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Storm Drainage Analysis - PLN General - 12/30/2013
STORM DRAINAGE ANALYSIS for the PROFESSIONAL & COMMERCIAL BUILDING BELFAIR HOME CENTER, BELFAIR,WA. Client: First Olympic Holdings, LLC Attn: Chris Reanier P.O. Box 997 Gig Harbor,WA 98335 Ph: (253) 405 4414 By: N.L. Olson & Associates,Inc. 2453 Bethel Avenue SE A G Port Orchard,WA 98366 (360) 876-2284 Proje 8 17-13 1D1P PN E o AN 17 2014 OF AS yr6 W.CEJD-A R STD 379 is'r 0 ty A FG/S'T6�E G1� SIONAL �} December,2013 PROFESSIONAL & COMMERCIAL BUILDING BELFAIR HOME CENTER, BELFAIR,WA. TABLE OF CONTENTS I. INTRODUCTION....................................................................PG. 1 II. PROPOSED STORMWATER IMPROVEMENTS.............................PG. 1 III. UPSTREAM ANALYSIS...........................................................PG. 2 IV. DOWNSTREAM ANALYSIS.............................................................PG. 2 V EROSION AND SEDIMENTATION CONSTRUCTION IMPACTS MITIGATION (with SWPPP Narrative)...................PG. 2 VI. DESIGN CALCULATIONS: A. PARAMETERS..............................................................................PG. 8 B. STORMWATER FACILITY DESIGN......................................PG. 8 1. EXISTING CONDITIONS................................................ PG. 9 2. DEVELOPED CONDITIONS......................................PG. 9 3. WATER QUALITY BASIN...................................... PG. 10 4. WATER QUALITY DESIGN......................................PG. 10 5. CONVEYANCE DESIGN........................................PG. 11 6. DESIGN DATA.....................................................PG. 11-20 APPENDIX A- LIST OF FIGURES FIGURE 1 -VICINITY MAP FIGURE 2 -EXISTING CONDITIONS MAPS FIGURE 3 -DEVELOPED CONDITIONS STORM PLAN FIGURE 4 -MINUMUM TECHNICAL RERQUIERMENTS FLOW CHART FIGURE 5 - WWWHM3 WATER QUALITY (SCREENSHOT) FIGURE 6 - WWWHM3 100-yr FLOW (SCREENSHOT) APPENDIX B—FILTERRAO INFORMATION Washington State Department of Ecology G.U.L.D. Filterra® Details ii Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 1 of 20 I. INTRODUCTION: First Olympic Holding LLC proposes to redevelop a 0.40 acre portion of a developed approximately 3.9-acre parcel for the placement of a two story professional and commercial building of type"B"construction. The building is to be located adjoining the south side of the existing Belfair Home Center and is a redevelopment of existing commercial space. The project includes removal of an existing residence(since demolished, approximately 2,800 sf)and approximately 3,000 sf of commercial space located on the south side of the True Value building. Portions of sidewalk and asphalt pavement near the proposed building are improved. The project includes construction of a two-story building(approximately 14,880 sf),associated sidewalk, and pavement replacement(total new impervious area is approximately 4,800 sf). Re-striping of parking areas and minor landscaping are also proposed. Construction also includes the use of an existing connection to the regional sanitary sewer system located in Belfair Street just south of the site and existing Belfair water service water meter located also in Belfair street. The site's address is 51 NE State Route 300 STE A, Belfair, and is located approximately 200 if west of Old Belfair Highway and State Route 3 intersection within the Belfair Home Center plaza. The Tax parcel number is 12329-42-00190. The site is currently zoned 53 -(Trade- General Merchandise)as are the properties to the north and east.Properties to the west are zoned Medium density residential. The site is situated in the Northeast Quarter of the Northeast Quarter of Section 29,Township 23 North,Range 1 West, Willamette Meridian,Mason County, Washington(See Appendix A Figure 1). In addition to the Site Plan Review Permit from the Mason County Department of Community Development a permit to work in public ROW will be required for certain improvements. Other permits may be required. The site is generally flat with a slight 3% slope to the west. Majority of the site is covered with asphalt bordered with asphalt curb. Stormwater runoff from the site drains east and west. Runoff flowing to the east enter an existing storm system located in the center of the existing parking lot access fronting McLendon's Hardware store.runoff flowing to the west accumulates in a low area of the access road behind the building center. This water flows under a chain link fence and through lawn area of a residence to enter Belfair Creek drainage course approximately 10'beyond the property line and fence. This is also the discharge outlet location of a 36" concrete culvert that runs under the entire Belfair Home Center complex and serves as conveyance for Belfair creek from east to west. II. PROPOSED STORMWATER IMPROVEMENTS: The proposed stormwater improvements include a system of on-site storm drain pipes and catch basins which will convey rooftop and site runoff from the improved areas to discharge to an existing concrete culvert pipe via cored drilled connection. Storm water runoff from new asphalt surface is to be treated(enhanced treatment)prior to discharge. Runoff from new roof and a portion of awning surfaces is to be collected and conveyed to the existing core drilled 36" 1 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 2 of 20 concrete culvert that runs under the site. Due to existing site conditions an eight inch saw cut into the side of the side of the existing 36"concrete culvert is proposed. This connection will improve discharge of storm water from the west side of the site. Small amounts of runoff from limited areas of improvement located on the east side of the site are allowed to continue to sheet flow as in the existing condition to the existing storm system on site. An approximately 4,800 sf net increase of impervious area is proposed. Per Technical Minimum Requirements flow chart (See Appendix A figure 4), The project does not exceed the threshold for additional mitigation beyond minimum requirements 1-5. III. UPSTREAM ANALYSIS: Based on review of the site and the topographic survey runoff, from adjacent areas is limited to a portion of Belfair road between the southern property line and the roads centerline, as shown in Figure 3 of Appendix A. upstream areas are insignificant. IV. DOWNSTREAM ANALYSIS: The site discharges to west to a low spot of the access road behind the west side building center. This runoff flows to Belfair creek just beyond the property line fence (approximately 10') to the outlet of the 36" diameter concrete culvert that provides conveyance of Bethel Creek under the site. Runoff from pollution generating impervious surfaces of the redeveloped areas is to be rr ioretetnion prior to discharge from the site.Discharge of captured water is treated,(via Filte a b )p g g p via 8" diameter CPEP connected to the 36" diameter concrete culvert located under the site near the west property line. V.EROSION AND SEDIMENTATION CONSTRUCTION IMPACTS MITIGATION: The potential erosion and sedimentation impacts during the construction of this project include transporting and depositing sediments off the site. During the required earthwork a substantial portion of the site will be disturbed.The vegetative cover will be removed and the soil exposed. Therefore, efforts to mitigate these potential impacts include the construction of silt fences and inlet control. A. CONSTRUCTION SEQUENCE AND PROCEDURE The Contractor will be responsible for implementing the following erosion control and stormwater management control measures. The Contractor may designate these tasks to certain subcontractors as he sees fit,but the ultimate responsibility for implementing these controls and ensuring their proper functioning remains with the general contractor. The order of activities will be as follows(refer to Site Plan Sheet for details): 1. Install perimeter silt fences in the locations shown on the T.E.S.C.plan. 2. Begin clearing and operations to the extent as specified by plan. 2 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 3 of 20 3. Commence site grading. Grading is to be kept at minimum for immediate construction. Topsoil is to be stockpiled on site for replacement in lawn areas. 4. Provide temporary diversion for existing drainage way if required 5. Disturbed soil areas of the site where construction activity has ceased for more than 14 days shall be temporarily seeded and watered or covered with straw. 