BMPs Other wetvault Figure 2 Site Location Figure 3 Drainage Basins, Subbasins, and Site Characteristics Figure 4 Soils Tab 2.0 17884.001 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of the Core Requirements Core Requirement No. 1: Discharge at the Natural Location. Response: All runoff from the developed site will be discharged to the onsite stream, which if the natural discharge location. Core Requirement No. 2: Off-Site Analysis. Response: The Level 1 Off-Site Drainage Analysis is provided in Section 3.0 of this report. Core Requirement No. 3: Flow Control. Response: The project will provide a detention vault under the Private Access Tract located in the southeast corner of the site near lots 2-4. Flow control facilities for lot 1 are provided by the original Dalpay Short Plat located just to the north of lot 1. Detention facilities will meet Level 2 flow control requirements, as required by City of Renton. Core Requirement No. 4: Conveyance System. Response: The site development stormwater conveyance is comprised of a series of catch basins and stormwater pipe network, which will convey the runoff to the detention vault located in the Private Access Tract. The sizing of this conveyance network is based on the Rational Method delineated in the 2009 KCSWDM and sized to adequately convey the anticipated stormwater discharge based on the stormwater runoff developed from a 25-year storm event. Conveyance calculations will be provided with the final engineering plans and TIR. Core Requirement No. 5: Erosion and Sediment Control. Response: Temporary erosion and sedimentation control plans will be included in the site development documents prepared for this project that meet the requirements of the City of Renton. These drawings will indicate the clearing limits, temporary and permanent erosion control measures, perimeter/off-site protection (silt fence) along the downstream edge of the site, construction traffic stabilization (rock construction entrance), and other pertinent temporary erosion and sediment control measures. Core Requirement No. 6: Maintenance and Operations. Response: In accordance with the City of Renton and the 2009 KCSWDM, the stormwater facilities will be privately owned and maintained. An Operation and Maintenance manual will be provided with the final construction plans and TIR. Core Requirement No. 7: Financial Guarantees and Liability. Response: Financial guarantees will be sufficiently instituted to cover the cost of correcting, if necessary, incomplete or substandard drainage facility construction work and to warrant for 1 year the satisfactory performance of the newly constructed drainage facilities or any facility that will be assumed by the City of Renton for maintenance operation. 17884.001 Core Requirement No. 8: Water Quality. Response: As dictated by the 2009 KCSWDM, the Basic Water Quality Protection Menu must be followed for this project. This project is proposing to meet the stormwater requirement by installing a Stormfilter just downstream of the detention vault. Sizing calculations for this treatment facility will be provided with the final construction plans and TIR. 2.2 Analysis of the Special Requirements Special Requirement No. 1: Other Adopted Area-Specific Requirements. Response: There is no known adopted area-specific requirements for this short plat. Special Requirement No. 2: Flood Hazard Area Delineation. Response: The project is not located within a floodplain or floodway. Special Requirement No. 3: Flood Protection Facilities. Response: No flood protection facilities are proposed or will be modified. Special Requirement No. 4: Source Control. Response: There are no known source controls required with this development. Special Requirement No. 5: Oil Control. Response: This project is not considered a high-use site; therefore, special oil controls are not required for this development. Tab 3.0 17884.001 3.0 OFF-SITE ANALYSIS Please refer to the enclosed Level 1 Downstream Drainage Analysis that is included within the Storm Drainage Report prepared by Cramer Northwest Inc. dated December 3, 2003. C r a m e r N o r t h w e s t I n c . S u r v e y o r s P l a n n e r s E n g i n e e r s S T O R M D R A I N A G E R E P O R T A V . I f • . f l ’ , I 3 L L • • • ‘ ‘ — ‘ ‘ . ‘ - - ‘ . \ L , F O R J I M D A L P A Y 4 0 3 3 N E S U N S E T B L V D , S T E 3 R E N T O N , W A 9 8 0 5 9 D e c e m b e r 3 , 2 0 0 3 e c f l 5 t c l . i C N . I . J O B N O . 2 0 0 3 - 1 6 1 P r e p a r e d b y L a r r y S . K r u e g e r , R E . P h o n e : 2 5 3 . 8 5 2 . 4 8 8 0 T o l l f r e e : 8 0 0 . 2 5 1 , 0 1 8 9 V i s i t C r a m e r N o r t h w e s t o n t h e w e b a t h t t p : t / w w v . c r a m e m w . c o m . I 9 O F D A L P A Y S H O R T P L A T N E 1 9 T H S T R E E T R E N T O N , W A 9 4 % N . C e n t r a l A v e S u i t e i 0 4 K e n t , W A 9 8 0 3 2 F a x : 2 5 3 . 8 5 2 . 4 9 5 5 T A B L E O F C O N T E N T S I . P R O J E C T O V E R V I E W I I . C O N D I T I O N S A N D R E Q U I R E M E N T S S U M M A R Y I I I . O F F S I T E A N A L Y S I S I V . R E T E N T I O N I D E T E N T I O N A N A L Y S I S A N D D E S I G N V . C O N V E Y A N C E S Y S T E M A N A L Y S I S A N D D E S I G N V I . S P E C I A L R E P O R T S A N D S T U D I E S V I I . B A S I N A N D C O M M U N I T Y P L A N S V I I I . O T H E R P E R M I T S I X . E R O S I O N / S E D I M E N T A T I O N C O N T R O L D E S I G N X . B O N D Q U A N T I T I E S , F A C I L I T Y S U M M A R I E S A N D D E C L A R A T I O N O F C O V E N A N T X I . O P E R A T I O N S A N D M A I N T E N A N C E M A N U A L A P P E N D I X A O F F S I T E A N A L Y S I S R E P O R T A P P E N D I X B C O N V E Y A N C E S Y S T E M C A L C U L A T I O N S I . P R O J E C T O V E R V I E W E x i s t i n g C o n d i t i o n s : T h i s p r o j e c t i s s o u t h e a s t o f t h e i n t e r s e c t i o n o f N E g t h S t r e e t a n d R e d m o n d A v e N E . I t l i e s a l o n g t h e s o u t h s i d e o f N E 1 9 t h S t r e e t . T h e p a r c e l # i s 0 4 2 3 0 5 - 9 0 3 2 . T h e s i t e i s a p p r o x i m a t e l y 2 . 5 a c r e s . T h e n o r t h e r n p o r t i o n o f t h e s i t e c o n s i s t s o f m o s t l y o f g r a s s a n d s c o t c h b r o o m . T h e r e i s a l a r g e d e t e n t i o n v a u l t l o c a t e d i n t h e n o r t h e a s t p o r t i o n o f t h e p r o j e c t t h a t w a s d e s i g n e d t o d e t a i n t h e s t o r m w a t e r f r o m t h i s s i t e a n d t h e D a l p a y E s t a t e s p r o j e c t n o r t h w e s t o f t h i s p r o j e c t . T h e s o u t h e r n p o r t i o n o f t h e p r o j e c t i s c o m p l e t e l y f o r e s t e d w i t h m o s t l y e v e r g r e e n s a n d h a s a r a v i n e t h a t r u n s t h r o u g h i t . T h e e x i s t i n g d r a i n a g e t e n d s t o s h e e t f l o w t o w a r d s t h e r a v i n e , w h e r e i t b e c o m e s a s m a l l s t r e a m t h a t f l o w s t o w a r d N E S u n s e t B o u l e v a r d . T h e s m a l l s t r e a m t h e n j o i n s a n o t h e r s t r e a m t h a t p a r a l l e l s N E S u n s e t B o u l e v a r d . T h e s i t e ’ s s o i l i s a n A l d e r w o o d G r a v e l l y S a n d y L o a m ( A g C ) a n d i s c o n s i d e r e d a T y p e C s o i l . P r o p o s e d C o n d i t i o n s : T h e p r o j e c t p r o p o s e s t o s u b d i v i d e t h e s i t e i n t o f i v e r e s i d e n t i a l t o t s . A c c e s s t o t h e l o t s w i l l b e p r o v i d e d v i a a p r i v a t e s t r e e t o f f o f N E 1 9 t h S t r e e t a t t h e n o r t h e a s t c o r n e r o f t h e s i t e . R o o f r u n o f f w i l l b e c o n v e y e d t h r o u g h p e r f o r a t e d s t u b o u t s p r i o r t o i t s c o n n e c t i o n t o t h e p r o p o s e d r o a d d r a i n a g e s y s t e m . R o a d r u n o f f f r o m t h e p r i v a t e s t r e e t w i l l b e c o l l e c t e d i n c a t c h b a s i n s a n d c o n v e y e d i n s t o r m p i p e s t o t h e e x i s t i n g d e t e n t i o n v a u l t . A l l d r a i n a g e f a c i l i t i e s h a v e b e e n d e s i g n e d p e r t h e 1 9 9 0 K i n g C o u n t y S u r f a c e W a t e r D e s i g n M a n u a l a s a d o p t e d b y t h e C i t y o f R e n t o n . I I . C O N D I T I O N S A N D R E Q U I R E M E N T S S U M M A R Y P r e l i m i n a r y c o n d i t i o n s h a v e b e e n p r o v i d e d . T h e c o r e r e q u i r e m e n t s o f t h e K i n g C o u n t y S u r f a c e W a t e r D e s i g n M a n u a l ( K C S W D M ) w i l t b e p r o v i d e d a s f o l l o w s : C o r e R e q u i r e m e n t # 1 , D i s c h a r g e a t t h e N a t u r a l L o c a t i o n : T h e n a t u r a l d i s c h a r g e l o c a t i o n f o r t h i s s i t e i s i n t o a r a v i n e l o c a t e d i n t h e m i d d l e o f t h e p r o p e r t y . R u n o f f w i l t b e c o n v e y e d t o a n e x i s t i n g d e t e n t i o n v a u l t l o c a t e d i n t h e n o r t h e a s t p o r t i o n o f t h e p r o p e r t y p r i o r t o b e i n g r e l e a s e d t o t h e r a v i n e . V . C O N V E Y A N C E S Y S T E M A N A L Y S I S A N D D E S I G N C o n v e y a n c e c a l c u l a t i o n s f o r t h e p t o p o s e d t o a d d r a i n a g e s y s t e m a r e p r o v i d e d i n A p p e n d i x B . V I . S P E C I A L R E P O R T S A N D S T U D I E S A G e o t e c h n i c a l R e p o r t p r e p a r e d b y D e n n i s J e w e l h a s b e e n p r e p a r e d f o r t h i s p r o j e c t . A D r a i n a g e R e p o r t w a s p r e p a r e d b y D i c k S t u t h f o r t h e D a l p a y E s t a t e s p r o j e c t t o t h e n o r t h w e s t o f t h i s p r o j e c t . V I I . B A S I N A N D C O M M U N I T Y P L A N S T h i s s i t e i s l o c a t e d i n t h e M a y C r e e k B a s i n P l a n . N o c o m m u n i t y p l a n s a r e k n o w n t o e x i s t . V I I I . O T H E R P E R M I T S N o o t h e r p e r m i t s a r e k n o w n t o b e r e q u i r e d a t t h i s t i m e . I X . E R O S I O N I S E D I M E N T A T I O N C O N T R O L D E S I G N A n e r o s i o n a n d s e d i m e n t a t i o n c o n t r o l p l a n h a s b e e n p r o v i d e d f o r t h i s p r o j e c t . S o m e o f t h e e l e m e n t s t o b e p r o v i d e d a r e a c o n s t r u c t i o n e n t r a n c e , s i l t f e n c e , i n l e t p r o t e c t i o n a n d s e e d i n g . P e r A p p e n d i x D o f t h e K C S W D M , s i l t f e n c e c a n b e t h e p r i m a r y t r e a t m e n t i f t h e f l o w p a t h i s 2 0 0 f e e t w i t h a s l o p e o f 1 6 . 