Laserfiche WebLink
h�uland Construction �•8nd �an <br />E�rerett Federal SavinB <br />Febraary 4 � 1986 <br />page Z <br />Discussion_: <br />I have checke�l the grade of the build!ng drain (under the ba?ement floor) and t e <br />building seuer (�tside of the buildir�� to City 1%nhole 5) and rind that it has a <br />the Uniform Plumbin6 Code. (�e att9�and <br />alope of 1/4-ineh per foot, as required by <br />inal drawSnB <br />calculation.) 'fhis is based on invert elevations shoxn on the orig <br />thr City records. y�wer <br />a bloekage or <br />With the City sever ieavin h�nUole 5(8-inch) and the E.F.S.�L. build B <br />e of the City seKer or bui]ding ser+er uill not allow the <br />entarin hhnhole 5 both at the same inver,t elevation (218.O�lor+est fixture or <br />partial temporery blockag <br />building drain to fUnetion and thereby overf loW throuBh �e <br />any blockage of the City <br />fixtures. 'this was evidently the case before the baek��r valve was installe . <br />µ���, with the backwater valve in its present position, <br />fixtures, especially from those above <br />sexer causing a rise oY sewage in Necil�ole 5 will not backf'lor+ beyond the backrs r <br />valve. ibaeverr contirn�ed use of the building <br />the basement level, r+ill produce an overflor+ condition at the loWest fixtures if <br />Lhat blockage occurs. <br />It is essumed thr backxatRr valve is an app��� tYpe peC �etion 2�9 0£ the Uniform <br />Plumbing Coder and has been properly malntainPd. <br />itecommen� g' ser+er <br />dii drain and SuildSnB <br />1 <br />2. <br />3• <br />Clean out en��ir��oler5°or and below-Srade buil �B <br />all the way <br />Verify building sewer entry into h}anhole 5 Ss at invert elevation 218.00 (sam� <br />as 8-ixh Clty sever leaving invert)• <br />Study the possibility of re-routing the draina6e PiPing �r°i�F any fixtures or <br />gystems above the basement level to bypass the existing backwater valve• 'me <br />Unlform Plumbing Code, Section 409, states: <br />serving fixtures which have flood level rims la:aLed b�lsuehhe <br />�prPinage piping �gtalling an <br />elevation of theshall besprotectedhfrom backflowtof seaage bY eP s� � iTa <br />drainage piping .er valve." <br />approved type backw'a� <br />Th is ca:ls for protection of the basement £ixtures, which exists if the <br />backrrater valve is an approved type. <br />'ihe Cade further states: <br />"Fixtures above such elevation ehall not discharge through the back�ster valve." <br />1'his means all oC the maln flocr fixtures shall n_t discharBe through the <br />backuater valve. � the <br />The existing drawinB9 shoM all of the first floor zixtures connecting <br />myin building drain in Which the backflou valve is connected. <br />� <br />z <br />0 <br />-a <br />� <br />m <br />.. .. <br />--� T <br />� -�i <br />N S <br />0 <br />co <br />mo <br />--� c <br />o� <br />_ -�-� <br />m <br />oz <br />c <br />.r. � <br />�� <br />< <br />T <br />O D <br />3 <br />� Ri <br />m� <br />� <br />o� <br />c �n <br />mN <br />�� <br />m <br />a <br />� <br />x <br />n <br />z <br />� <br />� <br />� <br />z <br />c <br />-� <br />n <br />