6. Finalize subgrade preparation. 7. Install base material as required 8. Carry out final grading and seeding and planting 9. Remove silt fencing only after placement of all gravel is complete and exposed surfaces are stabilized. 10. Remove sediment from conveyance system as necessary. B. SOIL STABALIZATION AND SEDIMENT TRAPPING Soil stabilization and sediment trapping procedures for this site include: 1. Silt fences shall be installed and maintained as per T.E.S.C.Notes and Details for Silt Fences on the plan sheet. 2. The temporary inlet protection shall be installed and maintained per T.E.S.C. Plan See details for inlet protection. 3. Permanent seeding and planting of all un-paved or landscaped areas using the hydromulching grass seeding technique. The paved access adjacent to the site entrance will be inspected daily and swept as necessary to remove any excess mud, dirt, or rock tracked from the site. The job site superintendent will be responsible for seeing that these procedures are followed. C. PERMANENT EROSION CONTROL AND SITE RESTORATION All ditches, swales, and exposed soils are to be covered with grass. The contractor shall ensure all grass has taken root and is healthy before project completion. The maximum slope allowed on the site at the completion of final grading is to be 2:1. 3 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 4 of 20 D. INSPECTION SEQUENCE OF TESC The following inspection and maintenance practices will be used to maintain erosion and sediment controls. 1. All control measures will be inspected at least every 7 days and within 24 hours after any storm event greater than 0.5 inches of rain per 24 hour period. 2. All measures will be maintained in good working order, if repairs are found to be necessary, they will be initiated within 24 hours of report. 3. Built up sediment will be removed from silt fence when it has reached one-third the height of the fence. 4. Silt fences will be inspected for output of sediment,tears, etc.,to see if the fabric is securely attached to the fence posts, and to see that the fence posts are securely in the ground. 5. Temporary and permanent seeding will be inspected for bare spots, washouts, and healthy growth. 6. The job site superintendent will be responsible for selecting and training the individuals who will be responsible for these inspections. 7. Personnel selected for the inspection and maintenance responsibilities will receive training from the job site superintendent. They will be trained in all the inspection and maintenance practices necessary for keeping the erosion and sediment controls that are used onsite in good working order. E. CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS 1. Waste Disposal All waste materials will be collected and stored in a securely lidded metal dumpster rented from a local waste management company which must be a solid waste management company licensed to do business in the State of Washington and Mason County. The dumpster will comply with all local and state solid waste management regulations. All trash and construction debris from the site will be deposited in the dumpster. The dumpster will be emptied a minimum of once per week or more often if necessary, and the trash will be hauled to a landfill approved by Washington State and the Mason County. No construction waste materials will be buried on site. All personnel will be instructed regarding the correct procedures for waste disposal. 4 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 5 of 20 Notices stating these practices will be posted in the job site construction office trailer, and the job site superintendent will be responsible for seeing that these procedures are followed. 2. Sanitary Waste All sanitary waste will be collected from the portable units a minimum of once per week by a licensed portable facility provider in complete compliance with local and state regulations. 3. Hazardous Substances and Hazardous Waste a. All hazardous waste materials will be disposed in the manner specified by local, state, and/or federal regulations and by the manufacturer of such products. The job site superintendent, who will also be responsible for seeing that these practices are followed, will instruct site personnel in these practices. Material Safety Data Sheets (MSDS's) for each substance with hazardous properties that is used on the job site will be obtained and used for the proper management of potential wastes that may result from these products. An MSDS will be posted in the immediate area where such product is stored and/or used and another copy of each MSDS will be maintained at the job site construction trailer office. Each employee who must handle a substance with hazardous properties will be instructed on the use of MSDS sheets and the specific information in the applicable MSDS for the product he/she is using, particularly regarding spill control techniques. b. The contractor will train all personnel in the proper cleanup and handling of spilled materials. No spilled hazardous materials or hazardous wastes will be allowed to come in contact with stormwater discharges. If such contact occurs, the stormwater discharge will be contained on site until appropriate measures in compliance with state and federal regulations are taken to dispose of such contaminated stormwater. It shall be the responsibility of the job site superintendent to train all personnel in the proper cleanup and handling of spilled materials. C. Any spills of hazardous materials that are in quantities in excess of Reportable Quantities as defined by EPA regulations shall be immediately reported to the EPA National Response Center 1-800-424-8802. d. In order to minimize the potential for a spill of hazardous materials to come into contact with stormwater,the following steps will be implemented: 1) All materials with hazardous properties (such as pesticides, petroleum products, fertilizers, detergents, construction chemicals, acids,paints, 5 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 6 of 20 paint solvents,cleaning solvents, additives for soil stabilization, concrete curing compounds and additives, etc.) will be stored in a secure location, under cover, when not in use. 2) The minimum practical quantity of all such materials will be kept on the job site. 3) A spill control and containment kit (containing, for example, an absorbent such as kitty litter or sawdust, acid neutralizing power, brooms, dust pans, mops,rags, gloves, goggles,plastic and metal trash containers, etc.) will be provided at the storage site. 4) All of the product in a container will be used before the container is disposed of. All such containers will be triple-rinsed with water prior to disposal. The rinse water used in these containers will be disposed of in a manner in compliance with state and federal regulations and will not be allowed to mix with stormwater discharges. 5) All products will be stored in and used from the original container with the original product label. 6) All products will be used in strict compliance with instructions on the product label. 7) The disposal of excess or used products will be in strict compliance with instructions on the product label. 