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HomeMy WebLinkAboutRE_Drainage_Technical_Information_Report_250715_v3Patrick E. Carroll, P.E. PEC Design and Consulting LLC 2621 NE 109th Street Vancouver, WA 98686 (503) 849-1646 pat@pecdesign.net Date: August 23, 2022 Rev: March 25, 2025 Rev: June 29, 2025 Subject: Technical Information Report (TIR) – Billings 2 Lot Short Plat, 14103 160th Avenue SE, Renton, WA 98059 Table of Contents: Project Overview Conditions and Requirements Summary / Core Requirements Off Site Analysis Flow Control and Water Quality Facility Analysis and Design Conveyance System Analysis and Design Special Reports and Studies Other Permits ESC Analysis and Design Bond Quantities, Facility Summaries and Declarations of Covenant Operations Manual Special Requirements Project Description: The proposed project will divide the existing 36,469 sf parcel into 2 Lots. An existing single family residence is on the proposed parcel B and a future residence will be constructed on parcel A. A 20-foot- wide access driveway will be constructed to parcel A. A driveway with a fire department required hammer head will be constructed in the future and included in the building permit submittal for the residence. The total new impervious area for the driveway, road improvements on 160th Avenue SE (road asphalt paving, driveway drop and sidewalk improvements) is a total of 6,146 sf. The general grade of the residence site slopes gently to the west. The existing soils consist of fine to medium sand (based upon a geotechnical report from Nelson Geotechnical Associates, Inc. (NGA)), therefore runoff from the new driveway impervious area will flow into a gravel trench infiltration / Bioretention facility adjacent to the 20’ driveway on the south side of the lot in the landscaping area. An overflow for the infiltration / planter bed will be the proposed inlet and into the existing storm system inlet in 160th Ave. SE. The street improvements, and sidewalk will flow into the existing roadside ditch on 160th Ave. SE. The runoff from the future fire turnaround and the proposed residence will flow from to a future infiltration trench area on Parcel A. The individual system design will be provided at time of the building permit application. Under this permit, it is assumed that the only area to be disturbed, will be for the installation of the proposed driveway to parcel A, and for the installation of the street, sidewalk, and driveway drop on 160th Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 Avenue SE. The approximate area to be disturbed during the installation of the improvements is approximately 7,000 sf. No existing native growth areas or significant trees will be disturbed. The proposed site earthwork is estimated as follows. Earthwork Calculations: Access Driveway Exc. = 2,879 sf = 160 cy Residence Exc. = 1,013 sf = 50 cy Total excavation to be spread onsite. = 210 cy. Conditions and Requirements Summary: The following specifics about the site apply: The site will use the City of Renton/King County Stormwater Manual allow for sheet flow from the driveway to the proposed Bioretention facility with an overflow into the existing storm system. Due to the size of the site and area disturbed, a Full Drainage Review format will be used. The following sections address the project as relates to the nine Core Requirements and the five Special Requirements. Core Requirement #1 - Discharge at the Natural Location The impervious areas for the