construction contract standards page. Woven Stabilization and Separation Geotextiles, - Dimensions & Weights for EcoTubes Geotextile Dewatering Tubes, - Dimensions & Weights for EnviroGrid Cellular Confinement, - Material Safety Data Sheet (MSDS) - Drainboard, - Material Safety Data Sheet (MSDS) - Stratagrid, - Material Safety Data Sheet (MSDS) - Envirogrid, - Product Advantages of EcoTubes Geotextile Dewatering Tube, - Product Benefits of EcoTubes Sludge Dewatering Tubes, - Product Benefits of US Fabrics' Foundation Drains, - Product Benefits of US Fabrics' Sheet Drains, Design/Installation Guidelines; Applications, - Comparing Old Style & New Style - Strata Geogrid, - French Drain Exterior Foundation Install, - Geogrid & Welded Wire Form Inside Corner Placement, - Installation Guideline for Separation Heavy Geotextile, - Installation Guideline for Separation Medium Geotextile, - Sheet Drain Exterior Foundation Install, - Theoretical Tube Volumes & Dewatering Capabilities, - Typical Cross Section - Vegetated Reinforced Soil Slope, - Equivalent Products for Composite Drains, - Volumes & Dewatering Capabilities for EcoTubes Geotextile Dewatering Tubes, - Geogrid Quality for Finished Product and Raw Materials, - Use Woven Geotextiles Instead of Geogrids, - Municipal Waste Water & Water Treatment w/ EcoTubes, - SRW (Segmental Retaining Wall) Drainage. Rock Slope Protection practice is intended for slopes too unstable for revegetation practices alone. rock slope protection (3/8 t, class vi, method b) (ton) 723060 rock slope protection (300 lb, class iv, method b) (cy) . endobj If your 20'x10' patio is to have a 6" base, then you should excavate a total area of 21' (20' +6" +6") by 11' (10' +6" +6"). DM[2TI=lGQx7
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0=F5VvL(^f Vegetation (see . 0000002313 00000 n
Check to ensure that slopes and foundation areas are graded and compacted to specified tolerances. State-furnished materials and expenses, as well as supplemental work items and descriptions. YOU MUST NOTIFY US FABRICS BEFORE RECEIVING PRICING. TAR_%R5Wa%*x4ux-x5d1c
iU:v9b!KXGcFK 1fN2 t K! % > To ensure the success of Method A, ensure that the bearing of rocks from one to the other follows specifications and that the use of chinking rocks is limited to filling voids. Riprap can be used to stabilize slopes to prevent erosion and provide support. 1, METHOD B) (TON), ROCK SLOPE PROTECTION (NO. The following common types of slope protection are covered in this section: Other protective devices are used in conjunction with highway construction, and when used, they are included in the contracts special provisions. Geofabrics offers a range of engineered slope, embankment and retaining wall solutions of use in transport infrastructure projects. /OP true {s9y^ 463 0 obj
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Rock riprap consists of loose rock that is dumped on the slope and distributed. NTPEP Datamine Information: RG80NC is a tracking model number for the following manufacturers products: Mirafi 180NC, SKAPS GE180/GT180C or Propex 861. Erosion control is an important element of successful slope protection. FDM 10-10-3 Smooth the graded foundation. Barrier Landscape Edging & Paver Edging 6'/8. C-15 Permeable rock jetties (fish habitat structures) C-8 C-16 Close-up of permeable rock jetty C-8 C-17 RSP tied to solid rock outcrop, natural impermeable retard (jetty) C-9 C-18 Soil-filled voids, natural vegetation C-9 C-19 Channel cut through deposited beach sand C-10 C-20 Layers of deposited sand C-10 Other Names Rock Slope Protection. Intermediate, or B dimension (i.e., width) where A dimension is length, and C dimension is thickness. Proven Product Track Record (Aggregate is widely accepted and approved)Wilson Quarry Products are recognized as the Industry Standard in the Monterey Bay Area, Product meets and is Certified for Army Corp Projects. 9 0 obj Click on a heading to sort by that heading. 0000011079 00000 n
