NCG080776_2021 DMR_20211008 (2)

ENCO Laboratories
TNI
Accurate. Timely. Responsive. Innovative.
102-A Woodwinds Industrial Court
Cary NC, 27511
Phone: [phone] FAX: [phone]
Monday, October 4, 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): CE09994
Dear John Sandin,
Enclosed is a copy of your laboratory report for test samples received by our laboratory on
Wednesday, September 22, 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 8

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SAMPLE SUMMARY/LABORATORY CHRONICLE
Client ID: sample 2
Lab ID: CE09994-01
Sampled: 09/21/21 14:26
Received: 09/22/21 15:30
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
10/19/21
09/29/21 10:00
09/30/21 08:18
SM 254OD-2011
NO PREP
09/28/21
09/27/21 16:07
09/27/21 16:07
SM 4500H +B-2011
Same
09/21/21 14:40
09/30/21 09:29
09/30/21 09:29
Client ID: sample 3
Lab ID: CE09994-02
Sampled: 09/21/21 14:20
Received: 09/22/21 15:30
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
10/19/21
09/29/21 10:00
09/30/21 08:18
SM 254OD-2011
NO PREP
09/28/21
09/27/21 16:07
09/27/21 16:07
SM 4500H+B-2011
Same
09/21/21 14:34
09/30/21 09:29
09/30/21 09:29
Client ID: sample 4
Lab ID: CE09994-03
Sampled: 09/21/21 14:35
Received: 09/22/21 15:30
Parameter
Preparation
Hold Date/Time(s)
Prep Date/Time(s)
Analysis Date/Time(s)
EPA 1664B
EPA 1664B
10/19/21
09/29/21 10:00
09/30/21 08:18
SM 254OD-2011
NO PREP
09/28/21
09/27/21 16:07
09/27/21 16:07
SM 4500H +B-2011
Same
09/21/21 14:49
09/30/21 09:29
09/30/21 09:29
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 2 Of 8

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SAMPLE DETECTION SUMMARY
Client ID: sample 2
Lab ID:
CE09994-01
Analvte
Results
Flag
MDL
2
Units
Method
Notes
pH
7.3
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. Q
10
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
760
42
42
mg/L
SM 2540D-2011
Client ID: sample 3
Lab ID:
CE09994-02
Analvte
Results
Flag
MDL
2
Units
Method
Notes
pH
7.0
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. Q
8.9
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
490
62
62
mg/L
SM 2540D-2011
Client ID: sample 4
Lab ID:
CE09994-03
Analvte
Results
Flag
MDL
2
Units
Method
Notes
pH
6.9
1.0
1.0
pH
SM 4500H+B-2011
Q-01
Temperature for pH (deg. Q
10
pH
SM 4500H+B-2011
Q-01
Total Suspended Solids
440
62
62
mg/L
SM 2540D-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 8

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ANALYTICAL RESULTS
Description: sample 2 Lab Sample ID: CE09994-01 Received: 09/22/21 15:30
Matrix: Water Sampled:09/21/21 14:26 Work Order: CE09994
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
pH^
7.3
pH
1
1.0 1.0
1I30015
SM 4500H+B-2011
09/30/21 09:29
DMJ
Q-01
Temperature for pH (deg. Q
30
pH
1
1I30015
SM 4500H+B-2011
09/30/21 09:29
DM]
Q-01
Total Suspended Solids^
760
mg/1-
16.7
42
1I23003
SM 254OD-2011
09/27/21 16:07
DM]
Classical Chemistry Parameters
^ - ENCO Jacksonw1le certified analyte [NC 442]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
Oil & Grease (HEM) [C-0007]^
< 5.00
mg/1-
1
5.00
1I28006
EPA 1664B
09/30/21 08:18
LTS
Description: sample 3 Lab Sample ID: CE09994-02 Received: 09/22/21 15:30
Matrix: Water Sampled:09/21/21 14:20 Work Order: CE09994
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
pH^
7.0
pH
1
1.0 1.0
1I30015
SM 4500H+B-2011
09/30/21 09:29
DMJ
Q-01
Temperature for pH (deg. Q
8.9
pH
1
1I30015
SM 4500H+B-2011
09/30/21 09:29
DM]
Q-01
Total Suspended Solids^
490
mg/1-
25
62
1I23003
SM 254OD-2011
09/27/21 16:07
DM]
Classical Chemistry Parameters
^ - ENCO Jacksonw1le certified analyte [NC 442]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
Oil & Grease (HEM) [C-0007]^
< 5.00
mg/1-
1
5.00
1I28006
EPA 1664B
09/30/21 08:18
LTS
Description: sample 4 Lab Sample ID: CE09994-03 Received: 09/22/21 15:30
Matrix: Water Sampled:09/21/21 14:35 Work Order: CE09994
Project: Stormwater Sampled By:3ohn Sandin
Classical Chemistry Parameters
I
^ - ENCO Cary certified analyte [NC 591]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
pH^
6.9
pH
1
1.0 1.0
1I30015
SM 4500H+B-2011
09/30/21 09:29
DMJ
Q-01
Temperature for pH (deg. Q
30
pH
1
1I30015
SM 4500H+B-2011
09/30/21 09:29
DM]
Q-01
Total Suspended Solids^
440
mg/1-
25
62
1I23003
SM 254OD-2011
09/27/21 16:07
DM]
Classical Chemistry Parameters
^ - ENCO Jacksonw1le certified analyte [NC 442]
Analyte rCAS Numberl
Results Flag
Units
DF
MDL I'2
Batch
Method
Analyzed
By
Notes
Oil & Grease (HEM)[C-0007]^
< 5.00
mg/1-
1
5.00
1I28006
EPA 1664B
09/30/21 08:18
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 S

