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APPROVED STM DRAINAGE REPORT PLN2019-0041 MURESAN SP STORMWATER DRAINAGE REPORT For Muresan Short Plat 15809 70th Avenue West Edmonds, Washington City of Edmonds Project # PLN20190041 Issue Date: June 19, 2019 Revision Date: May 13, 2021 PREPARED & REVIEWED BY: TIMOTHY SARKELA, P.E. 05-25-21 CLIENT(S): David Muresan WESTERN ENGINEERS, INC. 8616 196TH STREET SW Job No. 18-1751-A EDMONDS, WA 98026 RESUB CITY OF EDMONDS DEVELOPMENT SERVICES DEPARTMENT JUN 02 2021 COMPLIES WITH APPLICABLE CITY STORMWATER CODE 06/17/2021 Muresan – 3 Lot S.P. 1 WESI© PROJECT:18-1751-A 1. ATTACHMENT “A” DRAINAGE INFORMATION SUMMARY FORM Project Name: Muresan – 3 LOT S.P. Project Engineer: WESTERN ENGINEERS & SURVEYORS, INC. Project Applicant: David Muresan EDMONDS, WA Project Total Area: 1.004 Acres Number of Lots: 3 Summary Table Drainage Basin Information Individual Basin Designation A B C D On-site Development Area 0.709 ac. Type of Storage Proposed N/A, (DRYWELLS & BIORETENTION) Approximate Storage Volume N/A Soil types ALDERWOOD Type C Muresan – 3 Lot S.P. 2 WESI© PROJECT:18-1751-A Minimum Requirement # 1: Stormwater Site Plan Executive Summary The proposed project is located at 15809 70th Avenue West in the City of Edmonds, within Snohomish County, Washington. More generally, the site is located in Section 05, Township 27 North, and Range 4 East of the Willamette Meridian in Edmonds, Washington. Please refer to the Vicinity Map attached in the next section. The project contains approximately 1.04 acres, which includes on-site areas covered by an existing house, shed, concrete patios and walkways, and asphalt driveway along with off-site areas within the frontage development area. The preliminary proposal is to subdivide 0.975 acres (after 10’ right-of-way dedication) into three housing lots and a private road tract. The existing house and portions of patio/walkway on proposed Lot 2 will be retained. The current driveway access to 70th Avenue West will be removed. All proposed lots will access 70th Avenue West via a proposed 16’ to 20’ wide paved private road within a 20’ to 24’ wide private road tract. A 20’ wide private road to the first home with “No Parking-Fire Lane” signs is required by the fire marshal and has been shown on the development plans. Full infiltration for new roof areas on Lots 1 and 2 will be provided by infiltration dry well BMP T5.10A. A roof drain refit will be applied to 740 sf of existing roof area (25% of existing hardscape to remain) which will convey runoff to a new drywell. Full infiltration and treatment for new road and driveway areas will be provided by bioretention infiltration BMP T7.30, individually for some areas and within a common bioretention cell for the remainder. Full infiltration of new roof and driveway areas on Lot 3 will be provided by conveying runoff to the common bioretention cell. According to soil tests by Nelson Geotechnical Associates, Inc. on-site soils do not contain adequate cation exchange capacity for water quality treatment; therefore, permeable pavement BMP T5.15 is not recommended because pollution generating surfaces utilizing permeable pavement would bypass water quality treatment. Disturbed vegetated areas will be amended per soil quality BMP T5.13. More than 30% of the on-site area will be set aside in a Native Vegetation Preservation easement, wherein existing trees will be protected, and new trees will be planted to provide full canopy coverage. These areas will be protected in perpetuity and unauthorized clearing or installation of improvements within these areas will not be allowed. According to the vegetation retention plan, activity in these areas will be limited to removal of invasive species and authorized maintenance or replanting of specified vegetation. Refer to Native Vegetation Plan for vegetation protection and planting requirements. The ongoing protection measures for these areas will be recorded on the final plat map according to City of Edmonds code requirements and be carried out according to the stipulations of the Native Vegetation Plan. Muresan – 3 Lot S.P. 3 WESI© PROJECT:18-1751-A Existing Conditions Summary The site is partially developed with an existing house, shed, concrete patios and walkways, and asphalt driveway on the northern and eastern portions of the property. Existing on-site vegetation primarily consists of tree cover with residential lawn around existing on-site improvements. The site generally slopes toward an on-site ravine that flows in a northwesterly direction. Slopes on-site range approximately from 4% to 80%. From the Soil Conservation Service Map of Snohomish County, the site contains Alderwood Urban Land Complex type soils. From soil logs taken by Nelson Geotechnical Associates, Inc., soils appear to consist of gravelly sand and sandy gravel with trace silt. Per NGA memorandum dated October 24, 2019 there are no groundwater or impermeable horizons within 5 feet of the base of proposed infiltration systems. A soil infiltration test by Nelson Geotechnical Associates Inc. indicates a measured infiltration rate of 16.04 to 18.53 inches per hour, which provides a long-term design infiltration rate of 4.86 inches per hour. Also, per NGA memorandum dated October 24, 2019, site soils have a Cation Exchange Capacity (CEC) of 4.8 meq per 100g, less than the 5 meq required for stormwater treatment. Please refer to the soil map and descriptions attached later in this report and refer to a separate report by Nelson Geotechnical Associates Inc. for additional soil information. Muresan – 3 Lot S.P. 4 WESI© PROJECT:18-1751-A VICINITY MAP MAP TAKEN FROM GOOGLE MAPS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com MURESAN SHORT PLAT EDMONDS, WA 98026 SCALE: 1” = ~1,800’ DATE: 12/13/18 CHECKED: JAJ BY: TAS JOB NUMBER: 18-1751-A FILE NAME: 181751A/VICINITYMAP Muresan – 3 Lot S.P. 5 WESI© PROJECT:18-1751-A OFFSITE ANALYSIS Site reconnaissance was done by Timothy Sarkela, P.E. of Western Engineers Inc. on March 26, 2018. Weather during the investigation was mostly cloudy with a temperature around 55 degrees. A: Upstream Analysis It appears from the topography of the site that upstream sheet flows may occur from paved driveways, lawn areas, and lightly forested to the north, south, and east. However, during the site visit, no evidence of any significant flows was observed. Any contributions to surface flows from off-site are expected to be minor and no other significant upstream flows appear to enter the property. The current frontage drainage will be retained by the proposed development and the existing paved swale will continue to operate. Runoff originating from 70th Avenue West, to the west of the site, is intercepted by an existing paved swale along the east edge of 70th Avenue West. Runoff within the swale is directed to a catch basin at the low point of the road near the northwest site corner. It does not appear runoff from 70th Avenue West enters the site. B: Downstream Analysis Please refer to the Downstream Analysis Map attached in the next section for a detailed depiction of the downstream drainage course. The site is partially developed with an existing house, shed, concrete patios and walkways, and asphalt driveway on the northern and eastern portions of the property. The site generally slopes southerly (see photos 1 & 2) toward an on-site ravine within the southern and western portions of the site that flows in a northwesterly direction (see photo 3). Runoff within the ravine comes to a depression near the northwest corner of the property, which appears to have been created through fill grading for the installation of 70th Avenue West and the driveway on the adjacent property to the north. The depression is drained by a culvert routing flow to the public drainage system within 70th Avenue West. The outlet culvert was not clearly located during survey due to overgrown vegetation and may have been partially or completely buried. At the time of inspection by Western Engineers the outlet culvert was not clearly visible, but there was little standing water within the depression, indicating there is at least some outlet capacity provided by the existing culvert. It does not appear that the depression was designed to provide flow control for upstream properties. Runoff that enters the depression outlet culvert is conveyed approximately 30 feet west beneath 70th Avenue West (see photo 4). According to City of Edmonds drainage system maps, the drainage system continues approximately 1,000 feet westerly through private properties before entering the public storm drainage system along 158th Street SW. The drainage system continues 300 feet west along 158th Street SW before turning south to continue approximately 400 feet south along 75th Place West. The flow is then conveyed approximately 300 feet west into Puget Sound. As Puget Sound is the nearest receiving water, further downstream analysis is not required. Drainage Complaints There are no known drainage complaints for this site. Muresan – 3 Lot S.P. 6 WESI© PROJECT:18-1751-A BASIN AND AERIAL MAPS Muresan – 3 Lot S.P. 7 WESI© PROJECT:18-1751-A AERIAL AND DOWNSTREAM MAP TAKEN FROM GOOGLE EARTH 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com MURESAN SHORT PLAT EDMONDS, WA 98026 SCALE: 1”=320’ DATE: 12/13/18 CHECKED: JAJ BY: TAS JOB NUMBER: 18-1751-A FILE NAME: Aerial Map Muresan – 3 Lot S.P. 8 WESI© PROJECT:18-1751-A DOWNSTREAM PHOTOGRAPHS Muresan – 3 Lot S.P. 9 WESI© PROJECT:18-1751-A DOWNSTREAM PHOTOGRAPHS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com MURESAN SHORT PLAT EDMONDS, WA 98026 SCALE: None DATE: 05/02/19 SHEET: 1 OF 2 BY: TAS JOB NUMBER: 18-1751-A FILE NAME: Downstream 1.DOC DOWNSTREAM PHOTOGRAPHS PHOTO 1: Figure to the Left: Looking south from near the north side of the existing residence. PHOTO 2: Figure to the Right: Looking westerly along the existing driveway. Muresan – 3 Lot S.P. 10 WESI© PROJECT:18-1751-A DOWNSTREAM PHOTOGRAPHS 9740 Evergreen Way, Everett WA 98204 (425) 356-2700 (425) 356-2708 (FAX) westernengineers.com MURESAN SHORT PLAT EDMONDS, WA 98026 SCALE: None DATE: 05/02/19 SHEET: 2 OF 2 BY: TAS JOB NUMBER: 18-1751-A FILE NAME: Downstream 2.DOC DOWNSTREAM PHOTOGRAPHS PHOTO 3: Figure to the Left: Looking southeasterly toward the drainage inlet near the northwest corner of the site. PHOTO 4: Figure to the Right: Looking westerly toward the existing drainage system crossing westerly beneath 70th Avenue W. Muresan – 3 Lot S.P. 11 WESI© PROJECT:18-1751-A Minimum Requirement # 2: SWPPP Narrative Element #1: Mark Clearing Limits Clearing limits have been shown on the Temporary Erosion and Sedimentation Control Plans. Element #2: Establish Construction Entrance A temporary construction entrance has been shown at the location of the proposed driveway that is to access 70th Avenue West. All vehicles shall be free of debris prior to leaving the site. Element # 3: Control Flow Rates Flow rates during construction are to be contained through the installation of silt fencing along the western boundary of the clearing/construction limits. Element # 4: Install Sediment Controls Sediment controls mainly consist of installing silt fencing along the western boundary of the clearing/construction limits. Element # 5: Stabilize Soils All soils disturbed during site grading will be stabilized by use of the most appropriate BMP method available. These consist of short-term and long-term solutions. Short-term methods consist of compaction of the soils by vibratory roller or bulldozer. Long-term methods consist of straw covering over the soils (this is in the case of the project becoming dormant for greater than 1 month). At this time no wintertime grading or construction activities will occur. During construction periods longer than 1 working week (7 days) where the soils are exposed and un- worked will use the proscribed methods in the Storm Water Management Manual for Western Washington to reduce sedimentation transported offsite. If winter grading is conducted, all exposed soils shall be covered within 2 days. Element # 6: Protect Slopes Before final stabilization, cut and fill slopes will be stabilized with the most appropriate temporary BMP, such as matting or mulch. Upon project competition, slopes shall be protected with permanent seeding or sod. Element # 7: Protect Drain Inlets The off-site catch basins and culvert inlets 500 feet downstream of the site will be provided sediment protection with catch basin inserts and triangular silt dams or equivalent, respectively. Element # 8: Stabilize Channels and Outlets Channels and drainage outlets are not needed around the proposed development area on site. No stabilization is necessary. Existing channels or drainage outlets located within 500-feet of the property of the property should be routinely inspected for debris that may dam and/or aid erosion. Muresan – 3 Lot S.P. 12 WESI© PROJECT:18-1751-A Element # 9: Control Pollutants All pollutants from construction vehicles will be contained and disposed of in the approved manner consistent with state environmental policies. Any vehicle maintenance will be performed by authorized mechanics using drip pans and waste containment vessels. All pollutants will be disposed offsite at approved facilities. Element # 10: Control De-Watering De-watering of the site is not expected. If dewatering of the site is needed, all groundwater removed shall be retained and recharged into the ground after de- watering has been finalized. Element # 11: Maintain BMP’s All Temporary Erosion and Sedimentation Control (TESC) devices and equipment will be inspected and maintained on a weekly basis if not sooner, based on storm events contributing to runoff. When construction is complete and the site is stabilized, any existing sediment will be removed and stabilized onsite. Element # 12: Manage the Project A general construction manager will manage the project for or by the owners. The construction manager shall maintain all of the above items in order to minimize sediment transport and turbid water leaving the site. His job will entail continual observation of the grading operations to ensure minimal effects to adjacent properties and offsite waterways. Element # 13: Protect Low Impact Development BMPs Proposed infiltration/bioretention areas and soil amendment areas will be protected from compaction and disturbance when feasible. Minimal Requirement # 3: Water Pollution Source Control All proposed development is to consist of residential construction. No water pollution source control is needed. Minimum Requirement # 4: Preservation of Natural Drainage Systems and Outfalls, and provisions of off-site mitigation No changes to the existing drainage systems and outfalls are proposed with this development. Minimum Requirement #5 On-Site Storm Water Management The project results in more than 5,000 square feet of new/replaced hard surfaces and is considered a Category 2 project. Category 2 projects must evaluate Minimum Requirements 1 through 9 and select on-site stormwater BMPs according to List 2 of the SWMMWW for each proposed hard surface. Full infiltration of runoff from new surfaces is achieved with the use of roof drain drywells and road area bioretention cells. Refer to List 2 below for appropriate BMP selection or infeasibility description: Muresan – 3 Lot S.P. 13 WESI© PROJECT:18-1751-A Lawn and landscaped areas: • Post-Construction Soil Quality and Depth in accordance with BMP T5.13 in Chapter 5 of Volume V. (To be used in disturbed vegetated areas) Roofs feasibility description: 1. Full Dispersion per BMP T5.30 or Downspout Full Infiltration per BMP T5.10A. i. Full Dispersion is infeasible due to the lack of retained native forest vegetation. Full Infiltration is feasible for most roof areas due to an adequate depth of well-draining soil throughout most of the site. Per NGA memorandum dated October 24, 2019 there are no groundwater or impermeable horizons within 5 feet of the base of proposed infiltration systems. Drywell design for Lot 3 roof areas appears infeasible with the current grading design and those areas will be conveyed to a common bioretention cell on the west side of Lot 1. Refer to the runoff calculations section for conceptual dry well sizing for individual roof areas. 2. Bioretention per Volume V, Chapter 7. i. Lot 3 roof areas will be conveyed to a common bioretention cell on the west side of Lot 1. 3. Downspout Dispersion Systems in accordance with BMP T5.10B. i. N/A, Roof drainage handled by previously listed BMP. 4. Perforated Stub-out Connections in accordance with BMP T5.10C. i. N/A, Roof drainage handled by previously listed BMP. 5. Detention pipes in accordance with Edmonds Stormwater Addendum. i. N/A, Roof drainage handled by previously listed BMP. Other Hard Surfaces feasibility description: 1. Full Dispersion per BMP T5.30 i. As noted above, Full Dispersion is infeasible due to the lack of retained native forest vegetation. 2. Permeable Pavement per BMP T5.15, or Bioretention per BMP T7.30. i. Full infiltration through bioretention is feasible for proposed private road and driveway areas. Roads and driveways adjacent to areas not suitable for bioretention should be collected by catch basins and conveyed to the common bioretention cell within the lower portion of the site. Bioretention area on lot 1 is conceptual and final bioretention cell sizing will be evaluated during the building permit phase of the project. Refer to the runoff calculations section for private road bioretention sizing and driveway area bioretention conceptual sizing. 3. Sheet Flow Dispersion in accordance with BMP T5.12 or BMP T5.11. i. N/A, Other drainage handled by previously listed BMP. 4. Detention on pipes in accordance with Edmonds Stormwater Addendum. i. N/A, Other drainage handled by previously listed BMP. Existing Hard Surfaces retrofit description per EDC 18.30.060.D.5.B.i: Per Code section referenced, a minimum of 25% of existing hard surfaces to remain on- site shall be improved with on-site stormwater BMPs. Existing hard surfaces to remain Muresan – 3 Lot S.P. 14 WESI© PROJECT:18-1751-A through development on the property total approximately 2,960 sf. The minimum existing area required to be managed by stormwater BMP retrofit is 740 sf. At least 740 sf. of roof area will be conveyed to a new dry well located west of the existing house. Short Plat BMP Selection and Runoff Modelling Note: Stormwater runoff has been modeled using WWHM assuming that new roof areas, along with 740 sf of existing roof area on Lot 2, can be infiltrated using drywells and common bioretention. Proposed private road areas have been modeled as being conveyed to a bioretention cell within the northwestern portion of the site. Individual driveway areas have been broken up into smaller drainage areas flowing to individual bioretention cells where feasible. Individual bioretention overflows will be tight-lined to the on-site drainage system that discharges toward the public drainage system on 70th Avenue W. Driveway areas located immediately above steep slope areas should not flow directly to bioretention cells located above steep slopes and have instead been modeled to be conveyed to the private road bioretention cell located within the northwest area of the site. If driveway areas designed to drain to the private road bioretention cell are later found to be manageable with individual bioretention cells, then the proposed private road bioretention cell can be considered oversized for the remaining runoff. More than 30% of the property area will be placed in a Native Vegetation Retention easement, where existing and proposed native vegetation and trees will be protected in perpetuity. This area has been modeled as forested within the WWHM developed condition for the determination of the increased runoff rates above the existing condition. Minimum Requirement # 6: Runoff Treatment Due to the site proposing more than 5,000 sf. of new pollution generating hard surfaces, runoff treatment is required. Runoff from pollution generating hard surfaces will be managed by bioretention cell BMP T7.30. Private road areas and portions of Lot 2 driveway will be collected via catch basins and conveyed to a bioretention cell within the northwest portion of the site. Remaining driveway areas on Lot 2 will be managed by individual bioretention cells. Driveway BMPs on Lots 1 and 3 are conceptual and specific BMP layout and sizing is to be determined during the building permit phase of the project for each lot. Minimum Requirement # 7: Flow Control Due to the site proposing less than 10,000 sf of new/replaced effective hard surfaces, less than ¾ acres of forest to lawn conversion, less than 2.5 acres of forest to pasture conversion, and less than 0.10 cfs increase in 100-year runoff rate (1-hour time step), flow control is not required. Note that the existing site has been modeled as entirely forested. Proposed roof drain drywells and pavement area bioretention cells have been designed to utilize full infiltration. Refer to Runoff Calculations in the following section for BMP sizing for full infiltration along with a comparison of pre- developed and proposed runoff rates. Note that BMPs sized for Lots 1 and 3 are conceptual and may change based on future building permit submittals. Muresan – 3 Lot S.P. 15 WESI© PROJECT:18-1751-A The house addition and driveway areas on Lot 2 have been sized for development activities associated with the short plat construction plan and are sized alongside proposed private road BMPs. Roof area and a portion of driveway for a potential future accessory building BMPs on Lot 2 is are conceptual and may change based on future building permit submittals. More than 30% of the on-site area will be set aside in a Native Vegetation Preservation easement, wherein existing trees will be protected, and new trees will be planted to provide full canopy coverage. These areas will be protected in perpetuity and unauthorized clearing or installation of improvements within these areas will not be allowed. According to the vegetation retention plan, activity in these areas will be limited to removal of invasive species and authorized maintenance or replanting of specified vegetation. Refer to Native Vegetation Plan for vegetation protection and planting requirements. The ongoing protection measures for these areas will be recorded on the final plat map according to City of Edmonds code requirements and be carried out according to the stipulations of the Native Vegetation