Appendix Table 3b. Summary for Oregon 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 GC material was 
not analyzed or OC activity not done. Those values in red are averages failing 
DOO, borderline average values, or a significantly reduced number of analytes 
were reported. 
Oregon 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) 
Metals 
Sediment 
no* no** 
NIST 1944 
40% 42% 
(19) 
yes 
(22) 
yes 
Tissue 
NA 
NA 
NA 
NA 
Sediment (15) 
yes 
MESS-2 
(11) 
yes 
(15) 
yes 
Tissue (13) 
yes 
NIST 2976 
(10) 
none 
yes 
PCBs (21) 
Sediment 
no* no** 
NIST 1944 
115% 16% 
(19) 
yes 
(18) 
yes* 
*1944 = 37% 
Tissue 
no* no** 
CARP-2 
58% 18% 
(17) 
yes 
yes 
Pesticides (20) 
Sediment 
no* no** 
NIST 1944 
90% 47% 
1944 & MS/MSD 
(8,H) 
yes 
(19) 
yes 
Tissue 
no* no** 
CARP-2 
36% 40% 
CARP & MS/MSD 
(6, 12) 
yes 
yes 
127 
