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t � 240570 24057�1 `� � 24057.2 ', � stall�d in a�cordanr_? with the manufacturer's recommendations> SERVICE CONNECTIONS: Wye Branches: If the t�p of the main sewer is eight feet or less belc�w street grade, harzontal wye branch sha11 be placed at the locations directed by the Engineere The wye b.raz�ch shall be placed so that the connection has << slight vertical angle wi*h the main seurer, Vitrified plugs sha].1 be providect for the openings. Double Wye Branches: If the to�, of the main sewer is eig;ht feet or l�ss below the street grade and tiao servicE:s must be p.rovided at the: same locatic�n double wye branches stiall be placed as direr_�ed by the Engineer. Vitrifisd ��lugs shal.l be provide3 for the �penin�s. 24057�3 Tee Bran�hes: If the t�p o£ the main sewer is deeper than sight feet below � street grade, service conne�tior�s shall be provided by means of a tee bran�h, set vertical to rhe main sewer� � � 24057.4 Risers: Vitrified c�.dy pipe sh�lll be used as ris;ers to extens� se�vice connections to a point within eight feet of the street gradea Wherever tees are used, four cubic feet of cancrete, consisting of one part Partland cement to six parts of clean pitrun �ravel shall be placed as a collar around the main horizontal sewer and shall extend to a goinc si.x inches ab�ve the be1T� connection� If more than one joint is required, a wood support 2" x 4" and of length eqval to the riser pipes shall be provide�. as a ver�itial supporc� The riser pipe shall be wired at not exceeding pipe length distance, �o the support with suitable wire, Size No. 12. Vitrified plugs sh3].1 be provided for the openings. 24057s5 Records and Location of Sexvice Connectioas: It shall be the duty of the Contractor to k�ep an accura�e record of servi.ce connect:ions, as to location, deptk� to top of r3ser, type of connectian provided, etr..s, Location sha11 ba made in respect to nearest manhole cen*er, down-grade frocn the service. This record shall be turned over to the Engine?r at the end of �ach week� 24057.6 Siz.es of Service Connections: Size of spurs to tee and wye branches shall be as � stated in the "Special Provisions" or "Propos�l"� � 24058� MANHOLES: 24058,1 Excavati�ns: Excavation sha11 be to a depth and size to prc�vide for construction of the manhole as shown in det�i�_ on the plans, � 24058,2 Concr.ete Base: Concrere base for ma nhole constructzon shall be of size and depth as shcwn on che plans. Concr�te used for this purpose shall consist of one part � Portland cement, tw: parts of clean �harp sand, and four parts of graded coarse aggregate. Material used f-ar th.is pu.rpose sha11 be subject to the approval of the Engineer. Bas� shall be poured on undisturbed earth. � � �'' J 24058,3 Wa11s: riatArial �^ be use:� in rhe walls cf manholes shall be specified in ths "Special Proviei:ns". ;111 external surfac�s of brick and concrete block manholes shall be "plas�e.red" wi�h a 1�2 inch r�3� nf P�rtland cement mortar, Mortar shall conrain one paYt o.t �ement c.� ;.hree parts of suitable plaster sand. Lime or mortar mi�: shall be u_ed i_n a�»��.nr_ ne�essary to malce a suitaUle mixture for plastering purp��ses, bur not t� ex.e�d 15% by vo�ume �f cement. riortar used for laying brick ar ��ncrete bl��k shal� �nsist �f �ne part Portland cement t� cwo parts of sand to which lime or morta: mi� :nay be added not �o exceed fifteen per cez�t (15%) by volume of r_ement> 24000 - 9 :