Plan. Since this area will be protected in perpetuity, it has been modeled as forested within the WWHM developed condition for the determination of the increased runoff rates above the existing condition. Total Property Area = 44,576 sf. (1.023 Ac.) Less Right-of-Way Dedication = 2,088 sf. (0.048 Ac.) Total On-Site Area = 42,488 sf. (0.975 Ac.) On-Site Clearing Area = 29,588 sf. (0.679 Ac.) Plus Off-Site Clearing Area = 3,200 sf. (0.073 Ac.) Total Clearing Area = 32,788 sf. (0.753 Ac.) Existing Site Before Clearing On-Site Hardscape Area: Existing SFR Roof = 1,900 sf. ± Existing Asphalt Driveway = 2,950 sf. ± Ex. Walk/Patio/Tub Remain = 800 sf. ± Ex. Pond to Remain = 260 sf. ± Existing Shed to be Removed = 260 sf. ± Total = 5,910 sf. (0.136 Ac.) On-Site Vegetated Area: Existing Lawn Area = 2,000 sf. (0.046 Ac.) Existing Tree Cover = 34,578 sf. (0.793 Ac.) Muresan – 3 Lot S.P. 16 WESI© PROJECT:18-1751-A Proposed Site On-Site Hardscape Area: Existing SFR Roof = 1,900 sf. ± Ex. Walk/Patio to Remain = 800 sf. ± Ex. Pond to Remain = 260 sf. ± New Private Road = 1,600 sf. *Future Lot 1 House Roof = 3,900 sf. New Lot 1 Driveway Pad = 750 sf. *New Lot 2 Addition Roof = 1,400 sf. *Future Lot 2 Acc. Roof = 1,000 sf. New Lot 2 Driveway = 2,200 sf. Future Lot 2 Acc. Driveway = 600 sf. *Future Lot 3 House Roof = 3,900 sf. Future Lot 3 Driveway Pad = 750 sf. Total = 19,060 sf. (0.438 Ac.) *Roof area fully infiltrating via dry wells. On-Site Vegetated Area: Proposed Lawn = 10,628 sf. (0.245 Ac.) Existing Native Veg. Remain = 12,900 sf. (0.296 Ac.) Off-Site Hardscape Area: 70th Avenue West Widening = 700 sf. Private Road Entrance = 400 sf. Total = 1,100 sf. (0.025 Ac) Off-Site Vegetated Area: Graded Landscaping Adjacent to Road = 2,100 sf. (0.048 Ac.) New/Replaced Impervious Surface = 17,200 sf. Effective New/Replaced Surface = 1,100 sf. LEGEND DRAINAGE AREA EXHIBIT MAP Muresan – 3 Lot S.P. 18 WESI© PROJECT:18-1751-A RUNOFF CALCULATIONS (CONCEPTUAL ROAD/DRIVEWAY BIORETENTION & ROOF INFILTRATION AREAS INCLUDED) Muresan – 3 Lot S.P. 19 WESI© PROJECT:18-1751-A WWHM BMP LAYOUT DEVELOPED CONDITION Muresan – 3 Lot S.P. 20 WESI© PROJECT:18-1751-A WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: Total Site_NO FOREST RETENTION 05-18-21 Site Name: Site Address: City : Report Date: 5/20/2021 Gage : Everett Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 (1 HOUR TIME STEP) ___________________________________________________________________ Low Flow Threshold for POC 1 : 50 Percent of the 2 Year ___________________________________________________________________ High Flow Threshold for POC 1: 50 year ___________________________________________________________________ PREDEVELOPED LAND USE Name : PREDEV Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat 0.069 (PRE-DEVELOPED SITE, FLAT) C, Forest, Mod 0.842 (*PRE-DEVELOPED SITE, MODERATE) C, Forest, Steep 0.129 (*PRE-DEVELOPED SITE, STEEP) Pervious Total 1.040 Impervious Land Use acre Impervious Total 0 Basin Total 1.040 ___________________________________________________________________ MITIGATED LAND USE Name : DEV SITE Bypass: Yes GroundWater: No Pervious Land Use acre C, Lawn, Mod 0.518 (PROPOSED LAWN AND VEG RETENTION, MOD) C, Lawn, Steep 0.023 (PROPOSED LAWN AND VEG RETENTION, STEEP) Pervious Total 0.541 Muresan – 3 Lot S.P. 21 WESI© PROJECT:18-1751-A Impervious Land Use acre ROOF TOPS FLAT 0.027 (EXISTING NON-RETROFIT ROOF) SIDEWALKS FLAT 0.024 (EXISTING PATIOS/WALKS TO REMAIN) Impervious Total 0.051 Basin Total 0.592 ___________________________________________________________________ Name : FRONTAGE BYPASS Bypass: Yes GroundWater: No Pervious Land Use acre C, Lawn, Mod 0.046 (R.O.W. ADJACENT LANDSCAPING) Pervious Total 0.046 Impervious Land Use acre ROADS MOD 0.023 (FRONTAGE WIDENING AND ROAD ACCESS) Impervious Total 0.023 Basin Total 0.069 ___________________________________________________________________ Name : PVT ROAD - PTN LOT 2 DWY AND LOT 3 ROOF-DWY Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROADS MOD 0.080 (ON-SITE PVT ROAD AND PTN LOT 2 DRIVE) ROOF TOPS FLAT 0.090 (CONCEPTUAL LOT 3 ROOF AREA) DRIVEWAYS FLAT 0.017 (CONCEPTUAL LOT 3 DRIVEWAY AREA) Impervious Total 0.187 Basin Total 0.187 Element Flows To: Surface Interflow Groundwater Surface COMMON BIO Surface COMMON BIO ___________________________________________________________________ Name : COMMON BIO Bottom Length: 23.00 ft. Bottom Width: 10.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Muresan – 3 Lot S.P. 22 WESI© PROJECT:18-1751-A Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 22.506 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 22.506 Percent Infiltrated: 100 Total Precip Applied to Facility: 0.881 Total Evap From Facility: 0.615 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ COMMON BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.0140 0.0000 0.0000 0.0000 0.0275 0.0138 0.0000 0.0000 0.0000 0.0549 0.0137 0.0001 0.0000 0.0000 0.0824 0.0135 0.0001 0.0000 0.0000 0.1099 0.0133 0.0001 0.0000 0.0000 0.1374 0.0131 0.0002 0.0000 0.0000 0.1648 0.0129 0.0002 0.0000 0.0003 0.1923 0.0127 0.0003 0.0000 0.0004 0.2198 0.0125 0.0003 0.0000 0.0006 0.2473 0.0123 0.0003 0.0000 0.0008 0.2747 0.0122 0.0004 0.0000 0.0010 0.3022 0.0120 0.0004 0.0000 0.0012 0.3297 0.0118 0.0005 0.0000 0.0015 0.3571 0.0116 0.0005 0.0000 0.0019 0.3846 0.0114 0.0005 0.0000 0.0022 0.4121 0.0113 0.0006 0.0000 0.0026 0.4396 0.0111 0.0006 0.0000 0.0031 0.4670 0.0109 0.0007 0.0000 0.0036 0.4945 0.0108 0.0007 0.0000 0.0041 0.5220 0.0106 0.0008 0.0000 0.0047 0.5495 0.0104 0.0008 0.0000 0.0053 0.5769 0.0102 0.0009 0.0000 0.0060 0.6044 0.0101 0.0009 0.0000 0.0067 0.6319 0.0099 0.0010 0.0000 0.0075 0.6593 0.0098 0.0010 0.0000 0.0083 0.6868 0.0096 0.0011 0.0000 0.0092 0.7143 0.0094 0.0012 0.0000 0.0101 0.7418 0.0093 0.0012 0.0000 0.0111 0.7692 0.0091 0.0013 0.0000 0.0122 0.7967 0.0089 0.0013 0.0000 0.0133 0.8242 0.0088 0.0014 0.0000 0.0144 0.8516 0.0086 0.0014 0.0000 0.0156 0.8791 0.0085 0.0015 0.0000 0.0169 0.9066 0.0083 0.0016 0.0000 0.0182 Muresan – 3 Lot S.P. 23 WESI© PROJECT:18-1751-A 0.9341 0.0082 0.0016 0.0000 0.0196 0.9615 0.0080 0.0017 0.0000 0.0211 0.9890 0.0079 0.0018 0.0000 0.0226 1.0165 0.0077 0.0018 0.0000 0.0242 1.0440 0.0076 0.0019 0.0000 0.0259 1.0714 0.0074 0.0020 0.0000 0.0259 1.0989 0.0073 0.0020 0.0000 0.0259 1.1264 0.0072 0.0021 0.0000 0.0259 1.1538 0.0070 0.0023 0.0000 0.0259 1.1813 0.0069 0.0024 0.0000 0.0259 1.2088 0.0067 0.0026 0.0000 0.0259 1.2363 0.0066 0.0027 0.0000 0.0259 1.2637 0.0065 0.0029 0.0000 0.0259 1.2912 0.0063 0.0030 0.0000 0.0259 1.3187 0.0062 0.0032 0.0000 0.0259 1.3462 0.0061 0.0033 0.0000 0.0259 1.3736 0.0059 0.0035 0.0000 0.0259 1.4011 0.0058 0.0037 0.0000 0.0259 1.4286 0.0057 0.0038 0.0000 0.0259 1.4560 0.0055 0.0040 0.0000 0.0259 1.4835 0.0054 0.0042 0.0000 0.0259 1.5000 0.0053 0.0043 0.0000 0.0259 Surface COMMON BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.0140 0.0043 0.0000 0.0639 0.0000 1.5275 0.0142 0.0047 0.0000 0.0639 0.0000 1.5549 0.0143 0.0051 0.0000 0.0662 0.0000 1.5824 0.0145 0.0055 0.0000 0.0674 0.0000 1.6099 0.0147 0.0059 0.0000 0.0686 0.0000 1.6374 0.0149 0.0063 0.0000 0.0697 0.0000 1.6648 0.0151 0.0067 0.0000 0.0709 0.0000 1.6923 0.0153 0.0071 0.0000 0.0721 0.0000 1.7198 0.0155 0.0075 0.0000 0.0732 0.0000 1.7473 0.0157 0.0079 0.0000 0.0744 0.0000 1.7747 0.0160 0.0084 0.0000 0.0756 0.0000 1.8022 0.0162 0.0088 0.0000 0.0768 0.0000 1.8297 0.0164 0.0093 0.0000 0.0779 0.0000 1.8571 0.0166 0.0097 0.0000 0.0791 0.0000 1.8846 0.0168 0.0102 0.0000 0.0803 0.0000 1.9121 0.0170 0.0106 0.0000 0.0814 0.0000 1.9396 0.0172 0.0111 0.0000 0.0826 0.0000 1.9670 0.0174 0.0116 0.0000 0.0838 0.0000 1.9945 0.0176 0.0121 0.0000 0.0850 0.0000 2.0220 0.0178 0.0126 0.0173 0.0852 0.0000 2.0495 0.0181 0.0131 0.0580 0.0852 0.0000 2.0769 0.0183 0.0136 0.1109 0.0852 0.0000 2.1044 0.0185 0.0141 0.1701 0.0852 0.0000 2.1319 0.0187 0.0146 0.2299 0.0852 0.0000 2.1593 0.0189 0.0151 0.2845 0.0852 0.0000 2.1868 0.0192 0.0156 0.3293 0.0852 0.0000 2.2143 0.0194 0.0161 0.3619 0.0852 0.0000 2.2418 0.0196 0.0167 0.3840 0.0852 0.0000 2.2692 0.0199 0.0172 0.4086 0.0852 0.0000 2.2967 0.0201 0.0178 0.4289 0.0852 0.0000 2.3242 0.0203 0.0183 0.4483 0.0852 0.0000 2.3516 0.0205 0.0189 0.4669 0.0852 0.0000 Muresan – 3 Lot S.P. 24 WESI© PROJECT:18-1751-A 2.3791 0.0208 0.0194 0.4848 0.0852 0.0000 2.4066 0.0210 0.0200 0.5021 0.0852 0.0000 2.4341 0.0212 0.0206 0.5188 0.0852 0.0000 2.4615 0.0215 0.0212 0.5349 0.0852 0.0000 2.4890 0.0217 0.0218 0.5506 0.0852 0.0000 2.5000 0.0218 0.0220 0.5659 0.0852 0.0000 ___________________________________________________________________ Name : Surface COMMON BIO Element Flows To: Outlet 1 Outlet 2 COMMON BIO ___________________________________________________________________ Name : LOT 2 DWY Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS FLAT 0.021 (PTN LOT 2 DRIVEWAY TO BIO) Impervious Total 0.021 Basin Total 0.021 Element Flows To: Surface Interflow Groundwater Surface OT 2 DWY BIO Surface OT 2 DWY BIO ___________________________________________________________________ Name : LOT 2 DWY BIO Bottom Length: 7.50 ft. Bottom Width: 2.50 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 2.531 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 2.531 Percent Infiltrated: 100 Total Precip Applied to Facility: 0.186 Total Evap From Facility: 0.115 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Muresan – 3 Lot S.P. 25 WESI© PROJECT:18-1751-A Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ LOT 2 DWY BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.004356 0.000000 0.0000 0.0000 0.0275 0.004293 0.000003 0.0000 0.0000 0.0549 0.004188 0.000006 0.0000 0.0000 0.0824 0.004085 0.000009 0.0000 0.0000 0.1099 0.003983 0.000013 0.0000 0.0000 0.1374 0.003882 0.000017 0.0000 0.0000 0.1648 0.003782 0.000025 0.0000 0.0000 0.1923 0.003684 0.000034 0.0000 0.0000 0.2198 0.003587 0.000043 0.0000 0.0000 0.2473 0.003491 0.000053 0.0001 0.0001 0.2747 0.003396 0.000064 0.0001 0.0001 0.3022 0.003303 0.000075 0.0001 0.0001 0.3297 0.003211 0.000087 0.0001 0.0001 0.3571 0.003120 0.000100 0.0002 0.0002 0.3846 0.003030 0.000113 0.0002 0.0002 0.4121 0.002942 0.000127 0.0002 0.0002 0.4396 0.002855 0.000141 0.0003 0.0003 0.4670 0.002769 0.000157 0.0003 0.0003 0.4945 0.002684 0.000173 0.0003 0.0003 0.5220 0.002601 0.000190 0.0004 0.0004 0.5495 0.002519 0.000208 0.0004 0.0004 0.5769 0.002438 0.000226 0.0005 0.0005 0.6044 0.002358 0.000245 0.0005 0.0005 0.6319 0.002280 0.000265 0.0006 0.0006 0.6593 0.002203 0.000286 0.0007 0.0007 0.6868 0.002127 0.000308 0.0007 0.0007 0.7143 0.002052 0.000331 0.0008 0.0008 0.7418 0.001979 0.000354 0.0009 0.0009 0.7692 0.001907 0.000378 0.0010 0.0010 0.7967 0.001836 0.000404 0.0011 0.0011 0.8242 0.001766 0.000430 0.0012 0.0012 0.8516 0.001698 0.000457 0.0013 0.0013 0.8791 0.001631 0.000485 0.0014 0.0014 0.9066 0.001565 0.000515 0.0015 0.0015 0.9341 0.001500 0.000545 0.0016 0.0016 0.9615 0.001437 0.000576 0.0017 0.0017 0.9890 0.001375 0.000608 0.0018 0.0018 1.0165 0.001314 0.000641 0.0020 0.0020 1.0440 0.001254 0.000675 0.0021 0.0021 1.0714 0.001196 0.000711 0.0021 0.0021 1.0989 0.001138 0.000747 0.0021 0.0021 1.1264 0.001082 0.000785 0.0021 0.0021 1.1538 0.001028 0.000823 0.0021 0.0021 1.1813 0.000974 0.000863 0.0021 0.0021 1.2088 0.000922 0.000904 0.0021 