This manual is an adaptation of the Southeast Metro Stormwater Authority’s Grading, Erosion and Sediment Control Manual. The City of Glendale (the City) appreciates the time, effort, and expertise that went into the 2018 rewrite of the GESC Manual, as well as the previous version.

DESIGN

The City will review the Grading Erosion and Sediment (GESC) Control Plans and Report (GESC Plans) submittals for general compliance with the criteria contained herein. An acceptance of submitted documents by the City does not relieve the Owner’s Design Engineer or eventual Permittee(s) of responsibility for ensuring that calculations, plans, specifications, and construction comply with the

criteria contained herein. Additionally, acceptance by the City does not alleviate the Design Engineer or Permittee(s) from complying with all other applicable Federal, State, or Local regulations.

GESC Plans are also known as construction stormwater site plans, site plans, sediment and erosion control plans, stormwater pollution prevention plans, and stormwater management plans. Unless otherwise specified. GESC Plans include GESC Drawings and the GESC Report.

The Permittee must update the GESC Plan as necessary to reflect site conditions. There are two types of GESC Plan modifications: major and minor. Major modifications require submittal to the City for review and approval. Minor modifications do not require re-review and approval but must be implemented immediately and recorded on the GESC Plan.

 Major Modifications 

Major modifications to a GESC Plan, are those involving re-engineering or changes to site hydrology (e.g. increased area tributary to a Control Measure; site conditions beyond the limits of a Control Measure; eliminating a Control Measure; changes to grading, drainage, or design intent). Major modifications must be submitted to the City for review and acceptance. Control Measures that may be classified as a major modification are indicated with a “box” surrounding the Control Measure acronym (use the SEMSWA Standard Notes and Details legend).

 Minor Modifications 

The City allows minor GESC Plan modifications without re-review and approval. All minor modifications shall be implemented immediately and recorded on the GESC Plan. The City expects that the Permittee will need to make minor GESC modifications throughout a project to address changes in site conditions. Minor GESC modifications generally include Control Measure substitutions for other measures that are equivalent in performance and/or are more suitable to specific site conditions.

PERMIT REQUIREMENTS FOR SPECIFIC SITE TYPES

While the City only issues one type of Stormwater Permit, projects over an acre, or less than an acre, but part of a larger common plan of development, have different requirements than projects less than an acre and not part of a common plan of development.

Over an Acre or Part of a Larger Common Plan of Development

Projects over an acre of disturbance, or under an acre of disturbance, but part of a larger plan of a development must prepare and submit GESC Plans and proof of a state-approved permit to the City. The GESC Plans must conform to these requirements. Submittals must include the checklist found in Appendix A - GESC Plan Review Checklist. These projects must also install and maintain

 Control Measures (CMs) per the GESC Plans and these Requirement and must perform weekly inspections.

 The following requirements shall be adhered to when preparing a GESC Plans. The GESC Plan requirements are explained in this Section. The GESC Plan Review Checklists located in Appendix A - GESC Plan Review Checklist should be filled out and submitted as an attachment to the GESC Plans, to ensure that each of the requirements is addressed. All Standard GESC Permit Plans shall be prepared on 24” by 36” sheets at a scale of 1-inch to 20-feet up to 1-inch to 200-feet, as appropriate, to clearly show enough detail for review.

 INITIAL GESC CONTROL MEASURES  

This plan sheet shall provide grading, erosion, sediment, and waste controls for the initial clearing, grubbing and grading of a project. These initial control measures shall be installed at the outset of construction, prior to the Preconstruction Meeting and after plan approval. This will ensure that the control measures will be installed prior to any other land-disturbing activities.

Initial controls are to be placed on existing grades, but shall be based, as appropriate, on proposed grading operations.

INTERIM GESC CONTROL MEASURES  

This plan sheet shows control measures to control grading, erosion, sediment and waste during the grading, site construction, and site re-vegetation process. These control measures shall be based on proposed grades and drainage features, are installed after initial site grading, and as soon as practicable. Some interim controls are installed after construction of site infrastructure (e.g. Inlet Protection Control Measure after inlet construction).

 FINAL GESC CONTROL MEASURES  

This plan sheet shows controls for completion of the site through the final stabilization phase. Control measures shown in the Final Stabilization GESC Plan shall be installed as one of the last steps in the construction process, such as the final seeding and mulching stabilization control measure.

 STANDARD NOTES AND DETAILS  

A copy of the GESC Plan Standard Notes and Details must be included with each set of GESC Plans. The Standard Notes can be found in Appendix B – Standard Notes and Details. For Standard Details, either the SEMSWA Details or the UDFCD Construction Details can be used. Upon approval by the City, equivalent control measures details maybe approved for use and must be included with the Standard Notes and Details. This is to make sure the Contractor has all the relevant details provided within the site Stormwater Permit documents.

 SIMPLIFIED PLAN REQUIREMENT 

The City may allow less complex projects to combine the Initial and Interim GESC sheets.

Under an Acre and Not a Common Plan of Development

Projects under an acre of disturbance and not part of a larger plan of a development must include GESC Plans in the plan submittal that conform to these requirements. Submittals must include the checklist found in Appendix A. The Initial and Interim sheets may be combined with City approval.