7 % o r l e s s . T h e f l o w p a t h o f t h e c l e a r i n g l i m i t s i s a b o u t 2 0 0 ’ w i t h a n a v e r a g e s l o p e o f 5 % , t h u s s a t i s f y i n g t h e c r i t e r i a . X . B O N D Q U A N T I T I E S , F A C I L I T Y S U M M A R I E S A N D D E C L A R A T I O N O F C O V E N A N T T h i s i n f o r m a t i o n w i l l b e p r o v i d e d p r i o r t o p e r m i t i s s u a n c e i f r e q u e s t e d . X I . M A I N T E N A N C E A N D O P E R A T I O N S M A N U A L A m a i n t e n a n c e a n d o p e r a t i o n s m a n u a l w i l l b e p r o v i d e d p r i o r t o p e r m i t i s s u a n c e i f r e q u e s t e d . C o r e R e q u i r e m e n t # 2 , O f f s i t e A n a l y s i s : A n o f f s i t e a n a l y s i s i s p r o v i d e d i n A p p e n d i x A . C o r e R e q u i r e m e n t # 3 , R u n o f f C o n t r o l : F l o w c o n t r o l i s p r o v i d e d v i a a n e x i s t i n g d e t e n t i o n v a u l t l o c a t e d i n t h e n o r t h e a s t p o r t i o n o f t h e p r o p e r t y . A f l o w c o n t r o l s t r u c t u r e r e l e a s e s t h e r u n o f f a t t h e a p p r o p r i a t e r a t e s t o t h e r a v i n e m e n t i o n e d b e f o r e . T h e d e t e n t i o n v a u l t a n d f l o w c o n t r o l s t r u c t u r e w a s d e s i g n e d a s p a r t o f t h e D a l p a y E s t a t e s p r o j e c t l o c a t e d n o r t h w e s t o f t h i s p r o j e c t . T h e v a u l t a n d c o n t r o l s t r u c t u r e w a s d e s i g n e d t o a c c o m m o d a t e t h i s p r o j e c t a l s o . C o r e R e q u i r e m e n t # 4 , C o n v e y a n c e S y s t e m : T h e c o n v e y a n c e s y s t e m w i l l c o n s i s t o f c a t c h b a s i n s a n d s t o r m p i p e s . R o o f r u n o f f w i l t b e c o n v e y e d t h r o u g h p e r f o r a t e d s t u b o u t s p r i o r t o b e i n g c o n n e c t e d t o t h e r o a d d r a i n a g e s y s t e m . T h e s t o r m s y s t e m w i l l c o n v e y t h e r u n o f f t o t h e u p s t r e a m e n d o f t h e e x i s t i n g d e t e n t i o n v a u l t . C o n v e y a n c e c a l c u l a t i o n s f o r t h e p r o p o s e d r o a d d r a i n a g e s y s t e m a r e p r o v i d e d i n A p p e n d i x B . C o r e R e q u i r e m e n t # 5 , E r o s i o n l S e d i m e n t a t i o n C o n t r o l : A n e r o s i o n a n d s e d i m e n t a t i o n c o n t r o l p l a n h a s b e e n d e s i g n e d f o r t h i s p r o j e c t . S o m e o f t h e e l e m e n t s t o b e p r o v i d e d a r e a c o n s t r u c t i o n e n t r a n c e , s i l t f e n c e , i n l e t p r o t e c t i o n a n d s e e d i n g . C o r e R e q u i r e m e n t # 6 , M a i n t e n a n c e a n d O p e r a t i o n s : A m a i n t e n a n c e a n d o p e r a t i o n s m a n u a l w i l l b e p r o v i d e d p r i o r t o p e r m i t i s s u a n c e . C o r e R e q u i r e m e n t # 7 , F i n a n c i a l G u a r a n t e e s a n d L i a b i l i t y : T h e o w n e r w i l l p r o v i d e t h i s i n f o r m a t i o n p r i o r t o p e r m i t i s s u a n c e . I l l . O F F S I T E A N A L Y S I S A L e v e l I O f f s i t e D r a i n a g e A n a l y s i s h a s b e e n p r o v i d e d i n A p p e n d i x A . I V . R E T E N T I O N I D E T E N T I O N A N A L Y S I S A N D D E S I G N N o n e w r e t e n t i o n / d e t e n t i o n s y s t e m i s p r o p o s e d . T h e e x i s t i n g d e t e n t i o n v a u l t a n d c o n t r o l s t r u c t u r e w a s d e s i g n e d t o a c c o m m o d a t e t h i s p r o j e c t s r u n o f f . P l e a s e s e e t h e s t o r m c a l c u l a t i o n s f o r t h e D a l p a y E s t a t e s p r o j e c t l o c a t e d n o r t h w e s t o f t h i s p r o j e c t . A P P E N D I X A O F F S I T E A N A L Y S I S R E P O R T L E V E L I D R A I N A G E A N A L Y S I S O F D A L P A Y S H O R T P L A T N E 1 9 T H S T R E E T R E N T O N , W A S H I N G T O N F O R J I M D A L P A Y 4 0 3 3 N E S U N S E T B L V D , S T E 3 R E N T O N , W A S H I N G T O N 9 8 0 5 9 D e c e m b e r 3 , 2 0 0 3 C . N . I . J O B N O . 2 0 0 3 - 1 6 1 P r e p a r e d b y L a r r y S . K r u e g e r , P . E . T A B L E O F C O N T E N T S I . T A S K I S T U D Y A R E A D E F I N I T I O N A N D M A P S I I . T A S K 2 R E S O U R C E R E V I E W I I I . T A S K 3 F I E L D I N S P E C T I O N I V . T A S K 4 D R A I N A G E S Y S T E M D E S C R I P T I O N A N D P R O B L E M D E S C R I P T I O N S V . T A S K 5 M I T I G A T I O N O F E X I S T I N G O R P O T E N T I A L P R O B L E M S T A S K I S T U D Y A R E A D E F I N I T I O N A N D M A P S T A S K I S T U D Y A R E A D E F I N I T I O N T h i s p r o j e c t i s s o u t h e a s t o f t h e i n t e r s e c t i o n o f N E 1 9 t h S t r e e t a n d R e d m o n d A v e N E . I t l i e s a l o n g t h e s o u t h s i d e o f N E 1 9 t h S t r e e t . T h e p a r c e l # i s 0 4 2 3 0 5 - 9 0 3 2 . T h e s i t e i s a p p r o x i m a t e l y 2 . 5 a c r e s . T h e n o r t h e r n p o r t i o n o f t h e s i t e c o n s i s t s o f m o s t l y o f g r a s s a n d s c o t c h b r o o m . T h e r e i s a l a r g e d e t e n t i o n v a u l t l o c a t e d i n t h e n o r t h e a s t p o r t i o n o f t h e p r o j e c t t h a t w a s d e s i g n e d t o d e t a i n t h e s t o r m w a t e r f r o m t h i s s i t e a n d t h e D a l p a y E s t a t e s p r o j e c t n o r t h w e s t o f t h i s p r o j e c t . T h e s o u t h e r n p o r t i o n o f t h e p r o j e c t i s c o m p l e t e l y f o r e s t e d w i t h m o s t l y e v e r g r e e n s a n d h a s a r a v i n e t h a t r u n s t h r o u g h i t . T h e e x i s t i n g d r a i n a g e t e n d s t o s h e e f f l o w t o w a r d s t h e r a v i n e , w h e r e i t b e c o m e s a s m a l l s t r e a m t h a t f l o w s t o w a r d N E S u n s e t B o u l e v a r d . T h e s m a l l s t r e a m t h e n j o i n s a n o t h e r s t r e a m t h a t p a r a l l e l s N E S u n s e t B o u l e v a r d . T h e s i t e ’ s s o i l i s a n A l d e r w o o d G r a v e l l y S a n d y L o a m ( A g C ) a n d i s c o n s i d e r e d a T y p e C s o i l . M A P S A v i c i n i t y m a p , s e n s i t i v e a r e a s m a p , a e r i a l , a n d o f f s i t e d r a i n a g e m a p c a n b e f o u n d i n t h e p r o c e e d i n g p a g e s . j o c Q 3 f r 7 F 7 T & W N’ ) A ‘ . t t 1 S S U U I J t I — — — — r r o ” ‘ i I 9 £ • O , C 1 r - ° f _ _ _ _ _ • . _ _ . 5 * S ± J G 1 g H i l l 3 N 1c1 9! _ _ _ _ _ _ _ _ 6 I I L _ _ _ _ _ oz ’ o ; [ I LI . - H - - w _ tI L t — t I V 3 I j L E L 1 d !j S 0 — LS H1 6 1 3 N _ _ _ _ _ _ 1 + 11 Th • 1 r n 6 c I — ‘ m c — - L . I , ; - ; - ; ; ‘ L J U l / 4 I r I ,v s t 0’ ! 9 ‘ I I ‘- . 1 . a o J I I 9i L h j ° ‘ V V • j I I 9 d S IN I I i J ‘V P6 0 t — n I \ _ _ _ _ — 1 1 1 i 3 i i F z c o 8 I d S I I I 6 Z j 9 — N U) c9 - 3 N L l L O l Z ZO L I O L I LO L 9S ? L OL ZL O L 6L O L I ä Of . 8/ L C e X Z 1 0 6 0 9 \ , z ” 1 s o V e o 9 l o g S I 7 9 6 6 0 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3 6 4 3 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ $ T \ _ _ 2 I S T S T U , — . 7 ‘ ‘ ‘ ‘ 7 5 . 8 / ? _ _ _ _ _ _ 7 2 Z 5 \ ‘ I S E 8 5 . 5 _ 1 L I / 2 / C . . 2 4 4 2 / / _ _ _ _ _ _ 2 5 5 I ’ S / 4 . 9 0 8 5 5 _ _ < 2 6 N E Y C R E E K I H 8 5 . 5 W I O f 8 - 0 0 / / 4 0 - _ _ _ _ _ _ _ ‘ 3 1 7 . 3 — k . L b / 4 2 8 3 ] _ _ _ _ _ _ _ _ _ 1 0 _ _ _ _ _ _ 1 k 8 5 , 5 r i \ \ 2 8 0 5 1 c I _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ E 1 0 5 T h L r 3 1 0 4 6 - \ _ _ _ _ _ _ / 3 5 / O \ 8 4 . 7 6 I / 2 2 . 2 6 - 0 0 0 A 1 4 L i P L 1 € ‘ ‘ k ‘ 7 3 ’ c p 3 f r / — . G R E E N W A Y g _ _ _ _ _ _ _ _ _ ¶ . \ & s I A c u I N 2 2 0 2 6 T t 3 4 k I ) / 5 8 A c 4 2 ‘ _ _ _ _ _ s \ I 2 7 6 V ‘ I 3 C O 2 7 8 . 9 7 1 0 — 6 8 . 8 2 I 5 5 I 9 4 , J I 2 7 8 7 3 0 9 7 A ’ I 2 2 6 o L = 2 7 8 $ ? p / 9 0 0 2 0 % T H 4 5 . 2 4 5 5 5 3 2 6 3 - S E / 0 6 / 3 I , I , I , I ) ‘ I N 7 3 , 0 A c _ _ _ _ _ _ _ _ _ \ t T L 2 6 0 3 0 3 I 6 A c 9 4 3 2 7 0 4 7 1 4 5 5 4 6 7 I 4 2 8 d 0 9 5 A L u N . E . 