0.0021 1.2363 0.000871 0.000946 0.0021 0.0021 1.2637 0.000822 0.000989 0.0021 0.0021 1.2912 0.000773 0.001034 0.0021 0.0021 1.3187 0.000726 0.001080 0.0021 0.0021 Muresan – 3 Lot S.P. 26 WESI© PROJECT:18-1751-A 1.3462 0.000680 0.001126 0.0021 0.0021 1.3736 0.000635 0.001175 0.0021 0.0021 1.4011 0.000592 0.001224 0.0021 0.0021 1.4286 0.000550 0.001275 0.0021 0.0021 1.4560 0.000509 0.001327 0.0021 0.0021 1.4835 0.000469 0.001380 0.0021 0.0021 1.5000 0.000430 0.001412 0.0021 0.0021 Surface OT 2 DWY BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.004356 0.001412 0.0000 0.0052 0.0000 1.5275 0.004463 0.001534 0.0000 0.0052 0.0000 1.5549 0.004570 0.001658 0.0000 0.0054 0.0000 1.5824 0.004680 0.001785 0.0000 0.0055 0.0000 1.6099 0.004790 0.001915 0.0000 0.0056 0.0000 1.6374 0.004901 0.002048 0.0000 0.0057 0.0000 1.6648 0.005014 0.002184 0.0000 0.0058 0.0000 1.6923 0.005128 0.002323 0.0000 0.0059 0.0000 1.7198 0.005244 0.002466 0.0000 0.0060 0.0000 1.7473 0.005360 0.002612 0.0000 0.0061 0.0000 1.7747 0.005478 0.002760 0.0000 0.0062 0.0000 1.8022 0.005597 0.002913 0.0000 0.0063 0.0000 1.8297 0.005717 0.003068 0.0000 0.0064 0.0000 1.8571 0.005839 0.003227 0.0000 0.0064 0.0000 1.8846 0.005962 0.003389 0.0000 0.0065 0.0000 1.9121 0.006086 0.003554 0.0000 0.0066 0.0000 1.9396 0.006211 0.003723 0.0000 0.0067 0.0000 1.9670 0.006338 0.003896 0.0000 0.0068 0.0000 1.9945 0.006465 0.004071 0.0000 0.0069 0.0000 2.0220 0.006594 0.004251 0.0000 0.0069 0.0000 2.0495 0.006725 0.004434 0.0000 0.0069 0.0000 2.0769 0.006856 0.004620 0.0000 0.0069 0.0000 2.1044 0.006989 0.004811 0.0000 0.0069 0.0000 2.1319 0.007123 0.005004 0.0000 0.0069 0.0000 2.1593 0.007258 0.005202 0.0000 0.0069 0.0000 2.1868 0.007395 0.005403 0.0000 0.0069 0.0000 2.2143 0.007533 0.005608 0.0000 0.0069 0.0000 2.2418 0.007672 0.005817 0.0000 0.0069 0.0000 2.2692 0.007812 0.006030 0.0000 0.0069 0.0000 2.2967 0.007953 0.006246 0.0000 0.0069 0.0000 2.3242 0.008096 0.006467 0.0000 0.0069 0.0000 2.3516 0.008240 0.006691 0.0000 0.0069 0.0000 2.3791 0.008385 0.006920 0.0000 0.0069 0.0000 2.4066 0.008532 0.007152 0.0000 0.0069 0.0000 2.4341 0.008680 0.007388 0.0000 0.0069 0.0000 2.4615 0.008829 0.007629 0.0000 0.0069 0.0000 2.4890 0.008979 0.007873 0.0000 0.0069 0.0000 2.5000 0.009039 0.007972 0.0000 0.0069 0.0000 ___________________________________________________________________ Name : Surface OT 2 DWY BIO Element Flows To: Outlet 1 Outlet 2 LOT 2 DWY BIO ___________________________________________________________________ Muresan – 3 Lot S.P. 27 WESI© PROJECT:18-1751-A Name : LOT 2 DWY PAD Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS FLAT 0.005 (PTN LOT 2 DRIVEWAY TO BIO) Impervious Total 0.005 Basin Total 0.005 Element Flows To: Surface Interflow Groundwater Surface DWY PAD BIO Surface DWY PAD BIO ___________________________________________________________________ Name : LOT 2 DWY PAD BIO Bottom Length: 2.50 ft. Bottom Width: 2.50 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 0.617 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 0.617 Percent Infiltrated: 100 Total Precip Applied to Facility: 0.107 Total Evap From Facility: 0.071 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ LOT 2 DWY PAD BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.003036 0.000000 0.0000 0.0000 0.0275 0.002984 0.000001 0.0000 0.0000 0.0549 0.002898 0.000003 0.0000 0.0000 0.0824 0.002814 0.000006 0.0000 0.0000 0.1099 0.002731 0.000008 0.0000 0.0000 0.1374 0.002649 0.000011 0.0000 0.0000 0.1648 0.002568 0.000015 0.0000 0.0000 Muresan – 3 Lot S.P. 28 WESI© PROJECT:18-1751-A 0.1923 0.002489 0.000018 0.0000 0.0000 0.2198 0.002411 0.000022 0.0000 0.0000 0.2473 0.002334 0.000027 0.0000 0.0000 0.2747 0.002258 0.000032 0.0000 0.0000 0.3022 0.002184 0.000037 0.0000 0.0000 0.3297 0.002110 0.000042 0.0000 0.0000 0.3571 0.002038 0.000048 0.0001 0.0001 0.3846 0.001968 0.000055 0.0001 0.0001 0.4121 0.001898 0.000062 0.0001 0.0001 0.4396 0.001830 0.000069 0.0001 0.0001 0.4670 0.001763 0.000077 0.0001 0.0001 0.4945 0.001697 0.000085 0.0001 0.0001 0.5220 0.001633 0.000094 0.0001 0.0001 0.5495 0.001570 0.000104 0.0001 0.0001 0.5769 0.001508 0.000114 0.0002 0.0002 0.6044 0.001447 0.000124 0.0002 0.0002 0.6319 0.001388 0.000135 0.0002 0.0002 0.6593 0.001329 0.000147 0.0002 0.0002 0.6868 0.001272 0.000159 0.0002 0.0002 0.7143 0.001217 0.000172 0.0003 0.0003 0.7418 0.001162 0.000186 0.0003 0.0003 0.7692 0.001109 0.000200 0.0003 0.0003 0.7967 0.001057 0.000215 0.0004 0.0004 0.8242 0.001006 0.000231 0.0004 0.0004 0.8516 0.000957 0.000247 0.0004 0.0004 0.8791 0.000909 0.000264 0.0005 0.0005 0.9066 0.000862 0.000282 0.0005 0.0005 0.9341 0.000816 0.000300 0.0005 0.0005 0.9615 0.000771 0.000320 0.0006 0.0006 0.9890 0.000728 0.000340 0.0006 0.0006 1.0165 0.000686 0.000361 0.0007 0.0007 1.0440 0.000645 0.000383 0.0007 0.0007 1.0714 0.000606 0.000405 0.0007 0.0007 1.0989 0.000568 0.000429 0.0007 0.0007 1.1264 0.000531 0.000453 0.0007 0.0007 1.1538 0.000495 0.000478 0.0007 0.0007 1.1813 0.000460 0.000504 0.0007 0.0007 1.2088 0.000427 0.000531 0.0007 0.0007 1.2363 0.000395 0.000559 0.0007 0.0007 1.2637 0.000364 0.000588 0.0007 0.0007 1.2912 0.000335 0.000618 0.0007 0.0007 1.3187 0.000306 0.000648 0.0007 0.0007 1.3462 0.000279 0.000680 0.0007 0.0007 1.3736 0.000254 0.000713 0.0007 0.0007 1.4011 0.000229 0.000747 0.0007 0.0007 1.4286 0.000206 0.000781 0.0007 0.0007 1.4560 0.000184 0.000817 0.0007 0.0007 1.4835 0.000163 0.000854 0.0007 0.0007 1.5000 0.000143 0.000877 0.0007 0.0007 Surface DWY PAD BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.003036 0.000877 0.0000 0.0017 0.0000 1.5275 0.003124 0.000962 0.0000 0.0017 0.0000 1.5549 0.003213 0.001049 0.0000 0.0018 0.0000 1.5824 0.003303 0.001138 0.0000 0.0018 0.0000 1.6099 0.003394 0.001230 0.0000 0.0019 0.0000 Muresan – 3 Lot S.P. 29 WESI© PROJECT:18-1751-A 1.6374 0.003487 0.001325 0.0000 0.0019 0.0000 1.6648 0.003581 0.001422 0.0000 0.0019 0.0000 1.6923 0.003676 0.001521 0.0000 0.0020 0.0000 1.7198 0.003772 0.001624 0.0000 0.0020 0.0000 1.7473 0.003870 0.001729 0.0000 0.0020 0.0000 1.7747 0.003969 0.001836 0.0000 0.0021 0.0000 1.8022 0.004069 0.001947 0.0000 0.0021 0.0000 1.8297 0.004170 0.002060 0.0000 0.0021 0.0000 1.8571 0.004273 0.002176 0.0000 0.0021 0.0000 1.8846 0.004377 0.002295 0.0000 0.0022 0.0000 1.9121 0.004482 0.002416 0.0000 0.0022 0.0000 1.9396 0.004588 0.002541 0.0000 0.0022 0.0000 1.9670 0.004696 0.002669 0.0000 0.0023 0.0000 1.9945 0.004805 0.002799 0.0000 0.0023 0.0000 2.0220 0.004915 0.002933 0.0000 0.0023 0.0000 2.0495 0.005026 0.003069 0.0000 0.0023 0.0000 2.0769 0.005139 0.003209 0.0000 0.0023 0.0000 2.1044 0.005253 0.003352 0.0000 0.0023 0.0000 2.1319 0.005368 0.003497 0.0000 0.0023 0.0000 2.1593 0.005484 0.003646 0.0000 0.0023 0.0000 2.1868 0.005602 0.003799 0.0000 0.0023 0.0000 2.2143 0.005721 0.003954 0.0000 0.0023 0.0000 2.2418 0.005841 0.004113 0.0000 0.0023 0.0000 2.2692 0.005962 0.004275 0.0000 0.0023 0.0000 2.2967 0.006085 0.004441 0.0000 0.0023 0.0000 2.3242 0.006208 0.004610 0.0000 0.0023 0.0000 2.3516 0.006334 0.004782 0.0000 0.0023 0.0000 2.3791 0.006460 0.004958 0.0000 0.0023 0.0000 2.4066 0.006587 0.005137 0.0000 0.0023 0.0000 2.4341 0.006716 0.005320 0.0000 0.0023 0.0000 2.4615 0.006846 0.005506 0.0000 0.0023 0.0000 2.4890 0.006978 0.005696 0.0000 0.0023 0.0000 2.5000 0.007031 0.005773 0.0000 0.0023 0.0000 ___________________________________________________________________ Name : Surface DWY PAD BIO Element Flows To: Outlet 1 Outlet 2 LOT 2 DWY PAD BIO ___________________________________________________________________ Name : LOT 1 DWY Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS FLAT 0.017 (CONCEPTUAL LOT 1 DRIVEWAY PAD) Impervious Total 0.017 Basin Total 0.017 Muresan – 3 Lot S.P. 30 WESI© PROJECT:18-1751-A Element Flows To: Surface Interflow Groundwater Surface OT 1 DWY BIO Surface OT 1 DWY BIO ___________________________________________________________________ Name : LOT 1 DWY BIO Bottom Length: 5.50 ft. Bottom Width: 2.50 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 0 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 2.059 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 2.059 Percent Infiltrated: 100 Total Precip Applied to Facility: 0.168 Total Evap From Facility: 0.099 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ LOT 1 DWY BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.003828 0.000000 0.0000 0.0000 0.0275 0.003769 0.000002 0.0000 0.0000 0.0549 0.003672 0.000004 0.0000 0.0000 0.0824 0.003576 0.000007 0.0000 0.0000 0.1099 0.003482 0.000010 0.0000 0.0000 0.1374 0.003389 0.000015 0.0000 0.0000 0.1648 0.003297 0.000022 0.0000 0.0000 0.1923 0.003206 0.000028 0.0000 0.0000 0.2198 0.003116 0.000036 0.0000 0.0000 0.2473 0.003028 0.000043 0.0000 0.0000 0.2747 0.002941 0.000052 0.0001 0.0001 0.3022 0.002855 0.000061 0.0001 0.0001 0.3297 0.002771 0.000070 0.0001 0.0001 0.3571 0.002687 0.000080 0.0001 0.0001 0.3846 0.002605 0.000090 0.0001 0.0001 0.4121 0.002525 0.000102 0.0002 0.0002 0.4396 0.002445 0.000113 0.0002 0.0002 0.4670 0.002367 0.000126 0.0002 0.0002 0.4945 0.002290 0.000139 0.0002 0.0002 0.5220 0.002214 0.000152 0.0003 0.0003 0.5495 0.002139 0.000167 0.0003 0.0003 0.5769 0.002066 0.000182 0.0004 0.0004 Muresan – 3 Lot S.P. 31 WESI© PROJECT:18-1751-A 0.6044 0.001994 0.000198 0.0004 0.0004 0.6319 0.001923 0.000214 0.0004 0.0004 0.6593 0.001854 0.000231 0.0005 0.0005 0.6868 0.001785 0.000249 0.0005 0.0005 0.7143 0.001718 0.000268 0.0006 0.0006 0.7418 0.001652 0.000288 0.0007 0.0007 0.7692 0.001588 0.000308 0.0007 0.0007 0.7967 0.001524 0.000329 0.0008 0.0008 0.8242 0.001462 0.000351 0.0009 0.0009 0.8516 0.001401 0.000374 0.0009 0.0009 0.8791 0.001342 0.000398 0.0010 0.0010 0.9066 0.001284 0.000422 0.0011 0.0011 0.9341 0.001226 0.000448 0.0012 0.0012 0.9615 0.001171 0.000474 0.0013 0.0013 0.9890 0.001116 0.000502 0.0014 0.0014 1.0165 0.001063 0.000530 0.0014 0.0014 1.0440 0.001011 0.000559 0.0015 0.0015 1.0714 0.000960 0.000589 0.0015 0.0015 1.0989 0.000910 0.000621 0.0015 0.0015 1.1264 0.000862 0.000653 0.0015 0.0015 1.1538 0.000815 0.000686 0.0015 0.0015 1.1813 0.000769 0.000720 0.0015 0.0015 1.2088 0.000724 0.000756 0.0015 0.0015 1.2363 0.000681 0.000792 0.0015 0.0015 1.2637 0.000639 0.000830 0.0015 0.0015 1.2912 0.000598 0.000868 0.0015 0.0015 1.3187 0.000558 0.000908 0.0015 0.0015 1.3462 0.000520 0.000949 0.0015 0.0015 1.3736 0.000483 0.000991 0.0015 0.0015 1.4011 0.000447 0.001034 0.0015 0.0015 1.4286 0.000412 0.001078 0.0015 0.0015 1.4560 0.000379 0.001124 0.0015 0.0015 1.4835 0.000347 0.001170 0.0015 0.0015 1.5000 0.000316 0.001199 0.0015 0.0015 Surface OT 1 DWY BIO Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.003828 0.001199 0.0000 0.0038 0.0000 1.5275 0.003927 0.001306 0.0000 0.0038 0.0000 1.5549 0.004027 0.001415 0.0000 0.0040 0.0000 1.5824 0.004129 0.001527 0.0000 0.0040 0.0000 1.6099 0.004232 0.001642 0.0000 0.0041 0.0000 1.6374 0.004336 0.001759 0.0000 0.0042 0.0000 1.6648 0.004441 0.001880 0.0000 0.0042 0.0000 1.6923 0.004547 0.002003 0.0000 0.0043 0.0000 1.7198 0.004655 0.002130 0.0000 0.0044 0.0000 1.7473 0.004764 0.002259 0.0000 0.0044 0.0000 1.7747 0.004874 0.002392 0.0000 0.0045 0.0000 1.8022 0.004986 0.002527 0.0000 0.0046 0.0000 1.8297 0.005099 0.002666 0.0000 0.0047 0.0000 1.8571 0.005212 0.002807 0.0000 0.0047 0.0000 1.8846 0.005328 