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Home My WebLink AboutRevisedTIRPages1-1 1. PROJECT OVERVIEW The original Greenleaf project is a 34-lot plat located on the west side of 108th Ave SE, just north of SE 192nd St, in the City of Renton, WA. The proposed Greenleaf 2 project is an extension of the original project, consisting of a 3-lot short plat on parcel 3223059088, north of SE 188th Street, on 0.53 acres. See Figure 1.1 for the Greenleaf Vicinity Map. Structures on the existing site have been demolished and the parcel is generally grassed with trees. The existing site is moderately sloped at approximately 5 percent sloping generally to the southwest. See Figure 1.2 for the Existing Site Conditions. The Greenleaf 2 0.53 acre project site consists of 3 residential lots that will have new single-family dwelling units. 31 lots were developed under a previously approved permit, and 3 lots were added later. For access, the original project created a new intersection off 108th Ave SE at the northeast corner of the project site. There is also an access point to 108th Ave SE created at the midpoint of the project site, through an access easement of the adjoining property. The Greenleaf 2 project will access off of this second access point to 108th Ave SE, now called SE 188th Street. See Figure 1.3 for the Proposed Site Conditions. According to the Geotech Report prepared by Earth Solutions NW and the Summary Letter for Greenleaf 2, the overall site is underlain primarily by native soils consisting of dense glacial till and silty sand with gravel. Additionally, according to the USDA NRCS soil mapping service, the entire site is underlain by Alderwood Gravelly Sandy Loam (a till soil), which varies from 5-30%. See Figure 1.4 for the Soils Map. A stormwater detention pond located in the southwest portion of the overall site was previously approved to meet the overall project’s stormwater detention requirements. The detention pond was designed with a factor of safety and has sufficient capacity to accommodate the proposed Greenleaf 2 project. See Section 4 for more information. For the 3 residential lots, 3 driveways are required, with a total pollution generating impervious area of 608 square feet. A Kristar Perk Filter vault that follows the detention pond treats the original Greenleaf project and has sufficient capacity to treat the additional area. The detention pond/Kristar Perk Filter discharges to the west to Panther Creek, a well defined stream. Based on the City of Renton’s Flow Control Application Map, the project site is in the Flow Control Duration Standard (Forested Conditions) area. The overall project will be subject to Full Drainage Review per the City of Renton 2009 Surface Water Design Manual Amendments and the 2009 King County Surface Water Design Manual (2009 KCSWDM). The City of Renton 2009 Surface Water Design Manual Amendment and the 2009 KCSWDM will collectively be referred to as the “2009 Surface Water Design Manual”. 