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3„ TRENCH VVIDTH <br />3 <br />CONCRETE ENCASEMENT 560-C-3250 #4 @ 12" O.C. <br />#4 CONT (4) <br />FOR USE WHEN PIPE COVER TO SURFACE IS LESS THAN 36" <br />CASE 1 <br />NOTES: <br />1. ALL SEWER ENCASEMENT REQUIRES APPROVAL FROM THE WATER RESOURCES DIVISION. <br />NEW SEWER CROSSING PIPE WALL <br />I (DIAMETER OF NEW SEWER = "D") <br />If 18" OR <br />BACKFILL WITH 6" (MIN.) LESS <br />SAND, S.E. 30 (MIN.) � <br />CONCRETE BLANKET °_' I .. <br />450-C-2000 • > ° + <br />�e <br />e,' ' <br />UNDISTURBED EARTH (TYP.) � <br />EXISTING PIPE <br />6" (Mil <br />(TYP <br />CONCRETE BLANKET <br />I <br />Y�Z <br />(SEE NOTE 2) <br />2 <br />(TYP.) <br />NOTES: (FOR EXISTING PIPES CROSSED OVER BY A NEW PIPE) <br />1. CONCRETE BLANKET IS REQUIRED WHEN THE CLEARANCE BETWEEN THE TOP OF THE EXISTING PIPE AND THE <br />BOTTOM OF THE CROSSING PIPE IS LESS THAN 18". <br />2. X = 4-INCHES, MINIMUM, TO PROVIDE BEDDING MATERIAL FOR THE CROSSING PIPE. WHEN X IS LESS THAN <br />MINIMUM, THE ENTIRE TOP SURFACE OF THE BLANKET SHALL BE RAISED TO MAKE CONTACT WITH THE LOWER <br />90° OF THE CROSSING PIPE. <br />3. THE BLANKET SHALL EXTEND LONGITUDINALLY TO THE FIRST JOINT BEYOND THE TRENCH EXCAVATION AT <br />EACH END OF THE BLANKET, EXCEPT THAT THE BLANKET NEED NOT BE EXTENDED MORE THAN 4' BEYOND <br />THE TRENCH. <br />CASE 2 <br />DATE: (( <br />i y '�7r I o CITY OF SANTA ANA o <br />DATE �( REVISION <br />11/05/12 J.A. ADDED 1203A <br />PUBLIC WORKS AGENCY <br />SEWER ENCASEMENT/ <br />CONCRETE BLANKET <br />STD. PLAN <br />NUMBER <br />1203A <br />