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• <br />Supplement To General <br />Installation Guidelines/ <br />Slopes And Channels <br />Subgrade / Slopes & Channels: On slopes and chan- <br />nels, the site must be shaped to the design specifica- <br />tions (Slope gradient, Density of soil & etc.) The site <br />must be groomed to be free of soil clods, clumps, rocks <br />or equipment imprints of any kind that would prevent <br />the blanket from lying flush against the surface <br />contour. <br />Seeding / Slopes & Channels: For non soil filled <br />applications on slopes and channels, hydro -seed, board <br />cast or drill seed over prepared soil before blanket is <br />deployed. Make sure to hydro -mulch after seeding and <br />before the blanket is installed to ensure the seed is in <br />direct contact with the soil. Seed mixes with adequate <br />pure live seed ratios must be used to ensure proper <br />germination ratios and successful vegetation establish- <br />ment. Consult your local distributor or seed supplier to <br />obtain a proper seed mix. <br />Anchor Trench & Check Slots / Slopes & <br />Channels: Anchor trenches are required to securely <br />fasten the blanket to the subgrade surface. Anchor <br />trenches and intermediate check slots are typically 6 -9 <br />inches wide and 6 -9 inches deep. The blanket is <br />installed in the trench and fastened to the bottom with <br />staples spaced 1 -3 ft. apart. The anchor trenches and <br />checks slots are then back filled and compacted in suc h <br />a manner not to damage the blanket. (See Slope & <br />Channel Isometric View) <br />Anchor Trench / Slopes: Anchor trenches should be <br />installed at least .l ft., beyond the crest of the slope. <br />(See Longitudinal Anchor Trench Fig. 2) <br />Anchor Trench / Channels: In a channel anchor <br />trenches are installed at the beginning of the channel. <br />(See Initial Channel Anchor Trench Fig. 1 & Longitudinal <br />Anchor Trench Fig, 2) <br />Check Slots / Slopes: For maximum performance of <br />your product, an intermediate check slot may be <br />required on long slopes that exceed one roll length. <br />Intermediate check slots should be spaced approxi- <br />mately 20 — 60 ft. intervals down the slope depending <br />on the blanket type, slope length and soil conditions. <br />Consult your local distributor or blanket manufacturer <br />directly to confirm the check slot installation procedure. <br />(See Intermediate Check Slot Fig. 3) <br />Check Slots / Channels: In a channel, check slots are <br />spaced approximately 25 — 60 ft. intervals down stream <br />depending on flow conditions, channel gradient and <br />time to vegetate. (See Intermediate Check Slot Fig. 3 <br />& Cannel Isometric View) Field Joining And Anchoring: <br />The blanket is rolled down the slope or channel loosely <br />to maintain contact with the soil at all times. Side to <br />side overlap between rolls are 3 -4 inches minimum and <br />anchored on 2 -3 ft. intervals minimum. End to end <br />splice overlap between rolls are 1 -3 ft. minimum and <br />anchored with two rows of staples on 1 ft. intervals <br />minimum. Overlaps are shingled in the direction of <br />flow. <br />Staple patterns will vary depending on application, soil <br />type, slope or channel gradient and etc. (See Staple <br />Pattern Guidelines) A rule of thumb for estimating the <br />amount of staples required for a project is as follows: <br />Steep Slopes / 1:1 and greater ......2-4 staples per sq. yd. <br />High Flow Channel ..............3 -4 staples per sq. yd. <br />Low Flow Channel ............... -3 staples per sq. yd. <br />Install additional staples as required to ensure the <br />blanket is always in contact with the soil, regardless of <br />suggested staple patterns. <br />Anchoring Devices. Use a 6 inch x 1 inch 11 gauge <br />minimum metal staple in heavy compacted soil. In <br />loose soil conditions use a 8 inch x 1 inch it gauge <br />minimum metal staple. Other approved anchoring <br />devices in loose soil conditions are as follows: <br />12 inch x 1.5 inch metal staples. <br />18 inch pins with 1.5 inch diameter washer. <br />12 -30 inch ] -Shape pins made from bent 1/4 inch wire or <br />rebar. <br />Install staples or pins so that the top of the anchor, is <br />flush with the soil surface. <br />Special Installation & Conditions: The installation <br />guidelines are recommendations only. You should <br />always confirm the installation procedure with your <br />local distributor or blanket manufacturer to ensure <br />maximum performance of the product. All design speci- <br />fications prepared by a qualified design consultant or <br />engineer supersede these recommended guidelines... <br />Product selection software, which some manufactures <br />claim to be design software, use versions of the univer- <br />sal soil loss equation, national rainfall and soil survey <br />charts to fabricate a formula that will make a mathe- <br />matical blanket type selection. <br />This approach to computerize product selection should <br />never be used to select a blanket typ e <br />project application because it circumvents the base line <br />data collection process that all project specifiers <br />regardless of scope are required to do if <br />n of <br />a y doe s not <br />success is expected. This typ e of <br />allow the specifiers to use site specific project data that <br />is directly revelant to the application design and prod- <br />uct performance. <br />The USLE is designed to calculate total tons of potential <br />soil erosion from a site using historical regional data as <br />factors in the equation. These assumptions do not and <br />cannot quantify or guarantee product performance. <br />Design software may be useful in channel design to. <br />determine or limit the potential shear stress forces the <br />channel lining materials are subjected to. <br />