NCG080776_2021 DMR_20210503 (4)

ENCO Laboratories
TNI
Accurate. Timely. Responsive. Innovative.
102-A Woodwinds Industrial Court
Cary NC, 27511
Phone: [phone] FAX: [phone]
Monday, February 22, 2021
City of Durham (CI020)
Attn: John Sandin
1100 Martin Luther King Parkway
Durham, NC 27704
RE: Laboratory Results for
Project Number: Stormwater, Project Name/Desc: Stormwater
ENCO Workorder(s): CE02095
Dear John Sandin,
Enclosed is a copy of your laboratory report for test samples received by our laboratory on
Thursday, February 11, 2021.
Unless otherwise noted in an attached project narrative, all samples were received in
acceptable condition and processed in accordance with the referenced methods/procedures.
Results for these procedures apply only to the samples as submitted.
The analytical results contained in this report are in compliance with NELAC standards, except
as noted in the project narrative if applicable. This report shall not be reproduced except in
full, without the written approval of the Laboratory.
This report contains only those analyses performed by Environmental Conservation
Laboratories. Unless otherwise noted, all analyses were performed at ENCO Cary. Data from
outside organizations will be reported under separate cover.
If you have any questions or require further information, please do not hesitate to contact me.
Sincerely,
lit
Amanda L. Gaines
Project Manager
Enclosure(s)
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 1 of 9

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SAMPLE SUMMARY/LABORATORY CHRONICLE
Client ID: sample 2
Lab ID: CE02095-01
Sampled: 02/11/21 12:00
Received: 02/11/21 15:00
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
03/11/21
02/17/21 10:44
02/17/21 14:29
SM 254OD-2011
NO PREP
02/18/21
02/18/21 08:31
02/19/21 13:18
SM 4500H+B-2011
NO PREP
02/11/21 12:14
02/16/21 11:42
02/16/21 11:42
Client ID: sample 3
Lab ID: CE02095-02
Sampled: 02/11/21 13:10
Received: 02/11/21 15:00
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
03/11/21
02/17/21 10:44
02/17/21 14:29
SM 254OD-2011
NO PREP
02/18/21
02/18/21 08:31
02/19/21 13:18
SM 4500H+B-2011
NO PREP
02/11/21 13:24
02/16/21 11:42
02/16/21 11:42
Client ID: sample 4
Lab ID: CE02095-03
Sampled: 02/11/21 13:30
Received: 02/11/21 15:00
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
03/11/21
02/15/21 10:30
02/15/21 16:11
SM 254OD-2011
NO PREP
02/18/21
02/18/21 08:31
02/19/21 13:18
SM 4500H+B-2011
NO PREP
02/11/21 13:44
02/16/21 11:42
02/16/21 11:42
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 2 Of 9

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SAMPLE DETECTION SUMMARY
Client ID: sample 2
Lab ID:
CE02095-01
Analvte
Results
Flag
MDL
2
Units
Method
Notes
pH
6.7
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. C)
20
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
220
2.5
2.5
mg/L
SM 254OD-2011
Client ID: sample 3
Lab ID:
CE02095-02
Analvte
Results
Flag
MDL
2
Units
Method
Notes
pH
6.8
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. C)
20
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
81
2.5
2.5
mg/L
SM 254OD-2011
Client ID: sample 4
Lab ID:
CE02095-03
Analvte
Results
Flag
MDL
2
Units
Method
Notes
Oil & Grease (HEM)
11.5
1.50
5.00
mg/L
EPA 1664B
pH
6.5
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. C)
20
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
350
2.5
2.5
mg/L
SM 254OD-2011
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 3 Of 9

