Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
Reports - Erosion Control - 09/17/2025
AXIS INTERNATIONAL ACADEMY 3939 AUTOMATION WAY EROSION CONTROL REPORT CITY OF FORT COLLINS, COLORADO SEPTEMBER 17, 2025 COLORADO CIVIL GROUP, INC. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. i Table of Contents 1 Introduction .............................................................................................................................................................. 1 1.1 Report Objectives (I.C.1) ................................................................................................................................... 1 1.2 Qualified Stormwater Manager (I.C.2.a.i) ........................................................................................................ 1 2 Spill Prevention and Response (I.C.2.a.ii) ................................................................................................................. 2 3 Materials Handling (I.C.2.a.iii) .................................................................................................................................. 2 4 Potential Sources of Pollution (I.C.2.a.iv) ................................................................................................................. 2 4.1 Disturbed or Stored Soils .................................................................................................................................. 2 4.2 Vehicle Tracking of Sediments.......................................................................................................................... 3 4.3 Management of Contaminated Soils ................................................................................................................ 3 4.4 Loading and Unloading Operations .................................................................................................................. 3 4.5 Outdoor Storage Activities and Bulk Storage of Materials ............................................................................... 3 4.6 Vehicle and Equipment Maintenance and Fueling ........................................................................................... 3 4.7 Significant Dust or Particulate Generating Processes ...................................................................................... 3 4.8 Routine Maintenance Activities ....................................................................................................................... 3 4.9 On-Site Waste Management Practices ............................................................................................................. 4 4.10 Concrete Truck and Equipment Washout ........................................................................................................ 4 4.11 Dedicated Asphalt and Concrete Batch Plants ................................................................................................. 4 4.12 Non-Industrial Waste Sources .......................................................................................................................... 4 4.13 Saw Cutting and Grinding ................................................................................................................................. 4 5 Implementation of Control Measures (I.C.2.a.v) ...................................................................................................... 5 6 Project Description (I.C.2.a.vi) .................................................................................................................................. 5 6.1 Site Location ..................................................................................................................................................... 5 6.2 Nature of Construction Activity (I.C.2.a.vi.a) .................................................................................................... 6 6.3 Installation and Removal Sequence of Control Measures (I.C.2.a.vi.b) ........................................................... 6 6.4 Disturbance Area (I.C.2.a.vi.c) .......................................................................................................................... 7 6.5 Existing Soil Properties (I.C.2.a.vi.d) ................................................................................................................. 7 6.6 Existing Vegetative Ground Cover (I.C.2.a.vi.e) ................................................................................................ 7 6.7 Allowable Non-Stormwater Discharges (I.C.2.a.vi.f) ........................................................................................ 7 6.8 Existing Receiving Waters (I.C.2.a.vi.g) ............................................................................................................. 8 6.9 Existing Stream Crossings (I.C.2.a.vi.h) ............................................................................................................. 8 6.10 Flood Insurance Rate Map (FIRM) .................................................................................................................... 8 7 Site Map (I.C.2.a.vii) .................................................................................................................................................. 8 8 Final Stabilization and Long Term Stormwater Management (I.C.2.a.viii) ............................................................... 8 9 Maintenance and Inspection Reports (I.C.2.a.ix) ..................................................................................................... 8 AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. ii Figures and Tables Figure 6-1: Vicinity Map ................................................................................................................................................ 5 Table 6-1: Anticipated Construction Phases ................................................................................................................. 7 Appendices Appendix A: Stormwater Construction Permit ............................................................................................................. A Appendix B: Control Measure Specifications ............................................................................................................... B Appendix C: Existing Soil & Site Information ................................................................................................................ C Appendix D: Stormwater Inspection Report ................................................................................................................ D Appendix E: Erosion Control Plan and Details .............................................................................................................. E Appendix F: Spill Prevention and Response Plan ......................................................................................................... F AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 1 1 Introduction 1.1 Report Objectives (I.C.1) The objective of this report is to create a Stormwater Management Plan (SWMP) to identify possible pollutant sources to stormwater and, using Control Measures, reduce or eliminate water quality impacts. This report covers each facility in the CDPS General Permit for Stormwater Discharges Associated with Construction Activity (Stormwater Construction Permit). A copy of the Stormwater Construction Permit will be included in Appendix A after issuance. This report identifies all potential pollutant sources which could adversely affect the quality of the discharged stormwater and suggests measures that can be implemented to reduce stormwater pollutants associated with construction activity. All measures described within this report are in accordance with good engineering practices, which include installation, implementation, and maintenance requirements, and must be updated in accordance with Part I.D of the Stormwater Construction Permit, to ensure compliance with the terms and conditions of the permit. Furthermore, any potential pollutant that can reasonably be expected during construction activity through final stabilization must be identified and any possible water quality impacts must be reduced or eliminated by implementing the suggested measures found within this report. 1.2 Qualified Stormwater Manager (I.C.2.a.i) The Qualified Stormwater Manager is responsible for site inspections, and implementing, maintaining, and revising the SWMP. According to the CDPHE Stormwater Management Plan Guidance, the Qualified Stormwater Manager must be “an individual knowledgeable in the principles and practices of erosion and sediment control and pollution prevention, and with the skills to assess conditions at construction sites that could impact stormwater quality and to assess the effectiveness of stormwater controls implemented to meet the requirements of this permit.” The Qualified Stormwater Manager will be assigned by the General Contractor and should be noted below when the contract is awarded: Name: . .. Title: .. Company: . .. Address: .. .. Phone: .. Email: .. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 2 2 Spill Prevention and Response (I.C.2.a.ii) Spill prevention information must be distributed to all contractors and subcontractors working at the construction site. This information, along with response and notification procedures, must be in place prior to construction and must be administered by the site superintendent. Contractors must notify the site superintendent and Qualified Stormwater Manager immediately if any spill occurs. The Qualified Stormwater Manager will determine the nature of the spill and, if necessary, contact the Colorado Department of Public Health and Environment (24-hour spill reporting line – 877-518-5608), downstream water users, and any other agency or jurisdiction deemed necessary. Any chemical, oil, petroleum product, or sewage release that may enter waters of the State of Colorado must be reported. For hazardous material or liquid storage, concrete truck washouts, and fueling and maintenance locations, proper instructions for clean-up procedures should be posted and spill kit locations should be identified. Information on absorbents should also be made available at all liquid storage locations and fueling locations, and proper disposal locations for used absorbents should be provided. 3 Materials Handling (I.C.2.a.iii) Material handling information must be distributed to all contractors and subcontractors working at the construction site. This information, along with response and notification procedures, must be in place prior to construction and must be administered by the site superintendent. 