2-1 2. CONDITIONS AND REQUIREMENTS SUMMARY Review of the 8 Core Requirements and 6 Special Requirements This section describes how the project will meet the 2009 Surface Water Design Manual’s Core and Special Requirements. Core Requirement No. 1 Discharge at the Natural Location In the existing conditions, the site drains to the west, towards Panther Creek. The original project’s detention pond discharges to the west corner of the site, which is the natural discharge location for the project site. Core Requirement No. 2 Off-site Analysis A Level 1 Downstream Analysis was performed by ESM on September 19, 2013 for the original project, which also applies to the proposed Greenleaf 2 project. See Section 3 for the offsite analysis. Core Requirement No. 3 Flow Control Based on the City of Renton’s Flow Control Application Map, the project site is in the Flow Control Duration Standard (Forested Conditions) area. See Section 4 for Flow Control Analysis and Calculations. Core Requirement No. 4 Conveyance System The stormwater drainage conveyance system has been sized to convey the 25 year design storm event and to contain the 100 year design storm event as part of the original Greenleaf project. The existing conveyance system has sufficient capacity to accommodate the proposed Greenleaf 2 project. See Section 5 and Appendix A. Core Requirement No. 5 Erosion and Sediment Control Erosion and sediment controls will be provided to prevent, to the maximum extent possible, the transport of sediment from the project site to downstream drainage facilities, water resources, and adjacent properties. The Temporary Erosion and Sedimentation Control (TESC) plan for the Greenleaf 2 project shows silt fence and a construction entrance to maintain erosion and sediment control. Core Requirement No. 6 Maintenance and Operations The Operations and Maintenance Manual for the overall project is provided in Appendix D. Core Requirement No. 7 Financial Guarantees and Liability All drainage facilities constructed for the project comply with the financial guarantee requirements is provided in the City of Renton Bond Quantities Worksheet in Section 9 of this report. Core Requirement No. 8 Water Quality For the 3 residential lots, 3 driveways are required, with a total pollution generating impervious area of 608 square feet. A Kristar Perk Filter vault that follows the detention pond treats the original Greenleaf project and has sufficient capacity to treat the additional area. See Section 4 for more information. 4-5 4.5 Water Quality Facility For the 3 residential lots, 3 driveways are required, with a total pollution generating impervious area of 608 square feet (0.014 acres). A Kristar Perk Filter vault that follows the detention pond treats the original Greenleaf project using a 2 year storm treatment release rate of 0.202 cfs. The additional pollution generating impervious area results in a 2 year storm treatment release rate of 0.004 cfs, for a total treatment release rate of 0.2024 cfs. The Kristar Perk Filter treatment flowrate provided is 0.33 cfs, which is adequate to the additional 3 lots. The rooftops, patios, landscaped areas and sidewalk are considered clean runoff. In summary, the proposed Greenleaf 2 project does not require additional water quality treatment. greenleaf2.pks Flow Frequency Analysis Time Series File:greenleaf2.