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APPROVED FULL DRAINAGE REPORT BLD2018-1267FULL DRAINAGE REPORT FOR HICKS CHILDREN'S TRUST (PROPOSED SINGLE-FAMILY RESIDENCE) DATE: /' f COMPLIES WITH APPLICABLE CITY ST R CO E Prepared by: Rodney Pfiefle, EIT Date: September 14, 2018 Revised: June 13, 2019 MAC #: 180453 IgLop 19 an 12(P7 PO Bog 177 Silvana, WA 98287 Tel: 360-652-5820 � � S E-Mail. macengineering(a,frontier.com JUN 14 2019 BUILDING OF EDMONDNP S TABLE OF CONTENTS DRAINAGE INFORMATION SUMMARY FORM SECTION I EXECUTIVE SUMMARY EXISTING SITE CONDITIONS DEVELOPED SITE CONDITIONS OFF -SITE ANALYSIS COMPLIANCE WITH APPLICABLE MINIMUM REQUIREMENTS SECTION II SWPPP ELEMENTS SECTION III SITE CALCULATIONS SECTION IV OPERATION AND MAINTENANCE SECTION V USDA NRCS SOILS MAP AND DESCRIPTIONS MAC ENGINEERING SOIL LOG AMENDED SOILS CALCULATIONS APPENDIX FIGURE 1: EXISTING SITE PLAN FIGURE 2: SITE PHOTOGRAPHS FIGURE 3: DEVELOPED SITE PLAN FIGURE 4: OFF -SITE BASIN MAP FIGURE 5: MINIMUM REQUIREMENTS FLOW CHART FIGURE 6: SOIL BORING LOCATION 1 2 2 3 4 DRAINAGE INFORMATION SUMMARY FORM Project Total Area: 0.42 acres Project Development Area: 0.40 acres Number of Lots (if applies): N/A Summary Table Drainage Basin Information Individual Basin Information SITE On -Site Sub -Basin Area (ac) 0.42 Type of Storage Proposed Dispersion Soil Type(s) On Developed Site Alderwood-Urban Pre -developed Runoff Rates Q (cfs) 2 yr. 0.007 10 yr. 0.013 50 yr. 0.017 Post -development Runoff Rates (without quantity controls) Q (cfs) 2 yr. 0.048 10 yr. 0.094 50 yr. 0.156 Post -development Runoff Rates (with quantity controls) Q (cfs) 2 yr. 0.016 10 yr. 0.049 50 yr. 0.112 Offsite Upstream Area (ac) Number of acres N/A Additional Offsite Flow Q (cfs) 50 yr. N/A Refer to Calculations SECTION I EXECUTIVE SUMMARY The data provided in this Full Drainage Report will be included as a part of the Stormwater Site Plan and Stormwater Pollution Prevention Plan (SWPPP). This additional technical information is provided for the purpose of evaluating the proposed new development and to comply with the minimum requirements set forth by the City of Edmonds Stormwater Management Code (ECDC 18.30) and Stormwater Addendum, and Department of Ecology Stormwater Management Manual for Western Washington (SMMWW) 2012 (2014 amended). The project site is located along the west side of Olympic Ave, approximately 1200 ft south of the intersection with Puget Dr, in Snohomish County, Washington. The project site is approximately 0.42 acres. In the area of development, ground slopes range from 0% to 15%. The site is currently vacant land with an existing asphalt driveway to be removed. The majority of the site is covered with weeds and grasses. On -site soils in the area of development are consistent with cementitious and restrictive silty sand and gravel material. On -site storm water appears to sheet flow and infiltrate into the existing native vegetated areas. The proposed new development will consist of a 3,892 sf (w/ overhang) single-family residence (SFR), and a 1,605 sf concrete driveway and parking area. Storm water run-off from the SFR and driveway will be tightlined to a dispersion system to manage storm water, thus recharging the ground water table. Due to the type soil on site, together with other BMPs used on this proposed project, it is expected to meet the intent to provide both flow control and storm water treatment. For additional detail and information refer to the content and body of this report. EXISTING SITE CONDITIONS The project site is located along the west side of Olympic Ave, approximately 1200 ft south of the intersection with Puget Dr, at 1001 Olympic Ave, Edmonds, Washington, within Snohomish County (Parcel #: 00548900001203). The project site is approximately 0.42 acres. In the area of development, ground slopes range from 0% to 15%. The site is currently vacant land with an existing asphalt driveway to be removed. The majority of the site is covered with weeds and grasses. (Figure l: Existing Site Plan). The site takes access from Olympic Ave. The natural discharge location for the site is on the western boundary of the property (Figure 2: Site Photographs). Aerial imagery indicates that previous development was removed between May 2017 and May 2018. Natural Resources Conservation Service (MRCS) Soil May (Refer to Section V) indicates on -site soils are consistent with Alderwood-Urban land complex. Alderwood-Urban soils are a gravelly ashy sandy loam material that was derived from basal till and is commonly found on till plains. Alderwood-Urban soils are moderately well drained material with a hydrologic soil group `B". Mac Engineering dug a Test Pit (TP) inside the area of development on September 5, 2018. Several attempts were made to dig the TP. On -site soils were not found to be consistent with Alderwood-Urban soil and instead appeared as Alderwood gravelly sandy loam (Refer to Section V: Mac Engineering Soil Log). The site appears to be stripped of top soil and the remaining soil is a very restrictive till -like silty sand material with very little organic material. Mac Engineering estimates that the actual hydrologic soil group is "C" and that the soil is not reasonably suitable for an infiltration system. Based on on -site field observations and sub -surface exploration, storm water run-off disperses and infiltrates into the existing native vegetation. There are no erosion issues present within the project site area. DEVELOPED SITE CONDITIONS The proposed project consists of construction of a new SFR and a concrete driveway/parking area. Storm water drainage analysis and flow controls, used to achieve best management practices (BMPs), designed for this proposed development will comply