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RS_Petro_TIR_250501_APPROVED
DECCIO Engineering Inc. 17217 7th Avenue W. Bothell, WA. 98012 (206) 390-8374 Fax: (425) 741-8214 Petrovitsky Apartments City of Renton # TED-40-4279 Drainage Design Report, O&M Manual & SWPP Report Property Location: 11204 SE Petrovisky Road Renton, WA June 15, 2023 Revised: January 20, 2024 Revised: April 6, 2025 Prepared for: Mr. Mackie Corrolla DEVELOPMENT ENGINEERING msippo 07/23/2025 Surface Water Enginering jfarah 07/23/2025 Deccio Engineering Inc Page i TABLE OF CONTENTS SECTION 1 PROJECT OVERVIEW 1 o Figure 1: TIR Worksheet 2 o Figure 2: Site Location Map 7 o Figure 3: Existing Site Characteristic, Drainage Basins, and Sub-Basins 8 SECTION 2 CONDITIONS & REQUIREMENTS SUMMARY 9 ❖ King County Requirements SECTION 3 OFF-SITE ANALYSIS 10 ❖ Sensitive Areas Map 11 ❖ Drainage Complaint Map 12 o Figure 4: Upstream and Downstream Flow Map 14 o Figure 5: Downstream System Table 15 SECTION 4 FLOW CONTROL & WATER QUALITY ANALYSIS AND DESIGN 15 o Figure 6: Soils Logs 16 o Figure 7: Developed Conditions Map 16 o Infiltration Requirements 17 o Soil Management Plan 18 SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 18 SECTION 6 SPECIAL REPORTS AND STUDIES 21 SECTION 7 OTHER PERMITS 21 SECTION 8 SWPPP ANALYSIS AND DESIGN 21 SECTION 9 BONDS, SUMMARIES AND COVENANTS 23 SECTION 10 OPERATIONS AND MAINTENANCE MANUAL 23 ❖ Operations and Maintenance Procedures Appendix A Pipe Conveyance Charts Pump Charts WWHM12 Water Quality Results WWHM12 Vault Results Petrovitsky Apartments TIR Revised: April 6, 2025 1 | P a g e TIR SECTION 1 PROJECT OVERVIEW Project: Petrovitsky Apartments Site Information: The proposed project is the construction of a nine unit apartment building. The site is located at 11204 SE Petrovisky Road. More generally the site is located within SE ¼ of Section 5, Township 23 North, Range 05 East, W.M., (Parcel# 2923059029) see Figure 2: Vicinity Map. The site is bordered by residential and multi-family properties on the north, south, east, and west sides of the site. Pre-developed Site Conditions: The site is 28,900 sf in size, contains an existing home with a trees and landscaping. The lot slopes from south-east to north-west with all runoff draining to the north-west and onto the existing apartment complex to the north. There are no known sensitive areas on-site. Please refer to Figure 3: Existing Conditions Map.. Developed Site Conditions: The project will consist of construction of a nine unit apartment building with parking and landscaping. The site will take access off of Petrovisky Road. Frontage improvements will consist of sidewalks and an 8-foot wide landscape strip. There is no widening required for the pavement, therefore the existing curb and gutter will remain. Flow control will be provided in the form of a closed detention vault. The site will be served by public water and sewer. Please refer to Figure 7: Developed Conditions Map The following is a break down of the site areas: New Impervious Area Summary New Roof Area: 8,310 sf or 0.19 Acres On-Site Conc Walks: 1,415 sf or 0.03 Acres Access Driveway: 8,488 sf or 0.19 Acres R/W Sidewalks: 1,872 sf 0.04 Acres Total: 0.45 Acres Landscaping: 10,900 sf or 0.25 Acres Lot Size: 0.70 Acres The total PGHS area is 0.19 acres requiring enhanced basic water quality in the form of a Filterra filter system. Petrovitsky Apartments TIR Revised: April 6, 2025 2 | P a g e Figure 1: TIR Worksheet Petrovitsky Apartments TIR Revised: April 6, 2025 3 | P a g e Figure 1: TIR Worksheet Petrovitsky Apartments TIR Revised: April 6, 2025 4 | P a g e Figure 1: TIR Worksheet Petrovitsky Apartments TIR Revised: April 6, 2025 5 | P a g e Figure 1: TIR Worksheet filterra Petrovitsky Apartments TIR Revised: April 6, 2025 6 | P a g e Figure 1: TIR Worksheet Petrovitsky Apartments TIR Revised: April 6, 2025 7 | P a g e Figure 2: Site Location Map Petrovitsky Apartments TIR Revised: April 6, 2025 8 | P a g e Figure 3: Drainage Basins, Sub-basins and Site Characteristics Petrovitsky Apartments TIR Revised: April 6, 2025 9 | P a g e TIR SECTION 2 CONDITIONS & REQUIREMENTS SUMMARY The City of Renton has adopted the City of Renton 2022 storm water manual which governs the design of stormwater systems to serve this project. The Core and Special Requirements are being met in the following manner: City of Renton 2022 Storm Water Manual Core Requirements: 1. Discharge at the Natural Location The surveyed contours indicate runoff leaves the site towards the northwest property line onto the adjacent northern property. The project will maintain this drainage flow by discharging into a catch basin on Petrovitsky Road. The system in Petrovitsky ultimately discharges in the adjacent parcel. This is where drainage naturally discharges. 2. Off-site Analysis The Level 1 downstream analysis showed that there will be minimal impacts on the downstream conditions, since the site proposes to use detention to address all stormwater runoff. 3. Flow Control The site will meet the flow control standards using on-site detention in the form of a detention vault. The point of compliance for this site is at the connection between the on- site system and the public system in the right-of-way. As shown in current design, the outlet structure of the vault is being treated as the point of compliance 4. Conveyance System The conveyance system consist of 12” storm pipes and catch basins draining to the detention vault with a pump system pumping up and discharging the stormwater to an existing catch basin in SE Petrovitsky Road. 5. Temporary Erosion & Sediment Control All TESC measures proposed will conform to the 2022 Renton Stormwater Manual during construction. Refer to Section 9 of this TIR for additional information. The measures shown on the TESC plans include: Clearing limits, sediment control, soil stabilization, BMP’s maintenance and construction sequence 6. Maintenance & Operations Maintenance and Operations manual has been provided at the back of this report. Note that a “Declaration of Covenant” may be required. See Section 10. 7. Financial Guarantees & Liability A completed bond quantity worksheet maybe required 8. Water Quality The total PGHS area is 0.19 acres and therefore, water quality in the form a Contech Filterra system is proposed to meet the enhanced basic treatment requirement. Refer to Section 4 of this report. Petrovitsky Apartments TIR Revised: April 6, 2025 10 | P a g e 9. Flow Control BMP’s The site was reviewed for on-site BMP’s and it was determined that only detention is applicable for the site improvements. Therefore, LID Performance standards will be utilized. Landscaping: BMP T5.13 “Post Construction Soil Quality and Depth” The top soils will be stockpile on-site and reused per “Implementation Options #3 per Volume V, Chapter 5, BMP T5.13 “Post Construction Soil Quality and Depth” which requires “Stockpile existing top soils during grading and replace it prior to planting…” In addition, the soils will be required to be tested for organic compliance. (See work sheets on following pages). City of Renton 2022 storm water manual Special Requirements: 1. Other Adopted Area-Specific Requirements There are no area-specific requirements for this project site. 2. Floodplain/Floodway Delineation A review of the FEMA FIRM panels for the site, shows that the site and area of work is outside any floodplain areas and site does not contain any floodplain delineations. 3. Flood Protection Facilities There are no flood protection facilities located on or directly adjacent to the site. 4. Source Control The final site does not meet the threshold for source control requirements. 5. Oil Control The final site does not meet the threshold for oil control requirements. 6. Aquifer Protection Area None known. LARGE LOT BMP REQUIREMENTS IF the proposed project is on a site/lot that is 22,000 square feet or larger, THEN on-site BMPs must be applied as specified in the requirements below OR the project must demonstrate compliance with the LID Performance Standard (described in Section 1.2.9.1.B) using an approved continuous runoff model. The project will use the LID performance standards as follows: B. LOW IMPACT DEVELOPMENT PERFORMANCE STANDARD The LID Performance Standard is defined as follows: For the target surfaces subject to Core Requirement #9, Stormwater discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow. Assume historical site conditions as the predeveloped condition. Petrovitsky Apartments TIR Revised: April 6, 2025 11 | P a g e Projects that opt to demonstrate compliance with the LID Performance Standard using a continuous runoff model must protect the soil moisture capacity of new pervious in accordance with the soil amendment BMP as detailed in Appendix C, Section C.2.13. Additionally, any proposed connection of roof downspouts to the local drainage system must be via a perforated pipe connection as detailed in Appendix C, Section C.2.11. Petrovitsky Apartments TIR Revised: April 6, 2025 12 | P a g e Projects that are required or opt to model compliance with the LID Performance Standard are still subject to meeting applicable area specific flow control requirements as determined in Core Requirement #3 (Section 1.2.3). Note that when demonstrating compliance with the LID Performance Standard, on-site BMPs are modeled explicitly, utilizing design infiltration rates as determined and selected per Section 5.2.1. However, when modeling flow control facility sizing, water quality facility sizing, and the peak flow exceptions from the area-specific flow control facility requirement in Sections 1.2.3.1.A, B, and C, these BMPs are not modeled explicitly, but may use modeling credits as allowed and subject to the limitations described in Section 1.2.9.4 and Table 1.2.9.A. On-site BMPs used to demonstrate compliance with