Page 18a: Two Greyscale Photos [10/15/73] View of workmen cleaning rhyolite in bottom of Cutoff Trench. [10/15/73] Bottom of cutoff trench and right abutment, wall at approximately Station 17+75, 150 feet upstream to 100 feet upstream from centerline of dam. Page 18b: Two Greyscale Photos [10/31/73] View of laborer cleaning up in rock along grout cap at Station 17+55, 100 feet upstream from centerline of dam. [11/1/73] View of laborer compacting Zone 1 material along right abutment with plate tamper.