AASHTO is typical mass of 4.1 sy/oz.. Order corrective work when necessary. California Department of Transportation Erosion control devices provide direct protection to the soil surface therefore, are considered one the best measures for preventing erosion. Polypropylene is stable within a pH range of 2 to 13. endobj HToL[U?Ayb:V;%Y48{RMLIlq&+J[mNN?J;A? Project Details For EA 04-0A0204 ITEM NUMBER 729011 ROCK SLOPE PROTECTION FABRIC (CLASS 8) Bid Opening Date (mm-dd-yyyy): 04-21-2021 District-County-Route-Postmile: 04-SON-1-R15./R15.7 Quantity: 220 SQYD Unit Price: $21.50 Total Price: Type of work: REALIGN ROADWAY <> endobj The Maryland General Assemblys Office of Legislative Audits operates a toll-free fraud hotline to receive allegations of fraud and/or abuse of State government resources. 3, METHOD B) (CY), ROCK SLOPE PROTECTION (NO. 2, METHOD B) (CY) (ENGMET), ROCK SLOPE PROTECTION (NO. endobj 10 0 obj %PDF-1.4 Copies of these details are made available below in both Adobe Portable Document Format(PDF) and AUTOCAD Drawing (DWG) file formats. 5 0 obj Start by choosing whether your patio is a **single rectangle** or if it has a different shape, in which case you. At the start of gabion placement, require the contractor to verify the minimum unit weight of the gabions to ensure it meets specifications. 0000009682 00000 n
For RSP Classes IX thru XI, use Class 10 RSP-fabric. (b) Paving fabric specification requires a minimum mass of 4.1 sy/oz. IMPLEMENTATION OF ROCK SLOPE PROTECTION (RSP) DESIGN For Type R, F, or Common stone riprap, provide Type 2 filter fabric when shown on the plans. 2005), although maintenance considerations may serve to reduce this maximum size. Use the size and composition of yarn that is recommended by the fabric manufacturer. Manufacturers information can be found at: Copyright Maryland.gov. Soil Stabilization Matting - Channel Application, Perm. Lap 6'' min. Suggested levels of inspection for slope protection activities are: Ensure the contractor is actively performing quality control on placing slope protection and slope paving throughout the operations. Stable rock sizes and flow depths for riprap-lined channels having gradients between 2 percent and 40 percent may Slope Protection consists of rock, concrete, or concreted rock or slope paving ROCK SLOPE PROTECTION ROCK SHOULD DEMONSTRATE Stability: Angular shapes may be used on any planed slope Durability: Resist degradation and have a durability of 52 minimum (Caltrans) Consistency: Product is the same load after load. Contact your local TenCate Geosynthetic representative for the proper use and specification of these products. The plans will designate which type applies at each location. <>/Metadata 7 0 R/OpenAction 8 0 R/Outlines 110 0 R/PageLayout/SinglePage/PageMode/UseOutlines/Pages 11 0 R/StructTreeRoot 137 0 R/Type/Catalog/ViewerPreferences<>>> The equilibrium soil-to-geotextile system that allows for adequate movement of a liquidin the plane of the geotextile over the service lifetime of the application. 7 0 obj RG12N Nonwoven Geotextile with a 300 lbs grab tensile strength and a flow rate of 65 gallons a minute per square foot. %PDF-1.3
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A geotextile is typically defined as any permeable textile material used to increase soil stability, provide erosion control or aid in drainage. 1 0 obj For details about concrete production, review Section 4-90, Concrete, of this manual. endobj item code description; 729012 rock slope protection fabric (class 10) 729011 rock slope protection fabric (class 8) 723220 concreted-rock slope protection (1/4 t, class v, method b) (ton) Refer to Section 6-202, Responsibilities for Acceptance of Manufactured or Fabricated Materials and Products, of this manual for additional information. trailer
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Rock Slope Armor is a layer of rock, such as ditch lining rock, cobble rock, concrete rubble, or riprap, which is hand or mechanically placed on an erodible soil slope. 0000005681 00000 n
Roll size is 15'x300 Equivalent to Mirafi 1120NC or Skaps GT112 (Click here for spec) Mirafi 160N is a lightweight nonwoven geotextile that meet AASHTO M288 Class 2 geotextiles for separation and subsurface drainage. uuid:30dd8676-a64b-4579-9ccf-fc82965d356f When slope paving with concrete pavers is specified, ensure the special provision requirements are met. We're available on the following channels. Contract Cost Data Project Details. 4-7203C Small-Rock Slope Protection The small-rock slope protection method consists of excavating and backfilling the footing trench, placing rock slope protection fabric as shown, and placing small rocks on the slope. 72-2.02B Fabric Fabric must be RSP fabric that complies with the class shown in the following table: 72-4 SMALL-ROCK SLOPE PROTECTION 72-4.02 MATERIALS >> Cold storms bringing wind, rain and low-elevation snow heavy at times are forecast through early March. The devices include ground covers and channel liners such as: 1. Mirafi N-Series nonwoven polypropylene geotextiles are used for soil separation, drainage in Transportation, Building Site, and Water Infrastructure projects such as subsurface drainage, permanent erosion control and roadway separation applications. US 160NW resists ultraviolet and biological deterioration, rotting, naturally encountered basics and acids. Riprap is a permanent layer of large, angular stone, cobbles, or boulders typically used to armor, stabilize, and protect the soil surface against erosion and scour in areas of concentrated flow or wave energy. Review contractors verification of unit weight of rock-filled gabions. 0000009704 00000 n
