Watching workers clearing muck from a river bed

University of Bristol - Historical Photographs of China reference number: Ep01-757. A foot operated water pump in action. Readble characters: On the metal arch, from right to left: 豆米?業私立商業[?] Dou mi? ye sili shangye [?] [=bean rice? (…) industry? private business/commerce (…)]. On the column on the right: first character on top is 山 shan. On the column on the left: first character on top in 湖 hu. Possibly the entrance to a factory building or to a commercial company?