Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^{F1,F2,F3,F4,F5}	Mar 19, 2018	S	9,524,997	$21.285	D	36,447,602	I	See footnotes
Common Stock^{F1,F2,F3,F4,F5}	Mar 21, 2018	S	1,428,749	$21.285	D	35,018,853	I	See footnotes

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1These shares of common stock were sold pursuant to the Underwriting Agreement dated March 14, 2018.
F2This amount represents the $22.00 public offering price per share of the issuer's common stock less the underwriting discount of $0.715 per share.
F3These shares of common stock of the issuer are directly held by AEA EWT Holdings LP ("AEA EWT Holdings"), whose general partner is AEA EWT Holdings GP LLC ("AEA EWT Holdings GP"). The managing member of AEA EWT Holdings GP is AEA Investors Fund V LP and its other members are (i) AEA Investors Participant Fund V LP, (ii) AEA Investors QP Participant Fund V LP, (iii) AEA Investors Fund V-A LP and (iv) AEA Investors Fund V-B LP (AEA Investors Fund V LP and the entities named in clauses (i) through (iv), collectively, the "AEA Funds"). The AEA Funds are also limited partners of AEA EWT Holdings. The general partner of each of AEA Investors Participant Fund V LP and AEA Investors QP Participant Fund V LP is AEA Investors PF V LLC, whose sole member is AEA Investors LP. The general partner of each of AEA Investors Fund V LP, AEA Investors Fund V-A LP and AEA Investors Fund V-B LP is AEA Investors Partners V LP, whose general partner is AEA Management (Cayman) Ltd.
F4Each of AEA EWT Holdings GP, the AEA Funds, AEA Investors PF V LLC, AEA Investors Partners V LP, AEA Investors LP and AEA Management (Cayman) Ltd. may be deemed to share beneficial ownership of the shares of the issuer's common stock held of record by AEA EWT Holdings, but each disclaims beneficial ownership of such shares, except to the extent of its respective pecuniary interest therein. John L. Garcia, the Chairman and Chief Executive Officer of AEA Investors LP and the sole stockholder and director of AEA Management (Cayman) Ltd., may also be deemed to share beneficial ownership of the shares of the issuer's common stock held of record by AEA EWT Holdings, but Dr. Garcia disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein.
F5Due to the limitations of the Securities and Exchange Commission's EDGAR system, AEA Investors Fund V LP, AEA Investors Fund V-A LP, AEA Investors Fund V-B LP, AEA Investors Partners V LP, AEA Management (Cayman) Ltd. and John L. Garcia have filed a separate Form 4.