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1981. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2914NA Klamath Project - Oregon-California. View of trencher unit beginning a new drain line. Note plastic pipe in hopper unit. It was left there to keep chute from filling up with dirt and cinders ...Citation -
1982. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2915NA Klamath Project - Oregon-California. View of operator's control panel mounted on Hoes Gigant trenching machine; December 1972; Bureau of Reclamation photo by D. W. SteinCitation -
1983. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2916NA Klamath Project - Oregon-California. View of trenching equipment in operation; December 1972; Bureau of Reclamation photo by D. W. SteinCitation -
1984. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2917NA Klamath Project - Oregon-California. View of trenching equipment. The trencher is almost at the end of a newly installed closed drain line. Note the workman threading a short section of ...Citation -
1985. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2918NA Klamath Project - Oregon-California. View of digging and hopper unit being raised out of the open trench at the end of a completed drain line; November 1972; Bureau of Reclamation photo ...Citation -
1986. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2919NA Klamath Project - Oregon-California. View of pipe trenching equipment in operation; November 1972; Bureau of Reclamation photo by D. W. SteinCitation -
1987. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2920NA Klamath Project - Oregon-California. Inspector Derrill Stein is shown in foreground. He is watching the construction operation to see that the work performed by the contractor meets the ...Citation -
1988. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2921NA Klamath Project - Oregon-California. Side view of trenching equipment in operation. Note how the plastic drainage tubing is stretched out in advance of the trenching machine; November ...Citation -
1989. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2922NA Klamath Project - Oregon-California. View of trenching machine. Hopper unit and digging chain have been lifted out of ground; November 1972; Bureau of Reclamation photo by D. W. Stein...Citation -
1990. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor
P12-200-2923NA Klamath Project - Oregon-California. View of trenching machine starting to excavate a cutoff trench at the outlet end of a closed drain line; November 1972; Bureau of Reclamation photo ...Citation