In 2007, the FAA approved construction of a new center field taxiway (Taxiway Mike) to alleviate airfield congestion. concreted-rock slope protection (1/2 t, class vii, method b) (ton) 723215 concreted-rock slope protection (1/4 t, class v, method b) (cy) 723220 concreted-rock slope protection (1/4 t, class v, method b) (ton) 729011 rock slope protection fabric (class 8) 729012 rock slope protection fabric (class 10) 750020 rigid rail fall protection system This has been superseded by Caltrans New Riprap Classes. Click on the to send the number to the Slope Protection consists of rock, concrete, or concreted rock or slope paving, ROCK SLOPE PROTECTION ROCK SHOULD DEMONSTRATE, THE PLACEMENT METHODS DESIGNATED BY CALTRANS, ADVANTAGES OF USING RIP RAP OR STONE PROTECTION FROM WILSON QUARRY (AROMAS), Make certain of the Product RequiredProject Service Requirements, Specifying Agency (Caltrans, Green Book, Army Corp or Other), Special Provisions addressing additional specifications, Certification Required (Submittals) Caltrans, Army Corps, other agency or engineer, Quantity Required (Specific GravityConversion Tons to Cubic Yards), Product Availability (Available when required, can handle Daily Shipping Requirements), The Reputation of your Supplier and their Products & Services, 100% Crushed Granite (Provides Superior Stability and Durability), Many different Rip Rap types available:All Caltrans Classes and Sizes, High Daily Production and Shipping Capacity (Can Handle Large & Small Jobs), Graniterock can provide delivery to your jobsite if desired. <> Before placement of the broken concrete, inspect the material and be sure the reinforcement has been removed flush to the surface of concrete. endstream These products can be used in areas where they meet the local agency requirements. Mirafi 1100N, 1120N and 1160N are heavy weight nonwoven geotextiles for more severe or extremely harsh conditions, such as rip-rap and revetment applications. "QamV(Z3VL> 0000002044 00000 n
com routes make excellent running trails for serious runners and casual joggers, alike. Decide whether an adequate number has been provided for the particular installation. Test panels may be specified in the special provisions. Concrete canvas (CC) has the potential to become a widely used slope protection material owing to advantages such as flexibility, fast construction with low labor costs, and quick strength development. (For large riprap, consider a four inch layer of sand to protect the . If there are no prevailing agency specifications, it is recommended to follow AASHTO M288 for subsurface drainage applications. Ensure that the contractor performs concrete finishing as specified and that the slope paving is cured by one of the specified methods. Mirafi 135N, 140NL and 140NC are lighter weight versions of Mirafi 140N . The gabion method consists of placing wire mesh box-shaped baskets filled onsite with hard, durable rocks. 6 0 obj +NXR!ft]l|\P2. Properly designed slope protection and stabilization has to include two components: a vegetational-biological and a mechanical-structural component. GHnBc__'h1'u]SO0P+R&yGeJ$FP?cSp28
1}9AQ #T6Bc*)_vU"]T hY# Contact our sales team at 1-863-270-8118 to discuss your erosion control requirements. There are three material gradation requirements based on required rock layer thicknesses. 6'' min. If you have any questions or would like to learn more, please contact us. EZw5'dr=`j+2\8:U.|V,%)~h/X8ps B. Cables. %PDF-1.4
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When placing rocks, the contractor should ensure each placed rock is stable and not dependent on the one on top to hold it in place. If excess concrete remains on the surface, the finished product, when used in streams, will be too smooth and, along the protection, velocities will increase beyond those intended during design. Rock mesh slope protection is a technique to control rockfalls . Geosynthetic Bond Breaker (Call for product. stream The contract will identify the designated method. If the rock layer is shown as 7 inches thick, comply with grading shown in the following table: If the rock layer is shown as 5 inches thick, comply with the grading shown