Photo depicts four workers on the "Prepakt" intrusion grout pumping jumbo. Insert valves and hoses run from the pumping jumbo.
Notes
Alcan ID no. KR-1476. -- Job occurred over a two-day period, November 23-24, 1953. -- Four holes are pumped simultaneously and average advance of grouting approximately 4' per hour. -- Prepakt aggregate are small rocks poured in around liner. Alcan Collection