8 P a r k _ _ _ _ _ _ ‘ 9 5 ; , 5 0 f ? . ? N 1 1 7 1 7 k L a J _ J 4 I u _ _ _ _ _ _ 9 ! 0 Z ‘ I — < t 1 S ‘ 4 I 3 - - p 3 6 _ \ 0 8 4 _ _ _ _ g — . - s t — N E 1 7 T H S T _ _ _ _ _ _ _ _ _ _ _ _ _ - 7 ) 7 7 I 8 5 6 0 4 7 3 . ‘ 7 Z 2 8 0 _ _ _ _ _ _ _ _ _ _ _ _ _ _ 0 4 8 4 A c / 0 3 / / 0 9 1 0 3 3 2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ o i S o / 7 0 S C / 8 3 6 7 _ _ _ _ _ _ 3 2 7 / 9 T I 3 6 3 2 * 1 8 3 6 5 8 6 s b a 0 8 5 4 8 4 6 2 ‘ L u r t / 7 3 T I 5 7 T I 4 ! T I / 8 3 T I 4 0 f r - ’ I t J i i 0 — 5 3 J 1 O 4 , U 5 4 , 1 1 5 5 . 0 5 1 6 4 I — 3 - _ _ , J 5 5 Q 7 T L 2 7 5 T I 1 9 ’ — ’ 7 / 0 3 S U N S E T J I 1 0 4 . . ‘ 1 7 ç % 1 0 6 ‘ k I ’ 1 2 l I I 2 0 7 \ _ L u T L T o i - - . ‘ 7 < j i _ _ I F 1 / 1 T I 0 _ _ _ t % : J I \ i z 9 i ‘ 0 3 6 A c T I 2 o i A Q y 8 0 2 A c T 1 N 3 5 2 7 7 2 7 1 4 2 ‘ 4 ’ / 5 , 7 . 9 , Z I _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ \ 0 r 3 0 0 c i 0 = 0 I i ! . - o _ . ‘ - . p a 0 0 c i 5 0 0 S S ( 4 [ _ _ / 4 , V i S a N o 0 U D A L P A Y S E N S I T I V E A R E A S _ _ _ _ _ _ _ _ 1 C 1 4 3 J f l ! M 2 f r : 7 1 9 2 Y X 1 O ’ 1 - C M - y w 4 1 r 4 - - “ < t i L 3 5 s t z i t t i - U C _ ’ i 1 k W a 3 ’ 1 - - . i M l 2 j j c G r t A A a z ! 4 * I f t e i J i _ - - Q r n a n s 4 J { € 8 7 6 4 d i f l - ‘ 4 ’ — — 1 ’ : a e 7 6 4 q I è 9 4 0 G * J 1 r c d & - G 4 A Y J : t : . h s 4 r : : : J a ! : : - 1 2 - l I , , , c 3 n L - . C 4 1 3 3 5 9 c 4 9 , _ , - - - - - ( 1 4 f l L % - k 4 t J d L Z 4 1 5 ° t C I L ’ 4 i - . ‘ ( 4 f - e > b l 9 5 e Y 8 5 c v l 2 3 D 0 3 S i J C C O 1 & t j a f t C . t a f l 1 4 ? t ? W o 8 & ) 3 4 l 4 8 O t G S & C j ‘ 5 ” _ _ N E l f l . H J T _ _ _ 4 2 i a i m 4 k - • t • • a ; M a 1 f r < Y d 1 3 4 4 9 5 t 0 1 d 0 - . C T 6 1 1 ’ 3 Q , 1 i - ) a s a ’ d o s a 9 8 3 8 9 c c x 1 8 * 2 7 8 f l ( f l 2 2 0 c - l 2 3 O Y i C : 8 1 1 0 0 5 t 3 0 - c l 2 Y S k k I C t l 5 8 9 J o o 3 2 Y Y 3 g l “ 3 t ( 4 4 3 . k 1 3 C V . . - 1 t S t t r t 1 _ d c v . . _ V j k 4 l f 5 0 — — — — - - — 2 5 W & 1 X X 0 ç t % 3 2 i 3 & 7 2 - - N E J S T H S T 1 4 3 . t S 4 t J Y J * 3 0 ! 4 3 5 , a - - - — I - - V 4 2 3 O 5 9 E 2 + c 3 t b i 1 S ’ ° “ t e x r e o - . - - V C i n - 4 1 1 c 1 n 1 4 L 3 J S J 1 0 5 ‘ - k ) 2 ° 1 l z k L 4 - c t ø a a a 4 o j C ) 3 K i n C . u n t y L ’ 4 2 X 5 S X ) - l - - - - 4 ‘ I D . 1 O 1 m i a 3 z m 2 j L e g e n d , , 4 t S e l e c t e d F e a t u r e s - - . - J r c ; t - o i S Ã O E t o s b n A S t r e e t s L a k e s a n d L a r g e R & e r s - - 1 0 0 Y e a r F b o d p l a i n S Ã O S t r e a m S Ã O W e t i s r i d C a I [ : - S Ã O L a n d s l i d e C u s 2 ° c c n n S Ã O C o a l M i n e S Ã O / V C - o ) 4 T A S K 2 R E S O U R C E R E V I E W T A S K 2 R E S O U R C E R E V I E W A d o p t e d B a s i n P l a n s a n d F i n a l i z e d D r a i n a g e S t u d i e s : T h e s i t e i s l o c a t e d i n t h e M a y C r e e k B a s i n P l a n . B a s i n R e c o n n a i s s a n c e S u m m a r y R e p o r t s : N o k n o w n r e p o r t s a r e k n o w n t o e x i s t . C r i t i c a l D r a i n a g e A r e a M a p s : T h e s i t e i s n o t k n o w n t o b e l o c a t e d i n a n y c r i t i c a l d r a i n a g e a r e a s . ( F E M A ) M a p s : T h e s i t e i s l o c a t e d o u t s i d e t h e 1 0 0 y e a r f l o o d p l a i n . O t h e r O f f s i t e A n a l y s i s R e p o r t s : A D r a i n a g e R e p o r t w a s p r e p a r e d b y D i c k S t u t h f o r t h e D a l p a y E s t a t e s p r o j e c t l o c a t e d n o r t h w e s t o f t h i s p r o j e c t . S e n s i t i v e A r e a s F o l i o : N o n e o f t h e s i t e i s l o c a t e d i n o r n e a r a n y s e n s i t i v e a r e a ( s e e s e n s i t i v e a r e a s m a p u n d e r T a s k 1 ) . D N R D r a i n a g e P r o b l e m s M a p s : N o t a p p l i c a b l e . R o a d D r a i n a g e P r o b l e m s : N o t a p p l i c a b l e . K i n g C o u n t y S o i l s S u r v e y : T h e s i t e ’ s s o i l i s m o s t l y A l d e r w o o d G r a v e l l y S a n d y L o a m , 6 t o 1 5 p e r c e n t s l o p e s ( A g C ) . T h e e x t r e m e s o u t h e r n p o r t i o n o f t h e s i t e c o n t a i n s A l d e r w o o d G r a v e l l y S a n d y L o a m , 1 5 t o 3 0 p e r c e n t s l o p e s ( A g D ) . W e t l a n d s I n v e n t o r y M a p s : T h e r e a r e n o w e t l a n d s l o c a t e d o n o r n e a r t h e s i t e . M i g r a t i n g R i v e r S t u d i e s : N o t a p p l i c a b l e . D r a i n a g e C o m p l a i n t s : A c c o r d i n g t o t h e l i s t o f d r a i n a g e c o m p l a i n t s p r o v i d e d b y K i n g C o u n t y , t h e r e w e r e n o c o m p l a i n t s n e a r t h e d o w n s t r e a m a n a l y s i s t i m i t s o f t h i s p r o j e c t t h a t a r e a r e s u l t o f r u n o f f f r o m t h i s p r o p e r t y . T A S K 3 F I E L D I N S P E C T I O N T A S K 3 F I E L D I N S P E C T I O N A f i e l d i n s p e c t i o n w a s c o n d u c t e d o n D e c e m b e r 3 , 2 0 0 3 t o i n s p e c t t h e o n s i t e d r a i n a g e s y s t e m o f t h e s i t e . O f f s i t e d r a i n a g e s y s t e m s w e r e a l s o i n s p e c t e d d o w n s t r e a m a p p r o x i m a t e l y 1 / 4 m i l e ( s ) f r o m t h e d i s c h a r g e p o i n t o f t h e s i t e . T h e i n s p e c t i o n i n v o l v e d i n v e s t i g a t i o n o f t h e t e n s p e c i f i c i t e m s o f a L e v e l 1 I n s p e c t i o n p e r t h e K i n g C o u n t y S u r f a c e W a t e r D e s i g n M a n u a l , 1 9 9 0 . T h e i n s p e c t i o n y i e l d e d t h e f o l l o w i n g f i n d i n g s : 1 . T h e r e w e r e n o e x i s t i n g o r p o t e n t i a l p r o b l e m s o b s e r v e d . 2 . T h e e x i s t i n g d r a i n a g e s y s t e m c a p a c i t y w a s a d e q u a t e . 3 . T h e r e w e r e n o e x i s t i n g o r p o t e n t i a l f l o o d i n g p r o b l e m s . 4 . T h e r e w e r e n o e x i s t i n g / p o t e n t i a l o v e r t o p p i n g , s e d i m e n t a t i o n , s c o u r i n g o r b a n k s l o u g h i n g p r o b l e m s . 5 . N o s i g n i f i c a n t d e s t r u c t i o n o f a q u a t i c h a b i t a t o r o r g a n i s m s w a s n o t i c e a b l e . 6 . Q u a l i t a t i v e d a t a s u c h a s l a n d u s e , i m p e r v i o u s s u r f a c e s , t o p o g r a p h y , a n d s o i l t y p e s w a s n o t e d a n d c a n b e f o u n d i n T a s k 4 i n f o r m a t i o n . 7 . I n f o r m a t i o n w a s c o l l e c t e d o n p i p e s , d i t c h e s , a n d s t r u c t u r e s . T h i s i n f o r m a t i o n i s a l s o i n c l u d e d i n t h e T a s k 4 i n f o r m a t i o n . 8 . T r i b u t a r y b a s i n s d e l i n e a t e d i n T a s k 1 w e r e v e r i f i e d . 9 . N o n e i g h b o r s w e r e c o n t a c t e d . 1 0 . T h e w e a t h e r c o n d i t i o n s a t t h e t i m e o f t h e i n s p e c t i o n w e r e c o o l a n d c l o u d y . T A S K 4 D R A I N A G E S Y S T E M D E S C R I P T I O N A N D P R O B L E M D E S C R I P T I O N S T A S K 4 D R A I N A G E S Y S T E M D E S C R I P T I O N A N D P R O B L E M D E S C R I P T I O N S S i t e D r a i n a g e T h i s p r o j e c t i s s o u t h e a s t o f t h e i n t e r s e c t i o n o f N E 1 9 t h S t r e e t a n d R e d m o n d A v e N E . I t l i e s a l o n g t h e s o u t h s i d e o f N E 1 9 t h S t r e e t . T h e p a r c e l # i s 0 4 2 3 0 5 - 9 0 3 2 . T h e s i t e i s a p p r o x i m a t e l y 2 . 5 a c r e s . T h e n o r t h e r n p o r t i o n o f t h e s i t e c o n s i s t s o f m o s t l y o f g r a s s a n d s c o t c h b r o o m . T h e r e i s a l a r g e d e t e n t i o n v a u l t l o c a t e d i n t h e n o r t h e a s t p o r t i o n o f t h e p r o j e c t t h a t w a s d e s i g n e d t o d e t a i n t h e s t o r m w a t e r f r o m t h i s s i t e a n d t h e D a l p a y E s t a t e s p r o j e c t n o r t h w e s t o f t h i s p r o j e c t . T h e s o u t h e r n p o r t i o n o f t h e p r o j e c t i s c o m p l e t e l y f o r e s t e d w i t h m o s t l y e v e r g r e e n s a n d h a s a r a v i n e t h a t r u n s t h r o u g h i t . T h e e x i s t i n g d r a i n a g e t e n d s t o s h e e t f i o w t o w a r d s t h e r a v i n e , w h e r e i t b e c o m e s a s m a l l s t r e a m t h a t f l o w s t o w a r d N E S u n s e t B o u l e v a r d . T h e s m a l l s t r e a m t h e n j o i n s a n o t h e r s t r e a m t h a t p a r a l l e l s N E S u n s e t B o u l e v a r d . T h e s i t e ’ s s o i l i s a n A l d e r w o o d G r a v e l l y S a n d y L o a m ( A g C ) a n d i s c o n s i d e r e d a T y p e C s o f l . O f f s i t e D r a i n a g e A n O f f - S i t e A n a l y s i s D r a i n a g e S y s t e m T a b l e i s p r o v i d e d o n t h e n e x t p a g e t h a t d e s c r i b e s i n d e t a i l t h e o f f s i t e d r a i n a g e c o m p o n e n t s a t l e a s t 1 % m i l e d o w n s t r e a m f r o m t h e p r o j e c t d i s c h a r g e l o c a t i o n . P l e a s e r e f e r t o t h e o f f s i t e d r a i n a g e m a p i n T a s k 1 b e c a u s e t h e m a p s y m b o l s l i s t e d i n t h e t a b l e c o r r e s p o n d t o d r a i n a g e c o m p o n e n t s y m b o l s o n t h e o f f s i t e d r a i n a g e m a p s . C , ) C o 0 i C D C D m l — z ø z O G ) O m C D r n - I C D z 1 % ) - I - - l 0 0 0 T A S K 5 M I T I G A T I O N O F E X I S T I N G O R P O T E N T I A L P R O B L E M S T A S K 5 M I T I G A T I O N O F E X I S T I N G O R P O T E N T I A L P R O B L E M S A f t e r a t h o r o u g h f i e l d i n s p e c t i o n a n d a d e t a i l e d r e s o u r c e r e v i e w t h e r e w e r e n o m a j o r o r e x i s t i n g p r o b l e m s i d e n t i f i e d . T h e p r o p o s e d i m p r o v e m e n t s w i l l n o t p r o d u c e a s i g n i f i c a n t i m p a c t t o t h e e x i s t i n g d r a i n a g e p a t t e r n s o n c e t h e s i t e h a s b e e n s t a b i l i z e d a n d t h e r u n o f f h a s b e e n c o n t r o l l e d v i a t h e e x i s t i n g d e t e n t i o n v a u l t a n d c o n t r o l s t r u c t u r e o n s i t e . A t e m p o r a r y e r o s i o n a n d s e d i m e n t a t i o n c o n t r o l p l a n w i l l b e c r e a t e d t o m i n i m i z e t h e t r a n s p o r t o f s e d i m e n t l a d e n r u n o f f t o t h e d o w n s t r e a m c o n v e y a n c e s y s t e m p r i o r t o p e r m i t i s s u a n c e . A P P E N D I X B C O N V E Y A N C E S Y S T E M C A L C U L A T I O N S P r o j e c t S u m m a r y R e p o r t P r o j e c t D e s c r i p t i o n W o r k s h e e t 8 ” D l i 0 . 