2017 wastewater treatment plant annual report

City of Paso Robles

CITY OF EL PASO DE ROBLES WASTEWATER TREATMENT PLANT 2017 ANNUAL REPORT

C i t y o f P a s o R o b l e s 3 2 0 0 S u l p h u r S p r i n g s R o a d

P a s o R o b l e s , C a l i f . 8 0 5 - 2 3 7 - 3 8 6 5

1 / 2 9 / 2 0 1 8

Andy Mark, Technical Supervisor II S u b m i t t e d t o t h e C e n t r a l C o a s t R e g i o n a l W a t e r Q u a l i t y C o n t r o l B o a r d O r d e r N o . R 3 - 2 0 1 1 0 0 0 2 N P D E S N o C A 0 0 4 7 9 5 3

City of Paso Robles

City of Paso Robles 2017 Annual Wastewater Report

1. Introduction ............................................................................................................................................................. 1

2. Summary .................................................................................................................................................................. 1

3. OPERATIONS ............................................................................................................................................................ 2

Influent Treatment and Quality ............................................................................................................................ 2

Preliminary Treatment ......................................................................................................................................... 2

Primary Treatment ............................................................................................................................................... 2

WAS Equalization/DAFT ........................................................................................................................................ 2

Biological Nutrient Removal/Secondary Treatment .............................................................................................. 3

Final Effluent Treatment and Quality .................................................................................................................... 4

Solids Handling ..................................................................................................................................................... 8

4. Plant Maintenance Summary ................................................................................................................................... 9

Plant Maintenance Summary ................................................................................................................................ 9

Additional Monthly Maintenance & Repairs Other Than PM’s on Plant Equipment: .............................................. 9

5. CHEMICALS AND UTILITIES ......................................................................................................................................12

6. WWTP STAFFING .....................................................................................................................................................12

Operations Staffing..............................................................................................................................................12

Staff Training & Development..............................................................................................................................12

Operator Certification .........................................................................................................................................13

7. Wastewater Laboratory Analysis and Instrument Upkeep .......................................................................................13

8. Pretreatment ..........................................................................................................................................................14

9. Certification of Report .............................................................................................................................................16

Appendix A .....................................................................................................................................................................17

Performance Charts ....................................................................................................................................................17

City of Paso Robles

List of Tables

Table 1: Influent Parameters ................................................................................................................................... 2

Table 2: Primary Treatment Effluent Parameters ................................................................................................... 3

Table 3: Primary Effluent, BNR and Secondary Effluent Averages for 2017 ............................................................ 3

Table 4: Treated Wastewater Parameters 2017 ...................................................................................................... 4

Table 5: Key Treatment Parameters 2017 ............................................................................................................... 5

Table 6: Bio-solids Quality Monitoring 2017 ............................................................................................................ 8

Table 7: Plant Maintenance Frequency ................................................................................................................... 9

Table 8: Chemicals .................................................................................................................................................12

Table 9: Utilities .....................................................................................................................................................12

Table 10: Plant Staffing ..........................................................................................................................................12

Table 11: Wastewater Treatment Certification ......................................................................................................13

City of Paso Robles

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1. Introduction The Paso Robles Wastewater Treatment Plant (WWTP) is owned and operated by the City of Paso Robles. The WWTP is located at 3200 Sulphur Springs Road, Paso Robles, San Luis Obispo County, California. The treatment plant serves a population of approximately 31,000 people including Templeton Community Services District (TCSD). The newly upgraded treatment process went on line in April 2015. Plant staff continues to learn, adjust and refine the overall process control of the facility to ensure the plant is meeting the stringent discharge limits set forth in the NPDES permit. Treatment plant processes include preliminary screening and grit removal, primary clarification, dissolved air flotation sludge thickening (DAFT), anaerobic sludge digestion, cogeneration, solids dewatering, 3 stage Biological Nutrient Removal (BNR) process with internal recycle, secondary clarification with return activated sludge (RAS), chlorine contact basin (CCB) with the addition of sodium hypochlorite and ammonium sulfate to form chloramines to reduce formation of trihalomethanes (THM’s), and the addition of sodium bisulfite for dechlorination. Treated effluent is currently discharged via a polishing channel into the Salinas River. Numerous auxiliary systems are required for proper operation of many plant processes including; process water, HVAC, electrical power distribution, natural gas, methane gas, chemicals, instrument air and others.

The State Water Resources Control Board (SWRCB) has classified the Paso Robles WWTP as a Class III Secondary Treatment wastewater treatment facility. The facility currently operates under Order No. R3-2011-0002 issued by the Central Coast Regional Water Quality Control Board. The Paso Robles WWTP is currently in construction of a new Tertiary Treatment Facilities, which include cloth media filtration and ultraviolet (UV) light disinfection. This project is scheduled to be completed in December 2018.

