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BLD2021-00301 - 05 Drainage Report 2021-04-12
P.O. Box 720 10045 Old Frontier Road NW Silverdale, Washington 98383 (360) 692-5525 Seattle (206) 682-5574 www.map-limited.com ENGINEERING SURVEYING PLANNING DRAINAGE REPORT FOR PORT TOWNSEND U-HAUL NE ¼, SW ¼ and SW ¼ , NW ¼ SECTION 6, TOWNSHIP 26 NORTH, RANGE 1 EAST, W.M. PROJECT ENGINEER: Mark W. Eisses, P.E. MAP, Ltd. (6589) PREPARED FOR: Modular Mini-Storage P.O. Box 2353 Tualatin, OR 97062 Terry Wellner (503) 522-9610 CONTACT: Kerry Chamberlin, Sr. Construction Mgr. FPH Construction, Inc. 2540 Cascades Pass Blvd., Suite 200 Bremerton, WA 98312 (360) 479-4137 DATE: April 12, 2021 April 12, 2021 NOTE: THIS DOCUMENT IS INSCRIBED WITH A DIGITIZED SIGNATURE BY THE ENGINEER AS PROVIDED BY WAC 196-23-070 (2). REFERENCES Stormwater Management Manual for Western Washington. Washington State Department of Ecology, 2019 USDA Natural Resources Conservation Services National Cooperative Soil Survey Western Washington Hydrology Model 2012. Clear Creek Solutions, 2021 PORT TOWNSEND U-HAUL J# 6589 Contents I. PROJECT OVERVIEW ___________________________________________________1 A. RELEVANT PROJECT BACKGROUND ________________________________________1 B. PROJECT DESCRIPTION ___________________________________________________1 C. FOLLOWING MINIMUM REQUIREMENTS ____________________________________1 a) Minimum Requirement #1: Preparation of Stormwater Site Plans ________________________________ 1 b) Minimum Requirement #2: Construction Stormwater Pollution Prevention (SWPP)__________________ 1 c) Minimum Requirement #3: Source Control of Pollution _______________________________________ 1 d) Outfalls ______________________________________________________________________________ 2 e) Minimum Requirement #5: On-site Stormwater Management ___________________________________ 2 i. Lawn and Landscaped areas: _____________________________________________________________ 2 ii. Roofs: _______________________________________________________________________________ 2 iii. Other Hard Surfaces ____________________________________________________________________ 2 f) Minimum Requirement #6: Runoff Treatment ________________________________________________ 3 g) Minimum Requirement: #7: Flow Control ___________________________________________________ 3 h) Minimum Requirement #8 Wetland Protection _______________________________________________ 3 i) Minimum Requirement #9: Operation & Maintenance _________________________________________ 3 II. DESIGN STANDARDS ____________________________________________________3 III. EXISTING SITE CONDITIONS __________________________________________3 A. TOPOGRAPHY AND FEATURES _____________________________________________3 B. OFF-SITE DRAINAGE ______________________________________________________3 C. EXISTING DRAINAGE ______________________________________________________3 D. SENSITIVE AREAS _________________________________________________________4 E. EXISTING VEGETATION ___________________________________________________4 F. EXISTING ON-SITE DRAINAGE PROBLEMS ___________________________________4 G. EXISTING OFF-SITE DRAINAGE PROBLEMS __________________________________4 H. GENERAL SOIL AND GROUNDWATER CONDITIONS ___________________________4 IV. PROPOSED SITE CONDITIONS _________________________________________4 A. PROPOSED DEVELOPMENT ________________________________________________4 a. Developed Basin Map __________________________________________________________________ 5 B. POTENTIAL STORM WATER IMPACTS _______________________________________6 C. PROPOSED PERMANENT STORM WATER MANAGEMENT ______________________6 V. HYDROLOGIC ANALYSIS ________________________________________________6 A. NORTH ASPHALT INFILTRATION SYSTEMS ___________________________________6 a. Infiltration Trench #1Report _____________________________________________________________ 6 B. AREA #1 WATER QUALITY _________________________________________________14 PORT TOWNSEND U-HAUL J# 6589 a. Water Quality for Perkfilter Report _______________________________________________________ 15 C. PERVIOUS GRAVEL ______________________________________________________17 a. Pervious Gravel Report ________________________________________________________________ 17 A. BIORETENTION CELL #1 __________________________________________________26 a. Bioretention#1 Cell WWHM Report ______________________________________________________ 26 B. INFILTRATION SYSTEM #2 ________________________________________________28 a. Infiltration Trench #1Report ____________________________________________________________ 28 C. BIORETENTION CELL #2 __________________________________________________36 a) Bioretention Cell #2 WWHM Report ______________________________________________________ 36 D. INFILTRATION SYSTEM #3 ________________________________________________45 a. Infiltration Trench #3Report ____________________________________________________________ 45 VI. SILT AND EROSION CONTROL ________________________________________54 PORT TOWNSEND U-HAUL J# 6589 1 | P a g e DRAINAGE REPORT FOR PORT TOWNSEND U-HAUL I. PROJECT OVERVIEW A. RELEVANT PROJECT BACKGROUND The 8.44-acre site is in Jefferson County at 14082 Airport Cutoff Road. The site was previously used as a car dealership. The applicant, Modular Mini-Storage of Tualatin, Oregon, is proposing to develop the site as a U-Haul Facility. The existing 9,853 square foot building will remain. Also, the existing asphalt and a gravel parking area south of the existing building will remain. B. PROJECT DESCRIPTION The proposal includes construction of 8 structures (65,015 square feet total) for mini storage. There will also be 4 gravel parking areas for RV’s, boats, etc along with two other gravel parking areas for U-Haul vehicles to park. Access into the site is via an existing access at the south end of the site and the access will remain. Minimum Requirements #1 through #9 apply to the new hard surfaces and the disturbed area. C. FOLLOWING MINIMUM REQUIREMENTS a) Minimum Requirement #1: Preparation of Stormwater Site Plans The Stormwater Site Plans are included with the plan set. These plan shows the intent for grading and drainage of the site with existing and proposed stormwater improvements to be implemented as part of the re-development proposed with this project. b) Minimum Requirement #2: Construction Stormwater Pollution Prevention (SWPP) A Silt and Erosion Control Plan is submitted with the construction drawings that complies with SWPP requirements #1 through #13. A Stormwater Pollution Prevention Narrative is included with the submittal of this project. Silt and erosion control measures will include siltation control ditches, a series of earthen dikes and sediment traps to prevent silt laden runoff from leaving the site. This project is subject to a Construction Storwmwater General Permit from the Washington State Department of Ecology prior to any on-site activity. All clearing limits will be clearly flagged. c) Minimum Requirement #3: Source Control of Pollution There are two categories of source control BMPs, operational and structural. Operational source control BMPs are non-structural practices that prevent or reduce pollutants from entering stormwater. Examples include formation of a pollution prevention team, good PORT TOWNSEND U-HAUL J# 6589 2 | P a g e housekeeping practices, preventive maintenance procedures, spill prevention and cleanup, employee training, inspections of pollutant sources and record keeping. A Stormwater Operations and Maintenance Manual will be provided for this project with maintenance standards and record keeping checklists. d) Outfalls The site is comprised of soils that are highly infiltrative. The project is proposing to infiltrate 100% of the runoff from rooftop areas. Bioretention cells will provide stormwater management for the new asphalt surfaces. Pervious gravel parking will be provided in the southeast corner of the site, and pervious gravel will be provided for a portion of the driveways in the easterly portion of the site. There is an overflow provided for the pervious gravel and it is modeled as impervious area for purposes of the design. It will have any surface runoff directed to Bioretention #1 and Infiltration System #2. e) Minimum Requirement #5: On-site Stormwater Management The BMP’s to be considered for this site are determined for Feasibility determined by evaluation against: Design criteria, limitations and infeasibility criteria identified in each BMP in the 2012/2014 WSDOE Manual; and Competing Needs Criteria listed in Chapter 5 of Volume 5 of the 2012 WSDOE Manual. i. Lawn and Landscaped areas: · Post-Construction Soil Quality and Depth in Accordance with BMP T5.13 of Volume 5 Soil amendment will be provided for all disturbed areas to be landscaped with slopes of less than or equal to 25% in grade. The slope areas will be seeded and mulched. ii. Roofs: · Full dispersion or Full Infiltration: Runoff from the rooftops will be directed to Infiltration System # and Infiltration System #2Rain Gardens: N/A · Downspout dispersion: N/A · Perforated stub-out connections: N/A iii. Other Hard Surfaces · Full Dispersion: Full dispersion is not feasible on this site due to project density that complies with the zoning code of the GC Zone. · Rain Gardens: