South Essex Sewerage District Salem, Mass
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COMMONWEALTH OF MASSACHUSETTS South Essex Sewerage District S : Salem, Mass. TWELFTH REPORT COVERING FROM DECEMBER 31, 1936 TO DECEMBER 31, 1937 NEWCOMB & GAUSS CO., Printer, Salem, Massachusetts COMMONWEALTH OF MASSACHUSETTS South Essex Sewerage District Salem, Mass. TWELFTH REPORT COVERING FROM DECEMBER 31, 1936 TO DECEMBER 31, 1937 % THE SOUTH ESSEX-"SEWERAGE BOARD . JAMES B. RYAN, Chairman JAMES W. BL'ACHMEK; • ; • •., ..ElRtEK I’ MORSE Commissioner of Public Works City Engineer Beverly, Mass. Salem, Mass. A. PRESTON CHASE CHARLES A. MOGAVERO Representative Commissioner of Public Worl Town of Danvers, Mass. Peabody, Mass. «u üF «äSÜÄGÜüSEl y 27 \m Stt. u. run ■ 4 6 2 3 - 3/13 3 7 Z*. 1 9 3 7 3 , Salem, Mass., December 31, 1937. To the Governor of the Commonwealth, To the County Commissioners of Essex County, The Mayor of Salem, The Mayor of Beverly, The Mayor of Peabody, The Chairman of the BoarD of Selectmen of the Town of Danvers. Gentlemen : The South Essex Sewerage BoarD, createD by anD or ganized unDer chapter 339 of the acts of the year 1925, herewith submits its twelfth annual report, covering the year 1937. There have been no changes in the personnel of the BoarD During the year. CONSTRUCTION Construction Program No new construction was unDertaken by the BoarD Dur ing 1937. Grease and Grit Chamber The grounDs arounD the Grease anD Grit Chamber, completed last year unDer a P. W. A. project, have been graDeD anD seeded, anD the item of incluDing the cost of the lanD for FeDeral grant in the project, which haD at first been incluDeD in the project anD later DisapproveD, was again taken up with the P. W. A. authorities anD again disapproved. Construction Apportionments The annual apportionment of construction charges has been made, baseD on sewage flow measurements anD the valuations of the various cities, town, anD institutions of the District as furnisheD by the Commissioner of Corpora tions anD Taxation, in accorDance with section 1 of chapter 22 of the acts of 1929. MAINTENANCE Sewers DANVERS AND BEVERLY TRUNK SEWER The connecting branches of this sewer for the various State anD County institutions in Danvers anD Middleton, which are maintaineD by the institutions as prescribeD in section 14 of chapter 339, acts of 1925, have been inspecteD anD are in good conDition. 3 A large amount of rags are removed from the screen at the Danvers State Hospital, anD the siphon to the MiDDle- ton colony of this institution is flushed perioDically. from the institutions to the Nichols Street flume meter, inspections show the sewer to be flowing free from obstruc tions anD the meter has functioneD well throughout the year. From Nichols Street to the Danvers Pumping Station, anD on to the Beverly Pumping Station, the sewer has reQuireD little attention. However, perioDical inspections have been made, anD at the overflow chamber at Salter’s Point on the Bass River, it was founD on one occasion that some boys haD opened the cover anD DroppeD about 2 cubic yarDs of large rocks into the sewer, which were removed. Five more houses have been connected to this sewer in Danvers, anD one in Beverly, making a total of 57 now connected, besiDes the St. John’s Normal College. PEABODY AND SALEM TRUNK SEWER Cleaning operations have been carrieD on in this sewer During the year to remove the large amounts of heavy soliDs that Deposit throughout the length of the sewer. This work is now being done in the Daytime, rather than at night as before, anD the settleD material DraggeD to the new Grease anD Grit Chamber at the lower end of the sewer in Salem, for removal. This is a more satisfactory anD economical method than was previously possible when this work was being Done at night, but the process is still somewhat slow, anD early in the year the Engineer recommenDeD to the BoarD the con struction of a small grit or settling chamber near the PeaboDy Venturi Meter in which the heavier soliDs coulD be settleD out anD easily removed, which woulD greatly reDuce the cleaning work throughout the sewer. Weekly reaDings cf the sewage level in this sewer show it to be flowing a little more than half full, except in times of heavy rain. Again this year it was necessary on several occasions to open relief gates anD Discharge sewage into the North River. Caustic lime still enters this sewer from the manufac turing plants in PeaboDy anD Salem to such an extent that the sewage is heavily caustic at the Salem Pumping Station, anD the precipitation of this substance upon the inside of the sewer anD outfall is still increasing. Enforcement