with the minimum requirements set by ECDC 18.30 and SMMWW Volume III and V. The proposed SFR (3,892 sf w/overhang) is classified as non -pollution generating impervious surface (NPGIS). The proposed SFR will be located in the central portion of the parcel (Figure 3: Developed Site Plan). The SFR will also have an additional 103 sf of uncovered concrete patio and porch. Storm water run-off from the proposed SFR will utilize downspout dispersion per SMMWW Volume III, Section 3.1.1 BMP T5.10B. The proposed building will have a minimum of 6 downspouts to be tightlined to the west and discharge into two 40 ft dispersion trenches. The dispersion trenches will be installed per ECDC 18.30 and COE Std Detail SD-632. The proposed concrete driveway/parking area (1,605 sf) is classified as pollution generating impervious surface (PGIS). The proposed driveway/parking area will take access from Olympic Ave (See Figure 3). Storm water iun-off from the driveway/parking area will sheet flow to trench drains and be tightlined to the downspout dispersion system. Proposed vegetation (lawn), amended soil, and a minimum 50 ft flowpath through the vegetation will ensure water treatment and quality per SMMWW Volume V, Section 5.3.1 BMP T5.13. The total area of proposed NPGIS and PGIS equals 5,600 sf. The dispersion trenches are sized at 10 ft of trench for every 700 sf of impervious surface. This equates to 80 ft of dispersion trench in total. Western Washington Hydrology Model (WWHM2012) with "Puget East 36" precipitation time series was used to analyze the volume of storm water entering the dispersion trenches. The combination of the proposed SFR and concrete driveway/parking area will have a peak flow rate (100 year return period) of 0.155 CFS. Compared to predeveloped conditions, this is a net increase of 0.137 CFS (See Attached: Site Calculations). Storm water run-off will sheet flow to the west through landscape vegetation and infiltrate into the ground; thus recharging the ground water table. There is a minimum 50 ft flow path from the discharge point to the nearest property line per SMMWW Volume V, Section 5.3.1 BMP T5.12. This allows the entire developed site to be modeled as lawn. All on -site disturbed areas, not covered with impervious surface, will be amended with top soil in accordance with SMMWW Volume V, BMP T5.13. Due to the type of soils and vegetation on site, the distance from the developed area to the property line, and the BMP's used on this proposed project, it is expected to meet the intent to provide both flow control and storm water treatment. OFF -SITE ANALYSIS Upstream Analysis: Based on, on -site field observations and county contour maps, there is no upstream basin area associated with the parcel (Figure 4: Off -Site Drainage Map). The existing pavement on Olympic Ave has a thickened edge that prevents road runoff from sheet flowing onto the parcel. Downstream Analysis: Storm water run-off that discharges from the site will do so along the western boundary of the property. It is assumed that the run-off will flow up to 50 ft through existing native vegetation before infiltrating into the ground (Figure 4). The proposed project will not have an adverse impact to downstream properties. COMPLIANCE WITH APPLICABLE MINIMUM REQUIREMENTS Based on Edmonds Stormwater Addendum, Section 3, Figure 3.1 (Figure 5: Minimum Requirements) this proposed new development project will comply with Minimum Requirements # 1 through #9. The purpose of the requirements is to prevent and control adverse impacts of the drainage and stormwater on the public health, safety and general welfare. To meet these requirements, a Construction Storm Water Pollution Prevention Plan (SWPPP) has been provided. The following addresses Minimum Requirements 1 to 9: Minimum Requirement #1: Preparation of stormwater site plan A Stormwater Site Plan/Building Site Plan has been prepared. Minimum Requirement #2: Stormwater Pollution Prevention Plans (SWPPP) SWPPP drawings and the required elements have been prepared and are a stand-alone document from this report. The BMP's indicated on the plans will be implemented during construction. Additional BMP's may be used on the site depending upon weather conditions. Minimum Requirement #3: Source Control of Pollution Dining construction SWPPP BMP's will be implemented, based on SMMWW Volume IV, Chapter 5, as shown on the SWPP plans. This project is not required to have source control BMP's after construction is completed. Minimum Requirement #4: Preservation of natural drainage and outfalls The proposed site development is not expected to have off -site drainage impacts. This project will disperse storm water run-off from the natural drainage location. On -site BMPs will be used to mitigate potential erosion issues and control run-off. For more information about BMP details and placement please refer to Section I of this report and Site Plans associated with this project. Minimum Requirement #5: On -site Stormwater Management The proposed project triggers Minimum Requirements 1 through 9, the site is located inside the Urban Growth Area (UGA) on a parcel less than 5.0 acres; therefore, the proposed project will use on -site BMPs fiom List 2 of SMMWW Volume I, Section 2.5.5 to mitigate storm water run-off. • Full Dispersion is infeasible due to the location of the project site • Downspout Full Infiltration System is infeasible due to restrictive soil • Permeable Pavement is infeasible due to restrictive soil and slope >10% • Downspout Dispersion is feasible in accordance with BMP T5.10B Minimum Requirement #6: Runoff Treatment The proposed project concrete driveway will add less than 5,000 sf of PGIS; therefore, a storm water treatment facility is not required. Storm