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.003 7 10/10/00 3:00 0.007 1 100.00 0.990 0.003 8 1/05/02 16:00 0.005 2 25.00 0.960 0.004 3 12/08/02 18:00 0.004 3 10.00 0.900 0.004 6 8/26/04 2:00 0.004 4 5.00 0.800 0.004 4 10/28/04 16:00 0.004 5 3.00 0.667 0.004 5 1/18/06 16:00 0.004 6 2.00 0.500 0.005 2 10/26/06 0:00 0.003 7 1.30 0.231 0.007 1 1/09/08 6:00 0.003 8 1.10 0.091 Computed Peaks 0.006 50.00 0.980 Page 1 Site Improvement Bond Quantity Worksheet S15 Web date: 04/03/2015 Department of Permitting & Environmental Review 35030 SE Douglas Street, Suite 210 Snoqualmie, Washington 98065-9266 206-296-6600 TTY Relay 711 Project Name:Date: Location:Project No.: Activity No.: Note: All prices include labor, equipment, materials, overhead and Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area or from local sources if not included in the RS Means database. _____________yes __________________no If yes, Forest Practice Permit Number: (RCW 76.09) Page 1 of 9 Greenleaf 2 18661 108th Avenue SE, Renton, WA For alternate formats, call 206-296-6600. __________________ 5/19/2016 bondquantityworksheet.xls Unit prices updated: 3/2/2015 Version: 3/2/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet S15 Web date: 04/03/2015 Unit # of Reference #Price Unit Quantity Applications Cost EROSION/SEDIMENT CONTROL Number Backfill & compaction-embankment ESC-1 6.00$CY 260 1 1560 Check dams, 4" minus rock ESC-2 SWDM 5.4.6.3 80.00$Each Crushed surfacing 1 1/4" minus ESC-3 WSDOT 9-03.9(3)95.00$CY Ditching ESC-4 9.00$CY Excavation-bulk ESC-5 2.00$CY Fence, silt ESC-6 SWDM 5.4.3.1 1.50$LF 430 1 645 Fence, Temporary (NGPE)ESC-7 1.50$LF Hydroseeding ESC-8 SWDM 5.4.2.4 0.80$SY 800 1 640 Jute Mesh ESC-9 SWDM 5.4.2.2 3.50$SY Mulch, by hand, straw, 3" deep ESC-10 SWDM 5.4.2.1 2.50$SY Mulch, by machine, straw, 2" deep ESC-11 SWDM 5.4.2.1 2.00$SY Piping, temporary, CPP, 6"ESC-12 12.00$LF Piping, temporary, CPP, 8"ESC-13 14.00$LF Piping, temporary, CPP, 12"ESC-14 18.00$LF Plastic covering, 6mm thick, sandbagged ESC-15 SWDM 5.4.2.3 4.00$SY Rip Rap, machine placed; slopes ESC-16 WSDOT 9-13.1(2)45.00$CY Rock Construction Entrance, 50'x15'x1'ESC-17 SWDM 5.4.4.1 1,800.00$Each 1 1 1800 Rock Construction Entrance, 100'x15'x1'ESC-18 SWDM 5.4.4.1 3,200.00$Each Sediment pond riser assembly ESC-19 SWDM 5.4.5.2 2,200.00$Each Sediment trap, 5' high berm ESC-20 SWDM 5.4.5.1 19.00$LF Sed. trap, 5' high, riprapped spillway berm section ESC-21 SWDM 5.4.5.1 70.00$LF Seeding, by hand ESC-22 SWDM 5.4.2.4 1.00$SY Sodding, 1" deep, level ground ESC-23 SWDM 5.4.2.5 8.00$SY Sodding, 1" deep, sloped ground ESC-24 SWDM 5.4.2.5 10.00$SY TESC Supervisor ESC-25 110.00$HR Water truck, dust control ESC-26 SWDM 5.4.7 140.00$HR WRITE-IN-ITEMS **** (see page 9) Each ESC SUBTOTAL:4,645.00$ 30% CONTINGENCY & MOBILIZATION:1,393.50$ ESC TOTAL:6,038.50$ COLUMN:A Page 2 of 9 bondquantityworksheet.xls Unit prices updated: 3/2/2015 Version: 3/2/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Private Right-of-Way Right of Way Improvements Unit Price Unit Quant.Cost Quant.Cost Quant.Cost GENERAL ITEMS No. Backfill & Compaction- embankment GI - 1 6.00$CY 260 1,560.00 Backfill & Compaction- trench GI - 2 9.00$CY Clear/Remove Brush, by hand GI - 3 1.00$SY Clearing/Grubbing/Tree Removal GI - 4 10,000.00$Acre Excavation - bulk GI - 5 2.00$CY 510 1,020.00 Excavation - Trench GI - 6 5.00$CY Fencing, cedar, 