4 Potential Sources of Pollution (I.C.2.a.iv) This section of the SWMP report attempts to identify all pollutant sources expected with the Axis International Academy project. Since it is not possible to know all the construction activities that will occur on-site during the creation of this report, it is critical that the site contractor be aware of all construction activities and their potential to contaminate stormwater either above or below ground, and if needed, initiate controls to prevent contamination. The following sections describe pollutant sources in detail. 4.1 Disturbed or Stored Soils The disturbance areas for the site include demolition to the open space. Once soils have been disturbed, they do not retain the same compaction as in their native state, therefore surface runoff can cause more soil erosion than was historically observed. If any stockpiles are close to drainageways that carry stormwater, silt fence shall be installed to prevent the migration of soils into the stormwater system. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 3 4.2 Vehicle Tracking of Sediments Vehicle tracking of sediments may occur throughout the construction process. The implementation of street sweeping practices and keeping vehicles on paved surfaces, when possible, is critical in reducing pollutants during construction. Vehicle tracking control pads can also reduce the tracking of sediments. 4.3 Management of Contaminated Soils In the event that soils are found to be contaminated on-site, the Qualified Stormwater Manager should be notified. Proper procedures should be followed based on the type and extent of soil contamination. 4.4 Loading and Unloading Operations No loading or unloading operations are anticipated that would introduce contaminants to the stormwater system, therefore no controls are anticipated. 4.5 Outdoor Storage Activities and Bulk Storage of Materials Construction materials may be stored on-site, however, this storage should not produce any contaminants that could be transported. Any liquids that could be transported in a precipitation event should be covered with an impermeable tarp. 4.6 Vehicle and Equipment Maintenance and Fueling As with all construction sites, it is anticipated that equipment maintenance and fueling will occur on-site. These procedures must only be allowed to occur in one place on-site to limit spillage of maintenance and fueling liquids and lubricants. An impermeable tarp that prevents fuel and other liquids from migrating into the soil must cover the fueling area. Proper disposal of contaminated soil must occur after construction is complete and at frequent intervals, if necessary. 4.7 Significant Dust or Particulate Generating Processes Dust or particulate generation is typical in the northern front range of Colorado and can anytime during the year. The use of water for dust control is the most common practice for minimizing particulate generation. Another possible preventative technique would be to minimize vehicular traffic on days with high winds. 4.8 Routine Maintenance Activities Routine maintenance activities include activities that involve fertilizers, pesticides, herbicides, detergents, fuels, solvents, and oils. Other than typical vehicle repair and AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 4 maintenance, which is covered in section 4.6, there are no anticipated maintenance activities that require additional controls. 4.9 On-Site Waste Management Practices Nearly all construction sites must implement some sort of waste management practice and this project is no exception. Portable toilets and construction debris must be located in areas where if spillage occurs, it will not enter the stormwater system. 4.10 Concrete Truck and Equipment Washout Concrete construction is planned for this project, so a designated area for the concrete truck washout is needed. Part I.B.1.a of the Stormwater Construction Permit must be followed in order to allow the conditional discharge of concrete washout water to the ground. Other equipment washing may occur throughout the construction process as well, so this equipment should be washed in the same area as the concrete truck washout. 4.11 Dedicated Asphalt and Concrete Batch Plants Dedicated asphalt and concrete batch plants will not be necessary for construction of the project. The materials will be hauled in for the project on an as needed basis. In the event that a batch plant is needed on-site, it must remain in one location on-site and be a minimum of 100 feet away from any drainageway or storm sewer system. 4.12 Non-Industrial Waste Sources One location should be setup for disposing of liquid and solid wastes generated during the construction process. Containers should be kept closed at all times to prevent waste from blowing off-site during days with high winds. Construction debris can be stored until removed from the site and disposed of properly. 4.13 Saw Cutting and Grinding Saw cutting and surfacing operations generate slurry and process water that contains fine particles and high pH (concrete cutting), both of which can violate the water quality standards in the receiving water. Slurry and cuttings should be vacuumed during cutting. Slurry and cuttings shall not remain on permanent concrete or asphalt overnight. Slurry and cuttings shall not drain to any natural or constructed drainage conveyance including stormwater systems. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 5 5 Implementation of Control Measures (I.C.2.a.v) Stormwater management controls are referred to as Control Measures. The typical duration of use for individual Control Measures can vary depending on the type of Control Measure, the function of the Control Measure, the type of development, and the duration of construction. Construction projects require both temporary and permanent Control Measures to be installed during construction activity and to remain in place after completion of construction. Specifications for both temporary and permanent Control Measures that are to be used as a result of the proposed construction are presented in Appendix B. The implementation phase is provided for each Control Measure in addition to the inspection interval. Anticipated Control Measures to be used have also been identified on the Erosion Control Plan found in Appendix E, however, it is difficult to identify all necessary preventative measures needed to prevent receiving water contamination; therefore, the site contractor must monitor the ongoing construction and install any Control Measure, whether listed in this report or not, necessary to prevent contamination. The Qualified Stormwater Manager should modify the Erosion Control Plans as necessary to document Control Measure installation and maintenance during the life of the project. 6 Project Description (I.C.2.a.vi) 6.1 Site Location The Axis International Academy site (highlighted area in Figure 6-1) is located at 3939 Automation Way; Fort Collins, CO, 80525. The proposed improvements are in the Southeast ¼ of the Northeast ¼ of Section 31, Township 7 North, Range 68 West, 6th Principal Meridian. A vicinity map is presented in Figure 6-1. The property site is approximately 6.38 acres. The property coordinates are 40°32'00.0"N 105°02'33.1"W. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 6 Figure 6-1: Vicinity Map 6.2 Nature of Construction Activity (I.C.2.a.vi.a) The project consists of site improvements to the existing property at 3939 Automation Way. The improvements will consist of a building renovation to convert the existing manufacturing space into a learning facility and the required site development to accommodate the building developments and use case modifications, such as added playground areas, added parking lot, and updated ramps for ADA accessibility. 6.3 Installation and Removal Sequence of Control Measures (I.C.2.a.vi.b) The proposed construction activity anticipated on-site will begin with the installation of erosion control devices along the perimeter of the project area (Phase I). After the erosion control devices are installed, the site will be demolished as necessary to construct site improvements. Phase II consists of site grading, landscaping, and hardscaping improvments. After the proposed improvements are installed, disturbed areas not covered with hardscape will be reseeded and the site will reach final stabilization (Phase III). AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 7 Table 6-1 shows the anticipated construction activities within each phase of site construction. Table 6-1: Anticipated Construction Phases Construction Activity Site Development Phase Control Measures Perimeter Erosion Control Device Installation Phase I Vehicle Tracking Control Pad Stabilized Staging Area Silt Fence Sediment Control Logs Rock Socks Inlet Protection Grading Phase II Concrete Washout Area Final Stabilization Phase III Reseeding 6.4 Disturbance Area (I.C.2.a.vi.c) The Axis International Academy site include improvements located within the City of Fort Collins, within the private property at the address 3939 Automation Way. The total disturbance area is approximately 2.43 acres. 6.5 Existing Soil Properties (I.C.2.a.vi.d) Soil properties described in this section were determined from the Natural Resources Conservation Service (NRCS) website using the Web Soil Survey to compile and present the data, which is provided in Appendix C. Soil Types within the project area are Nunn clay loams, with 0 to 1 and 1 to 3 percent slopes. 6.6 Existing Vegetative Ground Cover (I.C.2.a.vi.e) The project site consists of a parcel with existing an existing building and open space with vegetative cover. The existing vegetative coverage is estimated to be 57%. 6.7 Allowable Non-Stormwater Discharges (I.C.2.a.vi.f) There are several potential non-stormwater discharges associated with construction activities anticipated for the Axis International Academy project. The potential discharges are from the use of a concrete washout, and watering for dust control and compaction. The concrete waste will be contained within the concrete washout area or transported off-site and disposed of. No future major drainageways or regulated floodplains are within the project area. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 8 6.8 Existing Receiving Waters (I.C.2.a.vi.g) The existing parcel sheet flows north to a ditch, ultimately leading to Cache la Poudre River. See stream path from WATERS GeoViewer Print Map by US EPA in Appendix C. 6.9 Existing Stream Crossings (I.C.2.a.vi.h) There are no stream crossings associated with the project. 6.10 Flood Insurance Rate Map (FIRM) This parcel is not within a floodplain nor floodway as indicated on the Flood Insurance Rate Map, Map Number 08069C1000F, effective date December 19, 2006. The FEMA National Flood Hazard Layer FIRMette is presented in Appendix C for reference. 