National Pollutant Discharge Elimination System (NPDES) Permit ...

Table of ContentsIntroduction ................................................................................................................................................... 1Summary of Permit Conditions..................................................................................................................... 2Procedures for Participation in the Formulation of Final Determinations .................................................... 4Location of Discharge/Receiving Water Use Classification ......................................................................... 5Facility Description ....................................................................................................................................... 5Description of Existing Discharge ................................................................................................................ 6Assessment of Impact on Receiving Waters ................................................................................................. 7Development of Water-Quality-Based Effluent Limits ................................................................................ 8Reasonable Potential/ Effluent Limits/Hazard Management Decisions ....................................................... 9Other Requirements .................................................................................................................................... 12List of FiguresFigure 1 Approximate Location of Oregon WWTP .................................................................................. 13List of TablesTable 1. Effluent Characterization Based on Pretreatment Data ................................................................ 15Table 2. Effluent Characterization Based on Self Monitoring Data .......................................................... 16Table 3. Projected Effluent Quality Values ................................................................................................ 20Table 4. Station 602 Secondary Bypass Data for the Oregon WWTP ........................................................ 21Table 5. Summary of Acute Toxicity Test Results ..................................................................................... 22Table 6. Water Quality Criteria in the Study Area...................................................................................... 23Table 7. Instream Conditions and Discharger Flow.................................................................................... 23Table 8. Summary of Effluent Limits to Maintain Applicable Water Quality Criteria .............................. 26Table 9. Parameter Assessment for Outfall 001.......................................................................................... 27Table 10. Final Effluent Limits and Monitoring Requirements for Outfall 001 ......................................... 28Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-3-

Procedures for Participation in the Formulation of Final DeterminationsThe draft action shall be issued as a final action unless the Director revises the draft after consideration ofthe record of a public meeting or written comments, or upon disapproval by the Administrator of the U.S.Environmental Protection Agency.Within thirty days of the date of the Public Notice, any person may request or petition for a publicmeeting for presentation of evidence, statements or opinions. The purpose of the public meeting is toobtain additional evidence. Statements concerning the issues raised by the party requesting the meetingare invited. Evidence may be presented by the applicant, the state, and other parties, and followingpresentation of such evidence other interested persons may present testimony of facts or statements ofopinion.Requests for public meetings shall be in writing and shall state the action of the Director objected to, thequestions to be considered, and the reasons the action is contested. Such requests should be addressed to:Legal Records SectionOhio Environmental Protection AgencyP.O. Box 1049Columbus, Ohio 43216-1049Interested persons are invited to submit written comments upon the discharge permit. Comments shouldbe submitted in person or by mail no later than 30 days after the date of this Public Notice. Deliver ormail all comments to:Ohio Environmental Protection AgencyAttention: Division of Surface WaterPermits and Compliance SectionP.O. Box 1049Columbus, Ohio 43216-1049The Ohio EPA permit number and Public Notice numbers should appear on each page of any submittedcomments. All comments received no later than 30 days after the date of the Public Notice will beconsidered.Citizens may conduct file reviews regarding specific companies or sites. Appointments are necessary toconduct file reviews, because requests to review files have increased dramatically in recent years. Thefirst 250 pages copied are free. For requests to copy more than 250 pages, there is a five-cent charge foreach page copied. Payment is required by check or money order, made payable to Treasurer State ofOhio.For additional information about this fact sheet or draft permit, contact Sara Hise by phone at (614) 644-4824 or by email at sara.hise@epa.state.oh.us.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-4-

Location of Discharge/Receiving Water Use ClassificationThe Oregon WWTP discharges to the Maumee Bay in Lake Erie at Lake Mile 1299.24. The approximatelocation of the facility is shown in Figure 1.This segment of Lake Erie is described by Ohio EPA River Code: 24-100, U.S. EPA River Reach #:0100010, County: Lucas, Ecoregion: Huron/Erie Lake Plains. Lake Erie is designated for the followinguses under Ohio’s WQSs (OAC 3745-1-31): Exceptional Warmwater Habitat (EWH), Superior HighQuality Water (SHQW), Public Water Supply (PWS), Agricultural Water Supply (AWS), IndustrialWater Supply (IWS), and Bathing Waters (BW).Use designations define the goals and expectations of a waterbody. These goals are set for aquatic lifeprotection, recreation use and water supply use, and are defined in the Ohio WQS (OAC 3745-1-07). Theuse designations for individual waterbodies are listed in rules -08 through -32 of the Ohio WQS. Oncethe goals are set, numeric WQS are developed to protect these uses. Different uses have different waterquality criteria.Use designations for aquatic life protection include habitats for coldwater fish and macroinvertebrates,warmwater aquatic life and waters with exceptional communities of warmwater organisms. These usesall meet the goals of the federal Clean Water Act. Ohio WQS also include aquatic life use designationsfor waterbodies which cannot meet the Clean Water Act goals because of human-caused conditions thatcannot be remedied without causing fundamental changes to land use and widespread economic impact.The dredging and clearing of some small streams to support agricultural or urban drainage is the mostcommon of these conditions. These streams are given Modified Warmwater or Limited Resource Waterdesignations.Recreation uses are defined by the depth of the waterbody and the potential for wading or swimming.Uses are defined for BW, swimming/canoeing (Primary Contact) and wading only (Secondary Contact -generally waters too shallow for swimming or canoeing).Water supply uses are defined by the actual or potential use of the waterbody. PWS designations applynear existing water intakes so that waters are safe to drink with standard treatment. Most other waters aredesignated for AWS and IWS.Facility DescriptionThe City of Oregon Wastewater Treatment Plant is designed to treat an average daily flow of 8.0 milliongallons per day (MGD), and has a hydraulic capacity of 36 MGD. The treatment plant was originallyconstructed in 1977, with the most recent upgrade occurring in 1997. Treatment plant processes and/orequipment include:Bar screen;Influent pumping;Grit removal;Comminution;Flow equalization;Primary settling;Activated sludge;Ferrous chloride addition;Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-5-

