Document 3ebR903bxaYGGy85o7vXeGoGa

EPA Inspection Report - Page 1 of 8 Region 6 Compliance Assurance and Enforcement Division INSPECTION REPORT Inspection Date(s): Media: Regulatory Program(s) 11/29/2017 Water CWA - NPDES Company Name: Facility Name: Facility Physical Location: (city, state, zip code) Mailing address: (city, state, zip code) County/Parish: Facility Contact: City of Rio Rancho Rio Rancho WWTP #2 100 Industrial Park Loop Rio Rancho, NM 87124 3200 Civic Center Circle Rio Rancho, NM 87144 Sandoval County Jim Chiasson jchiasson@rrnm.gov FRS Number: Identification/Permit Number: Media Number: NAICS: SIC: 110022872346 NM0027987 22132 4952 Personnel participating in inspection: Amy Andrews US EPA, 6EN-WM Sandra Gabaldn NMED SWQB, Point Source Regulation Section Daniel Valenta NMED SWQB, Point Source Regulation Section Edward De Lara Jr. CH2M, City of Rio Rancho WWTP #2 Bill Jaquez CH2M, City of Rio Rancho WWTP #2 Gene Garcia CH2M, City of Rio Rancho WWTP #2 Director of Utilities Inspector Inspector Inspector Operations Manager Wastewater Compliance Manager Operations Supervisor (214) 907-0638 (505) 827-1041 (505) 827-2575 (505) 891-5022 (505) 891-5024 EPA Lead Inspector Signature/Date Supervisor Signature/Date AMY ANDREWS Amy Andrews Digitally signed by AMY ANDREWS DN: c=US, o=U.S. Government, ou=USEPA, ou=Staff, cn=AMY ANDREWS, dnQualifier=0000131170 Date: 2018.04.09 12:18:32 -06'00' Date CAROL PETERS-WAGNON Carol Peters Digitally signed by CAROL PETERS-WAGNON DN: c=US, o=U.S. Government, ou=USEPA, ou=Staff, cn=CAROL PETERS-WAGNON, dnQualifier=0000009981 Date: 2018.04.09 15:07:06 -05'00' Date 6ENFORM-019-R7 (2/15/2017) 1 EPA Inspection Report - Page 2 of 8 Section I - INTRODUCTION City of Rio Rancho Wastewater Treatment Plant #2 Inspection Date 11/29/2017 PURPOSE OF THE INSPECTION United States Environmental Protection Agency (EPA) Region 6 inspector, Amy Andrews, and New Mexico Environment Department (NMED) inspectors Sandra Gabaldon and Daniel Valenta arrived at the City of Rio Rancho Wastewater Treatment Plant (WWTP) #2 at 9:15am on November 29, 2017 for an unannounced Compliance Evaluation Inspection (CEI). We met with Edward De Lara Jr., Wastewater Operations Manager, and Bill Jaquez, Compliance Manager, for the Opening Conference. I presented my credentials to Mr. De Lara and Mr. Jaquez, and informed them that this was an EPA inspection to determine the WWTP's compliance under the Clean Water Act (CWA). This CEI was conducted under the authority of the National Pollutant Discharge Elimination System (NPDES) permit program, in accordance with the CWA. The generation of this report is based on information supplied by Rio Rancho WWTP representatives, observations made by the EPA and NMED inspectors, and records and reports maintained by the permittee (Rio Rancho WWTP), and the EPA. FACILITY DESCRIPTION The City of Rio Rancho WWTP#2 is classified as a major municipal discharger with a pre-treatment program, permitted for 8.2 million gallons per day (MGD) of discharge, with a current facility design flow of 5.5 MGD, and an average actual flow of 3.6 MGD. Discharge is into the Rio Grande River, located at Latitude 35 15' 23" North and Longitude 106 35' 32" West. The facility has two full time operators and two supervisors in addition to a total of eight operators