7 Site Map (I.C.2.a.vii) A Site Map and Erosion Control Plan can be found in Appendix E. 8 Final Stabilization and Long Term Stormwater Management (I.C.2.a.viii) Final stabilization is the last step in the construction process and begins after grading and paving activities have ended. The site superintendent should inspect the site one final time to ensure that all temporary and permanent Control Measures will function correctly in a precipitation event. All exposed or bare soil that has not previously been treated must be identified and the appropriate procedure implemented to achieve final stabilization. This includes soil preparation, soil amendments, where necessary, and revegetation. Final stabilization is achieved once all ground disturbing activities have been completed, and all disturbed areas have been paved or reseeded. Ultimate stormwater management is achieved through the use of temporary Control Measures until final site stabilization is achieved and the continued maintenance and operation of the permanent Control Measures installed on-site. An exhibit showing final site stabilization surfaces is provided in Appendix E. 9 Maintenance and Inspection Reports (I.C.2.a.ix) Inspection reports should be prepared by a Qualified Stormwater Manager. Standard construction site inspection and maintenance schedules are identified in the Control Measures specifications in Appendix B for each of the anticipated Control Measures to be installed on- site. Part I.D.2 of the Stormwater Construction Permit requires that a thorough inspection of the stormwater management system be performed and documented at least every 7 days or every 14 days and within 24 hours following any precipitation or snowmelt event that causes surface erosion. A copy of the Construction Stormwater Site Inspection Report can be found in Appendix D. More frequent inspections may be necessary and should be performed at the AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 9 request of the Qualified Stormwater Manager. This report can be modified to provide any additional pollution controls or meet increased inspection needs, if deemed necessary. Standard site inspection procedures that must be followed by the site superintendent are as follows: • The perimeter of the construction site must be inspected to ensure that no unintended stormwater discharge is occurring. • All perimeter Control Measures must be inspected to ensure they are functioning correctly and are in a condition that can reasonably be expected to function appropriately in a future precipitation event. • Any disturbed areas should be inspected to determine if pollution is entering the stormwater system and if any further controls should be implemented to better protect the stormwater system. • All areas where construction site material is stored should be inspected for compliance with this report. Areas should be checked for any spills that may have occurred without being reported and should also be evaluated to determine if additional control measures should be installed to prevent contamination. If necessary, these areas should be checked to ensure that they are covered or protected from precipitation or wind events. • All interior Control Measures should be inspected for performance and should be replaced if found to be deficient. • The site superintendent should monitor the construction activities occurring on-site and install approved controls as necessary even if those controls are not mentioned in this report. • A log of each inspection should be kept on-site at all times and should be made available upon request to any governing agency or jurisdiction, the Environmental Protection Agency, or the Colorado Department of Public Health and Environment. • Maintenance requirements for each Control Measure to ensure each are functioning properly can be found in Appendix B. Maintenance must be completed as soon as a deficiency is identified. If maintenance cannot be completed immediately it must be documents as to the reasons for the delay. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. 10 A log book may be kept for use in tracking other items related to the SWMP such as those listed below. Additional information such as dated photographs, field notebooks, drawings and maps, and the items below, etc. can also be included where appropriate. • Control Measure operation and maintenance • Stormwater contamination • Contacts with suppliers • Notes on the need for and performance of preventive maintenance and other repairs • Implementation of specific items in the SWMP • Training events (given or attended) • Events involving materials handling and storage • Contacts with regulatory agencies and personnel • Notes of employee activities, contact, notifications, etc. This information can also be found in Part I.D of the Construction Permit and should be referenced often to ensure adequate inspection practices are followed. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 A Appendix A: Stormwater Construction Permit AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 B Appendix B: Control Measure Specifications Rolled Erosion Control Products (RECP) EC-6 November 2010 Urban Drainage and Flood Control District RECP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph RECP-1. erosion and providing favorable conditions for revegetation. Description Rolled Erosion Control Products (RECPs) include a variety of temporary or permanently installed manufactured products designed to control erosion and enhance vegetation establishment and survivability, particularly on slopes and in channels. For applications where natural vegetation alone will provide sufficient permanent erosion protection, temporary products such as netting, open weave textiles and a variety of erosion control blankets (ECBs) made of biodegradable natural materials (e.g., straw, coconut fiber) can be used. For applications where natural vegetation alone will not be sustainable under expected flow conditions, permanent rolled erosion control products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats are designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature natural vegetation. Appropriate Uses RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed protection from wind and water erosion. These products are often used on disturbed areas on steep slopes, in areas with highly erosive soils, or as part of drainageway stabilization. In order to select the appropriate RECP for site conditions, it is important to have a general understanding of the general types of these products, their expected longevity, and general characteristics. The Erosion Control Technology Council (ECTC 2005) characterizes rolled erosion control products according to these categories: Mulch control netting: A planar woven natural fiber or extruded geosynthetic mesh used as a temporary degradable rolled erosion control product to anchor loose fiber mulches. Open weave textile: A temporary degradable rolled erosion control product composed of processed natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate vegetation establishment. Erosion control blanket (ECB): A temporary degradable rolled erosion control product composed of processed natural or polymer fibers which are mechanically, structurally or chemically bound together to form a continuous matrix to provide erosion control and facilitate vegetation establishment. ECBs can be further differentiated into rapidly degrading single-net and double-net types or slowly degrading types. Rolled Erosion Control Products Erosion Control Yes EC-6 Rolled Erosion Control Products (RECP) RECP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Turf Reinforcement Mat (TRM): A rolled erosion control product composed of non-degradable synthetic fibers, filaments, nets, wire mesh, and/or other elements, processed into a permanent, three- dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable components, are designed to impart immediate erosion protection, enhance vegetation establishment and provide long-term functionality by permanently reinforcing vegetation during and after maturation. Note: TRMs are typically used in hydraulic applications, such as high flow ditches and channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of natural, unreinforced vegetation or in areas where limited vegetation establishment is anticipated. Tables RECP-1 and RECP-2 provide guidelines for selecting rolled erosion control products appropriate to site conditions and desired longevity. Table RECP-1 is for conditions where natural vegetation alone will provide permanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone will not be adequately stable to provide long-term erosion protection due to flow or other conditions. Rolled Erosion Control Products (RECP) EC-6 November 2010 Urban Drainage and Flood Control District RECP-3 Urban Storm Drainage Criteria Manual Volume 3 Table RECP-1. ECTC Standard Specification for Temporary Rolled Erosion Control Products (Adapted from Erosion Control Technology Council 2005) Product Description Slope Applications* Channel Applications* Tensile 1 Longevity Maximum Gradient C Factor2,5 3,4,6 Mulch Control Nets 5:1 (H:V) ≤ Up to 12 months Erosion Control 4:1 (H:V) ≤0.10 @ 4:1 0.5 lbs/ft2 (24 Pa) 5 lbs/ft (0.073 kN/m) Control Blankets & 3:1 (H:V) ≤0.15 @ 3:1 1.5 lbs/ft2 (72 Pa) 50 lbs/ft (0.73 kN/m) Control Blankets 2:1 (H:V) ≤ 2:1 (84 Pa) (1.09 kN/m) Mulch Control Nets 5:1 (H:V) ≤ 5:1 (12 Pa) (0.36 kN/m) 24 months Blankets & Open Weave Textiles 1.5:1 (H:V) ≤0.25 @ 1.5:1 2.00 lbs/ft2 (96 Pa) 100 lbs/ft (1.45 kN/m) 24 months Blankets & Open Weave Textiles 1:1 (H:V) ≤0.25 @ 1:1 2.25 lbs/ft2 (108 Pa) 125 lbs/ft (1.82 kN/m) 36 months * C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction with pre-applied mulch material. (See Section 5.3 of Chapter 7 Construction BMPs for more information on the C Factor.) 1 Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035. 2 C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greater gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing. 3 Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess erosion (> 12.7 mm (0.5 in) soil loss) during a 30-minute flow event in large-scale testing. 4 The permissible shear stress levels established for each performance category are based on historical experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05. 5 Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed acceptable by the engineer. 6 Per the engineer’s discretion. Recommended acceptable large-scale testing protocol may include ASTM D 6460, or other independent testing deemed acceptable by the engineer. EC-6 Rolled Erosion Control Products (RECP) RECP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Table RECP-2. ECTC Standard Specification for Permanent1 Rolled Erosion Control Products (Adapted from: Erosion Control Technology Council 2005) Product Type Channel Applications TRMs with a minimum thickness of 0.25 inches (6.35 mm) per ASTM D 6525 and UV stability of 80% per ASTM D 4355 (500 hours exposure). Maximum Gradient Maximum Shear Stress4,5 Tensile 2,3 0.5:1 (H:V) 6.0 lbs/ft2 (288 Pa) 125 lbs/ft (1.82 kN/m) 0.5:1 (H:V) 8.0 lbs/ft2 (384 Pa) 150 lbs/ft (2.19 kN/m) 0.5:1 (H:V) 10.0 lbs/ft2 (480 Pa) 175 lbs/ft (2.55 kN/m) 1 For TRMs containing degradable components, all property values must be obtained on the non- degradable portion of the matting alone. 