access driveway will flow to the proposed landscape area along the south side of the driveway to Lot 2. The landscape area will have amended soil, and will have an overflow discharge to the existing storm system via the inlet at the east end of the facility near 160th Avenue SE. The stormwater from the proposed residence will flow onto splash blocks then into the amended soil downstream from the residence. Core Requirement #2 – Offsite Analysis There are no identified drainage problems “downstream” of the site. Core Requirement #3 - Flow Control The attached WWHM calculations reflect that the flow difference existing flows (Forested condition) and the mitigated for the proposed project are less than a 0.10 cfs increase in flow therefore the runoff can flow to the landscape area for the access drive, and will utilize splash blocks for the roof runoff and distribute the flow to the amended soil downslope of the residence. The inlet at the east end of the driveway near 160th Avenue will be for overflow discharge for the access road. Core Requirement #4 - Conveyance System The use of PVC pipe for runoff collection and routing to the existing storm system provides accepted and common conveyance practice. Three feet of cover is provided under pavement. Any storm piping under 3 feet of cover will be Ductile Iron Pipe. Core Requirement #5 - Construction Stormwater Pollution Prevention Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 A TESCP Plan is provided integral with the drainage design drawing. The site is small and warrants only the normal placement of a downslope silt fence at its perimeter. A standard stabilized construction entrance BMP is provided for site entrance silt and debris protection of adjacent pavement. Core Requirement #6 - Maintenance and Operations An Operations and Maintenance Manual will be provided as part of the building permit process. A new manual will be provided in Exhibit B of a new Declaration of Covenant which is required by the City of Renton. Core Requirement #7 - Financial Guarantees and Liability The STE and Performance and Maintenance Bonds are required, and a right-of-way driveway installation. Core Requirement #8 - Water Quality The stormwater from the proposed driveway will sheet flow into the landscape area which will serve as a stormwater filter strip. The filter strip will provide the required stormwater treatment. The use of a catch basin with downturned elbows at the discharge overflow to the east will protect from serious oil and other contaminant spills or seeps from vehicular areas. Also, the roof of the residence is considered a non-polluting impervious surface. Core Requirement #9 - Flow Control BMP's Flow control will be obtained by the use of a Bioretention area with infiltration, The LID infiltration trench will infiltrate runoff from the proposed driveway to Lot 2. Core Requirement #10 - Special Reports and Studies: No previous reports or studies have been identified for this site, except for the older and more recent short plat. Copies of these documents were not available for review. Other Permits: Permits for normal residential construction such as plumbing, electrical, etc. will be required. A right- of-way permit is required for driveway installation. Special Requirements for Full Drainage Review: Special Requirement #1 - Other Adopted Requirements - None Special Requirement #2 - Flood Hazard Area - None Special Requirement #3 - Flood Protection - None Special Requirement #4 - Source