The asphalt impervious surfaces in the south basin will drain to engineered bioretention cells to provide flow control and water quality mitigation. · Permeable pavement: The applicant is proposing to provide pervious gravel parking and pervious gravel driveways for areas along the east side of the new developed area. An overflow system is provided to direct runoff to Bioretenion System #1 and Infiltration System #2. · Sheet flow dispersion: Full dispersion is not feasible on this site due to project density that complies with the zoning code of the GC Zone.. Infiltration System #1 and Infiltrion System #2 The applicant is proposing to provide pervious gravel parking and pervious gravel drivways in the east side of the project. This pervious area is provided to meet the zoning code for maximum impervious area of 60% for the developed site. An overflow system is provided. PORT TOWNSEND U-HAUL J# 6589 3 | P a g e f) Minimum Requirement #6: Runoff Treatment Runoff treatment for the asphalt drive aisles in the north part of the project will have a PerkFilter™ , proprietary treatment system with GULD designation by the Washington State Department of Ecology (WSDOE). Runoff treatment for the new asphalt drive aisles in the rest of the site will be provided with bioretention an LID BMP. g) Minimum Requirement: #7: Flow Control Flow control measures for the site will be achieved through LID measures, including infiltration, pervious gravel pavement and engineered bioretention cells. h) Minimum Requirement #8 Wetland Protection Not applicable to this project. i) Minimum Requirement #9: Operation & Maintenance An O&M Manual will be provided at the end of construction and will include Record Drawings of the site. II. DESIGN STANDARDS The design standards used for this project were based on the requirements of the Jefferson County. The modeling for all drainage systems was performed using the WWHM2012, current version. The WSDOE’s 2014 WWSWMM was used for on design of all drainage systems. WSDOT was the reference for miscellaneous site and drainage improvements. III. EXISTING SITE CONDITIONS A. TOPOGRAPHY AND FEATURES . The site was cleared most likely when the car dealership was developed in the past. There is an existing building in the center of the site along west side of the lot. There is also a paved area with existing on-site parking. There is a portion of the site that has been covered with gravel in the north part of the site and throughout the central portion of the site. These areas will be re- graded for the site improvements. B. OFF-SITE DRAINAGE The northeast portion of the site is at a local high spot, however, there is some localized runoff from the adjacent properties to the north and east. These areas have significant native vegetation, and as this area has minimal rainfall, and infiltrative soils, there is no major source of runoff from upstream properties. A french drain is proposed, per the Geotechnical Engineer’s recommendations, to intercept any potential for upstream flows negatively affecting the proposed drainage/infiltration systems. C. EXISTING DRAINAGE The majority of this site will infiltrate to native soils. The off-site flows from the interceptor drain will be directed to the existing ditch along the east side of Airport Cutoff Road. Ditch flow continues south. Flow control and water quality measures, including LID infiltration and bioretention, will mitigate all impact to the downstream drainage course. There are no known 2019 The runoff from the developed site will infiltrate to native soils. Ditch flow along the East side of Airport Cutoff Road is directed to the south. Flow control and water quality measures, including infiltration and bioretention will mitigate all impact to the downstream drainage course. There are no known problems in the downstream drainage course, nor are any anticipated as a result of this project. PORT TOWNSEND U-HAUL J# 6589 4 | P a g e problems in the downstream drainage course, and no adverse effects are anticipated to the downstream drainage course following development of the site. . D. SENSITIVE AREAS There are no known sensitive areas associated with this site. E. EXISTING VEGETATION The site was cleared most likely when the car dealership was developed in the past. On-site vegetation is primarily scotch broom and blackberries. F. EXISTING ON-SITE DRAINAGE PROBLEMS There are no known drainage or erosion problems associated with this site. G. EXISTING OFF-SITE DRAINAGE PROBLEMS The Geotech has recommended that an interceptor drain be placed at the eastern and northern edge of the site, to capture groundwater that may be seeping onto the site from upslope. This interceptor drain is shown on the plans. H. GENERAL SOIL AND GROUNDWATER CONDITIONS According to the USDA Natural Resources Conservation Service National Cooperative Soil Survey on site soils are classified as Hoypus gravelly sandy loam, and Hydrologic Soil Group “A”. Please refer to the Geotechnical Engineering Report for detailed information related to the on-site soils encountered during soils investigation previously provided. IV. PROPOSED SITE CONDITIONS A. PROPOSED DEVELOPMENT The existing building will remain with the existing asphalt. The existing building is 9,920 s.f., existing asphalt is 41,615 s.f. A portion of the existing gravel parking will remain, 13,424 s.f., and existing concrete 2,560 s.f. There will be no disturbance of these areas, however they are included in the impervious area to meet Jefferson County code requirements for a maximum of 60% impervious area on the property. The improvements will include: 8 new buildings totaling 65,015 s.f.; new asphalt 73,445 s.f. in area; pervious gravel parking is 52,054 s.f. in area and pervious gravel drive aisles area 29,987 s.f.; landscape area of 95373 s.f. The project will result in 205,979 s.f. of total impervious area that is 53.7% of the 368,393 s.f. parcel. This exceeds the requirement for a maximum impervious area of 60% PORT TOWNSEND U-HAUL J# 6589 5 | P a g e a. Developed Basin Map PORT TOWNSEND U-HAUL J# 6589 6 | P a g e B. POTENTIAL STORM WATER IMPACTS The development will have minimal impact as all developed impervious runoff from the site will be retained on site by various LID management techniques. C. PROPOSED PERMANENT STORM WATER MANAGEMENT Stormwater management will be provided through a variety of LID Best Management Practices. Rootop runoff will be directed to rooftop infiltration systems. Impervious asphalt surfaces will drain to engineered bioretention cells designed for flow control and water quality mitigation. V. HYDROLOGIC ANALYSIS A. NORTH ASPHALT INFILTRATION SYSTEMS The north area of impervious asphalt and rooftop runoff from buildings A -F drain toward Infiltration System #1. The infiltration system is located west of Building A in a gravel parking area. The infiltration rate of 5 inches per hour was determined based on small PIT tests conducted by the Geotechnical Engineer. This infiltration rate was provided with all correction factors determined by the Geotechnical Engineer (Terracon.) The area draining to the infiltration system is 94,414 square feet or 2.17 acres. The infiltration system consists of 414 linear feet of 60” perforated corrugated metal tank in a rock lined trench. Access risers will be placed so that tank access within the tank is no less than 50 feet from each access point. The peak stage is 4.3’, providing 0.7’ of freeboard. a. Infiltration Trench #1Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: INFILTRATION NORTH 3-21 Site Name: 6589 UHAUL Site Address: AIRPORT CUTOFF ROAD City : Report Date: 3/28/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ Low Flow Threshold for POC 1 : 50 Percent of the 2 Year ___________________________________________________________________ High Flow Threshold for POC 1: 50 year ___________________________________________________________________ PREDEVELOPED LAND USE Name : EXISTING NORTH BASIN Bypass: No GroundWater: No Pervious Land Use acre A B, Forest, Mod 2.17 PORT TOWNSEND U-HAUL J# 6589 7 | P a g e Pervious Total 2.17 Impervious Land Use acre Impervious Total 0 Basin Total 2.17 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROADS FLAT 1.08 ROOF TOPS FLAT 1.09 Impervious Total 2.17 Basin Total 2.17 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater Tank 1 Tank 1 ___________________________________________________________________ Name : Tank 1 Tank Name: Tank 1 Dimensions Depth: 5 ft. Tank Type : Circular Diameter : 5 ft. Length : 414 ft. Infiltration On Infiltration rate: 5 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 156.743 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 156.743 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 5 ft. Riser Diameter: 1000 in. Element Flows To: PORT TOWNSEND U-HAUL J# 6589 8 | P a g e Outlet 1 Outlet 2 ___________________________________________________________________ Tank Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000 0.000 0.000 0.000 0.0556 0.010 0.000 0.000 0.050 0.1111 0.014 0.001 0.000 0.070 0.1667 0.017 0.001 0.000 0.086 0.2222 0.019 0.002 0.000 0.098 0.2778 0.021 0.004 0.000 0.109 0.3333 0.023 0.005 0.000 0.119 0.3889 0.025 0.006 0.000 0.128 0.4444 0.027 0.008 0.000 0.136 0.5000 0.028 0.009 0.000 0.143 0.5556 0.029 0.011 0.000 0.150 