2 Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM D 6818 (Supersedes Mod. ASTM D 5035 for RECPs) 3 Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM with a tensile strength of 44 kN/m (3,000 lb/ft) or greater. 4 Required minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess erosion (> 12.7 mm (0.5 in.) soil loss) during a 30-minute flow event in large scale testing. 5 Acceptable large-scale testing protocols may include ASTM D 6460, or other independent testing deemed acceptable by the engineer. Design and Installation RECPs should be installed according to manufacturer’s specifications and guidelines. Regardless of the type of product used, it is important to ensure no gaps or voids exist under the material and that all corners of the material are secured using stakes and trenching. Continuous contact between the product and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control products. Often wooden stakes are used to anchor RECPs; however, wood stakes may present installation and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have had favorable experiences using biodegradable stakes. This BMP Fact Sheet provides design details for several commonly used ECB applications, including: ECB-1 Pipe Outlet to Drainageway ECB-2 Small Ditch or Drainageway ECB-3 Outside of Drainageway Rolled Erosion Control Products (RECP) EC-6 November 2010 Urban Drainage and Flood Control District RECP-5 Urban Storm Drainage Criteria Manual Volume 3 Staking patterns are also provided in the design details according to these factors: ECB type Slope or channel type For other types of RECPs including TRMs, these design details are intended to serve as general guidelines for design and installation; however, engineers should adhere to manufacturer’s installation recommendations. Maintenance and Removal Inspection of erosion control blankets and other RECPs includes: Check for general signs of erosion, including voids beneath the mat. If voids are apparent, fill the void with suitable soil and replace the erosion control blanket, following the appropriate staking pattern. Check for damaged or loose stakes and secure loose portions of the blanket. Erosion control blankets and other RECPs that are biodegradable typically do not need to be removed after construction. If they must be removed, then an alternate soil stabilization method should be installed promptly following removal. Turf reinforcement mats, although generally resistant to biodegradation, are typically left in place as a dense vegetated cover grows in through the mat matrix. The turf reinforcement mat provides long-term stability and helps the established vegetation resist erosive forces. EC-6 Rolled Erosion Control Products (RECP) RECP-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rolled Erosion Control Products (RECP) EC-6 November 2010 Urban Drainage and Flood Control District RECP-7 Urban Storm Drainage Criteria Manual Volume 3 EC-6 Rolled Erosion Control Products (RECP) RECP-8 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rolled Erosion Control Products (RECP) EC-6 November 2010 Urban Drainage and Flood Control District RECP-9 Urban Storm Drainage Criteria Manual Volume 3 Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CWA-1. Example of concrete washout area. Note gravel tracking pad for access and sign. Description Concrete waste management involves designating and properly managing a specific area of the construction site as a concrete washout area. A concrete washout area can be created using one of several approaches designed to receive wash water from washing of tools and concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks. Three basic approaches are available: excavation of a pit in the ground, use of an above ground storage area, or use of prefabricated haul- away concrete washout containers. Surface discharges of concrete washout water from construction sites are prohibited. Appropriate Uses Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid concrete waste from onsite concrete mixing or concrete delivery. Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete washout, the soil must have adequate buffering capacity to result in protection of state groundwater standards; otherwise, a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater: The use of the washout site should be temporary (less than 1 year), and The washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. Design and Installation Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner. Although unlined washout areas may be used, lined pits may be required to protect groundwater under certain conditions. Do not locate an unlined washout area within 400 feet of any natural drainage pathway or waterbody or within 1,000 feet of any wells or drinking water sources. Even for lined concrete washouts, it is advisable to locate the facility away from waterbodies and drainage paths. If site constraints make these Concrete Washout Area Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-1 Concrete Washout Area (CWA) CWA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated concrete washout devices or a lined aboveground storage area should be used. Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage areas. Pre-fabricated concrete washout container information can be obtained from vendors. Maintenance and Removal A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that adequate signage is provided and in good repair and that the washout area is being used, as opposed to washout in non-designated areas of the site. Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal location. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash water is allowed to evaporate and the concrete hardens, it may be recycled. Photograph CWA-3.Earthen concrete washout. Photo courtesy of CDOT. Photograph CWA-2.Prefabricated concrete washout. Photo courtesy of CDOT. Concrete Washout Area (CWA) MM-1 November 2010 Urban Drainage and Flood Control District CWA-3 Urban Storm Drainage Criteria Manual Volume 3 MM-1 Concrete Washout Area (CWA) CWA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph IP-1. Inlet protection for a curb opening inlet. Description Inlet protection consists of permeable barriers installed around an inlet to filter runoff and remove sediment prior to entering a storm drain inlet. Inlet protection can be constructed from rock socks, sediment control logs, silt fence, block and rock socks, or other materials approved by the local jurisdiction. Area inlets can also be protected by over-excavating around the inlet to form a sediment trap. Appropriate Uses Install protection at storm sewer inlets that are operable during construction. Consider the potential for tracked-out sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets must be protected. This may include inlets in the general proximity of the construction area, not limited to downgradient inlets. Inlet protection is not Design and Installation a stand-alone BMP and should be used in conjunction with other upgradient BMPs. To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet to function without completely blocking flows into the inlet in a manner that causes localized flooding. When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a curb and gutter setting, but are effective area inlet protection measures. Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary products are available for inlet protection that may be approved for use by local governments. If proprietary products are used, design details and installation procedures from the manufacturer must be followed. Regardless of the type of inlet protection selected, inlet protection is most effective when combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier before runoff enters the storm sewer or receiving water. Design details with notes are provided for these forms of inlet protection: IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade Inlets IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade Inlets Inlet Protection (various forms) Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-6 Inlet Protection (IP) IP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 IP-3. Rock Sock Inlet Protection for Sump/Area Inlet IP-4. Silt Fence Inlet Protection for Sump/Area Inlet IP-5. Over-excavation Inlet Protection IP-6. Straw Bale Inlet Protection for Sump/Area Inlet CIP-1. Culvert Inlet Protection Propriety inlet protection devices should be installed in accordance with manufacturer specifications. More information is provided below on selecting inlet protection for sump and on-grade locations. Inlets Located in a Sump When applying inlet protection in sump conditions, it is important that the inlet continue to function during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger storms without excessive localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing localized flooding, public safety issues, and downstream erosion and damage from bypassed flows. Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary products providing equivalent functions. Inlets Located on a Slope For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads, also see the Check Dam Fact Sheet. Maintenance and Removal Inspect inlet protection frequently. Inspection and maintenance guidance includes: Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents of the BMP (e.g., gravel) washing into the inlet. Check for improper installation resulting in untreated flows bypassing the BMP and directly entering the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been properly trenched around the inlet can result in flows under the silt fence and directly into the inlet. Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also crush or displace the BMP. Monitor sediment accumulation upgradient of the inlet protection. Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-3 Urban Storm Drainage Criteria Manual Volume 3 Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches. Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain the functionality of the BMP. Propriety inlet protection devices should be inspected and maintained in accordance with manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed in a timely manner to prevent devices from breaking and spilling sediment into the storm drain. Inlet protection must be removed and properly disposed of when the drainage area for the inlet has reached final stabilization. SC-6 Inlet Protection (IP) IP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-5 Urban Storm Drainage Criteria Manual Volume 3 SC-6 Inlet Protection (IP) IP-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC-6 November 2010 Urban Drainage and Flood Control District IP-7 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) SC-5 November 2010 Urban Drainage and Flood Control District RS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph RS-1. Rock socks placed at regular intervals in a curb line can help reduce sediment loading to storm sewer inlets. Rock socks can also be used as perimeter controls. Description A rock sock is constructed of gravel that has been wrapped by wire mesh or a geotextile to form an elongated cylindrical filter. Rock socks are typically used either as a perimeter control or as part of inlet protection. When placed at angles in the curb line, rock socks are typically referred to as curb socks. Rock socks are intended to trap sediment from stormwater runoff that flows onto roadways as a result of construction activities. Appropriate Uses Rock socks can be used at the perimeter of a disturbed area to control localized sediment loading. A benefit of rock socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the ground; therefore, they are often used on roadway construction projects where paved surfaces are present. Use rock socks in inlet protection applications when the construction of a roadway is substantially complete and the roadway has been directly connected to a receiving storm system. Design and Installation When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per 100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are used for inlet protection and in the curb line. When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert drivers and street maintenance workers of their presence. Maintenance and Removal Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to maintain the functionality of the BMP, typically when sediment has accumulated behind the rock sock to one-half of the sock's height. Once upstream stabilization is complete, rock socks and accumulated sediment should be removed and properly disposed. Rock Sock Functions Erosion Control No Sediment Control Yes Site/Material Management No SC-5 Rock Sock (RS) RS-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) SC-5 November 2010 Urban Drainage and Flood Control District RS-3 Urban Storm Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J-hook" perimeter control at the corner of a construction site. Description A sediment control log is a linear roll made of natural materials such as straw, coconut fiber, or compost. The most common type of sediment control log has straw filling and is often referred to as a "straw wattle." All sediment control logs are used as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses Sediment control logs can be used in the following applications to trap sediment: As perimeter control for stockpiles and the site. As part of inlet protection designs. As check dams in small drainage ditches. (Sediment control logs are not intended for use in channels with high flow velocities.) On disturbed slopes to shorten flow lengths (as an erosion control). As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland. Sediment control logs work well in combination with other layers of erosion and sediment controls. Design and Installation Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP. Sediment Control Log Functions Erosion Control Moderate Sediment Control Yes Site/Material Management No SC-2 Sediment Control Log (SCL) SCL-2 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed as if they are impermeable. Design details and notes for sediment control logs are provided in the following details. Sediment logs must be properly installed per the detail to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to flow). Improper installation can lead to poor performance. Be sure that sediment control logs are properly trenched (if lighter than 8 lb/foot), anchored and tightly jointed. Maintenance and Removal Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the depth is one-half the height of the sediment log and repair damage to the sediment log, typically by replacing the damaged section. Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically appropriate when used in perimeter control, inlet protection and check dam applications. Compost from compost sediment control logs may be spread over the area and seeded as long as this does not cover newly established vegetation. Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-3 Urban Storm Drainage Criteria Manual Volume 3 SC-2 Sediment Control Log (SCL) SCL-4 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-5 Urban Storm Drainage Criteria Manual Volume 3 SC-2 Sediment Control Log (SCL) SCL-6 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SSA-1. Example of a staging area with a gravel surface to prevent mud tracking and reduce runoff. Photo courtesy of Douglas County. Description A stabilized staging area is a clearly designated area where construction equipment and vehicles, stockpiles, waste bins, and other construction-related materials are stored. The contractor office trailer may also be located in this area. Depending on the size of the construction site, more than one staging area may be necessary. Appropriate Uses Most construction sites will require a staging area, which should be clearly designated in SWMP drawings. The layout of the staging area may vary depending on the type of construction activity. Staging areas located in roadways due to space constraints require special measures to avoid materials being washed into storm inlets. Design and Installation Stabilized staging areas should be completed prior to other construction activities beginning on the site. Major components of a stabilized staging area include: Appropriate space to contain storage and provide for loading/unloading operations, as well as parking if necessary. A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger. Perimeter controls such as silt fence, sediment control logs, or other measures. Construction fencing to prevent unauthorized access to construction materials. Provisions for Good Housekeeping practices related to materials storage and disposal, as described in the Good Housekeeping BMP Fact Sheet. A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet, to accommodate traffic associated with material delivery and waste disposal vehicles. Over-sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that required for the project. This increases costs, as well as requirements for long-term stabilization following the construction period. When designing the stabilized staging area, minimize the area of disturbance to the extent practical. Stabilized Staging Area Functions Erosion Control Yes Sediment Control Moderate Site/Material Yes SM-6 Stabilized Staging Area (SSA) SSA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when materials staging in roadways is required. Maintenance and Removal Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing perimeter controls, and following good housekeeping practices. When construction is complete, debris, unused stockpiles and materials should be recycled or properly disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface cover planned for the development. Minimizing Long-Term Stabilization Requirements Utilize off-site parking and restrict vehicle access to the site. Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed otherwise. Consider use of a bermed contained area for materials and equipment that do not require a stabilized surface. Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise disturbed. Stabilized Staging Area (SSA) SM-6 November 2010 Urban Drainage and Flood Control District SSA-3 Urban Storm Drainage Criteria Manual Volume 3 SM-6 Stabilized Staging Area (SSA) SSA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CF-1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County. Description A construction fence restricts site access to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive areas such as natural areas to be preserved as open space, wetlands and riparian areas. Appropriate Uses A construction fence can be used to delineate the site perimeter and locations within the site where access is restricted to protect natural resources such as wetlands, waterbodies, trees, and other natural areas of the site that should not be disturbed. If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures. Design and Installation Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s recommendations. See Detail CF-1 for typical installations. Do not place construction fencing in areas within work limits of machinery. Maintenance and Removal Inspect fences for damage; repair or replace as necessary. Fencing should be tight and any areas with slumping or fallen posts should be reinstalled. Fencing should be removed once construction is complete. Construction Fence Functions Erosion Control No Sediment Control No Site/Material Management Yes SM-3 Construction Fence (CF) CF-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 November 2010 Urban Drainage and Flood Control District CF-3 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking. Description Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface. Appropriate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions: Wet weather periods when mud is easily tracked off site. During dry weather periods where dust is a concern. When poorly drained, clayey soils are present on site. Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites. Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including: VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires. VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance. Vehicle Tracking Control Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes SM-4 Vehicle Tracking Control (VTC) VTC-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore. VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site. Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff. Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary. With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way. Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance. Ensure that drainage ditches at the entrance/exit area remain clear. A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized. When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding. When a construction entrance/exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving. Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-5 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 C Appendix C: Existing Soil & Site Information Soil Map—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL MAP) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 3 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 496320 496350 496380 496410 496440 496470 496500 496320 496350 496380 496410 496440 496470 496500 40° 32' 4'' N 10 5 ° 2 ' 3 6 ' ' W 40° 32' 4'' N 10 5 ° 2 ' 2 8 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 3 6 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 2 8 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout 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 Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 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. Soil Map—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL MAP) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 73 Nunn clay loam, 0 to 1 percent slopes 7.0 96.3% 74 Nunn clay loam, 1 to 3 percent slopes 0.3 3.7% Totals for Area of Interest 7.2 100.0% Soil Map—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - SOIL MAP Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 3 of 3 Hydrologic Soil Group—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - HYDROLOGIC SOIL GROUP) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 4 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 496320 496350 496380 496410 496440 496470 496500 496320 496350 496380 496410 496440 496470 496500 40° 32' 4'' N 10 5 ° 2 ' 3 6 ' ' W 40° 32' 4'' N 10 5 ° 2 ' 2 8 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 3 6 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 2 8 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 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. Hydrologic Soil Group—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - HYDROLOGIC SOIL GROUP) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 73 Nunn clay loam, 0 to 1 percent slopes C 7.0 96.3% 74 Nunn clay loam, 1 to 3 percent slopes C 0.3 3.7% Totals for Area of Interest 7.2 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Hydrologic Soil Group—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - HYDROLOGIC SOIL GROUP Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 3 of 4 Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - HYDROLOGIC SOIL GROUP Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 4 of 4 Depth to Water Table—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - GROUNDWATER DEPTH) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 3 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 496320 496350 496380 496410 496440 496470 496500 496320 496350 496380 496410 496440 496470 496500 40° 32' 4'' N 10 5 ° 2 ' 3 6 ' ' W 40° 32' 4'' N 10 5 ° 2 ' 2 8 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 3 6 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 2 8 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Soil Rating Lines 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Soil Rating Points 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 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. Depth to Water Table—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - GROUNDWATER DEPTH) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 3 Depth to Water Table Map unit symbol Map unit name Rating (centimeters)Acres in AOI Percent of AOI 73 Nunn clay loam, 0 to 1 percent slopes >200 7.0 96.3% 74 Nunn clay loam, 1 to 3 percent slopes >200 0.3 3.7% Totals for Area of Interest 7.2 100.0% Description "Water table" refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors (redoximorphic features) in the soil. A saturated zone that lasts for less than a month is not considered a water table. This attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: centimeters Aggregation Method: Dominant Component Component Percent Cutoff: None Specified Tie-break Rule: Lower Interpret Nulls as Zero: No Beginning Month: January Ending Month: December Depth to Water Table—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - GROUNDWATER DEPTH Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 3 of 3 Hydrologic Soil Group and Surface Runoff This table gives estimates of various soil water features. The estimates are used in land use planning that involves engineering considerations. Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The four hydrologic soil groups are: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Surface runoff refers to the loss of water from an area by flow over the land surface. Surface runoff classes are based on slope, climate, and vegetative cover. The concept indicates relative runoff for very specific conditions. It is assumed that the surface of the soil is bare and that the retention of surface water resulting from irregularities in the ground surface is minimal. The classes are negligible, very low, low, medium, high, and very high. Report—Hydrologic Soil Group and Surface Runoff Absence of an entry indicates that the data were not estimated. The dash indicates no documented presence. Hydrologic Soil Group and Surface Runoff–Larimer County Area, Colorado Map symbol and soil name Pct. of map unit Surface Runoff Hydrologic Soil Group 73—Nunn clay loam, 0 to 1 percent slopes Nunn 85 Medium C Hydrologic Soil Group and Surface Runoff---Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - GROUNDWATER DEPTH Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 2 Hydrologic Soil Group and Surface Runoff–Larimer County Area, Colorado Map symbol and soil name Pct. of map unit Surface Runoff Hydrologic Soil Group 74—Nunn clay loam, 1 to 3 percent slopes Nunn 85 Medium C Data Source Information Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Hydrologic Soil Group and Surface Runoff---Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - GROUNDWATER DEPTH Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 2 Wind Erodibility Group—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL ERODIBILITY) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 3 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 496320 496350 496380 496410 496440 496470 496500 496320 496350 496380 496410 496440 496470 496500 40° 32' 4'' N 10 5 ° 2 ' 3 6 ' ' W 40° 32' 4'' N 10 5 ° 2 ' 2 8 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 3 6 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 2 8 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons 1 2 3 4 4L 5 6 7 8 Not rated or not available Soil Rating Lines 1 2 3 4 4L 5 6 7 8 Not rated or not available Soil Rating Points 1 2 3 4 4L 5 6 7 8 Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 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. Wind Erodibility Group—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL ERODIBILITY) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 3 Wind Erodibility Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 73 Nunn clay loam, 0 to 1 percent slopes 6 7.0 96.3% 74 Nunn clay loam, 1 to 3 percent slopes 6 0.3 3.7% Totals for Area of Interest 7.2 100.0% Description A wind erodibility group (WEG) consists of soils that have similar properties affecting their susceptibility to wind erosion in cultivated areas. The soils assigned to group 1 are the most susceptible to wind erosion, and those assigned to group 8 are the least susceptible. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Lower Wind Erodibility Group—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - SOIL ERODIBILITY Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 3 of 3 K Factor, Whole Soil—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL RAINFALL ERODIBILITY) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 1 of 3 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 44 8 6 8 5 0 44 8 6 8 8 0 44 8 6 9 1 0 44 8 6 9 4 0 44 8 6 9 7 0 44 8 7 0 0 0 44 8 7 0 3 0 44 8 7 0 6 0 44 8 7 0 9 0 496320 496350 496380 496410 496440 496470 496500 496320 496350 496380 496410 496440 496470 496500 40° 32' 4'' N 10 5 ° 2 ' 3 6 ' ' W 40° 32' 4'' N 10 5 ° 2 ' 2 8 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 3 6 ' ' W 40° 31' 56'' N 10 5 ° 2 ' 2 8 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 15 30 60 90 Meters Map Scale: 1:1,270 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons .02 .05 .10 .15 .17 .20 .24 .28 .32 .37 .43 .49 .55 .64 Not rated or not available Soil Rating Lines .02 .05 .10 .15 .17 .20 .24 .28 .32 .37 .43 .49 .55 .64 Not rated or not available Soil Rating Points .02 .05 .10 .15 .17 .20 .24 .28 .32 .37 .43 .49 .55 .64 Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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: Larimer County Area, Colorado Survey Area Data: Version 19, Aug 29, 2024 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 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. K Factor, Whole Soil—Larimer County Area, Colorado (AXIS ACADEMY INTERNATIONAL - SOIL RAINFALL ERODIBILITY) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 2 of 3 K Factor, Whole Soil Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 73 Nunn clay loam, 0 to 1 percent slopes .32 7.0 96.3% 74 Nunn clay loam, 1 to 3 percent slopes .28 0.3 3.7% Totals for Area of Interest 7.2 100.0% Description Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water. Factor K is one of six factors used in the Universal Soil Loss Equation (USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the average annual rate of soil loss by sheet and rill erosion in tons per acre per year. The estimates are based primarily on percentage of silt, sand, and organic matter and on soil structure and saturated hydraulic conductivity (Ksat). Values of K range from 0.02 to 0.69. Other factors being equal, the higher the value, the more susceptible the soil is to sheet and rill erosion by water. "Erosion factor Kw (whole soil)" indicates the erodibility of the whole soil. The estimates are modified by the presence of rock fragments. Factor K does not apply to organic horizons and is not reported for those layers. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable) K Factor, Whole Soil—Larimer County Area, Colorado AXIS ACADEMY INTERNATIONAL - SOIL RAINFALL ERODIBILITY Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/15/2025 Page 3 of 3 National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS Without Base Flood Elevation (BFE) Zone A, V, A99 With BFE or Depth Zone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to Levee Zone D NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood Hazard Zone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 9/15/2025 at 6:50 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. 