Control - None Special Requirement #5 - Oil Control - None Flow Control and Water Quality Facility Analysis and Design: Per the Core Requirements above, the stormwater from the impervious roof areas will flow to the existing storm system. Conveyance System Analysis and Design: Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 6” and 4” PVC pipe will be used in all stormwater locations. All slopes will be in excess of 2 percent due to the site topography, and are adequate by inspection. Minimum cover of 3 feet will be provided in any paved or concrete driveway areas. Special Reports and Studies: No special reports of studies were performed for this site. Previous short plat documents were not available for review. Other Permits: No special permits are required for site. The building permits are the only required permits for the construction. ESC Analysis and Design: As noted in the Core Requirements, the site is small and only requires the normal placement of downslope filter fence. A standard stabilized construction entrance will be used at the residence construction site entrance. Bond Quantities, Facility Summaries and Declaration of Covenant: A Declaration of Covenant with attached Operations and Maintenance Manual will be provided if previous documents are not considered applicable. Operations and Maintenance Manual: Provided with the Declaration of Covenant (see above note). Any questions, or comments may be sent via email or mail to the above address. Patrick E. Carroll, P.E. PEC Design and Consulting LLC 2621 NE 109th Street Vancouver, WA 98686 pat@pecdesign.net Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 6/30/2025 WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: 21-1273 Billing SP WWHM File 3 Site Name: Billing SP Site Address: 14103 160th Ave SE City : Renton, WA Report Date: 6/29/2025 Gage : Seatac Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 1.00 Version Date: 2023/01/27 Version : 4.2.19 ___________________________________________________________________ Low Flow Threshold for POC 1 : 50 Percent of the 2 Year ___________________________________________________________________ High Flow Threshold for POC 1: 50 year ___________________________________________________________________ PREDEVELOPED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat .17 Pervious Total 0.17 Impervious Land Use acre Impervious Total 0 Basin Total 0.17 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 Pervious Land Use acre C, Pasture, Flat .16 Pervious Total 0.16 Impervious Land Use acre Impervious Total 0 Basin Total 0.16 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater Surface retention 1 Surface retention 1 ___________________________________________________________________ Name : Bioretention 1 Bottom Length: 240.00 ft. Bottom Width: 3.00 ft. Material thickness of first layer: 3 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 1.5 Material type for second layer: GRAVEL Material thickness of third layer: 0 Material type for third layer: Sand Infiltration On Infiltration rate: 0.75 Infiltration safety factor: 0.25 Wetted surface area On Total Volume Infiltrated (ac-ft.): 8.12 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 8.12 Percent Infiltrated: 100 Total Precip Applied to Facility: 1.468 Total Evap From Facility: 1.687 Underdrain used Underdrain Diameter (feet): 0.667 Orifice Diameter (in.): 8 Offset (in.): 6 Flow Through Underdrain (ac-ft.): 0 Total Outflow (ac-ft.): 8.12 Percent Through Underdrain: 