Secondary aeration;Final settling;Chlorination; andDechlorination.Ferrous chloride is added during the activated sludge process to remove phosphorus. When the influentflow at the facility exceeds 24 MGD, wastewater is bypassed around the activated sludge and finalsettling processes to the flow equalization tanks which have a capacity of 1.5 million gallons. Wastewaterfrom the flow equalization tanks is sent directly to the chlorine tank for disinfection. The secondarybypass was used five times in 2010 and 13 times in 2011.Sludge is processed by aerobic digestion and settling, and removed for land application at argonomicrates. Annual sludge production according to discharge monitoring reports (DMRs) was relativelyconstant from 2007 to 2010 (average of about 770 dry tons per year).The water supply source for the City is Lake Erie.Collection SystemThe City of Oregon’s collection system includes only separate sanitary sewers, and serves the City ofOregon, Jerusalem Township, the Village of Harbor View, Maumee Bay State Park, as well as a numberof other entities, serving a total population of approximately 25,450 people. There are two lift stations inthe collection system. The City estimates the inflow and infiltration rate (I/I) for the collection system at3,934,000 gallons per day, which is a significant increase over the estimate presented in the previouspermit. Over the last several years, Ohio EPA has received a number of citizen complaints involvingoverflows in the collection system including water and sewage in basements.Capacity, Management, Operation, and Maintenance ProgramAs part of the previous permit, the facility was required to develop a CMOM. The CMOM wasimplemented as part of the 2011 permit modification. As part of the CMOM, the City implemented an I/IReduction Program. The program consists of sewer identification, flow monitoring, smoke testing, videoinspection, and sewer rehabilitation. The initial flow monitoring program has been completed. The firstphase of sanitary sewer rehabilitation has also been completed.A system evaluation and capacity assurance plan (SECAP) and No Feasible Alternatives (NFA) study hasbeen completed and submitted to Ohio EPA. Ohio EPA is currently reviewing the SECAP and NFAstudy.Description of Existing DischargeThe average design flow for the Oregon WWTP is 8.0 MGD, but the daily flow based on DMRsubmittals is normally less. Daily flow has varied between 4.4 and 5.6 MGD based on the 50 th percentilevalues. Maximum flow has varied between 28.1 and 35.1 MGD.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-6-

Local industries contribute approximately 0.062 MGD to the flow received at Oregon’s WWTP. Onenon-categorical significant industrial user discharges an average of 0.006 MGD to the Oregon sewersystem, while the remaining industries contribute approximately 0.056 MGD. aStations 300 and 602Station 300 is the sanitary sewer overflow reporting station; no overflows were reported. Per the CMOMand schedule of compliance in the existing permit, Oregon WWTP installed a bypass monitoring stationin 2010 (Station 602). The secondary bypass was used five times in 2010 and 13 times in 2011. Theaverage volume per event is 3.44 million gallons. Bypasses occur more frequently in the winter seasonthan in the summer season, most likely due to the increase in rainfall.Table 1 presents chemical specific data compiled from the data reported in annual pretreatment reports.Table 2 presents a summary of unaltered DMR data for outfall 001. Data are presented for the periodOctober 2006 to September 2011, and current permit limits are provided for comparison.Table 3 presents the PEQs for Oregon WWTP.Table 4 presents a summary of the Station 602 (secondary bypass) data for Oregon WWTP.Table 5 summarizes the results of acute whole effluent toxicity (WET) tests of the final effluent.Under the provisions of 40 CFR 122.21(j), the Director has waived the requirement for submittal ofexpanded effluent testing data as part of the NPDES renewal application. Ohio EPA has access tosubstantially identical information through the submission of annual pretreatment program reports and/orfrom effluent testing conducted by the Agency.Assessment of Impact on Receiving WatersComprehensive and recent biological data for Lake Erie is not available to assess the water qualityimpact. The draft Ohio 2012 Integrated Water Quality Monitoring and Assessment Report includeslimited information based on a few locations sampled in 2000-2002. Of the five sites sampled at thattime, all were in the non-attainment category for aquatic wildlife use. The report also states that OhioEPA initiated the Comprehensive Nearshore Monitoring Program in 2011. The project initially built onthe 2010 National Coastal Condition Assessment framework by adding ambient sites and additionalparameters. The first round of sampling was completed in 2011 and additional sampling will beperformed in 2012 and 2013. Results will be summarized in the 2014 integrated report.The Integrated Report is available at the following Ohio EPA internet site:http://epa.ohio.gov/dsw/tmdl/OhioIntegratedReport.aspxThe most recent near-shore lake monitoring occurred at two stations, 301258 (Lake Erie Ambient Stationoff Maumee Bay) and LELUC001 (Lake Erie Near-shore Station 84 off Maumee Bay). Data is availablefrom these stations for 2010 and 2011. This data was used to develop the background water qualityvalues (Table 7).a Significant industrial users are defined as any industry discharging more than 25,000 gallons per day, industriessubject to federal categorical standards for wastewater discharges, or any other industry classified as “significant” bythe local pretreatment program due to the nature of the effluent from the industry.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-7-