1:6,000 105°2'51"W 40°32'14"N 105°2'13"W 40°31'47"N Basemap Imagery Source: USGS National Map 2023 WATERS GeoViewer Print Map - 3939 Automation Way US EPA, Esri, NASA, NGA, USGS, Sources: Esri, TomTom, Garmin, FAO, NOAA, USGS, (c) OpenStreetMap contributors, and the GIS User Result: Link Path Result: Reached WQP Point Linked Data Result: Streams Selected Result: Catchments Selected Result: Delineated Area Streams Flow Direction 9/15/2025, 1:32:14 PM 0 0.95 1.90.47 mi 0 1.5 30.75 km 1:72,224 US Environment Protection Agency City of Fort Collins, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, US Census Bureau, USDA, USFWS | Esri, NASA, NGA, USGS, FEMA | US EPA | 3939 Automation Way Cache la Poudre River AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 D Appendix D: Stormwater Inspection Report 31 | Appendix D: Stormwater Inspection Report Template Facility Name Permittee Date of Inspection Weather Conditions Permit Certification # Disturbed Acreage Phase of Construction Inspector Title Inspector Name Is the above inspector a qualified stormwater manager? (permittee is responsible for ensuring that the inspector is a qualified stormwater manager) YES NO INSPECTION FREQUENCY Check the box that describes the minimum inspection frequency utilized when conducting each inspection At least one inspection every 7 calendar days At least one inspection every 14 calendar days, with post-storm event inspections conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosions This is this a post-storm event inspection. Event Date: _____________________ Reduced inspection frequency - Include site conditions that warrant reduced inspection frequency Post-storm inspections at temporarily idle sites Inspections at completed sites/area Winter conditions exclusion Have there been any deviations from the minimum inspection schedule? If yes, describe below. YES NO INSPECTION REQUIREMENTS* i. Visually verify all implemented control measures are in effective operational condition and are working as designed in the specifications ii. Determine if there are new potential sources of pollutants iii. Assess the adequacy of control measures at the site to identify areas requiring new or modified control measures to minimize pollutant discharges iv. Identify all areas of non-compliance with the permit requirements, and if necessary, implement corrective action *Use the attached Control Measures Requiring Routine Maintenance and Inadequate Control Measures Requiring Corrective Action forms to document results of this assessment that trigger either maintenance or corrective actions AREAS TO BE INSPECTED Is there evidence of, or the potential for, pollutants leaving the construction site boundaries, entering the stormwater drainage system or discharging to state waters at the following locations? NO YES If "YES” describe discharge or potential for discharge below. Document related maintenance, inadequate control measures and corrective actions Inadequate Control Measures Requiring Corrective Action form Construction site perimeter All disturbed areas Designated haul routes Material and waste storage areas exposed to precipitation Locations where stormwater has the potential to discharge offsite Locations where vehicles exit the site Other: ____________________ CONTROL MEASURES REQUIRING ROUTINE MAINTENANCE Definition: Any control measure that is still operating in accordance with its design and the requirements of the permit, but requires maintenance to prevent a breach of the control measure. These items are not subject to the corrective action requirements as specified in Part I.B.1.c of the permit. Are there control measures requiring maintenance? NO YES If “YES” document below Date Observed Location Control Measure Maintenance Required Date Completed INADEQUATE CONTROL MEASURES REQUIRING CORRECTIVE ACTION Definition: Any control measure that is not designed or implemented in accordance with the requirements of the permit and/or any control measure that is not implemented to operate in accordance with its design. This includes control measures that have not been implemented for pollutant sources. If it is infeasible to install or repair the control measure immediately after discovering the deficiency the reason must be documented and a schedule included to return the control measure to effective operating condition as possible. Are there inadequate control measures requiring corrective action? NO YES If “YES” document below Are there additional control measures needed that were not in place at the time of inspection? NO YES If “YES” document below Date Discovered Location Description of Inadequate Control Measure Description of Corrective Action Was deficiency corrected when discovered? YES/NO if “NO” provide reason and schedule to correct Date Corrected REPORTING REQUIREMENTS The permittee shall report the following circumstances orally within twenty-four (24) hours from the time the permittee becomes aware of the circumstances, and shall mail to the division a written report containing the information requested within five (5) working days after becoming aware of the following circumstances. The division may waive the written report required if the oral report has been received within 24 hours. All Noncompliance Requiring 24-Hour Notification per Part II.L.6 of the Permit a. Endangerment to Health or the Environment This category would primarily result from the discharge of pollutants in violation of the permit b. Numeric Effluent Limit Violations o o o Numeric effluent limits are very uncommon in certifications under the COR400000 general permit. This category of noncompliance only applies if numeric effluent limits are included in a permit certification. Has there been an incident of noncompliance requiring 24-hour notification? NO YES If “YES” document below Date and Time of Incident Location Description of Noncompliance Description of Corrective Action Date and Time of 24 Hour Oral Notification Date of 5 Day Written Notification * *Attach copy of 5 day written notification to report. Indicate if written notification was waived, including the name of the division personnel who granted waiver. After adequate corrective action(s) and maintenance have been taken, or where a report does not identify any incidents requiring corrective action or maintenance, the individual(s) designated as the Qualified Stormwater Manager, shall sign and certify the below statement: “I verify that, to the best of my knowledge and belief, all corrective action and maintenance items identified during the inspection are complete, and the site is currently in compliance with the permit.” _________________________________ ____________________________________ Name of Qualified Stormwater Manager Title of Qualified Stormwater Manager _________________________________ _____________________________________ Signature of Qualified Stormwater Manager Date Notes/Comments AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 E Appendix E: Erosion Control Plan and Details THRULANEDROPOFFLANE DROPOFFLANE THRULANE ONLY DROPOFF DROPOFF NO STO P P I N G - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org 1 COVER SEDIMENT & EROSION CONTROL PLANS FOR THE AXIS INTERNATIONAL ACADEMY LOT 1, COLLINDALE BUSINESS PARK, FTC LOCATED IN THE SOUTHEAST QUARTER OF THE NORTHEAST QUARTER OF SECTION 31, TOWNSHIP 7 NORTH, RANGE 68 WEST OF THE SIXTH PRINCIPAL MERIDIAN, COUNTY OF LARIMER, STATE OF COLORADO VICINITY MAP 1"=1,000' N PROJECT LOCATION WARREN LAKE E HORSETOOTH RD E HARMONY RD S T I M B E R L I N E R D ZI E G L E R R D S L E M A Y A V E S L E M A Y A V E UN I O N P A C I F I C R A I L R O A D PROJECT DIRECTORY SHEET INDEX PAGE SHEET TITLE 1 COVER 2 NOTES 3 EROSION CONTROL PLAN 4 DETAILS 5 DETAILS 6 DETAILS OWNER NAME:AXIS INTERNATIONAL ACADEMY CONTACT:JENNY WHITAKER FINANCE & OPERATIONS MANAGER ADDRESS:2700 S. LEMAY AVENUE FORT COLLINS, COLORADO 80525 PHONE:(970) 658-4199 E-MAIL:jwhitaker@axiscolorado.org OWNER REP NAME:AGORA WEST REAL ESTATE GROUP, INC. CONTACT:JEFF REED ADDRESS:PO BOX 2032 FORT COLLINS, COLORADO 80522 PHONE:(970) 556-0406 E-MAIL:jeff@agorawest.com ARCHITECT NAME:RB+B ARCHITECTS CONTACT:JOSH MCGARVEY, AIA, LEED AP ADDRESS:315 MOUNTAIN AVENUE #100 FORT COLLINS, COLORADO 80524 PHONE:(970) 488-3880 MOBILE:(217) 721-5679 E-MAIL:jmcgarvey@rbbarchitects.com LANDSCAPE ARCHITECT NAME:BHA DESIGN INCORPORATED CONTACT:ANGELA K. MILEWSKI ADDRESS:111 S MELDRUM STREET, SUITE 110 FORT COLLINS, COLORADO 80521 PHONE:(970) 305-3937 E-MAIL:amilewski@bhadesign.com SURVEYOR NAME:MAJESTIC SURVEYING, LLC CONTACT:STEVEN PARKS, PLS ADDRESS:1111 DIAMOND VALLEY DR #104 WINDSOR, COLORADO 80550 PHONE:(970) 833-5698 MOBILE:(970) 443-0882 E-MAIL:stevenp@majesticsurveying.com ENGINEER NAME:COLORADO CIVIL GROUP, INC. CONTACT:LINDSEY GREEN, PE ADDRESS:2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 PHONE:(970) 278-0029 X 102 MOBILE:(970) 310-5111 E-MAIL:lgreen@ccginc.us - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org CITY OF FORT COLLINS - CONSTRUCTION CONTROL MEASURES STANDARD NOTES “” “” 2 NOTES CONSTRUCTION SEQUENCING: AU T O M A T I O N W A Y AXIS INTERNATIONAL ACADEMY UN I O N P A C I F I C R A I L R O A D NOTE: ALL TREES TO REMAIN UNDISTURBED UNLESS SPECIFIED ON LANDSCAPE PLANS PS SCL/SFSCL/SF SCL/SF SCL/SF WD WD WDWD WD RS RS IP PS PS PS PS 1.CONTRACTOR SHALL COORDINATE CONSTRUCTION SCHEDULE WITH OWNER, AND ENSURE ANY DISRUPTION OF SCHOOL ACTIVITIES IS KNOWN TO OWNER. 2.CONTRACTOR SHALL INSTALL CONSTRUCTION FENCING AROUND WORK AREA AND RESTRICT PUBLIC ACCESS. 3.LIMITS OF REMOVAL SHOWN ON THIS SHEET ARE APPROXIMATE, CONTRACTOR SHALL DETERMINE EXTENTS BASED ON INSTALLATION METHODS. 4.ALL EXISTING UTILITIES AND SITE FEATURES SHALL BE PROTECTED IN PLACE UNLESS NOTED OTHERWISE ON PLANS. 5.THE CONTRACTOR SHALL DISPOSE OF ALL CONCRETE, ASPHALT RUBBLE, EXCAVATED SOILS, AND ANY OTHER DEMOLISHED/ REMOVED MATERIAL OFFSITE. 6.CONTRACTOR SHALL STOCKPILE SOD AND TOPSOIL TO BE REPLACED AT A PLACE COORDINATED WITH THE OWNER. DEGRADED SOD AND TOPSOIL CAN BE USED FOR AN ORGANIC AMENDMENT TO SOIL. 7.CONCRETE SHALL BE REMOVED TO THE NEAREST JOINT, WHERE PRACTICAL. 8.EXISTING TREES AND EXISTING LANDSCAPING SHALL BE PROTECTED IN PLACE DURING CONSTRUCTION, UNLESS NOTED OTHERWISE ON THE PLANS. 9.DAMAGE DURING CONSTRUCTION ACTIVITIES CAUSED BY THE CONTRACTOR TO ANY EXISTING FEATURE, UTILITIES, FENCING, LANDSCAPING, TREES, VEGETATION, IRRIGATION, DRIVEWAYS/ACCESS ROADS, PUBLIC ROADWAYS, ETC. SHALL BE REPAIRED OR REPLACED TO A CONDITION EQUAL TO OR BETTER THAN EXISTING. 10.CONSTRUCTION ACTIVITIES SHALL NOT EXTEND TO ADJACENT PROPERTIES UNLESS NOTED. 11.DISTURBANCE LIMITS SHALL BE KEPT TO A MINIMUM. ANY SOD THAT IS DISTURBED, DAMAGED, AND/OR REMOVED SHALL BE REPLACED, AND BE FLUSH WITH ADJACENT SOD. 12.THE CONTRACTOR SHALL HAVE ON-SITE AT ALL TIMES THE STORMWATER MANAGEMENT PLAN AND FOLLOW ALL RECOMMENDATIONS CONTAINED WITHIN. 13.THE CONTRACTOR SHALL RECORD CHANGES TO THE SITE'S STORMWATER MANAGEMENT PLAN AS CONSTRUCTION ACTIVITIES DICTATE. 14.ALL AREAS NOT PAVED OR LANDSCAPED SHALL BE RE-SEEDED WITH NATIVE SEED MIX SUPPLIED BY A LOCAL SEED COMPANY AND SUITED FOR PROJECT LOCATION. 