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�:.. <br /> ��x ... <br /> t"H2�C!A <br /> HxH <br /> � Hp�� <br /> � y� DESIGN � CONS1RIICfION <br /> Hx <br /> �H l7 4.�11 OIL/G7ATIIt SEPARATION AND GRIT RFJtOVAL � <br /> �O <br /> �� For stormwater treatment the vault sliall provide a minimum of a 15 <br /> � y� minute retention time at the rate of the vault inlet capacity. <br /> H y For stormwater treatment the vault inlet capacity shall be determined <br /> �Uj by use of the rational foxmula, Q – cia.� The intensity for use in _� <br /> n d y che rational formula shall be 0.5 in/hr. '.:, <br /> ���q � pill containment vaults�shall 'p[ovide�,a �minimum "live; capacitX of <br /> H O Cn 2500 ga11�Rs. �. \ � �, � <br /> Bypass piping shall not be allowed for spill containment vaults. <br /> Coalescing plates may be required for sites with a high risk of large <br /> � volume spills or discharges. <br /> For stoxmwater treatmenc a bypass piping system shall be used to <br /> diveit excess flow� around the vault when the inflow rate exceeds the <br /> capacity of the vault inlet. � <br /> For spill containmant, vaults shall be equipped with ar, isolation <br /> valve. <br /> Spill containment vaults shall discharge into the sanitary sewer - <br /> � '�1 system. . <br /> ' f 4.11.1 HAINTt?IANCE <br /> �1 <br />� '�' The oil/water separator shall be checked frequently by the property <br /> owner or manager and cleaned whenever oil accumulations exceed 0.5 <br />� 1 ' ��� ��y'Y inches anywhere in the separator. <br /> � ��5 � Th> separator shall always be cleaned in early October to remove <br /> p 1 material that has accumulated during the dry season and again after <br />� �� 'r G+� the first significant rainfall of the fall/winter (more than 0.5 inch <br /> '� � � in 24 hours. At a minimum, the sepaxator sha7.1 be cleaned once again <br /> in the spring. <br /> _� ��S <br /> � Oil/water separators for high risk sites, or those dischar¢:ng to <br />� '� � �1� sensitive surface waters, may require more frequent maintenanoe. <br /> ' 4,12 OPEN CHANPIELS <br /> I' �I points of discharge from culverts or storm sewers into any open <br />, �1 channel sha11 be protected from erosion by means of rip rap, splash <br /> boaeds, stilling wells, and/or adequate vegetative cover. <br /> —'� <br /> � _. <br /> IV-14 <br /> ---'�-----'––. .__ <br />