water run-off from the proposed driveway will sheet flow through vegetation for a minimum of 50 ft per BMP T5.13 to meet water quality requirements through imported and amended soils. Minimum Reauirement #7: Flow Control Flow control shall be provided for the proposed project if any of the following thresholds are meet: • 10,000 sf or more of effective impervious surface o The proposed project does not exceed 10,000 sf of effective impervious surface. • 3/4 acres of more of forest converted to lawn or landscape and surface water is discharged from the site into a conveyance system of receiving water o The proposed project does not convert forest to lawn. • 2.5 acres of forest converted to pasture and surface water is discharged from the site into a conveyance system or receiving water o The proposed project does not convert forest to pasture. • A combination of hard surfaces and converted pervious surfaces cause a 0.1 CFS, one -hour time step, or 0.15 CFS, 15-minute time steps, or greater increase in the 100 year flow frequency from a threshold discharge area as estimated using W WHM o WWHM2012 (15-minute time step) was used to determine the pre - developed and mitigated discharge volumes from the site under developed conditions. The proposed project will not increase storm water run-off, for the 100 year return period, more than 0.15 CFS. Predeveloped run-off for the 100 year return period is 0.018 CFS. Mitigated run-off for the 100 year return period is 0.155 CFS for a net increase of 0.137 CFS. Calculations are found in Section III of this report. Minimum Requirement #8: Wetlands Protection No development will occur within any off -site wetland or its buffer. Storm water run-off from the proposed development will not discharge to an on -site or off -site stream. Minimum Reauirement #9: Operation and Maintenance Refer to Section IV of this report for operation and maintenance requirements. SECTION II SWPPP ELEMENTS 1— PRESERVE VEGETATION/MARK CLEARING LIMITS The land disturbance activities for development requires the consideration to be given to minimize the removal of existing trees, disturbance and compaction of native soils, except as needed for building purposes. The duff layer, native soil and vegetation shall be retained in an undisturbed state to the minimum degree practicable. Best Management Practices fflMPs) to be used: • BMP C101: Preserving Natural Vegetation • BMP C 103: High Visibility Fence • BMP C233: Silt Fence 2-ESTABLISH CONSTRUCTION ACCESS A temporary construction entrance is not required. Best Management Practices (BMPs)to be used: • BMP C 105: Stabilized Construction Entrance 3-CONTROL FLOW RATES Flow rates will be controlled by using SWPPP Element #4, sediment controls. 4-INSTALL SEDIMENT CONTROLS Due to the permeability of the site soils, surface flows from the site are expected to be negligible and therefore no sediment controls are needed. If the contractor notices that dirty storm water is leaving the site, then the contractor shall place silt fencing down slope from the disturbed areas as shown on the SWPPP. Best Management Practices (BMPs) to be used: • BMP C233: Silt Fence 5-STABILIZED SOILS We do not expect any stockpiles on this project. All new exposed areas are expected to be covered with sand or building within 48 hours of exposure. If required, all exposed soil and any soil stockpile will be stabilized. The soil stockpile will be located within the disturbed area shown on the SWPPP plan. Any stockpiles will be covered in plastic if left un-worked. No soils shall remain exposed and unworked for more than 2 days between October 1 and April 30. Any land disturbed areas outside of the proposed horse arena will be permanently seeded. Best Management Practices (BMPs) to be used: • BMP C 120: Temporary & Permanent Seeding • BMP C 123 : Plastic Covering • BMP C 140: Dust Control 6-PROTECT SLOPES There are no cut or fill slopes with this project. Best Management Practices (BMPs) to be used: • BMP C 120: Temporary & Permanent Seeding • BMP C 121: Mulching 7-PROTECT PERMANENT DRAIN INLETS Inlet protection shall be installed in all catch basins and remain until construction has been completed. Inlet protection shall in inspected regularly and the filter fabric cleaned and/or replaced as necessary. When providing maintenance to the inlet projection, the fabric shall be removed in such a way as to not allow the retained sediment to fall into the catch basin. Best Management Practices (BMPs) to be used: • BMP C220: Inlet Protection 8-STABILIZE CHANNELS AND OUTLETS There are no existing channels and the proposed construction does not create new channels. Best Management Practices (BMPs) to be used: • None Required 9-CONTROL POLLUTANTS Any and all chemicals, liquid projects, petroleum projects, and other materials that have the potential to pose a threat to human or the environment will be covered, contained and protected from vandalism. All such products will either be locked in a trailer or locked in a leak proof container. Any on -site fueling will have secondary containment to prevent possibility of spills. Any heavy equipment/vehicles will only be on -site temporarily. Any spills will be cleaned immediately. Fertilizers and pesticides will be applied per the manufacturers label requirements for application rate and procedures. No pH modifying sources such as cement kiln dust, fly ash, concrete washing treatment, curing waters, etc. are anticipated; if however they are, we will contain and/or remove the polluted substance from the site per manufacturer's recommendations. Best Management Practices (BMPs) to be used: • BMP C 151: Concrete Handling • BMP C153: Material, Delivery, Storage and Containment 10-CONTROL. DEWATERING For the proposed building, dewatering is not expected to be required; thus, dewatering control will not be required for this project. Best Management Practices (BMPs) to be used: • None Required 11-MAINTAIN BEST MANAGEMENT PRACTICES BMPs will be inspected and maintained after storms and during construction. 