5 % F l o w E l e m e n t C i r c u l a r C h a n n e l M e t h o d M a n n i n g ’ s F o r m u l a S o l v e F o r D i s c h a r g e I n p u t D a t a M a n n i n g s C o e f f i c i e n t 0 . 0 1 3 S l o p e 0 . 0 0 5 0 0 0 f t / f t D e p t h 0 . 6 7 f t D i a m e t e r 0 . 6 7 f t R e s u l t s D i s c h a r g e 0 . 8 7 c f s F l o w A r e a 0 . 4 f t 2 W e t t e d P e r i m e t e r 2 . 1 0 f t T o p W i d t h 0 . 0 0 f t C r i t i c a l D e p t h 0 . 4 4 f t P e r c e n t F u l l 1 0 0 . 0 % C r i t i c a l S l o p e 0 . 0 0 8 4 6 8 f t / f t V e l o c i t y 2 . 4 6 f t / s V e l o c i t y H e a d 0 . 0 9 f t S p e c i f i c E n e r g y 0 . 7 6 f t F r o u d e N u m b e r 0 . 0 0 M a x i m u m D i s c h a r 0 . 9 3 c f s D i s c h a r g e F u l l 0 . 8 7 c f s S l o p e F u l l 0 . 0 0 5 0 0 0 f t / f t F l o w T y p e N / A P r o j e c t E n g i n e e r : l a r r y k r u e g e r c : h a e s t a d \ f m w ’ 2 0 0 3 - 1 6 7 . f m 2 c r a m e r n o r t h w e s t F l o w M a s t e r v 5 . 0 [ 6 7 4 e j 1 2 / 0 5 / 0 3 0 1 : 0 3 : 2 0 P M © H a e s t a d M e t h o d s , I n c . 3 7 B r o o k s i d e R o a d W a t e r b u r y , C I 0 6 7 0 8 U S A ( 2 0 3 ) 7 5 5 - 7 6 6 6 P a g e 3 o f 3 P r o j e c t S u m m a r y R e p o r t P r o j e c t D e s c r i p t i o n W o r k s h e e t 1 0 ” P V C @ 0 . 3 % F l o w E l e m e n t C i r c u l a r C h a n n e l M e t h o d M a n n i n g ’ s F o r m u l a S o l v e F o r D i s c h a r g e I n p u t D a t a M a n n i n g s C o e f f i c i e n t 0 . 0 1 0 S l o p e 0 . 0 0 3 0 0 0 f t / f t D e p t h 0 . 8 3 f t D i a m e t e r 0 . 8 3 f t R e s u l t s D i s c h a r g e 1 . 5 4 c f s F l o w A r e a 0 . 5 f t 2 W e t t e d P e r i m e t e r 2 . 6 1 f t T o p W i d t h 0 . 0 0 f t C r i t i c a l D e p t h 0 . 5 6 f t P e r c e n t F u l l 1 0 0 . 0 % C r i t i c a l S l o p e 0 . 0 0 4 7 8 6 M t V e l o c i t y 2 . 8 5 f t / s V e l o c i t y H e a d 0 . 1 3 f t S p e c i f i c E n e r g y 0 . 9 6 f t F r o u d e N u m b e r 0 . 0 0 M a x i m u m D i s c h a r 1 . 6 6 c f s D i s c h a r g e F u l l 1 . 5 4 c f s S l o p e F u l l 0 . 0 0 3 0 0 0 f t / f t F l o w T y p e N / A P r o j e c t E n g i n e e r : l a r r y k r u e g e r c : \ h a e s t a d \ f m w ’ 2 0 0 3 - 1 6 1 . f m 2 c r a m e r n o r t h w e s t F l o w M a s t e r v 6 . 0 [ 6 1 4 e } 1 2 / 0 5 / 0 3 0 1 : 0 3 : 2 0 P M © H a e s t a d M e t h o d s , I n c . 3 7 B r o o k s i d e R o a d W a t e r b u r y , C T 0 6 7 0 8 U S A ( 2 0 3 ) 7 5 5 - 1 6 6 6 P a g e 2 o f 3 P r o j e c t D e s c r i p t i o n P r o j e c t S u m m a r y R e p o r t W o r k s h e e t 1 0 ” D I @ 0 . 3 % F l o w E l e m e n t C i r c u l a r C h a n n e l M e t h o d M a n n i n g ’ s F o r m u l a S o l v e F o r D i s c h a r g e I n p u t D a t a M a n n i n g s C o e f f i c i e n t 0 . 0 7 3 S l o p e 0 . 0 0 3 0 0 0 f t / f t D e p t h 0 . 8 3 f t D i a m e t e r 0 . 8 3 f t R e s u l t s D i s c h a r g e 1 . 1 9 c f s F l o w A r e a 0 . 5 f t 2 W e t t e d P e r i m e t e r 2 . 6 1 f t T o p W i d t h 0 . 0 0 f t C r i t i c a l D e p t h 0 . 4 9 f t P e r c e n t F u l l 1 0 0 . 0 % C r i t i c a l S l o p e 0 . 0 0 7 1 3 9 f t / f t V e l o c i t y 2 . 1 9 f t / s V e l o c i t y H e a d 0 . 0 7 f t S p e c i f i c E n e r g y 0 . 9 0 f t F r o u d e N u m b e r 0 . 0 0 M a x i m u m D i s c h a r c 1 . 2 8 c f s D i s c h a r g e F u l l 1 . 1 9 c f s S l o p e F u l l 0 . 0 0 3 0 0 0 f t / f t F l o w T y p e N / A P r o j e c t E n g i n e e r : l a r r y k r u e g e r c : ’ h a e s t a d \ f m w \ 2 0 0 3 - 1 6 1 . f m 2 c r a m e r n o r t h w e s t F l o w M a t e r v 6 . 0 [ 6 1 4 e 1 1 2 / 0 5 / 0 3 0 1 : 0 3 : 2 0 P M © H a e s t a d M e t h o d s , I n c . 3 7 B r o o k s i d e R o a d W a t e r b u r y , C T 0 6 7 0 8 U S A ( 2 0 3 ) 7 5 5 - 7 6 6 6 P a g e 1 o f 3 f l a n l l h a n - R e d a l p a y s h o r t p l a t F r o m : “ L . K r u e g e r ” < d d u b @ l o c a l a c c e s s . c o m > T o : “ J a n l I l i a n ” < J i l l i a n @ c i . r e n t o n . w a . u s > D a t e : 2 / 6 / 0 4 1 : 4 0 P M S u b j e c t : R e : d a l p a y s h o r t p l a t J a n , I h a v e a t t a c h e d m o r e c a l c u l a t i o n s r e g a r d i n g t h i s p r o j e c t a n d i t s s t o r a g e v o l u m e s . T h i s p r o j e c t , i f i t w a s n ’ t e x e m p t f r o m f l o w c o n t r o l , w o u l d r e q u i r e 1 5 3 6 c f o f a c t i v e v o l u m e s t o r a g e . T h e e x i s t i n g v a u l t p r o v i d e s 2 5 , 1 5 2 c f o f a c t i v e v o l u m e s t o r a g e ( 2 4 ’ x 1 3 1 ’ x 8 ’ ) . I f w e h a d t o p r o v i d e f l o w c o n t r o l , o u r r e q u i r e d s t o r a g e w o u l d o n l y b e 6 % o f t h e e x i s t i n g v a u l t . E - m a i l m e i f y o u n e e d a n y t h i n g e l s e . L a r r y S . K r u e g e r , P . E . C r a m e r N W O r i g i n a l M e s s a g e F r o m : “ J a n l I l i a n ” < J i l l i a n @ c i . r e n t o n . w a . u s > T o : < d d u b @ l o c a l a c c e s s . c o m > S e n t : F r i d a y , F e b r u a r y 0 6 , 2 0 0 4 1 2 : 1 1 P M S u b j e c t : R e : d a l p a y s h o r t p l a t T h a n k s L a r r y S o . . . . B a s e d o n t h e p r o p o s e d p l a n o f a p p r o x i m a t e l y 3 , 2 0 0 s q f e e t o f n e w i n t e r n a l r o a d w a y a n d l e t ’ s s a y a p p r o x i m a t l e y 5 , 0 0 0 s q u a r e f e e t o f r o o f a r e a , h o w m u c h v o l u m e w o u l d b e n e e d e d i n t h e v a u l t t o a c c o m o d a t e t h e s e c o n n e c t i o n s ? > > > “ L . K r u e g e r ” < d d u b @ l o c a l a c c e s s . c o m > 0 2 / 0 6 / 0 4 1 1 : 2 5 A M > > > H i J a n , P e r o u r c o n v e r s a t i o n t h i s m o r n i n g I h a v e c a l c u l a t e d t h e p r e - d e v e l o p e d a n d d e v e l o p e d b a s i n s f o r t h i s p r o j e c t . P e r S e c t i o n 1 . 2 . 3 o f t h e 1 9 9 0 K i n g C o u n t y S u r f a c e W a t e r D e s i g n M a n u a l , t h i s p r o j e c t i s e x e m p t f r o m f l o w c o n t r o l . I t i s e x e m p t b e c a u s e o f t h e n e g l i g i b l e p e a k r u n o f f r a t e i n c r e a s e . T h e 1 0 0 y e a r d e v e l o p e d r u n o f f r a t e i s l e s s t h a n 0 . 5 c f s m o r e t h a n t h e 1 0 0 y e a r p r e - d e v e l o p e d r u n o f f r a t e . T h e d e v e l o p e d r u n o f f r a t e w a s c a l c u l a t e d t o b e 0 . 7 4 c f s , w h i l e t h e p r e - d e v e l o p e d r a t e w a s c a l c u l a t e d t o b e 0 . 4 2 c f s . T h e d i f f e r e n c e i s o n l y 0 . 3 2 c f s , w h i c h i s b e l o w t h e 0 . 5 c f s a l l o w e d . I h a v e a t t a c h e d t h e s t o r m c a l c u l a t i o n s f o r y o u r r e v i e w . H o p e f u l l y t h i s i n f o r m a t i o n , a n d t h e i n f o r m a t i o n t h a t D i c k S t u t h i s g o i n g t o p r o v i d e , w i l l e n a b l e y o u t o c o n t i n u e y o u r r e v i e w a n d n o t p u t t h e p r o j e c t o n h o l d . T h a n k s f o r y o u r c o o p e r a t i o n s o f a r , S t o r m C a l c u l a t i o n s ( b y S t o r m S h e d ) P r o j e c t P r e c i p s [ 2 y r J 2 . 0 0 i n [ 1 0 y r ] 2 . 9 0 i n [ 1 0 0 y r ] 3 . 9 0 i n P r e d e v e l o p e d B a s i n D r a i n a g e A r e a : P R E D E V H y d M e t h o d : S B U H H y d L o s s M e t h o d : S C S C N N u m b e r P e a k F a c t o r : 4 8 4 . 0 0 S C S A b s : 0 . 2 0 S t o r m D u r 2 4 . 0 0 h r s A r e a C N T C P e r v i o u s 0 . 9 8 0 0 a c 8 5 . 0 0 0 . 4 0 h r s I m p e r v i o u s 0 . 0 1 0 0 a c 9 8 . 0 0 0 . 0 0 h r s T o t a l 0 . 9 9 0 0 a c S u p p o r t i n g D a t a : P e r v i o u s C N D a t a : G R A S S , B R U S H 8 5 . 0 0 0 . 9 8 0 0 a c I m p e r v i o u s C N D a t a : E X I S T I N G B U I L D I N G 9 8 . 0 0 0 . 0 1 0 0 a c P e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t G R A S S , B R U S H 2 2 0 . 0 0 f t 1 . 8 0 % 0 . 1 5 0 0 2 3 . 7 1 m m I m p e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t D U M M Y 1 . 0 0 f t 1 0 . 0 0 % 0 . 0 0 1 0 0 . 0 0 m m D e v e l o p e d B a s i n D r a i n a g e A r e a : D E V H y d M e t h o d : S B U H H y d L o s s M e t h o d : S C S C N N u m b e r P e a k F a c t o r : 4 8 4 . 