0.002952 0.0000 0.0048 0.0000 1.9121 0.005444 0.003100 0.0000 0.0049 0.0000 1.9396 0.005562 0.003251 0.0000 0.0049 0.0000 1.9670 0.005681 0.003406 0.0000 0.0050 0.0000 1.9945 0.005801 0.003563 0.0000 0.0051 0.0000 2.0220 0.005923 0.003724 0.0000 0.0051 0.0000 Muresan – 3 Lot S.P. 32 WESI© PROJECT:18-1751-A 2.0495 0.006045 0.003889 0.0000 0.0051 0.0000 2.0769 0.006169 0.004057 0.0000 0.0051 0.0000 2.1044 0.006294 0.004228 0.0000 0.0051 0.0000 2.1319 0.006421 0.004402 0.0000 0.0051 0.0000 2.1593 0.006549 0.004581 0.0000 0.0051 0.0000 2.1868 0.006678 0.004762 0.0000 0.0051 0.0000 2.2143 0.006808 0.004948 0.0000 0.0051 0.0000 2.2418 0.006939 0.005136 0.0000 0.0051 0.0000 2.2692 0.007072 0.005329 0.0000 0.0051 0.0000 2.2967 0.007206 0.005525 0.0000 0.0051 0.0000 2.3242 0.007341 0.005725 0.0000 0.0051 0.0000 2.3516 0.007477 0.005928 0.0000 0.0051 0.0000 2.3791 0.007615 0.006136 0.0000 0.0051 0.0000 2.4066 0.007754 0.006347 0.0000 0.0051 0.0000 2.4341 0.007894 0.006562 0.0000 0.0051 0.0000 2.4615 0.008036 0.006780 0.0000 0.0051 0.0000 2.4890 0.008178 0.007003 0.0000 0.0051 0.0000 2.5000 0.008236 0.007093 0.0000 0.0051 0.0000 ___________________________________________________________________ Name : Surface OT 1 DWY BIO Element Flows To: Outlet 1 Outlet 2 LOT 1 DWY BIO ___________________________________________________________________ Name : LOT 1 ROOF Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.09 (CONCEPTUAL LOT 1 ROOF) Impervious Total 0.09 Basin Total 0.09 Element Flows To: Surface Interflow Groundwater LOT 1 ROOF DRYWELL LOT 1 ROOF DRYWELL ___________________________________________________________________ Name : LOT 1 ROOF DRYWELL Bottom Length: 10.50 ft. Bottom Width: 10.50 ft. Trench bottom slope 1: 0 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 5 Pour Space of material for first layer: 0.4 Material thickness of second layer: 0 Muresan – 3 Lot S.P. 33 WESI© PROJECT:18-1751-A Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 10.539 Total Volume Through Riser (ac-ft.): 0.001 Total Volume Through Facility (ac-ft.): 10.539 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.002 0.000 0.000 0.000 0.0567 0.002 0.000 0.000 0.012 0.1133 0.002 0.000 0.000 0.012 0.1700 0.002 0.000 0.000 0.012 0.2267 0.002 0.000 0.000 0.012 0.2833 0.002 0.000 0.000 0.012 0.3400 0.002 0.000 0.000 0.012 0.3967 0.002 0.000 0.000 0.012 0.4533 0.002 0.000 0.000 0.012 0.5100 0.002 0.000 0.000 0.012 0.5667 0.002 0.000 0.000 0.012 0.6233 0.002 0.000 0.000 0.012 0.6800 0.002 0.000 0.000 0.012 0.7367 0.002 0.000 0.000 0.012 0.7933 0.002 0.000 0.000 0.012 0.8500 0.002 0.000 0.000 0.012 0.9067 0.002 0.000 0.000 0.012 0.9633 0.002 0.001 0.000 0.012 1.0200 0.002 0.001 0.000 0.012 1.0767 0.002 0.001 0.000 0.012 1.1333 0.002 0.001 0.000 0.012 1.1900 0.002 0.001 0.000 0.012 1.2467 0.002 0.001 0.000 0.012 1.3033 0.002 0.001 0.000 0.012 1.3600 0.002 0.001 0.000 0.012 1.4167 0.002 0.001 0.000 0.012 1.4733 0.002 0.001 0.000 0.012 1.5300 0.002 0.001 0.000 0.012 1.5867 0.002 0.001 0.000 0.012 1.6433 0.002 0.001 0.000 0.012 1.7000 0.002 0.001 0.000 0.012 1.7567 0.002 0.001 0.000 0.012 1.8133 0.002 0.001 0.000 0.012 1.8700 0.002 0.001 0.000 0.012 1.9267 0.002 0.002 0.000 0.012 Muresan – 3 Lot S.P. 34 WESI© PROJECT:18-1751-A 1.9833 0.002 0.002 0.000 0.012 2.0400 0.002 0.002 0.000 0.012 2.0967 0.002 0.002 0.000 0.012 2.1533 0.002 0.002 0.000 0.012 2.2100 0.002 0.002 0.000 0.012 2.2667 0.002 0.002 0.000 0.012 2.3233 0.002 0.002 0.000 0.012 2.3800 0.002 0.002 0.000 0.012 2.4367 0.002 0.002 0.000 0.012 2.4933 0.002 0.002 0.000 0.012 2.5500 0.002 0.002 0.000 0.012 2.6067 0.002 0.002 0.000 0.012 2.6633 0.002 0.002 0.000 0.012 2.7200 0.002 0.002 0.000 0.012 2.7767 0.002 0.002 0.000 0.012 2.8333 0.002 0.002 0.000 0.012 2.8900 0.002 0.002 0.000 0.012 2.9467 0.002 0.003 0.000 0.012 3.0033 0.002 0.003 0.000 0.012 3.0600 0.002 0.003 0.000 0.012 3.1167 0.002 0.003 0.000 0.012 3.1733 0.002 0.003 0.000 0.012 3.2300 0.002 0.003 0.000 0.012 3.2867 0.002 0.003 0.000 0.012 3.3433 0.002 0.003 0.000 0.012 3.4000 0.002 0.003 0.000 0.012 3.4567 0.002 0.003 0.000 0.012 3.5133 0.002 0.003 0.000 0.012 3.5700 0.002 0.003 0.000 0.012 3.6267 0.002 0.003 0.000 0.012 3.6833 0.002 0.003 0.000 0.012 3.7400 0.002 0.003 0.000 0.012 3.7967 0.002 0.003 0.000 0.012 3.8533 0.002 0.003 0.000 0.012 3.9100 0.002 0.004 0.000 0.012 3.9667 0.002 0.004 0.000 0.012 4.0233 0.002 0.004 0.000 0.012 4.0800 0.002 0.004 0.000 0.012 4.1367 0.002 0.004 0.000 0.012 4.1933 0.002 0.004 0.000 0.012 4.2500 0.002 0.004 0.000 0.012 4.3067 0.002 0.004 0.000 0.012 4.3633 0.002 0.004 0.000 0.012 4.4200 0.002 0.004 0.000 0.012 4.4767 0.002 0.004 0.000 0.012 4.5333 0.002 0.004 0.000 0.012 4.5900 0.002 0.004 0.000 0.012 4.6467 0.002 0.004 0.000 0.012 4.7033 0.002 0.004 0.000 0.012 4.7600 0.002 0.004 0.000 0.012 4.8167 0.002 0.004 0.000 0.012 4.8733 0.002 0.004 0.000 0.012 4.9300 0.002 0.005 0.000 0.012 4.9867 0.002 0.005 0.000 0.012 5.0433 0.002 0.005 0.047 0.012 5.1000 0.002 0.005 0.160 0.012 ___________________________________________________________________ Muresan – 3 Lot S.P. 35 WESI© PROJECT:18-1751-A Name : LOT 2 ADDITION ROOF Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.032 (LOT 2 BUILDING ADDITION ROOF) Impervious Total 0.032 Basin Total 0.032 Element Flows To: Surface Interflow Groundwater LOT 2 ADDITION BIO LOT 2 ADDITION BIO ___________________________________________________________________ Name : LOT 2 ADDITION DRYWELL Bottom Length: 6.10 ft. Bottom Width: 6.00 ft. Trench bottom slope 1: 0 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 5 Pour Space of material for first layer: 0.4 Material thickness of second layer: 0 Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 3.698 Total Volume Through Riser (ac-ft.): 0.001 Total Volume Through Facility (ac-ft.): 3.698 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000840 0.000000 0.000 0.000 0.0567 0.000840 0.000019 0.000 0.004 0.1133 0.000840 0.000038 0.000 0.004 0.1700 0.000840 0.000057 0.000 0.004 Muresan – 3 Lot S.P. 36 WESI© PROJECT:18-1751-A 0.2267 0.000840 0.000076 0.000 0.004 0.2833 0.000840 0.000095 0.000 0.004 0.3400 0.000840 0.000114 0.000 0.004 0.3967 0.000840 0.000133 0.000 0.004 0.4533 0.000840 0.000152 0.000 0.004 0.5100 0.000840 0.000171 0.000 0.004 0.5667 0.000840 0.000190 0.000 0.004 0.6233 0.000840 0.000209 0.000 0.004 0.6800 0.000840 0.000229 0.000 0.004 0.7367 0.000840 0.000248 0.000 0.004 0.7933 0.000840 0.000267 0.000 0.004 0.8500 0.000840 0.000286 0.000 0.004 0.9067 0.000840 0.000305 0.000 0.004 0.9633 0.000840 0.000324 0.000 0.004 1.0200 0.000840 0.000343 0.000 0.004 1.0767 0.000840 0.000362 0.000 0.004 1.1333 0.000840 0.000381 0.000 0.004 1.1900 0.000840 0.000400 0.000 0.004 1.2467 0.000840 0.000419 0.000 0.004 1.3033 0.000840 0.000438 0.000 0.004 1.3600 0.000840 0.000457 0.000 0.004 1.4167 0.000840 0.000476 0.000 0.004 1.4733 0.000840 0.000495 0.000 0.004 1.5300 0.000840 0.000514 0.000 0.004 1.5867 0.000840 0.000533 0.000 0.004 1.6433 0.000840 0.000552 0.000 0.004 1.7000 0.000840 0.000571 0.000 0.004 1.7567 0.000840 0.000590 0.000 0.004 1.8133 0.000840 0.000609 0.000 0.004 1.8700 0.000840 0.000628 0.000 0.004 1.9267 0.000840 0.000648 0.000 0.004 1.9833 0.000840 0.000667 0.000 0.004 2.0400 0.000840 0.000686 0.000 0.004 2.0967 0.000840 0.000705 0.000 0.004 2.1533 0.000840 0.000724 0.000 0.004 2.2100 0.000840 0.000743 0.000 0.004 2.2667 0.000840 0.000762 0.000 0.004 2.3233 0.000840 0.000781 0.000 0.004 2.3800 0.000840 0.000800 0.000 0.004 2.4367 0.000840 0.000819 0.000 0.004 2.4933 0.000840 0.000838 0.000 0.004 2.5500 0.000840 0.000857 0.000 0.004 2.6067 0.000840 0.000876 0.000 0.004 2.6633 0.000840 0.000895 0.000 0.004 2.7200 0.000840 0.000914 0.000 0.004 2.7767 0.000840 0.000933 0.000 0.004 2.8333 0.000840 0.000952 0.000 0.004 2.8900 0.000840 0.000971 0.000 0.004 2.9467 0.000840 0.000990 0.000 0.004 3.0033 0.000840 0.001009 0.000 0.004 3.0600 0.000840 0.001028 0.000 0.004 3.1167 0.000840 0.001047 0.000 0.004 3.1733 0.000840 0.001067 0.000 0.004 3.2300 0.000840 0.001086 0.000 0.004 3.2867 0.000840 0.001105 0.000 0.004 3.3433 0.000840 0.001124 0.000 0.004 3.4000 0.000840 0.001143 0.000 0.004 Muresan – 3 Lot S.P. 37 WESI© PROJECT:18-1751-A 3.4567 0.000840 0.001162 0.000 0.004 3.5133 0.000840 0.001181 0.000 0.004 3.5700 0.000840 0.001200 0.000 0.004 3.6267 0.000840 0.001219 0.000 0.004 3.6833 0.000840 0.001238 0.000 0.004 3.7400 0.000840 0.001257 0.000 0.004 3.7967 0.000840 0.001276 0.000 0.004 3.8533 0.000840 0.001295 0.000 0.004 3.9100 0.000840 0.001314 0.000 0.004 3.9667 0.000840 0.001333 0.000 0.004 4.0233 0.000840 0.001352 0.000 0.004 4.0800 0.000840 0.001371 0.000 0.004 4.1367 0.000840 0.001390 0.000 0.004 4.1933 0.000840 0.001409 0.000 0.004 4.2500 0.000840 0.001428 0.000 0.004 4.3067 0.000840 0.001447 0.000 0.004 4.3633 0.000840 0.001466 0.000 0.004 4.4200 0.000840 0.001486 0.000 0.004 4.4767 0.000840 0.001505 0.000 0.004 4.5333 0.000840 0.001524 0.000 0.004 4.5900 0.000840 0.001543 0.000 0.004 4.6467 0.000840 0.001562 0.000 0.004 4.7033 0.000840 0.001581 0.000 0.004 4.7600 0.000840 0.001600 0.000 0.004 4.8167 0.000840 0.001619 0.000 0.004 4.8733 0.000840 0.001638 0.000 0.004 4.9300 0.000840 0.001657 0.000 0.004 4.9867 0.000840 0.001676 0.000 0.004 5.0433 0.000840 0.001724 0.047 0.004 5.1000 0.000840 0.001771 0.160 0.004 ___________________________________________________________________ Name : LOT 2 ACCESSORY ROOF Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.023 (CONCEPTUAL LOT 2 ACC. ROOF) Impervious Total 0.023 Basin Total 0.023 Element Flows To: Surface Interflow Groundwater LOT 2 ACCESSORY BIO LOT 2 ACCESSORY BIO ___________________________________________________________________ Name : LOT 2 ACCESSORY BIO Bottom Length: 5.00 ft. Bottom Width: 5.00 ft. Trench bottom slope 1: 0 To 1 Muresan – 3 Lot S.P. 38 WESI© PROJECT:18-1751-A Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 5 Pour Space of material for first layer: 0.4 Material thickness of second layer: 0 Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 2.637 Total Volume Through Riser (ac-ft.): 0.001 Total Volume Through Facility (ac-ft.): 2.637 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000574 0.000000 0.000 0.000 0.0567 0.000574 0.000013 0.000 0.002 0.1133 0.000574 0.000026 0.000 0.002 0.1700 0.000574 0.000039 0.000 0.002 0.2267 0.000574 0.000052 0.000 0.002 0.2833 0.000574 0.000065 0.000 0.002 0.3400 0.000574 0.000078 0.000 0.002 0.3967 0.000574 0.000091 0.000 0.002 0.4533 0.000574 0.000104 0.000 0.002 0.5100 0.000574 0.000117 0.000 0.002 0.5667 0.000574 0.000130 0.000 0.002 0.6233 0.000574 0.000143 0.000 0.002 0.6800 0.000574 0.000156 0.000 0.002 0.7367 0.000574 0.000169 0.000 0.002 0.7933 0.000574 0.000182 0.000 0.002 0.8500 0.000574 0.000195 0.000 0.002 0.9067 0.000574 0.000208 0.000 0.002 0.9633 0.000574 0.000221 0.000 0.002 1.0200 0.000574 0.000234 0.000 0.002 1.0767 0.000574 0.000247 0.000 0.002 1.1333 0.000574 0.000260 0.000 0.002 1.1900 0.000574 0.000273 0.000 0.002 1.2467 0.000574 0.000286 0.000 0.002 1.3033 0.000574 0.000299 0.000 0.002 1.3600 0.000574 0.000312 0.000 0.002 1.4167 0.000574 0.000325 0.000 0.002 1.4733 0.000574 0.000338 0.000 0.002 1.5300 0.000574 0.000351 0.000 0.002 1.5867 0.000574 0.000364 0.000 0.002 1.6433 0.000574 0.000377 0.000 0.002 Muresan – 3 Lot S.P. 39 WESI© PROJECT:18-1751-A 