in the following table: If the rock layer is shown as 4-inches thick, comply with grading shown in the following table: Granular material must contain at least 90 percent crushed particles when tested under California Test 205. Check the area to be protected to ensure that the required expansion joints are in place. Chapter 4: Construction Details, Section 72: Slope Protection, Direction of flow and angle of impingement at various water stages, Capability of adjacent soil types to resist erosion from wash and eddy currents. application/pdf For combination slope/bench systems in TYPE A soil and a trench depth of less than 8 feet, the steepest maximum allowable slope is 53 degrees from the horizontal. The concreted-rock slope protection method is used where large rock is not economically available in large quantities, yet a heavy, service type of protection is required. Keep records up to date. If you have any questions about the consistency of the gabions, you may also order the unit weight to be verified during the course of the work. (One call ordering and delivery). The gabions are placed on filter fabric as detailed in the plans and specifications. Place a layer (six inch minimum) of TenCate develops and produces materials that function to increase performance, reduce costs and deliver measurable results by working with our customers to provide advanced solutions. Draw Down Device, Temporary Access Bridge (1 of 2, PDF only), Temporary Access Bridge(2 of 2, PDF only), Temporary Access Culvert (1 of 2, PDF only), Temporary Access Culvert (2 of 2, PDF only), Onsite Concrete Washout Structure (1 of 2, PDF only), Onsite Concrete Washout Structure (2 of 2, PDF only), If you are experiencing difficulty accessing these details or if there are anyquestions, please contact the Sediment, Stormwater & Dam Safety Program at (410) 537-3543 or by email (Amanda.Malcolm@maryland.gov, National Human Trafficking Hotline - 24/7 Confidential. The best slope protection type for a given situation depends on the conditions where the installation is to be made, availability of protection material, cost of the various types, and protection desired. In making such a decision, observe the following: Take pictures to document existing conditions and verify that Form CEM-3101, Notice of Materials to Be Used, includes the materials for slope protection. Fabric Class Class Largest rock gradation class used in slope protection 8 Classes I-VIII 10 Classes IX-XI Replace the 1st paragraph of section 73-3.028 with: Rocks for concreted-rock slope protection must comply with the gradation shown in the following table: Concreted-Rock Gradation . Our TerraTex brand offers full-spectrum performance delivery - groundwater filtration and drainage, soil separation and reinforcement, geomembrane protection, sprayed liner substrate, oil-and-gas industry drilling pad and access-road enhancement, as well as pavement overlay and bond-breaker applications. Source: Caltran Highway Design Manual, Chapter 870 4 0 obj Retaining Walls & Slope Stability The chart below lists US Fabrics' geosynthetics meeting CALTRANS specifications. Draw Down Device, Sediment Basin Schematic - Vert. When specified, ensure coloring is added to the concrete. Use 5 to 7 st Otherwise, placement could result in what is known as rockers or unstable rocks. They are designed to protect against raveling-type rockfall that involves small-volume slope failures (up to about 7.6 m3 or 10 yd3) or blocks up to 1.5 m (5 ft), depending on the strength of the mesh used (Muhunthan et al. Before construction of any type of slope protection, review the plans, Standard Specifications, special provisions, any pertinent preliminary test data, and the location of the installation. 1800 Washington Blvd., Baltimore, MD 21230, Stormwater, Dam Safety, and Flood Management Home, Plan Review for State and Federal Projects. Place a highly permeable and appro-priately sized geotextile filter fabric on the prepared slope following the manufacturer's recommendations. /Filter/FlateDecode Complete the Patio or Walkway 6. L Earth Compacted Fabric Engineering 6'' 1'-0'' centers Staples at 6'' 2'' 6'' (Rock Splash Basin) TYPE 4 1 2 (Rock Slope Protection) TYPE 5 Staples at 12 inch centers. :t4NV]j{/mtqF*sx[%M