0 0 S C S A b s : 0 . 2 0 S t o r m D u r 2 4 . 0 0 h r s A r e a C N T C P e r v i o u s 0 . 4 9 0 0 a c 8 6 . 0 0 0 . 1 0 h r s I m p e r v i o u s 0 . 5 0 0 0 a c 9 8 . 0 0 0 . 0 5 h r s T o t a l 0 . 9 9 0 0 a c S u p p o r t i n g D a t a : P e r v i o u s C N D a t a : G R A S S , L A W N 8 6 . 0 0 0 . 4 9 0 0 a c I m p e r v i o u s C N D a t a : B L D G S , D W A Y S , P A V I N G , S I D E W A L K S 9 8 . 0 0 0 . 5 0 0 0 a c P e r v i o u s I C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t L A W N S 8 2 . 0 0 f t 7 . 0 0 % 0 . 1 5 0 0 6 . 2 5 m m I m p e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h a l l o w P A V E M E N T 7 0 . 0 0 f t 1 . 0 0 % 2 7 . 0 0 0 0 0 . 4 3 m m C h a n n e l D I P I P E 2 5 7 . 0 0 f t 0 . 3 0 % 3 6 . 0 0 0 0 2 . 1 7 m m C h a n n e l C M P P I P E 3 7 . O O f t 2 . 3 0 % 2 1 . 0 0 0 0 0 . 1 9 m m B a s i n L i s t B a s i n I D P e a k Q P e a k T P e a k V o l A r e a M e t h o d R a i n t y p e E v e n t ( c f s ) ( h r s ) ( a c - f t ) a c I L o s s P R E D E V P R E D E V 0 . 1 1 5 6 8 . 1 7 0 . 0 6 6 4 0 . 9 9 S B U H / S C S T Y P E 1 A 2 y r P R E D E V 0 . 2 5 1 3 8 . 1 7 0 . 1 2 5 1 0 . 9 9 S B U H / S C S T Y P E 1 A l O y r P R E D E V 0 . 4 1 9 7 8 . 1 7 0 . 1 9 6 5 0 . 9 9 S B U H / S C S T Y P E 1 A 1 0 0 y r D E V 0 . 3 0 5 8 7 . 8 3 0 . 1 0 8 6 0 . 9 9 S B U H / S C S T Y P E 1 A 2 y r D E V 0 . 5 0 5 7 7 . 6 3 0 . 1 7 5 6 0 . 9 9 S B U H / S C S T Y P E 1 A l O y r D E V 0 . 7 3 7 6 7 . 8 3 0 . 2 5 3 0 0 . 9 9 S B U H / S C S T Y P E 1 A 1 0 0 y r O u t f l o w H y d r o g r a p h s H y d i D P e a k Q P e a k T P e a k V o l C o n t A r e a ( c f s ) ( h r s ) ( a c - f t ) ( a c ) 2 o u t 0 . 1 1 9 . 0 0 0 . 1 0 8 6 0 . 9 9 0 0 l 0 o u t 0 . 2 5 8 . 3 3 0 . 1 7 5 6 0 . 9 9 0 0 l 0 0 0 u t 0 . 4 2 8 . 3 3 0 . 2 5 3 0 0 . 9 9 0 0 S t o r a g e S t r u c t u r e N o d e I D : v a u l t D e s c : M a n h o l e s t r u c t u r e S t a r t E l : 4 1 0 . 0 0 0 0 f t M a x E l : 4 1 8 . 0 0 0 0 f t C o n t r i b B a s i n : C o n t r i b H y d : L e n g t h W i d t h V o i d R a t i o 8 . 0 0 0 0 f t 2 4 . 0 0 0 0 f t 1 0 0 . 0 0 D i s c h a r g e S t r u c t u r e C o n t r o l S t r u c t u r e I D : o r i f - M u l t i p l e O r i f i c e S t r u c t u r e D e s c r i p : M u l t i p l e O r i f i c e S t a r t E l M a x E l I n c r e m e n t 4 1 0 . 0 0 0 0 f t 4 1 8 . 0 0 0 0 f t 0 . 1 0 O r i f C o e f f : 0 . 6 2 B o t t o m E l : 4 1 0 . 0 0 f t L o w e s t D i a m : 1 . 4 9 4 1 i n o u t t o 2 n d : 3 . 6 0 0 0 f t D i a m : 1 . 6 6 9 9 i n 2 n d t o 3 r d : 2 . 0 4 0 0 f t D i a m : 1 . 4 9 4 1 i n H y d r o g r a p h R o u t i n g R L P C O M P U T E [ I p o o l ] S U M M A R Y 2 y r M a t c h Q : 0 . 1 1 5 6 c f s P e a k O u t Q : 0 . 1 1 4 8 c f s - P e a k S t g : 4 1 3 . 5 9 f t - A c t i v e V o l : 6 8 9 . 7 3 c f 1 0 y r M a t c h Q : 0 . 2 5 1 3 c f s P e a k O u t Q : 0 . 2 5 1 7 c f s - P e a k S t g : 4 1 5 . 6 3 f t - A c t i v e V o l : 1 0 8 1 . 7 8 c f 1 0 0 y r M a t c h Q : 0 . 4 1 9 7 c f s P e a k O u t Q : 0 . 4 2 0 0 c f s - P e a k S t g : 4 1 7 . 9 4 f t - A c t i v e V o l : 1 5 2 3 . 7 0 c f S t o r m C a l c u l a t i o n s ( b y S t o r m S h e d ) P r o j e c t P r e c i p s [ 1 0 0 y r J 3 . 9 0 i n P r e d e v e l o p e d B a s i n D r a i n a g e A r e a : P R E D E V H y d M e t h o d : S B U H H y d L o s s M e t h o d : S C S C N N u m b e r P e a k F a c t o r : 4 8 4 . 0 0 S C S A b s : 0 . 2 0 S t o r m D u r 2 4 . 0 0 h r s A r e a C N T C P e r v i o u s 0 . 9 8 0 0 a c 8 5 . 0 0 0 . 4 0 h r s I m p e r v i o u s 0 . 0 1 0 0 a c 9 8 . 0 0 0 . 0 0 h r s T o t a l 0 . 9 9 0 0 a c S u p p o r t i n g D a t a : P e r v i o u s C N D a t a : G R A S S , B R U S H 8 5 . 0 0 0 . 9 8 0 0 a c I m p e r v i o u s C N D a t a : E X I S T I N G B U I L D I N G 9 8 . 0 0 0 . 0 1 0 0 a c P e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t G R A S S , B R U S H 2 2 0 . 0 0 f t 1 . 8 0 % 0 . 1 5 0 0 2 3 . 7 1 m m I m p e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t D U M M Y 1 . 0 0 f t 1 0 . 0 0 % 0 . 0 0 1 0 0 . 0 0 m m D e v e l o p e d B a s i n D r a i n a g e A r e a : D E V H y d M e t h o d : S B U H H y d L o s s M e t h o d : S C S C N N u m b e r P e a k F a c t o r : 4 8 4 . 0 0 S C S A b s : 0 . 2 0 S t o r m D u r 2 4 . 0 0 h r s A r e a C N T C P e r v i o u s 0 . 4 9 0 0 a c 8 6 . 0 0 0 . 1 0 h r s I m p e r v i o u s 0 . 5 0 0 0 a c 9 8 . 0 0 0 . 0 5 h r s T o t a l 0 . 9 9 0 0 a c S u p p o r t i n g D a t a : P e r v i o u s C N D a t a : G R A S S , L A W N 8 6 . 0 0 0 . 4 9 0 0 a c I m p e r v i o u s C N D a t a : B L D G S , D W A Y S , P A V I N G , S I D E W A L K S 9 8 . 0 0 0 . 5 0 0 0 a c P e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h e e t L A W N S 8 2 . 0 0 f t 7 . 0 0 % 0 . 1 5 0 0 6 . 2 5 m m I m p e r v i o u s T C D a t a : F l o w t y p e : D e s c r i p t i o n : L e n g t h : S l o p e : C o e f f : T r a v e l T i m e S h a l l o w P A V E M E N T 7 0 . 0 0 f t 1 . 0 0 % 2 7 . 0 0 0 0 0 . 4 3 m m C h a n n e l D I P I P E 2 5 7 . 0 0 f t 0 . 3 0 % 3 6 . 0 0 0 0 2 . 1 7 m m C h a n n e l C M P P I P E 3 7 . O O f t 2 . 3 0 % 2 1 . 0 0 0 0 0 . 1 9 m m B a s i n L i s t B a s i n i D P e a k Q P e a k T P e a k V o l A r e a M e t h o d R a i n t y p e E v e n t - — ( c f s ) ( h r s ) ( a c - f t ) a c / L o s s P R E D E V 0 . 4 1 9 7 8 . 1 7 0 . 1 9 6 5 0 . 9 9 S B U H I S C S T Y P E I A 1 0 0 y r D E V 0 . 7 3 7 6 7 . 8 3 0 . 2 5 3 0 0 . 9 9 S B U H / S C S T Y P E I A 1 0 0 y r 1 8 / 8 6 / 2 8 8 4 1 8 : 5 1 M e c h 3 n i c a l & C i v i l E n g i n e e r i n g J 3 2 3 2 - 1 3 6 t h A v e . S E . e n t o n , W A 9 8 0 5 9 4 2 5 2 2 8 - 4 2 4 4 F A X t 4 2 S ) 2 2 8 - 4 2 9 2 2 5 3 8 5 2 4 9 5 5 C R A M E R N W P A G E 8 2 S e p t e m b e r 1 4 , 2 0 0 0 R o b e r t L . T u r n e r P r o j e c t M a n a g e r C o n c r e t e T e c h n o l o g y C o r p . 1 1 2 3 P o r t o f T a c o m a , W A 9 8 4 2 1 R E : D a l p a y E s t a t e s V a u l t D e a r R o b e r t , I h a v e r e c e i v e d y o u r d r a w i n g s a n d d e s i g n c a l c u l a t i o n s f o r t h e D a l p a y S t o r m D e t e n t i o n v a u l t a n d t h e y l o o k f i n e . Y o u h a v e d e s i g n e d f o r a l i v e l o a d o f H S 2 O - 4 4 a n d d e a d l o a n s t h a t i n c l u d e 3 6 i n c h e s o f b a c k f i l l a n d a 3 i n c h t h i c k t o p p i n g c o a r s e . P l e a s e l e t t h i s l e t t e r s e r v e a s m y a p p r o v a l o f y o u r p r o p o s e d r o o f s y s t e m . S i S E P 1 5 I C O N t ? E T c o R e W a s h i n g t o n S t a t e r e g e r e d m e c h a n i c a l a r i d c i v i l e n g i n e e r i n g c o r p o r a t I o n 1 / 6 / 2 4 1 : 5 1 2 5 3 8 5 2 4 9 5 5 C R A M E R N W P S E D E S I G N C A L C U L A T I O N S F O R 1 2 V 2 1 ’ T O P P E D H O L L O W C O R E S L A B S S U M f l T A L p v : , ‘ . J F O R ‘ . ‘ “ . B E R S C N L . . 1 A R E t ) . _ _ _ _ _ _ _ _ _ _ D A L P A Y E S T A T E S D E T E N T I O N V A U L T R E N T O N W A S B f l ’ G T O N B Y : C O N C R E T E T E C H N O L O G Y C O R P O R A T I O N J M v I B S C D R C O R A N , P . E . J O B # : 0 0 0 9 9 A - H D A T E . 2 - A u g - O O b Z , o o I H E R E B Y C E R T I F Y T H A T T H E P R E C A S T C O N C R E T E C O M P O N 2 N T $ D E S C R I B E D H E R E I N H A V E B E E N D E S I G N E D T O C A R R Y T E E t . O A D S S P E C I F I E D B Y T h E E N G i N E E R O P R E C O R D , T H E S E C A L C U l A T I O N S A R E H E R E B Y S U B M I n E D T O T H E E N G I N E E R O F R E C O R D F O R R E V T E W A N D A P P R O V A L L E x P t R s . I c ’ Z I 1 / 6 / 2 4 1 : 5 1 2 5 3 8 5 2 4 5 5 C R A M E R N W E m C O N C R E T E T E C H N O L O G Y C O R P O R A T I O N T O P P D 1 2 W ’ H O L L O W C O R E S L A B D E 5 I G N C A L C U L A T I O N S S H E E T o f 4 J O B N A M E : D A L P A Y E S T A T E S D E T E N T I O N V A U L T B Y : J E C J O B N O . : 0 0 0 9 9 A - H D A T E : 2 1 - A u g - C O L O . 4 O . c . . Q ( c , ) 2 7 0 k & P R E S T R E S S I N G S T R A N D S ( M I N I M U M ) 4 ’ — D N O M I N A L D E S I G N C O N F I G U R A T I O N H O L L O W C O R E i t 1 8 / 8 6 / 2 8 8 4 1 8 : 5 1 2 5 3 8 5 2 4 9 5 5 C R M E R N L A J S E C T I O N P R O P E R T I E S : B a t e U l t r a s p a n D e p t h = 1 2 . 5 0 i n E x t e r i o r W e b s : = 1 2 4 . 0 0 k s i f , , = 1 0 0 . 0 0 k s i C o m p o s i t e w / T o p p i n g 3 , 0 0 i n 1 2 0 . 5 8 9 I , = 9 9 7 2 i n 4 Z r , , , = 2 2 8 4 i n 3 Z b = 1 2 3 4 Y = 7 . 4 2 i n 1 b = 8 . 0 8 i n W ( & = 3 8 p s I = 2 8 . 2 6 i n = 4 4 2 i n Z ( = 2 2 5 7 i n 3 A 4 = 2 7 2 i n 2 a ) L i v e L o a d s b ) S u p e r i m p o s e d D e a d L o a d s C ) D e a d L o a d ( P R E C A S T ) U ) D e a d L o a d ( T O P P I N G ) = H S 2 O - 4 4 1 2 0 p c I s o i l = 8 4 p s f = 3 8 p s f ( m a x i m u m d e p t h 3 6 ” ) ( m i n i m u m d e p t h = 0 ” ) R E F E R E N C E S : B u i l d i n g C o d e R e q u i r e m e n t s f o r S t r u c t u r a l C o n c r e t e : A C I 3 1 8 - 9 9 A n a l y s i s o f W h e e l L o a d s o n H o l l o w c o r e P l a n k s w I S o i l C o v e r 1 9 8 8 A S S U M P T I O N S : a ) S t r u c t u r e i s s . m p t e s p a n f o r a l l l o a d s . b ) M a x i m u m a l l o w a b l e t e n s i o n s t r e s s C ) M a x i m u m a l l o w a b l e c o m p r e s s i v e s t r e s s O . 