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ANALYTICAL RESULTS
Description: sample 2 Lab Sample ID:CE02095-01 Received: 02/11/21 15:00
Matrix: Water Sampled: 02/11/21 12:00 Work Order: CE02095
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analvte rCAS Numberl Results Flag Units DF MDL Q Batch Method Analyzed By Notes
pH^ 6.7 pH 1 1.0 1.0 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Temperature for pH (deg. Q 20 pH 1 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Classical Chemistry Parameters
Analvte rCAS Numberl Results Flag
Units
DF
Q
Batch
Method
Analyzed
By Notes
Total Suspended Solids 220
mg/1-
1
2.5
11318003
SM 254OD-2011
02/19/21 13:18
AMP
Classical Chemistry Parameters
^ - ENCO Jackson w1le certified analyte [NC 442]
Analvte rCAS Numberl Results Flag
Units
DF
Q
Batch
Method
Analyzed
By Notes
Oil & Grease (HEM) [C-0007]^ < 5.00
mg/1-
1
5.00
11317002
EPA 1664B
02/17/21 14:29
LTS
Description: sample 3 Lab Sample ID:CE02095-02 Received: 02/11/21 15:00
Matrix: Water Sampled: 02/11/21 13:10 Work Order: CE02095
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters I
^ - ENCO Cary certified analyte [NC 591]
Analvte rCAS Numberl Results Flag Units DF MDL Q Batch Method Analyzed By Notes
pH^ 6.8 pH 1 1.0 1.0 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Temperature for pH (deg. Q 20 pH 1 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Classical Chemistry Parameters
Analvte rCAS Numberl Results Flag
Units
DF
Q
Batch
Method
Analyzed
By Notes
Total Suspended Solids 81
mg/L
1
2.5
11318003
SM 254OD-2011
02/19/21 13:18
AMP
Classical Chemistry Parameters
^ - ENCO Jackson w1le certified analyte [NC 442]
Analvte rCAS Numberl Results Flag
Units
DF
Q
Batch
Method
Analyzed
By Notes
Oil & Grease (HEM) [C-0007]^ < 5.00
mg/1-
1
5.00
11317002
EPA 1664B
02/17/21 14:29
LTS
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 4 Of 9

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ANALYTICAL RESULTS
Description: sample 4 Lab Sample ID:CE02095-03 Received: 02/11/21 15:00
Matrix: Water Sampled:02/11/21 13:30 Work Order: CE02095
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl Results Flao Units DF MOIL Q Batch Method Analyzed By Notes
pH^ 6.5 pH 1 1.0 1.0 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Temperature for pH (deg. C) 20 pH 1 11316006 SM 4500H+B-2011 02/16/21 11:42 ZGW Q-01
Classical Chemistry Parameters
Analyte rCAS Numberl Results Flag
Units
DF
I'2
Batch
Method
Analyzed
By Notes
Total Suspended Solids 350
mg/L
1
2.5
11318003
SM 254OD-2011
02/19/21 13:18
AMP
Classical Chemistry Parameters
^ - ENCO Jackson w1le certified analyte [NC 442]
Analyte rCAS Numberl Results Flag
Units
DF
I'2
Batch
Method
Analyzed
By Notes
Oil &Grease (HEM) [C-0007]^ 11.5
mg/L
1
5.00
11315001
EPA 1664B
02/15/21 16:11
LTS
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 5 Of 9

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QUALITY CONTROL DATA
Classical Chemistry Parameters - Quality Control
Batch IB16006 - NO PREP
LCS (1B16006-BSI) Prepared & Analyzed: 02/16/2021 11:42
Spike
Source
%REC
RPD
Analvte
Result Flag
2
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
7.0
1.0
pH
7.00
99 99-101
Duplicate (1B16006-DUPI)
Prepared & Analyzed: 02/16/2021 11:42
Source: CD20600-01
Spike
Source
%REC
RPD
Analvte
Result Flag
Q
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
7.3
1.0
pH
7.2
0.8 25
Classical Chemistry Parameters - Quality Control
Batch IBI8003 - NO PREP
Blank (1B1B003-BLK3) Prepared: 02/18/2021 08:31 Analyzed: 02/19/2021 13:18
Spike Source %REC RPD
Analyte Result Flag Q Units Level Result %REC Limits RPD Limit Notes
Total Suspended Solids 2.5 U 2.5 mg/L
LCS (1B1B003-BSI) Prepared: 02/18/2021 08:31 Analyzed: 02/19/2021 13:18
Spike
Source
%REC
RPD
Analvte
Result Flag
Q
Units
Level
Result
%REC Limits RPD
Limit Notes
Total Suspended Solids
110
2.5
mg/L
100
109 80-120
Duplicate (1B1B003-DUPI)
Prepared: 02/18/2021 08:31 Analyzed: 02/19/2021 13:18
Source: AE00737-01
Spike
Source
%REC
RPD
Anala
Result Flag
Q
Units
Level
Result
%REC Limits RPD
Limit Notes
Total Suspended Solids
16
2.5
mg/L
23
36
20 QM-12, LP-02
Classical Chemistry Parameters - Quality Control
Batch IB15001 - EPA 1664E
Blank (1B15001-BLKI) Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike Source %REC RPD
Anala Result Flag Q Units Level Result %REC Limits RPD Limit Notes
Oil & Grease (HEM) 5.00 U 5.00 mg/L
LCS (1B15001-BSI) Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike Source %REC RPD
Anala Result Flag Q Units Level Result %REC Limits RPD Limit Notes
Oil & Grease (HEM) 152 5.00 mg/L 160 95 78-114
LCS Dup (1B15001-BSDI) Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike
Source
%REC
RPD
Analvte
Result Flag Q Units Level
Result
%REC Limits RPD
Limit Notes
Oil & Grease (HEM)
164 5.00 mg/L 160
102 78-114 7
18
Matrix Spike (1B15001-MSI)
Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Source: CE02095-03
Spike
Source
%REC
RPD
Analvte
Result Flag 2 Units Level
Result
%REC Limits RPD
Limit Notes
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 6 Of 9