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QUALITY CONTROL DATA
Classical Chemistry Parameters - Quality Control
Batch 1123003 - NO PREP
Blank (1I23003-BLKI) Prepared & Analyzed: 09/27/2021 16:07
Spike Source %REC RPD
Anala Result Flag Q Units Level Result %REC Limits RPD Limit Notes
Total Suspended Solids 2.5 U 2.5 mg/L
LCS (1I23003-BSI) Prepared & Analyzed: 09/27/2021 16:07
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits
RPD
Limit Notes
Total Suspended Solids
89
2.5
mg/L
100 89 80-120
Duplicate (1I23003-DUP3)
Prepared & Analyzed: 09/27/2021 16:07
Source: CE09994-01
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits
RPD
Limit Notes
Total Suspended Solids
750
42
mg/L
760
1
20
Duplicate (1I23003-DUP2)
Prepared & Analyzed: 09/27/2021 16:07
Source: CE09994-02
Spike Source %REC
RPD
Analvte
Result
Flag
2
Units
Level Result %REC Limits
RPD
Limit Notes
Total Suspended Solids
480
62
mg/L
490
3
20
Batch 1130015 - Same
LCS (1I30015-BSI) Prepared & Analyzed: 09/30/2021 09:29
Spike
Source
%REC
RPD
Analvte
Result Flag
Q
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
7.0
1.0
pH
7.00
100 99-101
Duplicate (1I30015-DUP1)
Prepared & Analyzed: 09/30/2021 09:29
Source: CE09804-01
Spike
Source
%REC
RPD
Analvte
Result Flag
Q
Units
Level
Result
%REC Limits
RPD Limit Notes
pH
6.8
1.0
pH
6.9
2 25
Classical Chemistry Parameters -
Quality Control
Batch 1128006 - EPA 1664E
Blank (1I28006-BLKI)
Prepared: 09/29/2021 10:00 Analyzed: 09/30/2021 08:18
Spike Source %REC
RPD
Analvte
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
5.00
U
5.00
mg/L
LCS (1I28006-BSI)
Prepared: 09/29/2021 10:00 Analyzed: 09/30/2021 08:18
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
158
5.00
mg/L
161 98 78-114
LCS Dup (1I28006-BSDI)
Prepared: 09/29/2021 10:00 Analyzed: 09/30/2021 08:18
Spike Source %REC
RPD
Anala
Result
Flag
Q
Units
Level Result %REC Limits RPD
Limit Notes
Oil & Grease (HEM)
152
5.00
mg/L
161 94 78-114 4
18
FINAL
This report relates only to the sample as
received by the
laboratory, and may only be reproduced in full.
Page 5 Of 8

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QUALITY CONTROL DATA
Classical Chemistry Parameters - Quality Control
Batch 1128006 - EPA 1664E - Continued
Matrix Spike (1I28006-MSI) Prepared: 09/29/2021 10:00 Analyzed: 09/30/2021 08:18
Source: BE02268-02
Spike Source %REC RPD
Analvte Result Flag 2 Units Level Result %REC Limits RPD Limit Notes
Oil & Grease (HEM) 152 5.00 mg/L 153 5.00 u 100 78-114
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 6 Of S

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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.
Q-01 Analysis performed outside of method - specified holding time.
FINAL This report relates only to the sample as received by the laboratory, and may only be reproduced in full. I Page 7 of 8

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