5%(/%(Z-F|[atK5[~{a~EwDCV:/#K)f~7*RsAnnJa>Jg-m^>\V7EOG3o?nGYIFze/l( I!&VXo]mm#7I0:EK7_LFwek This article studies the mechanical properties and stability of CC slope protection by comparing it with conventional material (shotcrete). <>stream You may be trying to access this site from a secured browser on the server. . - Shoreline Protection with EcoTubes™ CALTRANS does not have an APL/QPL for fabrics. Shop Lowe's for solutions to control erosion on slopes, as well. Method A is used where the stability of the rock slope protection is considerably dependent on the manner in which the individual rocks are placed. 2. The plans indicate the minimum depths of foundations. Inspect the rock to ensure it has been cleaned of any adhering dirt and clay and is moistened before concrete placement. US 160NW is a nonwoven needlepunched geotextile made of 100% polypropylene staple filaments. 0000014231 00000 n
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1 Angular shaped rock may be used on any planned slope. 0000000871 00000 n
Fabric must be RSP fabric that complies with the class shown in the following table: Rock must be cobble, gravel, crushed gravel, crushed rock, or any combination of these. 2019-07-30T13:47:33-04:00 Review the plans for the location and number of weep holes. If using geotextile fabric, place on the smoothed foundation, overlap the edges at least 12 inches and secure with anchor pins spaced every three feet along the overlap. Type R. Use stones between 50 and 250 lb. The challenge was to construct a new taxiway over areas that were built on tidal flats and land reclaimed from Boston Harbor. Take care not to tear the filter fabric during installation. Note any changes that may have occurred between the preliminary design studies and the start of construction. The Difference Mirafi N-Series Nonwoven Geotextiles Make: The placement of a flexible, porous geotextile between dissimilar materials so that the integrity and intended functions of both materials remain intact or are improved. Technical Support available for assistance. 0000005658 00000 n
conforming to the requirements of 710-03 Vinyl Coated Steel Fence Fabric, Class A Wire Diameter, except color. Nominal RSP class by median particle diameterb Nominal median For method A placement and the class of RSP described, comply with the rock grading shown in the following table: For method B placement and the class of RSP described, comply with the rock grading shown in the following table: Rock must have the values for the material properties shown in the following table: Select rock so that shapes provide a stable structure for the required section. At the terminals of protection, ensure the contractor is particularly careful to avoid erosion and undercutting. If necessary, order additional weep holes. Caltrans requires the use of these new RSP gradations starting August 1st, 2016 in new projects and those not yet at 30 percent PS&E stage. The concrete slope protection method consists of paving the embankment with portland cement concrete. The small-rock slope protection method consists of excavating and backfilling the footing trench, placing rock slope protection fabric as shown, and placing small rocks on the slope. Mirafi N-Series nonwovens combine high water flow rates, high soil interaction and durability while providing excellent soil particle retention. 0000002336 00000 n
/Type/ExtGState The heavier fabrics provide more strength and are less likely to tear when large class II or Class III boulders are placed on them. Obtain initial samples and have them tested for the specified attributes. Values shown are based on Table 873.3A dimensions and an assumed specific gravity of 2.65. When slope protection is paid by weight, refer to the discussion of weighing and metering procedures in Section 3-902E, Weighing Equipment and Procedures, of this manual. It consists of a layer of very large stones interlocked together and acts as a barrier on slopes that are unstable because of seepage problems or in areas that are receiving a large concentrated flow. endobj ), Geocomposite Wall Drain (w/ 6oz on 1 or 2 sides - Please specify.). JavaScript is required to use content on this page. Click it again to reverse the order. Soil Stabilization Matting - Slope Application, Perm. >> Links to important documents and pages can be found below the chart. Also, ensure the contractor does not drop rock into place; otherwise, cracking or breaking may occur. 0000012187 00000 n
Provide galvanized guide rail cables a minimum 19 mm in diameter, consisting . The contract plans will designate the required rock layer thickness for each location. <> 0000007052 00000 n
Review Section 4-90, Concrete, of this manual for details about concrete production. This section provides guidelines for inspecting slope protection for work specified under Section 72, Slope Protection, of the Standard Specifications. 0000014254 00000 n