12-MANAGE THE PROJECT This SWPPP will be implemented at all times and will be modified whenever there is a significant change to the site conditions. The Erosion control BMPs will be implemented hi the following sequence: Best Management Practices (BMPs) to be used: • BMP C 162: Scheduling 1. Mark the clearing limits. 2. Establish staging areas for storage and handling polluted materials and BMPs. 3. Install sediment control BMPs. 4. Hand grade and install stabilization measure for disturbed areas 5. Maintain BMPs until final site stabilization, at which time they may be removed. 13-PROTECT ON -SITE STORMWATER BMPS On -site storm water BMPs, existing and proposed, will be protected at all times from siltation and compaction during construction. The approved plans have both construction sequencing and appropriate SWPPP BMPs to minimize the risk to storm water BMPs. Best Management Practices (BMPs) to be used: • BMP C103: High Visibility Fence • BMP C233: Silt Fence SECTION III General Model Information Project Name: 19-03-13-WWHM2012-SITE CALCS-180453 Site Name: HICKS SFR SITE CALCS Site Address: 1001 OLYMPIC AVE City: EDMONDS Report Date: 6/11 /2019 MGS Region: Puget East Data Start: 1901/10/01 00:00 Data End: 2058/09/30 00:00 Timestep: 15 Minute DOT Data Number03 Version Date: 2016/11/23 Version: 4.2.13 POC Thresholds Low Flow Threshold for POC1: 50 Percent of the 2 Year High Flow Threshold for POC1: 50 Year 19-03-13-VVWHM2012-SITE CALCS-180453 6/11/2019 3:12:08 PM Page 2 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass: No Groundwater: No Pervious Land Use acre C, Forest, Mod 0.42 Pervious Total 0.42 Impervious Land Use acre Impervious Total 0 Basin Total 0.42 Element Flows To: Surface Interflow Groundwater 19-03-13-VWVHM2012-SITE CALCS-180453 6/11/2019 3:12:08 PM page 3 Mitigated Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Lawn, Mod 0.42 Pervious Total 0.42 Impervious Land Use acre Impervious Total 0 Basin Total 0.42 Element Flows To: Surface Interflow Groundwater n . A 19-03-13-VWWW2012-SITE CALCS-180453 6/11/2019 3:12:08 PM �1 Page 4 s w ,J Routing Elements Predeveloped Routing 19-03••13-WWHM2012-SITE CALCS-180453 6/11/2019 3:12:08 PM Page 5 Mitigated Routing 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:12:08 PM Page 6 ._. Analysis Results POC 1 1 OE-5 t0E 4 70E.3 10E.2 t0E•1 'I 10 100 F t Time C----- ng + Predeveloped Predeveloped Landuse Totals for POC #1 Total Pervious Area: 0.42 Total Impervious Area: 0 Mitigated Landuse Totals for POC #1 Total Pervious Area: 0.42 Total Impervious Area: 0 I" •jjfj' � - Gumule6ve Probability - - — I � LL � x sH ;awl j ,5 I x Mitigated Flow Frequency Method: Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.007127 5 year 0.011061 10 year 0.013195 25 year 0.015365 50 year 0.016654 100 year 0.017714 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.015934 5 year 0.032125 10 year 0.048907 25 year 0.079875 50 year 0.112298 100 year 0.155071 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1902 0.010 0.013 1903 0.003 0.008 1904 0.006 0.050 1905 0.004 0.010 1906 0.002 0.006 1907 0.011 0.023 1908 0.007 0.011 1909 0.008 0.012 1910 0.012 0.029 1911 0.006 0.016 c eml 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:12:08 PM Page 7 1912 0.022 0.125 1913 0.011 0.015 1914 0.002 0.124 1915 0.004 0.008 1916 0.006 0.012 1917 0.003 0.006 1918 0.007 0.011 1919 0.005 0.009 1920 0.007 0.018 1921 0.007 0.012 1922 0.008 0.024 1923 0.005 0.014 1924 0.003 0.008 1925 0.003 0.008 1926 0.006 0.013 1927 0.008 0.012 1928 0.005 0.011 1929 0.011 0.024 1930 0.007 0.013 1931 0.007 0.011 1932 0.005 0.012 1933 0.006 0.014 1934 0.016 0.062 1935 0.006 0.009 1936 0.009 0.015 1937 0.008 0.037 1938 0.008 0.010 1939 0.000 0.007 1940 0.006 0.019 1941 0.006 0.011 1942 0.009 0.030 1943 0.003 0.016 1944 0.008 0.052 1945 0.007 0.013 1946 0.006 0.019 1947 0.004 0.009 1948 0.015 0.024 1949 0.012 0.025 1950 0.006 0.012 1951 0.008 0.013 1952 0.021 0.100 1953 0.019 0.080 1954 0.006 0.014 1955 0.005 0.008 1956 0.003 0.008 1957 0.008 0.012 1958 0.020 0.043 1959 0.012 0.030 1960 0.004 0.008 1961 0.012 0.086 1962 0.006 0.013 1963 0.003 0.008 1964 0.006 0.109 1965 0.014 0.040 1966 0.003 0.008 1967 0.006 0.032 1968 0.008 0.014 1969 0.005 0.011 19-03-13-WWHM20'12-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 8 .A 1970 0.008 0.028 1971 0.015 0.028 1972 0.010 0.225 1973 0.011 0.025 1974 0.006 0.026 1975 0.016 0.073 1976 0.007 0.046 1977 0.005 0.008 1978 0.014 0.035 1979 0.004 0.018 1980 0.007 0.027 1981 0.007 0.015 1982 0.005 0.010 1983 0.011 0.022 1984 0.003 0.017 1985 0.007 0.038 1986 0.005 0.011 1987 0.012 0.034 1988 0.009 0.012 1989 0.007 0.012 1990 0.009 0.014 1991 0.006 0.021 1992 0.010 0.022 1993 0.008 0.014 1994 0.015 0.020 1995 0.003 0.007 1996 0.016 0.026 1997 0.008 0.012 1998 0.007 0.020 1999 0.000 0.003 2000 0.005 0.017 2001 0.004 0.008 2002 0.010 0.078 2003 0.008 0.015 2004 0.008 0.017 2005 0.010 0.063 2006 0.005 0.009 2007 0.006 0.021 2008 0.007 0.012 2009 0.005 0.008 2010 0.004 0.012 2011 0.005 0.007 2012 0.006 0.018 2013 0.005 0.017 2014 0.004 0.008 2015 0.014 0.128 2016 0.002 0.006 2017 0.012 0.019 2018 0.020 0.046 2019 0.022 0.075 2020 0.006 0.036 2021 0.010 0.024 2022 0.003 0.030 2023 0.008 0.020 2024 0.017 0.126 2025 0.006 0.011 2026 0.011 0.019 2027 0.005 0.014 19-03-13-VWVHM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 9 2028 0.002 0.007 2029 0.008 0.012 2030 0.015 0.029 2031 0.004 0.008 2032 0.003 0.007 2033 0.004 0.007 