ment, is more economical than project 5, fine screening and disinfection treatment, and it is therefore recommended as presenting the most satisfactory solution of the sewerage and sewage treatment problems of this district. Project 5 is recommended as an alternative in case future developments make it appear the more desirable.

COST OF PROJECT 4 FOR ULTIMATE DEVELOPMENT OF THE METROPOLITAN DISTRICT.

It should be noted that in the cost figures presented above the Conners Creek subproject, described on page 38, has been left entirely out of consideration. This has been done for the reason that, on account of the meagerness of fixed date available, it was impossible to make cost estimates for this project on as high a plane of accuracy as those for the rest of the district. Figures have been prepared, however, which, though approximate, merit consideration for the purpose of estimating the total cost of project 4 under conditions of ultimate development. These are presented in Tables 49 and 50, and again in Tables 51 and 52, in combination with figures already given in previous tables.