4. Contaminated Soils a. Any contaminated soils (resulting from spills of materials with hazardous properties)that may result from construction activities will be contained and cleaned up immediately in accordance with applicable state and federal regulations. b. The job site superintendent will be responsible for seeing that these procedures are followed. Per Mason County Stormwater Pollution Plan submittal checklist the following narrative of the Stormwater Pollution Prevention Plan is provided for the Belfair Home Center Professional and Commercial Building drainage report. Construction Storm Water Pollution Prevention Narrative Narrative: 6 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 7 of 20 Section 1: Elements 1-12 of the Construction Stormwater Pollution Prevention minimum requirements: Element 1: Preservation of Vegetation/Marking of Clearing Limits: The existing conditions, demolition and TESC plan sheet 2 of the civil plan set clearly delineates proposed clearing limits of approximately 19,000 s£ Clearing limits are established from the eastern the property boundary abutting proposed improvements to the eastern edge of the main access to the parking lot. Element 2: Construction Access: No construction access is proposed as existing asphalt and paved access entrance is a suitable substitute. Grading on the site is expected to be minimal, no export is expected and construction is expected to be conducted in the dry season therefore a wheel wash is considered not necessary. Element 3: Controlling Flow Rates: Erosion from expected storm water flows during construction are mitigated by the installation of catch basin inlet protection in existing catch basins. A detail is provided on sheet C2.1 of the plan set. Construction is to take place in the dry season, conveyance runs are relatively short, and storm water flows are expected to be very limited. If construction is during raining season additional measures may be required. Element 4: Installing Sediment Controls: Sediment controls include the installation of inlet protection for ex catch basins. Element 5: Stabilizing Soils: Instruction for the stabilization of soils is provided on sheet C2.1 of the civil plan set. Element 6: Protecting Slopes: There are no slopes on site. Element 7: Protecting Drain Inlets: Drain inlets/outlets are protected by the use of drain inlet protection, see sheet C2.1 of the civil plan set. Element 8: Stabilizing Channels and Outlets: Discharge is to existing piped storm system, no stabilization is proposed. Element 9: Controlling Pollutants: Instructions for control of pollutants are provided within the drainage report see TESC section page 4. Element 10: Controlling De-Watering Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 8 of 20 De-watering form the installation of the foundations or other construction is provided by the installation of inlet protection for catch basins Elementl 1: Maintaining Best Management Practices: All erosion control BMPs are to remain in place until the site is stabilized. Element 12: Management of the Project: The soil disturbances shall be phased where possible to limit the area of un-stabilized soils to a minimum required for construction activities in a given time period. Limitations and instructions are provided on sheet C2.0 ,and C2.1 of the civil plan set and within the erosion control section of the storm report. Section 2-6: Project description, existing conditions, areas, and soil: For sections 2-6 see body of the storm report(pages 1-2). This section includes the project description, existing conditions, critical areas and soil types and locations. Section 7: Potential erosion problem areas: Construction site sediment transport potential worksheet is provided. There is no area of particular concern. However, it is important that inlet protect in be provided for existing catch basins. Section 8: Construction phasing: It is our understanding that construction is to take place during the dry season and no phasing is proposed. Section 9: Construction schedule: Construction schedule is not known at this time. Section 10: Financial/ownership responsibilities It is understood at this time that First Olympic Holding LLC has sole financial responsibility for the project site. Section 11: Engineering calculations: See storm report. Section 12: CESCL: Responsible TESC lead is to be determined at pre-construction conference. Contact numbers shall be provided at the pre-construction conference. VI. DESIGN CALCULATIONS: A. PARAMETERS: 1. Stormwater Runoff: 8 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 9 of 20 In accordance with the Mason County Stormwater Design Manual, and the DOE 2005 Storm water Design Manual for Western Washington(runoff shall be computed using the Western Washington Hydrology Model,version 3 (WWHM3), which is a continuous flow model based on historic rainfall data. Minimum requirements 1-5 are required for this development, flow control is not proposed 2. Water Quality Mitigation: In accordance with the Mason County Stormwater Design Manual,and the DOE 2005 Storm water Design Manual for Western Washington (runoff shall be computed using the Western Washington Hydrology Model, version 3 (WWHM3), alternative method for water quality mitigation is proposed. system designed for treatment of the water quality design flow rate (flow rate at or below which 91%of the runoff volume will be treated) will be used. Specifications and manufacturer's recommendations are included in Appendix B Filterra® Storm Treatment device. This device has received a General Use Level Designation(GULD) for enhanced treatment from the Washington State Department of Ecology. As such, the Filterra®system will be designed per the GULD procedures for enhanced treatment. 3. Technical requirements: In accordance with the 2005 Western Washington Stormwater Design Manual and WSDOE GULD procedures for enhanced treatment. 4. Computer Software Used: Computer software used is Storm Shed Software for hydrology(Version 6.1.3.2) by Ingenious Systems,Inc., Western Washington Hydrology Model, version 3 (WWHM3) by Clear Creek Solutions(for water quality), and F1oPro 2.0 by ProSoft Apps. 5. Rainfall Precipitation: Quilcene rain gauge,precipitation factor of 0.800. 6. Area delineation for Basins: AeX=Existing Area Adev=Developed Area B. STORMWATER FACILITY DESIGN 1. Existing Conditions The existing site area(AeX=0.43 acres) is analyzed for land cover. Flow control is not proposed. However itemized description of the basin is provided for minimum technical requirements review. Pervious= 0.15 acres of landscaping land cover (6,733sf) Moderate Slope, Type C Soil Impervious= 0.12 acres of buildings (2,733sf+2,428sf) Moderate Slope Impervious= 0.15 acres of asphalt(5,936sf) Moderate Slope Impervious= 0.02 acres of buildings (787sf) Moderate Slope 9 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 10 of 20 See Appendix A Fig. 2 for Existing Conditions Map. 2. Developed Conditions The developed site area(Adev=0.43 acres) is analyzed for the relative proportions of pervious and impervious surfaces. Site runoff will be routed to the site water quality device and culvert discharge. The following conditions are assumed for the basin: sidewalks 2 310 s Flat Slope Impervious—0.06 acres of ( , sf) p Impervious=0.17 acres of rooftops,building (7,440 sf) Flat Slope Impervious=0.16 acres of asphalt(6,917 sf) Moderate Slope Pervious =0.04 acres of landscaping (1,950 sf) Flat Slope, Type C Soil Note existing impervious area= 11,884 sf, proposed impervious area=16,667 difference =4,783 sf. Thus total new impervious area is less than 5,000 sf,thus minimum technical requirements are not exceeded. 3. Water Q tvuali Basin The developed site area(Adev=0.23 acres) is analyzed for the relative proportions of pervious and impervious surfaces. Site runoff will be routed to the site water quality device and culvert discharge. The following conditions are assumed for the basin: The basin contains portions of sidewalk and landscaping asphalt all flows are intermingled and all are considered imperious for purposes of analysis, (See Appendix A Figure 3) Impervious= 0.23 acres: sidewalks, asphalt, landscaping. Moderate Slope 4. Water Quality Design: Enhanced treatment is proposed for this project. The Filterra®catch basin is designed per the Washington State Department of Ecology General Use Level Designation for Enhanced Treatment. The Filterra®unit must be simulated as a sand filter in WWHM3 with the criteria as follows: Filter media depth: 1.8 feet Ponding Depth: 0.75 feet Side Slopes: Vertical Riser Height: 0.70 feet Filter Hydraulic Conductivity: 24.82 (for Enhanced treatment) Other Criteria: Basin: 0.23 acres impervious(captured newpavment) Road, Moderate slope Riser Diameter: 100 inches (runoff overflows Filterra® inlet to downstream catch basin) 10 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 11 of 20 Given the above criteria, the model must demonstrate infiltration(treatment) of at least 91%of the total incoming runoff. Filterra® size: try 10' x 6' (smallest size) Results: 91.07 % infiltrated: (See figure 5 appendix A) Thus, a 6' x 10' Filterra®unit is specified for water quality. 5. Conveyance Design: With the 100-yr flow rate of 0.40 cfs, and proposed pipe sizes at 8". Conveyance is adequate by inspection. 