the LID Performance Standard must meet the implementation requirements described in Section 1.2.9.4. C. DEMONSTRATING COMPLIANCE WITH THE LID PERFORMANCE STANDARD Project applicants may opt to use the LID Performance Standard in lieu of the BMP selection City of Renton Conditions FINDINGS/CONCLUSIONS: To be determined Petrovitsky Apartments TIR Revised: April 6, 2025 13 | P a g e TIR SECTION 3 OFF-SITE ANALYSIS TASK 1 – STUDY AREA DEFINITIONS AND MAPS Overview This section of the TIR is a Level 1 Downstream Analysis per the City of Renton 2022 storm water manual Section 2.3. The site is 0.70 acres in size and contains an existing cover of trees and landscaping . The lot slopes from south-east to north-west with all runoff draining onto the adjacent property to the north. Upstream Drainage Analysis / Upstream Contributing Area Based on the site contours, all upstream off-site runoff is intercepted by the Petrovisky Road. Therefore, there is little if any off-site runoff draining onto the site. TASK 2 – RESOURCE REVIEW Adopted Basin Plan The site is located in the Soos Creek Drainage Basin which is with in the Duwamish-Green River Basin Community Plan The site is located in the Duwamish-Green River Basin Planning Area. Basin Reconnaissance Summary Report We are not aware of a current Basin Reconnaissance Summary Report for this area. Critical Drainage Area The site is not considered to be within a critical drainage area as defined by the City of Renton 2022 storm water manual A review of the DOE “water quality assessment” web site shows that the section of the site discharges into is not on the DOE 303(d) list. Sensitive Area Maps Per City of Renton the site does not contain any sensitive areas.. Soils Survey The Geotech report prepared for the site, shows the soils to be a silty-sand and not suitable for infiltration Wetland / Stream Inventory There are no wetlands or stream noted A review of the FEMA FIRM panels for the site, shows that the site is outside any floodplain areas and site does not contain any floodplain/floodway delineations. Petrovitsky Apartments TIR Revised: April 6, 2025 14 | P a g e Drainage Complaints There appeared to be only three drainage complaints downstream of the site, and all were closed in 2004. (See “Drainage Complaints Map”) TASK 3 – FIELD INSPECTION A Level 1 site inspection was performed on September 12, 2022. The weather was clear. The inspection focused on identifying potential downstream drainage and water quality problems As previously indicated, the site slopes from south-east to north-west with all runoff leaving the site and discharging onto the adjacent property to the north TASK 4 – DRAINAGE SYSTEM DESCRIPTION, AND PREDICTED DRAINAGE AND WATER QUALITY PROBLEMS SE PETROVITSKY R/W DRAINAGE. 1. The runoff from the 2,700 sf of right-of-way improvements drains south into the street and flows west away from the site. NOTE: the right of way drainage combines with the site drainage within ¼ mile downstream. OFFSITE LEVEL ONE DOWNSTREAM ANALYSIS 1. The runoff leaves the site and flows into the storm system serving the apartment complex to the north where it flows north for 700-ft before discharging into a forested area. 2. The drainage then flows overland where it drains into Big Soos Creek. The stream then flows east for of 2,500 feet passing under 116th Ave SE and under 117th Ave SE and 119th Ave SE before crossing Petrovisky Road where it continues flowing east for another 2,500 feet. The total distance covered is just under 1-mile Note: There were no indications of issues noted. Where visible the stream channel appeared to be in good condition and well vegetated. However, most of the downstream was on private property and not accessible to inspection. Basin 1 Predicted Drainage and Water Quality Problems There appeared to be no issues downstream and since detention is provided for all the site improvements, the proposed project should have little if any impact on downstream conditions. TASK 5 MITIGATION OF EXISTING OR POTENTIAL PROBLEMS The project proposes to provided detention and water quality to address the storm water runoff from the proposed site improvements, thus mitigating any downstream impacts. Petrovitsky Apartments TIR Revised: April 6, 2025 15 | P a g e Figure 5: Upstream Area and Downstream Flow Map Petrovitsky Apartments TIR Revised: April 6, 2025 16 | P a g e Figure 6: Downstream System Table Petrovitsky Apartments TIR Revised: April 6, 2025 17 | P a g e Drainage Complaints 1-Complaint number 2004-0933 Complaint type WQA Date received Problem WQAI Date closed 6/16/2008 2-Complaint number 2003-0783 Complaint type WQA Date received Problem WQAI Date closed 3/20/2008 3-Complaint number 2004-0678 Complaint type WQA Date received Problem WQAI Date closed 3/24/2008 Petrovitsky Apartments TIR Revised: April 6, 2025 18 | P a g e TIR SECTION 4 FLOW CONTROL & WATER QUALITY ANALYSIS AND DESIGN The project proposes to provide detention to meet the requirements of the 2022 City of Renton Surface Water Design Manual and the LID Performance Standard requirements. For the target surfaces subject to Core Requirement #9, Stormwater discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow. Projects that opt to demonstrate compliance with the LID Performance Standard using a continuous runoff model must protect the soil moisture capacity of new pervious in accordance with the soil amendment BMP. Additionally, any proposed connection of roof downspouts to the local drainage system must be via a perforated pipe connection. Projects that are required or opt to model compliance with the LID Performance Standard are still subject to meeting applicable area specific flow control requirements as determined in Core Requirement #3. The WWHM Ver.12 Hydraulic Simulation Model was used to calculate the pre-developed and developed flows for the Hydrographs for the 2-year and 50-year, 24-hour duration design storm events for the existing and developed conditions. Pump System: In lieu of using the standard control structure design, the vault was sized using SSD (stage-storage-discharge) input tables to size the pumps to release 50-percent of the 2-year peak flow through the 50-year flow in order to provide the required detention for the developed site runoff. The hydrographs were generated using the following information: The SSD Table and the following details were used to size the vault: WWHM12 Input Information • Regional Gage Station: SeaTac • Precip Scale: 1.00 • Soils Type: Till Existing Site Hydrology The existing site is 0.70 acres in size The WWHM12 runoff was calculated using existing forested conditions to determine the total allowable release rate from the Existing Site. (See Figure 3: “Existing Site Conditions”). The site soils are identified as Till Type C,. Existing Area: 1. Onsite Area 0.70 acres (forested) Total Area: 0.70 Acres Petrovitsky Apartments TIR Revised: April 6, 2025 19 | P a g e Figure 3: Existing Site Conditions Petrovitsky Apartments TIR Revised: April 6, 2025 20 | P a g e Developed Site Hydrology The runoff from the developed site conditions including roof areas, driveways, and landscaping, will be collected and conveyed in catch basins and pipes to the storm water detention vault located in the parking lot. Discharge from the site will be pumped up and into the existing storm pipe system running out in the street . (See Figure 6: “Developed Site Conditions”) The total area to be detained 0.70 acres. Impervious Areas: Developed Sub-Basin ▪ New Roofs: 0.19 acres ▪ R/W S-walks 0.04 acres ▪ Walks 0.03 acres ▪ Road pavement and Driveways 0.19 acres Total Impervious Area: 0.45 acres (Impervious) Pervious Area: ▪ Lawn Area/Landscape: Pervious 0.25 acres Total Pervious Area: 0.25 acres (Lawn/Landscape) Total Area: 0.70 acres SSD Table Input • Vault Area: 1,568 sf (98’ x 16’) • Vault Depth: 7-ft • Allowable Release Rate: 0.015 cfs Results of WWHM12 Computer Analysis: Storm Event Mitigated. Site Predev. Site • 2-year, return period: 0.019107 cfs 0.031324 cfs • 50-year, return period: 0.071640 cfs 0.086837 cfs • 100-year, return period: 0.089128 cfs 0.096631 cfs The runoff from the site improvements will be detained and released at the required pre- developed rates. See Appendix A for WWHM12 calculation results. Maintenance Access: The paved access drive to the vault will provide the required maintenance access to the control structure. Detention Calculation Results: A summary of the detention calculations and vault design are shown on the following pages. The concrete vault will provide the required flow control for the site improvements. • Soil Amendment BMP’s: Will be used on site Petrovitsky Apartments TIR Revised: April 6, 2025 21 | P a g e Figure 7: Developed Site Conditions Petrovitsky Apartments TIR Revised: April 6, 2025 22 | P a g e FLOW CONTROL SYSTEM Results From WWHM12 Calculations: Retention/Detention Facility ➢ Type Of Facility: Detention Vault ➢ Side Slopes: Vert Conc Walls ➢ Pond Bottom Width: 16.0 ➢ Pond Bottom Length: 98.0 ➢ Pond Bottom Area: 1,568 sf ➢ Effective Live Storage Depth: 7.0 ft ➢ Live Storage Volume Required: 10.976 cu.-ft ➢ Live Storage Volume Provided: 10,976 cu.-ft (at Vault Size Designed) ➢ Dead Storage Volume Req’d: 784 cu.-ft (at 0.5-ft depth) ➢ Dead Storage Volume Provided: 784 cu.