Appendix A Stormwater Site Plan Report Short Form

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1 Appendix A Stormwater Site Plan Report Short Form The Stormwater Site Plan Report Short Form may be used for projects that trigger only Minimum Requirements #1-#5. These projects typically fall within or below the following thresholds: The project adds or replaces between 2,000 and 5,000 square feet of hard surface. The project disturbs between 7,000 square feet and 1 acre of land. If the project quantities exceed any of the above thresholds, prepare a formal Stormwater Site Plan Report per Volume 1, Chapter 4 of the City of Tacoma Stormwater Management Manual. Environmental Services may also require additional information if warranted by project parameters. Chapter 1 Project Overview Work Order/Building Permit Number(s): Associated City of Tacoma Permit Number(s) (e.g. land use permits, work order permits): Applicant Name: Applicant Address: Applicant Phone Number: Applicant Property Owner: Property Owner Address: Property Owner Phone Number: Property Owner Project Address: Parcel Number: Size of Parcel (acres or square feet): Identify other agency permits required or associated with the subject parcel (e.g. hydraulic permits, Army Corps 404 permits). Provide Permit numbers if available: Watershed: Brief description of the project to include the following: Current site condition and/or use: Appendix A 1-69 Volume 1

2 City of Tacoma Proposed site condition and/or use: Have any other site improvements (include all new impervious surfaces and areas cleared) occurred on the site after January 1, 2003? List square footages and description: Project impacts. Please fill in the following table (include onsite and offsite): Table 1-4: Project Threshold Worksheet Description a Onsite Offsite Total Existing Conditions Total Project Area b (ft²) Existing hard surface (ft²) Existing vegetation area (ft²) Existing Conditions Total Project Area b (ft²) Amount of new hard surface (ft²) Amount of new pollution generating hard surface (PGHS) c (ft²) Amount of replaced hard surface (ft²) Amount of replaced PGHS d (ft²) Amount of new plus replaced hard surface (ft²) Amount of new + replaced PGHS (ft²) Amount of existing hard surfaces converted to vegetation (ft²) Amount of Land Disturbed (ft²) Vegetation to Lawn/Landscaped (acres) Native Vegetation to Pasture (acres) Existing hard surface to remain unaltered (ft²) Existing vegetation area to remain (ft²) a.all terms are defined in the SWMM glossary. b.the total project area in the existing condition should typically match the total project area in the proposed condition. c.the amount of new PGHS should be part of or all of amount of new hard surfaces. d.the amount of replaced PGHS should be part of or all of amount of replaced hard surfaces Volume Appendix A

3 Chapter 2 Existing Condition Summary Existing Site Conditions (Check all that apply) 1. Describe the existing site conditions. (Check all that apply) Forest Pasture/prairie grass Pavement Landscaping Brush Trees Other 2. Describe how surface water (stormwater) drainage flows across/from the site. (Check all that apply) Sheet Flow Gutter Catch Basin Ditch/Swale Storm sewer pipes Stream/Creek Other 3. Describe, discuss and identify the following for the project site: a. Topography is the site: Flat Rolling Steep b. Natural and man-made drainage patterns (which direction does stormwater flow and how): c. Are there any known historical drainage problems such as flooding, erosion, etc. d. Existing utilities (Check all that are on the site and show on site map with legend) Storm Water Sewer Other e. Are sensitive and critical areas present on or near the site (i.e. vegetative buffers, wetlands, steep slopes, floodplains, geologic hazard areas, streams, creeks, ponds, ravines, springs, etc.)? Yes (show on site map) No f. Are existing fuel tanks present on the site? Yes (show on site map) No g. Is this site within the South Tacoma Groundwater Protection District (on GovME or SWMM Volume 1, Chapter 2, Figure 1-2)? Yes No Appendix A 1-71 Volume 1

4 City of Tacoma h. Is the site within the aquifer recharge area (on GovME under Building and Land Use/ Critical Areas)? Yes No i. Are groundwater wells present onsite and/or within 100 feet of the site? Yes (show on site map) No j. Are septic systems present onsite and/or within 100 feet of the site? Yes (show on site map) No k. Are there existing public and/or private easements on the project site? Yes (show on site map & provide recording numbers) No 4. Provide a soils report to identify the following (attach soils report as Appendix to Stormwater Site Plan): a. Date of soil investigation: b. Soil type and/or infiltration rate: NOTE: See Volume 3, Appendix B to determine when soils report is needed for a project. c. Groundwater elevation: d. Location of test pits (show on site map). e. Attach the soils report (with soil log) to this document. Adjacent Areas 1. Check any adjacent areas that may be affected by site disturbance and describe in item 2 below (check all that apply): Streams* Lakes* Wetlands* Steep Slopes* Residential Areas Roads Ditches, pipes, culverts Other * If site is on or adjacent to a critical area, the City of Tacoma may require additional information, engineering, and other permits to be submitted with this short-form. 2. Describe how and where surface water enters the site from upstream properties: Describe how and where surface water exits the site: Volume Appendix A

