Document b5J0rYwjyxjNVzpo0beZynZV6
Report Prepared by: Report Approved by:
NPDES Compliance Sampling Inspection Report
Albert M. Nelthropp (Anguilla) Wastewater Treatment Facility
St. Croix, United States Virgin Islands
VI0020036
November 4-5, 2021
ROBERT
Digitally signed by ROBERT
MORRELL
_M_O_R__R_E_L_L_________Da_te_: 2_0_21_.12_.0_3_18_:0_8:_10_-0_5_'00_'
Robert Morrell, Geologist
Monitoring Operations Section
Date: ________________
Digitally signed by PHILIP
PHILIP COCUZZA COCUZZA ________________D_a_te_: 2_02_1._12_.03_0_4:_08_:22_-_05_'00_' _ Philip Cocuzza, Chief Monitoring Operations Section
Date: ________________
Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
1.0 OBJECTIVE
On November 4-5, 2021, at the request of the Caribbean Environmental Protection Division, a National Pollutant Discharge Elimination System (NPDES) Compliance Sampling Inspection (CSI) was conducted at the Albert M. Nelthropp (Anguilla) Wastewater Treatment Facility in St. Croix, United States Virgin Islands. The objective of the CSI was to gather information necessary to determine compliance with the requirements and limitations of TPDES Permit No. VI0020036.
2.0 KEY PARTICIPANTS
Listed below are key inspection participants and contact information, grouped by organization.
U.S. Environmental Protection Agency Robert Morrell, Geologist, Lead Inspector Morrell.robert@epa.gov, 732-906-6804 Thuan Tran, Physical Scientist Tran.thuan@epa.gov, 732-321-4455
Albert M. Nelthropp (Anguilla) Wastewater Treatment Facility Victor Cosart, Plant Manager/Operator, VWNA Caribbean Victor.cosart@veolia.com, 813-499-8814
U.S. Virgin Islands Department of Planning and Natural Resources Courtney Dickenson, Environmental Program Manager Courtney.dickenson@dpnr.vi.gov, 340-514-3666
3.0 FACILITY DESCRIPTION
3.1 General Information
The Anguilla Wastewater Treatment Facility is located on East Airport Road at Estate Bethlehem Middle Works in St. Croix, U.S. Virgin Islands. The wastewater treatment plant was originally built as a primary treatment plant but was upgraded to a sequential batch reactor (SBR) plant around 2007. The facility is categorized as Standard Industrial Classification (SIC) Code 4952. The plant operates 24 hours per day, 7 days per week.
3.2 Process Information
The Anguilla Wastewater Treatment Facility is a sequential batch reactor (SBR) plant consisting of three SBR's. Average flow for the plant is 1.5 million gallons per day (mgd) with a design capacity of 4 mgd. Most of the influent wastewater is domestic. Influent
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Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
wastewater flows through a mechanical bar screen and into a grit chamber. Solids from the bar screen and grit chamber are collected in a container and transported to the Anguilla Landfill for disposal. Influent flow is monitored continuously with a Venturi meter. The influent wastewater flows into one of two primary clarifiers. During the sampling inspection, only one clarifier was in service. Wastewater from the clarifiers flows to the primary effluent pumping station, where it is pumped to one of three SBR's. Treatment in each SBR consists of four stages: the fill stage, aeration stage, settlement stage, and decant stage. During the walk-through inspection, SBR 1 was in the settlement stage, SBR 2 was in the aeration stage, and SBR 3 was in the decant stage. Each SBR requires approximately 35 minutes for filling, 15 minutes for aeration, and 90 minutes for settling. After settling, the decant stage is started. Decant wastewater is discharged to the equalization tank. The wastewater then flows through a series of disc filters, which are currently out of service. The wastewater is conveyed to one of two ultraviolet (UV) channels for disinfection. Most of the UV lamps were out of service during the sampling inspection. The wastewater flows over a rectangular weir, where a primary flow monitoring device records the flow continuously. Finally, the wastewater is discharged through Outfall 001 to Krause Lagoon.