0.6111 0.031 0.013 0.000 0.156 0.6667 0.032 0.014 0.000 0.162 0.7222 0.033 0.016 0.000 0.168 0.7778 0.034 0.018 0.000 0.173 0.8333 0.035 0.020 0.000 0.178 0.8889 0.036 0.022 0.000 0.183 0.9444 0.037 0.024 0.000 0.187 1.0000 0.038 0.026 0.000 0.191 1.0556 0.038 0.028 0.000 0.195 1.1111 0.039 0.030 0.000 0.199 1.1667 0.040 0.033 0.000 0.202 1.2222 0.040 0.035 0.000 0.205 1.2778 0.041 0.037 0.000 0.209 1.3333 0.042 0.039 0.000 0.211 1.3889 0.042 0.042 0.000 0.214 1.4444 0.043 0.044 0.000 0.217 1.5000 0.043 0.047 0.000 0.219 1.5556 0.044 0.049 0.000 0.221 1.6111 0.044 0.052 0.000 0.223 1.6667 0.044 0.054 0.000 0.225 1.7222 0.045 0.057 0.000 0.227 1.7778 0.045 0.059 0.000 0.229 1.8333 0.045 0.062 0.000 0.230 1.8889 0.046 0.064 0.000 0.232 1.9444 0.046 0.067 0.000 0.233 2.0000 0.046 0.069 0.000 0.234 2.0556 0.046 0.072 0.000 0.235 2.1111 0.046 0.074 0.000 0.236 2.1667 0.047 0.077 0.000 0.237 2.2222 0.047 0.080 0.000 0.238 2.2778 0.047 0.082 0.000 0.238 2.3333 0.047 0.085 0.000 0.239 2.3889 0.047 0.088 0.000 0.239 2.4444 0.047 0.090 0.000 0.239 2.5000 0.047 0.093 0.000 0.239 2.5556 0.047 0.095 0.000 0.239 2.6111 0.047 0.098 0.000 0.239 2.6667 0.047 0.101 0.000 0.239 2.7222 0.047 0.103 0.000 0.239 2.7778 0.047 0.106 0.000 0.239 2.8333 0.047 0.109 0.000 0.239 2.8889 0.046 0.111 0.000 0.239 PORT TOWNSEND U-HAUL J# 6589 9 | P a g e 2.9444 0.046 0.114 0.000 0.239 3.0000 0.046 0.116 0.000 0.239 3.0556 0.046 0.119 0.000 0.239 3.1111 0.046 0.122 0.000 0.239 3.1667 0.045 0.124 0.000 0.239 3.2222 0.045 0.127 0.000 0.239 3.2778 0.045 0.129 0.000 0.239 3.3333 0.044 0.132 0.000 0.239 3.3889 0.044 0.134 0.000 0.239 3.4444 0.044 0.137 0.000 0.239 3.5000 0.043 0.139 0.000 0.239 3.5556 0.043 0.141 0.000 0.239 3.6111 0.042 0.144 0.000 0.239 3.6667 0.042 0.146 0.000 0.239 3.7222 0.041 0.149 0.000 0.239 3.7778 0.040 0.151 0.000 0.239 3.8333 0.040 0.153 0.000 0.239 3.8889 0.039 0.155 0.000 0.239 3.9444 0.038 0.157 0.000 0.239 4.0000 0.038 0.160 0.000 0.239 4.0556 0.037 0.162 0.000 0.239 4.1111 0.036 0.164 0.000 0.239 4.1667 0.035 0.166 0.000 0.239 4.2222 0.034 0.168 0.000 0.239 4.2778 0.033 0.170 0.000 0.239 4.3333 0.032 0.171 0.000 0.239 4.3889 0.031 0.173 0.000 0.239 4.4444 0.029 0.175 0.000 0.239 4.5000 0.028 0.176 0.000 0.239 4.5556 0.027 0.178 0.000 0.239 4.6111 0.025 0.179 0.000 0.239 4.6667 0.023 0.181 0.000 0.239 4.7222 0.021 0.182 0.000 0.239 4.7778 0.019 0.183 0.000 0.239 4.8333 0.017 0.184 0.000 0.239 4.8889 0.014 0.185 0.000 0.239 4.9444 0.010 0.186 0.000 0.239 5.0000 0.000 0.186 0.000 0.239 5.0556 0.000 0.000 11.59 0.239 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:2.17 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:2.17 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.001215 5 year 0.001691 10 year 0.001932 PORT TOWNSEND U-HAUL J# 6589 10 | P a g e 25 year 0.002166 50 year 0.002302 100 year 0.002411 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.002 0.000 1950 0.001 0.000 1951 0.001 0.000 1952 0.001 0.000 1953 0.002 0.000 1954 0.002 0.000 1955 0.002 0.000 1956 0.001 0.000 1957 0.001 0.000 1958 0.001 0.000 1959 0.001 0.000 1960 0.002 0.000 1961 0.002 0.000 1962 0.001 0.000 1963 0.001 0.000 1964 0.002 0.000 1965 0.002 0.000 1966 0.001 0.000 1967 0.001 0.000 1968 0.001 0.000 1969 0.001 0.000 1970 0.001 0.000 1971 0.001 0.000 1972 0.001 0.000 1973 0.001 0.000 1974 0.000 0.000 1975 0.001 0.000 1976 0.001 0.000 1977 0.001 0.000 1978 0.001 0.000 1979 0.001 0.000 1980 0.002 0.000 1981 0.002 0.000 1982 0.002 0.000 1983 0.001 0.000 1984 0.001 0.000 1985 0.002 0.000 1986 0.001 0.000 1987 0.001 0.000 1988 0.001 0.000 1989 0.001 0.000 PORT TOWNSEND U-HAUL J# 6589 11 | P a g e 1990 0.001 0.000 1991 0.001 0.000 1992 0.001 0.000 1993 0.001 0.000 1994 0.000 0.000 1995 0.001 0.000 1996 0.002 0.000 1997 0.001 0.000 1998 0.000 0.000 1999 0.002 0.000 2000 0.002 0.000 2001 0.000 0.000 2002 0.002 0.000 2003 0.001 0.000 2004 0.002 0.000 2005 0.002 0.000 2006 0.002 0.000 2007 0.002 0.000 2008 0.001 0.000 2009 0.001 0.000 ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0017 0.0000 2 0.0017 0.0000 3 0.0017 0.0000 4 0.0017 0.0000 5 0.0017 0.0000 6 0.0017 0.0000 7 0.0016 0.0000 8 0.0016 0.0000 9 0.0016 0.0000 10 0.0016 0.0000 11 0.0016 0.0000 12 0.0016 0.0000 13 0.0016 0.0000 14 0.0016 0.0000 15 0.0016 0.0000 16 0.0016 0.0000 17 0.0016 0.0000 18 0.0015 0.0000 19 0.0015 0.0000 20 0.0015 0.0000 21 0.0015 0.0000 22 0.0015 0.0000 23 0.0015 0.0000 24 0.0014 0.0000 25 0.0014 0.0000 26 0.0014 0.0000 27 0.0014 0.0000 28 0.0014 0.0000 29 0.0014 0.0000 30 0.0013 0.0000 31 0.0013 0.0000 32 0.0013 0.0000 33 0.0013 0.0000 PORT TOWNSEND U-HAUL J# 6589 12 | P a g e 34 0.0013 0.0000 35 0.0012 0.0000 36 0.0012 0.0000 37 0.0012 0.0000 38 0.0012 0.0000 39 0.0011 0.0000 40 0.0011 0.0000 41 0.0011 0.0000 42 0.0011 0.0000 43 0.0011 0.0000 44 0.0009 0.0000 45 0.0009 0.0000 46 0.0009 0.0000 47 0.0009 0.0000 48 0.0009 0.0000 49 0.0009 0.0000 50 0.0009 0.0000 51 0.0009 0.0000 52 0.0008 0.0000 53 0.0008 0.0000 54 0.0007 0.0000 55 0.0007 0.0000 56 0.0006 0.0000 57 0.0005 0.0000 58 0.0004 0.0000 59 0.0004 0.0000 60 0.0002 0.0000 61 0.0002 0.0000 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0006 530 0 0 Pass 0.0006 507 0 0 Pass 0.0006 480 0 0 Pass 0.0007 459 0 0 Pass 0.0007 435 0 0 Pass 0.0007 409 0 0 Pass 0.0007 383 0 0 Pass 0.0007 368 0 0 Pass 0.0007 348 0 0 Pass 0.0008 330 0 0 Pass 0.0008 322 0 0 Pass 0.0008 309 0 0 Pass 0.0008 296 0 0 Pass 0.0008 287 0 0 Pass 0.0008 271 0 0 Pass 0.0009 257 0 0 Pass 0.0009 246 0 0 Pass 0.0009 236 0 0 Pass 0.0009 222 0 0 Pass 0.0009 212 0 0 Pass 0.0009 199 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 13 | P a g e 0.0010 188 0 0 Pass 0.0010 184 0 0 Pass 0.0010 168 0 0 Pass 0.0010 157 0 0 Pass 0.0010 153 0 0 Pass 0.0011 149 0 0 Pass 0.0011 146 0 0 Pass 0.0011 139 0 0 Pass 0.0011 135 0 0 Pass 0.0011 134 0 0 Pass 0.0011 123 0 0 Pass 0.0012 115 0 0 Pass 0.0012 108 0 0 Pass 0.0012 106 0 0 Pass 0.0012 103 0 0 Pass 0.0012 99 0 0 Pass 0.0012 97 0 0 Pass 0.0013 94 0 0 Pass 0.0013 84 0 0 Pass 0.0013 79 0 0 Pass 0.0013 75 0 0 Pass 0.0013 73 0 0 Pass 0.0013 70 0 0 Pass 0.0014 68 0 0 Pass 0.0014 60 0 0 Pass 0.0014 54 0 0 Pass 0.0014 51 0 0 Pass 0.0014 49 0 0 Pass 0.0014 48 0 0 Pass 0.0015 45 0 0 Pass 0.0015 39 0 0 Pass 0.0015 33 0 0 Pass 0.0015 31 0 0 Pass 0.0015 28 0 0 Pass 0.0015 23 0 0 Pass 0.0016 22 0 0 Pass 0.0016 19 0 0 Pass 0.0016 16 0 0 Pass 0.0016 14 0 0 Pass 0.0016 11 0 0 Pass 0.0017 6 0 0 Pass 0.0017 4 0 0 Pass 0.0017 4 0 0 Pass 0.0017 3 0 0 Pass 0.0017 3 0 0 Pass 0.0017 1 0 0 Pass 0.0018 0 0 0 Pass 0.0018 0 0 0 Pass 0.0018 0 0 0 Pass 0.0018 0 0 0 Pass 0.0018 0 0 0 Pass 0.0018 0 0 0 Pass 0.0019 0 0 0 Pass 0.0019 0 0 0 Pass 0.0019 0 0 0 Pass 0.0019 0 0 0 Pass 0.0019 0 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 14 | P a g e 0.0019 0 0 0 Pass 0.0020 0 0 0 Pass 0.0020 0 0 0 Pass 0.0020 0 0 0 Pass 0.0020 0 0 0 Pass 0.0020 0 0 0 Pass 0.0020 0 0 0 Pass 0.0021 0 0 0 Pass 0.0021 0 0 0 Pass 0.0021 0 0 0 Pass 0.0021 0 0 0 Pass 0.0021 0 0 0 Pass 0.0021 0 0 0 Pass 0.0022 0 0 0 Pass 0.0022 0 0 0 Pass 0.0022 0 0 0 Pass 0.0022 0 0 0 Pass 0.0022 0 0 0 Pass 0.0023 0 0 0 Pass 0.0023 0 0 0 Pass 0.0023 0 0 0 Pass 0.0023 0 0 0 Pass ___________________________________________________________________ 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 Tank 1 POC N 142.64 N 100.00 Total Volume Infiltrated 142.64 0.00 0.00 100.00 0.00 0% No Treat. Credit Compliance with LID Standard 8 Duration Analysis Result = Passed ___________________________________________________________________ Perlnd and Implnd Changes No changes have been made. ___________________________________________________________________ This program and accompanying documentation is provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by the user. Clear Creek Solutions, Inc. disclaims 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. has been advised of the possibility of such damages. B. AREA #1 WATER QUALITY The water quality for the area draining to the infiltration system will be provided with a PerkFilter™ a proprietary water quality advice with GULD approval. The area draining to the PORT TOWNSEND U-HAUL J# 6589 15 | P a g e water quality device is the pavement in the north basin, or 46,799 square feet. The offline water quality flow rate for the asphalt in the north basin is 0.073 cfs. Assuming the water quality flow rate 35 gpm. Two 18” filters in a type 2 manhole will provide treatment of 36 gpm. . This will provide treatment for 36 gpm (0.08 cfs) and includes a high flow bypass for the 100 year peak flow of 0.73 cfs. a. Water Quality for Perkfilter Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: WQ NORTH 3-21 Site Name: 6589 UHAUL Site Address: AIRPORT CUTOFF ROAD City : Report Date: 3/28/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ Low Flow Threshold for POC 1 : 50 Percent of the 2 Year ___________________________________________________________________ High Flow Threshold for POC 1: 50 year ___________________________________________________________________ PREDEVELOPED LAND USE Name : EXISTING NORTH BASIN Bypass: No GroundWater: No Pervious Land Use acre A B, Forest, Mod 1.08 Pervious Total 1.08 Impervious Land Use acre Impervious Total 0 Basin Total 1.08 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre PORT TOWNSEND U-HAUL J# 6589 16 | P a g e Pervious Total 0 Impervious Land Use acre