The water chemistry data for these two locations is available at the following Ohio EPA internet site:http://wwwapp.epa.ohio.gov/dsw/gis/wq/index.phpDevelopment of Water-Quality-Based Effluent LimitsDetermining appropriate effluent concentrations is a multiple-step process in which parameters areidentified as likely to be discharged by a facility, evaluated with respect to Ohio water quality criteria, andexamined to determine the likelihood that the existing effluent could violate the calculated limits.Parameter SelectionEffluent data for the Oregon WWTP were used to determine what parameters should undergo WLA. Theparameters discharged are identified by the data available to the Ohio EPA - DMR data submitted by thepermittee, compliance sampling data collected by Ohio EPA, and any other data submitted by thepermittee, such as priority pollutant scans required by the NPDES application or by pretreatment, or otherspecial conditions in the NPDES permit. The sources of effluent data used in this evaluation are asfollows:Self-monitoring data (DMR) October 2006 through September 2011Pretreatment data Aug. 2007, Aug. 2008, Aug. 2009, Aug. 2010This data is evaluated statistically, and PEQ values are calculated for each pollutant. Average PEQ(PEQ avg ) values represent the 95 th percentile of monthly average data, and maximum PEQ (PEQ max )values represent the 95 th percentile of all data points. The PEQ avg and PEQ max values are presented inTable 3.The PEQ values are used according to Ohio rules to compare to applicable WQS and allowable WLAvalues for each pollutant evaluated. Initially, PEQ values are compared to the applicable average andmaximum WQS. If both PEQ values are less than 25 percent of the applicable WQS, the pollutant doesnot have the reasonable potential to cause or contribute to exceedances of WQS, and no WLA is done forthat parameter. If either PEQ avg or PEQ max is greater than 25 percent of the applicable WQS, a WLA isconducted to determine whether the parameter exhibits reasonable potential and needs to have a limit or ifmonitoring is required. See Table 9 for a summary of the screening results.OutliersThe effluent data were checked for outliers and the following value was eliminated from the Outfall 001data set: nitrogen, ammonia, winter season, one value of 3.9 mg/L.Wasteload AllocationFor those parameters that require a WLA, the results are based on the uses assigned to the receivingwaterbody in OAC 3745-1. Dischargers are allocated pollutant loadings/concentrations based on theOhio WQS (OAC 3745-1). Most pollutants are allocated by a mass-balance method because they do notdegrade in the receiving water. WLAs for direct discharges to lakes are done using the followingequation for average criteria: WLA = (11 x Water Quality Criteria) – (10 x Background Concentration).Allocations for maximum criteria are set equal to the Inside Mixing Zone Maximum values.The WLA values in Table 8 would allow the Oregon WWTP to maintain all applicable water qualitycriteria. Allocations cannot exceed the inside mixing zone maximum criteria.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-8-

The data used in the WLA are listed in Tables 6 and 7. The WLA results to maintain all applicablecriteria are presented in Table 8. Design specifications are adequate to control ammonia concentrationsand loading in the final effluent. Ammonia is monitored but at this time no limits are proposed.Whole Effluent Toxicity WLAWhole effluent toxicity (WET) is the total toxic effect of an effluent on aquatic life measured directlywith a toxicity test. Acute WET measures short term effects of the effluent while chronic WET measureslonger term and potentially more subtle effects of the effluent.WQS for WET are expressed in Ohio’s narrative “free from” WQS rule [OAC 3745-1-04(D)]. These“free froms” are translated into toxicity units (TUs) by the associated WQS Implementation Rule (OAC3745-2-09). WLAs can then be calculated using TUs as if they were water quality criteria. For theOregon WWTP, the WLAs are 1.0 TU a and 11.0 TU c for Outfall 001.The chronic toxicity unit (TU c ) is defined as 100 divided by the estimate of the effluent concentrationwhich causes a 25% reduction in growth or reproduction of test organisms (IC 25 ):TU c = 100/IC 25This equation applies outside the mixing zone for warmwater, modified warmwater, exceptionalwarmwater, coldwater, and seasonal salmonid use designations except when the following equation ismore restrictive (Ceriodaphnia dubia only):TU c = 100/geometric mean of No Observed Effect Concentration and Lowest Observed EffectConcentrationThe acute toxicity unit (TU a ) is defined as 100 divided by the concentration in water having a 50% chanceof causing death to aquatic life (LC 50 ) for the most sensitive test species:TU a = 100/LC 50This equation applies outside the mixing zone for warmwater, modified warmwater, exceptionalwarmwater, coldwater, and seasonal salmonid use designations.Reasonable Potential/ Effluent Limits/Hazard Management DecisionsAfter appropriate effluent limits are calculated, the reasonable potential of the discharger to violate theWQS must be determined. Each parameter is examined and placed in a defined "group". Parameters thatdo not have a WQS or do not require a WLA based on the initial screening are assigned to either group 1or 2. For the allocated parameters, the preliminary effluent limits (PEL) based on the most restrictiveaverage and maximum WLA are selected from Table 8. The average PEL (PEL avg ) is compared to theaverage PEQ (PEQ avg ) from Table 8, and the PEL max is compared to the PEQ max . Based on the calculatedpercentage of the allocated value [(PEQ avg ÷ PEL avg ) X 100, or (PEQ max ÷ PEL max ) X 100)], theparameters are assigned to group 3, 4, or 5. The groupings are listed in Table 9.The final effluent limits are determined by evaluating the groupings in conjunction with other applicablerules and regulations. Table 10 presents the final effluent limits and monitoring requirements proposedfor Oregon WWTP outfall 001 and the basis for their recommendation. In addition to permit compliance,this data is used to assist in the evaluation of effluent quality and treatment plant performance, fordesigning plant improvements, and conducting future stream studies.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-9-