Waste activated sludge from the SBR's is pumped to one of two secondary aerobic digesters. The primary aerobic digester is out of service. After digestion, the sludge is pumped to the sludge drying beds. After drying, the sludge is placed in a container and transported to the Anguilla Landfill for disposal.
3.3 Facility Self-Monitoring Information
Samples are collected and analyzed on-site for temperature, pH, and dissolved oxygen. Phosphorus, turbidity, oil and grease, total suspended solids (TSS), and 5-day biochemical oxygen (BOD5) are analyzed by Benchmark Analytics in Florida. Fecal coliform and enterococci are analyzed at the Red Point Wastewater Treatment Facility laboratory in St. Thomas. Flow is measured continuously at the influent and effluent sampling locations.
4.0 EPA SAMPLING/INSPECTION ACTIVITIES
4.1 Sampling Activities
On November 4, 2021, an automatic composite sampler was set up at the influent sampling location. The sampler was programmed to collect an aliquot of the influent wastewater every 15 minutes for 24 hours. The composite sample container was packed in ice.
An automatic composite sampler was also set up at the effluent sampling location for Outfall 001. The sampler was programmed to collect an aliquot of the effluent wastewater every 15 minutes for 24 hours. The composite sample container was packed in ice.
Using a rod and clamp, five consecutive grab samples (Grab #1, Grab #2, Grab #3, Grab #4, and Grab #5) were collected 15 minutes apart at the effluent sampling location for Outfall
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Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
001. These samples were delivered to Ocean Systems Laboratories in St. Croix for the analysis of fecal coliform and enterococci.
Grab samples were collected at the effluent sampling location for the on-site analysis of pH, temperature, dissolved oxygen, and total residual chlorine. The results were recorded in the field notebook.
On November 5, 2021, a 24-hour composite sample was collected from the automatic sampler at the influent sampling location. This sample was analyzed for BOD5 and TSS.
A 24-hour composite sample was collected from the automatic sampler at the effluent sampling location for Outfall 001. This sample was analyzed for BOD5 and TSS.
Using a rod and clamp, a grab sample (Grab #6) was collected at the effluent sampling location for Outfall 001. This sample was analyzed for phosphorus, oil and grease, and turbidity.
Flow readings were provided by the facility representative. The 24-hour effluent flow for 11/4/21 was 1.40 mgd.
All sample containers, preservation techniques, and holding times were in accordance with U.S. EPA requirements specified in 40 CFR Part 136. Samples for fecal coliforms and enterococci were placed in a cooler with wet ice and transported to Ocean Systems Laboratories in St. Croix, U.S. Virgin Islands. All other samples were placed in a cooler with wet ice and shipped overnight to the U.S. EPA Region 2 Laboratory in Edison, New Jersey. Split samples were offered but declined by the facility representative.
4.2 Inspection Activities
A walk-through inspection of the Anguilla Wastewater Treatment Facility was conducted and the inspection findings are listed in Section 6.2.
4.3 Deviations and/or Environmental Conditions
Oil from a septic hauler was recently pumped into the septic receiving manhole, causing oil to accumulate in one of the primary clarifiers. According to the operator, this has also caused the turbidity to be higher than normal in the equalization tank.
