30121 289 Lin. Ft. 12" Dia. Combined Sewer, Class "C" Bedding. 30151 3 Lin. Ft. 15" Dia. Combined Sewer, Class "C" Bedding. 30181 203 Lin. Ft. 18" Dia. Combined Sewer, Class "C" Bedding. 30211 186 Lin. Ft. 21" Dia. Combined Sewer, Class "C" Bedding. 30271 312 Lin. Ft. 27" Dia. Combined Sewer, Class "C" Bedding. 30361 1030 Lin. Ft. 36" Dia. Combined Sewer, Class "C" Bedding (Modified). 30421 428 Lin. Ft. 42" Dia. Combined Sewer, Class "C" Bedding (Modified). 35361 3 Lin. Ft. 29"x 45" H.E. Combined Sewer, Class "C" Bedding. 43400 5 Each 4'-0" Dia. Combined Manhole. 43500 6 Each 5'-0" Dia. Combined Manhole. 43600 4 Each 6'-0" Dia. Combined Manhole. 43700 1 Each 7'-0" Dia. Combined Manhole. 50000 339 Lin. Ft. Building Sewers & Drains.