This report is a summary of the overall plant operation and performance for the year of 2017. The report contains summaries of plant operations and performance, maintenance, laboratory, chemicals, utilities, and staffing. Any and all permit violations (effluent total nitrogen, chlorine residual, coliform, etc.) have been previously self-reported via monthly, or quarterly reports throughout the 2017 year.

2. Summary With just over 2.5 years of operation since the complete upgrade of the wastewater treatment process, plant performance continues to increase and develop as plant staff’s knowledge and experience with the new equipment continues to grow. The final effluent biochemical oxygen demand (BOD) averaged 4.25 mg/L and the final effluent total suspended solids (TSS) averaged 3.97 mg/L for all of 2017. This is excellent treatment performance.

2017 began with the DAFT off-line until February 21, which meant all waste sludge, scum and primary sludge was co-settled in the primary clarifier before being pumped directly to the anaerobic digesters. During the summer months, the plant had challenges with heat related communication power fail issues. In July the Mid-State Fair comes to town, which increases flow to the WWTP. Longtime Chief Plant Operator Chris Slater retired in fall 2017. As a result of regular microscopic and visual evaluations of our biological process, septage receiving was shutdown periodically throughout the year to maintain the health of the biological process and minimize filamentous bacteria growth.

The Paso Robles WWTP does not have flow equalization basins, so flow fluctuates greatly between night and day. Average dry weather flow for 2017 was 2.35 million gallons per day (MGD), but nighttime flows occasionally dipped down as low as 0.4 MGD. These kind of flow fluctuations create operational challenges, but the plant’s exceptional staff reduced problems to a minimum with proper process control adjustments.

In June, the City began construction of its $14.4 million Tertiary Treatment Facilities project at the WWTP. These facilities include cloth media filtration, UV disinfection, recycled water pond and pump station, and a new maintenance shop. Construction of these new facilities will be substantially complete in December 2018. These

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facilities will produce tertiary quality recycled water that is suitable for unrestricted spray irrigation. The City also completed preliminary design of a recycled water distribution system, to deliver the recycled water to east Paso Robles, where it will be used to irrigate golf courses, parks, and vineyards. Final design of the recycled water distribution system will be completed in 2018.

3. OPERATIONS

Influent Treatment and Quality The plant operates at an average dry weather flow of 2.35 MGD. During wet weather, such as the exceptionally wet month of January 2017, instantaneous flows peaked as high as 8.84 MGD. This is well below the WWTP wet weather flow capacity of 12.7 MGD. A summary of annual flow and influent parameter concentrations for past four years is shown in Table 1. During the last five years there has been a 19% reduction in daily and 17% in annual plant influent flows due to drought and water conservation. The new plant now has both Influent flow meter and an effluent flow meter to adequately measure flow in to and out of the plant.

Table 1: Influent Parameters

2013 2014 2015 2016 2017 Mean Influent flow, MGD 2.83 2.44 2.4 2.3 2.35

Total Annual flow. MG 1035 975 879 868 859.47

Mean Influent SS, mg/L 287 304 412 427 342

Mean Influent BOD, mg/L 351 414 336 320 327

Preliminary Treatment The preliminary treatment process includes two new climber screens, washer / compactor and a vortex grit removal system along with influent flow measurement. Wastewater enters the plant from two different trunk lines, one from the older west side of town and one from the newer east side of town. Two new climber screens remove the larger pieces of debris and inorganics from the wastewater stream. That debris travels through a washer /compactor and into a grit bin for disposal. The remaining grit is removed in the vortex removal system and also deposited into the grit bin and hauled to a sanitary landfill site.

Primary Treatment After grit removal, the waste stream flows through a primary splitter box which divides fl to two primary clarifiers where velocity of the flow is reduced and sedimentation occurs. Utilizing both surface and bottom sludge collectors the settled primary sludge and the surface scum are removed and pumped to Digester #3 where the sludge and scum are broken down further through a process called anaerobic digestion. In 2017, the City typically operated only one of the two primary clarifiers at a time, to ensure adequate waste passed on to properly feed the biological nutrient removal process.

WAS Equalization/DAFT Waste activated sludge (WAS) and secondary scum are feed to the WAS equalization box. From there, solids are fed to a Dissolved Air Flotation Thickener (DAFT) where sludge is thickened and floated to the surface of and skimmed into a sludge hopper. The thickened sludge is then pumped to anaerobic digestion. Table 2 contains a summary of key primary treatment effluent parameter concentrations over the previous three years.

