Loading...
HomeMy WebLinkAboutResolution 2019-047 Approving and Authorizing Updated Verstion of Stormwater Management Plan MARANA RESOLUTION NO. 2019-047 RELATING TO PUBLIC WORKS; APPROVING AND AUTHORIZING AN UPDATED VERSION OF THE TOWN OF MARANA STORMWATER MANAGEMENT PLAN AS REQUIRED BY STATE AND FEDERAL LAW WHEREAS the Town of Marana is a regulated Phase II Small Municipal Separate Storm Sewer System (MS4); and WHEREAS the Town of Marana is mandated by the Arizona Department of Environmental Quality (ADEQ) to comply with Arizona Pollutant Discharge Elimination System (AZPDES) Program requirements; and WHEREAS the Town of Marana submitted a Notice of Intent (NOI) to Discharge and a Storm Water Management Plan (SWMP) in March of 2003 to the Arizona Department of Environmental Quality (ADEQ) as required by the AZPDES Phase II implementation; and WHEREAS the Town of Marana received an NOI authorization letter from ADEQ, and the Town is operating under an MS4 stormwater permit; and WHEREAS the Mayor and Council approved the original SWMP on March 7, 2006, by the adoption of Marana Resolution No. 2006-037; and WHEREAS the Mayor and Council approved an updated version of the SWMP on September 4, 2007, by the adoption of Marana Resolution No. 2007-148; and WHEREAS a further updated version of the SWMP has now been prepared by Town staff for Council's consideration to comply with new ADEQ requirements for wet water testing and to streamline other practices within the SWMP; and WHEREAS the Mayor and Council of the Town of Marana find that this resolution and its ultimate purpose of reducing stormwater pollution are in the best interests of the Town of Marana and its citizens. NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND COUNCIL OF THE TOWN OF MARANA, ARIZONA, that the updated Stormwater Management Plan for the Town of Marana (the updated SWMP), attached as Exhibit A to this resolution, is hereby approved. 00063318.DOCX/1 Marana Resolution No.2019-047 - 1 - 5/8/2019 3:22 PM IT IS FURTHER RESOLVED that the Town's Manager and staff are hereby directed and authorized to undertake all other and further tasks required or beneficial to carry out the terms, obligations, and objectives of the updated SWMP. PASSED AND ADOPTED by the Mayor and Council of the Town of Marana, Arizona, this 21st day of May, 2019. I _ 4 Mayo 'd "onea ATTEST: APP r ! ED AS TO FORM: 06444 q-An: .100 42-Cherry L. wson, Town Clerk rf Cassidy, Town Attorney .1)661. MARANA AZ ESTABLISHED 1977 00063318.DOCX/1 Marana Resolution No.2019-047 - 2 - 5/8/2019 3:22 PM EXHIBIT A Executive Summary This Stormwater Management Plan (SWMP) has been prepared by the Town of Marana as a requirement of Section 5.1 of the Arizona Department of Environmental Quality(ADEQ)Arizona Pollutant Discharge Elimination System (AZPDES)General Permit for stormwater discharges from Small Municipal Separate Storm Sewer Systems (MS4)to Waters of the United States (AZG2016-002)which was adopted on September 30, 2016. This SWMP describes the policies and procedures that the Town implements to reduce,to the maximum extent practicable, pollutant discharges to and from it MS4. The overall goal of the program is to ensure that discharges from the MS4 do not cause or contribute to exceedances of surface water quality standards. As required by the Permit,this SWMP addresses the six minimum control measure (MCMs): (1) Pubic Education and Outreach, (2) Public Involvement and Participation, (3) Illicit Discharge Detection and Elimination, (4) Construction Site Stormwater Runoff control, (5) Post-Construction Stormwater Management,and (6) Pollution Prevention/Good Housekeeping for Municipal Operations. This SWMP is a comprehensive program document outlining how the stormwater program is implemented and maintained,therefore,sections have been included to describe other permit required support activities, including training,SWMP evaluation and revision, reporting, and signatory requirements. The SWMP complies with the requirements specified in Code of Federal Regulations (CFR)Chapter 40 Part 122.32, incorporated by reference in Arizona Administrative Code(AAC) R18-9- A902 and A905. Table of Contents 1. Stormwater Program Background 2. Stormwater Control Measures 3. Monitoring 4. Annual Program Evaluation 5. SWMP Reporting and Program Staffing 6. Stormwater Management Program Attachments 1. STORMWATER PROGRAM BACKGROUND Introduction: The Town of Marana developed this Stormwater Management Program (SWMP) in accordance with the Arizona Pollutant Discharge Elimination System (AZPDES) Permit for small Municipal Separate Sewer Systems (MS4)AZG2016-002 that authorizes stormwater discharge. Surface waters of the United States are susceptible to pollutants carried in stormwater and urban runoff. Poorly managed stormwater systems can lead to high levels of nutrients, bacteria, heavy metals, oils, and excess sediment being discharged into rivers and washes. The potential consequences of uncontrolled stormwater runoff include erosion of topsoil,the degradation of riparian habitat, and modified hydrologic patterns, resulting in flooding problems and contamination of drinking water sources. Municipalities can prevent many of these impacts by encouraging or requiring responsible land use practices within their jurisdictions. This SWMP describes the control measures, or Best Management Practices (BMP)that the Town of Marana uses to manage the quality of discharges from the MS4. Regulatory Background: The 1972 amendments to the Federal Water Pollution Control Act(known as the Clean Water Act [CWA]) provide the statutory basis for the National Pollutant Discharge Elimination System (NPDES) permit program. Section 402 of the CWA specifically required the EPA to develop and implement the NPDES program. The EPA implemented the NPDES stormwater program in two phases. Phase I covered large and medium-sized municipal separate storm sewer systems (MS4s),certain industrial facilities,and construction activities that disturbed more than five acres. Phase II expanded the NPDES regulatory sphere to include construction project disturbing one or more acres and small MS4s that fall within and "Urbanized Area" as defined by the 2010 U.S. Census. The Town of Marana was designated as a small regulated MS4 because a small portion of the Town falls within the Tucson urbanized Area. The Stormwater Phase II regulations in Arizona are administered by the Arizona Department of Environmental Quality(ADEQ). The current Arizona State General Permit for Phase II MS4s was adopted September 30, 2016(AZG2016-002). The Town of Marana last updated its Stormwater Management Ordinance in 2008. The primary objectives of the Town's regulations were to prevent,control, and reduce stormwater pollution from construction sites,as well as to detect and eliminate illicit discharges. This document updates the SWMP for the current AZPDES permit. Geographic Setting: The Town of Marana is a fast growing community along Interstate 10 northwest of the City of Tucson with land in both Pima and Pinal counties. The Town is approximately 121 square miles and has a population of about 43,000 people. The Town was incorporated in 1977 and employs a council-manager form of municipal government with a mayor and six member Town Council. Receiving Waters and Outfalls: The major watercourses in the Marana area are the Santa Cruz River,the Rillito Creek, and the Canada del Oro Wash. There are numerous ephemeral washes that drain into these larger waterways, but no known natural perennial waterways exist within the Town of Marana boundaries. Runoff from both the Tortolita Mountains (to the east)and the Tucson Mountains (to the west)also represents a major component of the stormwater drainage pattern in the Marana area. The two watercourses that the Town of Marana discharges to are the Santa Cruz River and the Canada del Oro Wash. The part of the Santa Cruz River that runs from Orange Grove to just north of Avra Valley Road is a category 4B/5 Not Attaining/Impaired watercourse. In that area,the river is impaired for Ammonia and E.coli. The Town of Marana has 43 outfalls to the Santa Cruz River, and 1 outfall to the Canada del Oro Wash, which are inspected every year for illicit discharges. Stormwater Infrastructure Mapping: The Town of Marana maintains maps of the storm sewer system,outfalls and receiving waters within the urbanized areas of the Town. The current compliance area was determined by the assignment of Urbanized Areas in the 2010 Census. As development happens within the urbanized areas, it will be included on the storm sewer system maps and any new outfalls marked and added to the outfall inspection list. Each time that the Census is completed, it will be reviewed to determine if the compliance area within the Town needs to be updated. 2. STORMWATER CONTROL MEASURES There are six minimum control measures (MCMs)specified in section 6.4 of the Small MS4 General Permit(General Permit). The Town of Marana,through its Stormwater Program staff, has created its own set of best management practices (BMPs)to address the required MCMs to the maximum extent practicable. The progress and effectiveness of these BMPs is addressed in the Annual Report that must be turned in to ADEQ. BMPs may be added or modified by the Town depending on their effectiveness. MCM-1 Public Education and Outreach The key to effective implementation of a stormwater management program is to foster community awareness and understanding of the issues surrounding stormwater pollution. Most people are unaware that stormwater flows are one of the most significant sources of water pollutants. Support for stormwater management increases when the public understands the importance of stormwater pollution prevention and recognizes their role in protecting local waterways. As a result, public support for the SWMP increases the degree of local compliance with program requirements. The program focuses on pollutants of concern for impaired waters, but also targets pollutants and pollutant sources that are familiar to the target audiences such as: • Animal/Pet Waste • Automotive chemical leaks and disposal • Herbicides, pesticides, and yard waste • Sediment from construction sites • Illegal dumping Target audiences for educational discussions and outreach include: • Homeowners Associations • Students • Business Owners that may contribute pollutants to stormwater • Construction Sites • Municipal Employees The following BMPs have been selected to best meet the Town's Public Outreach and Education minimum control measures. BMP 1.1: Develop and distribute brochures for target audiences that have the greatest potential to impact the storm drainage system. All brochures will be available at the main offices of the Town of Marana for the general public. The Town will also mail subject specific brochures and newsletters to current businesses. BMP 1.2: Have a portion of the Town of Marana website dedicated