HomeMy WebLinkAbout1.00 General Application Materials_Part22June 2008 TB-1 Trench Breakers (TB)EC-22 Description Trench breakers, also known as trench plugs, are used to slow the flow of subsurface water along a pipeline trench. Trench breakers may be constructed of materials such as sand bags or polyurethane foam. Applicability Trench breakers may be used in the following applications: On steep slopes. Above wetlands. At waterbody crossings. At road crossings. Design criteria No formal design is required. Construction specifications 1.Trench breakers should be installed both before and after the lowering-in of pipeline. 2.An engineer or similarly qualified professional shall determine the need for and spacing of trench breakers. Otherwise, spacing shall be according to the following table: Slope (%) Spacing (feet) 5 – 15 300 15 – 30 200 >30 100 June 2008 TB-2 3.At a minimum, install a trench breaker at the base of slopes greater than 5 percent where the base of the slope is less than 50 feet from a waterbody or wetland and where needed to avoid draining a waterbody or wetland. 4.Trench breakers should be installed to the top of the excavated trench line. Maintenance considerations The frequency of inspections should be in accordance with the Stormwater Management Plan. Repair any damaged areas. References Federal Energy Regulatory Commission (FERC), Upland Erosion Control, Revegetation, and Maintenance Plan. January 2003. 1 (12 /2014) 1 (12 /2014) 1 (12 /2014) 1 (12 /2014) Ditch Lining System (DLS)EC-24 March 2023 EC-24 Photograph DLS-1. Ditch liner installed for slope conveyance. Photo courtesy of SmartDitch. Description Ditch linings systems are corrugated sections of plastic sheet formed in a pretermined shape. Ditch lining systems are designed to limit infiltration of water from a stormwater control measure into underlying and adjacent soil. Such systems can be used to convey water through an area where there is a high potential for erosion. The ditch outlet must be equipped with outlet protection. Specific product names for this application include IntelliDitch and SmartDitch. Appropriate Uses Can be used in place of a temporary slope drain on long, steep slopes when there is a high potential of flow concentration or rill development. Can be used to form defined ditches that can control erosion, catch sediment and prevent side wall deterioration in drainage ditches with high flows of runoff. Can be used in place of concrete channels, rip rap or vegetated channels in areas where difficult access, uneven terrain and steep slopes with high runoff velocities are concerns. Design and Installation Effective use of ditch lining systems involves design of an effective collection system to direct flows to the ditch, proper sizing and anchoring of the ditch, and outlet protection. The temporary slope drain must be sized to safely convey the desired flow volume. The discharge from the slope drain must be directed to a stabilized outlet, temporary or permanent channel, and/or sedimentation basin. See details below for additional sizing and installation information. Temporary Slope Drains Functions Erosion Control Yes Sediment Control Yes Site/Material Management No Photograph DLS-2. Ditch liner installed in a diversion ditch for stormwater convetance. Photo courtesy of SmartDitch. EC-24 Ditch Lining Systems (DLS) EC-24 March 2023 Maintenance and Removal Field inspect lined irrigation ditches, laterals, or other components of the ditch lining system regularly to ensure proper operation and delivery of water. Remove any rocks, debris, or other obstructions from liner system to ensure maximum flow and efficiency. It may also be necessary to remove accumulated sediment at the outfall. Inspect anchors to ensure that they are secure. Drainage liner systems should be removed when no longer needed. When the systems are removed, the disturbed areas should be covered with topsoil, seeded, mulched or otherwise stabilized as required by the local jurisdiction. Installation detail from SmartDitch technical manual. Ditch Lining Systems (DLS)EC-24 March 2023 EC-24 Installation Guide Modified from Intelliditch Installation Guide for quick reference. Please see individual product websites for full installation instructions. It is recommended that the following industry standards be utilized as a resource when planning and executing work. Natural Resources Conservation Service Standard 428-c, IRRIGATION DITCH LINING, SEMI- RIGID FORMED PLASTIC Safety and Health Regulations for Construction (OSHA) 29 CFR 1926 Subpart C & Subpart P 1.. Shipping and Receivi Buyer/purchaser is responsible to inspect all components of delivery to ensure accurate count of liners and assembly kits. Inspect liners and packaging for any damage that may have occurred during shipping. 2.. Excavation and Surv Excavation: Excavate new or existing ditch to meet the following dimensions. Bottom width of ditch/channel = 24” maximum Top width of ditch/channel = 82” maximum Apron: ensure a minimum of 2’ each side of top width is flat, smooth and free of debris for anchoring. Depth: Top of ditch bank to flat bedding not to exceed 30” in depth. Survey: Ensure that grade line is established from point of diversion to point of discharge. Complete profile level survey to ensure that the final installation of liner systems can be placed on uniform slope from start to end with no low spots that could lead to potential overflowing. 3.. Installati of Apron: Install 8” thick, 24” wide concrete apron at the start and end of existing or new ditch canal. 4.. Installation of IntelliDitch™ Section Stage parts alongside ditch/channel. From survey stationing provided in profile survey, start installation of sections at the end or downstream of the ditch/channel. Place the first section with the female end of section terminating on the concrete apron. Flow arrow will be pointed downstream. Secure IntelliDitch™ Liner to concrete apron with ram set tool and pins. Place thick Silicone bead on edge of liner and concrete to prevent water from flowing under the liner section. EC-24 Ditch Lining System (DLS) EC-24 March 2023 Straight Corrugated Section Note: Silicone, Ramset Tool and Pins are NOT INCLUDED in assembly kits and are to be purchased by contractor or owner. Recommended Tools: Henry 10.1 oz. 884 Tropi-Cool 100% Silicone Roof Sealant-HE884004 - The Home Depot Ramset MasterShot 0.22 Caliber Powder Actuated Tool-40088 - The Home Depot Ramset 1 in. Drive Pins with Washers (100-Pack)-00797 - The Home Depot 5.. Assembly of Section Once end piece is secure continue to install liners (straight or