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Table 2: Primary Treatment Effluent Parameters

2014 2015 2016 2017

Mean Primary Effluent SS, mg/L 90 *83 94 100.4

Mean Primary Eff. SS % removal 73 *80 23 29

Mean Primary Eff. BOD, mg/L 195 *234 150 186.7

Mean Primary Eff. BOD, % removal 47 *35 49 57

Biological Nutrient Removal/Secondary Treatment The secondary treatment process includes biological treatment of the waste stream as well as a solids separation process. In the activated sludge BNR process, effluent from the primary clarifiers is mixed with Return Activated Sludge (RAS) from secondary clarifiers and is aerated in aeration basins. The activated sludge is primarily comprised of micro-organisms and bacteria, which are a natural part of wastewater and are used to break down the organic solids in the wastewater. Micro-organisms are monitored microscopically weekly by operations and laboratory staff to confirm the number, type, and general health of the process.

A mixed liquor recycle return system allows denitrification in the anoxic zones (2) for removal of nitrate from the waste stream and to recover alkalinity lost during the nitrification process

The mixed liquor from the aeration basins flows to, two of three large secondary clarifiers where the activated sludge is allowed to settle. Only two of the three clarifiers are operated at this time. A controlled quantity of this sludge is “returned” to the aeration basins as Returned Activated Sludge (RAS) to repeat the treatment process, and excess quantities are removed as Waste Activated Sludge (WAS) to the WAS equalization tank. The number of clarifiers in operation is adjusted to optimize performance during varying flow conditions.

Table 3: Primary Effluent, BNR and Secondary Effluent Averages for 2017

Mean Aeration Loading mg/L & lbs. TSS/day 99.4 mg/L/day 2171 lbs./day

Mean Aeration Loading BOD (mg/L & lbs./day) 192 mg/L day 4145 lbs./ day

Mean Aeration Ammonia Loading (mg/L/day) 54.9 mg/day 1198 lbs. / day

Mean Mixed Liquor Suspended Solids (mg/L) For Aeration Basins 1 & 2 2530 mg/L

Mean SRT (days) 5.0

Mean RAS concentration (mg/L /day) 6262 mg/L

Mean Secondary Effluent Ammonia, mg/L/day 1.644 mg/L 35 lbs. / day

Mean Secondary Effluent TSS,(mg/L & lbs. /day 6.8 mg/L 146 lbs. / day

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Final Effluent Treatment and Quality Sodium Hypo Chlorite (chlorine) is combined with ammonium sulfate to form chloramines, which are used to disinfect the final effluent before it is discharged. Ammonia is fed into the chlorine feed water at a carefully controlled dosage to limit the formation of disinfection byproducts, specifically trihalomethanes (THM’s). The water then flows through two Chlorine Contact Basins (CCB) to allow for enough contact time so that complete disinfection will transpire. At the discharge end of the CCB, Sodium Bisulfite is added to the CCB effluent for de-chlorination. The discharge stream then flows through a polishing channel over rocks and through pools to help volatize off any remaining byproducts or chlorine residual and to maintain an adequate Dissolved Oxygen level in the effluent discharge. A summary of key final effluent parameters for 2017 is shown in Table 4. Details of the final effluent qualities are presented in graphical form in Appendix A. A summary of other key treatment parameters for 2017 is shown in Table 5.

Table 4: Treated Wastewater Parameters 2017

Quarterly January April July October

Ammonia Nitrogen (mg/L) 3.59 3.38 3.00 3.610

Unionized Ammonia Nitrogen (mg/L) 0.0286 ND 0.0618 0.0545

Nitrate as nitrogen (mg/L) 6.9 9.7 8.3 4.70

Copper (mg/L) 0.0157 0.0111 .0114 0.0078

Dichlorobromomethane (µg/L) 0.461 0.449 0.544 0.788

Dibromochloromethane (µg/L) ND ND ND ND

pH 7.35 7.39 7.58 7.52

Total Nitrogen as N (mg/L) 10.7 14.4 12.00 8.09

Selenium (mg/L) 0.00517 0.0546 0.003640 0.00467

Bis(2-Ethlhexyl)phthalate (µg/L) ND 1.280 0.487 ND

Acute Toxicity Pass Pass Pass Pass

Chronic Toxicity (TUc) 1 1 1 1

Total Hardness CaCO3 (mg/L) 274 238 203 302

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Table 5: Key Treatment Parameters 2017

EFFLUENT BOD mg/L

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Max 6.8 10.3 8.6 9.3 5.5 9.2 3.34 6.20 3.41 3.38 7.9 4.93