4 5 f . . ) . S a t e c t i o n ç r r i e s s . e f w e i g h t a n d t o p p i n g d e a d l o a d s . w h i l e c o m p o s i t e s e c t i o n c a r r i e s a l l r e m a i n i n g l o a d s . [ C O N C R E T E T E C H N O L O G Y C O R P O R A T I O N [ ç P P E D 1 2 W ’ H O L L O W C O R E S L A B D E S I G N C A L C U L A T I O N S f S H E E T o f 4 P E 8 5 J O B N A M E : D A L P A Y E S T A T E S D E T E N T I O N V A U L T J O B N O . : 0 0 0 9 9 A - H B Y : ] E C D A T E : 2 1 - A u g - C O M A T E R I A L P R O P E R T I E S : C O N C R E T E : 8 0 0 0 p s i w = 1 5 4 p c f = 5 6 4 1 k s i S T R A N D : ‘ , 4 ” D i a m e t e r , 7 w i r e , 2 7 0 k s i , I n t e r i o r W e b s : = 1 8 9 , 0 0 k s i f = 1 5 4 . 0 0 k s i T o p p i n g f = w c = L o w R e l a x a t i o n 3 0 0 0 p s i 1 5 0 p c f 3 3 2 1 k s i A 1 = z t = z b = y t = Y b = = e = 1 4 4 = 3 1 3 i n 2 6 1 3 6 i n 4 1 0 1 9 i n 3 9 4 7 i n 3 6 . 0 2 i n 6 . 4 8 i n 1 0 . 0 0 i n 4 8 . 0 0 i n 4 . 5 6 i n 1 3 . 6 0 i n 1 8 7 i n 2 L O A D S : 1 a / a / 2 4 I : 5 1 2 5 3 8 5 2 4 9 5 5 C R A M E R N W f J D A L P A ’ r £ S T A T E S D E T E N T I 0 V A U L T D e s i g n C s . l c u l a t i o n s f o r 1 2 . 5 i n U L T R A 5 A N 1 2 . 5 i n t J L T R A S A N . f ’ c = 8 0 0 0 p S i : 3 i n c h c o n p o s i c e T o p p i n g , 1 0 - . 5 i n c h 2 7 0 k S t r a n d s , E e 1 5 4 , ‘ ( 5 = 1 . 9 0 A = 3 1 3 , 1 — 6 1 3 6 , Y b = 6 . 4 8 b = 9 4 7 , b w — 1 O . 0 , A e = 2 7 2 , I c L e n g t h = 2 4 . 3 4 f t : L o a d i n g a W g = 0 . 4 8 6 k / f t . 0 i n c h e s S c i 1 2 , R e v i w o f W 1 . e n i r e f c = 3 0 0 0 p s i 9 9 7 3 , Z l i c = 1 2 3 3 1 2 0 p c f + 1 4 5 2 0 - 4 4 2 R v i & w o f X r w m e n t s ( k i p - i n ) p p 1 . $ t r s s r e 9 t r e S 1 e t S t r e s s S t r e n g t h ( f t ) M d M s d M l T o p 8 o t t T o p B o L t T o p B o L t M u 0 . 0 0 0 0 0 . 0 0 0 0 . 0 0 0 - 0 . 0 0 2 0 . 0 1 2 - 0 . 0 0 2 0 . 0 1 2 0 1 8 0 . 5 3 5 0 1 5 7 0 . 1 0 3 - 0 . 1 6 4 - 0 . 0 7 0 0 . . i . 3 3 0 . 0 3 3 0 . 2 6 9 3 1 6 6 5 0 1 . 0 6 8 0 3 0 4 0 . 2 0 0 — 0 . 3 1 8 - 0 . 1 3 3 0 . 8 5 5 0 . 0 6 1 0 . 5 3 7 6 3 . 1 1 2 6 2 1 . 5 1 0 0 0 4 2 9 0 . 2 8 6 - 0 . 4 5 3 - 0 . 2 0 7 1 . 2 7 7 0 . 0 7 9 0 . 8 2 3 8 7 0 1 8 5 3 2 . 0 1 3 0 0 5 3 7 0 . 3 6 1 - 0 . 5 7 1 - 0 . 2 7 5 1 . 6 9 9 0 . 0 8 8 1 . 1 2 6 1 0 9 5 2 4 2 4 2 . 5 1 5 9 0 6 3 5 0 . 4 3 4 - 0 . 6 8 3 - 0 . 2 8 % 1 . 7 5 7 0 . 1 5 0 1 . 0 7 5 1 3 0 2 2 6 6 9 3 . 0 1 8 7 0 7 3 . 0 0 . 4 9 4 - 0 . 7 7 2 - 0 . 2 8 4 1 . 7 5 7 0 . 2 1 0 0 . 9 8 5 1 4 6 8 2 8 6 1 3 . 5 2 1 3 0 7 8 0 0 . 5 5 0 - 0 . 3 5 7 - 0 . 2 8 4 1 . 7 5 7 0 . 2 6 6 0 . 9 0 0 1 6 2 4 3 0 5 0 4 . 0 2 3 7 0 8 3 3 . 0 , 5 9 7 - 0 . 9 2 4 - 0 . 2 6 4 1 . 7 5 7 0 . 3 1 2 0 . 8 3 3 1 7 4 5 3 2 3 7 4 . 5 2 6 0 0 8 7 0 0 . 6 3 7 - 0 . 9 3 0 - 0 . 2 8 4 1 . 7 5 7 0 . 3 5 2 0 . 7 7 7 1 8 4 4 3 4 2 2 5 . 0 2 8 2 0 9 0 0 0 . 6 7 1 - 1 . 0 2 7 - 0 . 2 8 4 1 , 7 5 7 0 . 3 8 ? 0 . 7 1 0 1 9 2 5 3 6 0 3 5 . 5 3 0 2 0 9 1 9 0 . 6 9 9 . 1 . 0 6 4 - 0 . 2 8 4 1 . 7 5 7 0 . 4 1 5 0 . 6 9 3 1 9 8 6 3 7 8 3 6 . 0 3 2 1 0 9 3 3 0 . 7 2 3 - 1 . 0 9 5 - 0 . 2 8 4 1 . 7 5 7 0 . 4 3 9 0 . 6 6 2 2 0 3 5 3 9 6 0 6 . 5 3 3 8 0 9 4 7 0 . 7 4 6 - 1 . 1 2 % - 0 . 2 8 4 1 . 7 5 ? 0 . 6 6 2 0 . 6 3 3 2 0 8 3 4 1 2 4 7 . 0 3 5 4 0 9 5 9 0 . 7 6 7 - 1 . 1 5 1 - 0 . 2 8 % 1 . 7 5 7 0 . 4 8 3 0 . 6 0 6 2 1 2 6 4 2 8 0 7 . 5 3 6 8 0 9 6 1 0 . 7 8 2 - 1 . 1 6 8 - 0 . 2 8 4 1 . 7 5 7 0 . 4 9 8 0 . 5 8 9 2 1 4 9 4 3 1 4 8 . 0 3 8 1 0 9 8 4 0 . 8 0 5 - 1 . 2 0 0 — 0 . 2 8 4 1 . 7 5 7 0 . 5 2 0 0 . 5 5 7 2 2 0 6 4 3 4 8 8 . 5 3 9 3 0 9 9 9 0 . 8 2 3 - 1 . 2 2 4 - 0 . 2 8 4 1 . 7 5 7 0 . 5 3 8 0 . 5 3 3 2 2 4 8 4 3 8 2 9 . 0 4 0 2 0 1 0 0 8 0 . 8 3 6 - 1 . 2 4 2 - 0 . 2 0 4 1 . 7 5 7 0 . 5 5 2 0 . S 1 S 2 2 7 6 4 6 1 6 9 . 5 4 1 1 0 1 0 0 4 0 . 8 4 3 - 1 . 2 4 8 - 0 , 2 8 4 1 . 7 5 7 0 . 5 5 9 0 . 5 0 9 2 2 8 2 6 4 2 9 1 . 0 . 0 4 1 8 0 9 9 5 0 . 8 4 6 — 1 . 2 4 8 — 0 . 2 8 4 1 . 7 5 7 0 . 5 6 2 0 . 5 0 9 2 2 7 7 4 4 2 9 1 0 . 5 4 2 4 0 9 7 6 0 . 8 4 3 - 1 . 2 3 8 - 0 . 2 8 4 1 . 7 5 7 0 . 5 5 9 0 . 5 1 9 2 2 5 2 4 4 2 9 3 . 1 . 0 4 2 3 0 9 5 7 0 . 8 3 9 - 1 . 2 2 7 - 0 . 2 8 4 1 , 7 5 7 0 . 5 5 4 0 . 5 3 0 2 2 2 5 4 6 2 9 1 1 . 5 4 3 0 0 9 5 1 0 . 8 3 9 - 1 . 2 2 5 - 0 . 2 8 4 1 . 7 5 7 0 . 5 5 4 0 . 5 3 2 2 2 1 9 4 4 2 9 1 2 . 0 4 3 2 0 9 4 3 0 . 8 2 7 - 1 . 2 2 0 - 0 . 2 8 6 1 . 7 5 7 0 . 5 5 2 0 . 5 3 7 2 2 0 8 4 4 2 9 x P 1 e c u r a 3 . S t r e n g t h i . s a d e q u a t e a n d & J . 1 s c r s s s e s a r e w i t h i n a l l o w a b l a 1 j i t a . A p p l i e d S h e a r ( k i p s ) S h e a r S t r e n g t h ( k i p s ) ( f t . ) V d V a d V i V u t k - i n ) V c i V c w 0 . 0 5 . 6 0 . 0 2 5 . 3 5 6 . 0 6 9 0 9 9 9 . 9 7 2 . 7 6 1 . 8 * 4 4 0 . 5 5 . 6 0 . 0 2 6 . 2 5 2 . 4 1 1 5 2 2 1 1 . 8 6 3 . 9 5 4 . 3 ’ 1 . 0 5 . 4 0 . 0 2 4 . 2 4 8 . 7 1 6 2 9 1 5 5 . 4 6 2 . 4 5 3 . 0 1 . 5 5 . 2 0 . 0 2 2 . 2 4 5 . 0 2 1 0 7 1 3 6 . 4 6 8 . 1 . 5 7 . 9 2 . 0 4 . 9 0 . 0 2 0 . 3 4 1 . 4 2 5 8 8 1 1 8 . 6 7 3 . 4 6 2 . 4 2 . 5 4 . 7 0 . 0 2 0 . 3 4 1 . 1 2 5 2 3 1 0 6 . 1 7 4 . 4 6 3 . 2 3 . 0 4 . 5 0 . 0 1 8 . S 3 7 . 6 2 5 8 7 9 0 . 3 7 6 . 7 6 3 . 5 3 . 5 4 . 2 0 . 0 1 6 . 7 3 4 . 4 2 5 5 3 1 8 , 9 7 5 . 0 6 3 . 3 4 . 0 4 . 0 0 . 0 1 . 5 . 2 1 1 . 4 2 9 2 1 7 0 . 3 7 5 . 3 5 9 . 9 6 . 5 3 . 7 0 . 0 1 3 . 9 2 6 , 8 2 4 9 1 6 3 . 7 7 5 . 6 5 4 . 1 5 . 0 3 , 5 0 . 0 1 2 . 7 2 6 . 5 2 4 6 3 5 8 . 3 7 5 . 3 5 . 5 3 , 2 0 . 0 1 2 . 7 2 6 . 2 2 4 3 7 5 3 . 9 7 6 . 0 4 5 . 8 6 . 0 3 . 0 0 . 0 1 1 . 7 2 6 . 1 2 4 1 2 5 0 . 2 7 6 . 3 4 2 , 7 6 . 5 2 . 8 0 . 0 1 0 . 7 2 2 . 0 2 3 9 0 4 7 . 0 7 6 . 5 4 0 . 0 7 . 0 2 . 5 0 . 0 9 . 7 2 0 . 0 2 3 6 9 4 4 . 2 7 6 . 6 3 7 . 6 7 . 5 2 . 3 0 . 0 8 . 7 1 8 . 0 2 3 5 0 4 1 . 8 7 6 , 8 3 5 . 5 8 . 0 2 . 0 0 . 0 7 . 8 1 6 . 2 2 3 3 4 3 9 . 7 7 6 . 9 3 3 . 7 8 . 5 3 . . 8 0 . 0 7 . 8 1 5 , 8 2 3 1 9 3 7 . 8 7 7 . 1 3 2 . 2 9 . 0 1 . 5 0 . 0 7 . 0 1 6 . 0 2 3 0 6 3 6 . 1 7 7 . 2 3 0 . 7 9 . 5 1 . 3 0 . 0 6 . 2 1 2 . 3 2 2 9 5 3 4 , 5 7 7 , 3 2 9 . 3 1 0 . 0 1 . 1 0 . 0 5 . 5 1 0 . 8 2 2 8 5 3 3 . 0 7 7 . 4 2 6 . 0 1 0 . 5 0 . 8 0 . 0 5 . 0 9 . 7 2 2 7 8 3 1 6 7 7 . 4 2 6 . 9 1 1 . 0 0 . 6 0 . 0 5 . 0 9 . 4 2 2 7 3 3 0 , 5 7 7 . 5 2 5 . 9 1 1 . 5 0 . 3 0 . 0 4 . 7 8 . 5 2 2 6 9 2 9 . 4 7 7 . 5 2 5 . 0 1 2 . 0 0 . 1 0 . 0 4 . 4 7 . 6 2 2 6 8 2 8 . 3 7 7 . 5 2 4 . 0 S h e a r S t r e n g t h i S a d e o u a t c t h r o u g h o u t . P l u g v o i d s a t e n d s a s i n d i c a t e d . ( ‘ b ) Y 8 / 8 E / 2 8 4 1 8 : 5 1 2 5 3 8 5 2 4 9 5 5 C R M R N W D A L P A Y E S T A T E S D E T E I ’ I O N V A U L T D e s i g n C a 1 c u 1 a t i o r s f o r 1 2 . 5 i n U L T R J L S P A N S p L i c i o n . 1 2 . 5 i n t T h T R A S P A , f ’ c 8 0 0 0 9 5 ± ; 3 i n c h C o m p o s i t e T o p p i n g , f t — 3 0 0 0 p s i 1 0 - . 5 i n c h 2 7 0 k $ a n d , f e e 1 5 4 , Y s = 1 . 9 0 A 3 1 3 , X G 1 3 6 , Y = 6 , 4 8 , . Z J 3 = 2 4 7 , b w = 3 . 0 . 0 , A e — 2 7 2 , X c = 9 9 7 3 3 b c = 1 2 3 3 L e n g t h = 2 4 , 3 4 f t : L o a d i n g s : W g = 0 . 4 8 6 k / f t . 3 5 i n c l e s S o i l 1 2 0 p c f ÷ H 5 2 0 - 4 4 ) . y 4 j , . , 1 e f r i A ) L M U r ’ A 1 P p ’ v ’ 1 w r f X M o n l e n t s ( k i p - i n ) A p p i . S t r e s 8 P r e s t r e s s N e t S t r e s s S t r e n g t h ( f t . ) M d ‘ i s d l T o p o t t O o t t T o p B o t t M U 0 . 0 0 0 0 0 . 0 0 0 0 . 0 0 0 - 0 . 0 0 2 0 . 0 1 - 0 . 0 0 2 0 . 0 1 2 0 1 3 0 . 5 3 5 1 0 3 6 4 0 . 1 0 3 - 0 . 1 6 4 - 0 . 0 7 0 0 . 4 3 3 0 . 0 3 3 0 . 2 7 0 2 8 4 5 5 0 1 . 0 6 8 2 0 2 1 0 5 0 . 2 0 1 - 0 . 3 2 0 - 0 . 1 3 8 0 . 8 5 5 0 . 0 6 2 0 . 5 3 5 5 5 5 1 2 6 2 1 . 5 1 0 0 2 9 6 1 5 2 0 . 2 9 4 - 0 . 4 6 9 - 0 . 2 0 7 1 . 2 7 7 0 . 0 8 8 0 . 8 0 8 8 1 3 3 . 0 5 3 2 . 0 1 3 0 3 0 6 1 9 6 0 . 3 8 3 - 0 . 6 0 9 - 0 , 2 7 5 1 . 6 9 9 0 . 1 0 8 1 . 0 8 9 1 0 5 6 2 4 2 4 2 . 5 1 9 9 4 7 2 2 3 7 0 . 4 5 7 - 0 . 7 4 2 - 0 . 2 8 4 1 . 7 5 7 0 . 1 0 2 1 . 0 1 5 1 2 8 6 2 6 6 9 3 . 0 1 8 7 5 5 3 2 7 5 0 . 5 4 6 - 0 . 8 6 8 - 0 . 2 8 4 1 . 7 5 7 0 . 2 6 2 0 . 9 0 9 1 5 0 3 2 8 6 1 3 . 5 2 1 3 6 3 0 3 1 0 0 . 6 2 1 — 0 . 9 8 7 - 0 . 2 5 4 1 . 7 5 7 0 . 3 3 6 0 . 7 7 0 1 7 0 7 3 0 5 0 4 . 0 2 3 7 7 0 3 3 4 2 0 . 6 9 0 — 1 . 0 9 7 - 0 . 2 8 4 1 , 7 5 7 0 . 4 0 6 0 . 6 5 0 1 8 9 0 3 2 3 7 4 . 5 2 6 0 7 7 1 3 7 1 0 . 7 5 6 - 1 . 2 0 1 - 0 . 2 6 4 1 . 7 5 7 0 . 4 7 1 0 . 5 5 7 2 0 7 5 3 4 2 2 5 . 0 2 6 2 8 3 5 3 9 7 0 8 1 6 - 1 . 2 9 6 - 0 . 2 8 4 1 . 7 5 7 0 . 5 3 2 0 . 4 6 1 2 2 3 9 1 6 0 3 5 . 5 3 0 2 8 9 5 4 2 1 0 . 0 7 3 - 1 . 3 8 6 - 0 . 2 8 4 1 . 7 5 7 0 . 5 8 8 0 . 3 7 2 2 3 9 2 3 7 8 2 6 . 0 3 2 1 9 5 1 4 4 2 0 . 9 2 5 - 1 . 4 6 0 - 0 . 2 8 4 1 . 7 5 7 0 . 6 4 0 0 . 2 9 0 2 5 3 2 3 9 6 0 6 . 5 3 3 8 1 0 0 2 6 6 0 0 . 9 7 2 — 1 . 5 4 2 - 0 . 2 8 4 1 . 7 5 7 0 . 6 0 6 0 . 2 1 6 2 6 5 7 4 1 3 4 7 . 0 3 5 4 1 0 4 9 4 7 5 1 . 0 1 5 - 1 . 6 0 9 - 0 . 2 8 4 1 . 7 5 7 0 . 7 3 0 0 . 3 . 6 8 2 7 7 2 4 2 8 0 7 . 5 3 6 8 1 0 9 1 4 6 9 1 . 0 5 3 - 1 . 6 7 0 - 0 . 2 8 4 1 . 7 5 7 0 . 7 6 9 0 . 0 8 3 2 8 7 5 4 3 1 6 0 . 0 3 5 1 1 1 2 9 5 0 0 1 . 0 8 8 - 1 . 7 2 3 - 0 . 2 8 4 1 . 7 5 7 0 . 8 0 3 0 . 0 3 4 2 9 5 5 4 3 4 8 8 . 5 3 9 3 1 1 6 3 5 0 9 1 . 1 1 8 - 1 . 7 7 0 - 0 . 2 8 4 1 . 7 5 7 0 . 8 3 3 - 0 . 0 1 3 3 0 6 4 4 3 8 2 9 . 0 4 0 2 1 1 9 3 5 1 6 1 . 1 4 3 — 1 . 8 1 0 - 0 . 2 8 4 1 . 7 5 7 0 . 0 5 9 - 0 . 0 5 3 3 1 3 . 1 4 4 1 6 9 . 5 4 1 3 . 1 2 1 8 5 2 1 1 . 1 6 5 - 1 . 