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INTERWEST—EVERETT CONTRACTOR'S YARD SITE IMPROVEMENTS Sitts & Hill Engineers, Inc. <br /> OPERATION AND MAINTENANCE MANUAL Job Number 18,831 <br /> 8. Remove accumulated sediment from the floor o=the Material Disposal <br /> vault and from the forebay This can most effectively be <br /> accomplished by use of a vacuum truck. he accumulated sediment found in stormwater treatment <br /> and conveyance systems must be handled and disposed of in <br /> 9. Once the sediments are removed,assess the condition of the accordance with regulatory protocols.It is possible for sediments <br /> on <br /> vault and the condition of the connectors to contain measurable concentrations of heavy metals and <br /> 10.Using the vacuum truck boom,crane,or tripod,lower and organic chemicals(such as pesticides and petroleum products). <br /> install the new cartridges.Once again,take care not to Areas with the greatest potential for high pollutant loading <br /> damage connections. include industrial areas and heavily traveled roads. <br /> II 1 Close and fasten the door, Sediments and water must be disposed o`in accordance with12 Remove safety equipment. all applicable waste disposal regulations.When scheduling <br /> 13.Finally,dispose of the accumulated materials in accordance maintenance,consideration must be made for the disposal of <br /> with applicable regulations.Make arrangements to return the solid and liquid wastes.This typically requires coordination with <br /> used empty cartridges to Contech_r.gineered Solutions. a local landfill for solid waste disposal.For liquid waste disposal <br /> a number of options are available including a municipal vacuum <br /> truck decant facility,local waste water treatment plant or on-site <br /> treatment and discharge. <br /> ' Related Maintenance Activities - <br /> Performed on an as-needed basis .;. <br /> StormFilter units are otter:just one of many structures in a more r; <br /> comprehensive stormwater drainage and treatment system. <br /> In order for maintenance of the 5tormFilter to be successful,it <br /> ' <br /> is imperative that all other components be properly maintained. 11 The maintenancejrepair of upstream facilities should be carried I <br /> out prior to StorrrF her maintenance activities. <br /> In add tion to considering upstream facilities,it is also important <br /> Ito correct any problems identified in the drainage area.Drainage <br /> area concerns may include:erosion problems,heavy oil loading. <br /> and discharges of inappropriate materials. <br /> i:nrriiue_ <br /> • <br /> 1110 <br /> • <br /> 1 <br /> ,r! <br /> r <br /> • <br /> 1 <br /> • <br /> 1 <br /> SITTS& HILL ENGINEERS, INC. 23 <br /> TACOMA, WASHINGTON <br />