ROADS FLAT 1.08 Impervious Total 1.08 Basin Total 1.08 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.08 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:1.08 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000604 5 year 0.000842 10 year 0.000961 25 year 0.001078 50 year 0.001146 100 year 0.0012 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.301001 5 year 0.407859 10 year 0.481287 25 year 0.577178 50 year 0.650914 100 year 0.726651 ___________________________________________________________________ The development has an increase in flow durations from 8% of the 2 year flow 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: 0.0994 acre-feet On-line facility target flow: 0.142 cfs. Adjusted for 15 min: 0.142 cfs. Off-line facility target flow: 0.0773 cfs. Adjusted for 15 min: 0.0773 cfs. PORT TOWNSEND U-HAUL J# 6589 17 | P a g e C. PERVIOUS GRAVEL Pervious gravel is proposed for several parking areas throughout the site as well as pervious gravel driveways for a portion of the site. For purposes of this analysis, the minimum infiltration rate based on the PIT tests performed by the Geotechnical Report was 2 minutes per inch. This conservative infiltration rate is used, with the correction factor based on the WDOE 2014 SWMMWW. The area used for the size of the pervious gravel section of a minimum storage depth is the 29,000 square feet of gravel parking areas in the southeast corner of the site, and the 29,987 square feet of related gravel driveway for a total of 58,987 square feet or 1.35 acres. Correction Factor: CFT CFv = # of tests = 1.0 CFt = small PIT = 0.5 CFm = build-up prevention = 0.9 CFT = 1.0 x 0.5 x 0.9 = 0.45 a. Pervious Gravel Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: 6589 PERVIOUS WWHM Site Name: PT UHAUL Site Address: City : Report Date: 4/10/2020 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ 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 A B, Forest, Mod 1.35 Pervious Total 1.35 Impervious Land Use acre Impervious Total 0 2019 It should be noted that the pervious gravel is modeled to determine a minimum road section for the gravel base course. The pervious gravel is not a storm water management feature but is provided to meet the maximum impervious area of 60% for this project. An overflow system is provided and is designed to provide additional water quality mitigation and flow control. PORT TOWNSEND U-HAUL J# 6589 18 | P a g e Basin Total 1.35 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING MOD 1.35 Impervious Total 1.35 Basin Total 1.35 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater PERVIOUS PAVEMENT PERVIOUS PAVEMENT ___________________________________________________________________ Name : PERVIOUS PAVEMENT Bottom Length: 393.00 ft. Bottom Width: 150.00 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: 0.5 Pore 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: 2 Infiltration safety factor: 0.45 Total Volume Infiltrated (ac-ft.): 100.037 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 100.037 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 1000 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Gravel Trench Bed Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) PORT TOWNSEND U-HAUL J# 6589 19 | P a g e 0.0000 1.353 0.000 0.000 0.000 0.0056 1.353 0.003 0.000 1.228 0.0111 1.353 0.006 0.000 1.228 0.0167 1.353 0.009 0.000 1.228 0.0222 1.353 0.012 0.000 1.228 0.0278 1.353 0.015 0.000 1.228 0.0333 1.353 0.018 0.000 1.228 0.0389 1.353 0.021 0.000 1.228 0.0444 1.353 0.024 0.000 1.228 0.0500 1.353 0.027 0.000 1.228 0.0556 1.353 0.030 0.000 1.228 0.0611 1.353 0.033 0.000 1.228 0.0667 1.353 0.036 0.000 1.228 0.0722 1.353 0.039 0.000 1.228 0.0778 1.353 0.042 0.000 1.228 0.0833 1.353 0.045 0.000 1.228 0.0889 1.353 0.048 0.000 1.228 0.0944 1.353 0.051 0.000 1.228 0.1000 1.353 0.054 0.000 1.228 0.1056 1.353 0.057 0.000 1.228 0.1111 1.353 0.060 0.000 1.228 0.1167 1.353 0.063 0.000 1.228 0.1222 1.353 0.066 0.000 1.228 0.1278 1.353 0.069 0.000 1.228 0.1333 1.353 0.072 0.000 1.228 0.1389 1.353 0.075 0.000 1.228 0.1444 1.353 0.078 0.000 1.228 0.1500 1.353 0.081 0.000 1.228 0.1556 1.353 0.084 0.000 1.228 0.1611 1.353 0.087 0.000 1.228 0.1667 1.353 0.090 0.000 1.228 0.1722 1.353 0.093 0.000 1.228 0.1778 1.353 0.096 0.000 1.228 0.1833 1.353 0.099 0.000 1.228 0.1889 1.353 0.102 0.000 1.228 0.1944 1.353 0.105 0.000 1.228 0.2000 1.353 0.108 0.000 1.228 0.2056 1.353 0.111 0.000 1.228 0.2111 1.353 0.114 0.000 1.228 0.2167 1.353 0.117 0.000 1.228 0.2222 1.353 0.120 0.000 1.228 0.2278 1.353 0.123 0.000 1.228 0.2333 1.353 0.126 0.000 1.228 0.2389 1.353 0.129 0.000 1.228 0.2444 1.353 0.132 0.000 1.228 0.2500 1.353 0.135 0.000 1.228 0.2556 1.353 0.138 0.000 1.228 0.2611 1.353 0.141 0.000 1.228 0.2667 1.353 0.144 0.000 1.228 0.2722 1.353 0.147 0.000 1.228 0.2778 1.353 0.150 0.000 1.228 0.2833 1.353 0.153 0.000 1.228 0.2889 1.353 0.156 0.000 1.228 0.2944 1.353 0.159 0.000 1.228 0.3000 1.353 0.162 0.000 1.228 0.3056 1.353 0.165 0.000 1.228 0.3111 1.353 0.168 0.000 1.228 PORT TOWNSEND U-HAUL J# 6589 20 | P a g e 0.3167 1.353 0.171 0.000 1.228 0.3222 1.353 0.174 0.000 1.228 0.3278 1.353 0.177 0.000 1.228 0.3333 1.353 0.180 0.000 1.228 0.3389 1.353 0.183 0.000 1.228 0.3444 1.353 0.186 0.000 1.228 0.3500 1.353 0.189 0.000 1.228 0.3556 1.353 0.192 0.000 1.228 0.3611 1.353 0.195 0.000 1.228 0.3667 1.353 0.198 0.000 1.228 0.3722 1.353 0.201 0.000 1.228 0.3778 1.353 0.204 0.000 1.228 0.3833 1.353 0.207 0.000 1.228 0.3889 1.353 0.210 0.000 1.228 0.3944 1.353 0.213 0.000 1.228 0.4000 1.353 0.216 0.000 1.228 0.4056 1.353 0.219 0.000 1.228 0.4111 1.353 0.222 0.000 1.228 0.4167 1.353 0.225 0.000 1.228 0.4222 1.353 0.228 0.000 1.228 0.4278 1.353 0.231 0.000 1.228 0.4333 1.353 0.234 0.000 1.228 0.4389 1.353 0.237 0.000 1.228 0.4444 1.353 0.240 0.000 1.228 0.4500 1.353 0.243 0.000 1.228 0.4556 1.353 0.246 0.000 1.228 0.4611 1.353 0.249 0.000 1.228 0.4667 1.353 0.252 0.000 1.228 0.4722 1.353 0.255 0.000 1.228 0.4778 1.353 0.258 0.000 1.228 0.4833 1.353 0.261 0.000 1.228 0.4889 1.353 0.264 0.000 1.228 0.4944 1.353 0.267 0.000 1.228 0.5000 1.353 0.270 0.000 1.228 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.35 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:1.35 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000756 5 year 0.001052 10 year 0.001202 25 year 0.001348 50 year 0.001432 100 year 0.0015 Flow Frequency Return Periods for Mitigated. POC #1 PORT TOWNSEND U-HAUL J# 6589 21 | P a g e Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.001 0.000 1950 0.001 0.000 1951 0.001 0.000 1952 0.001 0.000 1953 0.001 0.000 1954 0.001 0.000 1955 0.001 0.000 1956 0.001 0.000 1957 0.001 0.000 1958 0.000 0.000 1959 0.001 0.000 1960 0.001 0.000 1961 0.001 0.000 1962 0.001 0.000 1963 0.001 0.000 1964 0.001 0.000 1965 0.001 0.000 1966 0.001 0.000 1967 0.001 0.000 1968 0.001 0.000 1969 0.001 0.000 1970 0.001 0.000 1971 0.001 0.000 1972 0.001 0.000 1973 0.001 0.000 1974 0.000 0.000 1975 0.001 0.000 1976 0.001 0.000 1977 0.000 0.000 1978 0.000 0.000 1979 0.001 0.000 1980 0.001 0.000 1981 0.001 0.000 1982 0.001 0.000 1983 0.001 0.000 1984 0.001 0.000 1985 0.001 0.000 1986 0.001 0.000 1987 0.001 0.000 1988 0.001 0.000 1989 0.001 0.000 1990 0.001 0.000 1991 0.001 0.000 1992 0.001 0.000 1993 0.000 0.000 1994 0.000 0.000 PORT TOWNSEND U-HAUL J# 6589 22 | P a g e 1995 0.000 0.000 1996 0.001 0.000 1997 0.001 0.000 1998 0.000 0.000 1999 0.001 0.000 2000 0.001 0.000 2001 0.000 0.000 2002 0.001 0.000 2003 0.001 0.000 2004 0.001 0.000 2005 0.001 0.000 2006 0.001 0.000 2007 0.001 0.000 2008 0.001 0.000 2009 0.001 0.000 ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0011 0.0000 2 0.0011 0.0000 3 0.0011 0.0000 4 0.0011 0.0000 5 0.0010 0.0000 6 0.0010 0.0000 7 0.0010 0.0000 8 0.0010 0.0000 9 0.0010 0.0000 10 0.0010 0.0000 11 0.0010 0.0000 12 0.0010 0.0000 13 0.0010 0.0000 14 0.0010 0.0000 15 0.0010 0.0000 16 0.0010 0.0000 17 0.0010 0.0000 18 0.0010 0.0000 19 0.0010 0.0000 20 0.0010 0.0000 21 0.0009 0.0000 22 0.0009 0.0000 23 0.0009 0.0000 24 0.0009 0.0000 25 0.0009 0.0000 26 0.0009 0.0000 27 0.0009 0.0000 28 0.0009 0.0000 29 0.0008 0.0000 30 0.0008 0.0000 31 0.0008 0.0000 32 0.0008 0.0000 33 0.0008 0.0000 34 0.0008 0.0000 35 0.0008 0.0000 36 0.0008 0.0000 37 0.0008 0.0000 38 0.0008 0.0000 PORT TOWNSEND U-HAUL J# 6589 23 | P a g e 39 0.0007 0.0000 40 0.0007 0.0000 41 0.0007 0.0000 42 0.0007 0.0000 43 0.0007 0.0000 44 0.0006 0.0000 45 0.0006 0.0000 46 0.0006 0.0000 47 0.0006 0.0000 48 0.0005 0.0000 49 0.0005 0.0000 50 0.0005 0.0000 51 0.0005 0.0000 52 0.0005 0.0000 53 0.0005 0.0000 54 0.0005 0.0000 55 0.0004 0.0000 56 0.0004 0.0000 57 0.0003 0.0000 58 0.0003 0.0000 59 0.0002 0.0000 60 0.0001 0.0000 61 0.0001 0.0000 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0004 527 0 0 Pass 0.0004 507 0 0 Pass 0.0004 480 0 0 Pass 0.0004 459 0 0 Pass 0.0004 434 0 0 Pass 0.0004 410 0 0 Pass 0.0004 385 0 0 Pass 0.0005 369 0 0 Pass 0.0005 348 0 0 Pass 0.0005 331 0 0 Pass 0.0005 322 0 0 Pass 0.0005 307 0 0 Pass 0.0005 296 0 0 Pass 0.0005 288 0 0 Pass 0.0005 271 0 0 Pass 0.0005 257 0 0 Pass 0.0005 246 0 0 Pass 0.0006 238 0 0 Pass 0.0006 223 0 0 Pass 0.0006 211 0 0 Pass 0.0006 200 0 0 Pass 0.0006 188 0 0 Pass 0.0006 184 0 0 Pass 0.0006 169 0 0 Pass 0.0006 157 0 0 Pass 0.0006 153 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 24 | P