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(j($M/!bMbo,iDjQL1{L! Observe construction to ensure the contractor does the placing, finishing, and curing as specified. Information reported to the hotline in the past has helped to eliminate certain fraudulent activities and protect State resources. endobj Refer to Section 4-96, Geosynthetics, of this manual for guidelines on inspecting and accepting rock slope protection fabric. RSP-fabric Type of geotextile and quality requirements per Section 96 Rock Slope Protection Fabric of the Standard Specifications. The equilibrium soil-to-geotextile system that allows for adequate movement of a liquid across the plane of the geotextile with limited soil loss over the service lifetime of the application. Contact Us Your search for great running gear starts and ends with us. Please enable JavaScript in your browser. The method is particularly adaptable to locations where high-velocity flow is not detrimental, but desirable, and the hydraulic efficiency of smooth surfaces is important. Please enable scripts and reload this page. (a) Exception: US 250NW is 5 pounds short on "grab breaking load" for Sediment Filter Bags. { , IMPLEMENTATION OF ROCK SLOPE PROTECTION (RSP) DESIGN. 3. (a) Exception: US 250NW is 5 pounds short on "grab breaking load" for Sediment Filter Bags. Applicability Rock Slope Armor is applicable to: Slopes where unanticipated flows are encountered. For measurement and payment, do the following: Chapter 1 - Caltrans Construction Organization, CalOES: Power Outage and Fire Recovery Resources. Without proper slope protection, a serious erosion problem known as "beaching" can develop on the upstream slope. <>/XObject<>/Properties<>>>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> To respond to the different problems associated with instability of rock faces, Geofabrics also has a broad range of independently verified rockfall mitigation systems. (see Riprap Slope Protection Worksheet). US Fabrics is proud to serve the geotextile needs of the State of Califronia, including: Los Angeles, San Diego, San Jose, San Francisco, Fresno, Sacramento, Long Beach, Oakland, Bakersfield, Anaheim, Santa Ana, Riverside, Stockton, Chula Vista, Fremont, Irvine, San Bernardino, Modesto, Oxnard, Fontana, Moreno Valley, Glendale, Huntington Beach, Santa Clarita, Garden Grove, Santa Rosa, Oceanside, Rancho Cucamonga, Ontario, Lancaster, Elk Grove, Palmdale, Corona, Salinas, Pomona, Torrance, Hayward, Escondido, Sunnyvale, Pasadena, Fullerton, Orange, Thousand Oaks, Visalia, Simi Valley, Concord, Roseville, Santa Clara, Vallejo, Victorville, El Monte, Berkeley, Downey, Costa Mesa, Inglewood, Ventura, West Covina, Norwalk, Carlsbad, Fairfield, Richmond, Murrieta, Burbank, Antioch, Daly City, Temecul and all other areas of California. BMP040 "rock slope protection (no fabric)" as applicable. Click on the to search for an item in 99 (30% off) Best Selling Saucony Flat Mask By mrhzid $8. Class E Revetment Erosion Stone or Class E Revetment Erosion Stone or A A Engineering Fabric Ditch Bottom 2' 2' Anchor Slot W 6'' min. You can also lay bags of sand along problem areas in your landscape to keep soil from washing away and to redirect water. There are three material gradation requirements based on required rock layer thicknesses. 0000013368 00000 n
Temporary structures shall be left in place until adequate vegetation and the permanent . On a cut slope, this could be due to . Soil Stabilization Matting - Slope Application, Clear Water Pipe Through Silt Fence/Super Silt Fence, Temporary Stone Outlet Structure (1 of 2, PDF only), Temporary Stone Outlet Structure (2 of 2, PDF only), Temporary Gabion Outlet Structure (1 of 2, PDF only), Temporary Gabion Outlet Structure (2 of 2, PDF only), Standard Inlet Protection (1 of 2, PDF only), Standard Inlet Protection (2 of 2, PDF only), Combination Inlet Protection (1 of 2, PDF only), Combination Inlet Protection (2 of 2, PDF only), Pipe Outlet Sediment Trap ST-I (1 of 3, PDF only), Pipe Outlet Sediment Trap ST-I (2 of 3, PDF only), Pipe Outlet Sediment Trap ST-I (3 of 3, PDF only), Stone/Riprap Outlet Sediment Trap ST-II (1 of 3, PDF only), Stone/Riprap Outlet Sediment Trap ST-II (2 of 3, PDF only), Stone/Riprap Outlet Sediment Trap ST-II (3 of 3, PDF only), Riprap Outlet Sediment Trap ST-III (1 of 3, PDF only), Riprap Outlet Sediment Trap ST-III (2 of 3, PDF only), Riprap Outlet Sediment Trap ST-III (3 of 3, PDF only), Concentric Trash Rack and Anti-Vortex Device (1 of 2, PDF only), Concentric Trash Rack and Anti-Vortex Device (2 of 2, PDF only), Types of Couplers for Corrugated Steel Pipe, Sediment Basin Schematic - Horiz.