Common use of ACKNOWLEDGED AND AGREED TO BY Clause in Contracts

ACKNOWLEDGED AND AGREED TO BY. DELTA EXPLORATION COMPANY, INC., a Colorado corporation By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer PIPER PETROLEUM COMPANY, a Colorado corporation By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PETROLEUM CORPORATION CASTLE TEXAS EXPLORATION LIMITED PARTNERSHIP, a Texas limited partnership By: Delta Petroleum Corporation, a Delaware corporation, its general partner By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DPCA LLC, a Delaware limited liability company By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PIPELINE, LLC, a Colorado limited liability company By: Delta Petroleum Corporation, a Delaware corporation, its sole manager and sole member By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA RISK MANAGEMENT, LLC, a Colorado limited liability company By: Delta Petroleum Corporation, a Delaware corporation, its sole manager and sole member By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PETROLEUM CORPORATION ADMINISTRATIVE AGENT: JPMORGAN CHASE BANK, N.A., as Administrative Agent By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇, Vice President BANK: By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇, Vice President DELTA PETROLEUM CORPORATION BANK: By: /s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ Director DELTA PETROLEUM CORPORATION BANK: By: Name: Title: By: Name: Title: DELTA PETROLEUM CORPORATION BANK: By: Name: Title: DELTA PETROLEUM CORPORATION BANK:

ACKNOWLEDGED AND AGREED TO BY. DELTA EXPLORATION COMPANY, INC., a Colorado corporation By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer PIPER PETROLEUM COMPANY, a Colorado corporation By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PETROLEUM CORPORATION CASTLE TEXAS EXPLORATION LIMITED PARTNERSHIP, a Texas limited partnership By: Delta Petroleum Corporation, a Delaware corporation, its general partner By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DPCA LLC, a Delaware limited liability company By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PIPELINE, LLC, a Colorado limited liability company By: Delta Petroleum Corporation, a Delaware corporation, its sole manager and sole member By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA RISK MANAGEMENT, LLC, a Colorado limited liability company By: Delta Petroleum Corporation, a Delaware corporation, its sole manager and sole member By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇ ▇. ▇▇▇▇▇, Chief Financial Officer and Treasurer DELTA PETROLEUM CORPORATION ADMINISTRATIVE AGENT: JPMORGAN CHASE BANK, N.A., as Administrative Agent By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇, Senior Vice President BANK: By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇, Senior Vice President DELTA PETROLEUM CORPORATION BANK: By: /s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇ Title: Director DELTA PETROLEUM CORPORATION BANK: By: /s/ ▇▇▇▇▇ ▇▇▇▇▇▇▇ Name: ▇▇▇▇▇ ▇▇▇▇▇▇▇ Title: Vice President By: /s/ ▇▇▇▇ ▇▇▇▇▇▇▇▇▇ Name: ▇▇▇▇ ▇▇▇▇▇▇▇▇▇ Title: DELTA PETROLEUM CORPORATION Vice President BANK: By: /s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ Name: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ Title: DELTA PETROLEUM CORPORATION Senior Vice President BANK: