. Annual report of the Metropolitan Water and Sewerage Board . ammonia, sewage, Free ammonia, effluent, .5792 .6862 • .89 .99 Per cent, removed, . . 73 83 84 73 67 81 75 Nitrogen as nitrates, effluent, ,. .7300 .9298 .9815 .4168 .2129 .5963 .4046 The cost of maintaining the filter-beds, exclusive of the cost ofremoving the dirty sand or gravel from the 19 beds, has been asfollows : — Labor $2,198 16 Repairs and supplies, 42 15 Total, ....Cost per million gallons filtered, !,240 318 29 14-J MKTKOPOLITAX WATER [Pub. Doc Appended to thi
. Annual report of the Metropolitan Water and Sewerage Board . ammonia, sewage, Free ammonia, effluent, .5792 .6862 • .89 .99 Per cent, removed, . . 73 83 84 73 67 81 75 Nitrogen as nitrates, effluent, ,. .7300 .9298 .9815 .4168 .2129 .5963 .4046 The cost of maintaining the filter-beds, exclusive of the cost ofremoving the dirty sand or gravel from the 19 beds, has been asfollows : — Labor $2,198 16 Repairs and supplies, 42 15 Total, ....Cost per million gallons filtered, !,240 318 29 14-J MKTKOPOLITAX WATER [Pub. Doc Appended to this report are tables of contracts giving the amountof work dour and other Information, a statement of the cement tests,a long series o\ tables relating to the maintenance of the Metropol-itan Water Works, tables showing the Length of main pipes andnumber of ser^ ice pipes, meters and lire hydrants in the MetropolitanWater District, and a summary of statistics for 1904. Respectfully submitted. Boston, January 1, 1905. FREDERIC 1\ STKARNS, Chief r i * / /
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