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HomeMy WebLinkAboutC407 - SWPP INFORMATIONGRAVITY BAG FILTERDescription:A gravity bag filter, also referred to as a dewatering bag, is a square or rectangular bag made ofnon-woven geotextile fabric that collects sand, silt, and fines.Appropriate Applications:Effective for the removal of sediments (gravel, sand, and silt). Some metals are removed with thesediment.Implementation:Water is pumped into one side of the bag and seeps through the bottom and sides of the bag.A secondary barrier, such as a rock filter bed and/or a straw bale barrier, is placed beneath andbeyond the edges of the bag to capture sediments that escape the bag.Maintenance:Inspection of the flow conditions, bag condition, bag capacity, and the secondary barrier isrequired.Replace the bag when it no longer filters sediment or passes water at a reasonable rate. The bagis disposed of offsite.ÔÔDE-WATERING AND PUMPING OPERATIONSDescription and PurposeDe-watering operations are practices that manage the discharge of pollutants when non-stormwater andaccumulated precipitation must be removed from a work location so that construction work may be accomplished.Suitable ApplicationsThese practices are implemented for discharges of non-storm water from construction sites. Non-stormwatersinclude, but are not limited to, groundwater, water from cofferdams, water diversions, and waters used duringconstruction activities that must be removed from a work area. Practices identified in this section are alsoappropriate for implementation when managing the removal of accumulated precipitation(stormwater) fromdepressed areas at a construction site.LimitationsSite conditions will dictate design and use of dewatering operations. The controls discussed in this bestmanagement practice (BMP) address sediment only. The controls detailed in this BMP only allow for minimalsettling time for sediment particles. Use only when site conditions restrict the use of the other control methods.Dewatering operations will require, and must comply with, applicable local permits.ImplementationDe-watering discharges must not cause erosion at the discharge point. A variety of methods can be used to treatwater during de-watering operations. This sheet provides options to achieve sediment removal. The size ofparticles present in the sediment and Permit or receiving water limitations on sediment are key considerations forselecting sediment treatment option(s); in some cases, the use of multiple devices may be appropriate.ImplementationThe following steps will help keep a clean site and reduce storm waterpollution:1.Select designated waste collection areas onsite.2.Inform trash-hauling contractors that you will accept only watertightdumpsters for onsite use.3.Inspect dumpsters for leaks and repair any dumpster that is notwatertight.4.Provide an adequate number of containers with lids or covers that can beplaced over the container to keep rain out or to prevent loss of wasteswhen it is windy.5.Plan for additional containers and more frequent pickup during thedemolition phase of construction.6.Collect site trash daily, especially during rainy and windy conditions.7.Remove this solid waste promptly since erosion and sediment controldevices tend to collect litter.8.Make sure that toxic liquid wastes (used oils, solvents, and paints) andchemicals (acids, pesticides, additives, curing compounds) are notdisposed of in dumpsters designated for construction debris.9.Do not hose out dumpsters on the construction site. Leave dumpstercleaning to the trash hauling contractor.10.Arrange for regular waste collection before containers overflow.11.Clean up immediately if a container does spill.12.Make sure that construction waste is collected, removed, and disposed ofonly at authorized disposal areas.Collection, Storage, and Disposal·Littering on the project site should be prohibited.·To prevent clogging of the storm drainage system, litter and debrisremoval from drainage grates, trash racks, and ditch lines should be apriority.·Trash receptacles should be provided in the contractor's yard, field trailerareas, and at locations where workers congregate for lunch and breakperiods.·Litter from work areas within the construction limits of the project siteshould be collected and placed in watertight dumpsters at least weekly,regardless of whether the litter was generated by he contractor, the public,or others. Collected litter and debris should not be placed in or next todrain inlets, storm water drainage systems, or watercourses.·Dumpsters of sufficient size and number should be provided to containthe solid waste generated by the project.·Full dumpsters should be removed from the project site and the contentsshould be disposed of by the trash hauling contractor.