Dissolved Oxygen, Total Residual Chlorine, TSS, and CBOD 5Limits for these parameters have been continued from the existing permit. These limits are based upondesign criteria. The effluent limit for chlorine at outfall 001 is less than the quantification level of 0.050mg/l. However, a pollutant minimization program is not required because the dosing rate ofdechlorination chemicals ensures that the water quality based effluent limit is being met.Oil & Grease, pH, and E.ColiLimits proposed for oil and grease, pH, and E. coli are based on WQS (OAC 3745-1). Limits for oil andgrease and pH are continued from the existing permit. Limits for E. coli are based on WQS for BW.AmmoniaMonitoring for ammonia in the summer months is proposed to continue and monitoring for ammonia inthe winter months is proposed to assist in the evaluation of effluent quality and treatment plantperformance.Bis(2-ethylhexyl) phthalateThe Ohio EPA risk assessment (Table 9) places bis(2-ethylhexyl) phthalate in group 4, which indicatesthat the reasonable potential to exceed WQS exists and therefore monitoring is required. However, thisplacement is based on one detection out of four samples. Using the discretion allowed the Director underOAC 3745-33-07(A)(6), monitoring is not proposed for this parameter. This parameter will continue tobe monitored in accordance with the City of Oregon’s approved pretreatment program.MercuryThe Ohio EPA risk assessment (Table 9) places mercury in group 5. This placement as well as the data inTables 2 and 3 indicate that the reasonable potential to exceed WQS exists and limits are necessary toprotect water quality. Pollutants that meet this requirement must have permit limits under OAC Rule3745-33-07(A)(1).The Oregon WWP permit is being renewed to include a mercury variance, and variance-based limits formercury. Based on the monitoring results from January 2007 to December 2011, and the new applicationinformation, the Oregon WWTP has determined that the facility will not meet the 30-day average permitlimit of 1.3 nanograms per liter (ng/L). However, the effluent data shows that the permittee can meet themercury annual average value of 12 ng/L. The permittee’s application has also demonstrated to thesatisfaction of Ohio EPA that there is no readily apparent means of complying with the water-qualitybasedeffluent limit (WQBEL) without constructing prohibitively expensive end-of-pipe controls formercury. Based upon these demonstrations, the Oregon WWTP is eligible for the mercury variance underRule 3745-33-07(D)(10)(a) of the Ohio Administrative Code (OAC).The Oregon WWTP submitted information supporting the renewal of the variance. The permittee hasperformed some monitoring of suspected mercury sources. The PMP schedule developed from theoriginal variance continues to be implemented, and further reductions in mercury may be possible.Ohio EPA has reviewed the mercury variance application and has determined that the application meetsthe requirements of the OAC. As a result, the variance is proposed to be issued as a condition in Part II ofthe NPDES permit, and the following requirements have been incorporated into the draft permit:mercury effluent limits developed from sampling data submitted by the City of Oregon will remain at1.9 ng/l for the 30-day average limit;Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-10-

a requirement that Oregon WWTP make reasonable progress to meet the WQBEL for mercury byimplementing the plan of study which has been developed as part of the pollutant minimizationprogram;influent and effluent monitoring for mercury;a requirement that the average annual effluent concentration for mercury is less than or equal to 12ng/L as specified in the plan of study;a summary of the elements of the plan of study;a requirement for Oregon WWTP to use the most sensitive analytical method approved by U.S. EPA;anda requirement that Oregon WWTP submit a certification to Ohio EPA stating that all required permitconditions for the plan of study have been satisfied once these have been completed. In addition, thecertification must state that compliance with the WQBEL for mercury has not been achieved.Cadmium, Chromium +6 , Chromium, Copper, Free Cyanide, Lead, Nickel, Silver, Strontium, and ZincOhio EPA risk assessment (Table 9) places free cyanide and zinc in group 3 and the other parameters ingroup 2. This placement as well as the data in Tables 2 and 3 supports that these parameters do not havethe reasonable potential to contribute to WQS exceedances, and limits are not necessary to protect waterquality. However, all of these pollutants can be found in municipal wastewater effluent, and Ohio EPAguidance recommends that monitoring should continue for these parameters except strontium to documentthat concentrations remain at low levels. Strontium monitoring was discontinued in 2009 and itsplacement in group 2 indicates monitoring does not need to be reincorporated into the proposed permit.PhosphorusLimits for phosphorus have been continued from the existing permit and are based on requirements forLake Erie basin discharges (OAC 3745-33-06(C)).Water Temperature, Flow Rate, Nitrite + Nitrate, Total Kjeldahl Nitrogen, and Total Filterable ResidueMonitoring is proposed to continue for water temperature and flow rate. New monitoring is proposed fortotal filterable residue (total dissolved solids). Monitoring of these parameters is proposed to assist in theevaluation of effluent quality and treatment plant performance, and in accordance with Ohio EPAguidance.The draft 2012 Ohio Integrated Water Quality Monitoring and Assessment Report lists Maumee Bay asimpaired for aquatic life. Nutrients and organic enrichment/dissolved oxygen are listed as “highmagnitude” causes, and major municipal point sources are listed among the “high magnitude” sources.Considering this information and the fact that municipal wastewater treatment plants discharge a nutrientload to the lake, monthly monitoring for nitrate + nitrite and total Kjeldahl nitrogen (TKN) is proposedbased on BEJ. The purpose of the monitoring is to maintain a nutrient data set for use in the future totalmaximum daily load (TMDL) study.Bromodichloromethane, Chloroform, 1,2-Dichloroethylene, cis-1,2-Dichloroethylene,Tetrachloroethylene, and TrichloroethyleneThe Ohio EPA Risk Assessment (Table 9) places these parameters in group 2. This placement as well asthe data in Tables 2 and 3 supports that these parameters do not have reasonable potential to contribute toWQS exceedances, and limits are not necessary to protect water quality. Monitoring is not proposed forthese parameters.SludgeFact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-11-

