Scope and Contents

Page 9a: Two Greyscale Photos [10/5/71] View of downstream portal of River Outlet Works. [10/5/71] View of bottom of canyon at dam axis. Page 9b: Two Greyscale Photos [10/5/71] View of Test Pit C-202. [10/5/71] View of Test Pit C-201.

Scope and Contents

Page 10a: Two Greyscale Photos [10/25/72] View of grout cap excavation station 11+60 to 11+85 in Foundation Key trench. [10/25/72] Workers are scaling Foundation Key trench walls between station 11+95 to 12+50. Page 10b: Two Greyscale Photos [1/18/73] View of Foundation Key trench in right abutment. [2/1/73] View of unstable rock conditions caused by undercutting by contractor above right abutment access road approximately 300 ft. upstream from station 15+00 on right abutment Keyway.

Scope and Contents Page 11a: Two Greyscale Photos [2/22/73] View looking down Foundation Key trench on right abutment from approximate station 12+00 to 14+00. [2/8/73] View of two laborers scaling loose rock approximately 100 ft. upstream of station 13+00 on Foundation Keyway. Page 11b: Two Greyscale Photos [3/20/73] View of rock conditions on the right abutment taken from about Station 14+75, 75 feet upstream of the foundation key trench. [3/20/73] View of rock conditions on the right abutment at about...

Scope and Contents Page 12a: Two Greyscale Photos [3/20/73] View of Contractor’s employees using an air hose to remove loose rock from the grout cap excavation at about Station 13+50 of the grout cap in the foundation keyway trench on the right abutment. [6/28/73] View of Grout Cap Tench in right keyway trench area Station 11+50 to 12+60. Page 12b: Two Greyscale Photos [6/25/73] View of right keyway trench and cutoff trench, Station 11+50 to 22+50, centerline of dam. [6/25/73] View of downstream wall of right...

Scope and Contents

Page 13a: Two Greyscale Photos [6/25/73] View of upstream wall of right keyway trench. [6/26/73] View showing placement of Zone 2 material, Station 17+50 to 18+50 100 feet to 600 feet downstream from centerline of dam. Page 13b: Two Greyscale Photos [7/2/73] View of keyway trench on right abutment, and Zone 5 and Zone 2 excavation in cutoff trench. [7/11/73] View of right abutment after Zone 5 material has been removed and scalers are cleaning up.

Scope and Contents Page 14a: Two Greyscale Photos [7/12/73] View of grout cap trench, Station 11+31.8 to 11+42.5 showing “J” bars after being grouted in place. [7/16/73] View of grout cap trench after concrete has been placed, Station 10+31.8 to 11+42.5. Page 14b: Two Greyscale Photos [7/19/73] View of right foundation keyway trench and Zone 5 stockpile, also showing portion of spillway area. [7/19/73] View of where Zone 4 material has been excavated down to bedrock overhand, Station 17+50 to 17+75 from 100...

Scope and Contents

Page 15a: Two Greyscale Photos [8/8/73] View of right abutment showing overhanging rock ledge at Elevation 5006.0 before being shot. [8/9/73] View of right abutment and cleaning up work still being done. Page 15b: Two Greyscale Photos [8/13/73] View of right abutment and two air drills line drilling overhanging rock ledge. [8/21/73] View of clay layers approximately 20 feet upstream from centerline of dam, Station 19+50 to 18+75.

Scope and Contents

Page 16a: Two Greyscale Photos [8/21/73] View of water seeping out of pervious material (sand and gravel) above clay bed, 210 feet upstream from centerline of dam, Station 22+30 to 22+50. [9/27/73] View of the cutoff trench showing grout cap complete across bottom. Page 16b: Two Greyscale Photos [9/17/73] Grout cap trench, Station 17+80 to 19+20. [8/22/73] View of grout cap trench after drilling, Station 17+50 to 17+75.

Scope and Contents Page 17a: Two Greyscale Photos [9/26/73] View of Contractor getting ready to place concrete in grout cap trench Station 16+49 to 16+28. [10/24/73] View of laborers hand compacting backfill around toe drain pump sump at Station 19+70, 175 feet upstream from center line of dam. Page 17b: Two Greyscale Photos [10/9/73] View of grout cap looking toward right abutment in Cutoff Trench. [10/18/73] View of second load of Zone 1 material placed in Cutoff Trench with conveyor contractor has set...

Scope and Contents 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...