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QUALITY CONTROL DATA
Classical Chemistry Parameters - Quality Control
Batch IB15001 - EPA 1664E - Continued
Matrix Spike (1B15001-MSI) Continued Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Source: CE02095-03
Spike Source a/oREC RPD
Analvte Result Flag 2 Units Level Result %REC Limits RPD Limit Notes
Oil & Grease (HEM) 168 5.00 mg/L 160 11.5 98 78-114
Batch 1BI5003 - EPA 1664E
Blank (1B15003-BLKI)
Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
5.00
U
5.00
mg/L
LCS (1B35003-BSI)
Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
152
5.00
mg/L
160 95 78-114
LCS Dup (1B35003-BSDI)
Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
164
5.00
mg/L
160 102 78-114 7
18
Matrix Spike (1B15003-MSI)
Prepared: 02/15/2021 10:30 Analyzed: 02/15/2021 16:11
Source: CE02095-03
Spike Source %REC
RPD
Anala
Result
Flag
P L
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
168
5.00
mg/L
160 11.5 98 78-114
Batch 1B17002 - EPA 1664E
Blank (1B37002-BLK3)
Prepared: 02/17/2021 10:44 Analyzed: 02/17/2021 14:29
Spike Source %REC
RPD
Analvte
Result
Flag
P L
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
5.00
U
5.00
mg/L
LCS (1B17002-BSI)
Prepared: 02/17/2021 10:44 Analyzed: 02/17/2021 14:29
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
183
5.00
mg/L
178 103 78-114
LCS Dup (1B17002-BSDI)
Prepared: 02/17/2021 10:44 Analyzed: 02/17/2021 14:29
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
166
5.00
mg/L
176 94 78-114 10
18
Matrix Spike (1B17002-MSI)
Prepared: 02/17/2021 10:44 Analyzed: 02/17/2021 14:29
Source: CE02095-02
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit
Notes
Oil & Grease (HEM)
148
5.00
mg/L
157 4.67 92 78-114
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 7 Of 9

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FLAGS/NOTES AND DEFINITIONS
B The analyte was detected in the associated method blank.
D The sample was analyzed at dilution.
J The reported value is between the laboratory method detection limit (MDL) and the laboratory method
reporting limit (MRL), adjusted for actual sample preparation data and moisture content, where applicable.
U The analyte was analyzed for but not detected to the level shown, adjusted for actual sample preparation
data and moisture content, where applicable.
E The concentration indicated for this analyte is an estimated value above the calibration range of the
instrument. This value is considered an estimate.
MRL Method Reporting Limit. The MRL is roughly equivalent to the practical quantitation limit (PQL) and is
based on the low point of the calibration curve, when applicable, sample preparation factor, dilution
factor, and, in the case of soil samples, moisture content.
PQL PQL: Practical Quantitation Limit. The PQL presented is the laboratory MRL.
N The analysis indicates the presence of an analyte for which there is presumptive evidence (85% or greater
confidence) to make a "tentative identification".
P Greater than 25% concentration difference was observed between the primary and secondary GC column.
The lower concentration is reported.
[CALC] Calculated analyte - MDL/MRL reported to the highest reporting limit of the component analyses.
LP-02 Filtered residue did not meet 2.5 - 200mg range.
Q-01 Analysis performed outside of method - specified holding time.
QM-12 Precision between duplicate samples was outside acceptance limits.
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 8 of 9

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