May 15,2014 Mr. Lloyd Stone UNITED STATES ENVIRONMENTAL PROTECTION AGENCY RESEARCH TRIANGLE PARK, NC 27711

Corporate HSE Director Westlake Chemical Corporation 2801 Post Oak Blvd. Houston, Texas 77056 DearMr. Stone: OFFICE OF AIR QUALITY PLANNING AND STANDARDS

Pursuantto section 114 ofthe Clean Air Act (CAA), the U.S. Environmental Protection Agency (EPA) is collecting information to characterize hazardous air pollutant emissions from process vents at polyvinyl chloride and copolymer (PVC) production facilities. PVC production is subject to the provisions of40 CFRPart 63, Subparts HHHHHHH and DDDDDD. The purpose ofthis request is to gatherprocess vent data and other information necessary to inform our reconsideration ofthese emissions standards. We requestthe following testing be performedfor yourPVCproduction facility, Westlake Chemical Corporation- Calvert City, KY as specifically listed below and discussed in Attachment B (tables 1.1 and 1.6) ofEnclosure 1to this letter: Pollutants to be tested HCl TOHAP Dioxin Vinyl THC Chloride

We are also requesting other informationregarding PVC production at your facility and are providing the survey response forms in Microsoft® Excel spreadsheet format. Testresults that are collected using test methods that are supported by EPA's Electronic Reporting Tool (ERT) must be submitted using the ERT. We are also providing PVC process vent response forms inMicrosoft® Excel spreadsheet format for test methods that are not supported bythe ER T. Please see Enclosure 1, Attachment B for specific ER T submission instructions. The requested testing is designed to collect information on emissions and other relevant aspects ofPVC process vents. Enclosure 1contains a summary ofthe information we are requesting. Supplemental information is contained inthe following enclosures:

Internet Address (URL) • http://www.epa.gov Recycled/Recyclable • Printed wnh Vegetable Oil Based Inks on Recycled Paper (Minimum 25% Postconsumer)

### Description Enclosure# MaximumAchievable Control Technology Enclosure I (MACT) Standards Development Information Collection Request Section 114 Authority and CBI claims Enclosure 2 CBI emissions data disclosure Enclosure 3 Designation ofERG as authorized representative Enclosure 4 Policies and Procedures for handling CBI Enclosure 5 Certification Statement Enclosure 6 2014 PVC 114 Process Vent Testing Workbook N/A 2014 PVC 114 Process Vent Testing Workbook NIA Example
The testing request is designed to collect emissions information, which by law cannotbe confidential information. You are required to return all requested information on or before 

### November 17, 2014. Please e-mail the completed non-confidential survey and testing workbook response to: 

### CCG-PVC@epa.gov There is a small amount ofinformationrequested in the survey concerning production and production capacity which youmay seekto claim as confidential. Ifyou are submitting confidential business information (CBI) as described inEnclosure 3, youmustmail a separate CD-ROM or DVD-ROM disk containing onlythe CBIportion ofyour datato EPA. Clearlymarkthe disk with the words "Confidential Business Information" and sendvia U.S. Postal Service Express Mail, registered mail, orprivate courierto: Jodi Howard U.S. Environmental Protection Agency OAQPS/SPPD/RCG (Mail Code El43-0l) 109 T.W. Alexander Drive Research Triangle Park, NC 27711 DO NOTELECTRONICALLY TRANSMIT CONFIDENTIAL BUSINESS INFORMATION TO EPA. Ifyou would like to use the required Section 114 testing to satisfy the initial compliance requirements for process vents inthe PVC rules (40 CFRpart 63, subparts DDDDDD and HHHHHHH), please contact Region 4 to discuss the requirements prior to beginning the 114 testing.Be aware thatthere are significantpenalties for submitting false information, including the possibility of fines and imprisonment as explained in Section 113 ofthe CleanAirAct (42 USC §7413). Failure to comply fully withthis request for informationmay subject youto an enforcement action. We may use any information submitted inresponse to this request in an administrative, civil, or criminal action. Ifyouhave questions regarding this request, please contactMs. Jodi Howard, Refining and Chemicals Group, at (919) 541-4607 orhoward.jodi@epa.gov. Thank you for your assistance inthis effort.

6 Enclosures Sincerely,

# a~ Penny L · siter Group Leader Refining and Chemicals Group Sector Policies and Programs Division

cc: Kevin Bloomer, Westlake Chemical Corporation, (electronically) w/Enclosures Beverly Banister, USEPA, Region 4, Air Division Director, w/Enclosure 1 only Keith H. Talley, KYNatural Resources and Environmental Protection, Division ofAir Quality, w/Enclosure 1 only