1111 CRAFTSMAN WAY 2016-01-01 MF Import

( i � STORM AND SURFACE WATER ( i 4-2.3(3) S1'RUCTUR�S � I. Ivlanholes, catch basins, and inlets shall be constructed of pre-cast units in accurdance with the , following Standard Ylans: Item Section Manholes 605A-C Catch Basins 402 through 404 Inlets 401 ' Steps and I.r�dder 606, 606A , Frames and Grates 405 through 409 � 2. Catch basin (or manhole) diameter shafl be deterntined by pipe size and orientation at the unction � structure. A plan vie�v of the junction structure, drawn to scale, will be required when more t�an four pipes enter the strucwre on the same plane, or if angles of approach and clearance bet�veen pipes is of ; concem. The plan vie�v (and sections if necessary) must insure a minimum solid conerete wall distance betwecn pipe openings of 3 mches for 48 inch and 54 inch catchbasins and 12 inches for 72 inch and 96 inc:i catch basins. 3. Catch basin evaluation of structural integrity for H-20 loading may be required for multinle junction � catch basins and other structures. � 4. Catch basins shall be provided within 50 feet of the entrance to a pipe system ro provide far silt and � debris removal. l 5. HDPE pipe systems lon�er than 100 feet must be secured at the u�stream end and the do�vnstream end � must be placed m a 4 Poot section of the next lar�er pipe size. This sliding sleeve connection accounts for the high thermal expansion/contraction coefficient of this pipe material. I 6. The maximum slopc of thc ground surface for a radius of 5 feet around a catch basin a ate shall be 3:1. i � 7. A Type II catch basin or a manhole shall Ue required �vhen thc depth to the flow-line exceeds 55 feet, regardless of the pipe size. 8. Alf Type II catch Uasins and all manholes shall be equipped with ladders per Standard Plan No. 606 or 606A. 9. A Type II catch basin shall be installed as the last collector in the public right-of-�vay prior ro discharge to the combined sanitary se�ver. 10. Concrete inlets shall not be used where the discharge �ocs directly into thc main storm drain system. ( � 4-2.3(a) PIPE ALIGN�I�NT/CO� � �CTIONS/COV�R � 1. Pipes must Ue laid true to linc and grade with no curves, bends, or de(lcc:ions in any direction, except for HDP� and ductile iron with flanged restrained mechanical joint bends (not gmater than 30 degrees) on steep slopes. 2. A catch basin or manholc ��ill bc required at �II changes in srorm drain diameter and changes in �rade or ali�mmcnt. � srnm�niai�s a-� ( Rc.�.a102 (