Appendix Table 1.1. Summary of quality assurance results for sediment metals. RPD = relative percent difference of 
duplicate samples. CV = coefficient of variation. 
RPDs and CVs 
of matrix spikes 
and reference 
materials <30%? 
Yes 
Yes 
Yes 
Recovery of 
matrix spikes 
within 50%- 
120%? 
Yes 
Yes 
Yes 
70% of 
analytes 
within ±35% 
of true 
value? 
Yes 
Yes 
Yes 
% of 
analytes 
within ±35% 
of true value 
100% 
93% 
100% 
Average % 
deviation from 
reference 
material within 
±20% of true 
value 
Yes 
Yes 
Yes 
Average % 
deviation from 
true value of 
reference 
material 
(# Analytes) 
7% (15) 
15% (15) 
4% (13) 
State 
California 
Oregon 
Washington 
0 
O 
c 
0 
L_ 
0 
it 
~o 
c 
0 
o 
L. 
0 
CL 
0 
> 
JO 
0 
l_ 
II 
D 
CL 
X 
< 
Q_ 
c 
0 
E 
'~a 
0 
c t ,> 
i_ 
o 
<-»— 
0 
3 
CO 
0 
k_ 
0 
o 
c . 
03 C 
3.2 
8 .2 
>% > 
TO u 
-I 
M— 
o O 
>%it 
TO o 
E o 
E ii 
13 > 
co 
csi 
0 
n 
TO 
O 
CO 
_0 
Cl 
E 
TO 
CO 
0 
TO 
O 
X 
TD 
C 
0 
Q- Cl 
< 'D 
RPDs and CVs 
of matrix spikes 
and reference 
materials <30%? 
No (33%) 
No (34%) 
Yes 
Recovery of 
matrix spikes 
within 50%- 
120%? 
Yes 
Yes 
Yes 
70% of 
analytes 
within ±35% 
of true 
value? 
Yes 
No 
Yes 
%of 
analytes 
within ±35% 
of true value 
100% 
53% 
74% 
Average % 
deviation from 
reference 
material within 
±30% of true 
value 
Yes 
No 
No 
Average % 
deviation from 
true value of 
reference 
material 
(# Analytes) 
16% (12) 
43% (22) 
32% (19) 
State 
California 
Oregon 
Washington 
m 
