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/ / SE CTIO N B— E X T E N S IO N OF M A IN S ?fhe follow in g rules are applicable only w ithin the C ity and C ounty o f San F rancisco E xtension o f mains w ill be made b y the D epart­m ent on ly on public streets and avenues w here pres­sure conditions perm it and where grades o f such streets and avenues have been established b y law and brought to grade; provided, that the Departm ent has a sufficient w ater supply developed to take on new or additional services w ithout detrim ent to those already served, and that the follow in g provisions governing such installations shall apply: Rule 1. Size and location o f pipes. The D epartm ent \ shall sp ecify sizes, character and location o f all pipes j and appurtenances fo r new services and shall per- I form the w ork o f construction. f It is understood that where extensions _ are to be made from feeder lines already installed in the dis­trict the maximum deposit required from the con ­sumer to cover the cost Of the extension w ill be based on the cost o f four-inch cast iron pipe. In subdivisions or in districts where a system o f feeder lines and laterals must be installed to furnish the service desired, the applicant or applicants fo r such service w ill be required to deposit the estim ated cost o f the com plete system. Rule 2. W hen cost does n ot exceed fou r tim es the annual revenue. The D epartm ent w ill at its ow n ex­pense extend its mains a distance o f 150 feet, exclu­sive o f street crossings, to serve a new consumer, or i f the required extension is in excess o f 150 feet exclusive o f street crossings, and the estim ated cost fo r such extension is not in excess o f fou r tim es the estim ated annual revenue therefrom the Departm ent w ill likew ise m ake such installation at its ow n ex­pense. The D epartm ent reserves the righ t to refuse to m ake an y extension at its ow n expense i f not satisfied that such extension w ill be put to imme­diate and perm anent use. R ule 3. W hen cost exceeds fou r tim es the annual revenue. I f the estim ated cost o f such extension fo r new service is in excess o f fou r tim es the estim ated annual revenue therefrom the Departm ent w ill make the installation provided the applicant deposits w ith the Departm ent the estim ated am ount o f such cost in excess o f fou r tim es the estim ated im m ediate -an­nual revenue, adjustm ent o f any difference between the estim ated and actual cost to be made at the com ­pletion o f the installation. -The Departm ent w ill thereafter refund to the applicant, until the amount o f the deposit has been returned, fou r tim es the am ount o f revenue collected annually only from the ad d ition a in erm a n en t new consumers attached to this e x te n s io n s P rovid ed, however, that i f additional consumers, other than those contem plated in the original appli­cation, are connected to such extension, they shall be required, upon demand b y the original depositor, to pay to the Departm ent their pro rata o f the cost o f the extension, proportional refund to be made b y the Departm ent to the original depositor. J (a ) Interpretation o f the term “ estim ated annual revenue. ’ ’ The term ' ' estim ated im m ediate annual revenue ’ ’ is to apply to houses under construction b y the applicant at the time o f m aking the application and to houses already occupied and which w ill be connected to the new extension. R ule 4. Free installation o f necessary service. W hen the extension o f mains fo r new services are made under the above rules, the necessary active services and meters w ill be installed at the D epartm ent’s expense. (a ) D eposit to cover cost o f services n ot to be used im m ediately. I f request is made b y the applicant, additional services w ill be installed prior to the erec­tion o f houses provided the fu ll cost thereof is de­posited b y the applicant, and provided that such services w ill be put to use w ithin a reasonable period o f time. Such payments fo r services are not to be included in the above refunding schedule as they w ill on ly be refunded as the services are put into active and permanent use. Rule 5. Im provem ent o f service. The Departm ent m ay at its expense, as a part o f its routine opera- 18 19