 
		 
		 
		Norman Lofton inspects sewer at Ditman and Sheffield, 1987
 
		Sewer crawler Clarence Baskerville checks tunnel for leaks. He has faced the dangers of working in sewers for past three years, 1971
 
		Norman Lofton inspects sewer at Ditman and Sheffield, 1987
 
		Inspector looking for problems in sewer
 
		Sewer crawler Tom Cross, heading down the manhole at 26th and Grays Ferry, 1982
 
		General view of sewer looking up manhole as other Water Dept. personnel look down.
 
		Joe Cerrone, Inspector, Industrial Waste Unit, PWD, enters storm drain to search for source of oil spill, 1989
 
		Sewer worker Anthony Holston enters sewer, 1990
 
		Manholes like this give access to city’s sewer system, 1961