6' high GI - 7 20.00$LF Fencing, chain link, vinyl coated, 6' high GI - 8 20.00$LF Fencing, chain link, gate, vinyl coated, 20'GI - 9 1,400.00$Each Fencing, split rail, 3' high GI - 10 15.00$LF Fill & compact - common barrow GI - 11 25.00$CY Fill & compact - gravel base GI - 12 27.00$CY Fill & compact - screened topsoil GI - 13 39.00$CY Gabion, 12" deep, stone filled mesh GI - 14 65.00$SY Gabion, 18" deep, stone filled mesh GI - 15 90.00$SY Gabion, 36" deep, stone filled mesh GI - 16 150.00$SY Grading, fine, by hand GI - 17 2.50$SY Grading, fine, with grader GI - 18 2.00$SY 2500 5,000.00 Monuments, 3' long GI - 19 250.00$Each Sensitive Areas Sign GI - 20 7.00$Each Sodding, 1" deep, sloped ground GI - 21 8.00$SY Surveying, line & grade GI - 22 850.00$Day Surveying, lot location/lines GI - 23 1,800.00$Acre Traffic control crew ( 2 flaggers )GI - 24 120.00$HR Trail, 4" chipped wood GI - 25 8.00$SY Trail, 4" crushed cinder GI - 26 9.00$SY Trail, 4" top course GI - 27 12.00$SY Wall, retaining, concrete GI - 28 55.00$SF Wall, rockery GI - 29 15.00$SF Page 3 of 9 SUBTOTAL 7,580.00 & Drainage Facilities *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Right-of-way Right of Way Improvements Unit Price Unit Quant.Cost Quant.Cost Quant.Cost ROAD IMPROVEMENT No. AC Grinding, 4' wide machine < 1000sy RI - 1 30.00$SY AC Grinding, 4' wide machine 1000-2000syRI - 2 16.00$SY AC Grinding, 4' wide machine > 2000sy RI - 3 10.00$SY AC Removal/Disposal RI - 4 35.00$SY Barricade, type III ( Permanent )RI - 6 56.00$LF Curb & Gutter, rolled RI - 7 17.00$LF Curb & Gutter, vertical RI - 8 12.50$LF 82 1,025.00 Curb and Gutter, demolition and disposal RI - 9 18.00$LF 28 504.00 Curb, extruded asphalt RI - 10 5.50$LF Curb, extruded concrete RI - 11 7.00$LF Sawcut, asphalt, 3" depth RI - 12 1.85$LF Sawcut, concrete, per 1" depth RI - 13 3.00$LF Sealant, asphalt RI - 14 2.00$LF Shoulder, AC, ( see AC road unit price ) RI - 15 -$SY Shoulder, gravel, 4" thick RI - 16 15.00$SY Sidewalk, 4" thick RI - 17 38.00$SY 160 6,080.00 Sidewalk, 4" thick, demolition and disposal RI - 18 32.00$SY Sidewalk, 5" thick RI - 19 41.00$SY Sidewalk, 5" thick, demolition and disposal RI - 20 40.00$SY Sign, handicap RI - 21 85.00$Each Striping, per stall RI - 22 7.00$Each Striping, thermoplastic, ( for crosswalk ) RI - 23 3.00$SF Striping, 4" reflectorized line RI - 24 0.50$LF Page 4 of 9 SUBTOTAL 7,609.00 Private & Drainage Facilities *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Private Right-of-way Right of Way Improvements Unit Price Unit Quant.Cost Quant.Cost Quant.Cost ROAD SURFACING No. (4" Rock = 2.5 base & 1.5" top course) 9 1/2" Rock= 8" base & 1.5" top course) Additional 2.5" Crushed Surfacing RS - 1 3.60$SY HMA 1/2" Overlay, 1.5"RS - 2 14.00$SY HMA 1/2" Overlay 2"RS - 3 18.00$SY HMA Road, 2", 4" rock, First 2500 SY RS - 4 28.00$SY HMA Road, 2", 4" rock, Qty. over 2500 SY RS - 5 21.00$SY HMA Road, 3", 9 1/2" Rock, First 2500 SY RS - 6 35.00$SY HMA Road, 3", 9 1/2" Rock, Qty Over 2500 SYRS - 7 42.00$SY Not Used RS - 8 Not Used RS - 9 HMA Road, 6" Depth, First 2500 SY RS - 10 33.10$SY HMA Road, 6" Depth, Qty. Over 2500 SY RS - 11 30.00$SY HMA 3/4" or 1", 4" Depth RS - 12 20.00$SY Gravel Road, 4" rock, First 2500 SY RS - 13 15.00$SY