 These projects must also install and maintain BMPs per the GESC Plans and these requirements and must still perform regular inspections.

Low Risk Projects

Some land disturbing activities less than one acre are not expected to contribute sediment to the stormwater system. These projects have a very low potential of causing a water quality impact and/or a violation of a water quality standard and are identified as “Low Risk.” The City does not issue a permit for construction activities that are considered low risk.

Low Risk sites must submit a description of the proposed activities and a sketch of the work to be performed. The City will determine if it qualifies as Low Risk.

 Low Risk construction activities are generally typical of construction activities a homeowner or handyman service would undertake. Some smaller commercial construction incidental activities may also be considered Low Risk, such as re-skinning a building. The land disturbance is small, and significantly less than one acre; not part of a larger common plan of development. The activity is typically a one-time project, short in duration, condensed to one activity, and would not have the potential to affect established drainage patterns. The City has determined that Low Risk sites can be managed without a formal permit if control measures are implemented and maintained.

CONSISTENCY WITH OTHER PLANS

The GESC Plan shall be consistent with approved plans such as drainage reports and construction drawings. The GESC Plan shall be submitted along with other related City plans and permit applications. The Applicant may be required to obtain other permit types as part of the project development permitting process. The Applicant should verify plans and permits required from the City specific to their development.

VARIANCES

VARIANCE CRITERIA

A variance shall be granted only upon the finding that the requested variance from the

requirements of the City of Glendale’s Stormwater Construction Program (SCP) will not impair the public health, safety, and welfare of the residents of the City and that the intent and purposes of the SCP have been met. In ruling upon a variance, the City shall also consider the impacts the proposed alternative criteria would have on construction and maintenance requirements and cost.

VARIANCE AND APPEAL PROCEDURES

Step 1. Applicant submits a written request for a variance from the SCP to the City Public Works. At a minimum, the variance request must include the following information:

1. Identification of the criteria sought to be waived or varied;
2. Identification and detailed description of the alternative to the SCP requirements;
3. How the variance still meets the MS4 permit requirements; and
4. Justification of the variance request.

Step 2. The City is responsible for reviewing the variance request and deciding approval or denial. If the requested variance impacts other departments, the applicable department will be consulted.

Step 3. Upon the determination of a variance request, the City will notify the Applicant of the determination

Stormwater Permitting

State Permit

The State of Colorado requires separate, additional permits for construction-related activities. The Applicant or the Designer shall contact the Colorado Department of Public Health and Environment, Water Quality Control Division (WQCD) for specific State permitting information for specific projects. Contact information for the WQCD is provided in Appendix F – Additional Resources. In compliance with the CDPS Stormwater Permit Program, the State requires that construction projects exceeding one (1) acre of disturbance must obtain a State Stormwater Construction Permit and develop a Stormwater Management Plan (SWMP).

In order to receive a City Stormwater Permit the applicant must provide a copy of the Stormwater Permit Certification or CDPHE WQDV Waiver.

City of Glendale Stormwater Permits are required for projects meeting the SCP Requirements, even if a Federal or State agency, or another jurisdiction, has approved the project and issued their permit(s) for the work. The GESC Plans are specific to the City of Glendale Construction Requirements and Program (SCP).

City of Glendale Stormwater Permit

Signed GESC Plan and Report Required Prior to Permit

The GESC Plan documents will be considered accepted when a completed application and submitted copies of the GESC Plan and Report is approved. Applicants will be notified by the City when the GESC Plans have been signed and are ready to be picked up. The City will retain three sets of signed GESC Plans, two with 24” by 36”GESC Plan Drawings and one with 11”x17” GESC Plan Drawings.

Review and Permit Fees

Review fees are submitted with the initial GESC Permit submittal package. Review fees are based on area of land disturbance.

Permit Fees are to be paid prior to the GESC Permit issuance.

Who Obtains a City of Glendale Stormwater Permit

Stormwater Permits are signed by both the Project Owner and the Contractor. Prior to issuance of a Stormwater Permit, the Owner and the Contractor are referred to as “Applicants.” After the Permit is issued, both are considered “Permittees” and must comply with the Stormwater Permitting requirements. The specific contractual relationship between the Owner and Contractor as the Permittees must allow for immediate correction of deficiencies. A Permittee is defined as “any person(s) who is issued a Stormwater Permit by the City." The Permittee shall be legally responsible for compliance with the Stormwater Permit. If the Applicant is not an individual, an authorized agent of the entity must sign the permit on behalf of the Permittee.

Permittees conducting land-disturbing activities are responsible for meeting all requirements of the SCP that are described in these Requirements. Failure to meet the requirements of the Stormwater Permit may lead to enforcement action (See Section 4, Enforcement).

During Construction Requirements

City Inspections

Pre-Construction Meeting or Initial Inspection

An onsite Preconstruction Meeting or Initial Inspection is required prior to the Stormwater Permit issuance so that the City Inspector can verify that initial sediment, erosion, and waste control measures are in place and the site is ready for construction activity. Once verified, the Stormwater Permit application can be approved and the Permit issued (pending all other applicable City permits). The City Inspector and the Stormwater Manager are required to attend the pre-construction meeting. The following representatives are highly encouraged to attend:

• General Contractor.
• Owner or Owner’s Representative (the General Contractor may NOT be the owner’s representative).
• Alternate GESC Manager (may be the same as the Owner or General Contractor Representative).
• Grading Sub-Contractor, if different than the General Contractor.

