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SITE SUMMARIES (continued)

Site: HR2altB

Priority: Alternate

Position: 44.57031°N, 125.074193°W

Water Depth: 1200 m

Sediment Thickness: ~7 km

Target Drilling Depth: 650 mbsf

Approved Maximum Penetration: 650 mbsf

Seismic Coverage: TTN112 3-D high-resolution seismic survey

Objectives: To establish the source and distribution of gas hydrate in a slope basin characterized by rapid deposition of terrestrial sediments (same as proposed Site HR2alt; this site would be drilled if problems were encountered at proposed Site HR2alt).

Drilling Program: APC to refusal, XCB to refusal, RCB as necessary to reach target depth. At least two holes. Use of PCS and/or HYACE.

Logging and Downhole Program: LWD, triple combo, APC-temperature, DVTP, APC methane tools; VSP, walkaway VSP.

Nature of Rock Anticipated: Interlayered silts and clays, some authigenic carbonates possible.

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