Pretreatment Program

Pretreatment ProgramPublic Hearing 3/12/13Why is this needed?What is involved?How does it affect Prescott businesses and industries?

11Why?Wastewater Treatment Plant

Recharge BasinsAquifer Protection Permit (APP)2Why?Wastewater Treatment Plants designed to remove pollutants/concentrations typical of domestic discharges OrganicsBOD5, CODNutrientsAmmonia, PhosphorusSolidsTotal Suspended Solids (TSS)Other pollutants (e.g., metals or FOG) controlled by pretreatment limits or Best Management Practices3Why?High pollutant concentrations discharged to sewer system can cause:Blockages resulting in sewer overflowsExceedance of APP limits (can result in Notice of Violation, Consent Order, or fines from ADEQ)Additional cost in operation/maintenance of treatment facilities4What?Citys Pretreatment Program will:Reduce sewer overflowsControl discharges into sewer systemProtect wastewater treatment plantsMaintain high effluent and biosolids qualityProtect the public, City workers, and the environment

5What?Pretreatment Program StatusUpdated Sewer Use Ordinance to establish legal authority for implementing pretreatment programDeveloped Enforcement Response Plan (ERP)Updated 2011 Local Limits ReportConducting Industrial Waste Survey (IWS)

6What?Sewer Use Ordinance (City Code Ch 2-1)Establishes responsibility and authority of Public Works DirectorIncludes prohibited dischargesSets up permitting programDescribes enforcement options for noncompliance7What?Enforcement Response Plan (ERP)Establishes fair and consistent enforcement proceduresEnsures enforcement responses are appropriate to nature/severity of violationContains Citys enforcement options and potential fines8What?Local Limits UpdateEvaluates max pollutant loading that can be received at treatment plant and still meet APP permit limits Calculates pretreatment limits that are site-specific and technically-basedApplies only to Significant Industrial Users (SIUs) as controlled sources9What?Industrial Waste Survey (IWS)Includes questions about facility operations and wastewater dischargedUsed to assess nature/volume of wastewater dischargedIdentifies commercial & industrial dischargers10What?Significant Industrial UsersSubject to Categorical Pretreatment StandardsDischarge 25,000 gpdContribute 5% or more of hydraulic or organic capacity of treatment plantDesignated by City based on potential to impact treatment plant

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Airport WRPSundog WWTP% Industrial Flow/ Influent18%0.01%12Significant Industrial UsersWhat?Examples of Commercial Users:

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Dry CleanersRestaurantsAuto Repair Facilities

Medical / Dental OfficesWhat?Potential Impacts

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Sewer drain clogged with greaseVideo of sewer line clogged with greaseWhat?Potential Impacts15

Grease balls at Sundog WWTP, caused overflow at headworks; grease decreases treatment plant efficiency How?With Pretreatment Program, City can:Issue Industrial Wastewater Discharge Permits to Significant Industrial UsersIssue General Permits to commercial dischargersDevelop Best Management Practices for industrial and commercial dischargersPerform Site Inspections

16How?Best Management Practices include:Installing/maintaining grease interceptors/trapsTraining employees Dry wiping pots and dishware before washingRecycling of used oils and solventsPreventing leaks and spills from entering floor drains 17Next StepsCompile data from Industrial Waste Survey (IWS) currently in progressIdentify potential Significant Industrial UsersWork with Industrial Users to develop permits and compliance schedulesPerform cost benefit analysis of pretreatment program

18Next StepsAssess impact from commercial dischargersDevelop outreach/education information for commercial dischargersIdentify BMPs for specific groups of commercial dischargers (e.g., food service)Assess implementing general permits for some commercial dischargers19Next Steps20March 2013May 2013June 2013April 20133/12Public Hearing30-day Public Comment Period4/23PublicCommentsPresentation5/1Submit toADEQ6/1*ADEQ Approval4/30City CouncilAdoption30-day Public Comment PeriodNext Steps21July 2013Begin Permitting Significant Industrial Users (SIUs)December 20131st Round of SIU samplingOutreach/education for Commercial DischargersAnticipated SchedulePretreatment ContactCity of Prescott Utilities Operations Water ProtectionJeremy Reynolds Water Protection Specialist(928)777-1615jeremy.reynolds@prescott-az.govhttp://www.cityofprescott.net/services/water/protection.php

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