Gravel Road, 4" rock, Qty. over 2500 SY RS - 14 10.00$SY PCC Road (Add Under Write-Ins w/Design)RS - 15 Thickened Edge RS - 17 8.60$LF Page 5 of 9 SUBTOTAL & Drainage Facilities *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Private Right-of-way Right of Way Improvements Unit Price Unit Quant.Cost Quant.Cost Quant.Cost DRAINAGE (CPP = Corrugated Plastic Pipe, N12 or Equivalent) Access Road, R/D D - 1 21.00$SY Bollards - fixed D - 2 240.74$Each Bollards - removable D - 3 452.34$Each * (CBs include frame and lid) CB Type I D - 4 1,500.00$Each CB Type IL D - 5 1,750.00$Each CB Type II, 48" diameter D - 6 2,300.00$Each for additional depth over 4'D - 7 480.00$FT CB Type II, 54" diameter D - 8 2,500.00$Each for additional depth over 4'D - 9 495.00$FT CB Type II, 60" diameter D - 10 2,800.00$Each for additional depth over 4'D - 11 600.00$FT CB Type II, 72" diameter D - 12 3,600.00$Each for additional depth over 4'D - 13 850.00$FT Through-curb Inlet Framework (Add)D - 14 400.00$Each Cleanout, PVC, 4"D - 15 150.00$Each Cleanout, PVC, 6"D - 16 170.00$Each 3 510.00 Cleanout, PVC, 8"D - 17 200.00$Each Culvert, PVC, 4"D - 18 10.00$LF Culvert, PVC, 6"D - 19 13.00$LF 60 780.00 Culvert, PVC, 8"D - 20 15.00$LF Culvert, PVC, 12"D - 21 23.00$LF Culvert, CMP, 8"D - 22 19.00$LF Culvert, CMP, 12"D - 23 29.00$LF Culvert, CMP, 15"D - 24 35.00$LF Culvert, CMP, 18"D - 25 41.00$LF Culvert, CMP, 24"D - 26 56.00$LF Culvert, CMP, 30"D - 27 78.00$LF Culvert, CMP, 36"D - 28 130.00$LF Culvert, CMP, 48"D - 29 190.00$LF Culvert, CMP, 60"D - 30 270.00$LF Culvert, CMP, 72"D - 31 350.00$LF Page 6 of 9 SUBTOTAL 1,290.00 & Drainage Facilities For Culvert prices, Average of 4' cover was assumed. Assume perforated PVC is same price as solid pipe. *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Private Right-of-way Right of Way Improvements DRAINAGE CONTINUED No. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Culvert, Concrete, 8"D - 32 25.00$LF Culvert, Concrete, 12"D - 33 36.00$LF Culvert, Concrete, 15"D - 34 42.00$LF Culvert, Concrete, 18"D - 35 48.00$LF Culvert, Concrete, 24"D - 36 78.00$LF Culvert, Concrete, 30"D - 37 125.00$LF Culvert, Concrete, 36"D - 38 150.00$LF Culvert, Concrete, 42"D - 39 175.00$LF Culvert, Concrete, 48"D - 40 205.00$LF Culvert, CPP, 6"D - 41 14.00$LF Culvert, CPP, 8"D - 42 16.00$LF Culvert, CPP, 12"D - 43 24.00$LF Culvert, CPP, 15"D - 44 35.00$LF Culvert, CPP, 18"D - 45 41.00$LF Culvert, CPP, 24"D - 46 56.00$LF Culvert, CPP, 30"D - 47 78.00$LF Culvert, CPP, 36"D - 48 130.00$LF Ditching D - 49 9.50$CY Flow Dispersal Trench (1,436 base+)D - 50 28.00$LF French Drain (3' depth)D - 51 26.00$LF Geotextile, laid in trench, polypropylene D - 52 3.00$SY Mid-tank Access Riser, 48" dia, 6' deep D - 54 2,000.00$Each Pond Overflow Spillway D - 55 16.00$SY Restrictor/Oil Separator, 12"D - 56 1,150.00$Each Restrictor/Oil Separator, 15"D - 57 1,350.00$Each Restrictor/Oil Separator, 18"D - 58 1,700.00$Each Riprap, placed D - 59 42.00$CY Tank End Reducer (36" diameter)D - 60 1,200.00$Each Trash Rack, 12"D - 61 350.00$Each Trash Rack, 15"D - 62 410.00$Each Trash Rack, 18"D - 63 480.00$Each Trash Rack, 21"D - 64 550.00$Each Page 7 of 9 SUBTOTAL & Drainage Facilities *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Existing