Limits and monitoring requirements proposed for the disposal of sewage sludge by the followingmanagement practices are based on OAC 3745-40: land application, removal to sanitary landfill ortransfer to another facility with an NPDES permit.Whole Effluent Toxicity Reasonable PotentialEvaluating the acute toxicity results in Table 5 under the provisions of 40 CFR Part 132, Appendix F,Procedure 6, does not provide a PEQ value for either species because the test results were below thedetection limit. Reasonable potential for toxicity is not demonstrated. However, annual toxicity testing isproposed consistent with the minimum monitoring requirements at OAC 3754-33-07(B)(11). Theproposed monitoring will adequately characterize toxicity in the plant's effluent.Other RequirementsCompliance ScheduleA schedule of compliance (Part I.C) based on the SECAP and NFA is included in the permit.Pretreatment ProgramThe City of Oregon implements an Ohio EPA approved pretreatment program. The City of Oregonsubmitted an analysis and technical justification of local limits in January 2012. The requirements of thepretreatment program are included in Part II of the permit.Mercury VarianceA description of activities to be performed as part of the PMP is included in Part II, Item Z of the permit.Sanitary Sewer Overflow ReportingProvisions for reporting sanitary sewer overflows (SSOs) are proposed to continue in this permit. Theseprovisions include: the reporting of the system-wide number of SSO occurrences on monthly operatingreports; telephone notification of Ohio EPA and the local health department, and 5-day follow up writtenreports for certain high risk SSOs; and preparation of an annual report that is submitted to Ohio EPA andmade available to the public. Many of these provisions were already required under the “NoncomplianceNotification”, “Records Retention”, and “Facility Operation and Quality Control” general conditions inPart III of Ohio NPDES permits.Operator CertificationOperator certification requirements have been included in Part II, Item A of the permit in accordance withrules adopted in December 2006. These rules require the Oregon WWTP to have a Class IV wastewatertreatment plant operator in charge of the sewage treatment plant operations discharging through outfall001.Operator of RecordIn December 2006, Ohio Administrative Code rule revisions became effective which affect therequirements for certified operators for sewage collection systems and treatment works regulated underNPDES permits. Part II, Item A of this NPDES permit represents language necessary to implement rule3745-7-02 of the Ohio Administrative Code (OAC), and requires the permittee to designate one or moreoperator of record to oversee the technical operation of the sewerage system.Storm Water ComplianceParts IV, V, and VI have been included with the draft permit in order to ensure that any storm water flowsfrom the facility site are properly regulated and managed. As an alternative to complying with Parts IV,Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-12-

Table 2. Effluent Characterization Based on Self Monitoring DataSummary of current permit limits and unaltered monthly operating report (MOR) data for the Oregon WWTP outfalls 001, 300, 581, 601, and 602. All values arebased on annual records unless otherwise indicated. * = For pH, 5 th percentile shown in place of 50 th percentile; ** = For dissolved oxygen, 5 th percentile shown inplace of 95 th percentile; A = 7 day average. .Current PermitLimitsPercentilesParameter Season Units 30 day Daily # Obs. 50 th 95 th Data RangeOutfall 001Water Temperature Annual C MONITOR 1813 16.5 24 6.8-25Dissolved Oxygen Summer mg/l 5.0 minimum 641 8.5 9.4 5.4-10.1Dissolved Oxygen Winter mg/l 5.0 minimum 608 9.2 10.1 6.2-10.7Total Suspended Solids Annual mg/l 20 30 814 4 10 0-64Oil and Grease, Hexane ExtrMethod Annual mg/l 10 maximum 27 0 0 0-0Oil and Grease, Freon Extr-GravMeth Annual mg/l -- -- 32 0 0 0-0Nitrogen, Ammonia (NH3) Summer mg/l MONITOR 395 0.24 5.1 0-9.86Nitrogen, Ammonia (NH3) Winter mg/l MONITOR 235 0.11 1.27 0-3.9Nitrogen Kjeldahl, Total Annual mg/l MONITOR 27 1.4 2.55 0-4.3Nitrite Plus Nitrate, Total Annual mg/l MONITOR 60 5.8 10.6 1.3-12.8Phosphorus, Total (P) Annual mg/l 1.0 1.5 568 0.4 1.06 0-2.2Cyanide, Free Annual mg/l MONITOR 19 0 0.0008 0-0.008Nickel, Total Recoverable Annual ug/l MONITOR 19 0 0 0-0Silver, Total Recoverable Annual ug/l MONITOR 16 0 0 0-0Strontium, Total Recoverable Annual ug/l -- -- 10 2760 3190 2560-3190Zinc, Total Recoverable Annual ug/l MONITOR 20 27.5 38.3 21-44Cadmium, Total Recoverable Annual ug/l MONITOR 19 0 0 0-0Lead, Total Recoverable Annual ug/l MONITOR 19 0 0 0-0Chromium, Total Recoverable Annual ug/l MONITOR 19 0 0 0-0Copper, Total Recoverable Annual ug/l MONITOR 19 0 0 0-0Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-16-