shared between all the City of Rio Rancho WWTPs who also take turns responding to the on-call SCADA system. WWTP#2 is one of five WWTPs owned by the City of Rio Rancho (see Appendix 1, WWTP Flow Diagram). Outfall 001, the outfall from WWTP#2, is the only outfall currently discharging under an NPDES permit. WWTP#3 has an NPDES Permit which is maintained for potential future discharge, however the plant has been offline since 2004 and all waste streams are diverted to the influent flow at WWTP#2 (WWTP#3 currently has no discharge). The effluent waste streams from WWTP#1 and WWTP#6 are covered under the NPDES permit for WWTP#2 and are discharged at Outfall 001 seasonally. During the warmer months the effluent from WWTP#1 is used to water golf courses and parks, and during the colder months, when not seasonally reused, the effluent is sent to WWTP#2. The WWTP#1 effluent is combined with the WWTP#2 effluent prior to the ultraviolet (UV) disinfection system and becomes part of the WWTP#2 effluent flow leaving the system at Outfall 001. As of the summer of 2017, effluent from WWTP#5 is being used to recharge the aquifer with recycled water via injection well; wastewater is not discharged to surface waters. Effluent from WWTP#6 is usually also sent to the injection well, however if the injection system is down the effluent is sent to WWTP#2, and joins with the effluent leaving the facility through Outfall 001, after the WWTP#2 UV system and flow meter. There are a total of 27 lift stations that bring wastewater from residential and industrial users to WWTP#2. All main lift stations are equipped with permanent generators in case of power failure, and 2 EPA Inspection Report - Page 3 of 8 City of Rio Rancho Wastewater Treatment Plant #2 Inspection Date 11/29/2017 portable generators are available for use at the remaining smaller lift stations in case of emergency. WWTP#2 consists of two separate treatment streams. 2A is a Schreiber Process Unit that was built in 1995, with a bar screen, aeration basin and clarifier basin. 2B has approximately twice the capacity of 2A, and is an activated sludge treatment process with an automatic grit belt and climber screen system, anoxic basins, fine bubble aeration basins, and clarifiers. Both treatment streams join back together prior to the ultraviolet (UV) disinfection system Section II - OBSERVATIONS We began the inspection with a tour of the WWTP. Both treatment streams appeared to be operating within normal parameters, however the aeration basin of 2B did have a broken pipe in the fine bubble aeration basin. The influent waste stream is spilt to each of the treatment streams on a percent (%) basis (as an example, 30% might go to 2A and 70% might go to 2B). Influent samples are collected just after the bar screen of 2A and at the headworks of 2B. The influent is assumed to be identical at each treatment stream, and even though influent samples are collected at both treatment streams, only the influent samples from 2B are used for reporting on DMRs. A sewage odor was noted around the facility, and was explained to be originating from Lift Station 14.2, which is the main lift station just prior to entrance into the WWTP. The odor comes primarily from grease issues at this lift station, and the facility has plans to implement odor control