If the City Inspector determines that significant modifications or corrections to the initial GESC control measures are necessary, the City Inspector will inform the Stormwater Manager that such corrections shall be made, and that a follow-up inspection shall be scheduled with the City. At no time can construction activities be initiated until appropriate control measures are in place. Acceptance of the corrected control measures by the City Inspector shall take place prior to the issuance of the Stormwater Permit. The Permittee shall not start site grading activities prior to the Stormwater Permit issuance.

No work is allowed on site other than the installation of the Initial BMPs shown on the GESC Plan until the executed permit is issued and on site. Failure to restrict additional activities can result in a stop work order.

Routine Inspections

The City will perform routine inspections. The Stormwater Manager or the Alternate Stormwater Manager are encouraged to attend and one of them must be available within 24

hours of contact by the City. In the event the GESC Manager (or Alternate GESC Manager) cannot be reached within 24 hours, and a GESC issue is urgent, a violation may be assed.

A typical routine inspection will entail visual examinations of site conditions, construction activities, work practices, and CMs. These CMs may be structural, physically installed features (structural CMs) or administrative/procedural activities that are part of the Operator’s work practices and procedures (non‐structural CMs). The Stormwater Inspector reviews installed CMs for correct application, correct installation, adequacy, and maintenance.

Compliance Inspections

A compliance inspection occurs any time an inspection documents an illicit discharge or identifies a failure to implement a CM, an inadequate control measure, or per the Inspector’s discretion. The compliance inspection is used to verify that the corrections leading to the compliance inspection have been completed. At the City Inspector’s discretion, the Stormwater Manager may be allowed to inspect and report that the corrections have taken place. The operator must include photographs of the new/adequate control measures and must document the date, the name of the Operator inspector, site identification, and inspection results, including photos of the new or additional control measures used to address the previous inspection findings.

Unresolved findings, findings of a severe nature, and chronic/recalcitrance may result in enforcement actions. An action the City takes against the party in non-compliance is based on the nature and severity of the situation and in accordance with the City’s Stormwater Ordinance. The City uses professional judgment and enforcement discretion to determine the appropriate level of compliance assistance and enforcement actions in a given situation. See

Section 4, Enforcement, for additional information on Enforcement Actions resulting from non- compliance.

Inspections Resulting in Non-Compliance 

Site conditions that constitute non‐compliance may include, but are not limited to:

1. Working without a Stormwater Permit.
2. CMs that are not installed according to the approved GESC Plan.
3. CMs not installed correctly, or not implemented correctly.
4. Neglected CMs, or CMs in need of significant maintenance or replacement.
5. Portable toilets that are improperly stationed on paved surfaces, at curb flow lines, or are not anchored properly.
6. Evidence of liquid waste or washouts discharged directly onto the ground without containment.
7. Concrete washout area that is near failure, not installed or signed properly.
8. Fuel leaks/spills that have not been properly remediated.
9. Inadequate vehicle tracking control measures to prevent sediment tracking onto paved sections.
10. Vehicle tracking onto City streets, roads or paved areas.
11. Repeated neglect and/or findings from previous reports that have not been adequately addressed.

Final Close-Out Inspection

Prior to scheduling the Final Close out inspection, the permittee must ensure that the site is final stabilized and the required coverage of 70% of the pre-construction condition has been achieved, and that noxious weeds have been controlled. When the required coverage has been met, the City Inspector will verify coverage.

After receiving a City inspection documenting final stabilization, the remaining final stabilization control measures shall be removed and disposed of properly. The site shall be cleaned up and any areas disturbed as a result of control measure removal shall be seeded and mulched, or otherwise final stabilized.

Prior to Final Close-Out inspection the following must be done:

• Clean all streets, sidewalks and flowlines of sediment with a street sweeper. WASHING OF STREETS, SIDEWALKS AND FLOWLINES IS IN DIRECT VIOLATION OF CITY CODE.
• Clean all inlets, trickle channels and all other drainage features.
• Remove all controls at the site.
• Maintain all stormwater infrastructure to ensure proper functionality of the stormwater system.

The Final Close-out Inspection shall then be scheduled between the City and the Permittee. The City Inspector will check the removal of control measures, confirm that the final stabilization vegetation has been maintained as appropriate, and either accept the site as final, or stipulate the corrections that must be made. In instances when corrections are substantial, the City Inspector may require that follow-up inspections be scheduled with City until the site is final stabilized.

Permittee Required Inspections

The permittee’s Stormwater Manager or designated alternate shall perform weekly inspections of the site, CMs, and the area surrounding the site. The permittee shall update the GESC Plan as necessary, based on the inspections. These inspections shall be performed at a minimum of once per week, documented, and submitted to the Public Works Director or their designee.