Current PermitLimitsPercentilesParameter Season Units 30 day Daily # Obs. 50 th 95 th Data RangeChromium, Dissolved Hexavalent Annual ug/l MONITOR 19 0 0 0-0Fecal Coliform Annual #/100 ml -- -- 396 34 270 1-15000E. coli Annual #/100 ml 126 189 201 12 130 1-14000Flow Rate Summer MGD MONITOR 920 4.19 11.1 2.38-32.5Flow Rate Winter MGD MONITOR 906 6.16 18.7 2.05-35.1Flow Rate Annual MGD MONITOR 1826 4.93 16 2.05-35.1Chlorine, Total Residual Annual mg/l 0.038 maximum 642 0 0 0-0.1Mercury, Total (Low Level) Annual ng/l 1700 max 1.9 38 0.783 2.83 0-3.87Acute Toxicity, Ceriodaphnia dubia Annual TUa MONITOR 3 0 0 0-0Acute Toxicity, Pimephalespromelas Annual TUa MONITOR 3 0 0 0-0pH, Maximum Annual S.U. 9.0 564 7.6 7.8 7.2-8pH, Minimum Annual S.U. 6.5 564 7.5 7.7 7.1-7.8CBOD 5 day Summer mg/l 15 23 522 3 6 2-16CBOD 5 day Winter mg/l 15 23 494 3 6 0-12Outfall 300Overflow Occurrence Annual No./Month -- -- 31 0 0 0-0Outfall 581pH Annual S.U. 13 7 8.06 5.4-8.3Ammonia (NH3) In Sludge Annual mg/kg MONITOR 26 12200 32800 2270-36700Nitrogen Kjeldahl, Total In Sludge Annual mg/kg MONITOR 26 57400 78400 19700-84700Phosphorus, Total (P) Annual mg/l -- -- 7 25900 27300 22100-27400Phosphorus, Total In Sludge Annual mg/kg -- -- 7 31100 32100 23700-32300Arsenic, Total In Sludge Annual mg/kg 75 maximum 16 9.65 12 6.3-12.7Cadmium, Total In Sludge Annual mg/kg 85 maximum 16 1.7 2 1.2-2Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-17-

Current PermitLimitsPercentilesParameter Season Units 30 day Daily # Obs. 50 th 95 th Data RangeChromium, Total In Sludge Annual mg/kg -- -- 5 87 87.8 70-88Copper, Total In Sludge Annual mg/kg 4300 maximum 16 335 386 256-393Lead, Total In Sludge Annual mg/kg 840 maximum 16 46 65.5 1.3-79Nickel, Total In Sludge Annual mg/kg 420 maximum 16 27 30.3 21-31Zinc, Total In Sludge Annual mg/kg 7500 maximum 16 746 874 653-896Selenium, Total In Sludge Annual mg/kg 100 maximum 16 7.8 10.1 4.7-10.5Fecal Coliform in Sludge Annual MPN/G 2000000 maximum 7 3990 208000 0-260000Sludge Fee Weight Annual dry tons MONITOR 12 77 471 0-475Fecal Coliform in Sludge Annual CFU/gram -- -- 4 24000 84000 0-93000Sludge Weight Annual Dry Tons MONITOR 104 20.4 81.2 0-475Sludge Solids, Percent Total Annual % -- -- 92 3.44 4.65 1.7-8.3Sludge Solids, Percent Volatile Annual % -- -- 92 61 64.7 34.7-67.2Mercury, Total In Sludge Annual mg/kg 57 maximum 16 1.25 1.95 0.7-2.1Molybdenum In Sludge Annual mg/kg 75 maximum 13 14.2 16.3 9.7-16.52,3,7,8'-TCDD TTE, Total in Sludge Annual ng/kg -- -- 1 14 14 14-14Outfall 601pH Annual S.U. MONITOR 1249 7.6 7.8 6.6-8.8Total Suspended Solids Annual mg/l MONITOR 788 156 297 5.6-824Cyanide, Free Annual mg/l 11 0 3.01 0-6Cyanide, Total Annual mg/l MONITOR 9 0 0 0-0Nickel, Total Recoverable Annual ug/l MONITOR 20 0 5.4 0-13Silver, Total Recoverable Annual ug/l MONITOR 16 0 0 0-0Zinc, Total Recoverable Annual ug/l MONITOR 20 91.5 270 35-392Cadmium, Total Recoverable Annual ug/l MONITOR 20 0 0 0-0Lead, Total Recoverable Annual ug/l MONITOR 20 0 22.8 0-56Chromium, Total Recoverable Annual ug/l MONITOR 20 8 24.3 0-49Copper, Total Recoverable Annual ug/l MONITOR 20 29.5 145 11-171Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-18-

Current PermitLimitsPercentilesParameter Season Units 30 day Daily # Obs. 50 th 95 th Data RangeChromium, Dissolved Hexavalent Annual ug/l MONITOR 20 0 0 0-0Mercury, Total (Low Level) Annual ng/l MONITOR 38 44 118 9.4-194CBOD 5 day Summer mg/l MONITOR 429 166 262 17-372CBOD 5 day Winter mg/l MONITOR 412 122 236 0-574Outfall 602Bypass Occurrence Annual No./Day MONITOR 18 1 1 1-1Bypass Total Hours Per Day Annual Hrs/Day MONITOR 18 10.5 23.8 1-24Total Suspended Solids Annual mg/l MONITOR 18 37.5 60.6 11-64Bypass Volume Annual MGAL MONITOR 18 3.25 8.27 0.09-8.81CBOD 5 day Summer mg/l MONITOR 4 17.5 23.1 13-24CBOD 5 day Winter mg/l MONITOR 14 33 82 5-82Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-19-