a g e 0.0007 151 0 0 Pass 0.0007 146 0 0 Pass 0.0007 139 0 0 Pass 0.0007 135 0 0 Pass 0.0007 133 0 0 Pass 0.0007 123 0 0 Pass 0.0007 115 0 0 Pass 0.0007 109 0 0 Pass 0.0007 107 0 0 Pass 0.0008 103 0 0 Pass 0.0008 99 0 0 Pass 0.0008 97 0 0 Pass 0.0008 94 0 0 Pass 0.0008 85 0 0 Pass 0.0008 79 0 0 Pass 0.0008 75 0 0 Pass 0.0008 73 0 0 Pass 0.0008 70 0 0 Pass 0.0008 68 0 0 Pass 0.0009 60 0 0 Pass 0.0009 54 0 0 Pass 0.0009 51 0 0 Pass 0.0009 49 0 0 Pass 0.0009 48 0 0 Pass 0.0009 45 0 0 Pass 0.0009 40 0 0 Pass 0.0009 33 0 0 Pass 0.0009 30 0 0 Pass 0.0010 28 0 0 Pass 0.0010 23 0 0 Pass 0.0010 22 0 0 Pass 0.0010 20 0 0 Pass 0.0010 16 0 0 Pass 0.0010 14 0 0 Pass 0.0010 11 0 0 Pass 0.0010 6 0 0 Pass 0.0010 4 0 0 Pass 0.0010 4 0 0 Pass 0.0011 3 0 0 Pass 0.0011 3 0 0 Pass 0.0011 1 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0013 0 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 25 | P a g e 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass ___________________________________________________________________ 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. ___________________________________________________________________ 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 PERVIOUS PAVEMENT POC N 91.03 N 100.00 Total Volume Infiltrated 91.03 0.00 0.00 100.00 0.00 0% No Treat. Credit Compliance with LID Standard 8 Duration Analysis Result = Passed ___________________________________________________________________ Perlnd and Implnd Changes No changes have been made. ___________________________________________________________________ This program and accompanying documentation is provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by the user. Clear Creek Solutions, Inc. disclaims 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. has been advised of the possibility of such damages. PORT TOWNSEND U-HAUL J# 6589 26 | P a g e A. BIORETENTION CELL #1 Bioretention cell #1 is located in the southeast margin of the site in the building setback area. The system is designed to collect runoff from 60,806 square feet or 1.40 acres of pavement and pervious gravel overflow. The system is designed for 91% infiltration through the bioretention soil mix. A correction factor of 4 is applied to the bioretention soil mix coefficient of saturation Ksat. This number is not reflected in the WWHMM2012 Report output. The subgrade infiltration rate of 10 inches per hour has the correction factor already built in but the bioretention soil mix is the restricting factor for water quality mitigation. A bioretention cell of 110 feet long x 6 feet wide with a 6” pond depth and 6” of freeboard is proposed. This provides 91.83% infiltration. a. Bioretention#1 Cell WWHM Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: 6589 bioretention #2 Site Name: PT UHAUL Site Address: City : Report Date: 3/31/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ 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 A B, Forest, Mod 1.4 Pervious Total 1.4 Impervious Land Use acre Impervious Total 0 Basin Total 1.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater PORT TOWNSEND U-HAUL J# 6589 27 | P a g e ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS MOD 0.99 PARKING MOD 0.41 Impervious Total 1.4 Basin Total 1.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater Surface retention 1 Surface retention 1 ___________________________________________________________________ Name : Bioretention 1 Bottom Length: 110.00 ft. Bottom Width: 6.00 ft. Material thickness of first layer: 1.5 Material type for first layer: SMMWW 12 in/hr Material Correction Factor: 4 Material thickness of second layer: 0 Material type for second layer: GRAVEL Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 10 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 95.854 Total Volume Through Riser (ac-ft.): 8.523 Total Volume Through Facility (ac-ft.): 104.377 Percent Infiltrated: 91.83 Total Precip Applied to Facility: 1.564 Total Evap From Facility: 1.061 Underdrain not used Discharge Structure Riser Height: 1 ft. Riser Diameter: 12 in. Element Flows To: Outlet 1 Outlet 2 Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.4 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 PORT TOWNSEND U-HAUL J# 6589 28 | P a g e Total Pervious Area:0 Total Impervious Area:1.4 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000784 5 year 0.001091 10 year 0.001246 25 year 0.001398 50 year 0.001485 100 year 0.001556 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.306725 5 year 0.484919 10 year 0.582791 25 year 0.683007 50 year 0.742823 100 year 0.792138 ___________________________________________________________________ B. INFILTRATION SYSTEM #2 Bioretention System #1 drains to an infiltration system below the bioretention system. The area draining to the infiltration system is the same 1.4 acres. The system consists of 260 linear feet of 48” diameter perforated tank in a rock lined trench. Access risers will be placed so that tank access within the tank is no less than 50 feet from each access point. The infiltration rate is 10 inches per hour which includes the pre-calculated safety factor calculated by Terracon. The peak stage for the tank is2.94’ providing a foot of freeboard. a. Infiltration Trench #1Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: Infiltration South March 2021 Site Name: PT UHAUL Site Address: City : Report Date: 4/5/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ Low Flow Threshold for POC 1 : 50 Percent of the 2 Year ___________________________________________________________________ High Flow Threshold for POC 1: 50 year ___________________________________________________________________ PREDEVELOPED LAND USE PORT TOWNSEND U-HAUL J# 6589 29 | P a g e Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre A B, Forest, Mod 1.4 Pervious Total 1.1.4 Impervious Land Use acre Impervious Total 0 Basin Total 1.1.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre DRIVEWAYS MOD 0.99 PARKING MOD 0.41 Impervious Total 1.4 Basin Total 1.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater Tank 1 Tank 1 ___________________________________________________________________ Name : Tank 1 Tank Name: Tank 1 Dimensions Depth: 4 ft. Tank Type : Circular Diameter : 4 ft. Length : 260 ft. PORT TOWNSEND U-HAUL J# 6589 30 | P a g e Infiltration On Infiltration rate: 10 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 103.03 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 103.03 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 4 ft. Riser Diameter: 1000 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Tank Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000 0.000 0.000 0.000 0.0444 0.005 0.000 0.000 0.050 0.0889 0.007 0.000 0.000 0.071 0.1333 0.008 0.000 0.000 0.086 0.1778 0.009 0.001 0.000 0.099 0.2222 0.010 0.001 0.000 0.110 0.2667 0.011 0.002 0.000 0.120 0.3111 0.012 0.002 0.000 0.129 0.3556 0.013 0.003 0.000 0.137 0.4000 0.014 0.003 0.000 0.144 0.4444 0.015 0.004 0.000 0.151 0.4889 0.015 0.005 0.000 0.157 0.5333 0.016 0.005 0.000 0.163 0.5778 0.016 0.006 0.000 0.169 0.6222 0.017 0.007 0.000 0.174 0.6667 0.017 0.008 0.000 0.179 0.7111 0.018 0.009 0.000 0.184 0.7556 0.018 0.009 0.000 0.188 0.8000 0.019 0.010 0.000 0.192 0.8444 0.019 0.011 0.000 0.196 0.8889 0.019 0.012 0.000 0.200 0.9333 0.020 0.013 0.000 0.203 0.9778 0.020 0.014 0.000 0.206 1.0222 0.020 0.015 0.000 0.210 1.0667 0.021 0.016 0.000 0.212 1.1111 0.021 0.017 0.000 0.215 1.1556 0.021 0.018 0.000 0.218 1.2000 0.021 0.018 0.000 0.220 1.2444 0.022 0.019 0.000 0.222 1.2889 0.022 0.020 0.000 0.225 1.3333 0.022 0.021 0.000 0.227 1.3778 0.022 0.022 0.000 0.228 1.4222 0.022 0.023 0.000 0.230 1.4667 0.023 0.024 0.000 0.232 1.5111 0.023 0.025 0.000 0.233 1.5556 0.023 0.027 0.000 0.234 1.6000 0.023 0.028 0.000 0.235 1.6444 0.023 0.029 0.000 0.236 1.6889 0.023 0.030 0.000 0.237 PORT TOWNSEND U-HAUL J# 6589 31 | P a g e 1.7333 0.023 0.031 0.000 0.238 1.7778 0.023 0.032 0.000 0.239 1.8222 0.023 0.033 0.000 0.239 1.8667 0.023 0.034 0.000 0.240 1.9111 0.023 0.035 0.000 0.240 1.9556 0.023 0.036 0.000 0.240 2.0000 0.023 0.037 0.000 0.240 2.0444 0.023 0.038 0.000 0.240 2.0889 0.023 0.039 0.000 0.240 2.1333 0.023 0.040 0.000 0.240 2.1778 0.023 0.041 0.000 0.240 2.2222 0.023 0.042 0.000 0.240 2.2667 0.023 0.043 0.000 0.240 2.3111 0.023 0.044 0.000 0.240 2.3556 0.023 0.045 0.000 0.240 2.4000 0.023 0.047 0.000 0.240 2.4444 0.023 0.048 0.000 0.240 2.4889 0.023 0.049 0.000 0.240 2.5333 0.023 0.050 0.000 0.240 2.5778 0.022 0.051 0.000 0.240 2.6222 0.022 0.052 0.000 0.240 2.6667 0.022 0.053 0.000 0.240 2.7111 0.022 0.054 0.000 0.240 2.7556 0.022 0.055 0.000 0.240 2.8000 0.021 0.056 0.000 0.240 2.8444 0.021 0.057 0.000 0.240 2.8889 0.021 0.058 0.000 0.240 2.9333 0.021 0.058 0.000 0.240 2.9778 0.020 0.059 0.000 0.240 3.0222 0.020 0.060 0.000 0.240 3.0667 0.020 0.061 0.000 0.240 3.1111 0.019 0.062 0.000 0.240 3.1556 0.019 0.063 0.000 0.240 3.2000 0.019 0.064 0.000 0.240 3.2444 0.018 0.065 0.000 0.240 3.2889 0.018 0.066 0.000 0.240 3.3333 0.017 0.066 0.000 0.240 3.3778 0.017 0.067 0.000 0.240 3.4222 0.016 0.068 0.000 0.240 3.4667 0.016 0.069 0.000 0.240 3.5111 0.015 0.069 0.000 0.240 3.5556 0.015 0.070 0.000 0.240 3.6000 0.014 0.071 0.000 0.240 3.6444 0.013 0.071 0.000 0.240 3.6889 0.012 0.072 0.000 0.240 3.7333 0.011 0.072 0.000 0.240 