-ft (at 0.5 ft depth) ➢ Water Quality System: Filterra ➢ Riser Head: 7.0 ft ➢ Riser Diameter: 12.00 inches ➢ Number of Orifices: 3 Orifices # Height Diameter 1 0.00 ft 0.52 inches (1/2inch) 2 4.23 ft 0.86 inches (7/8-inch) 3 5.30 ft 0.54 inches (9/16- inch) Over Flow 12" Dia. 7.00 ft 12.00 inches The results of the WWHM12 calculations are included in Appendix A PUMP DESIGN: Per Table 1.2.3.A of Core Requirement #3, under Forested Conditions the discharge must match the peaks for the 50% of the 2-year and 10-year return periods. Per the WWHM12 results: • 50% of 2-Year Predeveloped Flow: 0.0313 cfs/2 = 0.015 cfs or 5.5 gpm • 10-Year Predeveloped Flow: 0.0620 cfs or 22.0 gpm The two-pump system alternates, with each pump delivering 5.0 gpm. The duplex pump system matches the 50% 2-year flow rate. A backup emergency generator is required for the pump system along with the remote panel and alarm. See O&M Section for Pump Maintenance and Pump Emergency Response Plans See Appendix A for WWHM12 calculation results and pump table Petrovitsky Apartments TIR Revised: April 6, 2025 23 | P a g e SECTION 5: CONVEYANCE SYSTEM ANALYSIS AND DESIGN The piping and conveyance system for the interception of the drainage from the site was designed to convey the runoff from the 100-year, 24-hour storm event. (See Flow Charts Appendix A) The following conveyance capacity calculations for the on-site systems were calculated using the 100-year developed flow results from Parking and Driveway’s and the SBUH Method for the storm calculations. Design results: Storm Event Dev. On Site • 100-year, return period: 0.80 cfs: Dev flows for 12-inch pipe from the site improvements PIPE CAPACITY: DRIVEWAY TO VAULT The 12- HDPE pipe from the Driveway to vault was sized to handle the runoff from the 100-year storm. (See Appendix A “Pipe Conveyance Charts” Using D.O.T. Chart 35 "Design Charts For Open Channel Flow": 12" HDPE Pipe Slope: 0.50 % Minimum Slope, Mannings: n = .012 100-Year Dev. Flows: 0.80 cfs Design Flow Capacity Results: 12" Pipe Capacity: = 1.85 cfs (flowing full) > 0.80 cfs required Velocity: = 3.95 fps > 3.00 fps required Therefore the 12" HDPE is adequate. 12-INCH POND STANDPIPE OVERFLOW: The 12- Stand pipe used as a the vertical over flow for the vault was sized to handle the runoff from the 100-year developed storm. (See Appendix A “Figure III-2.38 “Riser Inflows Curves”) Concrete Vault: Peak Stage above overflow: 0.5 feet from overflow to top of vault lid Capacity Required: 1.10 cfs Capacity Provided: 4.80 cfs Therefore, overflow ok. Petrovitsky Apartments TIR Revised: April 6, 2025 24 | P a g e WATER QUALITY: Parking & Driveway Water Quality: Water quality will be provided by installing a 4’ x 8’ “Filterra Peak Diversion” (FTPD) filter structure from Contech StormWater Management Inc. The filterra system meets the DOE requirements for metals, phosphorus and oil treatment. • The sizing calculations are based on the WWHM12 results for 15-minute online adjusted flow rate of 0.0455 cfs as shown on the following pages Petrovitsky Apartments TIR Revised: April 6, 2025 25 | P a g e Petrovitsky Apartments TIR Revised: April 6, 2025 26 | P a g e Petrovitsky Apartments TIR Revised: April 6, 2025 27 | P a g e Soil Management Plan for “Post Construction Soil Standard” The top soils will be stockpile on-site and reused per “Implementation Options #4b “Amend existing soil in place per the Post Construction Soil Standard” which requires “Stockpile existing top soils during grading and replace it prior to planting…” In addition, the soils will be required to be tested for organic compliance. See the following requirements. Petrovitsky Apartments TIR Revised: April 6, 2025 28 | P a g e TIR SECTION 6 SPECIAL REPORTS AND STUDIES • Structural Vault calculations, TIR SECTION 7 OTHER PERMITS Below is the list of anticipated permits required for this project. Other permits may be required that are not mentioned below. • Building Permit – New apartment building • Structural Vault Permit TIR SECTION 8 CSWPPP ANALYSIS AND DESIGN For the purposes of this report, several standard erosion control procedures will be utilized by the contractor to minimize the amount of erosion and sedimentation perpetuated by the construction of the site. Furthermore, these techniques are proposed for the Construction Stormwater Pollution Prevention Plan (CSWPPP) and should be reviewed and instituted by the onsite contractor. Some of the measures include filter fabric fence, and standard ground cover practices. A construction sequence will also be used to minimize the impacts of erosion due to construction. ESC Plan Analysis and Design (Part A) 1. At 0.70 acres in size, the site is small requiring only minimal ESC measures. The 13- Elements of a Construction CSWPPP listed below, discuss and describe the appropriate ESC measure to be used. 2. Due to the small size of the site, no ESC facilities are proposed. Therefore, no analysis of the site’s ESC facilities was required. The proposed BMPs consist of standard items including: filter fences, construction entrance, CB inlet protection and plastic cover, etc. No sediment traps are proposed. If required, the vault can be used as a temporary sediment pond. 3. The area of the development with any high erosion are minimal and will be controlled by the filter fence around the perimeter of the site. 4. There were no special reports done for the site. 5. No exceptions or modifications are proposed of the “Erosion and Sedimentation Control Standards” Petrovitsky Apartments TIR Revised: April 6, 2025 29 | P a g e THE 13 ELEMENTS OF A CONSTRUCTION CSWPPP 1. Clearing Limits: Prior to any site clearing or grading, areas to remain undisturbed during project construction shall be delineated on the project’s ESC plan and physically marked on the project site. BMP plastic or Metal Fencing 2. Cover Measures: Temporary and permanent cover measures shall be provided when necessary to protect disturbed areas. The intent of these measures is to prevent erosion by having as much area as possible covered during any period of precipitation. BMP: 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 consecutive working days during the wet season (October 1 to April 30). These time limits may be relaxed if an area poses a low risk of erosion due to soil type, slope gradient, anticipated weather conditions, or other factors. BMP: Mulching D.2.1.2.2 BMP: Plastic Covering D.2.1.2.4 3. Perimeter Protection: Perimeter protection to filter sediment from sheet flow shall be provided downstream of all disturbed areas prior to upslope grading. BMP: Silt Fence D.2.1.3.1 4. Traffic Area Stabilization: Unsurfaced entrances, roads, and parking areas used by construction traffic shall be stabilized to minimize erosion and tracking of sediment offsite. BMP: Stabilized Construction Entrance D.2.1.4.1 5. Sediment Retention: Surface water collected from all disturbed areas of the site shall be routed through a sediment pond or trap prior to release from the site, except those areas at the perimeter of the site small enough to be treated solely with perimeter protection. Sediment retention facilities shall be installed prior to grading any contributing area. BMP: Catch Basin Insert D.2.1.5.F BMP: D..2.1.5.2 Vault to be use as temporary sediment storage and to be pump and disposed of at a proper facility 6. Surface Water Collection: Surface water collection measures (e.g., ditches, berms, etc.) shall be installed to intercept all surface water from disturbed areas, convey it to a sediment pond or trap, and discharge it downstream of any disturbed areas. Areas at the perimeter of the site, which are small enough to be treated solely with perimeter protection, do not require surface water collection. Significant sources of upstream surface water that drain onto disturbed areas shall be intercepted and conveyed to a stabilized discharge point downstream of the disturbed areas. Surface water collection measures shall be installed concurrently with or immediately following rough grading and shall be designed, constructed, and stabilized as needed to minimize erosion. BMP: Pipe Slope Drains D.2.1.6.2 Direct surface water run off to vault. 7. Dewatering Control: The water resulting from construction site de-watering activities must be treated prior to discharge or disposed of as specified. BMP: No groundwater anticipated 8. Dust Control: Preventative measures to minimize wind transport of soil shall be implemented when a traffic hazard may be created or when sediment transported by wind is likely to be deposited in water resources. BMP: When using water for dust control, the exposed soils shall be sprayed until wet, but runoff shall not be generated by spraying. 9. Flow Control: Surface water from disturbed areas must be routed through the project’s onsite flow control facility or other provisions must be made to prevent increases in the existing site conditions 2-year and 10-year runoff peaks discharging from the project site during construction (flow control facility, runoff treatment facility, and on-site BMP areas [existing or proposed] shall not be used for this purpose). Petrovitsky Apartments TIR Revised: April 6, 2025 30 | P a g e BMP: None required due to the small size of the project 10. Control Pollutants: Stormwater pollution prevention (SWPPS) measures are required to prevent, reduce, or eliminate the discharge of pollutants to onsite or adjacent stormwater systems or watercourses from construction-related activities such as materials delivery and storage, onsite equipment fueling and maintenance, demolition of existing buildings and disposition of demolition materials and other waste, and concrete handling, washout and disposal. Section D.2.2 describes BMPs specific to this purpose; additionally, several of the ESC BMPs described herein are applicable. BMP: Concrete Handling (see notes below 11. Protect Existing and Proposed Stormwater Facilities and On-site BMPs: Sedimentation and soil compaction reduce the infiltration capacity of native and engineered soils. Protection measures shall be applied/installed and maintained so as to prevent adverse impacts to existing stormwater facilities and on-site BMPs and areas of proposed stormwater facilities and on-site BMPs for the project. Adverse impacts can prompt the requirement to restore or replace affected stormwater facilities and on-site BMPs. BMP: Protect all stormwater facilities and on-site BMPs and proposed stormwater facility and on-site BMP footprints from sedimentation through installation and maintenance of erosion and sediment control BMPs on portions of the site that drain into the BMPs/facilities. BMP: Stormwater facilities and on-site BMPs shall be restored to their fully functioning condition if they accumulate sediment during construction. Restoring the stormwater facilities and on-site BMPs shall include, at a minimum, removal of sediment and any sediment-laden bioretention soils, and replacing the removed soils with soils meeting the design specification. Replacement with a new fully-functioning stormwater facility and/or on-site BMP may be required if restoration to the fully-functioning condition can’t be accomplished. 