5 Chapter 3 Offsite Analysis (Qualitative) 1. Describe the downstream drainage path leading from the site to the receiving body of water. (Minimum distance of ¼-mile (1320 feet)) {e.g. water flows from site, into curb-line to catch basin at intersection of X and Y streets. A 12-inch pipe system conveys water another 1000 feet to a ravine/wetland.} 2. Investigate the drainage system ¼ mile downstream from the project by site visit, including the following items: a. Problems reported or observed during the site visit: b. Existing/potential constrictions or capacity deficiencies in the drainage system: c. Existing/potential flooding problems: d. Existing/potential overtopping, scouring, bank sloughing, or sedimentation: Appendix A 1-73 Volume 1

6 City of Tacoma e. Qualitative data on features such as land use, hard surface, topography, soils, presence of streams, and wetlands: f. Information on pipe sizes, channel characteristics and drainage structures: g. Date and weather at the time of the inspection (was it raining during site visit?): Chapter 4 Low Impact Development Principles Where feasible, sites shall use the following low impact development site design principles. Check those principles that will be used onsite. The applicant is not required to revise their proposed design in order to accommodate these principles but shall use the principles when feasible. Minimization of land disturbance by fitting development to the natural terrain. Minimization of land disturbance by confining construction to the smallest area feasible and away from critical areas. Preservation of natural vegetation. Locating impervious surfaces over less permeable soils. Clustering Buildings Minimizing Impervious Surfaces Chapter 5 Discussion of Minimum Requirements The following elements are required for the Stormwater Site Plan Report. Describe how each of the Minimum Requirements will be satisfied. The applicant can check the boxes that apply or describe the alternate means used to comply with the Minimum Requirements. Review Volume 1 of the SWMM to determine which Minimum Requirements apply to a project. Minimum Requirement #1 Preparation of a Stormwater Site Plan This stormwater site plan short form report satisfies this requirement. Other Volume Appendix A

7 Minimum Requirement #2 Construction Stormwater Pollution Prevention The Construction Stormwater Pollution Prevention Plan Short Form and TESC Plan Drawing(s) satisfy this requirement. Other: Minimum Requirement #3 Source Control of Pollution For a single family residence, the homeowner shall comply with all Best Management Practices (as applicable) contained in Volume 4, Chapter 3 of the 2016 City of Tacoma Stormwater Management Manual. For commercial or industrial facilities, complete the, Worksheet for Commercial and Industrial Activities contained in Volume 3, Chapter 2 of the 2016 City of Tacoma Stormwater Management Manual. Attach the worksheet to the Stormwater Site Plan Report. The owner or operator shall comply with all BMPs checked. Other: Minimum Requirement #4 Preservation of Natural Drainage Systems and Outfalls All boxes (except Other) should be checked for this Minimum Requirement. The natural drainage patterns have been maintained to the maximum extent feasible. Discharges from the project site occur at the natural location to the maximum extent feasible. Discharge from the project site will not cause a significant adverse impact to downstream receiving waters and downgradient properties. Other: Minimum Requirement #5 Onsite Stormwater Management The following BMPs are proposed for meeting this requirement. See Volume 3 and Volume 6 of the SWMM for feasibility and design requirements for onsite stormwater management techniques. If there are multiple surface types (more than one roof), ensure the means of onsite management is described for each. Roofs: Downspout Infiltration Trench Downspout Dry Well Rain Garden Bioretention Facility Dispersion Trench Splashblocks Perforated Stubout Collect and Convey Other Hard Surfaces: Concentrated Flow Dispersion Permeable Pavement Rain Garden Bioretention Facility Sheet Flow Dispersion Appendix A 1-75 Volume 1

8 City of Tacoma Concentrated Flow Dispersion Collect and Convey Lawn and Landscaped Areas: Post Construction Soil Quality and Depth Other: Minimum Requirement #9 Operation and Maintenance See Chapter 6 of this Stormwater Site Plan Short Form Report. Other: Maintenance Requirement #10 Offsite Analysis and Mitigation See Chapter 3 of this Stormwater Site Plan Short Form Report. Other: NOTE: If Minimum Requirements #6, #7, or, #8 apply to a project this short form cannot be used. Chapter 6 Operation and Maintenance Manual 1. Describe the onsite storm system. Include each type of facility, including its function and operation. Include any manufacturer s documentation. 2. Indicate the person or organization responsible for maintenance of the onsite storm system, including phone number, address and Indicate where the Operation and Maintenance manual is to be kept. Note that it must be made available to the City for inspection. 4. Attach the maintenance schedules from Volume 1, Appendix C for all facilities used on the site, or create maintenance schedules. Volume Appendix A

9 5. Provide a sample maintenance activity log indicating emergency and routine actions to be taken. Attach to this document. 6. Provide an estimated operation and maintenance cost for each component of the proposed system: Chapter 7 Construction Stormwater Pollution Prevention Plan The Construction Stormwater Pollution Prevention Plan Short-Form may be used Please refer to the SWMM Volume 2, Appendix C. Drawings Required Vicinity Map GovME map may be used to provide the nearest cross-streets on the site plan with a North arrow. Site Map showing new and existing improvements and Grading Plan (this may be on a 8 ½ x 11 or 11 x 17 sheet). Include as much detail as possible, including: Elevation contours All existing improvements (including utilities) All proposed improvements Include pipe types and slopes for all proposed stormwater and wastewater lines. Include details for any proposed stormwater system (infiltration trench, rain garden, etc.) If dispersion is proposed show the location of the flowpath and include type of vegetation. Provide a proposed landscape plan. Prepared By: Date Prepared: Appendix A 1-77 Volume 1

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