3.7778 0.010 0.073 0.000 0.240 3.8222 0.009 0.073 0.000 0.240 3.8667 0.008 0.074 0.000 0.240 3.9111 0.007 0.074 0.000 0.240 3.9556 0.005 0.074 0.000 0.240 4.0000 0.000 0.075 0.000 0.240 4.0444 0.000 0.000 8.293 0.240 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration PORT TOWNSEND U-HAUL J# 6589 32 | P a g e ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.4 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:1.4 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000778 5 year 0.001083 10 year 0.001237 25 year 0.001388 50 year 0.001474 100 year 0.001545 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.001 0.000 1950 0.001 0.000 1951 0.001 0.000 1952 0.001 0.000 1953 0.001 0.000 1954 0.001 0.000 1955 0.001 0.000 1956 0.001 0.000 1957 0.001 0.000 1958 0.000 0.000 1959 0.001 0.000 1960 0.001 0.000 1961 0.001 0.000 1962 0.001 0.000 1963 0.001 0.000 1964 0.001 0.000 1965 0.001 0.000 1966 0.001 0.000 1967 0.001 0.000 1968 0.001 0.000 1969 0.001 0.000 1970 0.001 0.000 1971 0.001 0.000 1972 0.001 0.000 1973 0.001 0.000 1974 0.000 0.000 PORT TOWNSEND U-HAUL J# 6589 33 | P a g e 1975 0.001 0.000 1976 0.001 0.000 1977 0.000 0.000 1978 0.000 0.000 1979 0.001 0.000 1980 0.001 0.000 1981 0.001 0.000 1982 0.001 0.000 1983 0.001 0.000 1984 0.001 0.000 1985 0.001 0.000 1986 0.001 0.000 1987 0.001 0.000 1988 0.001 0.000 1989 0.001 0.000 1990 0.001 0.000 1991 0.001 0.000 1992 0.001 0.000 1993 0.000 0.000 1994 0.000 0.000 1995 0.000 0.000 1996 0.001 0.000 1997 0.001 0.000 1998 0.000 0.000 1999 0.001 0.000 2000 0.001 0.000 2001 0.000 0.000 2002 0.001 0.000 2003 0.001 0.000 2004 0.001 0.000 2005 0.001 0.000 2006 0.001 0.000 2007 0.001 0.000 2008 0.001 0.000 2009 0.001 0.000 ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0011 0.0000 2 0.0011 0.0000 3 0.0011 0.0000 4 0.0011 0.0000 5 0.0011 0.0000 6 0.0011 0.0000 7 0.0011 0.0000 8 0.0011 0.0000 9 0.0010 0.0000 10 0.0010 0.0000 11 0.0010 0.0000 12 0.0010 0.0000 13 0.0010 0.0000 14 0.0010 0.0000 15 0.0010 0.0000 16 0.0010 0.0000 17 0.0010 0.0000 18 0.0010 0.0000 PORT TOWNSEND U-HAUL J# 6589 34 | P a g e 19 0.0010 0.0000 20 0.0010 0.0000 21 0.0010 0.0000 22 0.0009 0.0000 23 0.0009 0.0000 24 0.0009 0.0000 25 0.0009 0.0000 26 0.0009 0.0000 27 0.0009 0.0000 28 0.0009 0.0000 29 0.0009 0.0000 30 0.0008 0.0000 31 0.0008 0.0000 32 0.0008 0.0000 33 0.0008 0.0000 34 0.0008 0.0000 35 0.0008 0.0000 36 0.0008 0.0000 37 0.0008 0.0000 38 0.0008 0.0000 39 0.0007 0.0000 40 0.0007 0.0000 41 0.0007 0.0000 42 0.0007 0.0000 43 0.0007 0.0000 44 0.0006 0.0000 45 0.0006 0.0000 46 0.0006 0.0000 47 0.0006 0.0000 48 0.0006 0.0000 49 0.0005 0.0000 50 0.0005 0.0000 51 0.0005 0.0000 52 0.0005 0.0000 53 0.0005 0.0000 54 0.0005 0.0000 55 0.0004 0.0000 56 0.0004 0.0000 57 0.0003 0.0000 58 0.0003 0.0000 59 0.0003 0.0000 60 0.0001 0.0000 61 0.0001 0.0000 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0004 529 0 0 Pass 0.0004 509 0 0 Pass 0.0004 481 0 0 Pass 0.0004 459 0 0 Pass 0.0004 437 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 35 | P a g e 0.0004 411 0 0 Pass 0.0005 385 0 0 Pass 0.0005 370 0 0 Pass 0.0005 349 0 0 Pass 0.0005 331 0 0 Pass 0.0005 322 0 0 Pass 0.0005 309 0 0 Pass 0.0005 296 0 0 Pass 0.0005 288 0 0 Pass 0.0005 272 0 0 Pass 0.0006 257 0 0 Pass 0.0006 246 0 0 Pass 0.0006 236 0 0 Pass 0.0006 223 0 0 Pass 0.0006 212 0 0 Pass 0.0006 199 0 0 Pass 0.0006 188 0 0 Pass 0.0006 184 0 0 Pass 0.0006 168 0 0 Pass 0.0007 157 0 0 Pass 0.0007 154 0 0 Pass 0.0007 151 0 0 Pass 0.0007 146 0 0 Pass 0.0007 139 0 0 Pass 0.0007 135 0 0 Pass 0.0007 134 0 0 Pass 0.0007 124 0 0 Pass 0.0007 115 0 0 Pass 0.0008 109 0 0 Pass 0.0008 107 0 0 Pass 0.0008 103 0 0 Pass 0.0008 99 0 0 Pass 0.0008 97 0 0 Pass 0.0008 94 0 0 Pass 0.0008 86 0 0 Pass 0.0008 79 0 0 Pass 0.0008 75 0 0 Pass 0.0008 73 0 0 Pass 0.0009 70 0 0 Pass 0.0009 68 0 0 Pass 0.0009 60 0 0 Pass 0.0009 54 0 0 Pass 0.0009 51 0 0 Pass 0.0009 49 0 0 Pass 0.0009 48 0 0 Pass 0.0009 45 0 0 Pass 0.0009 40 0 0 Pass 0.0010 34 0 0 Pass 0.0010 31 0 0 Pass 0.0010 28 0 0 Pass 0.0010 23 0 0 Pass 0.0010 22 0 0 Pass 0.0010 20 0 0 Pass 0.0010 16 0 0 Pass 0.0010 14 0 0 Pass 0.0010 11 0 0 Pass 0.0011 6 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 36 | P a g e 0.0011 4 0 0 Pass 0.0011 4 0 0 Pass 0.0011 3 0 0 Pass 0.0011 3 0 0 Pass 0.0011 1 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0011 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0012 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0013 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0014 0 0 0 Pass 0.0015 0 0 0 Pass 0.0015 0 0 0 Pass 0.0015 0 0 0 Pass C. BIORETENTION CELL #2 Bioretention Cell #2 is designed to collect runoff from 12,188 square feet or 0.28 acres of pavement. The system is designed for 100% infiltration to the soils below the bioretention soil mix. A correction factor of 4 is applied to the bioretention soil mix coefficient of saturation Ksat. This number is not reflected in the WWHMM2012 Report output. The subgrade infiltration rate of 10 inches per hour is used for the underlying infiltration from the bioretention system. An oval bioretention cell has a bottom area of 990 square feet, so is modeled as 66’ x 15’ with a 6” pond depth and 6” of freeboard is proposed. a) Bioretention Cell #2 WWHM Report WWHM2012 PROJECT REPORT ___________________________________________________________________ PORT TOWNSEND U-HAUL J# 6589 37 | P a g e Project Name: 6589 BIORETENTION #2 4-1-21 Site Name: PT UHAUL Site Address: City : Report Date: 4/9/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ 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 A B, Forest, Mod .28 Pervious Total 0.28 Impervious Land Use acre Impervious Total 0 Basin Total 0.28 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING MOD 0.28 Impervious Total 0.28 Basin Total 0.28 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater PORT TOWNSEND U-HAUL J# 6589 38 | P a g e Surface retention 1 Surface retention 1 ___________________________________________________________________ Name : Bioretention 1 Bottom Length: 66.00 ft. Bottom Width: 15.00 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: GRAVEL Material thickness of third layer: 0 Material type for third layer: GRAVEL Infiltration On Infiltration rate: 10 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 21.168 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 21.168 Percent Infiltrated: 100 Total Precip Applied to Facility: 1.801 Total Evap From Facility: 1.388 Underdrain not used Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 12 in. Element Flows To: Outlet 1 Outlet 2 ___________________________________________________________________ Bioretention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.0227 0.0000 0.0000 0.0000 0.0275 0.0227 0.0003 0.0000 0.0000 0.0549 0.0227 0.0006 0.0000 0.0000 0.0824 0.0227 0.0009 0.0000 0.0000 0.1099 0.0227 0.0011 0.0000 0.0000 0.1374 0.0227 0.0014 0.0000 0.0000 0.1648 0.0227 0.0017 0.0000 0.0003 0.1923 0.0227 0.0020 0.0000 0.0004 0.2198 0.0227 0.0023 0.0000 0.0006 0.2473 0.0227 0.0026 0.0000 0.0008 0.2747 0.0227 0.0029 0.0000 0.0011 0.3022 0.0227 0.0031 0.0000 0.0013 0.3297 0.0227 0.0034 0.0000 0.0016 0.3571 0.0227 0.0037 0.0000 0.0020 0.3846 0.0227 0.0040 0.0000 0.0024 0.4121 0.0227 0.0043 0.0000 0.0028 0.4396 0.0227 0.0046 0.0000 0.0033 0.4670 0.0227 0.0049 0.0000 0.0038 0.4945 0.0227 0.0051 0.0000 0.0044 0.5220 0.0227 0.0054 0.0000 0.0050 0.5495 0.0227 0.0057 0.0000 0.0057 0.5769 0.0227 0.0060 0.0000 0.0064 0.6044 0.0227 0.0063 0.0000 0.0072 0.6319 0.0227 0.0066 0.0000 0.0081 0.6593 0.0227 0.0069 0.0000 0.0090 0.6868 0.0227 0.0071 0.0000 0.0099 0.7143 0.0227 0.0074 0.0000 0.0109 PORT TOWNSEND U-HAUL J# 6589 39 | P a g e 0.7418 0.0227 0.0077 0.0000 0.0120 0.7692 0.0227 0.0080 0.0000 0.0131 0.7967 0.0227 0.0083 0.0000 0.0143 0.8242 0.0227 0.0086 0.0000 0.0155 0.8516 0.0227 0.0089 0.0000 0.0168 0.8791 0.0227 0.0091 0.0000 0.0182 0.9066 0.0227 0.0094 0.0000 0.0196 0.9341 0.0227 0.0097 0.0000 0.0211 0.9615 0.0227 0.0100 0.0000 0.0227 0.9890 0.0227 0.0103 0.0000 0.0243 1.0165 0.0227 0.0106 0.0000 0.0260 1.0440 0.0227 0.0109 0.0000 0.0278 1.0714 0.0227 0.0111 0.0000 0.0297 1.0989 0.0227 0.0114 0.0000 0.0316 1.1264 0.0227 0.0117 0.0000 0.0336 1.1538 0.0227 0.0120 0.0000 0.0356 1.1813 0.0227 0.0123 0.0000 0.0378 1.2088 0.0227 0.0126 0.0000 0.0400 1.2363 0.0227 0.0128 0.0000 0.0423 1.2637 0.0227 0.0131 0.0000 0.0446 1.2912 0.0227 0.0134 0.0000 0.0471 1.3187 0.0227 0.0137 0.0000 0.0496 1.3462 0.0227 0.0140 0.0000 0.0522 1.3736 0.0227 0.0143 0.0000 0.0548 1.4011 0.0227 0.0146 0.0000 0.0576 1.4286 0.0227 0.0148 0.0000 0.0604 1.4560 0.0227 0.0151 0.0000 0.0633 1.4835 0.0227 0.0154 0.0000 0.0662 1.5000 0.0227 0.0156 0.0000 0.0917 Surface retention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To Amended(cfs) Wetted Surface 1.5000 0.0227 0.0156 0.0000 0.0688 0.0000 1.5275 0.0230 0.0162 0.0000 0.0688 0.0000 1.5549 0.0233 0.0169 0.0000 0.0713 0.0000 1.5824 0.0237 0.0175 0.0000 0.0725 0.0000 1.6099 0.0240 0.0182 0.0000 0.0738 0.0000 1.6374 0.0243 0.0188 0.0000 0.0750 0.0000 1.6648 0.0246 0.0195 0.0000 0.0763 0.0000 1.6923 0.0249 0.0202 0.0000 0.0776 0.0000 1.7198 0.0252 0.0209 0.0000 0.0788 0.0000 1.7473 0.0255 0.0216 0.0000 0.0801 0.0000 1.7747 0.0259 0.0223 0.0000 0.0813 0.0000 1.8022 0.0262 0.0230 0.0000 0.0826 0.0000 1.8297 0.0265 0.0237 0.0000 0.0839 0.0000 