V a r i abil i t y i n Ca d m i u m Con c en t r a t i on s

Robe r t Do m i na k

t o : A m y H a m b r i ck

03 / 29 / 2010 02 : 03 PM

C c : R S CH M I D T

, M i c hael G a l b r a i t h

, Ron My e r s

, K e t an P a t e l

, S u z anne Rud z i n s k i

, R i ck S t e v en s

, " M a r k

F e l t ne r "

, CHo r nba ck

, k j one s

, " E l i z abe t h T oo t

- L e v y "

S ho w De t a il s

G ood A ft e r noon A m y

,

O ne o f t he i ss u e s t ha t w e ha v e been d i s c u s s i ng i s how m e t a l c on c en t r a t i on s i n b i o s o li d s v a ry f r o m P O T W t o

P O T W and w i t h i n a P O T

W f r o m t e s t t o t e s t.

N A C W A ob t a i ned da t a f r o m 23 P O T W s t ha t p r a c t i c e i n c i ne r a t i on on t he c a d m i u m c on c en t r a t i on s i n t he i r

b i o s o li d s f o r t he pe r i od o f J anua ry 1

, 2005

- De c e m be r 31

, 2009

. A l l da t a s hou l d be c on s i de r ed p r o v i s i ona l

a t t h i s po i n t i n t i m e

.

T he da t a w e r e ana l yz ed and c ha r t ed b y No r t hea s t O h io Reg i ona l S e w e r D i s t r i c t pe r s onne l

.

T he a tt a c hed s p r ead s hee t c on t a i n s t he f ol l o w i ng w o rks hee t s :

1

. Ca d m i u m i n b i o s ol i d s c on c en t r a t i on d a t a ( m g / d r y k g ) f o r ea c h o f t h e 23 P O T W s

.

2

. A b o x and w h i s k e r c ha r t f o r ea c h o f t he 23 P O T W s

. It s hou l d be no t ed t ha t:

a

. T he bo x s how s w he r e 75% o f t he d a t a f a l l

. T he l a r ge r t he bo x

, t he g r ea t e r t he v a r i abil i t y o f

t he c on c en t r a t i on s

. b

. T he l i ne i n t he b o x i s t he o v e r all m ed i an c on c en t r a t i on

.

c

. T he l i ne s a t t h e t op and bo t t o m o f t he w h i s k e r s a r e t he h i ghe s t and l o w e s t r e c o r ded

c on c en t r a t i on s

. d

. Non

- de t e c t s w e r e a s s u m ed t o be 50% o f t he de t e c t i on l i m i t.

e

. A l l da t a i s r epo r t ed on a m on t hl y ba s i s

.

3

. A c ha r t s ho w i ng a ll o f t he m on t h l y da t a po i n t s f o r t h e 23 P O T

W s

4

. A c ha r t s ho w i ng a c l o s e

- up v e r s i on o f al l o f t he m on t h l y c a d m i u m c on c en t r a t i on s unde r 10 m g / d ry k g f o r

t he 23 P O T

W s

.

A s an e x a m p l e

, m a

j o r di ff e r en c e s c an be s een be t we e n P OT W B and P OT W I

. P OT W B' s c a d m i u m

c on c en t r a t i on s w e r e a ll b e l o w t he de t e c t i on l i m i t

, w h il e P O T W I ' s c a d m i u m c on c en t r a t i on s r anged f r o m 4

-

44 m g / d ry k g

.

W e a r e c u rr en t l y p r epa r i ng s i m i l a r c ha r t s s h o w i ng t he lead and m e rc u r y c on c en t r a t i on s i n b i o s o li d s a t t he 23

P O T W s

.

P l ea s e do no t he s i t a t e t o c on t a c t m e i f y ou h a v e an y q ue s t i on s o r r equ i r e add i t i ona l i n f o r m a t i on c on c e r n i ng

t he c on t en t s o f t he a tt a c hed s p r ead s hee t.

T han k s

,

B ob Do m i na k

Co

- Cha i r N A C W A B i o s o li d s M anag e m en t C o mm i tt ee

Re s i dua l s & A i r E m i ss i on s M anage r

No r t hea s t O h i o Re g i ona l S e w e r D i s t r i c t

3900 E u c li d A

v enue

C l e v e l and

, O H 44134

P hone : 216

- 881

- 6600 e x t

. 6405

E-M ai l : d o m i na kr @ neo r s d

. o rg