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Ref. No. [UMCES] CBL 2015-008
ACT VS15-01
50
Table 7.
Results of Field Duplicates (FD) and Field Trip Blank (FTB) for the Great Lakes, MI mooring
test. The field trip blank was determined with a mixture of commercial NBS buffers.
Date/Time
Rep
Temp
Salinity
pH
Std Dev Mean Std Dev
ABS
Diff
6-23-14 11:15
FD1
19.7
0.029
8.013
.003
8.016
.004
.005
FD2
8.018
.003
6-27-14 14:30
FD1
21.0
0.030
8.324
.004
8.322
.002
.003
FD2
8.321
.008
7-8-14 10:15
FD1
21.1
0.031
8.136
.001
8.131
.008
.011
FD2
8.125
.004
7-10-14 12:00
FD1
21.0
0.031
8.387
.010
8.400
.018
.025
FD2
8.412
.006
7-17-14 15:15
FD1
20.4
0.032
8.304
.008
8.300
.006
.009
FD2
8.295
.007
7-19-14 10:15
FD1
20.4
0.032
8.275
.002
8.273
.003
.004
FD2
8.271
.008
7-14-14 9:15
FTB1
22.0
0.032
8.258
.005
8.257
.002
.003
FTB2
8.255
.003
External Quality Assurance and Quality Control Assessments
An effective assessment program is an integral part of ACT’s quality system for
performance evaluations of marine sensor technologies. The ACT Quality Assurance (QA)
Manager independently conducted three technical systems audits (TSA), an audit of data quality
(ADQ), and a Data Quality Assessment (DQA) for the pH verification. The audits were
conducted in accordance with the procedures described in EPA's
Guidance on Technical Audits
and Related Assessments for Environmental Data Operations (EPA QA/G-7)
.
Technical System Audit -
A Technical Systems Audit (TSA) is a thorough, systematic, on-site
qualitative audit of ACT’s sampling and measurement processes and procedures associated with
a specific technology verification. The objective of a TSA is to assess and document the
conformance of on-site testing procedures with the requirements of the Test Protocols, and
associated SOPs. The ACT QA Manager conducted the following three TSAs over the course of
the verification:
•
The laboratory tests at the Hawai‘i Institute of Marine Biology (HIMB), Coconut
Island, Kaneohe Bay, Oahu, HI during December 11-15, 2012.
•
The field tests at HIMB during November 19-21, 2013.
•
The field tests at the Chesapeake Biological Laboratory, Solomons, MD during
March 11-14, 2014