1.8571 0.0268 0.0244 0.0000 0.0851 0.0000 1.8846 0.0271 0.0252 0.0000 0.0864 0.0000 1.9121 0.0275 0.0259 0.0000 0.0876 0.0000 1.9396 0.0278 0.0267 0.0000 0.0889 0.0000 1.9670 0.0281 0.0274 0.0000 0.0902 0.0000 1.9945 0.0284 0.0282 0.0000 0.0914 0.0000 2.0220 0.0288 0.0290 0.0346 0.0917 0.0000 2.0495 0.0291 0.0298 0.1165 0.0917 0.0000 2.0769 0.0294 0.0306 0.2257 0.0917 0.0000 2.1044 0.0298 0.0314 0.3555 0.0917 0.0000 2.1319 0.0301 0.0322 0.5015 0.0917 0.0000 2.1593 0.0304 0.0331 0.6597 0.0917 0.0000 PORT TOWNSEND U-HAUL J# 6589 40 | P a g e 2.1868 0.0308 0.0339 0.8261 0.0917 0.0000 2.2143 0.0311 0.0348 0.9966 0.0917 0.0000 2.2418 0.0315 0.0356 1.1671 0.0917 0.0000 2.2692 0.0318 0.0365 1.3333 0.0917 0.0000 2.2967 0.0321 0.0374 1.4914 0.0917 0.0000 2.3242 0.0325 0.0383 1.6378 0.0917 0.0000 2.3516 0.0328 0.0392 1.7695 0.0917 0.0000 2.3791 0.0332 0.0401 1.8845 0.0917 0.0000 2.4066 0.0335 0.0410 1.9818 0.0917 0.0000 2.4341 0.0339 0.0419 2.0620 0.0917 0.0000 2.4615 0.0342 0.0428 2.1274 0.0917 0.0000 2.4890 0.0346 0.0438 2.1826 0.0917 0.0000 2.5000 0.0347 0.0442 2.2635 0.0917 0.0000 ___________________________________________________________________ Name : Surface retention 1 Element Flows To: Outlet 1 Outlet 2 Bioretention 1 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.28 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.28 __________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000028 5 year 0.000039 10 year 0.000045 25 year 0.00005 50 year 0.000053 100 year 0.000056 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.000 0.000 1950 0.000 0.000 1951 0.000 0.000 1952 0.000 0.000 PORT TOWNSEND U-HAUL J# 6589 41 | P a g e 1953 0.000 0.000 1954 0.000 0.000 1955 0.000 0.000 1956 0.000 0.000 1957 0.000 0.000 1958 0.000 0.000 1959 0.000 0.000 1960 0.000 0.000 1961 0.000 0.000 1962 0.000 0.000 1963 0.000 0.000 1964 0.000 0.000 1965 0.000 0.000 1966 0.000 0.000 1967 0.000 0.000 1968 0.000 0.000 1969 0.000 0.000 1970 0.000 0.000 1971 0.000 0.000 1972 0.000 0.000 1973 0.000 0.000 1974 0.000 0.000 1975 0.000 0.000 1976 0.000 0.000 1977 0.000 0.000 1978 0.000 0.000 1979 0.000 0.000 1980 0.000 0.000 1981 0.000 0.000 1982 0.000 0.000 1983 0.000 0.000 1984 0.000 0.000 1985 0.000 0.000 1986 0.000 0.000 1987 0.000 0.000 1988 0.000 0.000 1989 0.000 0.000 1990 0.000 0.000 1991 0.000 0.000 1992 0.000 0.000 1993 0.000 0.000 1994 0.000 0.000 1995 0.000 0.000 1996 0.000 0.000 1997 0.000 0.000 1998 0.000 0.000 1999 0.000 0.000 2000 0.000 0.000 2001 0.000 0.000 2002 0.000 0.000 2003 0.000 0.000 2004 0.000 0.000 2005 0.000 0.000 2006 0.000 0.000 2007 0.000 0.000 2008 0.000 0.000 2009 0.000 0.000 PORT TOWNSEND U-HAUL J# 6589 42 | P a g e ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0000 0.0000 2 0.0000 0.0000 3 0.0000 0.0000 4 0.0000 0.0000 5 0.0000 0.0000 6 0.0000 0.0000 7 0.0000 0.0000 8 0.0000 0.0000 9 0.0000 0.0000 10 0.0000 0.0000 11 0.0000 0.0000 12 0.0000 0.0000 13 0.0000 0.0000 14 0.0000 0.0000 15 0.0000 0.0000 16 0.0000 0.0000 17 0.0000 0.0000 18 0.0000 0.0000 19 0.0000 0.0000 20 0.0000 0.0000 21 0.0000 0.0000 22 0.0000 0.0000 23 0.0000 0.0000 24 0.0000 0.0000 25 0.0000 0.0000 26 0.0000 0.0000 27 0.0000 0.0000 28 0.0000 0.0000 29 0.0000 0.0000 30 0.0000 0.0000 31 0.0000 0.0000 32 0.0000 0.0000 33 0.0000 0.0000 34 0.0000 0.0000 35 0.0000 0.0000 36 0.0000 0.0000 37 0.0000 0.0000 38 0.0000 0.0000 39 0.0000 0.0000 40 0.0000 0.0000 41 0.0000 0.0000 42 0.0000 0.0000 43 0.0000 0.0000 44 0.0000 0.0000 45 0.0000 0.0000 46 0.0000 0.0000 47 0.0000 0.0000 48 0.0000 0.0000 49 0.0000 0.0000 50 0.0000 0.0000 51 0.0000 0.0000 52 0.0000 0.0000 53 0.0000 0.0000 PORT TOWNSEND U-HAUL J# 6589 43 | P a g e 54 0.0000 0.0000 55 0.0000 0.0000 56 0.0000 0.0000 57 0.0000 0.0000 58 0.0000 0.0000 59 0.0000 0.0000 60 0.0000 0.0000 61 0.0000 0.0000 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0000 527 0 0 Pass 0.0000 509 0 0 Pass 0.0000 483 0 0 Pass 0.0000 461 0 0 Pass 0.0000 438 0 0 Pass 0.0000 413 0 0 Pass 0.0000 389 0 0 Pass 0.0000 371 0 0 Pass 0.0000 353 0 0 Pass 0.0000 331 0 0 Pass 0.0000 322 0 0 Pass 0.0000 310 0 0 Pass 0.0000 296 0 0 Pass 0.0000 288 0 0 Pass 0.0000 272 0 0 Pass 0.0000 257 0 0 Pass 0.0000 246 0 0 Pass 0.0000 240 0 0 Pass 0.0000 226 0 0 Pass 0.0000 212 0 0 Pass 0.0000 202 0 0 Pass 0.0000 192 0 0 Pass 0.0000 184 0 0 Pass 0.0000 169 0 0 Pass 0.0000 159 0 0 Pass 0.0000 154 0 0 Pass 0.0000 151 0 0 Pass 0.0000 146 0 0 Pass 0.0000 139 0 0 Pass 0.0000 135 0 0 Pass 0.0000 134 0 0 Pass 0.0000 124 0 0 Pass 0.0000 115 0 0 Pass 0.0000 109 0 0 Pass 0.0000 107 0 0 Pass 0.0000 103 0 0 Pass 0.0000 99 0 0 Pass 0.0000 98 0 0 Pass 0.0000 94 0 0 Pass 0.0000 86 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 44 | P a g e 0.0000 80 0 0 Pass 0.0000 75 0 0 Pass 0.0000 74 0 0 Pass 0.0000 70 0 0 Pass 0.0000 68 0 0 Pass 0.0000 60 0 0 Pass 0.0000 55 0 0 Pass 0.0000 51 0 0 Pass 0.0000 49 0 0 Pass 0.0000 48 0 0 Pass 0.0000 47 0 0 Pass 0.0000 40 0 0 Pass 0.0000 35 0 0 Pass 0.0000 32 0 0 Pass 0.0000 28 0 0 Pass 0.0000 23 0 0 Pass 0.0000 22 0 0 Pass 0.0000 20 0 0 Pass 0.0000 17 0 0 Pass 0.0000 15 0 0 Pass 0.0000 12 0 0 Pass 0.0000 8 0 0 Pass 0.0000 4 0 0 Pass 0.0000 4 0 0 Pass 0.0000 4 0 0 Pass 0.0000 3 0 0 Pass 0.0000 1 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0000 0 0 0 Pass 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 45 | P a g e 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass 0.0001 0 0 0 Pass ___________________________________________________________________ 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 retention 1 POC N 19.26 N 100.00 Total Volume Infiltrated 19.26 0.00 0.00 100.00 0.00 0% No Treat. Credit Compliance with LID Standard 8 Duration Analysis Result = Passed ___________________________________________________________________ D. INFILTRATION SYSTEM #3 Rooftop drains from Buildings G and J drain to an infiltration system located in the southwest corner of the site. The area draining to the infiltration system is 17,400 square feet (0.40 acres). The system consists of 108 linear feet of 36” diameter perforated tank in a rock lined trench. Access risers will be placed at the end of the tanks without the infiltration manhole to provide access. The infiltration rate is 10 inches per hour which includes the pre-calculated safety factor calculated by Terracon. The peak stage for the tank is 2.21’ providing a 0.79’ of freeboard. a. Infiltration Trench #3Report WWHM2012 PROJECT REPORT ___________________________________________________________________ Project Name: INFILTRATION SW CORNER 4-21 Site Name: PT UHAUL Site Address: City : Report Date: 4/12/2021 Gage : Port Angeles Data Start : 1948/10/01 Data End : 2009/09/30 Precip Scale: 0.80 Version Date: 2019/09/13 Version : 4.2.17 ___________________________________________________________________ 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 PORT TOWNSEND U-HAUL J# 6589 46 | P a g e A B, Forest, Mod .4 Pervious Total 0.4 Impervious Land Use acre Impervious Total 0 Basin Total 0.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater ___________________________________________________________________ MITIGATED LAND USE Name : Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.4 Impervious Total 0.4 Basin Total 0.4 ___________________________________________________________________ Element Flows To: Surface Interflow Groundwater Tank 1 Tank 1 ___________________________________________________________________ Name : Tank 1 Tank Name: Tank 1 Dimensions Depth: 3 ft. Tank Type : Circular Diameter : 3 ft. Length : 108 ft. Infiltration On Infiltration rate: 10 Infiltration safety factor: 1 Total Volume Infiltrated (ac-ft.): 28.7 Total Volume Through Riser (ac-ft.): 0 Total Volume Through Facility (ac-ft.): 28.7 Percent Infiltrated: 100 Total Precip Applied to Facility: 0 Total Evap From Facility: 0 Discharge Structure Riser Height: 3 ft. Riser Diameter: 1000 in. Element Flows To: PORT TOWNSEND U-HAUL J# 6589 47 | P a g e Outlet 1 Outlet 2 ___________________________________________________________________ Tank Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.000 0.000 0.000 0.000 0.0333 0.001 0.000 0.000 0.015 0.0667 0.002 0.000 0.000 0.022 0.1000 0.002 0.000 0.000 0.026 0.1333 0.003 0.000 0.000 0.030 0.1667 0.003 0.000 0.000 0.034 0.2000 0.003 0.000 0.000 0.037 0.2333 0.004 0.000 0.000 0.040 0.2667 0.004 0.000 0.000 0.042 0.3000 0.004 0.000 0.000 0.045 0.3333 0.004 0.001 0.000 0.047 0.3667 0.004 0.001 0.000 0.049 0.4000 0.005 0.001 0.000 0.051 0.4333 0.005 0.001 0.000 0.052 0.4667 0.005 0.001 0.000 0.054 0.5000 0.005 0.001 0.000 0.055 0.5333 0.005 0.002 0.000 0.057 0.5667 0.005 0.002 0.000 0.058 0.6000 0.006 0.002 0.000 0.060 0.6333 0.006 0.002 0.000 0.061 0.6667 0.006 0.002 0.000 0.062 0.7000 0.006 0.003 0.000 0.063 0.7333 0.006 0.003 0.000 0.064 0.7667 0.006 0.003 0.000 0.065 0.8000 0.006 0.003 0.000 0.066 0.8333 0.006 0.004 0.000 0.067 0.8667 0.006 0.004 0.000 0.068 0.9000 0.006 0.004 0.000 0.068 0.9333 0.006 0.004 0.000 0.069 0.9667 0.007 0.004 0.000 0.070 1.0000 0.007 0.005 0.000 0.070 1.0333 0.007 0.005 0.000 0.071 1.0667 0.007 0.005 0.000 0.071 1.1000 0.007 0.005 0.000 0.072 1.1333 0.007 0.006 0.000 0.072 1.1667 0.007 0.006 0.000 0.073 1.2000 0.007 0.006 0.000 0.073 1.2333 0.007 0.006 0.000 0.073 1.2667 0.007 0.007 0.000 0.074 1.3000 0.007 0.007 0.000 0.074 1.3333 0.007 0.007 0.000 0.074 1.3667 