6. Design Data: WWHM3 DATA WWHM3 Screenshots have been cropped for display purposes only WWHM3 DATA 4 Existing Conditions Basin 4 Developed Conditions Basin + Water Quality Basins 4 Sand Filter (Filterra®) Results a. Sand Filter Stage Discharge Table Sand Filter Results Western Washington Hydrology Model PROJECT REPORT Project Name: 8217 WQ Site Address: City Report Date : 12/26/2013 Gage Quilcene Data Start : 1955/10/01 Data End 1999/09/30 Precip Scale: 1.22 11 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 12 of 20 WWHM3 Version: PREDEVELOPED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use Acres C,Forest,Flat .18 Impervious Land Use Acres Element Flows To: Surface Interflow Groundwater Name Basin 1 Bypass: No GroundWater: No Pervious Land Use Acres Impervious Land Use Acres ROADS FLAT 0.23 Element Flows To: Surface Interflow Groundwater filterra, filterra, Name : filterra Bottom Length: 6ft. Bottom Width: IOft. Depth: 0.75ft. Side slope 1: 0 To 1 Side slope 2: 0 To 1 Side slope 3: 0 To 1 Side slope 4: 0 To 1 Filtration On Hydraulic conductivity: 24.82 Depth of filter medium: 1.8 Discharge Structure Riser Height:0.7 ft. 12 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 13 of 20 Riser Diameter: 100 in. Element Flows To: Outlet 1 Outlet 2 Sand Filter Hydraulic Table Stage(ft)Area(acr)Volume(acr-ft)Dschrg(cfs)Infilt(cfs) 0.000 0.001 0.000 0.000 0.000 0.008 0.001 0.000 0.000 0.000 0.017 0.001 0.000 0.000 0.000 0.025 0.001 0.000 0.000 0.000 0.033 0.001 0.000 0.000 0.000 0.042 0.001 0.000 0.000 0.000 0.050 0.001 0.000 0.000 0.000 0.058 0.001 0.000 0.000 0.000 0.067 0.001 0.000 0.000 0.000 0.075 0.001 0.000 0.000 0.000 0.083 0.001 0.000 0.000 0.000 0.092 0.001 0.000 0.000 0.000 0.100 0.001 0.000 0.000 0.000 0.108 0.001 0.000 0.000 0.000 0.117 0.001 0.000 0.000 0.000 0.125 0.001 0.000 0.000 0.000 0.133 0.001 0.000 0.000 0.000 0.142 0.001 0.000 0.000 0.000 0.150 0.001 0.000 0.000 0.000 0.158 0.001 0.000 0.000 0.000 0.167 0.001 0.000 0.000 0.000 0.175 0.001 0.000 0.000 0.000 0.183 0.001 0.000 0.000 0.000 0.192 0.001 0.000 0.000 0.000 0.200 0.001 0.000 0.000 0.000 0.208 0.001 0.000 0.000 0.000 0.217 0.001 0.000 0.000 0.000 0.225 0.001 0.000 0.000 0.000 0.233 0.001 0.000 0.000 0.000 0.242 0.001 0.000 0.000 0.000 0.250 0.001 0.000 0.000 0.000 0.258 0.001 0.000 0.000 0.000 0.267 0.001 0.000 0.000 0.000 0.275 0.001 0.000 0.000 0.000 0.283 0.001 0.000 0.000 0.000 0.292 0.001 0.000 0.000 0.000 0.300 0.001 0.000 0.000 0.000 0.308 0.001 0.000 0.000 0.000 0.317 0.001 0.000 0.000 0.000 0.325 0.001 0.000 0.000 0.000 0.333 0.001 0.000 0.000 0.000 0.342 0.001 0.000 0.000 0.000 0.350 0.001 0.000 0.000 0.000 0.358 0.001 0.000 0.000 0.000 13 C) to o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O --1 ON ON ON CN O% Q\ C� ON ON Q\ C% ON in lh in In vi in LA in In In in (A ? .P 1�. .P 4� Jl- ? 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'C CD CD 0. ., o.. o YM Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 15 of 20 Pervious Land Use Acres Impervious Land Use Acres ROADS FLAT 0.21 ROOF TOPS FLAT 0.17 Element Flows To: Surface Interflow Groundwater Name Basin 2 Bypass: No GroundWater: No Pervious Land Use Acres C,Forest,Flat .5 Impervious Land Use Acres Element Flows To: Surface Interflow Groundwater MITIGATED LAND USE ANALYSIS RESULTS Flow Frequency Return Periods for Predeveloped. POC#1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Flow Frequency Return Periods for Mitigated. POC#1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 15 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 16 of 20 50 year 0 100 year 0 Yearly Peaks for Predeveloped and Mitigated. POC#1 Year Predeveloped Mitigated Ranked Yearly Peaks for Predeveloped and Mitigated. POC#1 Rank Predeveloped Mitigated POC#1 The Facility PASSED The Facility PASSED. Flow(CFS)Predev Dev Percentage Pass/Fail 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 16 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 17 of 20 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 17 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 18 of 20 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass Water Quality BMP Flow and Volume for POC 1. On-line facility volume: 0.0667 acre-feet On-line facility target flow: 0.01 cfs. Adjusted for 15 min: 0.0803 cfs. Off-line facility target flow: 0.0415 cfs. Adjusted for 15 min: 0.047 cfs. Flow Frequency Return Periods for Predeveloped. POC#2 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Flow Frequency Return Periods for Mitigated. POC#2 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 Yearly Peaks for Predeveloped and Mitigated. POC#2 Year Predeveloped Mitigated Ranked Yearly Peaks for Predeveloped and Mitigated. POC#2 Rank Predeveloped Mitigated POC#2 The Facility PASSED The Facility PASSED. 18 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 19 of 20 Flow(CFS)Predev Dev Percentage Pass/Fail 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass ' 19 0z sst,d 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 sst,d 0 0 0 0000*0 ssud 0 0 0 0000*0 sst,d 0 0 0 0000*0 sst,d 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 sst,d 0 0 0 0000'0 sst,d 0 0 0 0000'0 sst,d 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 sad 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssPd 0 0 0 0000*0 ssud 0 0 0 0000"0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 ssud 0 0 0 0000*0 ssud 0 0 0 0000'0 OZJO OZ aoud sisXIuud 02vu►ula uuolS `dM 1u31a9`IQIUOD auioH.nu3139 Ouippng iui3launuOD put,it,uotssOJOld Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 21 of 20 21 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 22 of 20 Re 'Edit View Het) ..........::................__ ,�❑ �® � 1, kW FF,,a 2 t FW Ee " M 803POC3Mkioated flow! Flow Frequency ® l0E 1 Flo.(CFS) 0803 2 Year = 0.1943 P -- 5 Year 0.2394 p 10 Year - 0.2707 25 Year = 0.3119 U 10E 0 " 50 Year = 0.3439 ` 100 Year= 0.3770 Se° 51; early Pe3ca 0 00......0000#'O0000000000000000o a -- 10E-1 ° o 0 1956 0.4694 1957 0.2589 1950 0.23D0 1959 0.2043 1960 0.1510 10E-2 1961 0.1976 �`, 1 10 20 30 40 50 60 70 80 90 99 1962 0.2026 Cumulative Probability 1963 0.1540 `7 1964 0.1705 1965 0.2332 t Duatiora Fbw Frealenty i Ware Oualdy Hy&ograph Wetland Flu:tuatsxr 1966 0.3080 1967 0.1884 -: Analyze dalasets 1968 0.1860 501 PQC1 Predeyelw vd flow 1969 0.1850 503POC3Prerievebpedflo4 1970 0.1741 -. 76j Inflow to POC-1 Mitigated. 1971 0.2323 ,801 P1')O'1 MrTgatCdfltwr, 1972 0.2068 BDPOC 2A1 Bow 1973 0.1721 - 'f000f#araALL!OUTLETS Mitigated 1974 0.2435 1001 Qpre OUTLET 1 M�ti9etod' 1975 0.2423 _ 1976 0.2099 Al Datasets Flow Stage j-P�reciy� Evap 1977 0.2131395 POC1 T-POC2 l PDC.3 1979 0.1066 1979 0.1866 1980 0.2186 12/24/2013 6:57 AM 22 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 23 of 20 APPENDIX A-LIST OF FIGURES 23 Professional and Commercial Building Belfair Home Center,Belfair WA Storm Drainage Analysis Page 24 of 20 24 APPENDIX A-LIST OF FIGURES i OP �0 �O NE CU�aN LN 3 �l 0 J po O w m � O _J O SITE 5� N.E. BELFAIR ST. A PORTION OF THE N.W. 1/4 OF THE S.E. 1/4, OF SEC. 29, T.W.P. 24 N., R. 1 W., W.M., IN MASON COUNTY, WASHINGTON VICINITY MAP NOT TO SCALE Demolition and Removal Legend: = REMOVE EXISTING ASPHALT PAVEMENT(-4.000 SF) F77-1 REMOVE EXISTING CONCRETE SIDEWALK(-1.000 SF) APPROXIMATE LIMITS OF CONSTRUCTION 0. REMOVE EXISTING BUILDING(-4.000 SF) I g Scale: 1"=20' f L 0y, ir'<00k 0) L C: A—mad (SEE NOTE 2) -1 EX V., ....... C, 20 0 20 10 CT) J 11 if Scale in Feet .Z. C) 0 i t La REMOVE EXISTING ASPHALT 5,936 SF 01, �0 r4 REMOVE EXISTING BUILDINGS 5,161 SF EX STORM DRAIN(TYP+--- IN PROTECTION TO BE PRONIDE;D 11. REMOVE EXISTING LANDSCAPING 6,733 SF ------(SE DETAIL SHEET CZI # 18,617 SIT =0.43 AC A REMOVE EXISTING ASPHALT PAVEMENT FOR LANDSCAPING 366 SF /e A REMOVE EXISTING Of 787 SF 2 0 REMOVE EXISTING ASPHALT 2,762 SF --q u r �. {221 gg' b`ygtl,Ey 3 �,:( Y';, / z 1�d 4 «!. % } %sue r t s sM1a / ----— --------.I 4 u r'4 00 z REMOVE EXISTING HOUSE DECK & WALKS Ln 0 2,733 SF 4 `' 'ti* yK. >; j � ll ''y/ I REMOVE EXISTING BUILDING C" T 2,428 SF 0 ..... .............. C W co 1.1+00.00 -—-— —--—- 11+00.00 -—-—-—-—-—-—-—- 12+OO.Oq__ -—-—-—-—-—-—- 13+00.00 14�+ .OD -—-—-—-—-- �'fj- z Nair Street T 7 P i -r \E —M Z,�:4 CO xw V1, - U7 44 REMOVE EXISTING LANDSCAPING 6,693SF \�ER' EMOVE EXISTING ASPHALT =2,86`8 SF 0 REVISIONS BY DATE SIC PLAN FOR First Olympics Holding,LLC SCALE" AS SHOWN A DEMOLITION AND TE DATE- DECEMBER9,2013 DESIGNED RHL 12 1 Attn:Chris Reanier I NO. DATE BY DESCRIPTION di'�AN.L.Olson&Associates,Inc. COMMERCIAL BUILDING,BELFAIR HOME CENTER NUMBER:cc p.o.Box 997 DRAVANG NUM CL DRAWN Fi;;L 12/13 F-qirweriry. Plarr-ifiq cirw Swr%p%irv: 379 Belfair Street,Belfair,WA. u Gig Harbor,WA 98335 118217- 0 CHECKED NLOU 12/13 (360)876-2284 MAL Site Development Permit 253 405 4414 407816 z APPROVED PORTION OF THE N.W.1/4 OF THE SA 1/4,OF SEC,29, 5ACCEPTED 2453 BethelA-.,.P.O.B..637.Port Or�hd.WA 9B366 T.W.P.24 N.,IL I W.,W.M-,IN MASON COUNTY,WAS1914GTON SHEET 2•COMPACTED DEPTH, 'T t7 ,Y,/// HMA 1/2•(PG COMPACTED DEPTH58-22) . 