1.7000 0.000574 0.000390 0.000 0.002 1.7567 0.000574 0.000403 0.000 0.002 1.8133 0.000574 0.000416 0.000 0.002 1.8700 0.000574 0.000429 0.000 0.002 1.9267 0.000574 0.000442 0.000 0.002 1.9833 0.000574 0.000455 0.000 0.002 2.0400 0.000574 0.000468 0.000 0.002 2.0967 0.000574 0.000481 0.000 0.002 2.1533 0.000574 0.000494 0.000 0.002 2.2100 0.000574 0.000507 0.000 0.002 2.2667 0.000574 0.000520 0.000 0.002 2.3233 0.000574 0.000533 0.000 0.002 2.3800 0.000574 0.000546 0.000 0.002 2.4367 0.000574 0.000559 0.000 0.002 2.4933 0.000574 0.000572 0.000 0.002 2.5500 0.000574 0.000585 0.000 0.002 2.6067 0.000574 0.000598 0.000 0.002 2.6633 0.000574 0.000611 0.000 0.002 2.7200 0.000574 0.000624 0.000 0.002 2.7767 0.000574 0.000637 0.000 0.002 2.8333 0.000574 0.000650 0.000 0.002 2.8900 0.000574 0.000663 0.000 0.002 2.9467 0.000574 0.000676 0.000 0.002 3.0033 0.000574 0.000689 0.000 0.002 3.0600 0.000574 0.000702 0.000 0.002 3.1167 0.000574 0.000715 0.000 0.002 3.1733 0.000574 0.000728 0.000 0.002 3.2300 0.000574 0.000742 0.000 0.002 3.2867 0.000574 0.000755 0.000 0.002 3.3433 0.000574 0.000768 0.000 0.002 3.4000 0.000574 0.000781 0.000 0.002 3.4567 0.000574 0.000794 0.000 0.002 3.5133 0.000574 0.000807 0.000 0.002 3.5700 0.000574 0.000820 0.000 0.002 3.6267 0.000574 0.000833 0.000 0.002 3.6833 0.000574 0.000846 0.000 0.002 3.7400 0.000574 0.000859 0.000 0.002 3.7967 0.000574 0.000872 0.000 0.002 3.8533 0.000574 0.000885 0.000 0.002 3.9100 0.000574 0.000898 0.000 0.002 3.9667 0.000574 0.000911 0.000 0.002 4.0233 0.000574 0.000924 0.000 0.002 4.0800 0.000574 0.000937 0.000 0.002 4.1367 0.000574 0.000950 0.000 0.002 4.1933 0.000574 0.000963 0.000 0.002 4.2500 0.000574 0.000976 0.000 0.002 4.3067 0.000574 0.000989 0.000 0.002 4.3633 0.000574 0.001002 0.000 0.002 4.4200 0.000574 0.001015 0.000 0.002 4.4767 0.000574 0.001028 0.000 0.002 4.5333 0.000574 0.001041 0.000 0.002 4.5900 0.000574 0.001054 0.000 0.002 4.6467 0.000574 0.001067 0.000 0.002 4.7033 0.000574 0.001080 0.000 0.002 4.7600 0.000574 0.001093 0.000 0.002 4.8167 0.000574 0.001106 0.000 0.002 4.8733 0.000574 0.001119 0.000 0.002 Muresan – 3 Lot S.P. 40 WESI© PROJECT:18-1751-A 4.9300 0.000574 0.001132 0.000 0.002 4.9867 0.000574 0.001145 0.000 0.002 5.0433 0.000574 0.001177 0.047 0.002 5.1000 0.000574 0.001210 0.160 0.002 ___________________________________________________________________ Name : LOT 2 RETROFIT ROOF Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.017 (EXISTING LOT 2 ROOF RETROFIT. Impervious Total 0.017 Basin Total 0.017 Element Flows To: Surface Interflow Groundwater LOT 2 RETROFIT BIO LOT 2 RETROFIT BIO ___________________________________________________________________ Name : LOT 2 RETROFIT BIO Bottom Length: 5.00 ft. Bottom Width: 5.00 ft. Trench bottom slope 1: 0 To 1 Trench Left side slope 0: 0 To 1 Trench right side slope 2: 0 To 1 Material thickness of first layer: 5 Pour Space of material for first layer: 0.4 Material thickness of second layer: 0 Pour Space of material for second layer: 0 Material thickness of third layer: 0 Pour Space of material for third layer: 0 Infiltration On Infiltration rate: 4.86 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 1.929 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 1.929 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 5 ft. Riser Diameter: 6 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Muresan – 3 Lot S.P. 41 WESI© PROJECT:18-1751-A Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000574 0.000000 0.000 0.000 0.0567 0.000574 0.000013 0.000 0.002 0.1133 0.000574 0.000026 0.000 0.002 0.1700 0.000574 0.000039 0.000 0.002 0.2267 0.000574 0.000052 0.000 0.002 0.2833 0.000574 0.000065 0.000 0.002 0.3400 0.000574 0.000078 0.000 0.002 0.3967 0.000574 0.000091 0.000 0.002 0.4533 0.000574 0.000104 0.000 0.002 0.5100 0.000574 0.000117 0.000 0.002 0.5667 0.000574 0.000130 0.000 0.002 0.6233 0.000574 0.000143 0.000 0.002 0.6800 0.000574 0.000156 0.000 0.002 0.7367 0.000574 0.000169 0.000 0.002 0.7933 0.000574 0.000182 0.000 0.002 0.8500 0.000574 0.000195 0.000 0.002 0.9067 0.000574 0.000208 0.000 0.002 0.9633 0.000574 0.000221 0.000 0.002 1.0200 0.000574 0.000234 0.000 0.002 1.0767 0.000574 0.000247 0.000 0.002 1.1333 0.000574 0.000260 0.000 0.002 1.1900 0.000574 0.000273 0.000 0.002 1.2467 0.000574 0.000286 0.000 0.002 1.3033 0.000574 0.000299 0.000 0.002 1.3600 0.000574 0.000312 0.000 0.002 1.4167 0.000574 0.000325 0.000 0.002 1.4733 0.000574 0.000338 0.000 0.002 1.5300 0.000574 0.000351 0.000 0.002 1.5867 0.000574 0.000364 0.000 0.002 1.6433 0.000574 0.000377 0.000 0.002 1.7000 0.000574 0.000390 0.000 0.002 1.7567 0.000574 0.000403 0.000 0.002 1.8133 0.000574 0.000416 0.000 0.002 1.8700 0.000574 0.000429 0.000 0.002 1.9267 0.000574 0.000442 0.000 0.002 1.9833 0.000574 0.000455 0.000 0.002 2.0400 0.000574 0.000468 0.000 0.002 2.0967 0.000574 0.000481 0.000 0.002 2.1533 0.000574 0.000494 0.000 0.002 2.2100 0.000574 0.000507 0.000 0.002 2.2667 0.000574 0.000520 0.000 0.002 2.3233 0.000574 0.000533 0.000 0.002 2.3800 0.000574 0.000546 0.000 0.002 2.4367 0.000574 0.000559 0.000 0.002 2.4933 0.000574 0.000572 0.000 0.002 2.5500 0.000574 0.000585 0.000 0.002 2.6067 0.000574 0.000598 0.000 0.002 2.6633 0.000574 0.000611 0.000 0.002 2.7200 0.000574 0.000624 0.000 0.002 2.7767 0.000574 0.000637 0.000 0.002 2.8333 0.000574 0.000650 0.000 0.002 2.8900 0.000574 0.000663 0.000 0.002 2.9467 0.000574 0.000676 0.000 0.002 3.0033 0.000574 0.000689 0.000 0.002 3.0600 0.000574 0.000702 0.000 0.002 Muresan – 3 Lot S.P. 42 WESI© PROJECT:18-1751-A 3.1167 0.000574 0.000715 0.000 0.002 3.1733 0.000574 0.000728 0.000 0.002 3.2300 0.000574 0.000742 0.000 0.002 3.2867 0.000574 0.000755 0.000 0.002 3.3433 0.000574 0.000768 0.000 0.002 3.4000 0.000574 0.000781 0.000 0.002 3.4567 0.000574 0.000794 0.000 0.002 3.5133 0.000574 0.000807 0.000 0.002 3.5700 0.000574 0.000820 0.000 0.002 3.6267 0.000574 0.000833 0.000 0.002 3.6833 0.000574 0.000846 0.000 0.002 3.7400 0.000574 0.000859 0.000 0.002 3.7967 0.000574 0.000872 0.000 0.002 3.8533 0.000574 0.000885 0.000 0.002 3.9100 0.000574 0.000898 0.000 0.002 3.9667 0.000574 0.000911 0.000 0.002 4.0233 0.000574 0.000924 0.000 0.002 4.0800 0.000574 0.000937 0.000 0.002 4.1367 0.000574 0.000950 0.000 0.002 4.1933 0.000574 0.000963 0.000 0.002 4.2500 0.000574 0.000976 0.000 0.002 4.3067 0.000574 0.000989 0.000 0.002 4.3633 0.000574 0.001002 0.000 0.002 4.4200 0.000574 0.001015 0.000 0.002 4.4767 0.000574 0.001028 0.000 0.002 4.5333 0.000574 0.001041 0.000 0.002 4.5900 0.000574 0.001054 0.000 0.002 4.6467 0.000574 0.001067 0.000 0.002 4.7033 0.000574 0.001080 0.000 0.002 4.7600 0.000574 0.001093 0.000 0.002 4.8167 0.000574 0.001106 0.000 0.002 4.8733 0.000574 0.001119 0.000 0.002 4.9300 0.000574 0.001132 0.000 0.002 4.9867 0.000574 0.001145 0.000 0.002 5.0433 0.000574 0.001177 0.047 0.002 5.1000 0.000574 0.001210 0.160 0.002 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.04 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0.587 Total Impervious Area:0.466 Muresan – 3 Lot S.P. 43 WESI© PROJECT:18-1751-A ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.011746 5 year 0.019076 10 year 0.023175 25 year 0.027414 50 year 0.029962 100 year 0.032072 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.033977 5 year 0.052508 10 year 0.066879 25 year 0.08753 50 year 0.104793 100 year 0.123728 _________________________________________________________________ Increase in 100-year runoff = 0.1237 – 0.0321 = 0.0916 cfs < 0.10 cfs _________________________________________________________________ Perlnd and Implnd Changes No changes have been made. ___________________________________________________________________ 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. 2005-2021; All Rights Reserved. Muresan – 3 Lot S.P. 44 WESI© PROJECT:18-1751-A Minimum Requirement # 8: Wetland Protection According to a Wetland and Stream Reconnaissance by Altmann Oliver Associates, LLC there are no identifiable wetlands or streams on or immediately adjacent to the property. Note that defined clearing limits, silt fencing, and large vegetated spaces shown on the LDA plan will protect any downstream wetlands or streams. Minimum Requirement # 9: Operation and Maintenance Manual BMP T5.13 Post-Construction Soil Quality and Depth 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. Muresan – 3 Lot S.P. 45 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 46 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 47 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 48 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 49 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 50 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 51 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 52 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 53 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 54 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 55 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 56 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 57 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 58 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 59 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 60 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 61 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 62 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 63 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 64 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 65 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 66 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 67 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 68 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 69 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 70 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 71 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 72 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 73 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 74 WESI© PROJECT:18-1751-A Muresan – 3 Lot S.P. 75 WESI© PROJECT:18-1751-A APPENDIX I Drainage Plan CB#2 CB#1 YD#1 CB#3 CB#4 CB#5 CB#6 YD#3 YD#4 YD#5 YD#2 7 OF 12 DRAINAGE PLAN FOR: TAX ACCOUNT NO.