measures at this lift station in the near future. The UV disinfection system has approximately 400 UV bulbs, and the upkeep on the system has become tedious to keep up with. Rio Rancho has allocated $2.2 Million to replace the entire system, which is scheduled for around the middle of 2019. A tour of the laboratory showed that samples run by the facility include pH (run daily), biochemical oxygen demand (BOD; run 5 days/week), total suspended solids (TSS; run 5 days/week), total residual chlorine (TRC; run daily when chlorine has been in use at the facility). Whole Effluent Toxicity testing is sent to Sage Environmental in Oklahoma City, Oklahoma, and all other testing is sent to Hall Environmental, in Albuquerque, New Mexico. Section III - AREAS OF CONCERN Requirement NPDES Permit NM0027987, Part I: Requirements for NPDES Permits, A. Limitations and Monitoring Requirements, 1A. Effluent limits for Outfall 001 list a Minimum % Removal for BOD5 and TSS equal to 85% or greater. NPDES Permit NM0027987, Part III: Standard Conditions, C.3. Representative Sampling: Samples and measurements taken for the purpose of monitoring shall be representative of the monitoring activity. 3 EPA Inspection Report - Page 4 of 8 City of Rio Rancho Wastewater Treatment Plant #2 Inspection Date 11/29/2017 Concern Permit requirements include sampling effluents from WWTP #1 and #6 at internal outfalls prior to comingling with effluent from WWTP#2, however they do not state a specific requirement for sampling of influent locations. The percent removal requirement necessitates sampling of influent for comparison to effluent. Facility personnel stated that influent samples are collected from treatment stream 2A and 2B, but that only the samples from stream 2B are used to calculate % removal compared to effluent. Note that the effluent from WWTP#1 joins with the effluent from WWTP#2 prior to the effluent sampling, and therefore a custom formula has been provided for % removal. Facility personnel stated that because influent streams 2A and 2B are split from the same stream, they should be approximately equivalent. The inspector was unable to conclusively verify that these streams are equivalent, using data from October 2017 (see Appendix 2 for calculations), and that stream 2B is representative of all influent at WWTP#2. Section IV - FOLLOW UP The following information was received by EPA after exiting the Facility on 11/29/2017: 2/9,12/2018; follow-up email correspondence with Mr. Jaquez containing daily flow data for the month of October 2017 and clarification on connection of effluents from WWTP#1 and WWTP#6. Section V - LIST OF APPENDICES Appendix 1 - WWTP Flow Diagram Appendix 2 - Comparison Calculations of WWTP#2 Influent Streams 2A and 2B; October 2017 4 EPA Inspection Report - Page 5 of 8 City of Rio Rancho Wastewater Treatment Plant #2 Inspection Date 11/29/2017 Appendix 1 WWTP Flow Diagram EPA Inspection Report - Page 6 of 8 EPA Inspection Report - Page 7 of 8 City of Rio Rancho Wastewater Treatment Plant #2 Inspection Date 11/29/2017 Appendix 2 Comparison Calculations of WWTP#2 Influent Streams 2A and 2B; October 2017 EPA Inspection Report - Page 8 of 8 Comparison Calculations of WWTP #2 Influent Streams 2A and 2B - October 2017 Date 1-Oct 2-Oct 3-Oct 4-Oct 5-Oct 6-Oct 7-Oct 8-Oct 9-Oct 10-Oct 