6•BASE COURSE 'TYPICAL ASPHALT SECTION COMPACTED DEPTH ........... _ NOT TO SCALE 1 + —•-- 1 + _ _ - T�r PROPOSED SIDEWALK 2,310 SF tale: 1"_20' PROPOSED ASPHALT 6,917 SF PROPOSED BUILDING (ROOF) 7,440 SF 1 :• ' f '� -- - y l _ nnruM �t„7 t '... < .__. __— y•` tfn\. �I ' / Assumed ° PROPOSED LANDSCAPING 1950 SF �: 07_2) r, 18,617 SF � i t �- -- :. 0. =0.43 AC - LANDSCAPING ' 1 i zo a zo :o -f...fi Scale 2T2Feet TYT t A/ _........ n., NOT TO SCALE _ E ({(jj !'y CZ3/8'TO 1/2'R % filterra unit o 0 0 FFE=47.52 �- OWNER ER N PROPOSED 2-S Y BUILDING: DISCRETION I OT PREMOlIED JOINT FlLLER7' ! 1 FIRST iL00R: ETAIL) 7.440 SF (APPROXIMATE / t AA• !• r. r .! I AL) 7Am SF LOCATION) o EXPANSION JOINT 1 I t 14.6BOSF ZI 11 BUILDING NOTE 1 I (7,440 SF) CONWE7C CURB SHALL BE ANCHORED TO EXISTPIC PAVEMENT BY USING O MMEAVE MEETING iNE REOnREMENIS I 10• 5 M.5.0.0.T.8-26 FOR iWE 8 ' I;I ,•�/ EPDXY RE9N. t,'? I OC ., :. • -T/2 EX,R Dm p SIDEWALK (ALL) w C94CRETE NRO U h _ ..... ; ry rCOMPACTED OEP RA _ C< _ _ _ ---- - --- - r.�..-.,max=_�.��_�._�:,Mtr •• Tr Y auPACTEO OEPM °sTc .T•w1,MH+ 10+00.0() it -._.__...._r : C COMPACTED DEPTH '— - .� i2+00-00 - - Vl - --- '—'---- ------------'-----'----- — O LN BASE C 4 .T. _ S' _ _ EXTRUDED CONCRETE CURB DETAIL _•n r--. P m NOT M SCALE k!:-ti',C T Belfair Street Nam. P'. ` •- T...._ ,_--.._ ___ ,. __ ;._ - �.. P _ P__ P. __..:_ - - — — , C Li 7('Ti?':n J' -[:.a RIM: VARIES 5'MIN, 4q4+ V 7RACUOI JDNT 2'COMPACTED DEPTH Fl-DETAA ON MIS 91EET)'AI/2'(PG 56-22) 6w.w.4.m. ASPHALT 6,917SF WATER QUALITY BASIN2'COMPACTED DETH IC CJRB/ (0.23ac) (VOTE CS,TCYAX) s COMPACTED DEPtN L y BASE COURSE r -- — — THE APPROXIMATE LOCATION OF EXISTING UNDERGROUND UTILITIES •C y/" _� ARE SHOWN ON THE PLANS. IT IS THE CONTRACTOR'S RESPONSI- l0 ^ SILITY TO DETERMINE THE LOCATION OF EXISTING UTILITIES PRIOR - `� •\.\ /` - TO COMMENCING WORK. THE CONTRACTOR SHALL BE RESPONSIBLE c y 0 9°, './• 2 3/r EVAN51O1 JOINT h ,2,. y/,•_ / T (SEE DETAIL ON THIS SHLET) FOR DAMAGES THAT MIGHT BE OCCASIONED BY THENDERROUNCONTRACTOR'S FAILURE TO LOCATE, PRESERVE AND PROTECT UNDERGROUND UTILITIES. �, n}'=` F-IZ EXPM19Cfl AWi 20.O.C. COMPACVD7E0 DEPTH C0N/0.°`'°"n 5 O.C. CALL 4$ HOURS ' MONOLITHIC CONCRETE CURB AND SIDEWALK DETAIL BEFORE YOU D I G to811 'O NOT TO SCALE - a` LEEo OJ o o SITE PLAN. FOR: First Olympics Holding,LLC SCALE As MBE ti -gyp REVISIONS I 8r DATE DATE DEccPt,THER Io.zDI3 ,�#3 DESIGNED RHL to TOM /•� Attn:Chris Reamer N0. GATE BY _ L-'J N.L.Olson&Associates,IT1C. Q PROFESSIONAL&COMMERCIAL BUILDING, P.O. ox 997 oRAwNc NUMBER- DESCRIPTION a DRAWN RHL 10 13 r":in=eTir•.;, Plan'in: m!: $urti�yin;i ''+o +ra7g19 e` BELFAIR HOME CENTER118217— t GI Harbor,WA 98335 o -- oIECKEo NLOI 10/13 (360)876-2284 £sir°NA4 Belfair Street,Belfair,WA.Site Development Permit 253 405 4414 407818 Z _ APPROVED A PORTION OF THE N.W.I M OF THE S.F.114,OF SEC.29, SHEET C3.0 ACCEPTED 2453 Bethel A—,P.O.BMX 637.Pat O[Chad,WA 98366 T.W.P.24 N.,R.1 W.,W.M.,IN MASON COUNTY,WASHINl7TON Does dit:pioiccl icsillil ill:,000 mplZirt:ICCL 0.1 lilt); ot it IhO Effld diS11.11101112 activil'y Swull-t: II Ye No Minimum Regt,isentent 1 throll,91?5#5 apply to, RecItlilt:'llielil",#2 iypk-"; tlxe ahard su;ttiesrii the land'' ! disturbed. Next Question Does the proJect add 5,000 square feet or more of new hard surfaces? OR Convert 14 acres or more of vegetation to lawn or landscaped areas? OR Convert 2.5 acres or more of native vegetation to pasture? Yes No Next V Question I""miml.irri Requirements apply to the Is this a road All hard surfaces and the converted related project? - vegetation areas. Yes Does the project add 5,000 square feet or more of new hard surfaces? Yes No Do new hard surfaces add 50%or Is the total of new plus replaced hard surfaces more to the existing hard surfaces 5,000 square feet or more,AND does the value within the project limits? of the proposed improvements—including interior improvements—exceed 50%of the assessed value(or replacement value)of the No Yes existing site improvements? No additional requirements No V Yes -1 o additional II requirements All Minimum Requirements apply to the new and replaced hard surfaces and converted vegetation areas. Figure 2.4.2—Flow Chart for Determining Requirements for Redevelopment Volume f-Minimum Technical Requirements-August 2012 2-11 Fh Edo 'J'.ew He0 - .... it SO—t3c 4,Fken M-Jgated SCENARIOS Facil_y t+MAede��a Downstreame Connections Ip No— Outlet1 — OO utl et2 J _ Outlet? R N41 ty :. R Recpiafion AocGed oFa�ry �'_ - _...._._1 r•YO M e AoobdroFacuy, FI FMFNr4 - Facility Bottom Elevation(ti) 0 --- _- Facility Dimensions ®� ® pq�L Outlet Structur _.. ._.. _....__.. Bosom Wdh Tp Rae Ne4'r Otl C7 Effect"D.A®� ® R'sar DieieNe(nl CO Lan Side Sbw Rae Typ It t Side sl p- 0 Nd hTS'De = ICI y RO t Side Slope -� Orifice Di'meter�;ght (M' Tpp Sid.SYse + Number n t ds Infiltration yES'•� Hyde�ic Cadcrip6Jh) 2t.87. Fit.—WW&Whl 1.8.:.-":"! 2 F07'--HFg ._--H p TddVokum h all 52361 3 f0--'.- -:i B TddV.L—Though A.aeaAl 5.134 i- TMAWk—l—,Al 57.M tier SiorepeVduro at Rae Head .001 j Move E4amrt: Percent Fleed 51.07 Perdlnerames Shm Pond Table ope,Tabie. J { 5 ,Y Load KY{ _. _.... _... _. ,_.12/302013 836AM. r 7 1� Q MMM3 8217 W F$e Edt View Heb fi ® (91W PO . IV Anay a ._ ® t0E 1 803ROC3Mitig fW aw, rlov rmgoency _ -- £lor(C£S) 0603 2 Year 0.1943 _ 1 5 Year 0.2394 ___....._' ® 10 Year 0.2707 10E 23 Year 0.3119 50 Year - 0.3439 100 Year- 0.3770 O 000 oe00000000�'0000000000 0 0 0 0 0 0 0 0 0° Yearly Peaks J 1 OE 1 ° 1956 0.4694 1957 0.2589 _ 195E 0.2300 ' 1959 O'2043 1960 0.1510 �- IOE-2 1961 0.1976 ,- 1 10 20 30 40 50 60 70 80 90 99 1962 0.2026 Cumulative Probability196 1964 .110 a.17D5 Du lbns 1965 0.1332 Fbw Frequency Water Quaky H aph Wetland FkcWation 1966 0.3080 Analyze datasNs 1967 0.1884 1968 0.1864 501 F'OC 1 Ptedeveloped flow 1964 0.1850 =_ 503 POC 3 Predevelooed Flow 1970 0.1741 701 Infbw to POC 1 Mitigated 1971 0.2323 801 POC 1 Mayated flow 1972 0.2063 B(2 POC 2 M ed flow ' 1973 0.1721 1U00fkata ALLOUTLETS Mitigated 1974 0.2435 1D01 Awe OUTLET/Mttigated 1975 0.2423 u 1976 0.2099 "'- Al Dataseb 1977 0.1395 .r Fbw St Precq�--Evap 197 0.2139 —POC i —POC2 � POC3 j 1979 0.1866 1980 0.2186 12I24/2013 6:57 AM ,_, r, V APPENDIX B-FILTERRA®INFORMATION Washington State Department of Ecology G.U.L.D. Filterra®Details Y A H I16I CN STA iE C EP AAt w I T S Ot EC 0 L 0 C Y June2013 GENERAL USE LEVEL DESIGNATION FOR BASIC (TSS),ENHANCED, & OIL TREATMENT CONDITIONAL USE LEVEL DESIGNATION FOR PHOSPHORUS TREATMENT For Americast Filterra� lEcol®uv's Decision 1 ,� to r �. e = Based on Americast's submissions,including the Final'Technical Evaluation Report, dated December 2009 and additional information provided to Ecology dated October 9, 20©9, Ecology hereby issues the following use level designations:' LW 1. A General Use Level Designation for Basic,Enhanced,and Oil Treatment. r • Sized for Basic and Oil Treatment using a filter hydraulic conductivity of 35.46- .� inches/hour(assuming a hydraulic gradient of 1.41 inch/inch as listed in the TER). '' • Sized for Enhanced Treatment using filter.hydraulic conductivity of 24.82 inches/hour(assuming a hydraulic gradient of 1.41 inch/inch as listed in the TER) • The Filterra2'unit is not appropriate for oil spill-control purposes.. 