12. Maintain Protective BMPs: Protection measures shall be maintained to ensure continued performance of their intended function, to prevent adverse impacts to existing BMPs/facilities and areas of proposed BMPs/facilities, and protect other disturbed areas of the project. 13. Manage the Project: Coordination and timing of site development activities relative to ESC concerns, and timely inspection, maintenance and update of protective measures are necessary to effectively manage the project and ensure the success of protective ESC and SWPPS design and implementation. Since the project is for residential apartments, under the City of Renton 30.63 A.530, (2) the project does not fall under the “High Use Sites” covering commercial or industrial sites. BMP Concrete Handling (Design and Installation Specifications) Concrete truck chutes, pumps, and internals shall be washed out only into formed areas awaiting installation of concrete or asphalt. Unused concrete remaining in the truck and pump shall be returned to the originating batch plant for recycling. Hand tools including, but not limited to, screeds, shovels, rakes, floats, and trowels shall be washed off only into formed areas awaiting installation of concrete or asphalt. Equipment that cannot be easily moved, such as concrete pavers, shall only be washed in areas that do not directly drain to natural or constructed stormwater conveyances. Washdown from areas such as concrete aggregate driveways shall not drain directly to natural or constructed stormwater conveyances. When no formed areas are available, washwater and leftover product shall be contained in a lined container. Contained concrete shall be disposed of in a manner that does not violate groundwater or surface water quality standards Petrovitsky Apartments TIR Revised: April 6, 2025 31 | P a g e Maintenance Standards: Containers shall be checked for holes in the liner daily during concrete pours and repaired the same day Soil Management Plan for “Post Construction Soil Standard” The top soils will be stockpile on-site and reused per “Implementation Options #4b “Amend existing soil in place per the Post Construction Soil Standard” which requires “Stockpile existing top soils during grading and replace it prior to planting…” In addition, the soils will be required to be tested for organic compliance. See the following requirements. Amend Existing Soils, Purpose and Definition Naturally occurring (undisturbed) soil and vegetation provide important stormwater functions including: water infiltration; nutrient, sediment, and pollutant adsorption; sediment and pollutant biofiltration; water interflow storage and transmission; and pollutant decomposition. These functions are largely lost when development strips away native soil and vegetation and replaces it with minimal topsoil and sod. Not only are these important stormwater functions lost, but such landscapes themselves become pollution- generating pervious surfaces due to increased use of pesticides, fertilizers and other landscaping and household/industrial chemicals, the concentration of pet wastes, and pollutants that accompany roadside litter. Establishing soil quality and depth regains greater stormwater functions in the post development landscape, provides increased treatment of pollutants and sediments that result from development and habitation, and minimizes the need for some landscaping chemicals, thus reducing pollution through prevention. Applications and Limitations Establishing a minimum soil quality and depth is not the same as preservation of naturally occurring soil and vegetation. However, establishing a minimum soil quality and depth will provide improved on-site management of stormwater flow and water quality. Soil organic matter can be attained through numerous materials such as compost, composted woody material, biosolids, and forest product residuals. It is important that the materials used to meet the soil quality and depth BMP be appropriate and beneficial to the plant cover to be established. Likewise, it is important that imported topsoils improve soil conditions and do not have an excessive percent of clay fines. Design Guidelines Soil retention. The duff layer and native topsoil should be retained in an undisturbed state to the maximum extent practicable. In any areas requiring grading remove and stockpile the duff layer and topsoil on site in a designated, controlled area, not adjacent to public resources and critical areas, to be reapplied to other portions of the site where feasible. Soil quality. All areas subject to clearing and grading that have not been covered by impervious surface, incorporated into a drainage facility or engineered as structural fill or slope shall, at project completion, demonstrate the following: I. A topsoil layer with a minimum organic matter content of ten percent dry weight in planting beds, and 5% organic matter content (based on a loss-on-ignition test) in turf areas, and a pH from 6.0 to 8.0 or matching the pH of the original undisturbed soil. The topsoil layer shall have a minimum depth of eight inches except where tree roots limit the depth of incorporation of amendments needed to meet the criteria. Subsoils below the topsoil layer should be scarified at least 4 inches with some incorporation of the upper material to avoid stratified layers, where feasible. 2. Planting beds must be mulched with 2 inches of organic material Petrovitsky Apartments TIR Revised: April 6, 2025 32 | P a g e 3. Quality of compost and other materials used to meet the organic content requirements: a. The organic content for -pre-approved” amendment rates can be met only using compost that meets the definition of -composted materials” in WAC I73-350-220. This code is available online at: http://www.ecy.wa.gov/programs/swfa/facilities/350.html. Compost used in bioretention areas should be stable, mature and derived from yard debris, wood waste, or other organic materials that meet the intent of the organic soil amendment specification. Biosolids and manure composts can be higher in bio-available phosphorus than compost derived from yard or plant waste and therefore are not allowed in bioretention areas due to the possibility of exporting bio-available phosphorus in effluent. The compost must also have an organic matter content of 35% to 65%, and a carbon to nitrogen ratio below 25:I. The carbon to nitrogen ratio may be as high as 35:I for plantings composed entirely of plants native to the Puget Sound Lowlands region. b. Calculated amendment rates may be met through use of composted materials as defined above; or other organic materials amended to meet the carbon to nitrogen ratio requirements, and meeting the contaminant standards of Grade A Compost. The resulting soil should be conducive to the type of vegetation to be established. Implementation Options: The soil quality design guidelines listed above can be met by using one of the methods listed below. I. Leave undisturbed native vegetation and soil, and protect from compaction during construction. 2. Amend disturbed soil according to the following procedures: b. Scarify subsoil to a depth of one foot c. In planting beds, place three inches of compost and till in to an eight-inch depth. d. In turf areas, place two inches of compost and till in to an eight-inch depth. e. Apply two to four inches of arborist wood chip, coarse bark mulch, or compost mulch to planting beds after final planting. Alternatively, disturbed soil can be amended on a site-customized manner so that it meets the soil quality criteria set forth above, as determined by a licensed engineer, geologist, landscape architect, or other person as approved by City of Renton. 3. Stockpile existing topsoil during grading, and replace it prior to planting. Stockpiled topsoil must be amended if needed to meet the organic matter and depth requirements by following the procedures in method (2) above). 4. Import topsoil mix of sufficient organic content and depth to meet the organic matter and depth requirements. 5. More than one method may be used on different portions of the same site. Soil that already meets the depth and organic matter quality standards, and is not compacted, does not need to be amended. Maintenance Soil quality and depth should be established toward the end of construction and once established, should be protected from compaction, such as from large machinery use, and from erosion. Soil should be planted and mulched after installation. Plant debris or its equivalent should be left on the soil surface to replenish organic matter. Petrovitsky Apartments TIR Revised: April 6, 2025 33 | P a g e TIR SECTION 9 BONDS, SUMMARIES AND COVENANTS All the necessary documents listed below will be included after first review comments are received. These will include: • Bond Quantities, • Flow Control and Water Quality Facility Summary Sheet and Sketch • Declaration of Covenant for Privately Maintained Flow Control and WQ Facilities • Declaration of Covenant for Privately Maintained Flow Control BMPs TIR SECTION 10 OPERATIONS AND MAINTENANCE MANUAL Stormwater System Description The stormwater system for the site is fairly basic and contains the following elements: • 12”-inch storm pipe • Catch basin • Detention Vault • Filterra • Pump System PUMP SYSTEM MAINTENANCE PROCEDURES 1. There will be two backup pumps on site, in addition to the two active pumps. 