to the Stormwater Program. The website will be added to as needed with an annual review of content for corrections and/or amendments. The Town website address will be printed on all stormwater promotional items. BMP 1.3: Develop a stormwater pollution prevention presentation for school age children. The number of student presented each year will be documented, and the presentation reviewed annually for content relevance. MCM-2 Public Involvement and Participation Efforts by the Town of Marana to involve the public in the development and implementation of the stormwater management program creates the opportunity to bring together much needed community support and increase the level of compliance with program requirements. The success of a public involvement/participation effort relies on early and frequent involvement opportunities that build the community's sense of ownership in the stormwater management effort. The Town of Marana currently supports the following pollution prevention public involvement and participation efforts. BMP 2.1: Provide access to the SWMP on the town of Marana website. The website will be reviewed annually to make sure that the most current version of the SWMP is posted for public access. The website address will be printed on all stormwater promotional items. BMP 2.2: Annually provide the public an opportunity to review and comment on the SWMP. The Town will use social media to solicit comments from the community on any changes made to the SWMP and Citizen Tracker to respond to those comments. BMP 2.3: Town staff will participate in local and regional stormwater programs,workshops, and advisory committees. The events will be logged in a spreadsheet and will include the topics, date of the event,and other participants at the events. MCM-3 Illicit Discharge Detection and Elimination(IDDE) Program Illicit discharges are any wastes or wastewater that enter a storm drain or storm sewer system and are not composed entirely of stormwater. Such discharges are illicit because municipal storm sewer systems are not designed to accept, process,or discharge such wastes. Sources of illicit discharges can include: effluent from septic tanks; car washing; pool draining or back flushing; improper disposal of auto and household toxics;and oil or chemical spills on roadways. Illicit discharges are more easily detected when there is little or no stormwater runoff. BMP 3.1: Prepare and maintain stormwater sewer map. The Town will identify and map all outfall locations within the compliance area. This map will be updated annually. BMP 3.2: Have an ordinance or other regulatory mechanism to prohibit non-stormwater discharges into the storm sewer system. The Town will implement a council approved ordinance that will be reviewed annually and updated if needed. BMP 3.3: Have a procedure for inspecting mapped outfall points for illicit discharges. Conduct dry weather inspections of all outfall point at least once per year. BMP 3.4: Have a procedure for inspecting a minimum of 5 outfalls that are representative of stormwater discharges.The outfalls will be inspected twice per wet season as defined in section 6.4.3.8(b) of the CGP. BMP 3.5: Have a procedure for receiving, addressing, and recording illicit discharge reports from the public. Illicit discharge reports will be recorded and investigated by Town staff. The number of investigation outcome reports will be included in the annual report to ADEQ. BMP 3.6: Have information available to the public regarding hazardous illicit discharges. Include information regarding hazardous illicit discharges on the Town web page. MCM-4 Construction Activity Stormwater Runoff Control Construction sites are likely to cause significant surface water quality impacts when sediment and erosion controls are lacking or inadequate. These negative effects are associated with both the sediment washed into watercourses and the pollutants bound to those soil particles. These pollutants, which are often the primary concern for the impairment of surface water, can include nutrients, pesticides, oils and grease,concrete truck washout, and construction chemicals and debris. BMP 4.1: Require all projects greater than 1 acre or part of a larger common plan of development to submit a SWPPP for review and acceptance by the Town prior to the issuance of a grading permit. The Town will review all SWPPPs submitted for private and public projects and report the number reviewed in the annual report to ADEQ. BMP 4.2: Require that all grading plans for projects greater than 1 acre, or part of a larger common plan of development be reviewed and accepted for coordination with the project SWPPP. The town will review all grading plans submitted for private and public projects and report the number reviewed in the annual report. BMP 4.3: Inspect construction project greater than 1 acre or part of a common plan of development to ensure compliance with the Town Ordinance. Town staff will conduct inspections of active construction sites and record the results of the inspections. The number of inspections completed will be included in the annual report. MCM-5: Post-Construction Stormwater Management in New Development and Redevelopment Land development significantly impacts thequalityof surface waters through the alterations of th e natural landscape,especially through the increase in impervious surface. This land use change increases not only the quantity of stormwater runoff but also the quality