2034 0.004 0.010 2035 0.017 0.030 2036 0.009 0.019 2037 0.002 0.007 2038 0.009 0.031 2039 0.001 0.005 2040 0.003 0.011 2041 0.005 0.012 2042 0.018 0.040 2043 0.008 0.023 2044 0.011 0.018 2045 0.007 0.013 2046 0.008 0.013 2047 0.005 0.010 2048 0.007 0.013 2049 0.006 0.015 2050 0.004 0.010 2051 0.007 0.038 2052 0.004 0.011 2053 0.007 0.014 2054 0.010 0.090 2055 0.003 0.007 2056 0.003 0.010 2057 0.005 0.010 2058 0.006 0.010 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predevelloped Mitigated 1 0.0216 0.2250 2 0.0215 0.1277 3 0.0209 0.1258 4 0.0198 0.1247 5 0.0195 0.1241 6 0.0185 0.1089 7 0.0180 0.1001 8 0.0173 0.0903 9 0.0167 0.0863 10 0.0163 0.0802 11 0.0162 0.0780 12 0.0157 0.0749 13 0.0154 0.0726 14 0.0153 0.0630 15 0.0146 0.0617 16 0.0145 0.0522 17 0.0144 0.0503 18 0.0141 0.0462 19 0.0141 0.0461 20 0.0122 0.0430 21 0.0121 0.0401 22 0.0120 0.0399 23 0.0119 0.0383 19-03-13-MMM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 10 J 24 0.0116 0.0381 25 0.0115 0.0367 26 0.0115 0.0363 27 0.0114 0.0347 28 0.0113 0.0338 29 0.0111 0.0317 30 0.0110 0.0312 31 0.0109 0.0305 32 0.0107 0.0298 33 0.0100 0.0297 34 0.0100 0.0297 35 0.0099 0.0293 36 0.0099 0.0292 37 0.0098 0.0285 38 0.0096 0.0277 39 0.0096 0.0268 40 0.0093 0.0262 41 0.0093 0.0258 42 0.0090 0.0247 43 0.0089 0.0245 44 0.0087 0.0245 45 0.0086 0.0243 46 0.0083 0.0239 47 0.0082 0.0236 48 0.0081 0.0235 49 0.0081 0.0227 50 0.0080 0.0223 51 0.0080 0.0221 52 0.0079 0.0208 53 0.0079 0.0205 54 0.0078 0.0203 55 0.0078 0.0200 56 0.0078 0.0196 57 0.0077 0.0194 58 0.0077 0.0189 59 0.0077 0.0188 60 0.0076 0.0188 61 0.0076 0.0187 62 0.0075 0.0185 63 0.0075 0.0185 64 0.0073 0.0177 65 0.0073 0.0175 66 0.0072 0.0175 67 0.0072 0.0173 68 0.0071 0.0167 69 0.0071 0.0166 70 0.0070 0.0162 71 0.0069 0.0160 72 0.0069 0.0154 73 0.0069 0.0153 74 0.0069 0.0149 75 0.0068 0.0146 76 0.0068 0.0146 77 0.0068 0.0142 78 0.0067 0.0141 79 0.0067 0.0141 80 0.0066 0.0140 81 0.0065 0.0139 19-03-13-WWNM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 11 82 0.0065 0.0138 83 0.0065 0.0136 84 0.0065 0.0136 85 0.0064 0.0134 86 0.0064 0.0133 87 0.0064 0.0131 88 0.0063 0.0130 89 0.0063 0.0130 90 0.0063 0.0129 91 0.0063 0.0128 92 0.0062 0.0126 93 0.0062 0.0126 94 0.0062 0.0125 95 0.0061 0.0124 96 0.0059 0.0124 97 0.0058 0.0123 98 0.0058 0.0122 99 0.0058 0.0121 100 0.0057 0.0120 101 0.0056 0.0120 102 0.0056 0.0118 103 0.0056 0.0117 104 0.0054 0.0116 105 0.0054 0.0116 106 0.0053 0.0115 107 0.0053 0.0115 108 0.0051 0.0114 109 0.0051 0.0112 110 0.0051 0.0109 111 0.0051 0.0108 112 0.0051 0.0108 113 0.0050 0.0108 114 0.0050 0.0108 115 0.0048 0.0107 116 0.0048 0.0106 117 0.0048 0.0105 118 0.0047 0.0104 119 0.0046 0.0103 120 0.0046 0.0100 121 0.0045 0.0100 122 0.0044 0.0099 123 0.0043 0.0099 124 0.0043 0.0097 125 0.0043 0.0096 126 0.0042 0.0096 127 0.0041 0.0093 128 0.0040 0.0091 129 0.0039 0.0090 130 0.0038 0.0087 131 0.0038 0.0084 132 0.0037 0.0083 133 0.0036 0.0082 134 0.0036 0.0081 135 0.0035 0.0081 136 0.0035 0.0081 137 0.0034 0.0080 138 0.0034 0.0080 139 0.0034 0.0080 19-03-13-WWHM2012-SITE CAL.CS-180453 6/11/2019 3:14:33 PM Page 12 140 0.0034 0.0080 141 0.0033 0.0080 142 0.0032 0.0079 143 0.0031 0.0075 144 0.0030 0.0075 145 0.0030 0.0073 146 0.0029 0.0073 147 0.0028 0.0071 148 0.0028 0.0070 149 0.0026 0.0070 150 0.0025 0.0068 151 0.0024 0.0066 152 0.0020 0.0065 153 0.0017 0.0064 154 0.0016 0.0062 155 0.0008 0.0056 156 0.0005 0.0046 157 0.0004 0.0031 i 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 13 ►.rl Duration Flows Flow(cfs) Predev mit Percentage Pass/Fail 0.0036 53289 213980 401 Fail 0.0037 49017 199502 407 Fail 0.0038 45158 186015 411 Fail 0.0040 41756 173573 415 Fail 0.0041 38645 162123 419 Fail 0.0042 35816 151498 422 Fail 0.0044 33239 141589 425 Fail 0.0045 30911 132341 428 Fail 0.0046 28863 123918 429 Fail 0.0048 26936 115881 430 Fail 0.0049 25174 108504 431 Fail 0.0050 23424 101623 433 Fail 0.0052 21866 95347 436 Fail 0.0053 20330 89457 440 Fail 0.0054 18921 83952 443 Fail 0.0055 17671 78887 446 Fail 0.0057 16493 74098 449 Fail 0.0058 15458 69749 451 Fail 0.0059 14451 65675 454 Fail 0.0061 13498 61876 458 Fail 0.0062 12590 58353 463 Fail 0.0063 11792 55012 466 Fail 0.0065 11060 51879 469 Fail 0.0066 10416 48945 469 Fail 0.0067 9837 46270 470 Fail 0.0069 9309 43737 469 Fail 0.0070 8781 41365 471 Fail 0.0071 8291 39185 472 Fail 0.0073 7850 37087 472 Fail 0.0074 7393 35166 475 Fail 0.0075 7035 33415 474 Fail 0.0077 6667 31720 475 Fail 0.0078 6342 30112 474 Fail 0.0079 6034 28615 474 Fail 0.0081 5742 27244 474 Fail 0.0082 5474 25912 473 Fail 0.0083 5219 24624 471 Fail 0.0085 4988 23352 468 Fail 0.0086 4755 22196 466 Fail 0.0087 4537 21084 464 Fail 0.0089 4334 20066 462 Fail 0.0090 4124 19102 463 Fail 0.0091 3937 18205 462 Fail 0.0092 3771 17346 459 Fail 0.0094 3631 16532 455 Fail 0.0095 3491 15777 451 Fail 0.0096 3368 15073 447 Fail 0.0098 3255 14374 441 Fail 0.0099 3145 13702 435 Fail 0.0100 3055 13091 428 Fail 0.0102 2966 12524 422 Fail 0.0103 2878 11995 416 Fail 0.0104 2782 11461 411 Fail 0.0106 2681 10955 408 Fail 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 14 0.0107 2589 10520 406 Fail 0.0108 2498 10041 401 Fail 0.0110 2393 9595 400 Fail 0.0111 2278 9160 402 Fail 0.0112 2182 8736 400 Fail 0.0114 2081 8335 400 Fail 0.0115 2002 7988 399 Fail 0.0116 1936 7641 394 Fail 0.0118 1866 7311 391 Fail 0.0119 1790 7019 392 Fail 0.0120 1720 6744 392 Fail 0.0122 1666 6490 389 Fail 0.0123 1595 6210 389 Fail 0.0124 1538 5989 389 Fail 0.0126 1483 5758 388 Fail 0.0127 1420 5577 392 Fail 0.0128 1363 5393 395 Fail 0.0130 1298 5215 401 Fail 0.0131 1243 5052 406 Fail 0.0132 1188 4899 412 Fail 0.0133 1147 4754 414 Fail 0.0135 1100 4601 418 Fail 0.0136 1045 4449 425 Fail 0.0137 1000 4313 431 Fail 0.0139 957 4187 437 Fail 0.0140 917 4043 440 Fail 0.0141 877 3905 445 Fail 0.0143 832 3794 456 Fail 0.0144 789 3696 468 Fail 0.0145 755 3602 477 Fail 0.0147 710 3497 492 Fail 0.0148 666 3399 510 Fail 0.0149 627 3300 526 Fail 0.0151 595 3183 534 Fail 0.0152 555 3098 558 Fail 0.0153 516 3012 583 Fail 0.0155 462 2933 634 Fail 0.0156 423 2844 672 Fail 0.0157 394 2759 700 Fail 0.0159 360 2675 743 Fail 0.0160 335 2591 773 Fail 0.0161 306 2504 818 Fail 0.0163 286 2421 846 Fail 0.0164 265 2342 883 Fail 0.0165 247 2249 910 Fail 0.0167 233 2171 931 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. 