0 Discharge Structure Riser Height: 1 ft. Riser Diameter: 10 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 Bioretention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 430.00 0.1839 0.0000 0.0000 0.0000 430.07 0.1832 0.0005 0.0000 0.0000 430.13 0.1805 0.0011 0.0000 0.0000 430.20 0.1778 0.0018 0.0000 0.0000 430.26 0.1752 0.0025 0.0003 0.0003 430.33 0.1725 0.0033 0.0006 0.0006 430.40 0.1698 0.0042 0.0008 0.0008 430.46 0.1672 0.0051 0.0010 0.0010 430.53 0.1645 0.0061 0.0014 0.0014 430.59 0.1619 0.0072 0.0018 0.0018 430.66 0.1592 0.0083 0.0022 0.0022 430.73 0.1566 0.0096 0.0028 0.0028 430.79 0.1540 0.0108 0.0034 0.0034 430.86 0.1514 0.0122 0.0042 0.0042 430.92 0.1488 0.0136 0.0050 0.0050 430.99 0.1462 0.0151 0.0060 0.0060 431.05 0.1436 0.0166 0.0071 0.0071 431.12 0.1410 0.0183 0.0084 0.0084 431.19 0.1384 0.0200 0.0098 0.0098 431.25 0.1359 0.0217 0.0098 0.0098 431.32 0.1333 0.0236 0.0098 0.0098 431.38 0.1307 0.0255 0.0098 0.0098 431.45 0.1282 0.0275 0.0098 0.0098 431.52 0.1256 0.0295 0.0098 0.0098 431.58 0.1231 0.0316 0.0098 0.0098 431.65 0.1206 0.0338 0.0098 0.0098 431.71 0.1181 0.0361 0.0098 0.0098 431.78 0.1156 0.0384 0.0098 0.0098 431.85 0.1131 0.0408 0.0098 0.0098 431.91 0.1106 0.0433 0.0098 0.0098 431.98 0.1081 0.0459 0.0098 0.0098 432.04 0.1056 0.0485 0.0098 0.0098 432.11 0.1031 0.0512 0.0098 0.0098 432.18 0.1006 0.0540 0.0098 0.0098 432.24 0.0982 0.0568 0.0098 0.0098 432.31 0.0957 0.0597 0.0099 0.0099 432.37 0.0933 0.0627 0.0114 0.0114 432.44 0.0908 0.0658 0.0130 0.0130 432.51 0.0884 0.0690 0.0148 0.0148 432.57 0.0860 0.0722 0.0168 0.0168 432.64 0.0836 0.0755 0.0190 0.0190 432.70 0.0811 0.0789 0.0214 0.0214 432.77 0.0787 0.0823 0.0214 0.0214 432.84 0.0763 0.0858 0.0214 0.0214 432.90 0.0739 0.0894 0.0214 0.0214 432.97 0.0716 0.0931 0.0220 0.0220 433.03 0.0692 0.0965 0.0238 0.0238 433.10 0.0668 0.1000 0.0238 0.0238 433.16 0.0645 0.1035 0.0238 0.0238 433.23 0.0621 0.1071 0.0252 0.0252 433.30 0.0598 0.1108 0.0252 0.0252 433.36 0.0574 0.1146 0.0252 0.0252 433.43 0.0551 0.1184 0.0253 0.0253 433.49 0.0528 0.1223 0.0271 0.0271 433.56 0.0504 0.1262 0.0276 0.0276 Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 433.63 0.0481 0.1303 0.0276 0.0276 433.69 0.0458 0.1344 0.0276 0.0276 433.76 0.0435 0.1386 0.0290 0.0290 433.82 0.0412 0.1428 0.0296 0.0296 433.89 0.0390 0.1471 0.0301 0.0301 433.96 0.0367 0.1515 0.0306 0.0306 434.02 0.0344 0.1560 0.0311 0.0311 434.09 0.0322 0.1605 0.0312 0.0312 434.15 0.0299 0.1651 0.0312 0.0312 434.22 0.0277 0.1698 0.0315 0.0315 434.29 0.0254 0.1746 0.0325 0.0325 434.35 0.0232 0.1794 0.0325 0.0325 434.42 0.0210 0.1843 0.0325 0.0325 434.48 0.0187 0.1893 0.0325 0.0325 434.50 0.0165 0.1905 0.0325 0.0325 Surface retention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 4.5000 0.1839 0.1905 0.0000 1.1288 0.0005 4.5659 0.1866 0.2028 0.0000 1.1288 0.0010 4.6319 0.1893 0.2151 0.0000 1.1956 0.0015 4.6978 0.1920 0.2277 0.0000 1.2382 0.0021 4.7637 0.1947 0.2405 0.0000 1.2817 0.0026 4.8297 0.1975 0.2534 0.0000 1.3259 0.0031 4.8956 0.2002 0.2665 0.0000 1.3709 0.0036 4.9615 0.2029 0.2798 0.0000 1.4167 0.0041 5.0275 0.2057 0.2933 0.0000 1.4632 0.0046 5.0934 0.2085 0.3069 0.0000 1.4833 0.0052 5.1593 0.2112 0.3208 0.0000 1.4833 0.0057 5.2253 0.2140 0.3348 0.0000 1.4833 0.0062 5.2912 0.2168 0.3490 0.0000 1.4833 0.0067 5.3571 0.2196 0.3634 0.0000 1.4833 0.0073 5.4231 0.2224 0.3779 0.0000 1.4833 0.0078 5.4890 0.2252 0.3927 0.0000 1.4833 0.0083 5.5549 0.2280 0.4076 0.0000 1.4833 0.0089 5.6209 0.2308 0.4227 0.0000 1.4833 