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Plan for the 8th St. and Olympic Boulevard Pumping Plant, 1924, Los Angeles, California.

Source: Tom Bates Collection of Pumping Plant Plans, Lancaster, Pennsylvania.

Plan for the Earldom Avenue Sewage Pumping Plant Wet Well Structure, 1934, Los Angeles, California. Sheet 2 of 6.

Source: Tom Bates Collection of Pumping Plant Plans, Lancaster, Pennsylvania.

Plan for the Earldom Avenue Sewage Pumping Plant, 1934, Los Angeles, California. Sheet 3 of 6.

Source: Tom Bates Collection of Pumping Plant Plans, Lancaster, Pennsylvania.

Plan for Lankershim Boulevard Sewage Pumping Plant, 1939, Los Angeles, California. This includes the motor room, pump room, and sections. Sheet 2 of 5.

Source: Tom Bates Collection of Pumping Plant Plans, Lancaster, Pennsylvania.

Sewage Disposal Plant at Field's Point, Providence, Rhode Island. The plant includes a pumping station and press house. Plans date from 1895 to 1900. For further information, see History of Sewage Treatment in Rhode Island:

1884
Recognizing the need for a system to treat the waste, the City Council sends City Engineer Samuel M. Gray to Europe to study the latest methods of treating household and industrial waste. His recommendation: a system of interceptors by which sewage would be collected from neighborhood sewage lines and conveyed to Field's Point, a small peninsula on the west bank of the Providence River. There sewage would be processed by the chemical precipitation method, already in wide use in England.

1901
The Providence Sewage Treatment System is put into operation. The chemical precipitation plant, the third of its kind in the United States, is the largest of its type ever built. The system consists of a pumping station at Ernest Street to lift sewage to Field's Point for treatment.

Source: Paul Nordstrom of the Narragansett Bay Commission, and Tom Bates. Per Mr. Nordstrom: "When we took over some of the City of Providence facilities in the early [nineteen] eighties, we immediately tried to get the facility on the national historic register because we understood it to be one of the earliest in the country."