8 4 3 - 0 , 2 8 4 1 . 7 5 7 0 . 6 8 0 — 0 . 0 8 6 3 1 6 5 4 4 2 9 1 0 . 0 4 1 8 1 2 3 9 5 2 4 1 . 1 8 2 - 1 . 8 7 0 - 0 . 2 6 4 1 . 7 5 7 0 . 8 9 8 - 0 . 1 1 3 3 2 1 0 6 4 2 9 1 0 . 5 4 2 4 1 2 5 5 5 2 5 1 . 1 9 6 - 1 . 8 9 0 - 0 . 2 8 4 1 . 7 9 7 0 . 9 1 1 — 0 . 1 3 3 3 2 4 3 4 4 2 9 1 1 . 0 4 2 0 1 2 6 8 5 2 5 1 . 2 0 5 - 1 . 9 0 4 - 0 . 2 6 4 1 . 7 5 7 0 . 9 2 0 - 0 . 1 4 7 3 2 5 5 4 4 2 9 1 1 . 5 4 3 0 1 2 1 5 5 2 3 1 . 2 1 0 - 1 . 9 1 2 - 0 , 2 8 4 1 . 7 5 7 0 . 9 2 6 - 0 . 1 S S 3 2 7 7 4 4 2 9 1 2 . 0 4 3 2 1 2 7 9 5 1 9 1 . 2 1 1 - 1 . 9 1 3 - 0 . 2 8 4 1 . 7 5 7 0 . 9 2 7 - 0 . 1 5 6 3 2 7 8 4 4 2 9 u l e x u r a J . S t r e n g t h x i s a d e q u a t e a n d a l l s t r e s s e s a r e w i t h i n a l l c w a b l e l i t t i t s . A p p l i e d S h e a r ( k i p s ) M c r S h e a r S t r e n g t h ( k i p s ) C T U d V d V i V u ( k - i n ) 1 o j V c w — : - 5 , 5 1 6 . 6 9 . 3 4 6 . 8 6 8 7 9 9 9 . 9 5 7 . 0 4 8 . 4 k 0 . 5 5 . 5 1 6 . 6 8 . 7 4 5 . 9 1 0 4 9 2 0 9 . 3 5 6 . 0 4 7 . 6 1 . 0 5 . 6 1 6 . 1 6 . 2 4 4 . 1 1 4 2 7 1 5 3 . 0 5 2 . 4 5 3 . 0 1 . 5 5 . 2 1 9 . 4 8 . 2 4 2 . 7 1 8 1 1 1 3 3 . 2 6 8 . 1 5 7 . 9 2 . 0 4 , 9 1 4 . 5 7 . 7 4 0 . 6 2 2 0 2 1 2 2 . 7 7 3 . 6 6 2 . 4 2 . 5 4 . 7 1 3 . 9 7 . 3 3 8 . 4 2 1 5 1 1 0 1 . 6 7 4 . 4 6 3 . 2 3 . 0 4 . 5 1 3 . 2 5 . 8 3 6 . 3 2 0 3 4 8 5 . 4 7 4 . 7 6 3 . 5 3 . 5 4 . 2 1 2 . 5 6 . 4 3 4 . 2 1 9 2 3 7 3 . 8 7 5 . 0 6 2 . 7 4 . 0 4 . 0 1 2 . 8 5 . 1 3 2 . 4 1 8 1 6 6 3 . 2 7 5 . 3 5 3 . 7 4 . 5 3 . 7 1 1 . 0 9 . 9 3 0 . 8 1 7 2 0 5 8 . 1 7 5 . 6 4 9 . 4 5 . 0 3 . 5 1 0 . 3 5 . 5 2 8 . 7 1 6 2 7 9 2 . 4 7 5 . 8 4 4 . 6 5 . 5 3 . 2 9 . 6 5 . 2 2 6 . 7 1 5 4 1 4 7 . 7 7 6 , 0 4 0 . 5 6 . 0 3 0 8 . 9 4 . 8 2 4 . 8 1 4 6 Z 4 3 . 7 7 6 . 3 3 7 . 1 6 . 5 2 . 8 8 . 2 4 . 4 2 2 . 8 1 3 8 8 4 0 . 2 7 6 . 5 3 4 . 2 7 . 0 2 . 5 7 , 4 4 . 6 2 1 . 5 3 . 3 2 1 3 7 . 3 7 6 . 6 3 1 . 7 7 . 5 2 . 3 6 . 7 4 . ] . 1 9 . 6 1 2 5 9 3 4 . 6 7 6 . 8 2 9 . 4 8 . 0 2 . 0 6 . 0 3 . 8 1 7 . 7 1 2 0 4 3 2 . 1 7 6 . 9 2 7 . 3 8 . 5 1 . 8 9 . 3 3 . 5 1 5 . 6 1 1 5 6 2 9 . 9 7 7 . 1 2 5 . 4 9 . 0 1 . 5 4 . 6 3 . 2 1 4 . 0 1 1 1 3 2 7 . 9 7 7 . 2 2 3 . 7 9 . 5 1 . 3 3 . 8 3 . 0 1 2 . 2 1 0 7 7 2 6 . 0 7 7 . 3 2 2 . 1 3 . 0 . 0 1 . 1 3 . 1 3 . 0 1 0 . 9 1 0 4 7 2 4 . 3 7 1 . 4 2 0 . 7 1 0 . S 0 . 8 2 . 4 2 . 7 9 . 1 1 0 2 3 2 2 . 6 7 7 . 4 1 9 . 2 1 1 . 0 0 . 6 1 . 7 2 . 5 7 , 4 1 0 0 5 2 1 . 0 7 7 . 5 1 7 , 9 1 1 . 5 0 . 3 1 . 0 2 . 3 9 . 7 9 9 4 2 0 . 7 7 7 . 5 1 7 . 6 1 2 . 0 0 . 1 0 . 2 2 . 1 6 . 0 9 8 9 2 0 . 7 7 7 , 5 1 7 . 6 S h e a r S t r e n g t h i s a d e q u a t e t h r o u g h o u t . P l u g v o i d s a t e n d s a S i n d i c a t e d . ( * ) 1 / U b J 4 U 4 £ D . L L r c 4 I i C J N W I c c i o ( 4 2 5 ) z — H j J D A L P A Y & A S 3 O C . C O N S T R U C T I O N I R E T D N , W A 9 8 o 6 N O T i C O N C R E T E T E C ‘ I 4 3 3 N E S U N T B U W V . S C A L e T A A . P L A C E M E N T P L A N N f i T h C J . P . S L A B M A N H O L E B Y O T H E R S 0 $ U . T O P P I N G a R O T h E R S . ., • : ‘ : - ‘ a S . ‘ , • ‘ : . . . B D A M S B Y C i t ( N S T A t h B Y O T h E R S ) ‘ . 1 0 4 0 1 L • Y O T H E R S 1 2 k g H o l l o w C O I 4 E • A B D Y G I G , T Y P . ) 4 ’ X W G 1 0 H T . B E A I T H O S I R P B Y C i t ( I N S T A L L S R O M F A O W A L l ] 2 ’ — O 0 1 S T . D & 3 R 0 V D 5 % 4 ’ O A C T O ) $ E C T I O N ( A ‘ 1 - S E C T I O N R E F : S E C T . C C NO T E S 1. C I t WU . MS T A & L AI . I . 00 ( 0 4 . 1 1 5 R J I D F Si W J C 1 ’ J K A L _ _ C0 N N E C 1 1 o N A IN D C A 7 W ON 1 H E O9 A l 4 N O S . PE S f l T ( A • 7 0 N S r o ID 1 A N I C A L r w w o . o . c m I c A i . AN D AL L O1 1 4 L R IR A D t I A R 10 gE 10 . D T A L L E D Y O T h E R S . 2. nO . 0 I N 5 T A U . P D T R A 1 0 N 9 MU S T NO T IW 1 Y 5 1 W WI N PR E 5 T h E S N C 5 I R A N O SC C I I O N W o R L0 C A T I Q OF 5 A E Df t . L P d 9 A A & 3 P R 1 S O ST h A N O S 1 0 aE A S m *4 1 ( 1 . 27 0 k . ‘ 4 ’ — UN C O A 1 ! D 7 — * 4 IO W K N A I 1 O N . A — 4 HO L L O W CO R E f c - 8 , 0 0 0 P 0 0 0 • .O N T W T l’ c 3 0 P f VO O Fi L L h TO P P I N S f J , 0 0 0 p g 8. *1 . 1 . HO L L O W OO R E 1 5 gA L L e t GR O 4 J 1 D AS P 01 0 ’ S R C C D A 1 O N S . fl O . D NA N P I J N O AN D EC T 1 O N ’ 8 R O Q 1 U l WP U E D qT h 4 O F O R A 1 N .J W 4 f l T A L . 6. C N N H 0 L E . L OE ‘ I g T h U PI HO L L O W 0 O K A R $ , CA P i a s m SC L ., C E f l u J . OR I n I N o Po c m To PR E ’ S D 4 1 U A T A L PR O M W A i I N o IN T O VI D *1 W P L U 9 N 8 DR A I N S . DR A I N I4 O L S Id U S T D 0. . f A N E D OU T AF r t R O D 0 . O I R E CO H O 4 Z T E PO U R S AP Z CO I I f t E T E . CO N T R A C T O R MA Y PA T * I H 0 L . IF N A 1 I Y . ON C E ST R U C T U R E IS Vê A T H R PR O O F E D . 7. 90 L P R 1 L r ON 1) 6 8 DR A W N O FO R M U U I & AN D Wt á L I 1 AL L O W A . E I J 1 T OF Fl U . FR O . I TO F OF VA U L T TO B GR A 8 € . CO R T R A C T O R R O N t 10 MA I N T A I N HE 1 ( D T OF Fi L L B C 1 ) d TH E S E LI M I T S OR (t ’ I F O R N C i t OF 0 J E S DE F O R E MA N U F A C T U R E OF PR C C U C T . DI M E N S I O N S O R $A F E DR I L L I N G _ _ _ _ NO DP I C L R 4 G 4. — a — 3 j f f j 1 1 t • 11 1 . • 11 1 k — 14 : 1 J O B 00 0 0 9 A PR O D U C T : 12 . 5 IN C H RE V I S I O N : UN I T WT : 34 0 ‘$ I L F (H S Z O — 4 4 TR U Q ( L O A ’ l I + S L C 0 E R 0 1 2 0 PC I I MI N . S L 0 P T h so f l . o m — y— o SO I L PR O F I L E S E C T I O ! F me . — d 6 . I . l . o v $ i 1w M y . 6 . w . * . d b , My . g w l . w l 6 y 6 _ —. i e . , e 4 . i . m . . o 1 A C l I t h . 6 . . .d e u W ’ . b . Y e r e f l e b C T . . Ie _ • .O G Y CO R P . DA L P A Y ES T A T E S 12 11 2 ’ HO L L O W GO R E PL A C E M E N T Pt A N , J . . . i D DE T E N T I O N VA U L T I DE T A I L S AN D GE N E R A L NO T E S P— i ° A ° 1 N 1 0 N , WA S H I N G T O N 00 0 9 9 A — H 4 S I DO G DO 01 c a O D D D U D Of 01 0 0 0 0 0 O D D DO D 01 01 07 OD D I D O C DO D O D D 01 Of 01 01 J D D 0 0 0 DO G 0 0 0 03 D D - - I - FI L L w / GR O U T DY OT I - I E R S . TY P . o o 0 0 HO L L O W GO R E JO B QU A N T I T Y T A 2 U L 1 1 O N DA T E : 00 / 0 1 / 2 0 0 0 MA R K PI E C E PI E C E PI E C E TO T A L MI N I M U M NU M B E R 0T h ’ . WT . LE N Q T H LE N G T H ST R A N D S 9 9 - 01 31 8, 3 8 8 2 4 . 5 7 7 6 4 7 7 10 9 9 . 02 1 6 , 7 6 2 19 , 6 3 19 . 8 3 1 0 90 - 02 1 6 , 4 0 2 18 . 8 3 18 . 8 3 10 TO T A L 33 21 3 , 1 0 8 80 3 80 3 4 CO N T . D A C K RO O DY DI N E R S 6 3 d T I t ’ 2 / S 2 / t Tab 4.0 17884.001 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology The existing 1.66-acre site is primarily covered with trees. The only exception to this is lot 1, which was cleared with the original Dalpay Short Plat. There are no existing buildings on the site. Soils are Alderwood, which are considered to be "till" type soils. Based on site reconnaissance, available topography maps, and adjacent developments, there is no upstream contributing basin area as noted in Section 3.0. The natural discharge location for the site is the existing stream that discharges along the west boundary of the site. Please refer to the enclosed Existing Basin Area map for a graphic depiction of the site topography and characteristics. 17884.001 B. Developed Site Hydrology In the developed condition, the site will contain 4 residential lots with associated houses and driveways. An underground pipe conveyance system will be installed to convey stormwater runoff from the developed site (lots 2-4) to the detention vault located uner the Private Access Tract. This facility has been designed to provide the required detention and water quality for lots 2-4. Drainage facilities exist on the original Dalpay Short plat and were sized to accommodate the developed runoff from lot 1. The on-site tributary area to the proposed detention vault is approximately 0.38 acres per the enclosed Developed Basin Area map. All runoff routed to this facility will be detained to meet Level 2 Flow Control requirements and then treated before discharge to the stream. Please refer to the enclosed basin area map for a detailed breakdown of the on-site areas and land covers, as well as the calculations for the proposed detention vault. 17884.001 C. Performance Standards Based on the flow control application map located in the 2009 KCSWDM, this project is located within a Level 2 flow control area per the map. Therefore, the site is required to meet Level 2 flow control requirements. The proposed detention vault has been sized to meet these requirements. Based on the water quality application map located in the 2009 KCSWDM, this project is located within a Basic Water Quality Treatment area per the map. A Stormfilter is proposed to be installed downstream of the detention vault to meet this treatment requirement. 17884.001 D. Flow Control System The detention vault located in the Private Access Tract has been sized to meet Level 2 Flow Control requirements. The size of this vault is 12-feet by 60-feet and is designed for a live storage depth of 6.5 feet. Total volume provided is 4,680 Cubic-feet. Once detained, storm water will be routed through a Stormfilter before being discharged to the existing onsite stream. Please refer to the enclosed KCRTS calculations for further details on the sizing of this facility. As previously noted, the drainage facilities for the original Dalpay Short Plat located north of Lot 1 were sized to accommodate Lot 1. Therefore, no new facilities are proposed to accommodate the runoff from Lot 1. 