outlet) sections by placing the hydrophilic gasket on the indentation of the female end corrugation of each section that is facing upstream thereafter. Place the next section with the male end downstream on top of the female connection having the hydrophilic gasket and secure mechanical connection with the (12) twelve 5/16” dia. bolts at the bolt ports either side of corrugation. Do not overtighten. Once all liners have been installed secure section to the upstream concrete apron and ramset in place. Place thick Silicone bead on edge of liner and concrete to prevent water from flowing under the liner section. Assembly of Sections Assembled Sections 6.. Anchor g: Anchor liner to the ground Place and earth anchor on each end and both sides of liner. Insert driving rod into earth anchor. Then place anchor and rod into the liner anchor port hole. EC-24 Ditch Lining System (DLS) EC-24 March 2023 Drive earth anchor with demolition hammer drill while holding both (2) two 3/32” stainless steel cable against driving rod. Drive earth anchor a minimum of 18” into the ground. Pull up both 3/32” cables to set earth anchor until tight and anchor is secure and not pulling up through the earth. Drive Bar with Earth Anchor Placed in Anchor Port Drive Earth Anchor min 18” in Depth Pull up to set earth anchor and insert 3/32” wires through anchor plate securing with metal crimp Insert both wires into the metal crimp and slide until the crimp is pushed firmly against the anchor port plate. Tuck both wires into the unused holes in the anchor plate so that the wires are hidden in the anchor port. Place cap over anchor plate and snap into place. Anchor each section at each end. Middle anchor optional. Corrugated Section anchored to the ground. Concrete Washout Area (CWA)MM-1 November 2010 Urban Drainage and Flood Control District CWA-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CWA-1. Example of concrete washout area. Note gravel tracking pad for access and sign. Description Concrete waste management involves designating and properly managing a specific area of the construction site as a concrete washout area. A concrete washout area can be created using one of several approaches designed to receive wash water from washing of tools and concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks. Three basic approaches are available: excavation of a pit in the ground, use of an above ground storage area, or use of prefabricated haul- away concrete washout containers. Surface discharges of concrete washout water from construction sites are prohibited. Appropriate Uses Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid concrete waste from onsite concrete mixing or concrete delivery. Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete washout, the soil must have adequate buffering capacity to result in protection of state groundwater standards; otherwise, a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater: The use of the washout site should be temporary (less than 1 year), and The washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. Design and Installation Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner. Although unlined washout areas may be used, lined pits may be required to protect groundwater under certain conditions. Do not locate an unlined washout area within 400 feet of any natural drainage pathway or waterbody or within 1,000 feet of any wells or drinking water sources. Even for lined concrete washouts, it is advisable to locate the facility away from waterbodies and drainage paths. If site constraints make these Concrete Washout Area Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-1 Concrete Washout Area (CWA) CWA-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated concrete washout devices or a lined aboveground storage area should be used. Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage areas. Pre-fabricated concrete washout container information can be obtained from vendors. Maintenance and Removal A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that adequate signage is provided and in good repair and that the washout area is being used, as opposed to washout in non-designated areas of the site. Remove concrete waste in the washout area, as needed to maintain control measure function (typically when filled to about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal location. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash water is allowed to evaporate and the concrete hardens, it may be recycled. Photograph CWA-3. Earthen concrete washout. Photo courtesy of CDOT. Photograph CWA-2. Prefabricated concrete washout. Photo courtesy of CDOT. Concrete Washout Area (CWA)MM-1 November 2010 Urban Drainage and Flood Control District CWA-3 Urban Storm Drainage Criteria Manual Volume 3 MM-1 Concrete Washout Area (CWA) CWA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP)MM-2 November 2010 Urban Drainage and Flood Control District SP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control. Description Stockpile management includes measures to minimize erosion and sediment transport from soil stockpiles. Appropriate Uses Stockpile management should be used when soils or other erodible materials are stored at the construction site. Special attention should be given to stockpiles in close proximity to natural or manmade storm systems. Design and Installation Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the phases of construction progress. Place sediment control measures around the perimeter of the stockpile, such as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the up-gradient side of the stockpile. Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14 days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Time frames for stabilization of stockpiles noted in this fact sheet are "typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that may be more prescriptive. Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be protected. Maintenance and Removal Inspect perimeter controls and inlet protection in accordance with their respective Control Measure Fact Sheets. Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be necessary. When temporary removal of a perimeter control measure is necessary to access a stockpile, ensure control measures are reinstalled in accordance with their respective design detail section. Stockpile Management Functions Erosion Control Yes Sediment Control Yes Site/Material Management Yes MM-2 Stockpile Management (SM) SP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise stabilize the ground surface where the stockpile was located.