Mean 5.35 7.23 4.54 5.26 3.52 4.73 2.74 3.36 2.70 2.75 4.82 4.03

Average lbs./day 123 158 93 109 74 99 58 70 58 58 103 82

Influent BOD, mg/L


Max 530 472 401 402 448 341 365 455 400 424 415 476

Mean 337 369 366 333 337 264 273 333 320 341 306 357

Average lbs./day 7308 8032 6929 6360 6324 5064 5350 6256 6405 6655 5895 6580

Influent TSS, mg/L


Max 436 474 440 697 568 438 330 1001

382 409 408 386

Mean 331.5 370 380 433.25 408 231.25 164.75 461.8 337 365 304.4 277.25

Average lbs./day 7188 8054 7194 8274 7656 4436 3229 9051 6745 7336 5940 5364

Effluent TSS, mg/L


Max 6.6 17.0 5.8 6.90 6.8 5.2 3.8 4.7 4.7 3.4 8.20 4.7

Mean 5.1 7.5 3.0 6.55 5.04 3.76 2.93 2.62 2.78 2.60 4.92 3.45

Average lbs./day 117.5 158.37 61.4 135 105 78.89 62.27 55.23 70 55.16 106.32 70.8

Influent Flow, MG


Max 3.56 3.31 2.39 2.47 2.44 2.39 2.53 2.49 2.57 2.47 2.43 2.37

Mean 2.60 2.61 2.27 2.29 2.25 2.3 2.35 2.35 2.40 2.34 2.31 2.21

Total 80.68 73.12 70.34 68.81 69.79 68.96 72.89 72.74 71.9 72.41 69.23 68.60

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Effluent Flow, MG


Max 3.80 3.58 2.62 2.70 2.63 2.42 2.74 2.70 2.79 2.72 2.72 2.62

Mean 2.77 2.8 2.49 2.51 2.52 2.35 2.56 2.56 2.60 2.58 2.57 2.47

Total 85.82 78.49 77.06 75.4 75.48 69.88 79.29 79.35 77.97 79.89 77.2 75.9

Settleable Solids mL/L


Max <.1 <.1 <.1 <.1 <.5 <.1 <.1 <.1 <.1 <.1 <.1 <.1

Mean <.1 <.1 <.1 <.1 0.18 <.1 <.1 <.1 <.1 <.1 <.1 <.1

Total Coliform, MPN/100


Max 79 33 7.8 920 49 804 4.5 7.8 13 130 >1600 1600

Mean 13.6 7.5 4 120.6 9 102.1 2.5 2.8 3.6 17.1 204.9 239.8

7-day MPN (23) avg.

9.1 7.7 2.1 3.6 <1.9 2.6 4 1.9 2 2 3.1 6.0

Effluent pH


Max pH 7.6 7.56 7.57 7.56 7.81 7.76 7.60 7.90 7.92 7.70 7.72 7.63

Min pH 7.27 7.26 7.38 7.44 7.48 7.54 7.33 7.65 7.68 7.60 7.55 7.49

Effluent Chlorine Residual, mg/L


Max *0.6 .04 .03 .03 .03 .04 .03 .04 .04 .06 .03 .04

Min .02 .02 .03 .02 .02 .03 .02 .01 .025 .02 .02 .02

Mixed Liquor Concentration, mg/L


Max 2854 3158 3052 3002 4276 4304 4124 2626 2174 2300 2502 2644

Mean 2511 2960 2876 2382 2642 3953 2381 2193 1975 2157 2164 2223

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RAS TSS Concentration, mg/L


Max 8880 8820 8892 7364 11088 12524 9792 5852 5448 5952 5992 6888

Min 4140 5552 6412 3800 5504 8360 4240 4316 3792 4112 4492 4216

Mean 6508 7556 7094 5912 6818 10422 5451 4958 4694 5091 5152 5656

Total TWAS/Primary Sludge Flow to Digesters, gallons per day (GPD)


Max ** 29656 30693 30896 25600 52800 67200 54858 34974 34776 45696 28711

Min ** 0 24742 9184 1250 32000 38400 33044 17317 12000 12000 23571

Mean ** 7246 27236 15179 23525 44097 52800 36537 30339 29380 31420 25446

** DAFT off line for repair and Pri-Sludge meter not tied in yet.

Volume Sludge Processed on Belt Press, GPD


Max 33686 45754 34351 40067 36439 52259 60353 54696 48861 42867 50177 50322

Mean 25111 32672 28285 30148 28569 39609 43400 38770 33667 33395 34565 28784

Total 778431 914821 876846 904439 885640 1188256 1345395 1201877 1010010 1035245 1036944 898656

