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1906 – Before building a complete, City-wide sewerage system, a Testing Station was built to figure out the best means of treatment.

At Hampden and Walbrook, surveys were made and every house located, and in each place a plan for a comprehensive sewerage system was made. As a result of these studies Walbrook was selected as offering the most advantages.

Establishment of experimental testing station at Walbrook: In accordance with the Chief Engineer’s recommendation, the Commission on June 14th, 1906 authorized the erection of an experimental Testing Station. On October 2nd sufficient land was secured, without charge, from the Walbrook Land Corporation for the site of the Testing Station, for a period of seven years. On October 10th the contract for the erection of this testing station was awarded to the lowest responsible bidder, Malcolm W. Hill Company of Baltimore, Md., at their bid of six thousand, nine hundred and thirty dollars and forty-seven cents ($6,930.47). The contract for the Laboratory Building in connection with the Testing Station was awarded to the lowest responsible bidder, Wm. Kirkpatrick, of Baltimore, Md., on October 18th, at his bid of three thousand, seven hundred and fifty dollars ($3,750.00). The contract for the permanent sanitary sewers which will lead to the Testing Station was awarded to the lowest responsible bidder, M. A. Talbott & Company, of Baltimore, Md., on October 29th, at their bid of thirty-three thousand, two hundred and thirty dollars and ninety-eight cents ($33,230.98).

1907 – “Sir: In obedience to the requirements of Section I, Chapter 349, of the Acts of the General Assembly of Maryland for 1904, this Commission has the honor to make a report of its official transactions for the year 1907.” The first sanitary sewers to be constructed were those in Walbrook for the drainage of houses embraced within a prescribed area, and which were constructed as auxiliary to the experimental testing station, as part of the permanent system. Work on outfall sewer and interceptors was begun. There was criticism as to the size chosen for the sewers, but the Commission stuck to the plans of the advisory engineers: Rudolph Hering, Samuel Gray and Frederick Stearns.

These photos show constructing the Testing Station and Lab. Also the sprinkling filters.

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1908 sewage map walbrook

Here is the only reference I could find concerning the exact location of the Testing Plant.It comes from the Johns Hopkins Sheridan Library. I cut it down in size for viewing here. The location is never mentioned in any of the Annual Reports other than “Walbrook”. The testing plant is represented by the two circles at the bottom of the dark lines, just above Patterson Ave.

From Sewage Commissioner’s Report: The sewage testing part of the laboratory has been closed for a number of months, but the testing of all materials for construction work is being carried on, which has proved of great value in getting desired results. The plant is continuing to receive and purify the sewage carried to it from the system of sewers throughout Walbrook. On account of the disposal plant being operated by gravity, the cost of maintenance is reduced to a minimum.