2. A Conditional Use Level Resignation for Phosphorus Treatment , • Sized for Phosphorus Treatment using a filter hydraulic conductivity of 35.46 s inches/hour(assuming a hydraulic gradient of 1.41 inch/inch as listed in the TER) 3. Ecology approves the Filterra®units for treatment at the hydraulic loading rates listed! above,to achieve the maximum water quality design flow rate Calculate the water quality,design flow rates using the following procedures t N • Western<Washington: For treatment installed upstream of detention or retention, the water quality design flow rate is the peak 15-mim ite flow rate as calculated using the sand filter module in the latest version of the Western Washington hydrology Model or other Ecology-approved continuous runoff model.The model must indicate the unit is capable of processing 91 percent of the influent runoff file. • Eastern Washington:For treatment installed upstream of detention or retention, the water quality design flow rate is the peak 15-minute flow rate as calculated using one of the three methods described in Chapter 2.2.5 of the Storm ater'11anagement Manual for Eastern Wasbington(SWMIEW) or local manna]. � • Entire State: For treatment installed downstream of detention,the water quality t design flow rate is the full 2-year release rate of the detention facility. 4: 1 4. The Conditional Use Level Designation for Phosphorus treatment expires on December 1,2014 unless extended by Ecology,and is subject to the conditions specified below. 5. The General Use Level Designation has no expiration date but Ecology may revoke or amend the designation,and is subject to the conditions specified below. r Ecology's Conditions of Use: Rf RIP Filterra units shall comply with these conditions shall comply with the following conditions; 1. Design,assemble,install,operate,and maintain the Filterra units in accordance with applicable AmericastFilterra.manuals,document,and the Ecology Decision. 2. Each site plan must undergo Filterra review before Ecology can approve the unit for site_installation. This will ensure that site grading and slope_are appropriate for use of A Filterra� unit. 3.1 Filterra�media shall conform to the specifications submitted to and approved by Ecology; 4 ' Maintenance includes removing trash,degraded mulch,and accumulated debris from the filter surface and replacing the mulch layer. Use inspections to determine the site- specific maintenance schedules and requirements. Follow maintenance procedures given in the most recent version of the Filterrao Operation and Maintenance Manual. 5. Filterra�commits to submitting a QAPP by January 31,2013 for Ecology review and approval of a new test site that meets the TAPE requirements for attaining a GULD for phosphorus treatment. Filterra must submit a QAPP and monitor a minimum of one site where the unit wrill provide phosphorus treatment. 6. Filterra shall submit a TER for Ecology review for phosphorus treatment by December-1,2013. 7. Filterra units come in standard sizes. The minimum size filter surface-area is determined by using the sand filter module in the latest version of WWHM or other Ecology approved continuous runoff model for western Washington and single event model for eastern_Washington. Model inputs include a. Filter media depth: 1.8 feet b Effective Ponding Depth: 0.75 feet(This is equivalent to the 6-inch clear zone between the top of the mulch and the bottom of the slab plus 3-inches of mulch.) c. Side slopes:Vertical d. Riser height: 0.70 feet e.- Filter Hydraulic Conductivity: Use the hydraulic conductivity as described in paragraphs l and 2(depending on the level of treatment required)under Ecology's Decision,above. 8. Filterra9 may request Ecology to grant deadline or expiration date extensions,upon showing cause for such extensions. Ecology does not view lack of funds to complete the monitoring as sufficient cause for time.extensions. 2 •anogb,pagposap oouup!a Omlapour aqi Ouisn Iiun pzb,puels oql jo am ail ammaiap isnur ioa asap oqj`uun D-mij p galas o,l, -Z -2znloniis a p of suorioauuoo @did a5mgosrp zalourerp zaftl moue of zagwugo xoq uorlounf ajuzudas u alelodloour oslp ub,o lopotu D-giZ3 agZ -pauada d si ssud,�q moll g2iq pup luoumazi uloq �3urpiAold amTonuis DiSms p uogm apuz2 snonuiluoo u uo pasn oq oslu kew pup suorlujaguoo Pup sazrs 30 Xjauu.l u ut pamlop3nuuur sr Iaporu D-ql j_q aqs -smolt xpad pal>aziun 3o sspdXq Ouiprnozd`oor-luo adld-Sums u qi nwgi pa�zerlosT si pup ziam fMI auml aql enoqu asiz moll ivauuuazl lilunb zalpm agido ssaoxa uX snlold-zagwtgo iuounra.0 uoijrjij lolq ail oI Talur gzna aqi gOnozgi iiun eql�ur.ialua smog Tuauilra.g sloanp ivauoduzoa itam frp o aiunU jumaim uy-oml iallnp u 2uolu suoiioazrp gjoq wozd smog idaoob,Ilrnt pup uotlrpuoo ,,duznS„.ro �pS> p ui pasn oq of IaPoLu D-MIj mp pouRisop aualpl=aimmuls ej&is auo ur sspdcgAwU q� q Ipuzalui pup`zaqurugo iuourlpazi uoriuolazoiq`lalui gzrio u salmodzoour (D-9113)tapour OnD-ssed�g jtuz2lul pzrall!d aqs=ssudXg Iuuzalul uizaaT!3 oq j T �'gIL3 q_mD—sse Ag Ieu.raiul eaiaii!3 9XZI d-EFII,d 9XOI d-EII.Id 98t0-0 _ _ t,690'0 9X8 d-911:4 68£0'O _j 9990'0 9X9 J-9114 Z6Z0'0 LIf7O'0 bX8 d-RIJA 6SZ0'0 OL£0'0 _ bx9 d`911-4 176I0'0 I 8LZ0'0 bxb d-gllA 0£I0'O 5810'0 luouuuazl, Iumnuaz I sruogdsogd aZIS 1iu1-I paoub,gag pup`asp310/1t0`otspg d-gI l3 (SJo)mold alsact uznurixuN OUIZIS iuouzluaj L iTU4 d-MIJ -anoqt!pag zosop sisAluuu gurlopoui aqT&u sn�rrm oql jo ezis lurilou aql ouiurialaP tipgs nok*Iron d-Mid alj 3o azis aqi oiuruilso of aigrL Aurmolloj mp wosj uorjpu;Tzo�Iul aqi as fl :aiemrlsg 2uiziS lu!IIUI 'Z 'amlonzis aql)no Xanuoo pup adid pallols oqI ssudXq of anuuuoo smolt zagf!H-uaiv zaiupld puailicl agldo aouJzns doi aqi iano smog uDisap aqi aszadsip uagl Iugl saiuld gsplds do sau2s p of gpnoigj doze of smoU uOisap mollE of odid poilols aql pajzanur uzzagr,d -;did pawls 1puzaiur up g2nozgj aznlonzls oql zalua smolt 3luad pub,smolt amlduo u2isaa-surezp 3ooz zo/puu surpzp gouazl sialur palpi�5`suimp uasu uzoz3 mop ur-padld zoj smoilL odi T ss Eg IcTii@iul uualIij aqI -I (d-E[I.Ld)adid-ssedig Ieusajul r..raa)pj suo!jeanDguo,J aiuuaailV pano.r F 'Slalenti 2u!n!a3a.1 uj suo>aelou spjepueis Xjgvn6.ia;ehr of alnq!.r;uoa 10 asuea iou Begs si!un eaaal1i3 agi uro zI sa aegasrQ •6 Filterra Bioretention,Shallow: � Lk � � 1. The Filferra'Bloretentiori Shallow provides additional flexibiiity'for design engineers and designers in situations where there is limited depth and various elevation constraints to applying a standard Filterra configuration.Engineers can design this system up to six inches shallower than any of the previous Filterra unit configurations noted above. 2. Ecology requires that the Filterra Bioretention Shallow provide a contact time equivalent to that of the standard unit. This means that with a smaller depth of media,the surface area must increase. 3. To select a Filterra Bioretention Shallow System unit, the I designer must first identify the size of the standard unit using the modeling guidance described above. 4. Once you establish the size of the standard Filterra unit using the modeling technique described above,use information from the following table to select the appropriate size Filterra Bioretention Shallow System unit.` Shallow Unit Basic,Enhanced,and Oil'Tr'eatin-ei Sizing Standard Depth Equivalent Equivalea Shallow Depth 4x4 _ 4x6 or 6x4 -------4x6 or 6x4 ------�--------_ 6x6. ----- _-_--_ 4x8 or 8x4 ; 6x8.or,8x6 `6_x6_--_—_-_---i—_--_—_--6x10 or'TD_x6 _ 6x8 or 8x6 _ _ _ 6x12 or 12x6 - -�6x10 or1Ox6 7x13 orl3x7 Notes: 1. Shallow Depth Boxes are less than-the standard depth of 3.5 feet but no less than 3,0,:feeG deep,(TC tq INV Applicant: Filterra Bioretention Systems,division of Americast,Inc. Applicant's Address: 11352 Virginia Precast Road Ashland,VA,23005 Application Documents: • State of Washington Department of Ecology Application for Conditional Use Designation,Americast(September 2006) • Quality Assurance Project Plan Filterrag Bioretention Filtration System Performance Monitoring,Americast(April 2008) • Quality Assurance Project Plan Addendum Filterrao Bioretention Filtration System Performance Monitoring,Americast(June 2008) • Draft Technical Evaluation Report Filterrao Bioretention Filtration System Performance Monitoring,Americast(August 2009) • Final Technical Evaluation Report Filterrag Bioretention Filtration System Performance Monitoring,Americast(December 2009) 4 • Technical Evaluation Report Appendices Filterra'�'Bioretention Filtration System Performance Monitoring,Americast,August 2009 Draft) • Memorandum to Department of Ecology Dated October 9,2009 from Americast,Inc. and Herrera Environmental Consultants • Quality Assurance Project Plan Filterra Bioretention System Phosphorus treatment and Supplemental Basic and Enhanced Treatment Performance Monitoring,Americast (November 2011) • Filterra letter August 24,2012 regarding sizing for the Filterra Shallow System. • University of Virginia Engineering Department Memo by Joanna Crowe Curran,Ph. D dated March 16,2013 concerning capacity analysis of Filterra