1. The inspection document must include the inspection date, inspector’s name, CM description and any corrective actions needed and/or taken. These documents must be kept on file at the construction site, and submitted to the city within one (1) week of the inspection being conducted.
2. Inspections shall occur for the life of the project until a notice of termination is submitted to CDPHE and the site is stabilized.
3. Appropriate control measures must be implemented prior to the start of construction activity, must control potential pollutants during each phase of construction, and must be continued through final stabilization. Appropriate structural control measures must be maintained in operational condition.
4. CMs must be inspected to ensure they are installed and maintained per the applicable standard.

Inspections shall include erosion, sediment, and waste controls to ensure that the control measures are adequately installed, maintained and functioning as intended.

Additionally, upon request the Stormwater Manager must be available for all City Inspection, as described below in Section 3.3 - Stormwater Manager Requirements.

Stormwater Manager Requirements

As the Permittee's focus shifts from preparing the GESC Plan and Report and applying for the Stormwater Permit, to constructing the project, the first task is to select a site Stormwater Manager. The Stormwater Manager is the Permittee contact person with the City for all matters pertaining to the GESC Plan and Stormwater Permit and shall respond to requests made by City staff and have any deficiencies in the work corrected. The Stormwater Manager may be an employee of the Owner or Contractor and shall have the authority to act on behalf of the Permittee, including committing funds, to ensure that the site remains in compliance with the Stormwater Permit. In all matters, the Permittee shall remain the legally responsible party. An Alternate Stormwater Manager who can serve in the same capacity as the Stormwater Manager shall also be selected.

1. The Stormwater Manager shall be on site as necessary to ensure these Requirements are being implemented.
2. The Stormwater Manager shall inform the Alternate Stormwater Manager of any absences, provide the Alternate the status of the GESC Plan implementation, and ensure that the Alternate Stormwater Manager assumes the Stormwater Manager’s responsibilities during any absence.
3. The Stormwater Manager and Alternate Stormwater Manager shall be named at the onsite Preconstruction Meeting and shall provide the City with a contact number. The contact number will ensure that the Stormwater Manager can be contacted and provide adequate communication about the site.
4. Notification shall be provided to the City if the Stormwater Manager or Alternate change. A field meeting with the City Inspector and the new Stormwater Manager or Alternate should be scheduled prior to the next scheduled inspection to discuss site conditions and responsibilities of the Stormwater Manager.
5. In the event the Stormwater Manager (or Alternate Stormwater Manager) cannot be reached within 24 hours, and a Stormwater issue is urgent, a violation may be assessed.
6. The Stormwater Manager is required to submit all inspections to the City as described in Section, Permitee Required Inspections.

7. At the City Inspectors request, the Stormwater Manager and/or Alternate must provide a copy of the approved GESC Plan, GESC Plan - Standard Notes and Details, and Stormwater Permit.

GESC Plan Requirements

During construction, the Operator is responsible ensuring proper installation, operation of CMs and is responsible for making their own determination as to the adequacy and locations of CM types (see Section 5 – Control Measure Requirements and Section 6 – Design, Installation, and Maintenance of Control Measures for more details). The Operator shall amend the GESC Plan as changes are made (See Section 1 for GESC Plan Modification Requirements).

Construction Requirements

The Permittee is responsible for ensuring proper installation, operation, and maintenance of CMs. They must ensure appropriate CMs are in place prior to the start of the construction and that appropriate CMs are continued through final stabilization. The CMs must reduce or prevent the

discharge of pollutant from entering the MS4 from the project’s construction activities. Section 5 – Control Measure Requirements and Section 6 – Design, Installation, and Maintenance of Control Measures provides further detail on the City’s CM Requirements and Construction Practices.

Enforcement

Per Chapter 13.30.050 Noncompliance Remedies of the Municipal Code:

Whenever the city determines that any activity is occurring which is not in compliance with a storm water quality permit and/or the requirements of this chapter, the city may issue a verbal warning, a written compliance order to an individual, property owner or permittee containing a compliance schedule, a stop work order, and/or re-inspection fees. The schedule shall contain specific actions the person must complete, including dates for the completion of the actions. It shall be unlawful for any person to fail to comply with any compliance order requirement.

The city may, according to the powers granted to it by C.R.S. 30-15-401, at its discretion, proceed against any violation of this title by abatement, injunction, or other civil action, which remedies shall be cumulative to the penalties in Section 1.16.010, and/or C.R.S. 18-4-511. No remedy provided in this chapter shall be exclusive. All remedies shall be cumulative and available concurrently. The taking of any action authorized by this chapter, including charge or conviction of violation of this chapter, shall not preclude or prevent the taking of other action to abate any violation. (Ord. 2017-1 § 1 (part): Ord. 2011-5 § 1 (part): Ord. 2005-2 § 1 (part))

Failure to comply with any term, condition, limit, deadline or other provision of the SCP, the Stormwater Permit, or failure to obtain a Stormwater Permit or keep an active Stormwater Permit or GESC Plan, shall constitute a violation of these Requirements and the City Code. Discharge of any pollutant offsite, including sediment, is a violation and subject to enforcement. In addition to any other legal or equitable remedies that the City may have for Stormwater violations, the City may at its discretion use any of, but not limited to, the following enforcement: verbal warnings with education; issue compliance assistance re-inspection fees; withhold issuance or extensions of permits; withhold all City inspections; issue Notice of Violation; issue Stop Work Order; revoke permit(s); conduct abatement; or refuse to issue any other necessary approvals until such violation has been corrected and the Permittee has taken the necessary action to ensure compliance with the Stormwater Permit and these Requirements.