of the regulations of the BoarD now in effect unDer chapter 384 of the acts of 1935 will prevent this substance from reaching the sewers anD eliminate the troublesome anD 4 costly Damage that it is continually causing. A reDuction in the large amounts of suspenDeD solids which are now DischargeD to the sewer from the various manufacturing plants will also reDuce the cost of maintaining this sewer in proper conDition. Rainfall The total rainfall for the year, which is measureD Daily by the District’s force in a gauge maintaineD by the State Department of Public Health near the Salem Pumping Station, was 43.54 inches. This is about a normal year, the greatest monthly precipitation of 5.63 occurring in April anD greatest daily of 2.73 occurring on November 28. The following table shows the rainfall for the year by months: January, 4.30 May 2.86 September 4.38 February 1.04 June 3.27 October 4.23 March 3.31 July 0.89 November 4.78 April 5.63 August 4.83 December 4.02 Grease and Grit Chamber Grease has been removed from the sewer at the Grease anD Grit Chamber about once a week throughout the year, anD the grit anD heavy solids that collect in the grit chan nels have been removeD whenever the channels became filleD. The amount of grease removeD is estimateD as 12,870 cubic feet, or about 380 tons, which has been DisposeD of by bury ing on farmlanDs; while the amount of grit anD solids re moveD is estimateD as 1,750 cubic yarDs, anD this material has been disposed of by spreaDing on farm lanDs where it is ploughed into the soil. Two large watertight steel tanks were made for hauling this sluDge, to prevent any leakage along the streets. There have been no complaints of grease on the beaches arounD Salem Harbor, anD inspections of the beaches, as well as arounD the outlet in the Harbor, show that practi cally no grease is escaping to the pumping station to be DischargeD into the Harbor. The analyses by the State Department of Public Health of 24 composite samples taken twice a month from a tap at the Venturi meter in the Salem Pumping Station show an average fat content of 39 p.p.m. Force Mains The 30" force main from the Beverly Pumping Station to Juniper Cove Junction remains clean, while in the 48" main from the Salem Pumping Station to the 54" main at Juniper Point, anD the entire length of the 54" main, the coating of lime scale is still increasing. Early in the year the District Engineer reporteD on the feasibility of cleaning 5 these mains. Proposals for Doing the work were receiveD from two companies, anD these are being considereD by the BoarD. The Desirability of unDertaking this work is apparent from the measurements of friction loss through these mains, which show this loss to be about three times that of new clean pipe, anD still increasing. Again this year the automatic vacuum pump on the 48" force main has functioneD well, keeping the main free of entrappeD air, resulting in a very appreciable saving in power at the Beverly Pumping Station, where part of the sewage can be siphoneD, anD keeping the heaD against which the pumps at the Salem Pumping Station work, as low as possible. During the summer months, in perioDs of low liow anD at low tiDe, vacuum reaDings at this point on the force main as high as 18 inches of mercury have been observed. Pumping Stations DANVERS PUMPING STATION At the Danvers Pumping Station, the small unit still hanDles the flow easily, anD all of the eQuipment is in gooD orDer, no difficulties having been encountereD except for some variation in voltage on the power line, anD the local power company is co-operating in the remeDy of this con Dition. A new concrete coal bin was constructeD in the grounD outside of the station to replace the wooden one which occupied usable space inside the builDing anD which was of inaDeQuate capacity. The grounDs anD the station have been well kept, so that the entire plant presents a suitable appearance. BEVERLY PUMPING STATION The Beverly Pumping Station has again continueD to give excellent service throughout the year. All of the eQuipment is in first class conDition anD no repairs were reQuireD. A little less than one million gallons of sewage per Day was siphoneD anD the rest of the flow was easily hanDleD by the pumps, the small unit being used mostly in the summer months, anD the large unit During perioDs of heavy flow. The general appearance of this plant has also been maintaineD in suitable conDition. SALEM PUMPING STATION No changes have been maDe in the operation of this pumping plant During the year. All of the eQuipment is olD, anD the pumps are of obsolete Design anD inaDeQuate capacity, resulting in poor economy.