(b) Construction of Bulkhead and filling of Chelsea Street Flats,

(2) South Metropolitan Sewerage System, Construction,

(a) Extension of the High-level Sewer,

(b) Quincy Pumping Station,

(3) Acquisition of Lands and Settlements for Lands acquired,

(4) North Metropolitan System, Maintenance,

(5) South Metropolitan System, Maintenance,

VII. Sewerage Works, Financial Statement,

(1) Metropolitan Sewerage Loans, Receipts and Payments,

(a) North Metropolitan System,

(b) South Metropolitan System,

(2) Issues of Metropolitan Sewerage Loan Bonds,

(3) Metropolitan Sewerage Loans Sinking Fund,

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X. Legislative Acts of the Year 1907,

XI. Recommendations for Additional Water and Sewerage Loans,

XII. Sewerage and Water Assessments,

Extension of the High-level Sewer through West Roxbury, Brookline and

Brighton,

152

Appendix No. 1.-Contracts relating to the Metropolitan Water Works made and pending

during the Year 1907,

Appendix No. 2.-Tables relating to the Maintenance of the Metropolitan Water Works,

Table No. 1.-Monthly Rainfall in Inches at Various Places on the Metropolitan Water

Works in 1907,

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180

183

183

Table No. 2.- Rainfall in Inches at Jefferson, Mass., in 1907,

Table No. 3.- Rainfall in Inches at Framingham, Mass., in 1907,

184

185

Table No. 4.- Rainfall in Inches at Chestnut Hill Reservoir in 1907, .

186

Table No.

Table No. 5.- Rainfall.in Inches on the Wachusett Watershed, 1897 to 1907,

6.- Rainfall in Inches on the Sudbury Watershed, 1875 to 1907,

188

189

Table No. 8.-Yield of the Sudbury Watershed in Gallons per Day per Square Mile from

1875 to 1907,

Table No. 9.- Wachusett System. -Statistics of Flow of Water, Storage and Rainfall

in 1907,

Table No. 10.- Sudbury System.

Table No. 12.- Elevations of Water Surfaces of Reservoirs above Boston City Base at
the Beginning of Each Month,

Table No. 13.-Sources from which and Periods during which Water has been drawn
for the Supply of the Metropolitan Water District,

7.-Yield of the Wachusett Watershed in Gallons per Day per Square Mile

from 1897 to 1907,

Statistics of Flow of Water, Storage and Rainfall in

Statistics of Flow of Water, Storage and Rainfall

Table No. 14.- Average Daily Quantity of Water flowing through Aqueducts in 1907, by

Months,

Statement of Operations of Engines Nos. 1 and 2 at Chestnut Hill High-

service Pumping Station for the Year 1907,

Table No. 16.-Statement of Operations of Engine No. 3 at Chestnut Hill High-service

Pumping Station for the Year 1907,

Table No. 17.-Statement of Operations of Engine No. 4 at Chestnut Hill High-service

Pumping Station for the Year 1907,

Table No. 18.-Statement of Operations of Engines Nos. 5, 6 and 7 at Chestnut Hill Low-

Statement of Operations of Engines Nos. 8 and 9 at Spot Pond Pumping

Station for the Year 1907,

Table No. 20.- (Meter Basis) Average Daily Consumption of Water in Cities and Towns

supplied Wholly or in Part by the Metropolitan Water Works,

Table No. 21.- (Meter Basis) Average Daily Consumption of Water'from the Low-service

System,

Table No. 22.- (Meter Basis) Average Daily Consumption of Water from the High-

service and Extra High-service Systems,

204

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Table No. 23. Average Daily Consumption of Water in Cities and Towns supplied from

Metropolitan Works, as measured by Venturi Meters in 1907,

(Pump Basis) Consumption of Water in the Metropolitan Water District,

as constituted in the Year 1907, the Town of Swampscott and a Small

Section of the Town of Saugus, from 1893 to 1907,

208

211

Table No. 25.- Chemical Examinations of Water from the Wachusett Reservoir, Clinton,

Table No. 26.- Chemical Examinations of Water from the Sudbury Reservoir,

Table No. 27.- Chemical Examinations of Water from Spot Pond, Stoneham,

Table No. 28.- Chemical Examinations of Water from Lake Cochituate,

Table No. 29.-Chemical Examinations of Water from a Tap at the State House, Boston,

Table No. 30.- Averages of Examinations of Water from Various Parts of the Metro-

politan Water Works in 1907,

Table No. 31.-Chemical Examinations of Water from a Faucet in Boston from 1892 to

1907,

Table No. 32.-Colors of Water from Various Parts of the Metropolitan Water Works in

1907,

Table No. 33. - Temperatures of Water from Various Parts of the Metropolitan Water

Works in 1907,

Table No. 34. - Temperatures of the Air at Three Stations on the Metropolitan Water

Works in 1907,

222

Appendix No. 2- Concluded.

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223

Table No. 35.-Table showing Length of Main Lines of Water Pipes and Connections

owned and operated by Metropolitan Water and Sewerage Board, and

Number of Valves set in Same, Dec. 31, 1907,

Table No. 36.-Statement of Cast-iron Hydrant, Blow-off and Drain Pipes owned and

operated by Metropolitan Water and Sewerage Board, Dec. 31, 1907,

Table No. 37.-Length of Water Pipes, Four Inches in Diameter and Larger, in the

Several Cities and Towns supplied by the Metropolitan Water Works,

Table No. 38. - Number of Service Pipes, Meters and Fire Hydrants in the Several Cities

and Towns supplied by the Metropolitan Water Works,.

Table No. 39.- Average Maximum and Minimum Monthly Heights, in Feet, above Bos-

ton City Base, to which Water rose, at Different Stations on the Metro-

politan Water Works,

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226

Appendix No. 3.- Water Works Statistics for the Year 1907,

Appendix No. 4.- Contracts relating to the Metropolitan Sewerage Works, made and pend-

ing during the Year 1907,

237

Appendix No. 5.- Financial Statement presented to the General Court on January 15, 1908,

Appendix No. 6.- Legislation of the Year 1907 affecting the Metropolitan Water and Sewer-

age Board,

241

LIST OF ILLUSTRATIONS.

Wachusett Dam with Full Reservoir,

Frontispiece.

Wachusett Reservoir - View from Northwesterly End of the Wachusett Dam,

Arlington Pumping Station - Metropolitan Water Works, .

Improvement of Snake Brook near Lake Cochituate,

Sewer Construction in Trench on Columbia Street, Brookline - High-level Sewer Extension,
Diagram showing Average Rate of Consumption of Water in the Metropolitan District in
1907 during the Entire Day and between the Hours of 1 and 4 at Night,

42-inch Water Pipe in Chelsea pitted by Electrolysis,

Steel Forms for placing Concrete Masonry Lining in Tunnel-High-level Sewer Extension,

Filter-beds in Sterling on Wachusett Watershed, .

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80

96

Diagram showing Average Rate of Consumption in Metropolitan Water District and Aver-
age Temperature of Air at Chestnut Hill Reservoir for Each Week during 1907,
Method of supporting Roof Plates in Tunnel Heading - Construction by Compressed Air on
High-level Sewer Extension,

Air Lock at Tunnel Heading - Construction by Compressed Air on High-level Sewer Ex-
tension,

154

Trench Machine in Operation on Cypress Street, Brookline - High-level Sewer Extension,

156