Appendix Table 3a. Summary for Washington data of performance with regard to QC 
criteria for analysis of reference materials, matrix spike recoveries, and relative 
percent difference or coefficient of variation (RPD, CV) of replicates. SRM = 
Standard Reference Material, CRM = Certified Reference Material, LCM = 
Laboratory Control Material, NA = not applicable, none = this QC material was 
not analyzed or QC activity not done. Those values in red are averages failing 
DQO, borderline average values, or a significantly reduced number of analytes 
were reported. 
Washington 2003 
Analytes (#) Matrix 
Reference Materials 
average recovery within: 
±30% organics and 
±20% metals 
of true value*; 70% of 
individuals within ±35% 
of true value** 
Matrix 
spikes 
RPDs and 
CVs 
of Matrix 
spikes and 
Reference 
Materials 
DQO met? 
If no, 
average % 
different 
from true 
value 
(# analytes 
reported) 
recovery 
DQO of 
50%- 
120% 
met? 
met DQO of 
average 
<30%? 
PAHs (22) 
Sediment 
no* no** 
NIST 1941 
44%* 59%** 
(22) 
yes 
(22) 
yes 
Tissue 
NA 
NA 
NA 
NA 
Metals 
(tissues by 
GPL lab) 
Sediment (15) 
yes* yes** 
NIST 2711 
29.8%* 80%** 
(15) 
yes 
(15) 
yes 
Tissue (13) 
yes 
soiked cod 
(7) 
yes 
03) 
yes 
PCBs (21) 
(tissues by 
GPL lab) 
Sediment 
no* yes** 
NIST 1941b 
35%* 83%** 
(18) 
yes 
(21) 
yes 
Tissue 
no* no** 
LCM 
61%* 48%** 
cod & MS/MSD 
(10 & 11) 
yes 
(21) 
yes 
Pesticides (20) 
(tissues by 
GPL lab) 
Sediment 
no* no** 
NIST 1941 
43%* 58%** 
1941 & MS/MSD 
(5 & 14) 
yes 
(18) 
yes 
Tissue 
no* no** 
LCM 
57%* 30%** 
cod & MS/MSD 
(12 & 8) 
yes 
(19) 
yes 
126 