2. During rainstorms, check the pump system for proper operation. 3. The name and phone number of the pump installer should be displayed on the high water alarm box and contacted in case of pump or system failure. 4. Maintain and service the emergency backup generator according to the manufacturer's recommendations. 5. Check the backup emergency generator monthly for proper operation. EMERGANCY RESPONSE PLAN 1) In a power outage, the on-site backup generator should automatically start to restore power. 2) In the event of a pump or system failure, contact the pump installer using the name and phone number provided on the high water alarm box. Filterra Owner’s Manual ® Bioretention Systems ENGINEERED SOLUTIONS www.ContechES.com/filterra | 800-338-1122 3 Table of Contents Introduction ................................................................................4 Activation Overview .....................................................................4 Filterra Plant Selection Overview ...................................................6 Warranty Overview ......................................................................6 Routine Maintenance Guidelines...................................................6 Maintenance Visit Procedure .........................................................9 Appendix 1 – Activation Checklist ...............................................12 Appendix 2 – Planting Requirements for Filterra Systems ................13 Enclosed Local Area Filterra Plant List ® Bioretention Systems ENGINEERED SOLUTIONS www.ContechES.com/filterra | 800-338-11224 Introduction Thank you for your purchase of the Filterra® Bioretention System. Filterra is a specially engineered stormwater treatment system incorporating high performance biofiltration media to remove pollutants from stormwater runoff. The system’s biota (vegetation and soil microorganisms) then further breakdown and absorb captured pollutants. All components of the system work together to provide a sustainable long-term solution for treating stormwater runoff. The Filterra system has been delivered to you with protection in place to resist intrusion of construction related sediment which can contaminate the biofiltration media and result in inadequate system performance. These protection devices are intended as a best practice and cannot fully prevent contamination. It is the purchaser’s responsibility to provide adequate measures to prevent construction related runoff from entering the Filterra system. Included with your purchase is Activation of the Filterra system by the manufacturer as well as a 1-year warranty from delivery of the system and 1-year of routine maintenance (mulch replacement, debris removal, and pruning of vegetation) up to twice during the first year after activation. Design and Installation Each project presents different scopes for the use of Filterra systems. Information and help may be provided to the design engineer during the planning process. Correct Filterra box sizing (by rainfall region) is essential to predict pollutant removal rates for a given area. The engineer shall submit calculations for approval by the local jurisdiction. The contractor is responsible for the correct installation of Filterra units as shown in approved plans. A comprehensive installation manual is available at www.ContechES.com. Activation Overview Activation of the Filterra system is a procedure completed by the manufacturer to place the system into working condition. This involves the following items: • Removal of construction runoff protection devices • Planting of the system’s vegetation • Placement of pretreatment mulch layer using mulch certified for use in Filterra systems. Activation MUST be provided by the manufacturer to ensure proper site conditions are met for Activation, proper installation of the vegetation, and use of pretreatment mulch certified for use in Filterra systems. www.ContechES.com/filterra | 800-338-1122 5 Minimum Requirements The minimum requirements for Filterra Activation are as follows: 1. The site landscaping must be fully stabilized, i.e. full landscaping installed and some grass cover (not just straw and seed) is required to reduce sediment transport. Construction debris and materials should be removed from surrounding area. 2. Final paving must be completed. Final paving ensures that paving materials will not enter and contaminate the Filterra system during the paving process, and that the plant will receive runoff from the drainage area, assisting with plant survival for the Filterra system. 3. Filterra throat opening should be at least 4” in order to ensure adequate capacity for inflow and debris. An Activation Checklist is included on page 12 to ensure proper conditions are met for Contech to perform the Activation services. A charge of $500.00 will be invoiced for each Activation visit requested by Customer where Contech determines that the site does not meet the conditions required for Activation. www.ContechES.com/filterra | 800-338-11226 Filterra Plant Selection Overview A Plant List has been enclosed with this packet highlighting recommended plants for Filterra systems in your area. Keep in mind that plants are subject to availability due to seasonality and required minimum size for the Filterra system. Plants installed in the Filterra system are container plants (max 15 gallon) from nursery stock and will be immature in height and spread at Activation. It is the responsibility of the owner to provide adequate irrigation when necessary to the plant of the Filterra system. The “Planting Requirements for Filterra Systems” document is included as an appendix and discusses proper selection and care of the plants within Filterra systems. Warranty Overview Refer to the Contech Engineered Solutions LLC Stormwater Treatment System LIMITED WARRANTY for further information. The following conditions may void the Filterra system’s warranty and waive the manufacturer provided Activation and Maintenance services: • Unauthorized activation or performance of any of the items listed in the activation overview • Any tampering, modifications or damage to the Filterra system or runoff protection devices • Removal of any Filterra system components • Failure to prevent construction related runoff from entering the Filterra system • Failure to properly store and protect any Filterra components (including media and underdrain stone) that may be shipped separately from the vault Routine Maintenance Guidelines With proper routine maintenance, the biofiltration media within the Filterra system should last as long as traditional bioretention media. Routine maintenance is included by the manufacturer on all Filterra systems for the first year after activation. This includes a maximum of 2 visits to remove debris, replace pretreatment mulch, and prune the vegetation. More information is provided in the Operations and Maintenance Guidelines. Some Filterra systems also contain pretreatment or outlet bays. Depending on site pollutant loading, these bays may require periodic removal of debris, however this is not included in the first year of maintenance, and would likely not be required within the first year of operation. These services, as well as routine maintenance outside of the included first year, can be provided by certified maintenance providers listed on the Contech website. Training can also be provided to other stormwater maintenance or landscape providers. www.ContechES.com/filterra | 800-338-1122 7 Why Maintain? All stormwater treatment systems require maintenance for effective operation. This necessity is often incorporated in your property’s permitting process as a legally binding BMP maintenance agreement. Other reasons to maintain are: • Avoiding legal challenges from your jurisdiction’s maintenance enforcement program. • Prolonging the expected lifespan of your Filterra media. • Avoiding more costly media replacement. • Helping reduce pollutant loads leaving your property. Simple maintenance of the Filterra is required to continue effective pollutant removal from stormwater runoff before discharge into downstream waters. This procedure will also extend the longevity of the living biofilter system. The unit will recycle and accumulate pollutants within the biomass, but is also subjected to other materials entering the inlet. This may include trash, silt and leaves etc. which will be contained above the mulch layer. Too much silt may inhibit the Filterra’s flow rate, which is the reason for site stabilization before activation. Regular replacement of the mulch stops accumulation of such sediment. When to Maintain? Contech includes a 1-year maintenance plan with each system purchase. Annual included maintenance consists of a maximum of two (2) scheduled visits. Additional maintenance may be necessary depending on sediment and trash loading (by Owner or at additional cost). The start of the maintenance plan begins when the system is activated. Maintenance visits are scheduled seasonally; the spring visit aims to clean up after winter loads including salts and sands while the fall visit helps the system by removing excessive leaf litter. It has been found that in regions which receive between 30-50 inches of annual rainfall, (2) two visits are generally required; regions with less rainfall often only require (1) one visit per annum. Varying land uses can affect maintenance frequency; e.g. some fast food restaurants require more frequent trash removal. Contributing drainage areas which are subject to new development wherein the recommended erosion and sediment control measures have not been implemented may require additional maintenance visits. Some sites may be subjected to extreme sediment or trash loads, requiring more frequent maintenance visits. This is the reason for detailed notes of maintenance actions per unit, helping the Supplier and Owner predict future maintenance frequencies, reflecting individual site conditions. Owners must promptly notify the (maintenance) Supplier of any damage to the plant(s), which constitute(s) an integral part of the bioretention technology. Owners should also advise other landscape or maintenance contractors to leave all maintenance to the Supplier (i.e. no pruning or fertilizing) during the first year. www.ContechES.com/filterra | 800-338-11228 Exclusion of Services Clean up due to major contamination such as oils, chemicals, toxic spills, etc. will result in additional costs and are not covered under the Supplier maintenance contract. Should a major contamination event occur the Owner must block off the outlet pipe of the Filterra (where the cleaned runoff drains to, such as drop inlet) and block off the throat of the Filterra. The Supplier should be informed immediately. Maintenance Visit Summary Each maintenance visit consists of the following simple tasks (detailed instructions below). 