19-03-13-WWHM2012•-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 15 Water Quality 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. 19-03-13-WUVI-MM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 16 _a LID Report wl M 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 UD Duration Standard 8% of 2 yrto 50% of Analysis 2 >? Result = Failed 19-03-13-WWI-IM2012-SITE CALCS-180453 6/11/2019 3:14:33 PM Page 17 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 19-03-13-VVWHM2012-SITE CALCS-180453 6/11/2019 3:16:17 PM Page 18 _J Appendix Predeveloped Schematic 19-•03-13ANWHM2012-SI i E CALCS--180453 6/11/2019 3:16:17 PM Page 19 ..J Mitigated Schematic 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:16:17 PM Page 20 Predeveloped UC/ File RUN GLOBAL WWHM4 model simulation START 1901 10 01 END 2058 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <----------- File Name ------------------------------ >*** <-ID-> *** WDM 26 19-03-13-WWHM2012-SITE CALCS-180453.wdm MESSU 25 Prel9-03-13-WWHM2012-SITE CALCS-180453.MES 27 Prel9-03-13-WWHM2012-SITE CALCS-180453.L61 28 Prel9-03-13-WWHM2012-SITE CALCS-180453.L62 30 POC19-03-13-WWHM2012-SITE CALCS-1804531.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<---------- Title ----------- >***TRAM PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><------- Name ------- >NBLKS Unit -systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT -INFO <PLS > ***************** Print -flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT -INFO 19-03-13-WWNM2012-SITE CALCS-180453 6/11/2019 3:16:18 PM Page 21 ..1 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATEI <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 END PWAT-STATEI END PERLND IMPLND GEN-INFO <PLS ><------- Name ------- > Unit -systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT -INFO <ILS > ******** Print -flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT -INFO TWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 TWAT-STATEl <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END TWAT-STATEI w 19-03-13-kNWHN12012-SITE CALCS-180453 6/11/2019 3:16:18 PM Page 22 _-A END IMPLND SCHEMATIC <-Source-> <Name> # Basin 1*** PERLND 11 PERLND 11 ******Routing****** END SCHEMATIC <--Area--> <-Target-> MBLK <-factor-> <Name> # Tbl# 0.42 COPY 501 12 0.42 COPY 501 13 NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------ >< --- > User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT -INFO <PLS > ***************** Print -flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT -INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC Al A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------ ><-------- ><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><-------- > <---><---><---><---><---> <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC -ACTIONS END SPEC -ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 DIV PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 DIV IMPLND 1 999 EXTNL PREC 19-03-,f3-VWVI-IM2012-SITE CALCS-180453 6111/2019 3:16:18 PM Page 23 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS -LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS -LINK 12 PERLND PWATER SURD 0.083333 COPY INPUT MEAN END MASS -LINK 12 MASS -LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS -LINK 13 END MASS -LINK END RUN 19-03-13-WWHM2012-SITE CAL.CS-180453 6/11/2019 3:16:18 PM Page 24 ME PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS V Z VNN VIFW VIRC VLE INFC HWT *** 17 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY 17 0 4.5 0.03 400 0.1 0.5 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR 17 0 0 2 2 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 # - # CEPSC UZSN NSUR INTFW IRC 17 0.1 0.25 0.25 6 0.5 END PWAT-PARM4 AGWRC 0.996 BASETP AGWETP 0 0 *** LZETP *** 0.25 PWAT-STATEI <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS 17 0 0 0 0 2.5 1 END PWAT-STATEI END PERLND IMPLND GEN-INFO <PLS ><------- Name ------- > END GEN-INFO *** Section IWATER*** Unit -systems Printer *** User t-series Engl Metr *** in out *** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT -INFO <ILS > ******** Print -flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT -INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END TWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATEI <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATEI GWVS 0 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:16:18 PM Page 26 END IMPLND SCHEMATIC <-Source-> <Name> # Basin 1*** PERLND 17 PERLND 17 r ******Routing****** END SCHEMATIC <--Area--> <-Target-> MBLK <-factor-> <Name> # Tbl# 0.42 COPY 501 12 0.42 COPY 501 13 NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------ >< --- > User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT -INFO <PLS > ***************** Print -flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT -INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC Al A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------ ><-------- ><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <----_-><-------- > <---><---><-_-><---><___> END HYDR-INIT END RCHRES SPEC -ACTIONS END SPEC -ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 