Control Measure Requirements and Construction Practices

Appropriate control measures must be in place prior to the start of the construction activity and must be continued through final stabilization. Control measures must be maintained in operational condition.

Several of the City’s requirements pertaining to general construction practices and general control measure requirements are highlighted in the following sections. Noncompliance with these construction practices is not acceptable, will be a violation of the Stormwater Permit, and can be enforced upon by the City Inspector.

Standard Notes and Details

The Permittee and Contractor working in the City have the responsibility to review, understand, and comply with the GESC Plan Standard Notes and Details. The Standard Notes must be those provided in Appendix B, Standard Notes and Details. The Standard Details may be either the SEMSWA Standard Details or UDFCD Construction BMP Details.

Stabilization

All areas disturbed by construction, and soil stockpiles, shall be stabilized as soon as possible to reduce the duration of soil exposure to runoff events and the potential for erosion. All disturbed areas which are either final graded or will remain inactive for a period of more than thirty (30) days, shall be required to be stabilized within fourteen (14) days of the completion of the grading activities. Reworking the disturbed area within the thirty (30) days for the sole purpose of avoiding the requirement to stabilize the exposed area shall not be considered an acceptable practice.

Acceptable stabilization control measures are as follows.

• Surface Roughening and Mulching,
• Seeding and Mulching (acceptable if area will remain dormant for more than six (6) months; temporary seed mix is acceptable),
• Landscaped, or
• Erosion Control Blanket.

All stabilization measures must be maintained.

Installation of Interim and Final Control Measures

It is the responsibility of the Stormwater Manager to ensure that Interim control measures and subsequent Final control measures are installed at the earliest opportunity. Some control measures have specific time requirements for installation that are identified on the GESC Plan - Standard Notes and Details; these time requirements shall be adhered to. For control measures where a specific time frame is not given, the controls shall be installed as soon as construction of the infrastructure is substantially complete or when grading activities have produced grades close to the final grade.

Slopes

Preferred slopes are 4:1 or flatter, designed with variation and shaping as appropriate. Slopes between 3:1 and 4:1 require stabilization with Erosion Control Blanket. Slopes steeper than 3:1 are highly discouraged.

Stockpiles

During design, earthwork balance and timing of construction will determine the necessity of stockpiling. If stockpiling is anticipated, it must be noted on the GESC Plan, and must be within approved construction limits.

Stockpile types and locations may be reviewed and approved by the City Inspector. The following criteria apply to all stockpiles:

• Side slopes of stockpiles not being actively worked must be flatter than 3:1. Appropriate control measures to control erosion of the slopes must be used.
• Soils that will be stockpiled for more than 30-days and not actively worked, shall be protected from erosion within 14-days of stockpiling. Stabilization and protection of the stockpile may be accomplished by any of the following: mulching, temporary/permanent revegetation, chemical soil stabilizer application (requires City approval), or erosion control matting/geotextiles.
• If stockpiles are located within 100 feet of receiving waters additional CMs will be required.
•  If material is removed from the stockpile periodically throughout the life of the stockpile, appropriate control measures must be provided to address the disturbance caused by the removal operations.

No work, storage of equipment, or stockpiling, shall be allowed outside of the approved Limits of Construction. The Limits of Construction must be complied with and are enforceable by the City Inspector.

Limits of Construction

No work, storage of equipment, or stockpiling, shall be allowed outside of the approved Limits of Construction. The Limits of Construction must be complied with, and are enforceable by the City Inspector.

Street Cleaning

Throughout the life of a project, streets used for egress shall be kept clean and free of sediment that can be tracked. In the event of accidental tracking of mud or dirt on streets, the mud and/or dirt shall be cleaned immediately using a vacuum-type street sweeper, a brush-type street sweeper with dust control, or manually using shovels and brooms. Any damage to the street from mechanical methods of street cleaning shall be repaired at the Permittee expense. Streets can only be cleaned with water if all wash water is captured and prevented from entering the storm sewer system.

Tracking of sediment from a construction site is not acceptable, is a violation of the Stormwater Permit, and can be enforced by the City Inspector.

Dust Control

The Stormwater Manager shall be responsible for dust control on the site. Disturbed areas not yet ready to be seeded, landscaped, paved, or otherwise stabilized, shall be watered, sprayed with a tackifier, mulched (without seed) or ripped as necessary to preclude visible dust emissions. Dust that leaves the site in any amount that can be considered a safety issue is not acceptable, is a violation of the Stormwater Permit, and can be enforced upon.

Construction Site Waste Control

Many potential pollutants other than sediment are associated with construction site activities. These pollutants include, but are not limited to, pesticides; fertilizers used for vegetative stabilization; petrochemicals; construction chemicals such as concrete products, sealers, and paints; wash water associated with these products; trash; paper; wood; garbage; detergents and solvents; and sanitary wastes. These wastes are described below in Section, Potential Pollutants.