of the stormwater. Increased runoff volumes can cause downstream flooding, channel and bank erosion,sedimentation, and reduced groundwater recharge. The pollutants carried by these larger stormwater flows can include soil sediments, oils,grease, litter,and other toxic substances that collect on paved or otherwise impervious surfaces. BMP 5.1: Require grading plans to prevent or minimize impacts to water quality from stormwater runoff. Town staff will review grading plans for all construction projects greater than 1 acre or part of a common plan of development to ensure all requirements for controls that reduce or eliminate the discharge of pollutants from the site after construction activities are completed will be installed. BMP 5.2: Implement an inventory system of all post construction structural stormwater control measures that discharge into the MS4 that are located on Town property. The inventory will be updated at annually and will be searchable by control measure type. The inventory will also log maintenance activities. BMP 5.3: The Town of Marana follows the guidelines set forth in the 2014 Pima County Regional Flood Control District Design Standards for Stormwater Detention and Retention to require a 15 percent reduction in stormwater runoff when comparing pre and post construction runoff amounts. This is done at the time of grading plan review and is done by the Town's Subdivision Engineering Division. MCM-6: Pollution Prevention and Good Housekeeping for Municipal Operations Municipalities can contribute a significant amount of pollutants to stormwater through the maintenance and operation of parks,open space, landscaping, municipally-owned vehicles, public streets and roadways. Beyond the importance of setting a good example within the community, pollution prevention and good housekeeping efforts can save the municipality money over time. Preventing trash and other debris from entering the storm sewer system can reduce damage to system components and lower repair and maintenance costs. BMP 6.1: Training staff on general stormwater pollution prevention procedures. The Town will utilize video training on even number years to have all Town employees learn about basic stormwater pollution prevention procedures. BMP 6.2: Provide specialized training to staff more likely to affect stormwater quality.The Town will provide annual training for Parks and Recreations staff as well as the Water Department staff. BMP 6.3: Perform regular inspections at Town of Marana facilities that have high potential for pollutant discharge. Inspections will be performed and recorded for the Fleet Maintenance facility and the Regional Airport. 3. MONITORING: The two watercourses that the Town of Marana discharges to are the Santa Cruz River and the Canada del Oro Wash. The part of the Santa Cruz River that runs from Orange Grove to just north of Avra Valley Road is a category 4B/5 Not Attaining/Impaired watercourse. In that area,the river is impaired for Ammonia and E.coli. Since all of the Town's outfalls occur within this stretch of the Santa Cruz River, analytical monitoring will be required for 5 of the outfalls selected for stormwater discharge monitoring. Rainfall measurements will be logged using the automated Local Evaluation in Real Time(ALERT)system. The ALERT system is composed of weather stations equipped with real-time sensors and a radio telemetry system transmitting the data to base station computers. The weather station is equipped with a tipping bucket rain gauge. Each time a tipping bucket registers 0.5 inches of rainfall, a notice is sent to the stormwater monitoring team who mobilize to the monitor sites and collect first-flush samples as soon as practicable. Sampling is required twice in the summer wet season (June 1—October 31) and twice in the winter wet season (November 1—May 31). The water quality data will be compared to surface water quality standards (SWQS). If a sample indicates concentrations are higher than the SWQS,the watershed draining to the monitor point is evaluated to determine the source of the pollutants. The pollutant load is based on the area of the watershed,the rate of flow and the concentration of the parameter. The Town of Marana has developed a Sampling and Analysis Plan that will be followed and updated as necessary. 4.ANNUAL PROGRAM EVALUATION Town of Marana staff will review the SWMP each year to evaluate compliance with the terms and conditions of the permit. The Town will evaluate the appropriateness of the selected BMPs in achieving the objectives of each control measure and the defined measurable goals. During the annual review, the town determines if revisions to the SWMP are required and appropriate. If SWMP revisions or additions are needed,the town will notify ADEQ of any changes to the SWMP. If components of the SWMP need to be altered,the Town submits the proposed revisions to ADEQ with an explanation of why the original practice was ineffective and how the alterations will better address the goals of the management practice. A description of the evaluation process and all outcomes will be reported to ADEQ as part of the Annual Report. 