DAFT/Digesters

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Pri-Sl TS %

3.56 3.15 0 4.3 4.33 2.37 2.08 2.88 3.07 2.62 2.59 4.0

Pri-Sl VS %

80.56 86.65 0 82.67 81.22 74.38 83.5 82.3 74.9 83.25 81.76 87.18

TWAS TS %

0 3.75 3.04 4.46 3.31 0 0 2.83 2.89 3.1 3.72 3.93

TWAS VS %

0 78.1 81.8 76.9 83.7 0 0 82.3 74.9 79.3 76.2 81.4

DIG 3 TS %

1.6 1.8 1.8 2.3 2.0 1.8 1.4 1.7 1.9 1.9 2.0 2.2

DIG 3 VS %

65.4 78.1 71.5 70.1 70.2 69.6 73.8 69.3 70.9 73.5 71.5 66.5

DIG 3 ALK mg/L

2652 2068 2539 2606 2568 2229 1920 1816 2220 2300 2277 2585

DIG 1 TS %

1.55 1.53 1.77 1.96 1.97 1.61 1.39 1.36 1.69 1.51 1.74 1.88

DIG 1 Vs %

67.0 66.8 74.2 73.3 63.8 66.6 60 73.1 62.6 76.7 78.6 73.4

DIG 1 ALK mg/L

2856 2855 2947 2903 3043 2504 2331 2045 2462 2622 2626 2750

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Solids Handling The anaerobic digestion process reduces sludge volume and stabilizes the solids to form bio-solids. During sludge digestion methane gas is produced and is feed to one of two biogas generators which are owned and operated by the City of Paso Robles. The biogas generators use the methane gas produced during sludge digestion as fuel source to produce electricity through a process called cogeneration. In 2017, an average of 33,087 GPD of TWAS and primary sludge were pumped to the anaerobic digesters for treatment. The average thickened waste activated sludge (TWAS) total solids concentration was 3.31 % and total volatile solids content was 79.8 % of total solids. The average primary sludge totals solids concentration was 3.18% and the volatile solids content was 82.1%. The average hydraulic retention time of sludge in the series of three, 366,000 gallon digesters was 33.2 days. In 2017 approximately 2670.4 dry tons of bio-solids were produced and used for cover material at the City of Paso Robles Landfill. Results of tests performed in 2017 are presented in Table 6.

Table 6: Bio-solids Quality Monitoring 2017

Dewatered Sludge, mg/kg 1st Q 2Nd Q 3rd Q 4th Q

Arsenic 3.53 0.06 4.4 2.61

Boron 37.6 47.9 42.7 33.3

Cadmium 2.75 ND 4.21 1.32

Chromium 16.8 0.24 18.35 10.49

Copper 433 0.08 474.5 459

Lead 23.4 0.13 18.51 6.4

Mercury 0.2570 0.296 0.485 0.1284

Molybdenum 9.44 0.23 14.3 18.1

Nickel 15.9 0.22 19.25 10.58

Phosphorus 16400 29500 17050 16960

Selenium 27.8 0.09 20.15 27.17

Zinc 541 13.2 570 530.33

Ammonia Nitrogen 4060 2950 5830 6826

% Moisture 79.2 40.7 49.7 46.1

Nitrate Nitrogen 2.4 1.35 487 5.84

Nitrogen, Total as Nitrogen 28000 27100 23150 23200

Nitrate + Nitrite as N ND ND 487 5.84

TKN 28400 27100 22900 23200

pH 6.98 6.75 6.23 7.59

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4. Plant Maintenance Summary

Plant Maintenance Summary Table 7: Plant Maintenance Frequency

Weekly Monthly Standby Generator test run + Bar Screens rotated, cleaned & greased + Fire Extinguishers check + Eye wash stations(7) tested + All clarifier drives (5) greased and lubed + Daft drive greased and lubed + Duty / standby pumps rotated + Co-gen oil sampled, daily recorded run logs 250 hours Standby Generator oil tested quarterly Belt press greased and oil added to auger if needed + Primary Moyno pump by-pass cleaned + Primary Scum pump basin washed out + Primary clarifiers (2) , Final clarifiers (3) sprayed down (3) (2) PEP pumps and RAS pumps, standby rotated, bumped + Control Panel maintenance (cleaning, bulb replacement) quarterly Electrical vaults, water pumped out Wet season

Additional Monthly Maintenance & Repairs Other Than PM’s on Plant Equipment:

JANUARY 2017

• Sent Standby Generator oil Sample Out for Lab Analysis. 1/11/17 • Replaced SBS Tube. 1/13/17 • Change SBS Tube. 1/18/17 • Change Belt on Digester Mixing Pump #3. 1/24/17 • Replace Flow Switch for Seal Water on Digester #3 Mixing Pump 1/31/13