(S):SITE ADDRESS: HARDSCAPE AREA CALCULATION 18-1751-A MURESAN SHORT PLATNE 1/4, SW 1/4, SEC.05, T.27N, R.04E, W.M.CITY OF EDMONDS, WASHINGTON PLN20190041 NE 1/4, SW 1/4, SEC.05, T.27N, R.04E, W.M.CITY OF EDMONDS, WASHINGTON COPYRIGHT © CITY OF EDMONDSAPPROVED FOR CONSTRUCTION LEGEND CB#X DRAINFIELD NOTE: FIRE MARSHAL NOTES: RIGHT-OF-WAY WORK NOTE: 05-25-2021 Muresan – 3 Lot S.P. 77 WESI© PROJECT:18-1751-A APPENDIX II SOIL INFORMATION Muresan – 3 Lot S.P. 78 WESI© PROJECT:18-1751-A SOIL LOG INFO. (PERFORMED BY NELSON GEOTECHNICAL ASSOCIATES, INC) TP-1 - TEST PIT 1 0.0'-2.0' TOPSOIL 2.0'-5.0' SAND W/ GRAVEL 5.0'-6.0' SILTY SAND W/ GRAVEL (TILL) (NO GROUNDWATER ENCOUNTERED) TP-2 - TEST PIT 2 0.0'-2.0' TOPSOIL 2.0'-3.0' SAND W/ GRAVEL & TRACE SILT 3.0'-9.0' SAND W/ OCCASIONAL GRAVEL (NO GROUNDWATER ENCOUNTERED) TP-3 - TEST PIT 3 0.0'-2.0' SAND W/ GRAVEL & TRACE SILT 2.0'-5.0' SANDY GRAVEL 5.0'-6.5' SAND W/ GRAVEL 6.5'-8.0' GRAVELY SAND (NO GROUNDWATER ENCOUNTERED) TP-4 - TEST PIT 4 0.0'-4.0' SAND W/ GRAVEL & SILT 4.0'-5.5' SAND W/ GRAVEL & TRACE SILT (NO GROUNDWATER ENCOUNTERED) HA-1 - HAND AUGER 1 0.0'-3.0' SAND W/ GRAVEL AND SOME SILT (NO GROUNDWATER ENCOUNTERED) HA-2 - HAND AUGER 2 0.0'-2.0' SAND W/ SOME SILT & TRACE GRAVEL (NO GROUNDWATER ENCOUNTERED) NOTE: “GROUNDWATER OR IMPERMEABLE HORIZONS ARE AT SIGNIFICANT DEPTH AND THERE SHOULD BE NO GROUNDWATER OR IMPERMEABLE HORIZONS WITHIN 5 FEET OF THE BASE OF PROPOSED INFILTRATION SYSTEMS ON THIS SITE.” REFER TO THE COMMENT RESPONSE MEMORANDUM BY NELSON GEOTECHNICAL ASSOCIATES, INC. DATED OCTOBER 24, 2019 FOR FURTHER INFORMATION. Muresan – 3 Lot S.P. 79 WESI© PROJECT:18-1751-A USDA SOIL MAP Muresan – 3 Lot S.P. 80 WESI© PROJECT:18-1751-A USDA SOIL MAP LEGEND 5—Alderwood-Urban land complex, 2 to 8 percent slopes Map Unit Setting • National map unit symbol: 2hz9 • Elevation: 50 to 800 feet • Mean annual precipitation: 25 to 60 inches • Mean annual air temperature: 48 to 52 degrees F • Frost-free period: 180 to 220 days • Farmland classification: Not prime farmland Map Unit Composition • Alderwood and similar soils: 60 percent • Urban land: 25 percent • Minor components: 6 percent • Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting • Landform: Till plains • Parent material: Basal till Typical profile • H1 - 0 to 7 inches: gravelly ashy sandy loam • H2 - 7 to 35 inches: very gravelly ashy sandy loam • H3 - 35 to 60 inches: gravelly sandy loam Properties and qualities • Slope: 2 to 8 percent • Depth to restrictive feature: 20 to 40 inches to densic material • Natural drainage class: Moderately well drained • Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.06 in/hr) • Depth to water table: About 18 to 36 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Low (about 3.0 inches) Interpretive groups • Land capability classification (irrigated): None specified • Land capability classification (nonirrigated): 4s • Hydrologic Soil Group: B • Other vegetative classification: Limited Depth Soils (G002XN302WA) Minor Components Mckenna • Percent of map unit: 2 percent • Landform: Depressions Norma • Percent of map unit: 2 percent • Landform: Depressions Terric medisaprists • Percent of map unit: 2 percent • Landform: Depressions Muresan – 3 Lot S.P. 81 WESI© PROJECT:18-1751-A APPENDIX III SOIL AMENDMENT 8 SECTION FOUR AMENDMENT OPTIONS Select the soil preparation options that best suit each area of the project site. Either choose a pre-approved default amendment rate, or have a qualified professional calculate a custom rate based on soil and amendment tests described in Section 5, using the calculation method described in Section 7 “Resources”). OPTION 1: Leave native vegetation and soil undisturbed, and protect from compaction during construction. Identify areas of the site that will not be stripped, logged, graded or driven on, and fence off those areas to prevent impacts during construction. If neither soils nor vegetation are disturbed, these areas do not require amendment. OPTION 2: Amend existing site topsoil or subsoil either at default “pre-approved” rates, or at custom calculated rates based on specifier's tests of the soil and amendment. Scarification. Scarify or till subgrade to 8 inches depth (or to depth needed to achieve a total depth of 12 inches of uncompacted soil after calculated amount of amendment is added). Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. Amend soil to meet required organic content. A. Planting Beds 1. PRE-APPROVED RATE: Place 3 inches of composted material and rototill into 5 inches of soil (a total amended depth of about 9.5 inches, for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount of composted material or approved organic material and rototill into depth of soil needed to achieve 8 inches of settled soil at 10% organic content. Rake beds to smooth and remove surface rocks larger than 2 inches diameter. Mulch planting beds with 2 inches of organic mulch. B. Turf Areas 1. PRE-APPROVED RATE: Place 1.75 inches of composted material and rototill into 6.25 inches of soil (a total amended depth of about 9.5 inches, for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount of composted material or approved organic material and rototill into depth of soil needed to achieve 8 inches of settled soil at 5% organic content. Water or roll to compact to 85% of maximum dry density. Rake to level, and remove surface woody debris and rocks larger than 1 inch diameter. Amendment Options – SECTION FOUR 9 OPTION 3: Stockpile existing topsoil during grading. Replace it before planting. Stockpiled topsoil must also be amended if needed to meet the organic matter or depth requirements, either at a pre-approved default rate or at a custom calculated rate. Scarification. If placed topsoil plus compost or other organic material will amount to less than 12 inches: Scarify or till subgrade to depth needed to achieve 12 inches of loosened soil after topsoil and amendment are placed. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. Stockpile and cover soil with weed barrier material that sheds moisture yet allows air transmission, in approved location, prior to grading. Replace stockpiled topsoil prior to planting. Amend if needed to meet required organic content. A. Planting Beds 1. PRE-APPROVED RATE: Place 3 inches of composted material and rototill into 5 inches of replaced soil (a total amended depth of about 9.5 inches, for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount of composted material or approved organic material and rototill into depth of replaced soil needed to achieve 8 inches of settled soil at 10% organic content. Rake beds to smooth and remove surface rocks larger than 2 inches diameter. Mulch planting beds with 2 inches of organic mulch or stockpiled duff. B. Turf Areas 1. PRE-APPROVED RATE: Place 1.75 inches of composted material and rototill into 6.25 inches of replaced soil (a total amended depth of about 9.5 inches, for a settled depth of 8 inches). 2. CALCULATED RATE: Place calculated amount of composted material or approved organic material and rototill into depth of replaced soil needed to achieve 8 inches of settled soil at 5% organic content. Water or roll to compact soil to 85% of maximum dry density. Rake to level, and remove surface rocks larger than 1 inch diameter. OPTION 4: Import topsoil mix of sufficient organic content and depth to meet the requirements. Scarification. Scarify or till subgrade in two directions to 6 inches depth. Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. A. Planting Beds Use imported topsoil mix containing 10% organic matter (typically around 40% compost). Soil portion must be sand or sandy loam as defined by the USDA. Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. Place second lift of 3 inches topsoil mix on surface. Rake beds to smooth, and remove surface rocks over 2 inches diameter. Mulch planting beds with 2 inches of organic mulch. B. Turf Areas Use imported topsoil mix containing 5% organic matter (typically around 25% compost). Soil portion must be sand or sandy loam as defined by the USDA. Place 3 inches of imported topsoil mix on surface and till into 2 inches of soil. Place second lift of 3 inches topsoil mix on surface. Water or roll to compact soil to 85% of maximum. Rake to level, and remove surface rocks larger than 1 inch diameter. 10 SECTION FIVE GUIDE TO DEVELOPING A SOIL MANAGEMENT PLAN This section outlines steps for professional specifiers to prepare a Soil Management Plan (SMP) to meet the provisions of BMP T5.13 in the Department of Ecology’s Stormwater Manual for Western Washington. The main steps to creating the SMP are: Step 1: Review Site Landscape Plans and Grading Plans. Examine all areas that will not be covered by structures, impervious surfaces, or stormwater detention / infiltration structures, to assess how grading will impact soil conditions and determine areas where different soil treatments may be applied. Those allowed soil treatment options are: Option 1: Areas where native soil and/or vegetation will be retained in place; Option 2: Areas where topsoil or subsoil will be amended in place; Option 3: Areas where topsoil will be stripped and stockpiled prior to grading for reapplication, and; Option 4: Areas where imported topsoil will be applied. Step 2: Visit Site to Determine Soil Conditions Working with plans, check the soil in each area to identify information outlined in the chart below. Identify compaction of subgrade in each area by digging down to a level that will be 12” below finished grade. Use a shovel or “rod penetrometer” driven solely by the your weight, as described in Section 3, and illustrated in Section 6 “Field Guide to Verifying Soil Quality and Depth.” Areas Assess Conditions Include Information on SMP Native vegetation / undisturbed soil to be preserved  Established native plants.  Undisturbed topsoil and duff layer.  Identify those areas to be left undisturbed and fenced during construction. Topsoil not requiring grading, but cleared of native vegetation  Depth of compacted layers less than 12 inches deep.  Presence of organic matter that may make amendment unnecessary, or allow calculation of reduced amendment rate.  If planning to use calculated amendment rate, sample and test soil as described in Step 4.  Will scarification be needed? What depth of scarification is required to allow compost incorporation and achieve 12 inches uncompacted depth?  Will area be amended with compost or topsoil at “pre- approved” rate, or custom calculated rate?  Can areas be protected from compaction during construction? Areas to be cut during grading  Quantity of topsoil that can pbe stockpiled and reapplied.  Depth of any compacted layer less than 12 inches below ultimate finished grade.  Presence of organic matter in subgrade or topsoil that may make amendment unnecessary, or allow calculation of reduced amendment rate.  If planning to use calculated amendment rate, sample and test soil as described in Step 4.  Will scarification be needed? What depth of scarification is required to allow compost incorporation and achieve 12 inches uncompacted depth?  Will topsoil be stockpiled during grading and reapplied? Will it require supplemental topsoil or compost to achieve 8 inches depth at specified organic content?  Will area be amended with compost or topsoil at “pre- approved” rate, or at custom calculated rate? Areas to be filled during grading  Estimate what subgrade conditions will be when fill is in place.  Depth of any compacted layer less than 12 inches below ultimate finished grade.  Presence of organic matter in fill soil that may make amendment unnecessary, or allow calculation of reduced amendment rate.  If planning to use calculated amendment rate, sample and test soil as described in Step 4.  What depth of scarification is required to allow compost incorporation and achieve 12 inches uncompacted depth?  