0.0094 5.6868 0.2336 0.4380 0.0000 1.4833 0.0099 5.7527 0.2364 0.4535 0.0016 1.4833 0.0105 5.8187 0.2393 0.4692 0.0033 1.4833 0.0110 5.8846 0.2421 0.4851 0.0068 1.4833 0.0115 5.9505 0.2450 0.5012 0.0109 1.4833 0.0120 6.0000 0.2471 0.5133 0.0157 1.4833 0.0000 ___________________________________________________________________ Name : Surface retention 1 Element Flows To: Outlet 1 Outlet 2 Bioretention 1 ___________________________________________________________________ ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.17 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0.16 Total Impervious Area:0 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.004998 5 year 0.00785 10 year 0.009466 25 year 0.011178 50 year 0.012237 100 year 0.013138 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.005608 5 year 0.009628 10 year 0.012849 25 year 0.017559 50 year 0.021538 100 year 0.025926 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.005 0.008 1950 0.006 0.009 1951 0.011 0.011 1952 0.003 0.004 1953 0.003 0.003 1954 0.004 0.005 1955 0.007 0.007 1956 0.005 0.006 1957 0.004 0.005 1958 0.005 0.005 1959 0.004 0.004 1960 0.007 0.009 1961 0.004 0.004 1962 0.003 0.003 1963 0.004 0.004 1964 0.005 0.006 1965 0.003 0.004 1966 0.003 0.004 1967 0.007 0.009 1968 0.004 0.005 1969 0.004 0.005 1970 0.003 0.004 Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 1971 0.004 0.005 1972 0.008 0.009 1973 0.004 0.004 1974 0.004 0.005 1975 0.005 0.007 1976 0.004 0.005 1977 0.000 0.001 1978 0.003 0.004 1979 0.002 0.002 1980 0.008 0.014 1981 0.003 0.004 1982 0.006 0.010 1983 0.005 0.006 1984 0.003 0.004 1985 0.002 0.002 1986 0.009 0.009 1987 0.008 0.008 1988 0.003 0.004 1989 0.002 0.002 1990 0.016 0.028 1991 0.010 0.011 1992 0.004 0.005 1993 0.004 0.004 1994 0.001 0.002 1995 0.006 0.006 1996 0.012 0.014 1997 0.010 0.011 1998 0.002 0.004 1999 0.009 0.017 2000 0.004 0.004 2001 0.001 0.001 2002 0.004 0.006 2003 0.005 0.009 2004 0.007 0.009 2005 0.005 0.006 2006 0.006 0.006 2007 0.012 0.023 2008 0.015 0.020 2009 0.008 0.009 ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0160 0.0280 2 0.0153 0.0228 3 0.0119 0.0196 4 0.0117 0.0174 5 0.0110 0.0143 6 0.0098 0.0141 7 0.0096 0.0113 8 0.0092 0.0111 9 0.0087 0.0106 10 0.0082 0.0095 11 0.0078 0.0092 12 0.0077 0.0091 13 0.0075 0.0090 Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 14 0.0074 0.0090 15 0.0070 0.0089 16 0.0069 0.0087 17 0.0068 0.0087 18 0.0061 0.0086 19 0.0060 0.0084 20 0.0059 0.0076 21 0.0056 0.0071 22 0.0055 0.0067 23 0.0055 0.0063 24 0.0054 0.0062 25 0.0054 0.0060 26 0.0050 0.0060 27 0.0050 0.0059 28 0.0049 0.0056 29 0.0047 0.0056 30 0.0044 0.0054 31 0.0043 0.0053 32 0.0043 0.0052 33 0.0042 0.0050 34 0.0042 0.0050 35 0.0042 0.0049 36 0.0041 0.0049 37 0.0040 0.0046 38 0.0040 0.0046 39 0.0039 0.0045 40 0.0039 0.0044 41 0.0037 0.0043 42 0.0037 0.0043 43 0.0037 0.0042 44 0.0036 0.0041 45 0.0035 0.0041 46 0.0035 0.0040 47 0.0034 0.0039 48 0.0034 0.0039 49 0.0033 0.0037 50 0.0032 0.0036 51 0.0031 0.0036 52 0.0030 0.0036 53 0.0028 0.0035 54 0.0026 0.0031 55 0.0022 0.0029 56 0.0021 0.0025 57 0.0020 0.0023 58 0.0020 0.0022 59 0.0013 0.0018 60 0.0007 0.0014 61 0.0005 0.0011 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility FAILED Facility FAILED duration standard for 1+ flows. Flow(cfs) Predev Mit Percentage Pass/Fail Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 0.0025 17547 22587 128 Fail 0.0026 16164 20685 127 Fail 0.0027 14972 18891 126 Fail 0.0028 13851 17299 124 Fail 0.0029 12816 