Plan Elements

An Erosion and Stormwater Quality Control Plan shall be developed that consists of a narrative description of the construction project and appropriate plans/maps. The Erosion and Stormwater Quality Control Plan shall consist of the most appropriate or best selection of erosion control practices and sediment trapping facilities in conjunction with an appropriate schedule in order to accomplish adequate control. Adequate erosion control measures shall be constructed prior to land disturbing activities such that no adverse affect of site alternatives will impact the surrounding properties. Particular attention shall be given to concentrated flows of water either to prevent their occurrence or to provide appropriate conveyance devices to prevent erosion. Sediment trapping devices shall be required at all points where sediment laden water might leave the site. The Erosion and Stormwater Quality Control Plan shall include permanent structures for conveying storm runoff, how the site will be graded, final site stabilization, temporary sediment control features including sediment basins and finally, stabilization of the site where temporary features have been removed. Plans showing improvements or construction outside the property line of the site will not be approved unless the plan is accompanied by an appropriate legal easement or written acceptance by the adjacent property owner for the area in which such work is required.

The plan shall be annotated with appropriate standard symbols as shown on the List of Standard Symbols. The symbols should be bold and tend to "stand out" on the plans.

The required plan elements are listed as follows:

Applicant Information

The name, address, telephone number, email address and fax number of the applicant and/or owner and the engineer must be listed on the plan. In addition, it is recommended that the same information be provided for the contractor, if known).

Site Map

The information listed below shall be included on one or multiple site maps. The map shall use one of the following scales; 1"=20', 1"=30', 1"=40', 1"=50' or 1"=100'. The scale selected must be suitable for practical use and readability. The contour interval for these plans shall be 2 feet or closer.

1.

Construction site boundaries.

2.

Areas of soil disturbance.

3.

Areas of cut and fill.

4.

Areas used for the storage of building materials, soils, equipment, fuel, lubricants, chemicals, or waste storage.

5.

Location of any dedicated asphalt or concrete batch plants.

6.

Critical erosion areas and location of major erosion and sediment control facilities or structures.

7.

Existing and proposed water courses including springs, streams, wetlands and other surface waters.

8.

Boundaries of the 100-year flood plains, if determined.

9.

Vicinity map showing relationship of the site to existing and planned roadways, jurisdictional boundaries, and major creeks/streams.

10.

Soil types.

11.

Existing and proposed contours.

12.

Adjacent existing and proposed development affected by the construction.

13.

Other proposed features and structures on the site.

14.

Vegetation.

15.

Property lines for the parcel/lot on which the land disturbance will occur.

16.

Existing and proposed utility locations. The following note shall be added: "The Plan shall not substantially change the depth of cover, or access to utility facilities. Additionally, the Plan shall not increase or divert water towards utility facilities. Any changes to utility facilities to accommodate the plan, must be discussed and agreed to by the affected utility prior to implementing the plan. The resulting cost to relocate or protect utilities, or provide interim access is at the expense of the Plan applicant."

Description of Construction Activities

This includes the nature and purpose of the land disturbing activity.

Timing

The proposed sequence for major construction activities. This includes the anticipated starting and completion time periods of the site grading and/or construction sequence, including installation and removal time periods of erosion and sediment control measures, and the time of exposure of each area prior to completion of temporary erosion and sediment control measures.

Areas

Estimates of the total area of the site and the area of the site that will be cleared, excavated or graded.

Soils Information

A brief description of the soils on the site including information on soil type and names, mapping unit, erodibility, permeability, hydrologic soil group, depth, texture and soil structure. In addition, an estimate of the runoff coefficient of the site before and after construction activities should be included. This information may be obtained from the soil report for the site, or, if available, from soils reports from adjacent sites.

Existing Site Conditions

A description of the existing topography, vegetation, and drainage including a description of any wetlands. This includes a description of the existing vegetation at the site and an estimate of the percent vegetative ground cover. In addition, a description should be included of any anticipated non-stormwater components of offsite discharges such as springs, and landscape irrigation return flows.

Other Pollutant Sources

The location and description of any potential pollutant sources including, but not limited to, vehicle fueling areas, storage of fertilizers or chemicals, etc.

Receiving Waters

The name of the receiving water(s) and the site, type and location of any concentrated flow points from the site. If the discharge is into an existing storm sewer system, this should be stated, along with the name of the ultimate receiving water.

Best Management Practices

The plan shall include a narrative description of appropriate controls and measures that will be implemented before and during construction activities at the facility. It shall clearly describe the relationship between the phases of construction and the implementation and maintenance of control measures. For example, what BMPs will be implemented during each of the following stages of construction:

1.

Clearing and grubbing necessary for perimeter controls.

2.

Initiation of perimeter controls.

3.

Remaining clearing and grubbing.

4.

Road grading.

5.

Drainage facility installation.

6.

Utilities installation.

7.

Final grading.

8.

Stabilization.

9.

Removal of temporary control measures.

The description of controls shall address the following areas:

1.

Erosion and Sediment Control . This includes:

• Structural Practices - A description of structural site management practices that will minimize erosion and sediment transport.

• Non-Structural Practices - A description of interim and permanent stabilization practices, including site-specific scheduling of the implementation of the practices.

2.