Responsible handling and adequate disposal facilities shall be utilized for solid waste, including excess asphalt, concrete, wood, rebar and other construction wastes produced during construction. Washing of equipment and machinery shall not be allowed on site, is a violation of the Stormwater Permit, and can be enforced upon.

Appropriately store, cover, and/or isolate all onsite potential construction-associated waste pollutants to prevent runoff of pollutants and contamination of ground water. The Stormwater Manager is responsible for both the management and cleanup of potential construction waste. Outdoor storage of bulk liquids is required to have secondary containment or equivalent protective measures in place. Outdoor storage or any of the above items shall not be stored within the floodplain, and is a violation of the Stormwater Permit, and can be enforced upon.

Sediments are soils or other surficial materials transported or deposited by the action of wind, water, ice, or gravity, and often as a product of erosion. Sediments from construction sites can erode from land disturbed by the construction activities during a rainfall event.

Potential Pollutants

Pollutant sources onsite must be identified and controlled using structural and/or non-structural CMs. Detailed descriptions of structural control measures for pollution control are referenced in Section 6, Design, Installation, and Maintenance of Control Measures. Though not an exhaustive list, the following are examples of common pollutant sources found on construction sites. Failure to control any of these pollutant sources, or other potential pollutants is unacceptable, is a violation of the Stormwater Permit, and can be enforced by the City Inspector.

Pesticides

Insecticides, fungicides, rodenticides, and herbicides are used on construction sites to reduce maintenance and fire hazards associated with weeds and woody plants. Rodenticides are also used to control rodents attracted to construction sites. Common insecticides employed include synthetic, relatively water-insoluble chlorinated hydrocarbons, organophosphates, carbamates, and pyrethrins.

Petroleum Products

Petroleum products used during construction activities include fuels and lubricants for vehicles, for power tools, and for general equipment maintenance. Specific petroleum pollutants include gasoline, diesel oil, kerosene, lubricating oils, and grease. Asphalt paving also can be particularly harmful since it releases various oils for a considerable time after application. Additionally, many of these pollutants adhere to soil particles that can leave the site in runoff and pollute receiving waters.

Nutrients

Fertilizers are used on construction sites when re-vegetating graded disturbed areas. Fertilizers contain nitrogen and phosphorus, which in large doses can adversely affect surface waters, causing eutrophication.

Solid Wastes

Solid wastes on construction sites are generated from trees and shrubs removed during land clearing and structure installation. Other wastes include wood and paper from packaging and building materials, scrap metals, sanitary wastes, rubber, plastic and glass, and masonry and asphalt products. Common trash, including food containers, cigarette packages, leftover food, and aluminum foil also contribute to solid wastes at the construction site.

Construction Chemicals

Chemical pollutants, such as paints, acids for cleaning masonry surfaces, cleaning solvents, asphalt products, soil additives used for stabilization, sanitary wastes, and concrete curing compounds, may also be used on construction sites and carried in runoff.

Sediment

 Sediments are soils or other surficial materials transported or deposited by the action of wind, water, ice, or gravity, and often as a product of erosion. Sediments from construction sites can erode from land disturbed by the construction activities during a rainfall event.

Equipment Maintenance

Equipment maintenance is to be conducted in the designated location within the Limits of Construction. Maintenance should not be conducted within 50 feet of a conveyance swale, drainage way, and/or storm sewer inlets.

Spills and Leaks

Spills and leaks onsite must be cleaned up using dry methods whenever possible. If water or other liquid methods are used, the wash water must be collected and disposed of properly. Spilled substances and any associated cleaning residue must be prevented from reaching receiving waters and/or entering the storm sewer system. Effective spill control is required to be implemented on construction sites. Onsite personnel must be trained on both spill prevention and spill response measures.

Design, Installation, and Maintenance of Control Measures

This section references several temporary control measures accepted for use in the City to control erosion and sediment runoff from construction sites. The temporary control measures referred to provide the design parameters to be specified for each control measure on the GESC Plan and the accompanying GESC Plan – Standard Notes and Details, criteria for sizing control measures, and required maintenance for each control measure.

The GESC Plan submitted to the City for approval and subsequently provided to the Contractor with the final construction drawings shall include a set of the GESC Plan - Standard Notes and Details. If there is a conflict between the design, installation, and/or maintenance of a control measure in the GESC Manual and the Standard Notes and Details, the City Inspector will work with the contractor to determine the appropriate reference to use. See Appendix B, Standard Notes and Details.

Appropriate control measures must be in place prior to the start of the construction activity and must be continued through final stabilization. Control measures must be maintained in operational condition.

Additionally, control measure must reduce or prevent the discharge of pollutants from entering to the MS4 from the project’s construction activities.

The City recognizes that there will be new advances in the development of erosion and sediment control measures that may prove effective, or even out-perform controls currently accepted. The City may allow the installation of alternative erosion and sediment control measures other than the GESC Plan Standard Notes and Details. If alternative erosion and sediment control measures will be used, a cut sheet must be submitted to the City Inspector. The City reserves the right to reject any control measure proposed or conditionally implemented. If the control measure does not perform with sufficient effectiveness, it would be considered a failed control measure by the City. In the case of a failed alternate control measure, one or more of the referenced temporary standard control measures shall replace the failed

control measure, at the Permittee’s expense.

