DEQ-CFW_00024887

From: Culpepper, Linda [/O=EXCHANGELABS/OU=EXCHANG[ADMINISTRATIVE GROUP
(FYD|BOHF2]SPDLT)/CN=REOP|ENTS/CN=73D475CBAE324A29B87E171IDC9A79C5-UNCULPEPPER]
Sent: 8/17/I0I77:47:39PW1
To: 6oyb,Julie [/h=ExchangeLabs/ou=ExzhanXeAdministrative Group
(FYD|8OHFZ33PDO)/cn=Redpient$cn=75d1654d45154cZabbO8596aZc9atIQI-jaXrzyb]
Subject: Re: SenXt-testresult
Thanks for the remincleffl
Sent from my iPhone
On Aug 17, 2017, at3:0S PM, Grryb Julie wrote:
Linda,
Oh my, I sent this to you the same day you asked for it — I should have followed up but here ya go
Fronm:Grryb Julie
Sent: Thursday, August lU 20173:39PK8
To: Culpepper, Linda
Subject: FVV: GenXt'test result
Linda,
One of our PhD engineers ran both T-test and ANOVA p values to assess if there was any significant
difference.
See chart onfirst attached file and graphs onthe other.
There isnosignificant difference betmeen'
l. <!—[if !uupportLists]—><!—[endif] —>TestAmerica Data comparing 8|aden Bluffs Raw to Finished
water
2. <!—[if!supportLbts—><!—[endif] —>Tes America Data comparing International Paper Raw to
Finished water
3. <!--[if !supportLists]--><!--[endif]-->EPA data International Paper Raw to Finished water
VVealso did alab comparison and found nosignificant difference between
l. <!—[if !uupportLists]—><!—[endif] —>TestAmerican data verses EPA data — International Paper
Raw water
2. <!—[if!supportLbts—><!—[endif] —>Tes American data verses EPA data International Paper
Finished water
Let meknow ifyou need anything else,
Julie
From: 8ai,Bing
Sent: Thursday, August 1O 20173:03PIVI
To: Grzyb,Julie
Subject: GenX t-test result
MM
I ran a quick t-test and one-way ANOVA, no statistical difference existed between raw and finished
samples, and no statistical difference between two labs. That's all we can interpret from only 5-6 data
points, given too much variation.

Bing Bai, Ph.D.
Engineer
NPIDES Complex Permitting
NC DEQ / Division of Water Resources / Water Quality Permitting
9198076389
[e-mail]
512 North Salisbury St.
1617 Mail Service Center, Raleigh, NC, 27699-1617
C
<GenX t-test.pdf>
<GenX t-test figure.pdf>
DEQ-CFW-00024888