11-Oct 12-Oct 13-Oct 14-Oct 15-Oct 16-Oct 17-Oct 18-Oct 19-Oct 20-Oct 21-Oct 22-Oct 23-Oct 24-Oct 25-Oct 26-Oct 27-Oct 28-Oct 29-Oct 30-Oct 31-Oct Flow (MGD) INF 2B INF 2A WWTP#2 EFF 1.547 1.46 4.806 1.553 1.46 4.431 1.7 1.46 4.2 1.658 1.48 4.228 1.699 1.49 4.346 1.69 1.47 4.155 1.88 1.49 3.955 1.46 1.46 4.001 1.522 1.5 4.081 1.533 1.49 3.879 1.577 1.5 3.666 1.582 1.52 3.774 1.556 1.51 3.707 1.535 1.49 3.608 1.585 1.49 4.009 1.45 1.47 4.92 1.457 1.45 4.308 1.503 1.42 4.153 1.63 1.44 4.135 1.67 1.41 4.073 1.668 1.39 3.988 1.691 1.39 4.075 1.658 1.45 4.459 1.654 1.43 4.232 1.676 1.43 4.013 1.684 1.43 4.062 1.684 1.41 4.084 1.681 1.43 3.875 1.699 1.43 4.033 1.938 1.44 4.445 1.701 1.43 4.114 BOD (mg/L) INF 2B INF 2A WWTP#2 EFF 250.0 370.0 4.4 310.0 480.0 4.6 310.0 340.0 4.3 280.0 330.0 3.5 250.0 240.0 3.6 260.0 310.0 2.9 280.0 280.0 4.3 330.0 340.0 3.6 290.0 320.0 2.8 270.0 260.0 2.3 240.0 260.0 3.8 260.0 350.0 3.3 340.0 360.0 3.2 330.0 230.0 3.2 330.0 340.0 4.2 380.0 320.0 4.2 270.0 310.0 3.4 260.0 270.0 2.8 420.0 340.0 3.6 400.0 440.0 4.1 270.0 230.0 4.1 270.0 220.0 2.6 310.0 250.0 3.3 BOD Loading (lbs/day)* INF 2B INF 2A WWTP#2 EFF 3227.4 4508.0 176.5 4017.5 5848.2 170.1 4397.8 4142.5 150.7 3874.1 4075.7 123.5 3544.5 2984.2 130.6 3167.8 3556.3 4221.7 3816.4 3564.5 3776.9 3504.9 4227.6 4005.6 3297.9 96.8 146.4 116.5 85.7 72.4 3174.4 3146.1 4133.9 4139.0 4488.8 3232.9 4293.5 4356.1 2725.5 4085.7 127.1 135.5 115.0 110.9 144.9 5362.3 3735.7 3588.7 5874.2 5621.2 3711.9 3751.1 3222.0 4057.3 5250.7 142.8 126.5 98.9 120.6 139.0 3828.1 4366.6 4400.4 2744.7 2643.7 2983.3 138.0 96.4 113.3 INF 2B 275.0 252.1 247.4 270.8 240.0 TSS (mg/L) INF 2A 814.3 385.7 230.4 350.0 243.0 WWTP#2 EFF 9.6 7.4 6.4 7.2 9.0 310.0 221.7 6.2 251.0 241.7 6.0 366.6 230.4 4.6 286.5 234.8 6.0 252.2 278.9 4.6 282.0 290.5 6.6 275.0 259.1 5.2 313.0 340.9 6.6 320.4 209.1 6.8 297.7 242.9 6.4 280.0 221.7 7.0 288.0 204.4 8.2 314.3 220.0 6.2 456.8 373.9 6.2 406.8 265.2 6.6 397.9 236.8 7.8 1575.0 257.1 5.2 280.0 239.1 5.8 30 day avg* % removal* 2.197 1.962 5.557 300.4 312.6 3.6 4054.2 3801.3 125.1 358.2 286.6 6.6 98.8 98.9 98.2 97.7 7 day avg - wk1* 7 day avg - wk2* 7 day avg - wk3* 7 day avg - wk4* 7 day avg - wk5* 1.675 1.473 4.303 280.0 352.0 4.1 3812.3 4311.7 150.3 257.1 404.7 7.9 1.538 1.496 3.817 286.0 302.0 3.2 3665.3 3762.6 103.6 293.3 241.5 5.5 1.566 1.439 4.227 300.0 308.0 3.5 3816.5 3738.7 126.7 297.6 268.5 6.3 1.675 1.424 4.114 346.0 336.0 3.6 4836.4 3998.6 125.6 349.2 257.0 6.8 1.779 1.433 4.197 283.3 233.3 3.3 4198.4 2790.6 115.9 751.0 244.3 6.3 *Note that these calculations are for comparison purposes only, and because they do not account for WWTP#1, they will not match reported DMR values. TSS Loading (lbs/day)* INF 2B INF 2A WWTP#2 EFF 3550.2 9921.2 385.0 3267.2 4699.3 273.6 3509.7 2807.1 224.3 3746.8 4322.7 254.0 3402.8 3021.5 326.4 3776.9 3188.0 4689.9 3770.4 3329.5 2701.1 3025.5 2864.8 2939.1 3537.7 207.0 204.3 148.9 183.6 144.9 3730.0 3327.6 3805.7 4018.6 4049.4 3612.1 3178.4 4125.0 2477.8 2918.9 220.8 213.5 237.3 235.7 220.8 3951.2 3984.8 4338.2 6388.9 5716.8 2571.6 2473.3 2625.3 4461.9 3164.7 238.0 305.1 219.0 207.6 223.7 5641.5 25471.9 3974.6 4983.9 2825.8 3089.5 2853.3 3487.7 262.5 192.9 199.1 231.7 3495.3 3750.9 3786.2 4876.0 11696.0 4954.3 3013.6 3262.4 3059.4 2922.9 292.7 177.7 225.6 238.7 218.2