FEBRUARY 2017

• Kaeser here to Fix Air Compressor 6251B 2/3/17 • Sent Co-Gen Engine G3418 Oil Sample Out for Analysis. 2/9/17 • Added Coolant to Co-Gen Engine G3418 & Back-up Generator G3419. Testing for Siloxanes. 2/13/17 • Kaeser here to fix Air Compressor. 6215A 2/15/17 • Change Oil in #2 Primary Drive and Filtrate Mixer. 2/23/17 • Sent Back-up Generator G3419 Oil Sample Out for Analysis. 2/21/17

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MARCH 2017

• Change SBS and ammonium pump tubing. 3/3/17 • Replaced tubing on sodium Hypo pump 7310. 3/5/17 • Broken W-3 water line. 3/6/17 • Kaeser compressor 6251A fail. 3/13/17 • Install new pH probe w/guard at septage. 3/14/17 • Working on septage receiving level transducer. 3/16/17 • Inspecting splash plate on saturation tank. 3/20/17 • Service secondary clarifier #1. 3/23/17

APRIL 2017

• Re-Boot aeration blower PLC. 4/4/17 • Replace secondary clarifier sample pump. 4/14/17 • Replace sample pump for cl2 analyzer out. 4/16/17 • Replace level sensor for septage receiving. 4/19/17

May 2017

• Southern Electric replacing wire at headwork’s. 5/1/17 • Change salt bridge and calibrate pH probes. 5/16/17 • On 5/4 pulled w-3 pump 9330 and sent in for service and now back on-line. 5/17/17 • Kaeser here to work on both air compressors. 5/22/17 • BNR #1 out of service, pumping down. 5/23/17

June 2017

• Dosing RAS with Bleach for filament and foam control. 6/7/17 • Western Energy here to service Co-gen engines 3417 & 3418. 6/8/17 • 12 volt power supply for co-gen MCC 3001 fail. Lost SCADA communication. 6/12/17 • Replace DEOX sample pump. 6/25/17 • Filtrate pump #2 MCC failure. Replace cap & tuner for RAS pump #4. 6/28/17 • Service performed on gas scrubbing system compressors.

July 2017

• 2G onsite, installing a new breaker on for Co-gen 9220 cooling pump. Also installed new throttle valves on 9210, 9220 & 9230. 7/13/17

• Replace Minn Cass in filtrate pump station. 7/17/17 • Nueros on-site to replace switches on all three aeration blowers due to comm. Issues. 7/20/17 • Replaced network switch in G3419. 7/27/17 • Cogeneration engines and Backup Generator experiencing communication failures all month

August 2017

• Power failure, change one liner at Bar Screen conveyor. 8/4/17 • Power Failure. 8/15/17 • Brief power service outage for tertiary project. Hypo power. 8/17/17 • Multiple Stand-by Generator failure.8/23/17 • PG&E set up a recorder at Transformer. 8/30/17

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September 2017

• Gas company out to check the Boiler. 9/5/17 • 2-G, conducting power fail test, Back-up generator did not work. Adjustment made so Generator reads switch

86, not PG&E power. 9/14/17 • Service outage, shut down 3W at South end of plant. 9/19/17 • Exchanged either net switch from G3418 to G3419. 9/26/17

October 2017

• Sampled for siloxanes at Digester gas scrubbing system. 10/8/17 • Replaced transducer at DAFT. 10/18/17 • Replaced batteries on cogen 9220. 10/19/17 • Replaced SBS suction line. 10/23/17

November 2017

• Dosing ferric at Headwork’s. 11/1/17 • Ferric dosing back to WAS EQ. 11/2/17 • Received bad polymer tote. 11/14/17 • Turn hot water loop at Boiler. 11/27/17

December 2017

• Install new H2S meter on gas scrubbing system. 12/4/17 • Power fail, 4hrs long. Backup generator operated as designed. RESC-Q on-site to replace the media in one H2S

vessel and one Siloxane Vessel. 12/6/17 • RESC-Q back on-site to replace gaskets and fix leaks on vessels that had their media changed out. 12/8/17 • 3-water leak underground by primary pump room. Dug up and repaired. 12/11/17 • Shut down 3-water, Cushman Construction relocating PSI tank. Fell out of nitrification, no clue of the cause.