Materials Handling . The plan shall identify any procedures of significant materials handled at the site that could contribute pollutants to runoff.

3.

Spill Prevention and Response . Areas where potential spills can occur shall have spill prevention and response procedures identified.

4.

Other Controls . A description of other measures to control pollutants in stormwater discharges including plans for waste disposal.

Detail Drawings

Design drawings of sediment controls, temporary diversions and any practices used that are not referenced in the BMPs or design criteria.

Plans for all Drainage Features

Plans will be submitted for all drainage features including paved areas, retaining walls, cribbing, planting, temporary or permanent soil erosion control measures, or other features to be constructed in connection with, or as a part of, the proposed work.

Final Stabilization and Long-Term Stormwater Management

A description of the measures used to achieve final stabilization and permanent measures to control pollutants in stormwater discharges that will occur after construction operations have been completed.

Final stabilization is reached when all soil disturbing activities at the site have been completed, and uniform vegetative cover has been established with a density of at least 70 percent of pre-disturbance levels and such cover is adequate to control soil erosion, as determined by the City Engineer, or equivalent permanent, physical erosion reduction methods have been employed. The seeded areas shall be kept in good condition at all times until the project is completed. The plan shall include procedures for promptly repairing any damaged areas.

For purposes of this plan, establishment of a vegetative cover capable of providing erosion control equivalent to a density of at least 70 percent of pre-existing conditions at the site and capable of adequately controlling future erosion can be considered final stabilization. The developer will be responsible for providing to the City the documentation to make this comparison. The City may, after consultation with the developer and upon good cause, amend the final stabilization criteria for specific operations. Where possible, coordination of erosion control elements and building schedule will occur so that previously seeded areas are not redisturbed.

Construction Staging and Sequencing

A schedule of anticipated starting and completion dates for each sequence and stage of land-disturbing activities and BMP installation including the expected date on which the final stabilization will be completed. Where possible, the clearing and grubbing operations shall be scheduled and performed so that grading operations and final stabilization can follow immediately.

Owner Inspections

A description of procedures to inspect the vegetation, erosion and sediment control measures, and other protective measures identified in the plan.

For sites where construction has not been completed, the owner/developer or their representative shall make a thorough inspection of their stormwater management system at least every 14 days and after any precipitation or snowmelt event that causes surface erosion. The inspections shall be made during the progress of the work, during work suspension and until final acceptance of the work. The person making these inspections must be certified in a City-approved inspection training program.

1.

The construction site perimeter, disturbed areas and areas used for material storage that are exposed to precipitation shall be inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and sediment control measures identified in the plan shall be observed to ensure that they are operating correctly.

2.

Based on the results of the inspection, the description of potential pollutant sources, and the pollution prevention and control measures that are identified in the plan shall be revised and modified as appropriate as soon as practicable after such inspection. Modification to control measures shall be implemented in a timely manner, but in no case more than seven (7) calendar days after the inspection.

3.

The operator shall keep a record of inspections. Uncontrolled releases of mud or muddy water or measurable quantities of sediment found off the site shall be recorded with a brief explanation as to the measures taken to prevent future releases as well as any measures taken to clean up the sediment that has left the site. Inspection records shall be made available to the City upon request.

The owner/developer shall make a thorough inspection of their stormwater management system at least once every month for sites where all construction activities are completed but final stabilization has not been achieved because planted vegetative cover has not become established. When site conditions make this schedule impractical, the owner/developer may petition the City to grant an alternative inspection schedule. These inspections must be conducted in accordance with the above paragraphs.

Maintenance

A detailed description of the maintenance program for sediment control facilities, including inspection programs, vegetative establishment on exposed soils, method and frequency of removal and disposal of waste materials from control facilities, and disposition of temporary structural measures shall be included. The description shall include a program for continuous maintenance of erosion and sediment control features so that they function properly during construction and work suspensions until the project is accepted by the City.

Soil Borings/Tests and Groundwater

Soil borings and tests, including groundwater analysis and plan for safe discharge must be included if appropriate.

Cost Estimate

A cost estimate shall be provided for all temporary and permanent BMPs, including reasonable costs for replacement and maintenance of BMPs depending on the anticipated length of construction until final stabilization.

Plan Expiration/Resubmittal Requirements

Grading Plans and/or Erosion and Stormwater Quality Control Plans (Plans) expire if construction has not commenced within 12 months of the City Engineer's acceptance of the plan. The plans must be resubmitted for acceptance. Previously accepted Plans must also be resubmitted to the City Engineer for acceptance when any of the following occur: (1) a change in ownership of the property to be disturbed, (2) proposed development changes to the site, or (3) proposed grading revisions.

Signatory Requirements

The Erosion and Stormwater Quality Control Plan is to be signed and sealed by a Colorado Registered Engineer and to be signed by the Owner with a statement that "The Owner will comply with the requirements of the Erosion and Stormwater Quality Control Plan." This statement may be modified if a combined Grading, Erosion and Stormwater Quality Control Plan is submitted. The following Owner statement shall also be included on all Grading and/or Erosion and Stormwater Quality Control Plans: "I acknowledge the responsibility to determine whether the construction activities on these plans require Colorado Discharge Permit System (CDPS) permitting for Stormwater Discharges associated with Construction Activity."