1. Inspection of Filterra and surrounding area 2. Removal of tree grate and erosion control stones 3. Removal of debris, trash and mulch 4. Mulch replacement 5. Plant health evaluation and pruning or replacement as necessary 6. Clean area around Filterra 7. Complete paperwork Maintenance Tools, Safety Equipment and Supplies Ideal tools include: camera, bucket, shovel, broom, pruners, hoe/rake, and tape measure. Appropriate Personal Protective Equipment (PPE) should be used in accordance with local or company procedures. This may include impervious gloves where the type of trash is unknown, high visibility clothing and barricades when working in close proximity to traffic and also safety hats and shoes. A T-Bar or crowbar should be used for moving the tree grates (up to 170 lbs ea.). Most visits require minor trash removal and a full replacement of mulch. See below for actual number of bagged mulch that is required in each media bay size. Mulch should be a double shredded, hardwood variety. Some visits may require additional Filterra engineered soil media available from the Supplier. Box Length Box Width Filter Surface Area (ft²)Volume at 3” (ft³)# of 2 ft³ Mulch Bags 4 4 16 4 2 6 4 24 6 3 8 4 32 8 4 6 6 36 9 5 8 6 48 12 6 10 6 60 15 8 12 6 72 18 9 13 7 91 23 12 www.ContechES.com/filterra | 800-338-1122 9 1. Inspection of Filterra and surrounding area • Record individual unit before maintenance with photograph (numbered). Record on Maintenance Report (see example in this document) the following: 2. Removal of tree grate and erosion control stones • Remove cast iron grates for access into Filterra box. • Dig out silt (if any) and mulch and remove trash & foreign items. 3. Removal of debris, trash and mulch • After removal of mulch and debris, measure distance from the top of the Filterra engineered media soil to the top of the top slab. Compare the measured distance to the distance shown on the approved Contract Drawings for the system. Add Filterra media (not top soil or other) to bring media up as needed to distance indicated on drawings. Record on Maintenance Report the following: Standing Water yes | no Damage to Box Structure yes | no Damage to Grate yes | no Is Bypass Clear yes | no If yes answered to any of these observations, record with close-up photograph (numbered). Record on Maintenance Report the following: Silt/Clay yes | no Cups/ Bags yes | no Leaves yes | no Buckets Removed ________ Record on Maintenance Report the following: Distance to Top of Top Slab (inches) ________ Inches of Media Added ________ Maintenance Visit Procedure Keep sufficient documentation of maintenance actions to predict location specific maintenance frequencies and needs. An example Maintenance Report is included in this manual. www.ContechES.com/filterra | 800-338-112210 4. Mulch replacement • Add double shredded mulch evenly across the entire unit to a depth of 3”. • Refer to Filterra Mulch Specifications for information on acceptable sources. • Ensure correct repositioning of erosion control stones by the Filterra inlet to allow for entry of trash during a storm event. • Replace Filterra grates correctly using appropriate lifting or moving tools, taking care not to damage the plant. 5. Plant health evaluation and pruning or replacement as necessary • Examine the plant’s health and replace if necessary. • Prune as necessary to encourage growth in the correct directions 6. Clean area around Filterra • Clean area around unit and remove all refuse to be disposed of appropriately. 7. Complete paperwork • Deliver Maintenance Report and photographs to appropriate location (normally Contech during maintenance contract period). • Some jurisdictions may require submission of maintenance reports in accordance with approvals. It is the responsibility of the Owner to comply with local regulations. Record on Maintenance Report the following: Height above Grate _____________________(ft) Width at Widest Point _____________________(ft) Health healthy | unhealthy Damage to Plant yes | no Plant Replaced yes | no www.ContechES.com/filterra | 800-338-1122 11 Maintenance Checklist Filterra Inspection & Maintenance Log Filterra System Size/Model: _____________________________Location: ____________________________________________ Drainage System Failure Problem Conditions to Check Condition that Should Exist Actions Inlet Excessive sediment or trash accumulation. Accumulated sediments or trash impair free flow of water into Filterra. Inlet should be free of obstructions allowing free distributed flow of water into Filterra. Sediments and/or trash should be removed. Mulch Cover Trash and floatable debris accumulation.Excessive trash and/or debris accumulation.Minimal trash or other debris on mulch cover. Trash and debris should be removed and mulch cover raked level. Ensure bark nugget mulch is not used. Mulch Cover “Ponding” of water on mulch cover. “Ponding” in unit could be indicative of clogging due to excessive fine sediment accumulation or spill of petroleum oils. Stormwater should drain freely and evenly through mulch cover. Recommend contact manufacturer and replace mulch as a minimum. Vegetation Plants not growing or in poor condition. Soil/mulch too wet, evidence of spill. Incorrect plant selection. Pest infestation. Vandalism to plants. Plants should be healthy and pest free.Contact manufacturer for advice. Vegetation Plant growth excessive. Plants should be appropriate to the species and location of Filterra. Trim/prune plants in accordance with typical landscaping and safety needs. Structure Structure has visible cracks. Cracks wider than 1/2 inch or evidence of soil particles entering the structure through the cracks. Vault should be repaired. Maintenance is ideally to be performed twice annually. Date Mulch & Debris Removed Depth of Mulch Added Mulch Brand Height of Vegetation Above Grate Vegetation Species Issues with System Comments 1/1/17 5 – 5 gal Buckets 3”Lowe’s Premium Brown Mulch 4’Galaxy Magnolia - Standing water in downstream structure - Removed blockage in downstream structure www.ContechES.com/filterra | 800-338-112212 Appendix 1 – Filterra® Activation Checklist Project Name: ________________________________________Company: ______________________________________________ Site Contact Name: _______________________________________Site Contact Phone/Email: ____________________________ Site Owner/End User Name: _________________________Site Owner/End User Phone/Email: ____________________________ Preferred Activation Date: ___________________________________(provide 2 weeks minimum from date this form is submitted) Site Designation System Size Final Pavement / Top Coat Complete Landscaping Complete / Grass Emerging Construction materials / Piles / Debris Removed Throat Opening Measures 4” Min. Height Plant Species Requested Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No NOTE: A charge of $500.00 will be invoiced for each Activation visit requested by Customer where Contech determines that the site does not meet the conditions required for Activation. ONLY Contech authorized representatives can perform Activation of Filterra systems; unauthorized Activations will void the system warranty and waive manufacturer supplied Activation and 1st Year Maintenance. Attach additional sheets as necessary. Signature Date ENGINEERED SOLUTIONS www.ContechES.com/filterra | 800-338-1122 13 Appendix 2 – Planting Requirements for Filterra® Systems Plant Material Selection • Select plant(s) as specified in the engineering plans and specifications. • Select plant(s) with full root development but not to the point where root bound. • Use local nursery container plants only. Ball and burlapped plants are not permitted. • For precast Filterra systems with a tree grate, plant(s) must not have scaffold limbs at least 14 inches from the crown due to spacing between the top of the mulch and the tree grate. Lower branches can be pruned away provided there are sufficient scaffold branches for tree or shrub development. • For precast Filterra systems with a tree grate, at the time of installation, it is required that plant(s) must be at least 6” above the tree grate opening at installation for all Filterra configurations. This DOES NOT apply to Full Grate Cover designs. • Plant(s) shall not have a mature height greater than 25 feet. • For standard 21” media depth, a 7 – 15 gallon container size shall be used. Media less than 21” (Filterra boxes only) will require smaller container plants. • For precast Filterra systems, plant(s) should have a single trunk