15.THE CONTRACTOR SHALL REFER TO OTHER DISCIPLINE DRAWINGS FOR ANY ADDITIONAL DEMOLITION OR COORDINATION ITEMS. GENERAL NOTES CONSTRUCTION FENCE SEDIMENT CONTROL LOG/SILT FENCE STRAW WATTLE ROCK SOCK INLET PROTECTION PERMANENT SEEDING EROSION CONTROL X LEGEND GENERAL PROPERTY LINE CF SCL/SF WD RS IP PS - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M 09/08/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org 3 EROSION CONTROL PLAN - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org 4 DETAILS - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org 5 DETAILS - P L O T D A T E PR O J E C T I N F O R M A T I O N SH E E T I N F O R M A T I O N PR O J E C T P H A S E AR C H I T E C T SE A L ISSUE DATE: PROJECT #: CO N S U L T A N T T - 970.484.0117 F - 970.484.0264 315 East Mountain Ave Suite 100 Fort Collins, CO 80524-2913 © 2015 www.rbbarchitects.com ARCHITECTS REVISIONS: SI T E P L A N A D V I S O R Y RE V I E W 12 / 4 / 2 0 2 4 9 : 2 7 : 1 0 A M 2513 AX I S I N T E R N A T I O N A L AC A D E M Y 09/18/2025 39 3 9 A U T O M A T I O N W A Y FO R T C O L L I N S , C O 8 0 5 2 5 DESCRIPTION DATE 2204 HOFFMAN DRIVE LOVELAND, COLORADO 80538 (970) 278-0029 CCG COLORADO CIVIL GROUP, INC. ENGINEERING CONSULTANTS CALL THE UTILITY NOTIFICATION CENTER OF COLORADO 3 DAYS BEFORE YOU DIG 811 OR 1-800-922-1987 www.UNCC.org 6 DETAILS AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 F Appendix F: Spill Prevention and Response Plan AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. In case of release that meets or exceeds reportable quantities then contact the CDPHE within a 24-hour period. A written report will be required to be filed within 5 days SPILL PREVENTION AND RESPONSE PLAN Emergency Local Fire, Police or Ambulance 911 CMS Environmental Solutions 720-343-6561 EPA National Response Center 1-800-424-8802 Colorado Department of Public Health and Environment 1-877-518-5608 Colorado Emergency Planning Committee 303-273-1622 City of Fort Collins – Building Services 970-416-2740 Reporting • Document and record all significant spills, discharges, overflows, upsets, events in the SWMP and on the Map immediately. • Report significant spills to local agencies, such as the Fire Department; they can assist in cleanup. • Federal regulations require that any oil spill into a water body or onto an adjoining waterline that results in a sheen be reported to the National Response Center (NRC) at 800-424-8802 (24 hours). Use the following measures related to specific activities: Description and Purpose Prevent or reduce the discharge of pollutants to drainage systems or watercourses from leaks and spills by reducing the chance for spills, stopping the source of spills, containing and cleaning up spills, properly disposing of spill materials, and training employees. • Fuels • Lubricants • Other petroleum distillates • Concrete • Fertilizers Limitations • In some cases it may be necessary to use a private spill cleanup company. • This BMP applies to spills caused by the contractor and subcontractors. • Procedures and practices presented in this BMP are general. Contractor should identify appropriate practices for the specific materials used or stored onsite. Implementation The following steps will help reduce the stormwater impacts of leaks and spills • Education: o Be aware that different materials pollute in different amounts. Make sure that each employee knows what a “significant spill” is for each material they use, and what is the appropriate response for “significant” and “insignificant” spills. o Educate employees and subcontractors on potential dangers to humans and the environment from spills and leaks. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. o Hold regular meetings to discuss and reinforce appropriate disposal procedures (incorporate into regular safety meetings). o Have contractor’s superintendent or representative oversee and enforce proper spill prevention and control measures. • General Measures o Store hazardous materials and wastes in covered containers and protect from vandalism. o Train employees in spill prevention and cleanup. o Designate responsible individuals to oversee and enforce control measures. o Spills should be covered and protected from stormwater run-on during rainfall to the extent that it does not compromise cleanup activities. o Do not bury or wash spills with water. o Store and dispose of used clean up materials, contaminated materials, and recovered spill material that is no longer suitable for the intended purpose in conformance with the provisions in applicable BMPs. o Do not allow water used for cleaning and decontamination to enter storm drains or watercourses. Collect and dispose of contaminated water. o Contain water overflow or minor water spillage and do not allow it to discharge into drainage facilities or watercourses. o Place proper storage, cleanup, and spill reporting instructions for hazardous materials stored or used on the project site in an open, conspicuous, and accessible location. o Keep waste storage areas clean, well organized, and equipped with ample cleanup supplies as appropriate for the materials being stored. Perimeter controls, containment structures, covers, and liners should be repaired or replaced as needed to maintain proper function. o Never shall materials be stored in the river or between the tops of the two river banks. o Store materials so they are protected from stormwater and will not migrate into water of the US. • Cleanup o A spill kit is recommended but not mandated once construction activity has commenced and should be located in the Construction office. o All spills must be documents and properly cleaned up. o Clean up leaks and spills immediately o Use a rage for small spills on paved surfaces, a damp mop for general cleanup, and absorbent material for larger spills. If the spilled material is hazardous, then the used cleanup materials may be hazardous and must be disposed of properly. o Never hose down or bury dry material spills. Clean up as much of the material as possible and dispose of properly. • Minor Spills (less than 5 gallons) o Minor spills typically involve quantities of oil, gasoline, paint, etc. which can be controlled by the first responder at the discovery of the spill. o Use absorbent materials on small spills rather than hosing down or burying the spill. o Absorbent materials should be promptly removed and disposed of properly. o Follow the practice below for a minor spill: Contain the spread of the spill. Recover spilled materials. Clean the contaminated area and properly dispose of contaminated materials. o Keep within permitted area. o It must not threaten any stormwater conveyance. AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. • Semi-Significant Spills (greater than 5 gallons but less than the reportable quantity [Table 1]) o Semi-significant spills still can be controlled by the first responder along with the aid of other trained personnel. This response may require the cessation of all other activities. o Spills must be cleaned up immediately: Contain spread of spill. Notify the project foreman immediately. If the spill occurs on paved or impermeable surfaces, clean up using “dry” methods (absorbent materials i.e. oil-dri® and/or rags). Contain the spill by encircling with absorbent materials and do not let the spill spread widely. If the spill occurs in dirt areas, immediately contain the spill by constructing an earthen dike. Dig up and properly dispose of contaminated soil. If the spill occurs during rain, cover spill with tarps or other material to prevent contaminating runoff. • Significant/Hazardous Spills (greater than the reportable quantity [Table 1]) o For significant or hazardous spills that cannot be controlled by personnel in the immediate vicinity, the following steps should be taken: Authorized personnel shall notify the local emergency response by dialing 911. In addition to 911, the contractor will notify the proper county officials. It is the contractor’s responsibility to have all emergency phone numbers at the construction site. For spills of federal reportable quantities (see chart below) authorized personnel shall notify the National Response Center at (800) 424-8802. Secure the area. Notify CDPHE and the Local Municipality immediately and provide written documentation to the State within 5 days. Notification should first be made by telephone ad followed up with a written report. The services of a spill contractor or a Haz-Mat team should be obtained immediately. Construction personnel should not attempt to clean up until the appropriate and qualified staffs have arrived at the job site. Other agencies which may need to be consulted include, but are not limited to, the Fire Department, and the Public Works Department. All employees handling materials are to be educated on spill prevention and response procedures: Spill Prevention: This can be accomplished by using offsite facilities, fueling by trained personnel only, enclosing or covering stored fuel, implementing spill controls, and training employees and subcontractors in proper fueling procedures. Drip Pans should be used whenever possible. Response Procedures: Should any material spill, a down slope berm or other barrier method should be constructed immediately in order to contain the spill. The spill must be immediately cleaned up with an absorbent material. That material should then be bagged, taken offsite and properly disposed of. If the material has absorbed into the soil, then the contaminated soil must be collected in drums or appropriate container, taken offsite and disposed of properly. If a spill does occur, an immediate inspection of the site should be conducted documenting the spill and procedures to be taken to prevent spills from re-occurring. For any spills that are of a reportable quantity, contact the Stormwater Manager, the EPA, and CDPHE AXIS INTERNATIONAL ACADEMY – EROSION CONTROL REPORT SEPT 2025 Colorado Civil Group, Inc. Inspection and Maintenance • Site superintendent or designated personnel will visually inspect and verify that activity based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during rainy periods and of two-week intervals in non-rainy periods to verify continued BMP implementation. • Visually inspect BMPs subject to non-stormwater discharge daily while non-stormwater discharges occur. Table 1. Reportable Quantities of Hazardous Materials Reportable Quantities Material Location of Spill Reportable Quantity Engine oil, fuel, hydraulic & brake fluid Land 25 gallons Engine oil, fuel, hydraulic & brake fluid Water Visible layer, sheen Antifreeze Land ~ 540 gallons (5,000 lbs) Battery Acid Land 13 gallons In case of release that meets or exceeds reportable quantities contact the CDPHE within a 24 hour period. A written report will be required to be filed within 5 days: Recommended On-site Spill Kit • Spill kit should be kept onsite in the trailer (or in an onsite staff vehicle) and its location documents on the SMWP site map. The spill kit is not mandatory however recommended, relevant subcontractors should be prepared and provide their own spill kits if one is not kept onsite. • UN and DOT approved 20-gallon over pack • Compact design with molded grab handles • Source: CMS Environmental Solutions, LLC • Each kit includes: 1 Emergency Response Guidebook, 4 – 3” x 4’ socks, 2 – 9” x 15” pillows, 25 – 15” x 19” pads, 1 pair chemical resistant gloves, 1 pair safety goggles, 2 disposal bags/ties, 1 - 20 gallon Over Pack • Spill kit materials should be refilled if its contents are utilized and depleted in the field. • Inventory the spill kit contents routinely to check for any deplete items. COLORADO CIVIL GROUP, INC. • 2204 Hoffman Drive • Loveland, Colorado 80538 • 970-278-0029