N ov e m ber 30, 2 00 7

M r. R ic har d M a ruy a

A. S. T rus t & H o ldi ngs

PP P 46 9 B ox 10 00 0

Sai pa n, M P

D ear M r. M aruy a:

F o llo w in g a rev i e w of t he c a lc ul at io ns c ont a in ed w it hin As s es s m e nt of En d

- U s e Oc c u pat io na l an d

R es id ent i al Oc c u pa nt Ex p os ur es t o H C R

- 18 8 C

, A Saf e Alt er nat iv e H y droc ar bo n R ef ri ger ant f or

W

hit e Goo ds Sy s t e m s

, ( M ay 20 07 ) an d t hr ee s u b s equ ent a m en d m ent s pr ep are d in J u ly an d

N ov e m ber 20 07, Al as k a I n dus t ri al H y gi en e Se rv ic es (AI H S ) has c o nf ir m ed a n er ror i n t he

c alc ul at io ns as s oc i at ed w it h oc c u pat io na l ex p os ur es t o H C R

- 1 88 C

. T he c a lc ul at io n err or is re lat e d

t o t he s iz e of t he “ box ” us e d f or c alc u lat i ng oc c up a t iona l ex p os ur es t o H C R

- 1 88 C dur in g hos e

c onn ec t io n/ dis c o nn ec t io n c y c les

.

I n t he ori gin al ris k as s es s m e nt doc u m e nt an d t he t hre e a m en d m e nt s

, a v alu e of 9 c ub ic f eet (0. 2 6

c ubic m et ers ) w as us ed f o r t he c alc ulat i ons

. T he c orrec t v al ue t h at s ho uld hav e be en us ed is 2 7

c ubic f eet ( 0. 76 46 c u bic m et ers ). T he “ box ” w as d es c rib ed as bei ng 3 f e et by 3 f eet by 3 f eet

(eq uiv a lent t o 2 7 c ub ic f eet ), but w h en t h e c alc ulat ions w e re p erf o r m e d, t he inc orr ec t v alu e of 9

c ubic f eet w as us ed. T h e c alc u lat io ns af f ec t e d by t his err or w er e us e d t o d et er m i ne pe ak an d

t im e

- w e ig ht ed av er ag e ex p os ur es ex p res s ed in p art s per m i llio n (p p m ) by v olu m e f or a

ref rig er at io n t e c hn ic ia n pe rf or m i ng pro duc t s erv ic i ng ac t iv it i es

. T h e c alc u lat e d pe ak ex p os u re

v alu e w as als o us e d t o ev al uat e f la m m abi lit y c onc erns ex pr es s ed as a pe rc e nt ag e of t he l o w er

f la m m a bilit y li m it ( L F L) of H C R

- 1 88 C

.

AI H S rec alc u lat e d t he p ot e nt ial ex pos ures c ont ai n ed in t h e ori gi nal ris k as s es s m e nt an d t hre e

a m e nd m ent s

. T he r ec alc ulat e d v al ues a re p res e n t ed in t h e t abl es bel o w

. As c an be s e en by t h e

dat a, t he c o rrec t ed ex pos ure v alu es ar e lo w er t ha n t he or igi nal v alu es as a res ult of t he c alc ul at ion

erro r.

T ab l e 1: C o r r ec te d V al u e s f o r M ay 20 07 A s se s sm e n t

– R efr i g er at o r

V o l u m e o f H C R

- 1 88 C

(0. 2 % o f C h ar g e R ate ) Pe ak E x p o s u r e

(p p m) 8

- H o u r T W A

Ex p o s u r e ( p p m) % o f t h e L F L

Ori gin al 112. 4 Ori gin al 1. 9 Ori gin al 0. 5 0. 05 66 g ra m s

C orr ec t ed 36. 7 C orr ec t ed 0. 6 C orr ec t ed 0. 2

Ori gin al 157. 2 Ori gin al 2. 6 Ori gin al 0. 8 0. 07 92 g ra m s

C orr ec t ed 51. 4 C orr ec t ed 0. 9 C orr ec t ed 0. 3M r

. R i c h a r d M a r u y a

A

. S

. T r u s t & H o l d i n g s

N o v e m b e r 3 0

, 2 0 0 7

P a g e 2 o f 2

T ab l e 2: C o r r ec te d V al u e s f o r J u l y 2 00 7 A m e n d me n t

– W i n d o w A i r C o n d i ti o n er a n d St a n d

A l o n e F r e ez er

V o l u m e o f H C R

- 1 88 C

(0. 2 % o f C h ar g e R ate ) Pe ak E x p o s u r e

(p p m) 8

- H o u r T W A

Ex p o s u r e ( p p m) % o f t h e L F L

Ori gin al 495. 3 Ori gin al 8. 3 Ori gin al 2. 5 0. 24 95 g ra m s ( w ind o w ai r

c ond it ion er) C orr ec t ed 162. 0 C orr ec t ed 2. 7 C orr ec t ed 0. 8

Ori gin al 484. 0 Ori gin al 8. 1 Ori gin al 2. 4 0. 24 38 g ra m s ( w ind o w ai r

c ond it ion er) C orr ec t ed 158. 3 C orr ec t ed 2. 6 C orr ec t ed 0. 8

Ori gin al 158. 8 Ori gin al 2. 7 Ori gin al 0. 8 0. 08 g ra m s (f r eez er)

C orr ec t ed 51. 9 C orr ec t ed 0. 9 C orr ec t ed 0. 3

T ab l e 3: C o r r e c te d V al u e s f o r N o ve m b er 200 7 A me n d m e n t

– W i n d o w A i r C o n d i ti o n er

V o l u m e o f H C R

- 1 88 C

(0. 2 % o f C h ar g e R ate ) Pe ak E x p o s u r e

(p p m) 8

- H o u r T W A

Ex p o s u r e ( p p m) % o f t h e L F L

Ori gin al 968. 1 Ori gin al 16. 1 Ori gin al 4. 8 0. 48 76 g ra m s

C orr ec t ed 316. 5 C orr ec t ed 5. 3 C orr ec t ed 1. 6

T ab l e 4: C o r r ec te d V al u e s f o r N o ve m b er 200 7 A me n d m e n t

– S ta n d A l o n e F r e ez er

V o l u m e o f H C R

- 1 88 C

(0. 2 % o f C h ar g e R ate ) Pe ak E x p o s u r e

(p p m) 8

- H o u r T W A

Ex p o s u r e ( p p m) % o f t h e L F L

Ori gin al 166. 0 Ori gin al 2. 8 Ori gin al 0. 8 0. 08 36 g ra m s

C orr ec t ed 54. 3 C orr ec t ed 0. 9 C orr ec t ed 0. 3

Ori gin al 211. 0 Ori gin al 3. 5 Ori gin al 1. 1 0. 10 62 g ra m s

C orr ec t ed 68. 9 C orr ec t ed 1. 1 C orr ec t ed 0. 3

I f y ou hav e a ny q ues t io ns or r eq uir e ad dit io na l inf or m at i on r elat ed t o t his l et t er, ple as e d on ’t

hes it at e t o c ont ac t m e at y our e arl ies t c onv eni enc e by t ele ph on e at 90 7

- 33 6

- 2 44 7 or by e m ai l at

dbu rk s @ ac s al as k a. n et

.

T h ank y ou.

Sinc ere ly

,

D arr en D

. Bu rk s

, C I H

, C S P