12/19/17 • Plant nitrifying again. 12/25/17

Annual Testing, Inspection & Calibration Record

• Annual Fire Alarm Test (Deep Blue) 4/6/17 • Annual Seismic Valve Inspection (AGB) 7/15/17 • Annual Water Back Flow Testing (Louis Schmitz Plumbing) 8/8/17 & 8/9/17 • Annual APCD Inspection 8/15/17 • Annual Service on “CL2 Out” and “De-Ox” Analyzers/Meters 10/11/17 • Annual Service on “CL2 Out” Analyzer/meter 10/12/17 • Annual Calibration of Influent, Effluent & W3 Flow Meters (F&M Controls) 10/12/17 • Annual Co-Gen Emission Source Testing (AEROS) 12/14/17 • Annual Calibration of Co-Gen Gas Monitor (EDENBROS) 12/27/17

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5. CHEMICALS AND UTILITIES

Table 8: Chemicals 2016 2017 Sodium Hypochlorite (Disinfection) $141,500.27 $125,959.64 Sodium bisulfite (De-chlorination) $87,591.78 $100,266.23 Ammonium sulfate (Chloramination) $27,954.32 $62,051.44 Ferric chloride (H2S and odor control) $27,081.65 $45,236.64 Polymer (Belt press de-watering) $39,942.72 $47,954.10

Total Chemical cost $324,070.74 $381,468.05

Septage Receiving Income $ 158,859.90

Table 9: Utilities

6. WWTP STAFFING

Operations Staffing In 2017, the treatment plant had 10 employees. Plant staffing for 2017 is shown in Table 7.

Table 10: Plant Staffing

Staff Training & Development In addition to weekly safety meetings, the WWTP attends several training opportunities through CWEA Conferences both local and at the State level as well as numerous JPIA training offered through the City organizations. 2017 also included numerous training sessions on new equipment and controls. WWTP operating staff attended the following trainings:

• CPR • First Aid • Bloodborne Pathogens/Fire Extinguisher/ATD • Hazard Communication • Hazwoper • Environmental Safety • Confined Space

Potable water/sewer $11,874.18 Electricity $326,940.13 Natural gas $15,328.10 Cogeneration Power Total of 5606 hours logged on co-gen engines @ avg. of 114kw

Tech Supervisor II 1

Tech Operator III 1 Tech Operator II 5 Lab Analyst 2 Maintenance Specialist III 1

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• Trench & Excavation • SCADA Controls • Lockout/Tag-out • Blower Operation • DAFT Operation • Chem Scan/Chlorine Analyzer Operation • BNR Microbiology

Operator Certification The WWTP utilizes a Technician III position as the lead operator working a Monday –Friday shift to lead both 4-10 schedules, Sunday –Wed. and Wed. thru Sat. shifts. He answers to the Plant Supervisor and directs day to day operations of the plant. This position currently holds a Grade III certificate. This demonstrates compliance with the regulations of the Office of Operator Certification. Table 8 summarizes the status of operator certification held by WWTP operators at the facility during 2017.

Table 11: Wastewater Treatment Certification

Grade V 1 Grade IV 0 Grade III 3 Grade II 3 Grade I / OIT 0

Additional certifications held by WWTP staff include Laboratory Analyst III, Laboratory Analyst I and future Maintenance Technologist I and II positions. Several Treatment Plant Operators also hold CWEA Collection System Maintenance certifications.

7. Wastewater Laboratory Analysis and Instrument Upkeep

January 2017

• Quarterly samples • Calibrated thermometers • Calibrated micropipettes

February 2017

• Method detection limit study, chlorine

March 2017 • Calibrated Autoclave timing device

April 2017 • Service on pH probe • Calibrated Autoclave timing device

May 2017

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• Replaced Ammonia probe • Quarterly samples • Analytical balance’s calibrated by Wine Country Balance, Napa CA June 2017 • Service on continuous analyzing samples, replaced gear box on final effluent sampler • Method detection limit study, chlorine • Calibrated micropipettes

July 2017 • Quarterly samples • Calibrated Autoclave timing device • Calibrated micropipettes

August 2017 • Service on continuous analyzing samplers

September 2017 • No Activities

October 2017 • Service on ammonia probe • Quarterly Samples

November 2017 • Revised quality assurance manual • Method detection limit study, chlorine

December 2017 • Replaced nitrate probe • Replaced gearbox on Influent sampler • Calibrated micropipettes • Calibrated Autoclave timing device

8. Pretreatment Formal Pretreatment Program Requirement On July 18, 2016 the City received a letter from the RWQCB requiring a formal Pretreatment Program submittal by July 12, 2017. An extension was granted by the RWQCB until November 30, 2018. The City has submitted seven out of the nine required chapters and one additional chapter on the Hauled Waste Program.

Local Limit Development

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In February 2016 the City contracted with Larry Walker and Associates to develop revised local limits. The City received the final Local Limits Report on December 8, 2017. The revised local limits are included in the revised Sewer Use Ordinance, which should be adopted by City Council in February 2018 and become effective in March 2018. The Local Limits Report will also be included in the Pretreatment Program submittal.

