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SITE SUMMARIES (continued)

Site: HR2alt

Priority: Primary

Position: 44.57031°N, 125.074193°W

Water Depth: 1210 m

Sediment Thickness: >7 km

Target Drilling Depth: 620 mbsf

Approved Maximum Penetration: 620 mbsf

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

Objectives: To establish the source and distribution of gas hydrate in this setting, which is characterized by rapid deposition of terrestrial sediments. This site provides a test of the generality of models for hydrate formation in a region of rapid sedimentation developed from results of Leg 164.

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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