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Anguilla Wastewater Treatment Facility VI0020036
5.0 ANALYTICAL RESULTS
Inspection Date: November 4-5, 2021
Anguilla Wastewater Treatment Facility November 4-5, 2021 Outfall 001
Parameter Flow (mgd) BOD5 (mg/l) BOD5 (percent removal) TSS (mg/l) TSS (percent removal) Phosphorus (mg/l) Fecal Coliforms (CFU/100 ml) Fecal Coliforms (CFU/100 ml) Fecal Coliforms (CFU/100 ml) Fecal Coliforms (CFU/100 ml) Fecal Coliforms (CFU/100 ml) Fecal Coliforms (CFU/100 ml) (Geometric Mean - 5 samples) Enterococci (CFU/100 ml) Enterococci (CFU/100 ml) Enterococci (CFU/100 ml) Enterococci (CFU/100 ml) Enterococci (CFU/100 ml) Enterococci (CFU/100 ml) (Geometric Mean - 5 samples) Dissolved Oxygen (mg/l) Temperature (oC) pH (su) Oil and Grease (mg/l) Total Residual Chlorine (mg/l) Turbidity (NTU)
Influent -71.4 J* -43.0 ---------
-------
-------
Effluent 1.40 20.6 J* 71.1 J* 20.0 53.5 3.84 >6000 >6000 >6000 >6000 >6000 >6000
>6000 >6000 >6000 >6000 >6000 >6000
5.5 31.5 7.70 Not detected 0.04 14.6 J*
Permit Limit 8.0 30 85 (minimum) 30 85 (minimum) Monitor only 1000 1000 1000 1000 1000 1000
Monitor only Monitor only Monitor only Monitor only Monitor only Monitor only
Monitor only Monitor only 6.0 - 9.0 Monitor only -Monitor only
J = Estimated value *Due to a delay in shipping, the holding time was exceeded.
6.0 FINDINGS
6.1 Sampling Result Findings
The EPA analytical results obtained during this inspection show the following parameter(s) as being outside of the acceptable limits:
Fecal Coliforms (see above table). TSS Percent Removal (see above table).
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Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
6.2 Inspection Findings
In addition to the sampling, an inspection of the facility operations was conducted as discussed in Section 4.2 above. During this inspection the following observations were noted which may contravene the requirements of the permit or the applicable regulations:
1. A septic hauler recently pumped oil into the septic receiving manhole causing a disruption of the operation of the treatment plant. In the future, it is recommended that all septic haulers have their loads properly screened and inspected before unloading.
2. The disc filters are currently out of service. It is recommended that the filtration system be serviced and operational, as this will improve turbidity levels prior to UV disinfection.
3. The UV disinfection system is not fully operational and needs to be serviced. Most of the UV lamps need to be replaced.
4. The flow meters at the influent and effluent locations haven't been calibrated in the last few years. Flow meters should be calibrated at least once per year.
7.0 ATTACHMENTS
Photographs (#1 - #8) EPA Laboratory Data Report Ocean Systems Laboratories Data Report Chain of Custody / Field Data Forms
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Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
Photo #1: View of the effluent sampling location for Outfall 001.
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Anguilla Wastewater Treatment Facility VI0020036
Photo #2: View of the influent sampling location.
Inspection Date: November 4-5, 2021
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Anguilla Wastewater Treatment Facility VI0020036
Photo #3: View of SBR 1.
Inspection Date: November 4-5, 2021
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Anguilla Wastewater Treatment Facility VI0020036
Photo #4: View of SBR 2.
Inspection Date: November 4-5, 2021
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Anguilla Wastewater Treatment Facility VI0020036
Photo #5: View of SBR 3.
Inspection Date: November 4-5, 2021
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Anguilla Wastewater Treatment Facility VI0020036
Photo #6: View of the equalization tank.
Inspection Date: November 4-5, 2021
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Anguilla Wastewater Treatment Facility VI0020036
Inspection Date: November 4-5, 2021
Photo #7: View of the secondary aerobic digester.
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Anguilla Wastewater Treatment Facility VI0020036
Photo #8: View of the sludge drying beds.