The temporary control measures accepted for use in the City are the SEMSWA Standard Control Measures and the Urban Drainage and Flood Control Construction BMPs. Information on Design,

 Selection, Installation, and Maintenance of these Control Measures/Best Management Practices can be found at the following sites in the cited sections:

SEMSWA GESC Manual:

Section 11 – Design, Installation, and Maintenance of Control Measures Appendix F: GESC Plan Standard Notes and Details

UDFCD Criteria Manual: Volume 3 Chapter 7 – Construction BMPs

Program Requirement History and Overview

These City of Glendale (the City) Construction Stormwater Requirements (Requirements) describe the requirements implemented by the City to promote environmentally sound construction practices in the City and to comply with State and Federal requirements. The development, implementation, and enforcement of the City of Glendale’s Stormwater Construction Program (SCP) is mandated by both the Federal Government and the State of Colorado (State). The Federal Clean Water Act’s National Pollutant Discharge Elimination System (NPDES) Stormwater Regulations require that stormwater discharges from certain types of facilities be authorized under discharge permits (40 C.F.R., 122.26).

The State of Colorado has assumed the responsibility to authorize these discharges under the Colorado Discharge Permit System (CDPS) and has enacted Regulation 61 of the Colorado Water Quality Control Act (CWQCA) as the regulatory requirement. The City, as a municipality, has been classified by the State as a Municipal Separate Storm Sewer System (MS4).

The goal of the SCP is to reduce erosion and sedimentation over pre-development conditions by implementing effective erosion and sediment control measures or BMPs (Best Management Practices) for land disturbance activities. During the relatively short period of time when undeveloped land is converted to urban uses or developed land is redeveloped, a significant amount of sediment can erode from a construction site and be transported to adjacent properties and receiving waters. Erosion caused by land disturbing activities, and the resulting downstream sedimentation, can damage property and degrade the quality of streams and lakes. Sediment is a transport mechanism for many stormwater pollutants. Eroded sediment can impact riparian and aquatic habitat and, since eroded sediments often contain significant phosphorus, this can lead to unwanted algae growth in lakes and reservoirs. The City is committed to protecting water resources and ensuring that future development continues in an environmentally sound manner.

The Colorado Water Quality Control Act (CCR 61.8(11) (a) (ii) (D)) requires the City to:

...develop, implement, and enforce a program to reduce pollutants in any storm water runoff to the MS4 from construction activities that result in a land disturbance of greater than or equal to one acre. Reduction of pollutants in stormwater discharges from construction activity disturbing less than one acre must be included in the program if that construction activity is part of a larger common plan of development or sale that would disturb one acre or more. The program must be developed and implemented to assure adequate design, implementation, and maintenance of control measures at construction sites within the MS4 [the City] to reduce pollutant discharges and protect water quality. The program must include the development and implementation of, at a minimum:

• An ordinance or other regulatory mechanism to require erosion and sediment controls, as well as sanctions to ensure compliance, to the extent allowable under State or local law;
• Requirements for construction site operators to implement appropriate erosion and sediment controls;
• Requirements for construction site operators to control waste such as discarded building materials, concrete truck washout, chemicals, litter, and sanitary waste at the construction site that may cause adverse impacts to water quality;
• Procedures for site plan review which incorporate consideration of potential water quality impacts;
• Procedures for receipt and consideration of information submitted by the public; and
• Procedures for site inspection and enforcement of control measures. The SCP complies with these requirements.

Regulatory Interpretation

In the interpretation and application of the provisions of these Requirements, the following shall govern: These provisions shall be regarded as the minimum requirements for the protection of the public health, safety, comfort, convenience, prosperity, and welfare of the residents of the City.

These Requirements shall, therefore, be regarded as remedial and shall be liberally construed to further its underlying purposes. Whenever a provision in these criteria or any provision in any law, ordinance, resolution, rule or regulation of any kind, contain restrictions covering same subject matter, whichever is more restrictive or imposes higher standards shall govern.

State Requirements

Applicants are also responsible for complying with all State requirements, including, but not limited to obtaining a State Stormwater Discharge Permit. Other requirements may include, but are not

limited to “Discharges Associated with Construction Activities” to manage dewatering discharges from construction projects. The permit establishes water quality standards and control measures for dewatering discharges.

Federal Permits and Requirements

Applicants are also responsible for complying with all applicable Federal permits and requirements. This may include, but is not limited to, the Federal Emergency Management Agency (FEMA) map revision process, the United States Army Corps of Engineers (Corps) Section 404 Permit and the United States Fish and Wildlife Service, Endangered Species Act Section 10 and/or Section 7 Permits.

Definitions

City of Glendale’s Stormwater Construction Program (SCP) – The stormwater construction program implemented by the City to meet the requirements of the City’s MS4 permit requirements.

City of Glendale’s Stormwater Construction Requirements (Requirements) – this document, which outlines City of Glendale requirements and processes, particularly those that aid compliance with the City of Glendale Municipal Code and MS4 Requirements.

Common Plan of Development or Sale - A contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules, but remain related.