0.007 0.007 0.000 0.074 1.4000 0.007 0.008 0.000 0.074 1.4333 0.007 0.008 0.000 0.074 1.4667 0.007 0.008 0.000 0.075 1.5000 0.007 0.008 0.000 0.075 1.5333 0.007 0.009 0.000 0.075 1.5667 0.007 0.009 0.000 0.075 1.6000 0.007 0.009 0.000 0.075 1.6333 0.007 0.009 0.000 0.075 1.6667 0.007 0.010 0.000 0.075 1.7000 0.007 0.010 0.000 0.075 PORT TOWNSEND U-HAUL J# 6589 48 | P a g e 1.7333 0.007 0.010 0.000 0.075 1.7667 0.007 0.010 0.000 0.075 1.8000 0.007 0.011 0.000 0.075 1.8333 0.007 0.011 0.000 0.075 1.8667 0.007 0.011 0.000 0.075 1.9000 0.007 0.011 0.000 0.075 1.9333 0.007 0.011 0.000 0.075 1.9667 0.007 0.012 0.000 0.075 2.0000 0.007 0.012 0.000 0.075 2.0333 0.007 0.012 0.000 0.075 2.0667 0.006 0.012 0.000 0.075 2.1000 0.006 0.013 0.000 0.075 2.1333 0.006 0.013 0.000 0.075 2.1667 0.006 0.013 0.000 0.075 2.2000 0.006 0.013 0.000 0.075 2.2333 0.006 0.014 0.000 0.075 2.2667 0.006 0.014 0.000 0.075 2.3000 0.006 0.014 0.000 0.075 2.3333 0.006 0.014 0.000 0.075 2.3667 0.006 0.014 0.000 0.075 2.4000 0.006 0.015 0.000 0.075 2.4333 0.005 0.015 0.000 0.075 2.4667 0.005 0.015 0.000 0.075 2.5000 0.005 0.015 0.000 0.075 2.5333 0.005 0.015 0.000 0.075 2.5667 0.005 0.016 0.000 0.075 2.6000 0.005 0.016 0.000 0.075 2.6333 0.004 0.016 0.000 0.075 2.6667 0.004 0.016 0.000 0.075 2.7000 0.004 0.016 0.000 0.075 2.7333 0.004 0.016 0.000 0.075 2.7667 0.004 0.016 0.000 0.075 2.8000 0.003 0.017 0.000 0.075 2.8333 0.003 0.017 0.000 0.075 2.8667 0.003 0.017 0.000 0.075 2.9000 0.002 0.017 0.000 0.075 2.9333 0.002 0.017 0.000 0.075 2.9667 0.001 0.017 0.000 0.075 3.0000 0.000 0.017 0.000 0.075 3.0333 0.000 0.000 5.386 0.075 ___________________________________________________________________ ANALYSIS RESULTS Stream Protection Duration ___________________________________________________________________ Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.4 Total Impervious Area:0 ___________________________________________________________________ Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.4 ___________________________________________________________________ Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.000224 5 year 0.000312 PORT TOWNSEND U-HAUL J# 6589 49 | P a g e 10 year 0.000356 25 year 0.000399 50 year 0.000424 100 year 0.000444 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0 5 year 0 10 year 0 25 year 0 50 year 0 100 year 0 ___________________________________________________________________ Stream Protection Duration Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.000 0.000 1950 0.000 0.000 1951 0.000 0.000 1952 0.000 0.000 1953 0.000 0.000 1954 0.000 0.000 1955 0.000 0.000 1956 0.000 0.000 1957 0.000 0.000 1958 0.000 0.000 1959 0.000 0.000 1960 0.000 0.000 1961 0.000 0.000 1962 0.000 0.000 1963 0.000 0.000 1964 0.000 0.000 1965 0.000 0.000 1966 0.000 0.000 1967 0.000 0.000 1968 0.000 0.000 1969 0.000 0.000 1970 0.000 0.000 1971 0.000 0.000 1972 0.000 0.000 1973 0.000 0.000 1974 0.000 0.000 1975 0.000 0.000 1976 0.000 0.000 1977 0.000 0.000 1978 0.000 0.000 1979 0.000 0.000 1980 0.000 0.000 1981 0.000 0.000 1982 0.000 0.000 1983 0.000 0.000 1984 0.000 0.000 1985 0.000 0.000 1986 0.000 0.000 1987 0.000 0.000 1988 0.000 0.000 PORT TOWNSEND U-HAUL J# 6589 50 | P a g e 1989 0.000 0.000 1990 0.000 0.000 1991 0.000 0.000 1992 0.000 0.000 1993 0.000 0.000 1994 0.000 0.000 1995 0.000 0.000 1996 0.000 0.000 1997 0.000 0.000 1998 0.000 0.000 1999 0.000 0.000 2000 0.000 0.000 2001 0.000 0.000 2002 0.000 0.000 2003 0.000 0.000 2004 0.000 0.000 2005 0.000 0.000 2006 0.000 0.000 2007 0.000 0.000 2008 0.000 0.000 2009 0.000 0.000 ___________________________________________________________________ Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0003 0.0000 2 0.0003 0.0000 3 0.0003 0.0000 4 0.0003 0.0000 5 0.0003 0.0000 6 0.0003 0.0000 7 0.0003 0.0000 8 0.0003 0.0000 9 0.0003 0.0000 10 0.0003 0.0000 11 0.0003 0.0000 12 0.0003 0.0000 13 0.0003 0.0000 14 0.0003 0.0000 15 0.0003 0.0000 16 0.0003 0.0000 17 0.0003 0.0000 18 0.0003 0.0000 19 0.0003 0.0000 20 0.0003 0.0000 21 0.0003 0.0000 22 0.0003 0.0000 23 0.0003 0.0000 24 0.0003 0.0000 25 0.0003 0.0000 26 0.0003 0.0000 27 0.0003 0.0000 28 0.0003 0.0000 29 0.0003 0.0000 30 0.0002 0.0000 31 0.0002 0.0000 PORT TOWNSEND U-HAUL J# 6589 51 | P a g e 32 0.0002 0.0000 33 0.0002 0.0000 34 0.0002 0.0000 35 0.0002 0.0000 36 0.0002 0.0000 37 0.0002 0.0000 38 0.0002 0.0000 39 0.0002 0.0000 40 0.0002 0.0000 41 0.0002 0.0000 42 0.0002 0.0000 43 0.0002 0.0000 44 0.0002 0.0000 45 0.0002 0.0000 46 0.0002 0.0000 47 0.0002 0.0000 48 0.0002 0.0000 49 0.0002 0.0000 50 0.0002 0.0000 51 0.0002 0.0000 52 0.0002 0.0000 53 0.0001 0.0000 54 0.0001 0.0000 55 0.0001 0.0000 56 0.0001 0.0000 57 0.0001 0.0000 58 0.0001 0.0000 59 0.0001 0.0000 60 0.0000 0.0000 61 0.0000 0.0000 ___________________________________________________________________ Stream Protection Duration POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0001 527 0 0 Pass 0.0001 507 0 0 Pass 0.0001 481 0 0 Pass 0.0001 461 0 0 Pass 0.0001 438 0 0 Pass 0.0001 415 0 0 Pass 0.0001 392 0 0 Pass 0.0001 369 0 0 Pass 0.0001 349 0 0 Pass 0.0001 331 0 0 Pass 0.0001 323 0 0 Pass 0.0001 313 0 0 Pass 0.0001 297 0 0 Pass 0.0002 291 0 0 Pass 0.0002 272 0 0 Pass 0.0002 258 0 0 Pass 0.0002 248 0 0 Pass 0.0002 239 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 52 | P a g e 0.0002 226 0 0 Pass 0.0002 212 0 0 Pass 0.0002 199 0 0 Pass 0.0002 189 0 0 Pass 0.0002 184 0 0 Pass 0.0002 169 0 0 Pass 0.0002 159 0 0 Pass 0.0002 154 0 0 Pass 0.0002 151 0 0 Pass 0.0002 146 0 0 Pass 0.0002 139 0 0 Pass 0.0002 135 0 0 Pass 0.0002 134 0 0 Pass 0.0002 125 0 0 Pass 0.0002 118 0 0 Pass 0.0002 109 0 0 Pass 0.0002 107 0 0 Pass 0.0002 103 0 0 Pass 0.0002 99 0 0 Pass 0.0002 98 0 0 Pass 0.0002 94 0 0 Pass 0.0002 86 0 0 Pass 0.0002 79 0 0 Pass 0.0002 75 0 0 Pass 0.0002 74 0 0 Pass 0.0002 70 0 0 Pass 0.0003 68 0 0 Pass 0.0003 63 0 0 Pass 0.0003 56 0 0 Pass 0.0003 51 0 0 Pass 0.0003 49 0 0 Pass 0.0003 48 0 0 Pass 0.0003 46 0 0 Pass 0.0003 40 0 0 Pass 0.0003 37 0 0 Pass 0.0003 31 0 0 Pass 0.0003 28 0 0 Pass 0.0003 23 0 0 Pass 0.0003 22 0 0 Pass 0.0003 20 0 0 Pass 0.0003 17 0 0 Pass 0.0003 15 0 0 Pass 0.0003 11 0 0 Pass 0.0003 8 0 0 Pass 0.0003 4 0 0 Pass 0.0003 4 0 0 Pass 0.0003 4 0 0 Pass 0.0003 3 0 0 Pass 0.0003 1 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass 0.0003 0 0 0 Pass PORT TOWNSEND U-HAUL J# 6589 53 | P a g e 0.0003 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass 0.0004 0 0 0 Pass ___________________________________________________________________ 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 Tank 1 POC N 26.12 N 100.00 Total Volume Infiltrated 26.12 0.00 0.00 100.00 0.00 0% No Treat. Credit Compliance with LID Standard 8 Duration Analysis Result = Passed ___________________________________________________________________ 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. PORT TOWNSEND U-HAUL J# 6589 54 | P a g e VI. SILT AND EROSION CONTROL An engineered Storm Water Pollution Prevention Plan is included with the construction plan set with details, notes and references to Best Management Practices. The Best Management Practices (BMP’s) include, but are not limited to: temporary sediment traps, siltation control ditches, silt fence, gravel filter berms and filter sock catch basin liners. Clearing limits will be clearly marked prior to any on-site activity. A Stormwater Pollution Prevention Narrative is included with this report attached hereto. D R A I N A G E P R O F I L E S P O R T T O W N S E N D U - H A U L T h e c i v i l d e s i g n d r a w i n g s h a v e n o t b e e n r e v i e w e d f o r s t o r m - w a t e r , e n v i r o n m e n t a l o r a n y o t h e r c i v i l e n g i n e e r i n g r e q u i r e m e n t s o r s t a n d a r d s . C o d e P r o s ' r e v i e w i s s t r i c t l y l i m i t e d t o r e v i e w f o r c o m p l i a n c e w i t h t h e W a s h i n g t o n S t a t e B u i l d i n g C o d e , i n c l u d i n g t h e 2 0 1 5 I n t e r n a t i o n a l B u i l d i n g C o d e , 2 0 1 5 I n t e r n a t i o n a l M e c h a n i c a l C o d e , 2 0 1 5 U n i f o r m P l u m b i n g C o d e a n d t h e 2 0 1 5 W a s h i n g t o n S t a t e E n e r g y C o d e a s a m e n d e d a n d a d o p t e d b y J e f f e r s o n C o u n t y a n d t h e S t a t e o f W a s h i n g t o n . B y M i c h a e l J . B a r t h , M . C . P . a t 1 : 2 7 p m , N o v 0 1 , 2 0 2 1 D R A I N A G E D E T A I L S a n d N O T E S P O R T T O W N S E N D U - H A U L T h e c i v i l d e s i g n d r a w i n g s h a v e n o t b e e n r e v i e w e d f o r s t o r m - w a t e r , e n v i r o n m e n t a l o r a n y o t h e r c i v i l e n g i n e e r i n g r e q u i r e m e n t s o r s t a n d a r d s . C o d e P r o s ' r e v i e w i s s t r i c t l y l i m i t e d t o r e v i e w f o r c o m p l i a n c e w i t h t h e W a s h i n g t o n S t a t e B u i l d i n g C o d e , i n c l u d i n g t h e 2 0 1 5 I n t e r n a t i o n a l B u i l d i n g C o d e , 2 0 1 5 I n t e r n a t i o n a l M e c h a n i c a l C o d e , 2 0 1 5 U n i f o r m P l u m b i n g C o d e a n d t h e 2 0 1 5 W a s h i n g t o n S t a t e E n e r g y C o d e a s a m e n d e d a n d a d o p t e d b y J e f f e r s o n C o u n t y a n d t h e S t a t e o f W a s h i n g t o n . B y M i c h a e l J . B a r t h , M . C . P . a t 1 : 2 7 p m , N o v 0 1 , 2 0 2 1