5. SWMP REPORTING AND PROGRAM STAFFING The Town will submit an annual report each year of the permit term to ADEQ. The reporting period is from July 1 through June 30 each year. The annual report is due to ADEQ on or before September 30 each year for the reporting period. The annual reports shall contain the following information: • The status of compliance with the permit terms and conditions; • Updates regarding mapping requirements including percent complete; • An evaluation of the appropriateness and efficacy of the selected BMPs; • As assessment of the progress towards achieving the measurable goals and objective of each control measure; • Description of the activities used to promote public participation; • Description of the activities related to implementation of the IDDE program including the number and identifier of assets inspected or evaluated; number and identifier of outfalls screened; number of illicit discharges located; number of illicit discharges removed;and employee training; • All outfall screening and monitoring data collected by or on behalf of the permittee during the reporting period and cumulative for the permit term; • Identification of all discharges determined to be causing or contributing to an exceedance of water quality standards and description of response; • For discharges subject to TMDLs, identification of specific BMPs used to address the pollutant identified as the cause of the impairment and assessment of the BMPs effectiveness at controlling the pollutant; • Status of the construction runoff management including number of project plans reviewed, number of inspections, and number of enforcement actions; • Status of stormwater management for new development and redevelopment including status of ordinance development and review; • Status of the operation and maintenance programs required by Part 6.4.6.1 of the MS4 permit; • Description of any changes in identified BMPs or measurable goals; • Any additional reporting requirements; • Description of activities to be conducted during the next reporting cycle. Stormwater Staffing Town Engineer Keith Brann 520-382-2600 Assistant Director of Engineering Jennifer Christelman 520-382-2600 Environmental Project Manager Paula Bluemer 520-382-2600 7. STORMWATER MANAGEMENT PROGRAM ATTACHMENTS a. AZPDES Phase II MS4 Current Permit b. Notice of Intent c. Compliance Area Map d. Sampling and Analysis Plan Town of Marana Stormwater Sampling and Analysis Plan Sampling Areas The five outfall sampling areas will be established by the Town of Marana. The areas will have easy access in times of wet weather and will be equipped with their own rain gauges. If maintenance is needed at the sampling area to keep it accessible, it will be noted in the sampling report and addressed as soon as practicable and/or before the next anticipated rain event. Rain Gauges The Pima County Regional Flood Control District (RFCD)operates the Automated Local Evaluation in Real Time (ALERT),a network of real-time rainfall and runoff sensors in Pima County watersheds. Transmitters send rainfall data from the sensors to a base station computer. Sample Site Rain Gauge Number Rain Gauge Address 256,313 6020 Ina and Santa Cruz River 32, 89 6110 Avra Valley Airpark 314 1200 Canada del Oro The base station transmits a text alert to the listed phone number for the Town of Marana from three rain gauges. When a rain gauge bucket reaches a minimum level of.5" and the ALERT system registers the event,the ALERT system texts the listed phone number with information as to the level of the rain event and which rain gauge registered the event. Team Mobilization Currently the sampling team consists of Paula Bluemer. When alerted by text that rainfall of at least .5" has been recorded during regular office hours of 8-5,the sampling team will check the weather forecast to make sure that conditions are safe for sampling. The team will then take all necessary sample gathering equipment and analysis equipment to the sampling sites. Team members should wear appropriate protective equipment. When at the sampling sites, accessibility of the site will be checked. Any vegetation or debris that may interfere with access of the site will be removed at the time or noted on the sampling form and removed at a later date. On-site rain gauges will have their contents noted on the sampling form and then cleaned out. Sample Collection Separate"grab"samples will be collected for both E.coli and ammonia. Sample bottles will be provided by the laboratory and kept sealed until ready for collection. Collections will be made directly from stormwater flown a d the samples will beplaced in a cooler filled with ice for transport to the p p laboratory. A separate plastic bottle will be used to collect extra stormwater to record turbidity,sheen, odor,and pH. This will be done by Town of Marana staff. The samples for E.coli and ammonia will be taken directly to the laboratory for testing. The E.coli must be taken to the lab within 2 hours of collecting the sample for accurate analysis. Sample Documentation A sample form will be used to collect information such as time and date of collection, condition of the collection site,any reason for deviations from typical protocol, and name of the team member that collected the sample. The form will also record the time that the sample was delivered to the laboratory. The laboratory processing the samples will provide their own bottles and labels for collection as well as a chain of custody form to be filled out when the sample is delivered to the laboratory. Sample Delivery Once all samples have been collected,they will be delivered to the laboratory in a cooler with ice. The samples will be turned over for analysis and the laboratory will provide the Town a report outlining their findings.