at installation, and pruning may be necessary at activation and maintenance for some of the faster growing species, or species known to produce basal sprouts. Plant Installation • During transport protect the plant leaves from wind and excessive jostling. • Prior to removing the plant(s) from the container, ensure the soil moisture is sufficient to maintain the integrity of the root ball. If needed, pre-wet the container plant. • Cut away any roots which are growing out of the container drain holes. Plants with excessive root growth from the drain holes should be rejected. • Plant(s) should be carefully removed from the pot by gently pounding on the sides of the container with the fist to loosen root ball. Then carefully slide out. Do not lift plant(s) by trunk as this can break roots and cause soil to fall off. Extract the root ball in a horizontal position and support it to prevent it from breaking apart. Alternatively the pot can be cut away to minimize root ball disturbance. • Remove any excess soil from above the root flare after removing plant(s) from container. • Excavate a hole with a diameter 4” greater than the root ball, gently place the plant(s). • If plant(s) have any circling roots from being pot bound, gently tease them loose without breaking them. • If root ball has a root mat on the bottom, it should be shaved off with a knife just above the mat line. • Plant the tree/shrub/grass with the top of the root ball 1” above surrounding media to allow for settling. • All plants should have the main stem centered in the tree grate (where applicable) upon completion of installation. • With all trees/shrubs, remove dead, diseased, crossed/rubbing, sharply crotched branches or branches growing excessively long or in wrong direction compared to majority of branches. • To prevent transplant shock (especially if planting takes place in the hot season), it may be necessary to prune some of the foliage to compensate for reduced root uptake capacity. This is accomplished by pruning away some of the smaller secondary branches or a main scaffold branch if there are too many. Too much foliage relative to the root ball can dehydrate and damage the plant. • Plant staking may be required. www.ContechES.com/filterra | 800-338-112214 Mulch Installation • Only mulch that has been meeting Contech Engineered Solutions’ mulch specifications can be used in the Filterra system. • Mulch must be applied to a depth of 3” evenly over the surface of the media. Irrigation Requirements • Each Filterra system must receive adequate irrigation to ensure survival of the living system during periods of drier weather. • Irrigation sources include rainfall runoff from downspouts and/or gutter flow, applied water through the tree grate or in some cases from an irrigation system with emitters installed during construction. • At Activation: Apply about one (cool climates) to two (warm climates) gallons of water per inch of trunk diameter over the root ball. • During Establishment: In common with all plants, each Filterra plant will require more frequent watering during the establishment period. One inch of applied water per week for the first three months is recommended for cooler climates (2 to 3 inches for warmer climates). If the system is receiving rainfall runoff from the drainage area, then irrigation may not be needed. Inspection of the soil moisture content can be evaluated by gently brushing aside the mulch layer and feeling the soil. Be sure to replace the mulch when the assessment is complete. Irrigate as needed**. • Established Plants: Established plants have fully developed root systems and can access the entire water column in the media. Therefore irrigation is less frequent but requires more applied water when performed. For a mature system assume 3.5 inches of available water within the media matrix. Irrigation demand can be estimated as 1” of irrigation demand per week. Therefore if dry periods exceed 3 weeks, irrigation may be required. It is also important to recognize that plants which are exposed to windy areas and reflected heat from paved surfaces may need more frequent irrigation. Long term care should develop a history which is more site specific. ** Five gallons per square yard approximates 1 inch of water Therefore for a 6’ by 6’ Filterra approximately 20-60 gallons of water is needed. To ensure even distribution of water it needs to be evenly sprinkled over the entire surface of the filter bed, with special attention to make sure the root ball is completely wetted. NOTE: if needed, measure the time it takes to fill a five gallon bucket to estimate the applied water flow rate then calculate the time needed to irrigate the Filterra. For example, if the flow rate of the sprinkler is 5 gallons/minute then it would take 12 minutes to irrigate a 6’ by 6’ filter. Notes ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ ___________________________________________________________________________________________________________ PDF 6/20 © 2020 Contech Engineered Solutions LLC, a QUIKRETE Company 9025 Centre Pointe Drive, Suite 400 West Chester, OH 45069 info@conteches.com | 800-338-1122 www.ContechES.com ALL RIGHTS RESERVED. PRINTED IN THE USA. NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. ® Bioretention Systems ENGINEERED SOLUTIONS APPENDIX A PIPE CAPACITY PUMP CURVE WWHM12 WATER QUALITY RESULTS WWHM12 VAULT RESULTS WWHM2012 PROJECT REPORT WATER QUALITY FLOWS 15-min online adjusted flow rate 0.0455 cfs default[12]1/9/2025 11:41:19 AM Page 2 General Model Information Project Name:default[12] Site Name: Site Address: City: Report Date:1/9/2025 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year default[12]1/9/2025 11:41:19 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.26 Pervious Total 0.26 Impervious Land Use acre Impervious Total 0 Basin Total 0.26 Element Flows To: Surface Interflow Groundwater default[12]1/9/2025 11:41:19 AM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS MOD 0.19 SIDEWALKS FLAT 0.07 Impervious Total 0.26 Basin Total 0.26 Element Flows To: Surface Interflow Groundwater default[12]1/9/2025 11:41:19 AM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.26 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.26 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.007742 5 year 0.012685 10 year 0.015864 25 year 0.019645 50 year 0.022264 100 year 0.024711 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.110353 5 year 0.140102 10 year 0.160393 25 year 0.186796 50 year 0.207058 100 year 0.227857 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.009 0.141 1950 0.011 0.149 1951 0.017 0.085 1952 0.005 0.071 1953 0.004 0.087 1954 0.007 0.088 1955 0.011 0.105 1956 0.008 0.096 1957 0.007 0.107 1958 0.008 0.091 default[12]1/9/2025 11:41:46 AM Page 13 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0.0315 acre-feet On-line facility target flow:0.0455 cfs. Adjusted for 15 min:0.0455 cfs. Off-line facility target flow:0.0256 cfs. Adjusted for 15 min:0.0256 cfs. default[12]1/9/2025 11:41:54 AM Page 28 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2025; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com WWHM2012 PROJECT REPORT SSD- RUN 3: 1,568 SF 98 FT X 16-FT X 7-FT default[15] 3/27/2025 9:22:40 AM Page 2 General Model Information Project Name: default[15] Site Name: Site Address: City: Report Date: 3/27/2025 Gage: Seatac Data Start: 1948/10/01 Data End: 2009/09/30 Timestep: 15 Minute Precip Scale: 1.000 Version Date: 2019/09/13 Version: 4.2.17 POC Thresholds Low Flow Threshold for POC1: 50 Percent of the 2 Year High Flow Threshold for POC1: 50 Year default[15] 3/27/2025 9:22:40 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 No No acre0.7 0.7 Bypass: GroundWater: Pervious Land Use acre Impervious Total 0 Basin Total 0.7 Element Flows To:Surface Interflow Groundwater C, Forest, MOD Pervious Total Impervious Land Use default[15] 3/27/2025 9:22:40 AM Page 4 Mitigated Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Lawn, Flat 0.25 Pervious Total 0.25 Impervious Land Use acre ROADS MOD 0.19 ROOF TOPS FLAT 0.19 SIDEWALKS FLAT 0.07 Impervious Total 0.45 Basin Total 0.7 Element Flows To:Surface Interflow GroundwaterSSD Table 1 SSD Table 1 default[15] 3/27/2025 9:22:40 AM Page 6 Mitigated Routing SSD Table 1 Depth: 7 ft.Element Flows To:Outlet 1 Outlet 2 SSD Table Hydraulic Table Stage Area Volume(feet) (ac.) (ac-ft.) Manual Manual NotUsed NotUsed NotUsed0.100 0.036 0.000 0.000 0.000 0.000 0.000 0.0000.200 0.036 0.007 0.015 0.000 0.000 0.0000.400 0.036 0.014 0.015 0.000 0.000 0.0000.600 0.036 0.022 0.015 0.000 0.000 0.0000.800 0.036 0.029 0.015 0.000 0.000 0.0001.000 0.036 0.036 0.015 0.000 0.000 0.0001.200 0.036 0.043 0.015 0.000 0.000 0.0001.400 0.036 0.050 0.015 0.000 0.000 0.0001.600 0.036 0.058 0.015 0.000 0.000 0.0001.800 0.036 0.065 0.015 0.000 0.000 0.0002.000 0.036 0.072 0.015 0.000 0.000 0.0002.200 0.036 0.079 0.015 0.000 0.000 0.0002.400 0.036 0.086 0.015 0.000 0.000 0.0002.600 0.036 0.094 0.015 0.000 0.000 0.0002.800 0.036 0.101 0.015 0.000 0.000 0.0003.000 0.036 0.108 0.015 0.000 0.000 0.0003.200 0.036 0.115 0.015 0.000 0.000 0.0003.400 0.036 0.122 0.015 0.000 0.000 0.0003.600 0.036 0.130 0.015 0.000 0.000 0.0003.800 0.036 0.137 0.015 0.000 0.000 0.0004.000 0.036 0.144 0.015 0.000 0.000 0.0004.200 0.036 0.151 0.015 0.000 0.000 0.0004.400 0.036 0.158 0.015 0.000 0.000 0.0004.600 0.036 0.166 0.015 0.000 0.000 0.0004.800 0.036 0.173 0.015 0.000 0.000 0.0005.000 0.036 0.180 0.015 0.000 0.000 0.0005.200 0.036 0.187 0.015 0.000 0.000 0.0005.400 0.036 0.194 0.015 0.000 0.000 0.0005.600 0.036 0.202 0.015 0.000 0.000 0.0005.800 0.036 0.209 0.015 0.000 0.000 0.0006.000 0.036 0.216 0.015 0.000 0.000 0.0006.200 0.036 0.223 0.015 0.000 0.000 0.0006.400 0.036 0.230 0.015 0.000 0.000 0.0006.800 0.036 0.245 0.015 0.000 0.000 0.0007.000 0.036 0.252 0.015 0.000 0.