 The Division has determined that “contiguous” means construction activities located in close proximity to each other (within ¼ mile). Construction activities are considered to be “related” if they share the same development plan, builder or contractor, equipment, storage areas, etc. “Common plan of development or sale” includes construction activities that are associated with the construction of field wide oil and gas permits for facilities that are related.

Construction Activity - Ground surface disturbing and associated activities (land disturbance), which include, but are not limited to, clearing, grading, excavation, demolition, installation of new or improved haul roads and access roads, staging areas, stockpiling of fill materials, and borrow areas. Construction does not include routine maintenance to maintain the original line and grade, hydraulic capacity, or original purpose of the facility. Activities to conduct repairs that are not part of routine maintenance or for replacement are construction activities and are not routine maintenance. Repaving activities where underlying and/or surrounding soil is exposed as part of the repaving operation are considered construction activities. Construction activity is from initial ground breaking to final stabilization regardless of ownership of the construction activities.

Best Management Practices - Schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of "state surface waters". BMPs also include treatment requirements, operating procedures and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. For the purpose of this document, the term BMP interchangeable with the term control measure, and can include other methods such as the installation, operation, and maintenance of structural controls and treatment devices.

Control Measure (CM) - Any best management practice or other method used to prevent or reduce the discharge of pollutants to state waters. Control measures include, but are not limited to, best management practices. Control measures can include other methods such as the installation, operation, and maintenance of structural controls and treatment devices.

Final Stabilization - The condition reached when all ground surface disturbing activities at the site have been completed, and for all areas of ground surface disturbing activities where a uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed.

Grading, Erosion, and Sediment Control (GESC) Drawings - Illustrative portion of the GESC Plan that shows the location and extent of all grading, erosion, and sediment control CMs as well as other associated information required by these Requirements.

Grading, Erosion, and Sediment Control (GESC) Plan - Also known site plans, construction stormwater site plans, sediment and erosion control plans, stormwater pollution prevention plans, drainage reports, drainage plans, stormwater management plans, drainage and erosion control plans, etc. Includes the GESC Drawings and GESC Report.

Grading, Erosion, and Sediment Control (GESC) Report - Report required to be submitted with the GESC Plan that details all aspects of the GESC Plan such as soils, areas, and volumes, etc.

Inadequate Control Measure - 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. See also Control Measure Requiring Routine Maintenance.

Illicit Discharge - Any discharges to an MS4 that is not composed entirely of stormwater except discharges specifically authorized by a CDPS or NPDES permit and discharges resulting from emergency firefighting activities. Permittees should note that there are many types of illicit discharges that in accordance with the permit need to be effectively prohibited. Only the discharges listed in Part.I.2.a.v. can be excluded from being effectively prohibited.

Land Disturbing Activity - Any activity that results in a change in the existing land surface (both vegetative and non-vegetative). Land disturbing activities include, but are not limited to clearing, grading, excavation, demolition, installation of new or improved haul roads and access roads, staging areas, stockpiling of fill materials, and borrow areas. Compaction that is associated with stabilization of structures and road construction shall also be considered a land disturbing activity.

Larger Common Plan of Development or Sale - A contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules, but remain related. The Division has determined that “contiguous” means construction activities located in close proximity to each other (within ¼ mile).

Major Modifications - Modifications to the GESC plan involving re-engineering, or changes to the site hydrology, which may include changes to grading, drainage, design intent, beyond limits of a Control Measure, or eliminating a Control Measure. Control Measures that may meet Major Modification

requirements are indicated with a “box” on the Legend.

Minor Modifications - Modifications to the GESC plan made throughout the project to address changes in site conditions that do not meet the Major Modifications definition and are generally a like for like, or more suitable Control Measure substitution.

Operator - The party that has operational control over day-to-day activities at a project site which are necessary to ensure compliance with the permit. This party is authorized to direct individuals at a site to carry out activities required by the permit. (E.g. the general contractor).

Owner - The party that has overall control of the activities and that has funded the implementation of the construction plans and specifications. This is the party with ownership of, a long term lease of, or easements on the property on which the construction activity is occurring (e.g., the developer).

Stormwater Manager – 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 Stormwater Manager is the Permittee’s contact person with the City for all matters pertaining to the GESC Plan and Stormwater Permit and shall respond to requests made by City staff and have any deficiencies in the work corrected. The Stormwater Manager may be an employee of the Owner or Contractor and shall have the authority to act on behalf of the Permittee, including committing funds, to ensure that the site remains in compliance with the Stormwater Permit. The Stormwater Manager’s responsibilities are outlined in Section 3.3.

Stormwater Permit - Permit obtained from the City prior to commencement of land disturbing activities, as described in these Requirements. This is separate from the State CDPS permit issued by the Water Quality Control Division.

Stormwater Construction Permit (Stormwater Discharges Associated w/ Construction Activities) - CDPS permit issued by the Water Quality Control Division to discharge stormwater associated with construction activities into waters of the state of Colorado.

 APPENDICES

A – City of Glendale GESC Plan Review Checklist

B – Glendale Standard Notes and Details

C – Developer/Designer Certification Statements

D – Stormwater Permit

E– Pre-Con Agenda

F – Additional Resources