Will area be amended with compost or topsoil at “pre- approved” rate, or custom calculated rate? Developing a Soil Management Plan – SECTION FIVE 11 Step 3: Select Amendment Options. The most convenient and economic method for achieving the Soil Quality and Depth guidelines depends on: site soil conditions, grading, and resulting subgrade compaction; the practicality of stockpiling topsoil during grading; and site access issues. “Pre-Approved” or custom calculated rates? Use of “Pre-Approved” amendment rates may simplify planning, however custom calculated rates can save substantial effort and expense—easily repaying the expense of testing and calculations. (See testing required for custom rates at right and on next page, and calculation method in Section 7 “Resources”.) Often pasture or woodland soils have adequate organic matter if existing organic layers are preserved. Also, compost products will frequently provide the desired soil organic matter content at lower applications than the Pre- Approved rates (which are based on “average” conditions). Identifying Options on the Site Plan and SMP form  Identify the areas where each amendment option will be applied by outlining each area on the site plan with a dark, thick-line pen.  Assign each area an identifying number or letter (A, B, C…) on the plan, and on the Soil Management Plan form. Step 4: Identify Compost, Topsoils and Other Organic Materials for Amendment and Mulch. Amendments for Pre-Approved rates must be compost meeting the definition for “Composted Materials” in WAC 173-350, section 220, (available online at www.ecy.wa.gov/programs/swfa/organics/soil.html ) or topsoil manufactured from these composts plus clean sand or sandy loam soil. Products must be identified on the Soil Management Plan form, and recent product test results must be provided showing that they meet the additional requirements in this Guide for organic matter content and carbon to nitrogen ratio (see specification in Section 3). For Custom Calculated amendment rates (see right, next page, and formula in Section 7 “Resources”), organic matter may be provided by:  Compost (as defined above), or  Other by organic materials with a carbon to nitrogen ratio under 25:1 (35:1 for native plantings), meeting the same contaminant standards as “Composted Materials” in WAC 173-350, section 220. These products must be identified on the Soil Management Plan form, and recent test results provided showing that they meet these requirements. Step 5: Calculate Amendment, Topsoil and Mulch Volumes on SMP form  For Pre-Approved amendment rates, figure the square footage of each area and complete the simple calculation to convert inches of amendment into cubic yards.  To compute custom calculated amendment rates, use soil and amendment test results and the Model Amendment Rate Calculator Spreadsheet and/or the Equation for Calculating Compost Application Rates (both are in Section 7 “Resources”) to achieve the target Soil Organic Matter content (10% SOM for landscape beds, or 5% SOM for turf areas). Sampling and Testing for Custom Calculated Amendment Rates Soil and amendments submitted for testing should be a composite of samples taken from several spots on a site or in a pile of amendment. Soil: Gather samples from soil that will be the subgrade after all grading operations are completed, before placement of imported topsoil or amendments.  Take samples from 10-12 spots in each area. Imagine a line dividing the area in half lengthwise, then divide each half into five near equal sized widths. Take samples near the middle of each subsection.  At each sampling spot dig a spades-width hole at least 8 inches deep, then shave a 1 inch slice from the side of the hole to use in the composite sample.  Thoroughly mix the 10-12 samples from each turf or planting area together in a clean plastic bucket or bowl. Place 2 cups of the mix into a sealable plastic bag for testing (some tests may require more soil, ask laboratories).  Label the bag with the site information, area of sample; plus your name, address and phone number. Amendment: Producers of composts and manufactured topsoils can usually provide test results for their products. If tests are Site Assessment Supplies  Copy of site grading plan  Sturdy shovel  Tape measure If using custom calculated amendment rates requiring soil tests:  Clean bucket or stainless steel bowl for mixing soil samples  Sealable bags for soil samples, and indelible ink pen to label Developing a Soil Management Plan – SECTION FIVE 12 nonexistent or incomplete, conduct necessary tests on each proposed amendment.  Take samples from 10-12 spots in pile of material. Imagine a line dividing the pile in half lengthwise, then gather samples from five spots equally spaced along the length of each side of the pile.  At each sampling spot, dig a spades-width hole at least 8 inches deep. Use a clean cup or trowel to collect a cup of amendment from the bottom of each hole.  Thoroughly mix the 10-12 samples from each pile together in a clean plastic bucket or bowl. Place 2 cups of the mix into a sealable plastic bag for testing (some tests may require more compost, ask laboratories).  Label the bag with the product and supplier information; plus your name, address and phone number. Tests to Conduct for Custom Calculated Amendment Rates: Soil Compost Amendment - Bulk Density - Bulk Density - Percent Organic Matter (by “loss on ignition” method) - Percent Organic Matter (by “loss on ignition” method) - Moisture Content as is - Carbon to Nitrogen Ratio (C:N) - Heavy Metals Analysis (per WAC 173-350, section 220) Developing a Soil Management Plan – SECTION FIVE 13 15809 70th Avenue West, Edmonds, WA 98026 Short Plat David Muresan 425-443-6576 15809 70th Avenue West, Edmonds, WA 98026 Same as Permit Holder Timothy Sarkela (WESI) x 1.75 5.43 10.6 57.6 Compost 60 Up To 14 SECTION SIX FIELD GUIDE TO VERIFYING SOIL QUALITY AND DEPTH IN NEW LANDSCAPES This guide is provided to help professional inspectors verify implementation of soil improvements to fulfill BMP T5.13 “Post Construction Soil Quality and Depth” in the Washington Department of Ecology’s Stormwater Management Manual Western Washington. The main conditions to be confirmed are: 1. Provision of eight inches of topsoil containing 10% organic matter in planting beds, or 5% in turf areas. 2. Scarification of compacted subsoil four inches below the topsoil layer (for a total uncompacted depth of 12 inches). 3. Placement of two inches of mulch on all planting beds. The following steps may be completed at multiple visits as a project progresses or in one final project approval inspection, depending on local practices: STEP 1: Compare site conditions with approved Soil Management Plan (SMP). The SMP approved with the site permit describes soil treatments approved for each area. Make sure site conditions match these details in the SMP:  Site location and permit holder.  Turf and planting areas match approved drawings.  Areas to remain as undisturbed native soil and vegetation have been fenced off during construction to prevent soil compaction or damage to plants. STEP 2: Inspect delivery tickets for compost, topsoil and mulches. Permitee must provide original delivery tickets for all soil and mulch products. Compare delivery tickets with the SMP to match the following information:  Delivery location.  Total quantities for each soil product and mulch.  Product descriptions and sources. If materials other than those listed in the SMP were delivered, laboratory test results must be provided to confirm that they are equivalent to approved products. STEP 3: Verify depth of amended soil and scarification. Use a shovel to dig at least one test hole per acre for turf and one per acre for planting beds to verify eight inch topsoil depth (below mulch layer), incorporation of amendments, and four inches of uncompacted subsoil. Eight Inch Depth of Amended Soil. The top eight inches of soil should be easy to dig using a garden spade driven solely by your weight. The soil should be darker than the unamended soil below, and particles of added organic Site Inspection Supplies  A copy of the approved Soil Management Plan (SMP) for the site, with site drawing.  A sturdy shovel  Tape measure or 12” ruler  3/8 inch diameter 3-4 foot stainless steel “rod penetrometer” with a 1/8” bevel cut into the tip at 30 degrees from the side, and a 90 degree bend at top to form a handle (see illustration, next page).  Field Verification Form to record results Test holes should be about one foot deep (after first scraping away any mulch) and about one foot square. Verifying Soil Quality and Depth – SECTION SIX 15 matter are likely to be visible. Clay soil that been saturated and then dried may require jumping on the shovel step to penetrate, but the soil should yield easily when moist. Soil that requires vigorous chipping with the shovel to penetrate probably does not meet the specification. Four Inch Depth of Scarified Subsoil. The next four-inch depth of soil should be loose enough to penetrate with the shovel. It may be rocky, and the loosened depth may vary due to the pattern of scarifying equipment – but some sections of subsoil in a one foot square hole should be loose four inches deep into the subsoil (that is, to a total 12 inch depth from the soil surface). STEP 4: Check soil depth in several spots. Use a simple “rod penetrometer” (illustration below) to confirm that the soil is uncompacted twelve inches deep at ten locations per acre – with a minimum of ten on smaller sites. To locate test spots, imagine a line dividing the site (or each acre) in half lengthwise, then divide each half into five nearly equal sections. Conduct tests near the middle of each section. Additional test locations are encouraged. The rod penetrometer should enter the soil twelve inches deep, driven solely by the inspector’s weight. Irregular scarification or rocks in the lower layer may require probing a few spots at each location to reach the full depth. STEP 5: Check mulch depth. Use a shovel to scrape away and reveal surface mulch thickness. A two inch layer of organic material (mulch) such as composted sawdust, wood chips, or ground bark should be distinguished from the underlying soil on all planting beds. FINAL STEP: Record results on “Field Verification Form” or similar document (see sample form on next page). What should be attached to the Soil Management Plan?  Scale drawings showing layout of turf and planting beds, and identifying where soil treatments described in the SMP will be applied.  Copies of compost and topsoil test results demonstrating that products contain adequate organic matter, and meet carbon to nitrogen ratio and stability standards.  Where custom calculated amendment rates are used, include laboratory analyses of the soil and organic matter sources plus calculations by a qualified professional showing that the organic matter requirement will be achieved. What If A Site Does Not Meet the Soil Management Plan Requirements? If inspection indicates that an installation does not fulfill the approved SMP, the permit holder or their agent should be notified of what steps are needed to comply. When results are unclear or disputed, an independent consultant should conduct sampling for analytical testing of organic matter as described in the project specifications. Qualified consultants include: Certified Soil Scientists, Crop Advisors or Agronomists; or Licensed Landscape Architects, Civil Engineers or Geologists. A rod penetrometer is a 4 foot long, 3/8 inch or 10 mm diameter stainless steel rod with a 90 degree bend 5 inches form the top to make a handle, and a 30 degree bevel cut 1/8 inch or 3 mm into the side of the tip. Verifying Soil Quality and Depth – SECTION SIX 16