Inspection Date: November 4-5, 2021
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
2890 Woodbridge Avenue Edison , New Jersey 08837
732-906-6886 Phone 732-906-6165 Fax
November 17, 2021
Bob Morrell Monitoring & Assessment Branch LSASD/MAB Edison, NJ 08837
RE: Anguilla -Albert Nelthropp- WWTP - 2111017
Enclosed are the results of analyses for samples received by the laboratory on 11/08/2021. The signature below reflects the laboratory's approval of the reported results. If you have any questions concerning this report, please refer to Project Number 2111017 and contact the laboratory. Sincerely,
Ness Tirol Acting Chief, LSASD/LB
Project Narrative:
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017
The National Environmental Laboratory Accreditation Conference Institute (TNI) is a voluntary environmental laboratory accreditation association of State and Federal agencies. TNI established and promoted a National Environmental Laboratory Accreditation Program (NELAP) that provides a uniform set of standards for the generation of environmental data that are of known and defensible quality. The EPA Region 2 Laboratory is NELAP accredited. The Laboratory tests that are accredited have met all the requirements established under the TNI Standards.
Condition Comments
Turbidity Analysis, Sample 2111017-03: The Laboratory received the samples past the established holding time of 48 hours due to shipping delay. The result was qualified with a "J" to indicate an estimated value.
Biochemical Oxygen Demand- Samples were received past the holding time. The results for samples 2111017-01 and 2111017-02 were qualified with a "J" as an estimated value.
Comment(s):
The "Sample Analysis Date and Time" is included in the results section for any analyte with a prescribed holding time of 72 hours or less.
Data Qualifier(s):
U- The analyte was not detected at or above the Reporting Limit. J- The identification of the analyte is acceptable; the reported value is an estimate. K- The identification of the analyte is acceptable; the reported value may be biased high. L- The identification of the analyte is acceptable; the reported value may be biased low. NJ- There is presumptive evidence that the analyte is present; the analyte is reported as a tentative identification. The reported value is an estimate.
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017
Reporting Limit(s):
The Laboratory was able to achieve the standard laboratory reporting limits, where applicable, for each analyte requested except for the following analyte(s):
GC - Sanitary The reporting level of 5.00 mg/L was raised to 6.8 mg/L for the following analyte(s): Oil & Grease for the following samples: 2111017-03
SUMMARY REPORT FOR SAMPLES
Field ID Influent-24 Hr. Comp. Effl-Outfall-24 Hr. Comp Effl-Outf001-Grab#6
Laboratory ID 2111017-01 2111017-02 2111017-03
Matrix Aqueous Aqueous Aqueous
Date Sampled 11/05/2021 10:29 11/05/2021 10:36 11/05/2021 11:20
Date Received 11/08/2021 10:08 11/08/2021 10:08 11/08/2021 10:08
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
Page 2 of 7
Analysis Biochemical Oxygen Demand Oil & Grease Phosphorus Residue, Non-Filterable Turbidity
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017
SUMMARY REPORT FOR METHODS
Method SM 5210B SOP C-21 Rev 2.7 EPA 1664A SOP C-126 Rev 1.6 EPA 365.1 SOP C-68 Rev 2.7 SM 2540D SOP C-33 Rev 3.7 EPA 180.1 SOP C-81 Rev 2.7
Certification
NELAP NELAP NELAP NELAP NELAP
Matrix
Aqueous Aqueous Aqueous Aqueous Aqueous
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
