NCS000533_Monitoring results_20230816

July 31, 2023
Stormwater Permitting Unite
Division of Water Quality
1617 Mail Service Center
Raleigh,NC 27699-1617
RE: 2023 Acute Toxicity Monitoring Report
To Whom It May Concern:
Enclosed is a copy of the DWQ Form for Acute Pass/Fail forms for July 2023 for Entegris, Inc
under Permit NCS000533 for Outfalls SW001, SW002, SW005, and SWO10. There was no flow
for acute toxicity samples to be pulled. We will work to pull AT samples during a qualifying rain
event as soon as possible. A copy of this was sent to NCDENR Environmental Science Section
and our Regional Office on July 31,2023
If you have any questions regarding this submittal, I can be contacted at(910) 655-4212 x101 or
[e-mail]
Regards, � / )�
&q W
Gina Ward
Environmental Safety and Health Specialist
Entegris, Inc
333 Neils Eddy Road
Riegelwood, NC 28456
p(910)-655-4212 ext.101
[e-mail]
ENTEGRIS PROPRIETARY AND CONFIDENTIAL-INTERNAL

Effluent Aquatic Toxicity Report Form -Acute Pass/Fail Date t1 t y
Facility /1 Z NPDES#NC.rlM( 53-3 pipe# County
Labonya -Perfo ing Test
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Signature r Operator in Responsible Charge OR61116 °i .mail r ^+
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Signature of Laboratory Supervisor
on, of
Water Sciences Section
MAIL ORIGINAL TO: Div. of Water Resources,NCDENR
1621 Mail Service Center
North Carolina Acute Pass/Fail Toxicitv Test Raleigh,NC 27699-1621
Collection Date: Organism Tested
Collection Time:
Test Start Date:
SampleTwe/Duration Control
Grab Com . Duration pH
Treatment
G x
c s
o m a
a d
Hardness(mg/1 r
Spec.Cond.(pmhos Control
Chlorine(mg/I D.O.
Treatment
Sample temp.at recei01 , -_M I
Mortality Replicate Mean Mortality
Treatment 1 (Control) A B C D
Treatment 2(Exposure) A B C D
Concentration
Tested F % I %I %1 77 F7
(NOTE:If mean control mortality exceeds10%.the test is considered invalid)
Calculate using
Arc-sine Calculated Student's t PASS
Square Root
transformed Tabular Student's t FAIL
data (ONE TAILED)
If the absolute value of the calculated r is less than or equal
to the absolute value of the tabular i. check PASS.
If the absolute value of the calculated t is greater than the
absolute value of the tabular t. check Fail..
If all vessels within each treatment have the same response
but the treaunent two response is greater than the control_check F_AM.
DWQformAT-2revised 9/2014