15962 124 Fail 0.0030 11813 14782 125 Fail 0.0031 10900 13815 126 Fail 0.0032 10121 12788 126 Fail 0.0033 9390 11785 125 Fail 0.0034 8731 10923 125 Fail 0.0035 8147 10123 124 Fail 0.0036 7593 9409 123 Fail 0.0037 7060 8733 123 Fail 0.0038 6590 8143 123 Fail 0.0039 6145 7606 123 Fail 0.0040 5777 7099 122 Fail 0.0041 5433 6607 121 Fail 0.0042 5097 6196 121 Fail 0.0043 4808 5794 120 Fail 0.0044 4528 5465 120 Fail 0.0045 4252 5157 121 Fail 0.0046 4017 4834 120 Fail 0.0047 3782 4581 121 Fail 0.0048 3546 4323 121 Fail 0.0049 3339 4092 122 Fail 0.0050 3138 3844 122 Fail 0.0051 2952 3602 122 Fail 0.0052 2787 3403 122 Fail 0.0053 2599 3191 122 Fail 0.0054 2447 2988 122 Fail 0.0054 2306 2817 122 Fail 0.0055 2160 2654 122 Fail 0.0056 2026 2494 123 Fail 0.0057 1898 2366 124 Fail 0.0058 1790 2222 124 Fail 0.0059 1688 2090 123 Fail 0.0060 1584 1964 123 Fail 0.0061 1483 1872 126 Fail 0.0062 1381 1783 129 Fail 0.0063 1292 1695 131 Fail 0.0064 1219 1599 131 Fail 0.0065 1155 1499 129 Fail 0.0066 1098 1401 127 Fail 0.0067 1048 1304 124 Fail 0.0068 997 1240 124 Fail 0.0069 930 1175 126 Fail 0.0070 883 1126 127 Fail 0.0071 837 1075 128 Fail 0.0072 789 1020 129 Fail 0.0073 743 976 131 Fail 0.0074 713 937 131 Fail 0.0075 668 896 134 Fail 0.0076 631 855 135 Fail 0.0077 595 804 135 Fail 0.0078 565 769 136 Fail 0.0079 539 728 135 Fail 0.0080 496 682 137 Fail Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 0.0081 473 643 135 Fail 0.0082 434 600 138 Fail 0.0083 399 547 137 Fail 0.0084 366 487 133 Fail 0.0085 348 455 130 Fail 0.0086 323 417 129 Fail 0.0087 296 390 131 Fail 0.0088 272 362 133 Fail 0.0089 256 340 132 Fail 0.0090 235 318 135 Fail 0.0091 217 294 135 Fail 0.0092 195 272 139 Fail 0.0093 180 250 138 Fail 0.0094 158 228 144 Fail 0.0095 145 203 140 Fail 0.0096 129 184 142 Fail 0.0097 119 167 140 Fail 0.0098 109 155 142 Fail 0.0099 97 145 149 Fail 0.0100 91 129 141 Fail 0.0101 82 123 150 Fail 0.0102 76 112 147 Fail 0.0103 69 103 149 Fail 0.0104 62 93 150 Fail 0.0105 55 88 160 Fail 0.0106 48 80 166 Fail 0.0107 41 74 180 Fail 0.0108 38 67 176 Fail 0.0109 33 65 196 Fail 0.0110 27 59 218 Fail 0.0111 22 51 231 Fail 0.0112 21 48 228 Fail 0.0113 20 47 234 Fail 0.0114 19 43 226 Fail 0.0115 17 40 235 Fail 0.0115 14 39 278 Fail 0.0116 12 38 316 Fail 0.0117 9 32 355 Fail 0.0118 4 28 700 Fail 0.0119 3 27 900 Fail 0.0120 3 26 866 Fail 0.0121 3 25 833 Fail 0.0122 3 23 766 Fail _____________________________________________________ The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. ___________________________________________________________________ Water Quality BMP Flow and Volume for POC #1 On-line facility volume: 0 acre-feet On-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Off-line facility target flow: 0 cfs. Adjusted for 15 min: 0 cfs. Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7 ___________________________________________________________________ LID Report LID Technique Used for Total Volume Volume Infiltration Cumulative Percent Water Quality Percent Comment Treatment? Needs Through Volume Volume Volume Water Quality Treatment Facility (ac-ft.) Infiltration Infiltrated Treated (ac-ft) (ac-ft) Credit Total Volume Infiltrated 0.00 0.00 0.00 0.00 0.00 0% No Treat. Credit Compliance with LID Standard 8 Duration Analysis Result = Failed ___________________________________________________________________ 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. 2005-2025; All Rights Reserved. Docusign Envelope ID: 67578F12-4E12-4A75-9D23-FDDA4BCE62A7