internal weir inlet tray. • Terraphase Engineering letter to Jodi Mills,P.E. dated April 2,2013 regarding Terraflume Hydraulic Test,Filterra Bioretention System and attachments. Applicant's Use Level Request: General Level Use Designation for Basic, Enhanced,and Oil Treatment and General Use Level for Phosphorus Treatment. Applicant's Performance Claims: Field-testing and laboratory testing show that the Filterra"'unit is promising as a stormwater treatment best management practice and can meet Ecology's performance goals for basic, enhanced and oil treatment and has the potential to meet Ecology's goal for phosphorus treatment. Findings of Fact: 1. Filterrar`completed field-testing at two sites at the Port of Tacoma. Continuous flow and rainfall data collected during the 2008-2009 monitoring period indicated that 89 storm events occurred. The monitoring obtained water quality data from 27 storm events. Not all the sampled storms produced information that met TAPE criteria for storm and/or water quality data. 2. During the testing at the Port of Tacoma,98.96 to 99.89 percent of the annual influent runoff volume passed through the POT1 and POT2 test systems respectively. Stormwater runoff bypassed the POT 1 test system during nine storm events and bypassed the POT2 test system during one storm event. Bypass volumes ranged from 0.13%to 15.3%of the influent storm volume. Both test systems achieved the 91 percent water quality treatment-goal over the 1-year monitoring period. 3. Consultants observed infiltration rates as high as 133 in/hr during the various storms. Filterra did not provide any paired data that identified percent removal of TSS,metals, oil,or phosphorus at an instantaneous observed flow rate. 4. The maximum storm average hydraulic loading rate associated with water quality data is <40 in/hr,with the majority of flow rates<25 in/hr. The average instantaneous hydraulic loading rate ranged from 8.6 to 53 inches per hour. 5 5. The field data showed a removal rate greater than 80%for TSS with an influent concentration greater than 20 mg/l at an average instantaneous hydraulic loading rate up to 53 in/hr(average influent concentration of 28.8 mg/l,average effluent concentration of 4.3 mg/1). 6. The field data showed a removal rate generally greater than 54%for dissolved zinc at an average instantaneous hydraulic loading rate up to 60 in/hr and an average influent concentration of 0.266 mg/l(average effluent concentration of 0.115 mg/1). 7. The field data showed a removal rate generally greater than 40%for dissolved copper at an average instantaneous hydraulic loading rate up to 35 in/hr and an average influent concentration of 0.0070 mg/1(average effluent concentration of 0.0036 mg/1). 8. The field data showed an average removal rate of 93%for total petroleum hydrocarbon (TPH)at an average instantaneous hydraulic loading rate up to 53 in/hr and an average influent concentration of 52 mg/1(average effluent concentration of 2.3 mg/1). The data also shows achievement of less than 15 mg/I TPH for grab samples. Filterra provided limited visible sheen data due to access limitations at the outlet monitoring location. 9. The field data showed low percentage removals of total Phosphorus at all storm flows at an average influent concentration of 0.189 mg/l(average effluent concentration of 0.171 mg/1). We may relate the relatively poor treatment performance of the Filterre system at this location to influent characteristics for total phosphorus that are unique to the Port of Tacoma site. It appears that the Filterrat system will not meet the 50 percent removal performance goal when you expect the majority of phosphorus in the runoff to be in the dissolved form. 10. Filtena performed laboratory testing on a scaled down version of the Filterrat unit. The lab data showed an average removal from 83-91%for TSS with influents ranging from 21 to 320 mg/L, 82-84%for total copper with influents ranging from 0.94 to 2.3 mg/L, and 50-61%for orthophosphate with influents ranging from 2.46 to 14.37 mg/L. 11. Filterra�'conducted permeability tests on the soil media. 12. Lab scale testing using Sil-Co-Sil 106 showed percent removals ranging from 70.1%to 95.5%with a median percent removal of 90.7%,for influent concentrations ranging from 8.3 to 260 mg/L. Filterra"'ran these laboratory tests at an infiltration rate of 50 in/hr. 13. Supplemental lab testing conducted in September 2009 using Sil-Co-Sil 106 showed an average percent removal of 90.6%. These laboratory tests were run at infiltration rates ranging from 25 to 150 in/hr for influent concentrations ranging from 41.6 to 252.5 mg/l. Regression analysis results indicate that the Filterrat'system's TSS removal performance is independent of influent concentration in the concentration rage evaluated at hydraulic loading rates of up to 150 in/hr. 6 Contact Information: Applicant: Chris French Filterra Bioretention Systems, division of Americast, Inc. 11352 Virginia Precast Road Ashland,VA 23005 (800)752-1427 (voice)(804) 798-8400(fax) cfrench(a]fiilterra.com Applicant's Website: http://www.filterra.com Ecology web link: htti)://w�N w.ecy.wa.goy/programs/wa/stonnwater/ne Ntech/index.litml Ecology: Douglas C.Howie,P.E. Department of Ecology Water Quality Program (360)407-6444 douglas.howie(a)ecy.wa.gov Date Revision December 2009 GULD for Basic,Enhanced,and Oil granted,CULD for Phosphorus September 2011 Extended CULD for Phosphorus Treatment September 2012 Revised design storm discussion,added Shallow System. January 2013 Revised format to match Ecology standards,changed Filterra contact information February 2013 Added FTIB-P system March 2013 Added FTIB-C system April 2013 Modified requirements for identifying appropriate size of unit June 2013 Modified description of FTIB-C alternate configuration 7 PLEASE PRINT AND FAX OR EMAIL THIS FORM 7/06-v07d Filterra®Project Information Form Complete&send to Americast by email,fax or mail. Address: 11352 Virginia Precast Rd Toll Free: (866)349 3458 Fax: (804)798-8400 fl Ite rfa" Ashland,VA 23005 (804)798-6068 Email: Suoaort(cbfilterra.com A G—mg I"i,Smnnw—Fd—i— Project Information Engineering Contact Information Project Name/Number: Engineering Firm: Current Date: 7993 West Hills S.T.E.M.Academy Expansion N.L.Olson&Associates,Inc 3-Sep-13 Regulatory Municipality and State(City,County,etc.): Contact: Phone: Kitsap County,Washington Ron Johnson,Richard Langford 360-876-2284 Target Treatment Rate: Email: Fax: Enhanced Treatment,85%TSS,91%total runoff treated rjohnson nlolson,com, rlangfor(@nlolson.com 1360-876-1487 Filterra®Details(Email,mail or fax plans to Americast-Acceptable formats are AutoCAD or pdf) Plans sheets should include(1)cover,(2)grading,(3)drainage areas,(4)stormwater schedules or profile,(5)landscaping&(6)Filterra®details. Filterra Structure# 1 Filterra Size(ID ft) Throat L x W 4 X 4 Filterra Drainage Area Acres 0.0826 Runoff Coefficient C Factor 0.90(impervious) Filterra Spot Elevation TC 134.35 FL 133.85 INV OUT 130.85 Bypass Spot Elevation TC 133.6 FL 133.1 Bypass or Effluent INV IN 130.8 Modified Structure YIN? N Grate or Top Options Y/N? N TC=Top Curb,FL=Flow Line FLP Detail on plans(Y/N)C� CGT Detail on plans(Y/N) FT Plan Notes shown(Y/N)0 Page 1 of 4 Ron Johnson From: Duane Vincent[dvincent@filterra.com)on behalf of Filterra Support[support@filterra.com] Sent: Tuesday, September 10, 2013 7:46 AM To: Dan Laughlin; Ron Johnson Subject: RE:West Hills S.T.E.M. Filtera Port Orchard, WA Follow Up Flag: Follow up Flag Status: Red Ron, Thank you for specifying Filterra® Stormwater BMPs on the West Hills S.T.E.M Academy expansion project located in Port Orchard WA. As you are aware, P J y are, part of Americast s operating procedure is to review P g p ie all plans of our system to ensure best use and placement for your project. We appreciate your completing the Project Information Worksheet. We duly received the plans 09-05-13 by email and would make the following comments: We find the placement and size appropriate for the following specified Filterra® units as per plans dated:03-2013 F 1: 4'x4' Thanks again for specifying Filterra® for your projects stormwater needs, please feel free to contact me if you should require any additional information or assistance. Dctane Vincent Filterra®Bioretention System Manufactured by Americast 11352 Virginia Precast Road Ashland,VA 23005 Toll Free: (866)349 3458 Phone: (804) 752 1451 Fax: (804) 798 8400 Email: dvincentCcDfilterra.com Web: www.filterra.com. IMPORTANTNOTIC6:This message rincluding any atvchments)may be privileged and/or confidential and irvended sole/v for the use of the indvidual or entity to whom they are addressed. lfyvu have received this e-mail in error please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message or the attichments in whole or in pan is strictly prohibited.Anv views expressed in this e-mail are those ofthe individual sender,except where the sender specifies and with authority,states them to be the views of Americast. From: Dan Laughlin' Sent:Thursday, September 05, 2013 9:58 PM To: Ron Johnson Cc: Filterra Support Subject: RE: West Hills S.T.E.M. Filtera Port Orchard, WA 9/25/2013 Page 2 of 4 Hello Ron, Thank you for providing the plans and updated information for the West Sound S.T.E.M. Filterra Port Orchard, WA Project. 