Senior Notes

Percentage 6.625%
Date of Maturity 8/15/2020
Date of Issuance 8/17/2010
Interest Payment Dates 2/15 & 8/15
Convertible? (Conversion Price) No
Optional Redemption? Yes
Optional Redemption Dates make whole call @ T + 50bps at any time prior to maturity
Listed on NYSE? Yes
NYSE Symbol CHK20A
CUSIP- 144A n/a
CUSIP- Registered/Common Code 165167CF2