DIV PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 DIV IMPLND 1 999 EXTNL PREC 19-03-13-W\NHM2012-SITE_ CALCS-180453 6/11/2019 3:16:18 PM Page 27 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS -LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS -LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS -LINK 12 MASS -LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS -LINK 13 END MASS -LINK END RUN 19-03-13-VUWE-IM2012-SITE= CALCS-180453 6/11/2019 3:16:18 PM Page 28 Predeveloped HSPF Message File 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:16:18 PM Page 29 Mitigated HSPF Message File . ■ 19-03-13-WWHM2012-SITE CALCS-180453 6/11/2019 3:16:18 PM Page 30 ua Disclaimer -J Legal Notice This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by: Clear Creek Solutions, Inc. 2005-2019; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 19-03-13-WWHM2012-SITE CALCS-1804.53 6/11/2019 3:16:18 PM Page 31 SECTION Iv OPERATION AND MAINTENANCE STANDARDS Maintenance and operation of the storm water facilities is the responsibility of the property owner. Maintenance of storm water facilities are perhaps the single most important factor in assuring satisfactory long term performance of the system. It follows that the lack of proper maintenance is the single most important factor which causes unsatisfactory performance and in some cases system failure. It is therefore essential that regular maintenance and cleaning of the system be an integral part of site operations. A good maintenance program will prolong the useful life of the system and reduce the likelihood of problems occurring as the system ages. SECTION V Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 47' 49 ON 47' 49 Y N Custom Soil Resource Report 3 Soil Map d N N 54TiO3 547717 547725 547733 547741 547749 547757 547765 547773 547781 3 3 Map Scale: 1:363 if printed on A landscape (11" x 8.5") sheet N N Meters 0 5 10 20 30 Feet 0 15 30 60 0-0Map projection: Web Mercator Comer coordinates: WG'S84 Edge tics: UTM Zone 1ON WGS84 P 470 49 6' N I 0 I 47o 49 5' N Area of Interest (AOI) - - Area of Interest (AOI) Soils Soil Map Unit Polygons ,s Soil Map Unit Lines Soil Map Unit Points Special Point Features ra "") Blowout 3"1 Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip 0o Sodic Spot Custom Soil Resource Report Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation j. Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 10 The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Snohomish County Area, Washington Survey Area Data: Version 19, Mar 29, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 7, 2014—Jul 8, 2014 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 6 Alderwood-Urban land complex, 0.5 100.0% 8 to 15 percent slopes Totals for Area of Interest 0.6 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. 11 Custom Soil Resource Report An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Snohomish County Area, Washington 6—Aiderwood-Urban land complex, 8 to 16 percent slopes Map Unit Setting National map unit symbol. 2hzn Elevation: 50 to 800 feet Mean annual precipitation: 25 to 60 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 180 to 220 days Farmland classification: Not prime farmland Map Unit Composition Alderwood and similar soils: 60 percent Urban land: 25 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting Landform: Till plains Parent material. Basal till Typical profile H1 - 0 to 7 inches: gravelly ashy sandy loam H2 - 7 to 35 inches: very gravelly ashy sandy loam H3 - 35 to 60 inches: gravelly sandy loam Properties and qualities Slope: 8 to 15 percent Depth to restrictive feature: 20 to 40 inches to densic material Natural drainage class: Moderately well drained Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.06 in/hr) Depth to water table: About 18 to 36 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4s Hydrologic Soil Group: B Forage suitability group: Limited Depth Soils (G002XN302WA) Hyddc soil rating: No Minor Components Norma, undrained Percent of map unit. 5 percent Landform: Drainageways Hydric soil rating: Yes 13 MAC JOB SITE ADDRESS.• SuPL FIELD i0G l 0 G VP,4 P i C. AVE-, F- h fl oto WEATHER.- C, 5,qg �62D DATE.• V/ /zo/ Compost and Topsoil Calculation Worksheet for the Pre -approved Amendment Rate NOTE: For Options 2 and 3, use this worksheet if you plan to use the pre -approved compost amendment rate of 2 inches. This worksheet should not be used if a custom compost amendment rate is selected for Options 2 and/or 3. ®ption 1 Option 2 Leave native soil undisturbed, and protect from compaction during construction. • Enter lettered areas from site plan where this option will be used: No calculations for compost or topsoil are necessary for this option. Amend existing soil in -place (2-inch layer of compost). • Enter lettered areas from site plan where this option will be used: Enter combined square footage of lettered areas in thousands — (example: for 4,525 sq ft, enter 4.525; for 500 sq ft, enter 0.5) • Multiply combined square footage by 6.2 and enter product in box A : A V� =Cubic `lards AMOUNT OF COMPOST NEEDED FOR THESE AREAS Note: MR 5 is triggered on sites with more than 2,000 sq. ft. of new, replaced, or new plus replaced impervious surface, or 7,000 sq. ft. or greater of land disturbing activity. Effective September 30, 2010 S. �CSCIDocument Warehouse�FORMSjCurrent Farms compost and Topsoil Calculation Worksheet 9 13 10.docx Option 3 Option 4 Native Soil — stockpile site duff and topsoil and reapply after grading and construction. • Enter lettered areas from site plan where this option will be used: • Enter combined square footage of lettered areas in thousands (example: for 4,525 sq