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� 6.1.D. - Page 143 <br /> �XFifB11''�C" � . <br /> y ` <br /> �ww,«�tp�1�"f raY���Q� PlCC8SIC017dC1e1,1Cdular5lD�MW.lI[+l�fandgalliERnt5yS1G!!IS . 1-877'967-VV�! <br /> Y <br /> B. Hov�to Cleact#h�StormTrap� <br /> 'fhe syslen�sl�ould!�e eompletely cleaned back fo �UO%of tha or€ginally cEesigr�ed s��rage volume . <br /> � ' :�whenever ti�e above sedimenf levels haye be�n reached. Be sure#a rrvail at(east 3 days after a � � � <br /> •stormwater event to be sure that the sys#em"ss complete[y drained (�f ft is a Dry oefention System), and a!E <br /> af the sediments have settEed tp the battarn o�the system(if i#is a Wet Detention Systern). <br /> �o�nt en€er!he �Jndergrout�c4 Stormwater Defention Systern unl�ss you ar� pra�erly trained, equipped, <br /> ' and qualified Ea en#er a confiner!space as idenfified by focal oec€�pa�ianai safety and healfh regulaEions. <br /> '�he rnaleriaE that is remnveci may be consid�red!ow leval haiardnus yvas#e and must be'dispased af in <br /> accardar�ce rvith any and afl locaE and r�ationaf regulatitrns. � ' . � <br /> � Tl�ere are many maintenance cntrEpan�es that a�e in busir�ess to he3p you c[ear�yaur underground <br /> • sto�'mWafer detention ar�d water quafity units, Please call your StnrmTra}�C�7 repres�ntative for referrals in <br /> • your�rea. . <br /> A. Dry [3eientiorr Sysfer�Cleaning , � � ' . � <br /> . Maint�r�ance is typically perforrned using a vacu€�m truak. 5edirt�ertt should bE f€ushed fnwards a <br /> � � vacuum hose for thorough remQVa1. �ar a Dry Ret�ntfon Systern,�-erna�e the manhvle cover af <br /> � the Eop of 3he systettt and Eower a vacuWrn hose into flne of th�rows p�the Starrn�'rap�systern. <br /> bpen up fhe manhol�ai the opposlte end of the 5#ormTrap��nd us�sewer Jetlir�g equi�rr►ent ta <br /> foroe waEer�n the sartte row frpm one end af the StorrErTrap�row to the opposife sid�. The rd4vs • <br /> . oF ti�e S#ormTra�C�are completely open in one contiguaus channef frorn one•end to!he ather for <br /> , • � easy cleahing, . ' <br /> � Place the vacuum hose ar�d the sevver jetfing equip�eht fi the r�eXt raw and repeat fhe pracess_ <br /> until all af the rows have been c[eaned. � � <br /> � When finished, replace all cavers tf�a#were re�rtoved ancl dlspase af i�te callecfecl rnafer+ai <br /> prnperly. � • � <br /> - B.Wet RetEntion Systerr�Cieaning � <br /> If the system was c�esigned#a maintain a p�rmanent panf nf water,floafak�les and any oif sho�ld <br /> be re€�aved ir�a se�arat�procedure prior io the rernoval af all s�diment. <br /> Tf�e floatable iraski is rernoved first hy using a bucket strainer to eapture and rernove ar�y floa#ing <br /> debris. . <br /> � '�he flaatabEe oifs are then removed of�the top of fhe water by using the vaeuum#ruck tn suck off <br /> any floatab[e fluids ancf liq�ids. - � . <br /> The next step Is to�as�the vacuun�truck#o genfly rerrrove the clarified water above t�ie sedimen#, <br /> layer. <br /> 7he final step�is ta ekean the sedirnent for each row as d�scril�ed above in the paragraph"A. Dry <br /> Detenlian System Clear€ing". For smaller systems,fhe vaeuum trucfc can remove all of the <br /> sed�ment in#he basin wiihout using the sewer jetking equipment because af the sma3ler,space, <br /> J��l�(*���P GEr rNf ARFCAST A�VANT�GF.r D�U$�'�`�� <br /> w�un�tit�+mulr`:w�1��rs>w , ARY�w�Y�sf-�suiqknw <br /> �escriptiioxi: San Mateo,CA bocumezzt �- Xear.DaclD 20S1.ZZ5421 P�ge: .�7 a� 29 � <br />