Revised Ordinance The Sewer Use Ordinance was updated to meet Federal pretreatment regulations including requirements for by-pass, upset, the Enforcement Response Plan and the revised local limits. City Council introduced the Ordinance for first reading on January 16, 2018. The second reading will be on February 6, 2018, so the Ordinance will likely become effective in March 2018

Fats, Oils, and Grease Program The City’s Water Quality Specialist conducts Fats, Oils, and Grease (FOG) inspections at restaurants and commercial kitchens located within the City limits. Inspections are done to ensure that grease removal devices are being maintained correctly and the fry oil is properly disposed of. He also coordinates with the Building Department to ensure that grease interceptors are properly sized and installed in new facilities and remodels. The City conducted 149 FOG inspections during 2017. Industrial Dischargers

Sunbank: Sunbank discharges to the City under a two part Categorical Industrial Permit which was revised and issued on June 13, 2013. The Part 1 of the permit is a Zero Discharge Permit for the wastewater from the tumbling operation which is hauled off site. Part 2 of the permit is for treated wastewater from the plating lines. Sunbank now recycles a majority of their treated wastewater and now only discharges 5,000 - 6,000 gallons two days a week. They did not have any violations in their quarterly or semi-annual monitoring.

Lubrizol Advanced Materials, Inc. The City issued a two part permit to Lubrizol. The Part 1 is a Zero Discharge Permit for the categorical regulated Neutar Line. Part 2 is for the wastewater from the non-categorical processes. Lubrizol now recycles their treated wastewater by using it as make-up water in the cooling tower as needed. When the treated wastewater is recycled the only waste discharged to the City sewer is the non-contact evaporator condensate. Although the condensate is non-contact it is in violation of the current ammonia limit. Lubrizol investigated the source of the violation but was unable to determine the cause.

Firestone Walker Brewing Company Firestone Walker Brewing Company continues to expand the brewery. In 2014 they began treating wastewater with aerated ponds. Firestone’s planned beer production over the next 5 years will exceed the treatment capacity of the pond system. Therefore, an additional anaerobic treatment system is being installed to treat the brewery wastewater. Wastewater will be slipstreamed to the treatment ponds in order to keep the biology alive so the ponds be used as a back-up in case the anaerobic system goes down. The brewery continues to have issues meeting TDS, sodium, and sulfate. To lower the salts, the brewery has contracted with the City to purchase raw Nacimiento water to use in the cooling towers. This water source is surface water and is not as hard as the groundwater. Engineering reports state that use of this water for cooling will lower the salts levels enough to come into compliance with the discharge limits.

Paso Robles Wine Services

PRWS has a permit to discharge treated wastewater to the land under the WDR for Discharges of Winery Waste and is in the process of completing the land application system. This will reduce the amount of wastewater discharged to

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the City and help with compliance with the TDS limit during the crush season. The company has implemented numerous Best Management Practices to reduce TDS violations.

Pass-through and Interference There were no incidents of pass-through, or treatment interference caused by industrial discharges in 2017.

9. Certification of Report I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on the information submitted is to the best of my knowledge and belief, true, accurate, and complete.

If you have any questions or need additional information, please feel free to contact me at [email protected] or (805) 237-3865.

Sincerely,

Andy Mark, WWTPO V-10478 Technical Supervisor II / Chief Plant Operator City of Paso Robles WWTP Paso Robles, Ca.

mailto:[email protected]

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Appendix A

Performance Charts

City of Paso Robles

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2017 Toxicity Compliance Summary

Sample Point 001C 001C 001C 001C Sample Date 1/17/2017 5/2/2017 7/10/2017 10/17/2017 Test Species

Acute 96 Hour Fathead Minnow

Survival % 100% 97% 98% 100% Growth TUa 0 0.28 0.18 0

Chronic Fathead Larvae

NOEC 100.00% 100.00% 100.00% 100.00% TUc 1 1 1 1

Survival IC25 N/A N/A N/A N/A

IC50 N/A N/A N/A N/A

Chronic Fathead Larvae

NOEC 100.00% 100.00% 100.00% 100.00% TUc 1 1 1 1

Growth IC25 N/A N/A N/A N/A


Acute 96 Ceriodaphnia

Survival % Growth TUa

Chronic Ceriodaphnia

NOEC 100.00% 100.00% 100.00% 100.00% TUc 1 1 1 1

Survival IC25 N/A N/A N/A N/A


Chronic Ceriodaphnia

NOEC 100.00% 100.00% 100.00% 100.00% TUc 1 1 1 1

Reproduction IC25 N/A N/A N/A N/A


Chronic Selenastrum Algae

NOEC 100.00% 100.00% 100 100.00% TUc 1 1 1 1



2017 wastewater treatment plant annual report

Documents