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SITE SUMMARIES (continued)

Site: HR4c

Priority: Primary

Position: 44.577631°N, 125.150153°W

Water Depth: 830 m

Sediment Thickness: ~7 km

Target Drilling Depth: 240 mbsf

Approved Maximum Penetration: 240 mbsf

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

Objectives: To sample the hydrate stability zone and underlying reflection A updip from proposed Site HR3a. This site is designed to define updip variability along reflection A and is needed for evaluating the feasibility of a future experiment to measure temporal evolution of fluid flow.

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.

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

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