·Construction debris and waste should be removed from the site biweeklyor more frequently as needed.·Construction material visible to the public should be stored or stacked inan orderly manner.·Storm water runoff should be prevented from contacting stored solidwaste through the use of berms, dikes, or other temporary diversionstructures or through the use of measures to elevate waste from sitesurfaces.·Solid waste storage areas should be located at least 50 ft from drainagefacilities and watercourses and should not be located in areas prone toflooding or ponding.Inspection and MaintenanceInspect and verify that activity-based BMPs are in place prior to thecommencement of associated activities. While activities associated with theBMP are under way, inspect weekly to verify continued BMP implementation.Inspect BMPs subject to non-stormwater discharge daily while non-stormwaterdischarges occurInspect construction waste area regularly.Arrange for regular waste collection. VEHICLE AND EQUIPMENT FUELINGDescription and PurposeVehicle equipment fueling procedures and practices are designed to prevent fuel spills and leaks,and reduce or eliminate contamination of stormwater. This can be accomplished by using offsitefacilities, fueling in designated areas only, enclosing or covering stored fuel, implementing spillcontrols, and training employees and subcontractors in proper fueling procedures.LimitationsOnsite vehicle and equipment fueling should only be used where it is impractical to send vehiclesand equipment offsite for fueling. Sending vehicles and equipment offsite should be done inconjunction with a Stabilized Construction Entrance/ Exit.ImplementationUse offsite fueling stations as much as possible. These businesses are better equipped to handlefuel and spills properly. Performing this work offsite can also be economical by eliminating theneed for a separate fueling area at a site.Discourage "topping-off" of fuel tanks.Absorbent spill cleanup materials and spill kits should be available in fueling areas and on fuelingtrucks, and should be disposed of properly after use.Drip pans or absorbent pads should be used during vehicle and equipment fueling, unless thefueling is performed over an impermeable surface in a dedicated fueling area.Use absorbent materials on small spills. Do not hose down or bury the spill. Remove theadsorbent materials promptly and dispose of properly.Avoid mobile fueling of mobile construction equipment around the site; rather, transport theequipment to designated fueling areas.Train employees and subcontractors in proper fueling and cleanup procedures.Dedicated fueling areas should be protected from stormwater runon and runoff, and should belocated at least 50 ft away from downstream drainage facilities and watercourses. Fueling mustbe performed on level-grade areas.Protect fueling areas with berms and dikes to prevent runon, runoff, and to contain spills.Nozzles used in vehicle and equipment fueling should be equipped with an automatic shutoff tocontrol drips. Fueling operations should not be left unattended.Federal, state, and local requirements should be observed for any stationary above groundstorage tanks.Inspection and MaintenanceVehicles and equipment should be inspected each day of use for leaks. Leaks should be repairedimmediately or problem vehicles or equipment should be removed from the project site.Keep ample supplies of spill cleanup materials onsite.Immediately clean up spills and properly dispose of contaminated soil and cleanup materials.SOLID WASTE MANAGEMENTDescription and PurposeSolid waste management procedures and practices are designed to prevent orreduce the discharge of pollutants to stormwater from solid or constructionwaste by providing designated waste collection areas and containers, arrangingfor regular disposal, and training employees and subcontractors.Suitable ApplicationsThis BMP is suitable for construction sites where the following wastes aregenerated or stored:1.Solid waste generated from trees and shrubs removed during landclearing, demolition of existing structures (rubble), and buildingconstruction2.Packaging materials including wood, paper, and plastic3.Scrap or surplus building materials including scrap metals, rubber, plastic,glass pieces and masonry products4.Domestic wastes including food containers such as beverage cans, coffeecups, paper bags, plastic wrappers, and cigarettes5.Construction wastes including brick, mortar, timber, steel and metal scraps,pipe and electrical cuttings, nonhazardous equipment parts, styrofoam andother materials send transport and package construction materialsC407SWPPINFORMATION18095Project Number:Drawing Number:Certified By:Checked ByDrawn ByIssue DateRevisions:PROJECT:Scope Drawings:CARMEL, INDIANA NEW FOR CARMEL CLAY SCHOOLS CARMEL ELEMENTARY SCHOOLSDrawing Title:06-21-19SOMK