17884.001 E. Water Quality System A Stormfilter has been proposed to provide the required water quality treatment for the developed runoff from lots 2-4 and the adjacent PAT. Calculations for this facility will be provided with the final construction plans and TIR. This Stormfilter will be sized and designed in accordance with the 2009 KCSWDM. Tab 5.0 17884.001 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN With the final engineering plans and TIR, this section will contain the typical calculations necessary for the sizing of the pipe facilities proposed on this project. The Rational Method and Manning's Formula will be used for the sizing purposes. Conveyance pipes will be sized to accommodate the 25-year storm event at a flowing full condition. Tab 6.0 17884.001 6.0 SPECIAL REPORTS AND STUDIES The following special reports and studies are included: 6.1 Geotechnical Engineering Study for Dalpay Short Plat prepared by Earth Solutions NW, LLC dated December 13, 2015 EarthSolutionsNWLLC EarthSolutions NW LLC Geotechnical Engineering Geology Environmental Scientists Construction Monitoring 1805 -136th Place N.E.,Suite 201 Bellevue,WA 98005 (425)449-4704 Fax (425)449-4711 www.earthsolutionsnw.com GEOTECHNICAL ENGINEERING STUDY DALPAY SHORT PLAT REDMOND COURT NORTHEAST RENTON,WASHINGTON ES-4208 2005 2015 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring EarthSolutionsNWLLC EarthSolutions NW LLC and Environmental Sciences Vicinity Map Dalpay Short Plat Renton,Washington MRS TJM 12/09/2015 Dec.2015 4208 1 NORTH NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. Reference: King County,Washington Map 626 By The Thomas Guide Rand McNally 32nd Edition SITE Plate Proj.No. Date Checked By Drwn.By E a r t h S o l u t i o n s N W L L C G e o t e c h n i c a l E n g i n e e r i n g , C o n s t r u c t i o n M o n i t o r i n g a n d E n v i r o n m e n t a l S c i e n c e s E a r t h S o l u t i o n s N W L L C E a r t h S o l u t i o n s N W L L C T e s t P i t L o c a t i o n P l a n D a l p a y S h o r t P l a t R e n t o n , W a s h i n g t o n MRS TJM 12/09/2015 4208 2 N O R T H 0 3 0 6 0 1 2 0 Sc ale in Feet1"=6 0 ' NOTE:This plate may contain areas of color.ESNW cannot be responsible for any subsequent misinterpretation of the information resulting from black &white reproductions of this plate. NOTE:The graphics shown on this plate are not intended for design purposes or precise scale measurements,but only to illustrate the approximate test locations relative to the approximate locations of existing and /or proposed site features.The information illustrated is largely based on data provided by the client at the time of our study.ESNW cannot be responsible for subsequent design changes or interpretation of the data by others. LEGEND Approximate Location of ESNW Test Pit,Proj.No. ES-4208,Nov.2015 Subject Site REDMOND COURT N.E. TP-1 TP-2 TP-3 TP-4 RE D M O N D PLACE N.E. N . E . 1 9 T H S T R E E T Veldyke II Short Plat Lot 1 Lot 2 Lot 3 Lot 4 380 390 400 410 420 380390 400 410 420 390 390 410 410 Rockery TP-1 Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring and Environmental Sciences EarthSolutionsNWLLC EarthSolutions NW LLC RETAINING WALL DRAINAGE DETAIL Dalpay Short Plat Renton,Washington MRS TJM 12/10/2015 Dec.2015 4208 3 NOTES: Free Draining Backfill should consist of soil having less than 5 percent fines. Percent passing #4 should be 25 to 75 percent. Sheet Drain may be feasible in lieu of Free Draining Backfill,per ESNW recommendations. Drain Pipe should consist of perforated, rigid PVC Pipe surrounded with 1" Drain Rock. LEGEND: Free Draining Structural Backfill 1 inch Drain Rock 18"Min. Structural Fill Perforated Drain Pipe (Surround In Drain Rock) SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAWING Drwn. Checked Date Date Proj.No. Plate Earth Solutions NWLLC Geotechnical Engineering,Construction Monitoring and Environmental Sciences EarthSolutionsNWLLC EarthSolutions NW LLC FOOTING DRAIN DETAIL Slope Perforated Rigid Drain Pipe (Surround with 1"Rock) 18"(Min.) NOTES: Do NOT tie roof downspouts to Footing Drain. Surface Seal to consist of 12"of less permeable,suitable soil.Slope away from building. LEGEND: Surface Seal;native soil or other low permeability material. 1"Drain Rock SCHEMATIC ONLY -NOT TO SCALE NOT A CONSTRUCTION DRAW ING Dalpay Short Plat Renton,Washington MRS TJM 12/10/2015 Dec.2015 4208 4 Tab 7.0 17884.001 7.0 OTHER PERMITS The City of Renton will be the governing body for the roadway, grading, and storm drainage construction of the project. A building permit and grading permit will be required for the construction of the proposed improvements. Other anticipated permits and information that will be required for the project are listed below: Postmaster / Mailbox Locations Approval Fire Marshal / Fire Hydrant Locations Approval Water Availability Certificate Sewer Availability Certificate Construction Stormwater General Permit (Department of Ecology) Forest Practices Permit (Department of Natural Resources) Tab 8.0 17884.001 8.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ANALYSIS AND DESIGN A. Erosion and Sediment Control (ESC) Plan Analysis and Design The erosion and sediment control plans for the Dalpay Short Plat will be prepared in accordance with the 2009 KCSWDM and will comply with standard industry practices throughout the construction process to limit the amount of sediment traveling into the downstream storm drainage systems. Temporary sediment traps will be constructed to provide sediment retention on site before discharging into the ground. The site's runoff will be conveyed from the roads and lot areas via temporary V-ditches with rock checkdams or sheetflow to the temporary sediment traps. Additional BMPs will be proposed as necessary and will include rocked construction entrances, silt fencing where needed, straw mulch for the areas that reach final grade in the lot areas, and hydroseeding. Clearing limits will be established per the final construction plans. The temporary sediment traps will trap sediment prior to any discharge offsite. Due to site topography and soil type, there is a risk for erosion. Standard erosion control measures noted in this section should be sufficient to control erosion and prevent sediment from leaving the site. Silt fence will be installed at all locations where sediment-laden runoff may potentially leave the site. Cover measures shall be provided by the contractor when necessary on stockpiled material and all disturbed areas. Temporary cover shall be installed if an area is to remain unworked for more than seven days during the dry season (May 1 to September 30) or for more than two days during the wet season (October 1 to April 30). During the wet season the contractor shall stockpile material necessary to cover all disturbed areas. Slopes and stockpiles 3H:1V or steeper with more than 10 feet of vertical relief shall be covered if they are to remain unworked for more than 12 hours. All disturbed areas will be paved, covered with a house, or landscaped with grass, shrubbery, or trees pursuant to the development plans to provide permanent erosion control. The Temporary Erosion and Sedimentation Control (TESC) analysis and design complies with the 2009 KCSWDM. The TESC elements are addressed as follows: Clearing Limits: The clearing limits will be shown on the final engineering plans and will be flagged in the field. The project is proposing to save existing trees where possible on the site. Cover Measures: Cover measures will be added in the TESC notes and on the final engineering plans. Perimeter Protection: Perimeter protection will be shown on the engineering plans (silt fencing). Traffic Area Stabilization: A stabilized gravel construction entrance will be shown on the engineering plans. Sediment Retention: Temporary sediment ponds will be proposed on the final construction plans to retain sediment onsite. 17884.001 Surface Water Control: Interceptor ditches will be shown on the final engineering plans and will be implemented if needed. Dust Control: Dust will be controlled by water trucks if necessary. Wet Season Construction: Construction will be conducted according to the City of Renton standards during the wet season. Construction within Sensitive Areas and Buffers: There is an existing Native Growth Protection Easement on the site for steep slopes and a creek. The project is not proposing and construction in this area. Maintenance: Maintenance requirements will be detailed in the TESC notes on the final engineering plans. Final Stabilization: Upon completion of the project, all disturbed areas will be stabilized and Best Management Practices removed if appropriate. B. Stormwater Pollution Prevention Plan This report will be prepared with the final engineering plans and TIR. Tab 9.0 17884.001 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT These items will be completed with the final engineering plans and TIR. Tab 10.0 17884.001 10.0 OPERATIONS AND MAINTENANCE MANUAL The drainage facilities on this project will be private facilities owned and maintained by the Homeowners Association. Therefore, an Operation and Maintenance Manual will be provided with the final construction plans and TIR.