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.000 0.000 0.000 default[15] 3/27/2025 9:22:40 AM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1Total Pervious Area: 0.7Total Impervious Area: 0 Mitigated Landuse Totals for POC #1Total Pervious Area: 0.25Total Impervious Area: 0.45 Flow Frequency Method: Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1Return Period Flow(cfs)2 year 0.0313245 year 0.04989610 year 0.06195425 year 0.07653850 year 0.086837100 year 0.096631 Flow Frequency Return Periods for Mitigated. POC #1Return Period Flow(cfs)2 year 0.0162185 year 0.02289610 year 0.02825925 year 0.03622550 year 0.043106100 year 0.050872 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1Year Predeveloped Mitigated1949 0.035 0.0151950 0.039 0.0151951 0.061 0.0451952 0.023 0.0151953 0.017 0.0151954 0.025 0.0151955 0.045 0.0151956 0.034 0.0151957 0.032 0.0151958 0.030 0.015 default[15] 3/27/2025 9:23:06 AM Page 8 1959 0.025 0.0151960 0.045 0.0151961 0.024 0.0151962 0.018 0.0151963 0.023 0.0151964 0.028 0.0151965 0.022 0.0151966 0.020 0.0151967 0.046 0.0151968 0.026 0.0151969 0.027 0.0151970 0.024 0.0151971 0.025 0.0151972 0.049 0.0151973 0.024 0.0151974 0.024 0.0151975 0.038 0.0151976 0.026 0.0151977 0.005 0.0151978 0.025 0.0151979 0.013 0.0151980 0.058 0.0441981 0.019 0.0151982 0.047 0.0151983 0.032 0.0151984 0.022 0.0151985 0.013 0.0151986 0.055 0.0151987 0.048 0.0151988 0.021 0.0151989 0.012 0.0151990 0.103 0.0151991 0.060 0.0171992 0.026 0.0151993 0.024 0.0151994 0.008 0.0151995 0.030 0.0151996 0.069 0.0171997 0.061 0.0591998 0.019 0.0151999 0.054 0.0152000 0.026 0.0152001 0.006 0.0152002 0.029 0.0152003 0.039 0.0152004 0.057 0.0532005 0.036 0.0152006 0.036 0.0152007 0.078 0.0592008 0.104 0.0572009 0.048 0.015 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1Rank Predeveloped Mitigated1 0.1035 0.05902 0.1033 0.05903 0.0782 0.0573 default[15] 3/27/2025 9:23:06 AM Page 9 4 0.0688 0.05335 0.0612 0.04506 0.0612 0.04447 0.0601 0.01758 0.0575 0.01709 0.0566 0.015010 0.0550 0.015011 0.0542 0.015012 0.0490 0.015013 0.0482 0.015014 0.0477 0.015015 0.0469 0.015016 0.0461 0.015017 0.0452 0.015018 0.0448 0.015019 0.0386 0.015020 0.0385 0.015021 0.0378 0.015022 0.0363 0.015023 0.0362 0.015024 0.0352 0.015025 0.0340 0.015026 0.0324 0.015027 0.0320 0.015028 0.0303 0.015029 0.0301 0.015030 0.0295 0.015031 0.0285 0.015032 0.0274 0.015033 0.0260 0.015034 0.0259 0.015035 0.0259 0.015036 0.0258 0.015037 0.0249 0.015038 0.0248 0.015039 0.0247 0.015040 0.0246 0.015041 0.0244 0.015042 0.0243 0.015043 0.0243 0.015044 0.0243 0.015045 0.0242 0.015046 0.0229 0.015047 0.0228 0.015048 0.0225 0.015049 0.0216 0.015050 0.0207 0.015051 0.0197 0.015052 0.0194 0.015053 0.0188 0.015054 0.0177 0.015055 0.0173 0.015056 0.0126 0.015057 0.0125 0.015058 0.0125 0.015059 0.0083 0.015060 0.0058 0.015061 0.0045 0.0150 default[15] 3/27/2025 9:23:06 AM Page 11 Duration Flows The Facility PASSED Flow(cfs) Predev Mit Percentage Pass/Fail0.0157 11407 801 7 Pass0.0164 10365 751 7 Pass0.0171 9450 701 7 Pass0.0178 8637 665 7 Pass0.0185 7944 635 7 Pass0.0193 7279 612 8 Pass0.0200 6675 590 8 Pass0.0207 6100 567 9 Pass0.0214 5612 541 9 Pass0.0221 5150 524 10 Pass0.0229 4770 510 10 Pass0.0236 4408 490 11 Pass0.0243 4075 476 11 Pass0.0250 3769 465 12 Pass0.0257 3544 454 12 Pass0.0264 3290 441 13 Pass0.0272 3069 427 13 Pass0.0279 2862 404 14 Pass0.0286 2667 386 14 Pass0.0293 2479 358 14 Pass0.0300 2306 325 14 Pass0.0308 2158 305 14 Pass0.0315 1975 281 14 Pass0.0322 1828 265 14 Pass0.0329 1684 251 14 Pass0.0336 1573 242 15 Pass0.0344 1459 233 15 Pass0.0351 1362 229 16 Pass0.0358 1268 222 17 Pass0.0365 1173 213 18 Pass0.0372 1100 208 18 Pass0.0379 1030 201 19 Pass0.0387 962 195 20 Pass0.0394 905 188 20 Pass0.0401 849 185 21 Pass0.0408 802 175 21 Pass0.0415 750 170 22 Pass0.0423 715 160 22 Pass0.0430 679 151 22 Pass0.0437 638 148 23 Pass0.0444 605 139 22 Pass0.0451 572 135 23 Pass0.0459 542 133 24 Pass0.0466 504 130 25 Pass0.0473 469 128 27 Pass0.0480 435 127 29 Pass0.0487 391 120 30 Pass0.0495 351 120 34 Pass0.0502 321 114 35 Pass0.0509 293 109 37 Pass0.0516 264 101 38 Pass0.0523 230 96 41 Pass0.0530 203 93 45 Pass default[15] 3/27/2025 9:23:06 AM Page 12 0.0538 177 88 49 Pass0.0545 160 86 53 Pass0.0552 141 84 59 Pass0.0559 130 81 62 Pass0.0566 116 77 66 Pass0.0574 103 69 66 Pass0.0581 95 68 71 Pass0.0588 79 66 83 Pass0.0595 71 0 0 Pass0.0602 58 0 0 Pass0.0610 49 0 0 Pass0.0617 46 0 0 Pass0.0624 44 0 0 Pass0.0631 43 0 0 Pass0.0638 42 0 0 Pass0.0645 41 0 0 Pass0.0653 40 0 0 Pass0.0660 39 0 0 Pass0.0667 36 0 0 Pass0.0674 34 0 0 Pass0.0681 34 0 0 Pass0.0689 31 0 0 Pass0.0696 28 0 0 Pass0.0703 26 0 0 Pass0.0710 25 0 0 Pass0.0717 22 0 0 Pass0.0725 20 0 0 Pass0.0732 18 0 0 Pass0.0739 14 0 0 Pass0.0746 13 0 0 Pass0.0753 11 0 0 Pass0.0761 10 0 0 Pass0.0768 10 0 0 Pass0.0775 800Pass0.0782 600Pass0.0789 400Pass0.0796 400Pass0.0804 400Pass0.0811 300Pass0.0818 300Pass0.0825 300Pass0.0832 300Pass0.0840 300Pass0.0847 300Pass0.0854 300Pass0.0861 300Pass0.0868 300Pass default[15] 3/27/2025 9:23:06 AM Page 13 Water Quality Water Quality BMP Flow and Volume for POC #1On-line facility volume: 0 acre-feetOn-line facility target flow: 0 cfs.Adjusted for 15 min: 0 cfs.Off-line facility target flow: 0 cfs.Adjusted for 15 min: 0 cfs. default[15] 3/27/2025 9:23:06 AM Page 14 LID Report default[15] 3/27/2025 9:23:14 AM Page 15 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. default[15] 3/27/2025 9:23:14 AM Page 16 Appendix Predeveloped Schematic default[15] 3/27/2025 9:23:14 AM Page 17 Mitigated Schematic default[15] 3/27/2025 9:23:14 AM Page 18 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 default[15].wdm MESSU 25 Predefault[15].MES 27 Predefault[15].L61 28 Predefault[15].L62 30 POCdefault[15]1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 12 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 12 C, Forest, Steep 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 12 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 12 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO default[15] 3/27/2025 9:23:14 AM Page 19 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 12 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 12 0 4.5 0.08 400 0.15 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 12 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 12 0.2 0.3 0.35 6 0.3 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 12 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 default[15] 3/27/2025 9:23:14 AM Page 20 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 12 0.7 COPY 501 12 PERLND 12 0.7 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC default[15] 3/27/2025 9:23:14 AM Page 21 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN default[15] 3/27/2025 9:23:15 AM Page 22 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 default[15].wdm MESSU 25 Mitdefault[15].MES 27 Mitdefault[15].L61 28 Mitdefault[15].L62 30 POCdefault[15]1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 16 IMPLND 2 IMPLND 4 IMPLND 8 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 SSD Table 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO default[15] 3/27/2025 9:23:15 AM Page 23 <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 8 SIDEWALKS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 4 0 0 1 0 0 0 8 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 8 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 2 0 0 0 0 0 4 0 0 0 0 0 8 0 0 0 0 0 default[15] 3/27/2025 9:23:15 AM Page 24 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 4 400 0.01 0.1 0.1 8 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 2 0 0 4 0 0 8 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 4 0 0 8 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 16 0.25 RCHRES 1 2 PERLND 16 0.25 RCHRES 1 3 IMPLND 2 0.19 RCHRES 1 5 IMPLND 4 0.19 RCHRES 1 5 IMPLND 8 0.07 RCHRES 1 5 ******Routing****** PERLND 16 0.25 COPY 1 12 IMPLND 2 0.19 COPY 1 15 IMPLND 4 0.19 COPY 1 15 IMPLND 8 0.07 COPY 1 15 PERLND 16 0.25 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 SSD Table 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** default[15] 3/27/2025 9:23:15 AM Page 25 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 35 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.100000 0.050000 0.000000 0.000000 0.200000 0.050000 0.010000 0.015000 0.400000 0.050000 0.020000 0.015000 0.600000 0.050000 0.030000 0.015000 0.800000 0.050000 0.040000 0.015000 1.000000 0.050000 0.050000 0.015000 1.200000 0.050000 0.060000 0.015000 1.400000 0.050000 0.070000 0.015000 1.600000 0.050000 0.080000 0.015000 1.800000 0.050000 0.090000 0.015000 2.000000 0.050000 0.100000 0.015000 2.200000 0.050000 0.110000 0.015000 2.400000 0.050000 0.120000 0.015000 2.600000 0.050000 0.130000 0.015000 2.800000 0.050000 0.140000 0.015000 3.000000 0.050000 0.150000 0.015000 3.200000 0.050000 0.160000 0.015000 3.400000 0.050000 0.170000 0.059000 3.600000 0.050000 0.180000 0.059000 3.800000 0.050000 0.190000 0.059000 4.000000 0.050000 0.200000 0.059000 4.200000 0.050000 0.210000 0.059000 4.400000 0.050000 0.220000 0.059000 4.600000 0.050000 0.230000 0.059000 4.800000 0.050000 0.240000 0.059000 5.000000 0.050000 0.250000 0.059000 5.200000 0.050000 0.260000 0.059000 5.400000 0.050000 0.270000 0.059000 5.600000 0.050000 0.280000 0.059000 5.800000 0.050000 0.290000 0.059000 6.000000 0.050000 0.300000 0.059000 6.200000 0.050000 0.310000 0.059000 default[15] 3/27/2025 9:23:15 AM Page 26 6.400000 0.050000 0.320000 0.059000 6.800000 0.050000 0.340000 0.059000 7.000000 0.050000 0.350000 0.059000 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN default[15] 3/27/2025 9:23:15 AM Page 29 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2025; All Rights Reserved. Clear Creek Solutions, Inc.6200 Capitol Blvd. Ste FOlympia, WA. 98501Toll Free 1(866)943-0304Local (360)943-0304 www.clearcreeksolutions.com