Table 3. Projected Effluent Quality ValuesNumberofNumber> PEQ PEQParameter Units Samples MDL Average MaximumAmmonia-Summer mg/L 264 251 3.8153 7.2345Ammonia-Winter mg/L 117 101 0.25779 0.5712Bis(2-ethylhexyl)phthalate 1 µg/L 4 1 47.45 65Bromodichloromethane 1 µg/L 4 1 2.6572 3.64Cadmium µg/L 19 0 -- --Chloroform (Trichloromethane) 1 µg/L 4 3 8.1614 11.18Chlorine, total residual mg/L 642 1 0.0438 0.06Chromium µg/L 19 0 -- --Chromium +6 (dissolved) µg/L 19 0 -- --cis-1,2-Dichloroethylene 1 µg/L 4 2 2.4674 3.38Copper µg/L 19 0 -- --Cyanide, free mg/L 18 1 0.008176 0.0112Lead µg/L 19 0 -- --Mercury ng/L 38 27 2.184 3.5356Nickel µg/L 19 0 -- --Nitrate + Nitrite mg/L 60 60 9.3948 13.106Oil & grease mg/L 27 0 -- --Phosphorus mg/L 568 559 0.7117 1.215Silver µg/L 16 0 -- --Strontium µg/L 10 10 3201.6 3593.6Tetrachloroethylene 1 µg/L 4 3 18.4106 25.22Trichloroethylene 1 µg/L 4 1 3.796 5.2Zinc µg/L 24 24 34.779 41.4211,2-Dichloroethylene 1 µg/L 4 2 2.4674 3.381 = Data set from facility pretreatment programFact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-20-

Table 4. Station 602 Secondary Bypass Data for the Oregon WWTPMonitoring Station 602BypassTotal Suspended# of # BelowOccurrence Bypass Total Hours Bypass VolumeSolids CBOD 5Season Year Obs. Detection #/Day Hrs/day MGAL mg/L mg/LMean Maximum Mean Maximum Mean Maximum Mean MaximumSummer 2010 1 0 1 7.2 7.2 1.7 1.7 64.0 64.0 13.0 13.0Summer Overall 2010-2011 1 0 1 7.2 7.2 1.7 1.7 64.0 64.0 13.0 13.0Annual 2010 5 0 1 9.1 15.8 3.0 5.2 31.6 64.0 59.2 82.0Annual 2011 13 0 1 11.6 24.0 3.6 8.8 39.9 60.0 25.2 60.0Annual Overall 2010-2011 18 0 1 10.9 24.0 3.4 8.8 37.6 64.0 34.7 82.0Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-21-

Table 5. Summary of Acute Toxicity Test ResultsTest Date a Ceriodaphnia dubia 48 hours Fathead Minnows 96 hoursLC 50bTUa cLC 50bTUa c8/4/2009 >100 BD >100 BD8/18/2010 >100 BD >100 BD8/9/2011 >100 BD >100 BDa Entity testc TUa = acute toxicity unitsb LC 50 = median lethal concentration BD = below detectionFact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-22-

Table 6. Water Quality Criteria in the Study AreaOutside Mixing Zone CriteriaInsideAverage Maximum MixingHuman Agri- Aquatic Aquatic ZoneParameter Units Wildlife Health culture Life Life MaximumBis(2-ethylhexyl)phthalate µg/L -- 32 -- 8.4 1100 2100Bromodichloromethane µg/L -- 180 -- 340 3100 6200Cadmium µg/L -- 730 50 3.2 6.6 13Chloroform (Trichloromethane) µg/L -- 1700 -- 140 1300 2600Chlorine, total residual mg/L -- -- -- 0.011 0.019 0.038Chromium µg/L -- 14000 100 110 2400 4800Chromium +6 (dissolved) µg/L -- 14000 -- 11 16 31cis-1,2-Dichloroethylene µg/L -- 36000 -- -- -- --Copper µg/L -- 64000 500 12 19 38Cyanide, free mg/L -- 48 -- 0.0052 0.022 0.044Lead µg/L -- -- 100 9.9 190 380Mercury ng/L 1.3 3.1 10000 910 1700 3400Nickel µg/L -- 43000 200 69 620 1200Nitrate + Nitrite mg/L -- -- 100 -- -- --Oil & grease mg/L -- -- -- -- 10 --Phosphorus mg/L -- -- -- -- -- --Silver µg/L -- 11000 -- 1.3 2.9 5.7Strontium µg/L -- 1400000 -- 21000 40000 81000Tetrachloroethylene µg/L -- 1800 -- 53 430 850Trichloroethylene µg/L -- 370 -- 220 2000 4000Zinc µg/L -- 35000 25000 160 160 3201,2-Dichloroethylene µg/L -- -- -- 970 8800 18000Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-23-

Table 7. Instream Conditions and Discharger FlowParameter Units Season Value BasisHardness mg/L annual 140City of Oregon WWTP flow cfs annual 12.376Background Water QualityBis(2-ethylhexyl)phthalate µg/L 0Bromodichloromethane µg/L 0 No representative data available.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-24-STORET; 2010, 2011; n=1; 0