Page 3 of 7
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017
Analyte
Field ID: Influent-24 Hr. Comp. Sanitary
Biochemical Oxygen Demand Residue, Non-Filterable Field ID: Effl-Outfall-24 Hr. Comp Sanitary
Biochemical Oxygen Demand Residue, Non-Filterable Field ID: Effl-Outf001-Grab#6 GC - Sanitary Oil & Grease Sanitary Phosphorus Turbidity
Result
Qualifier
Reporting Limit
Units Batch
Sample ID: 2111017-01
Date and Time of Analysis*
71.4
J
2.00
mg/L B111066 11/13/2021 09:41
43.0
10.0
mg/L B111074
Sample ID: 2111017-02
20.6
J
2.00
mg/L B111066 11/13/2021 09:41
20.0
10.0
mg/L B111074
Sample ID: 2111017-03
---
U
6.80
mg/L B111088
3.84
0.500
mg/L B111073
14.6
J
0.100
NTU B111069 11/08/2021 12:15
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
Page 4 of 7
Analyte
Batch B111088 Blank (B111088-BLK1)
Oil & Grease
LCS (B111088-BS1) Oil & Grease
LCS Dup (B111088-BSD1) Oil & Grease
Matrix Spike (B111088-MS1) Oil & Grease
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017
GC - Sanitary - Quality Control
Result
Reporting Limit
Units
Spike
Source
%REC
Level
Result %REC Limits
RPD
RPD Limit
--- U
5.00 mg/L
34.2
5.00 mg/L
40.00
86
78-114
37.9
5.00 mg/L
40.00
95
78-114
10
20
Source: 2111017-03
39.8
5.00 mg/L
49.38
ND
81
78-114
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017 Sanitary - Quality Control
Analyte
Batch B111066 Blank (B111066-BLK1)
Biochemical Oxygen Demand
LCS (B111066-BS1) Biochemical Oxygen Demand
LCS (B111066-BS2) Biochemical Oxygen Demand
LCS (B111066-BS3) Biochemical Oxygen Demand
Duplicate (B111066-DUP1) Biochemical Oxygen Demand
Matrix Spike (B111066-MS1) Biochemical Oxygen Demand
Matrix Spike Dup (B111066-MSD1) Biochemical Oxygen Demand
Batch B111069 LCS (B111069-BS1)
Turbidity
LCS Dup (B111069-BSD1) Turbidity
Result
Reporting Limit
Units
Spike
Source
%REC
Level
Result %REC Limits
RPD
RPD Limit
--- U
2.00 mg/L
209
mg/L
198.0
106 84.6-115.4
216
mg/L
198.0
109 84.6-115.4
218
mg/L
198.0
110 84.6-115.4
Source: 2111017-02
16.3
2.00 mg/L
20.6
23.4
25
Source: 2111017-01
494
2.00 mg/L
396.0
71.4
107
75-125
Source: 2111017-01
444
2.00 mg/L
396.0
71.4
94.2
75-125
10.6
200
17.1
0.100 NTU
16.50
17.0
0.100 NTU
16.50
104
85-115
103
85-115
0.587
20
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
Page 6 of 7
Analyte
Batch B111069 Duplicate (B111069-DUP1)
Turbidity
Batch B111073 LCS (B111073-BS1)
Phosphorus
LCS Dup (B111073-BSD1) Phosphorus
Matrix Spike (B111073-MS1) Phosphorus
Batch B111074 Blank (B111074-BLK1)
Residue, Non-Filterable
LCS (B111074-BS1) Residue, Non-Filterable
LCS Dup (B111074-BSD1) Residue, Non-Filterable
Duplicate (B111074-DUP1) Residue, Non-Filterable
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Region 2 Laboratory
Final Report Project: Anguilla -Albert Nelthropp- WWTP - 2111017
Project Number: 2111017 Sanitary - Quality Control
Result
Reporting Limit
Units
Spike
Source
%REC
Level
Result %REC Limits
RPD
RPD Limit
Source: 2111017-03
14.5
0.100 NTU
14.6
0.687
20
2.30
0.250 mg/L
2.220
103
90-110
2.37
0.250 mg/L
2.220
107
90-110
3
20
Source: 2111017-03
4.45
0.500 mg/L
1.000
3.84
61
90-110
--- U
10.0 mg/L
55.0
10.0 mg/L
54.30
101
85-115
55.0
10.0 mg/L
54.30
101
85-115
0.00
20
Source: 2111017-02
19.0
10.0 mg/L
20.0
5.13
20
U.S.E.P.A Region 2 Laboratory
NOTE: The results recorded in this report relate only to the samples as received on the date and at the time noted Reported: 11/17/2021
Page 7 of 7
US EPA REGION 2 LABORATORY
CHAIN OF CUSTODYI FIELD DATA FORM
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