Future Public Private Right-of-way Right of Way Improvements Unit Price Unit Quant.Price Quant.Cost Quant.Cost PARKING LOT SURFACING No. 2" AC, 2" top course rock & 4" borrow PL - 1 21.00$SY NA NA 2" AC, 1.5" top course & 2.5" base coursePL - 2 28.00$SY NA NA 4" select borrow PL - 3 5.00$SY NA NA 1.5" top course rock & 2.5" base course PL - 4 14.00$SY NA NA UTILITY POLES & STREET LIGHTING Utility pole relocation costs must be accompanied by Franchise Utility's Cost Estimate Utility Pole(s) Relocation UP-1 Street Light Poles w/Luminaires UP-2 Each WRITE-IN-ITEMS (Such as detention/water quality vaults.)No. WI - 1 Each WI - 2 SY WI - 3 CY WI - 4 LF WI - 5 FT WI - 6 WI - 7 WI - 8 WI - 9 WI - 10 SUBTOTAL SUBTOTAL (SUM ALL PAGES):7,609.00 8,870.00 30% CONTINGENCY & MOBILIZATION:2,282.70 2,661.00 GRANDTOTAL:9,891.70 11,531.00 COLUMN:B C D Page 8 of 9 Lump Sum & Drainage Facilities Not To Be Used For Roads Or Shoulders *KCC 27A authorizes only one bond reduction. bondquantityworksheet.xls Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016 Site Improvement Bond Quantity Worksheet Web date: 04/03/2015 Original bond computations prepared by: Name:Date: PE Registration Number:Tel. #: Firm Name: Address:Project No: Stabilization/Erosion Sediment Control (ESC)(A) Existing Right-of-Way Improvements (B) Future Public Right of Way & Drainage Facilities (C) Private Improvements (D) Calculated Quantity Completed Total Right-of Way and/or Site Restoration Bond*/**(A+B) (First $7,500 of bond* shall be cash.) Performance Bond* Amount (A+B+C+D) = TOTAL (T)T x 0.30 Minimum is $2000.Minimum is $2000. Maintenance/Defect Bond* Total Minimum is $2000. NAME OF PERSON PREPARING BOND* REDUCTION:Date: * NOTE:The word "bond" as used in this document means a financial guarantee acceptable to King County. ** NOTE:KCC 27A authorizes right of way and site restoration bonds to be combined when both are required. The restoration requirement shall include the total cost for all TESC as a minimum, not a maximum. In addition, corrective work, both on- and off-site needs to be included. Quantities shall reflect worse case scenarios not just minimum requirements. For example, if a salmonid stream may be damaged, some estimated costs for restoration needs to be reflected in this amount. The 30% contingency and mobilization costs are computed in this quantity. *** NOTE:Per KCC 27A, total bond amounts remaining after reduction shall not be less than 30% of the original amount (T) or as revised by major design changes. REQUIRED BOND* AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY KING COUNTY 5/19/2016 (253) 838-6113 FINANCIAL GUARANTEE REQUIREMENTS PUBLIC ROAD & DRAINAGE MAINTENANCE/DEFECT BOND* Laura Bartenhagen, P.E. ESM Consulting Engineers, LLC 33400 8th Avenue South, Suite 205, Federal Way, WA 98003 PERFORMANCE BOND* AMOUNT 40111 MINIMUM BOND* AMOUNT REQUIRED FOR RECORDING OR TEMPORARY OCCUPANCY AT SUBSTANTIAL COMPLETION *** 2/15/2016 2,472.9$ Laura Bartenhagen, P.E. 6,038.5$ -$ 9,891.7$ 8,238.4$ (B+C) x 0.25 = 6,038.5$ 11,531.0$ 27,461.2$ Page 9 of 9 bondquantityworksheet.xls Check out the DDES Web site at www.kingcounty.gov/permits Unit prices updated: 03/02/2015 Version: 03/02/2015 Report Date: 5/19/2016