Parameter Units Season Value BasisStrontium µg/L 214STORET; 2010, 2011; n=15; 0

Table 8. Summary of Effluent Limits to Maintain Applicable Water Quality CriteriaOutside Mixing Zone CriteriaInsideAverage Maximum MixingHuman Agri- Aquatic Aquatic ZoneParameter Units Wildlife Health culture Life Life MaximumAmmonia-Summer mg/L -- -- -- -- -- --Ammonia-Winter mg/L -- -- -- -- -- --Bis(2-ethylhexyl)phthalate µg/L -- 352 -- 92 -- 2100Bromodichloromethane µg/L -- 1980 -- 3740 -- 6200Cadmium µg/L -- 8030 550 35 -- 13Chloroform (Trichloromethane) µg/L -- 18700 -- 1540 -- 2600Chlorine, total residual mg/L -- -- -- 0.12 -- 0.038Chromium µg/L -- 154000 1100 1210 -- 4800Chromium+6 (dissolved) µg/L -- 154000 -- 121 -- 31cis-1,2-Dichloroethylene µg/L -- 396000 -- -- -- --Copper µg/L -- 703979 5479 111 -- 38Cyanide, free mg/L -- 528 -- 0.057 -- 0.044Lead µg/L -- -- 1100 109 -- 380Mercury ng/L 1.3 3.1 10000 910 1700 3400Nickel µg/L -- 472975 2175 734 -- 1200Nitrate + Nitrite mg/L -- -- 1096 -- -- --Oil & grease mg/L -- -- -- -- -- --Phosphorus mg/L -- -- -- -- -- --Silver µg/L -- 121000 -- 14 -- 5.7Strontium µg/L -- 15397860 -- 228860 -- 81000Tetrachloroethylene µg/L -- 19800 -- 583 -- 850Trichloroethylene µg/L -- 4070 -- 2420 -- 4000Zinc µg/L -- 384950 274950 1710 -- 3201,2-Dichloroethylene µg/L -- -- -- 10670 -- 18000Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-26-

Table 9. Parameter Assessment for Outfall 001Group 1:Due to a lack of criteria, the following parameters could not be evaluated at this time.PhosphorusGroup 2:PEQ < 25 percent of WQS or all data below minimum detection limit. WLA not required. No limitrecommended; monitoring optional.Cadmium Chromium Chromium +6 (dissolved)Copper Lead NickelNitrate + Nitrite Oil & grease SilverChloroform (Trichloromethane) Bromodichloromethane Strontium1,2-Dichloroethylene cis-1,2-Dichloroethylene TrichloroethyleneGroup 3:PEQ max < 50 percent of maximum PEL and PEQ avg < 50 percent of average PEL. No limit recommended;monitoring optional.Cyanide, free Zinc TetrachloroethyleneGroup 4: PEQ max >= 50 percent, but < 100 percent of the maximum PEL or PEQ avg >= 50 percent, but < 100percent of the average PEL. Monitoring is appropriate.Bis(2-ethylhexyl)phthalateGroup 5:Maximum PEQ >= 100 percent of the maximum PEL or average PEQ >= 100 percent of the averagePEL, or either the average or maximum PEQ is between 75 and 100 percent of the PEL and certainconditions that increase the risk to the environment are present. Limit recommended.Limits to Protect Numeric Water Quality CriteriaRecommended Effluent LimitsParameter Units Period Average MaximumChlorine, total residual mg/L -- 0.038Mercury ng/L 1.3 1700PEL = preliminary effluent limitPEQ = projected effluent qualityWLA = wasteload allocationWQS = water quality standardsFact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-27-

Table 10. Final Effluent Limits and Monitoring Requirements for Outfall 001Effluent LimitsConcentration Loading (kg/day) a30 Day Daily 30 Day DailyParameter Units Average Maximum Average Maximum Basis bFlow MGD - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - M cTemperature NC - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/M cDissolved Oxygen mg/L - - - - - - - - - - -5.0 minimum - - - - - - - - - - - - - PD/EPCBOD 5 mg/L 15 23 d 454 696 d PD/EPSuspended Solids mg/L 20 30 d 606 908 d PD/EPNitrogen, Ammoniamg/LSummer - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/M cNitrite plus Nitrate mg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/M cNitrogen, Kjeldahl mg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/M cFilterable Residue, Total mg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - M cPhosphorus mg/L 1.0 1.5 d 30.5 45.4 d M c /PTSOil and Grease mg/L -- 10 -- -- EP/WQSpH S.U. - - - - - - - - - - - - - 6.5 to 9.0 - - - - - - - - - - - - - WQSE. coli #/100mL 126 284 d -- -- WQSChlorine Residual mg/L -- 0.038 -- -- EP/WLACyanide, Free mg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJCadmium µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJChromium µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJChromium +6 (dissolved) µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJCopper µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJLead µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJMercury ng/L 1.9 1700 0.0000575 0.0515 VARNickel µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJSilver µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJZinc µg/L - - - - - - - - - - - - Monitor - - - - - - - - - - - - - - - EP/BPJWhole EffluentToxicityAcute TU a - - - - - - - - Monitor (w/o trigger) - - - - - - - - - - EP/WETaEffluent loadings based on average design discharge flow of 8 MGD.bDefinitions: ABS = Antibacksliding Rule (OAC 3745-33-05(E) and 40 CFR Part 122.44(l))AD = Antidegradation (OAC 3745-1-05)BPJ = Best Professional JudgmentBPT = Best Practicable Waste Treatment Technology, 40 CFR Part 133, Secondary TreatmentRegulationEP = Existing PermitM = Permit Guidance 2: Determination of Sampling Frequency Formula for Industrial WasteFact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-28-

DischargesPD = Plant Design CriteriaPTS = Phosphorus Treatment Standards (OAC 3745-33-06 (C))RP = Reasonable Potential for requiring water quality-based effluent limits and monitoringrequirements in NPDES permits (3745-33-07(A))VAR = Mercury variance (OAC 3745-33-07(D)(10)(a))WET = Whole Effluent Toxicity (OAC 3745-33-07(B))WLA = Wasteload Allocation procedures (OAC 3745-2)WLA/IMZM = Wasteload Allocation limited by Inside Mixing Zone MaximumWQS = Ohio Water Quality Standards (OAC 3745-1)cdMonitoring of flow and other indicator parameters is specified to assist in the evaluation of effluent quality andtreatment plant performance.7 day average limit.Fact Sheet for NPDES Permit Renewal, Oregon WWTP, 2012-29-