ft, enter 4.525; for 500 sq ft, enter 0.5) • Multiply combined square footage by 25 and enter product in box B : ,fv A =Cubic Yards AMOUNT OF TOPSOIL TO BE STOCKPILED AND REAPPLIED IN THESE AREAS Import topsoil. • Enter lettered areas from site plan where this option will be used: • Enter combined square footage of lettered areas in thousands (example: for 4,525 sq ft, enter 4.525; for 500 sq ft, enter 0.5) • Multiply combined square footage by 25 and enter product in box C: (� 3 =Cubic Yards AMOUNT OF IMPORTED TOPSOITHESE NEEDED FOR THESE AREAS Order These Amounts: • Enter amount in Box A: • Enter amount in Box C yr Cubic Yards of Compost Cubic Yards of Topsoil Nome: MR 5 is triggered on sites with more than 2,000 sq. ft. of new, replaced, or new plus replaced impervious surface, or 7,000 sq. ft. or greater of land disturbing activity. Effective September 30, 2010 S: jCSC�Document WarehousekFORMSICurrent Forrns�Compost and Topsoil Calculation Worksheet 9 13 10.docx APPENDIX GRAPHIC SCALE 30 0 15 30 c IN FEET) 1 INCH = JO FT y 14 REBAR/CAP "U.S. WEBB PLS 162J0" NW CORNER OF DILAPIDATED WOOD FENCE 0.4S OF 37.67' l y 1 f�f 4W ' �A_ L-- -I--•- --1A' fWEBB LS CAP �' l \ I 1 1 % ---- ' --- I h 16130" 0.05'S & 0.04'W OF LOT CORNER SET BY '�� I \ I i I EX (18R) of I o REFERENCE R2 (REF 4) I IE1=164.15 14 REBAR/CAP 'WEBS LS 162J0" 0.14'S OF LOT CORNER — SET BY REFERENCE R2 SW CORNER OF W z DILAPIDATED WOOD O.JW & 0.4E OF \ ` I ElMAILBOXX LOT CORNER (REF 5) Spo"II � I _Y�a '"`AND5 EDGE PASEN7PR A1Oq4 REBAR/CAP BB 6 'U.S. PLS i0a _.......... � it i REBAR/CAP (REF 2) 14 REBAR/CAP W..S WEBB PLS 162JO" 0.07'S & 0.08'W OF LOT CORNER SW CORNER OF DILAPIDATED WOOD FENCE 0.I'S & 0.I'E OF LOT CORNER (REF 3) .r'.�L�tlSttr�su�lt;vrzo:3 I CONTRACTOR TO CWWCT Ex SS STUB TO PROM SFR AS M1Rr1ED R4 SEAR NOMS 15 REBAR/GAP "RMA LS 4561" AT LOT a CORNER - SET BY REFERENCE R3 (REF 1) N893428"W 194.00 \ 1 a-C PO Bog 177 Silvana, WA. 98287 Tel. 360-652-5820 EmTMaIlNo macengineering@frouflerrocom Looking west from Olympic Ave at location of existing driveway to be removed Looking north along Olympic Ave near location of existing driveway to be removed FIGURE 2 e SITE ; PHOOGIRAOIRS IPage of3 Looking south along Olympic Ave near location of existing driveway to be removed x Looking northwest at location of proposed develop rnen-L FIGURE- 2: SITE PHOTOGIRAPRIS Page 2- of 3 Looking northwest at existing -fence on southern property line Looking northeast at existing fence on western property line FIGURE 2: SITE PHOTOGRAPHS Wage 3 of 3 GRAPHIC SCALE 40 0 115 jo IN FEET 1INCH = 30 FT CONTRACTOR TO CONNECT D( SS SIM TO Avaom SfR AS UWTM IN AMENDED SOIL AREA 'A' SENfR NOTES IZ120 SEE' NOT 7 (TYP) 15 REBARICAp �4 REBARICAP 'RAM LS 4561" AT LOT CORNER - SET By "U.S. 14F88 PLS 16230" REFERENCE Ri (REF i) J7.67' NW CORNER OF DILAPIDATED WOOD N89 *�4'28"W 194.0071'"l' FENCE 0. 4S OF REBARICAP (REF 2) PR r op ri A (MAX' 14) 9IJ4, w -ROME., Vb� ?C We PK. '60 i J4 REBARICAP 16.96' :EVW ANDI "A S. WEBB PLS 16230" D07'S & 0.08'W OF LOT PROPOSER Rs' CORNER SIV CORNER OF DILAPIDATED MOOD FLOWfnp) FENCE 0. I'S & 0. IE OF LOT CORNER (REF J) LLJ 14 REBARICAP "WEBB LS 16230" 0.0 55& 004W OF LOT CORNER SET BY REFERENCE R2 (REF zt ' lzt� / 71� 4) PROpasm 14 REBARICAP LAW ,'V'88 LS 16230" 0. WS OF LOT CORNER - SET BY REFERENCE P7 SW CORNER OF DILAPIDATED MOOD O.JW & 04E Of EhMlt6OA'—j,' LOT CORNER (REF 5) 'kl--STANUN89*4454"W 179.12' ama PA VEWEAT P%NVA�E ROAff,� '7 f4 REBARICAP ��I Proo as 16 O'll 41 _• ti f� ,r r� 1j e r; ? ;-d i 1 � df " D WNSTREAM FLU SITE HICKS CHILDREN'S TRUST OFF --SITE BASIN MAP I EDMONDS STORMWATER ADDENDUM JUNE 2017 Does the project result in 2,000 square feet, or greater, of new plus replaced hard surface area? OR Does the land disturbing activity total 7,000 square feet or greater? i Yes No Minimum Requirements No. 1 through 5 apply I Minimum Requirement No. 2 applies Next Question Does the project add 5,000 square feet or more of new plus replaced hard surfaces? OR Convert 0.75 acres or more of vegetation to lawn or landscaped areas? OR Convert 2.5 acres or more of native vegetation to pasture? N41 1v r— Is this a road related project? Yes All Minimum Requirements apply to the new and replaced hard surfaces and converted vegetation areas. All Minimum Requirements apply to the new hard surfaces and converted vegetation areas. Yes Does the project add 5,000 square feet or more of new hard surfaces? Yes No No Do new hard surfaces add 50% or more to the existing hard surfaces within the project linuts? No Figure 3.1. Flow Chart for Determining Requirements for Development. 8 3. APPLICABILITY OF THE MINIMUM REQUIREMENTS No additional requirements. r'6 5 GRAPHIC SCALE 30 0 15 30 ( IN FEET) i INCH = 30 FT 14 REBAR/CAP "M.S. WEBB PLS 16230" NW CORNER OF DILAPIDATED WOOD FENCE 0.4S OF REBAR/CAP (REF 2) • 2 '89 34' #4 REBAR/CAP 16.9 M.S WEBB PLS 15230" 0.07'S & 0.08'W OF LOT CORNER SW CORNER OF DILAPIDATED WOOD FENCE 0.I'S & 0.1'E OF LOT CORNER (REF 3) f4 REBA(i/CAP WEBS L 16230" 0.055 & 0.04'W OF LOT CORNER SET BY CONTRACTOR TO GOMECT EX SS STUB TO PROPOSED SFR AS x1El/TIREB W I SEW NOTES J5 REBAR/CAP 'RMA LS 4561" AT LOT CORNER - SET BY I as i�� I7O.00' REFERENCE R3 (REF 1) � � N89428"W 194.00' 2l'WI r I SO)BORhIG LO>hA LION / I EA ASPHAiL T oA� REFERENCE R2 (REF 4) I� I v't)tis} i( 37.67' —' U � I _-j ' U R 1 14 REBAR/CAP "WEBB LS 16230" 0.14'S OF LOT CORNER - SET BY REFERENCE R2 SVI CORNER OF DILAPIDATED WOOD 03N & 0.4'£ OF60 LOT CORNER (REF 5) ,( Ifr+t.� \ / I --- + ---- M STAND u 4� ` 1 , N89W 179.12' \ \ '44 54 Lu z 1 _� -EX :.0 r ( THICKENED EOCE - _.___I PA�AIENT PR WA E RU* a tiai j y4 REBAR/CAP -_ _........L,_..._ ..._ _..._... ._....__ . _..� I I I "M.S. WEBB PLS ib 0" I I 10054c I�'054f. I t 0J A