1 have forwarded the information to our engineering support department(support@filterra.com)for review and comment. We look forward to assisting you with the project. Sincerely, Dan Laughlin NW Territory Manager Filterra Bioretention Systems A Division of Americast Direct: (206)406-6361 Email: dlauQhlinafilterra.com Web:www.filterra.com From: Ron Johnson fmailto:rjohnson(dnlolson.coml Sent:Thursday, September 05,2013 5:23 PM To: Dan Laughlin Subject: RE: West Sound S.T.E.M. Filtera Port Orchard, WA Dan: Info on the Filterra used in the design is attached. A 4'x4'seems to work OK. We are still working on the detail sheets. So far we have FTST-3 and FTIRR-3 included from what you sent us. The whm file attached is for WWHM3. Ron From: Dan Laughlin fmailto:dlaughlin@filterra com_l Sent:Thursday,August 22, 2013 6:02 PM To: Ron Johnson Subject: RE: West Sound S.T.E.M. Filtera Port Orchard,WA Hello Ron, It was a pleasure speaking with you on the phone today concerning the West Sound S.T.E.M. Elementary Port Orchard,WA Project. 9/25/2013 Page 3 of 4 Please find attached a copy of our current Western Washington Design Assistance Kit per your request. I have also attached copies of our plant list and current NWR Drawings for review as well. Following up on our conversation, If you can provide us a copy of a preliminary site plan and/or information about the project we will have our engineering support department review the information and provide comment. I have also attached a copy of our project information sheet for your use as well. Thank you again for your interest in Filterra-Kristar Products. We look forward to assisting you with the project. Sincerely, Dan Laughlin NW Territory Manager Filterra Bioretention Systems ADivision ofAmericast Direct: (206)406-6361 Email: dlaughlin filterra.com Web: www.filterra.com �"0,' elAl From: Ron Johnson [mailto:dohnson@nlolson.com] Sent:Thursday,August 22,2013 3:07 PM To: Dan Laughlin Subject: FW: West Sound S.T.E.M. Filtera Oops. With kmz file attached From: Ron Johnson [mailto:riohnson@)nlolson.com] Sent: Thursday,August 22, 2013 3:03 PM To: 'dlaughlin@filterra.com' Subject: West Sound S.T.E.M. Filtera Dan: We are needing enhanced treatment for a new bus lane for the West Sound Elementary S.T.E.M. addition project. Please see attached kmz file for location on google earth. The aea treated is about 4010 square feet, 9/25/2013 Page 4 of 4 and enhanced treatment is required. As discussed, please send the design assistance kit. I will do initial sizing and place the Filterra box, an then send it for verification with your engineers. 10 megs is approximate e-mail size limit. Ron P.S. I just thought I would emphasize the problem in the Quilcene Rain Gauge is only in WWHM2012, which just came out this year and is not used much at all. In our area, only Bremerton has adopted the new 2012 Manual, and we have only used it for one project. We had to switch back and use WWHM3 for design. Ronald P.Johnson,P.E. N.L. Olson&Associates,Inc. 2453 Bethel Avenue Port Orchard, WA 98366 (360) 876-2284 ph. (360) 876-1487 fx. rj ohnson(c)nlolson.com This message contains confidential information. If you are not an intended recipient any dissemination, distribution or copying of this e-mail is prohibited. If you have received this email by mistake please notify the sender immediately and delete this e-mail message from your system. The sender does not accept liability for any errors or omissions in the contents of the email message or attached files which arise as a result of e-mail transmission. Thank you. N.L. Olson&Associates,Inc., www.nlolson.com 9/25/2013 r---- -- -----------�- I I I I I I \ INLET SHAPING A i \ A (BY OTHERS) I - — --1 SDR-35 PVC COUPLING I CAST INTO PRECAST BOX WALL BY AMERICAST (OUTLET PIPE LOCATION VARIES) I I I ' CURB (BY OTHERS) PLAN VIEW -�L TREE FRAME PLANT AS SUPPLIED CLEANOUT COVER & GRATE BY AMERICAST CAST IN TOP SLAB ANGLE NOSING CAST IN (NOT SHOWN GALVANIZED TOP SLAB TOP SLAB FOR CLARITY) CURB AND GUTTER INTERLOCKING co (BY OTHERS) JOINT (TYP) STREET 0 N DOWEL BARS i z ® 12" O.C. UNDERDRAIN STONE PROVIDED BY AMERICAST f PERFORATED MULCH PROVIDED BY AMERICAST UNDERDRAIN SYSTEM BY AMERICAST FILTER MEDIA PROVIDED BY AMERICAST SECTION A-A DESIGNATION L W TREE GRATE OUTLET QTY & SIZE PIPE 4 x 4 4'-0" 4'-0" (1) 3x3 4" SDR-35 PVC 6 x 6 6'-0" 6'-0" (1) 3x3 4" SDR-35 PVC MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT. DATE: 12-09-09 DWG: WWA FfST-3 PRECAST STANDARD�ILTERRA@ UNIT STACONFIGURATION WESTERN WASHINGTON US PAT 6,277,274 (:n,�yright 2(107 by Americast AND 6,569.321 CONNECTION TO SOAKER/SWEAT HOSE OR SPRINKLER HEAD (BY OTHERS) TOP OF CURB 'n TOP SLAB IRRIGATION/SPRINKLER PIPE (BY OTHERS) I i APPROX + 12.5" 2" PVC CONDUIT PRECAST INTO CENTER OF EACH BOX WALL UNIT A B MULCH LAYER SIZE BY AMERICAST 4 x 4 2'-6" 2'-6" 4 x 6 2'-6" 3'-6" ELEVATION VIEW 4 x 8 2'-6" 4'-6- 6 x 6 3'-6" 3'-6" 6 x 8 3'-6" 4'-6- 6 x 10 3'-6" 5'-6" 6 x 12 3'-6" 3'-6" A 6" 8 x 4 4'-6" 2'-6" r——————------ ------------ 36" OR 48" 8 x 6 4'-6" 3'-6" i TREE GRATE 10 x 6 5'-6" 3'-6" 12 x 6 6'-6" 3'-6" 2" PVC \ i CONDUIT PRECAST INTO 1 CENTER OF EACH BOX WALL IRRIGATION/SPRINKLER PIPE (BY OTHERS) i \ CONNECTION TO B SOAKER/SWEAT HOSE OR SPRINKLER HEAD - - -t--------------------------�- (BY OTHERS) - - --- FACE OF FILTERRA THROAT CURB OPENING PLAN VIEW MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED DRAWING AVAILABLE IN TIF FILE FORMAT. BY WRITTEN AUTHORIZATION FROM FILTERRA DATE: 12-09-09 DWG: WWA FTIRR-3 xlFbw89zww8 FILTERRA(g) PLANNING LAYOUT IRRIGATION WESTERN WASHINGTON US PAT 6.277,274 Copyright 1r 2007 by Amer cazt AND 6,569.321 • Corporate Headquarters fi[le rra Filterra Bsoretention Systems 11352 Virginia Precast Rd Ashland,VA 23005 Eroretentor.S;,ferr.s www.filterra.com • design@filterra.com (866)349-3458 Low Impact Development Solutions for Stormwater Runoff Filterra Bioretention Systems is the leading provider of Stormwater biofiltration systems for the treatment of stormwater runoff generated from parking lots,roadways,commercial and residential developments. The Filterra System can be built in a variety of sizes,models and configurations. Filterra's compact size makes it ideal for both urban retrofits and space-constrained new developments. Filterra is easy to install,simple to maintain,and is approved by over 500 local,regional and state agencies. Standard Filterra®System Filterra®Internal Bypass-Curb Y' - �f The standard Filterra System is similar in concept to"raingardens"in its The Filterra Internal Bypass-Curb system incorporates biofiltration and an function and application but has been optimized for high volume/flow internal high flow bypass chamber into one single structure. This systern treatment and high pollutant removal. eliminates the need and cost of installing a separate bypass structure and enables placement on grade or at low points. Filterra®Roofdrain System Filterra•combined with Underground Storage i- - The Filterra Roofdrain System treats"Piped-In" Stormwater runoff from Filterra combined with underground storage provides complete Stormwater rooftops and area drains. Using biofiltration, the system captures and capture,treatment and storage in one packaged system. Surface flows can be immobilizes pollutants of concern such as:TSS,nutrients,oils,greases,metals conveyed into the Filterra and discharged to any underground storage system and bacteria. for detention,retention and re-use applications including landscape irrigation systems.