PetroLogistics Natural Gas Storage LLC

Original Volume No. 1

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Effective Date: 06/03/2009, Docket: RP09-577-000, Status: Effective

Original Sheet No. 10 Original Sheet No. 10

RATE STATEMENT IBTS – INTERRUPTIBLE IMBALANCE TRADING SERVICE*

Imbalance Trading Charge Market Based/ Negotiable $/Dth/time period

Payment is equal to the Imbalance Trading Charge specified in Exhibit B of Shipper's Hub

Services Agreement multiplied by Shipper's imbalance quantity traded.

All applicable taxes set forth in either the General Terms and Conditions of this FERC Gas

Tariff or Exhibit B of the Hub Services Agreement and all other applicable surcharges shall

also be paid by Shipper.

* All quantities of gas are measured in dekatherms (Dth).