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� � � � 304.2 Continued. 300-17 NOTE: AFTER THE TEST, TiiE HXDRANT SHALIG Br, SHUT OFF AND A CAP LQQSENED TO ALLOW HYDRAMT DRAINAGE. TIGHTEN CAP AFTER DRAINAGE. A hook-on type D.C. ammeter plaeed on �one of the eahles leading ta the hydrant is�a convenient method of ineasuring current. In usin,g arc welding machines, the ourrent cantrol 9hould be set at minimum befor� atarting. After starting the machine, advanae the control until the eurrent indicated on the amzneter is at the desired test value. CAUTION: In case of open circuits at joints or conneetions, the � voltage aervss the defective joint or connection will be in the �rder of' 80-100 volts. � 30�4,3 � � � �1 � � � � � � � O Disinfection A11 water distribution system or ex�ension to existing system, or any valved section oi such eacten3ion, �r replacement, shall be disinfecied prior to placing same in service. Such chlorination shall con�ist of a d�sage of chlorine equivalsnt to 50 parts per millian of ehlorine. This may be accomplished by using a commerci�l type chlorinator for feeding a chlorine solution or by plaeing dry Calciuffi H�� as "HTH", "PERCHLORON", or "MAXOCHLOR ai the ra�e of on�ochlorine such material containin n pound (1,�) of � 70� aeailable chlorine per eaeh 16$0 gallons of water in the line. A predetermined dose shall be shaken into the suetion wall, the staxid- P1P� ox' eleva�ed tank, or into ths pipe at the fir�t the existing water pipe, an� the dosage shall be repeated�attfrequent� predetermine� intervals, preferably at each pipe joint as the laying progresses, or as may be dir�eted by the Engineer, plpe Wh�n treated with dry calcium hypoehlori.te or with dry chlorin�ted lime, the newly laid pipe shall be filled very slowly to avoid washing the powder to �he extremity of the pipe line. Tre��ed water shall be retained in the non--��?ore-forming bacteria. This periodlshallnbeeatugeast three�hours and �referably longer as �nay be directed, After chlArine treated water ha� been �^etained for the required time, the chlorine residual at pipe extremitiE:s and at other ��epresentative points shall be at least five parts Per million. In the pr�c�ss of chl.orinating newly laid Water pipe, all valves or othex� appurtenances shall be operated wlhile th� pipe line is filled with the chlorinating ag ent. Followin� chlorination, all treated wa�er shall be thoroughly flushed from the n�wly Iaid pipe at its extremities until the replacement water throughout its len�tti, shall, upon test, both ehemically and bacteriologically, be pro�t�en equal to the water quality served the