914WALLS AND MISCELLANEOUS STRUCTURES

1089 Construction of Gabion Mattress associated with the soil -cement work will be measured and paid under the Riprap (Gabion Mattress) item. Payment for additional excavation, where determined by the Engineer to remove unsuitable material, per the requirements of Subsection 203- 5.03(A) of the specifications, will be made in accordance with the provisions of Subsection 109.04 of the specifications. Payment for Dewatering will be made on a Force Account basis in accordance with the requirements of Subsection 109.04 of the specifications. 914- 1 Description: The work under this section consists of furnishing all materials and constructing walls and miscellaneous structures at the locations and in accordance with the details shown on the project plans. 914- 2 Mater ials: Concrete shall be ClassS and of the compressive strength shown on the project plans. Concrete and reinforcing steel shall conform to the requirements of Sections 1006 and 1003 of the specifications , respectively. Masonry materials shall conform to the requirements specified on the project plans. 914- 3 Construction Requirements: Rustication, color coating or other wall treatments shall be in accordance with the details shown on the project plans or as specified in the Special Provisions. Excavation and backfill shall be in accordance with the requirements of Subsection 203- 5 of the specifications. 914- 4 Method of Measurement: Measurement of this work will be made by the square foot of wall constructed and will be measured along the front face of the wall from the top of footing to the top of wall cap. 914- 5 Basis of Payment: Payment for this work will be made at the contract price per square foot, which price shall be full compensation for the item complete, including necessary excavation, footings, backfilling, rustication and color coating as described herein and on the project plans. TABLE OF CONTENTS INDEX 1090 SECTION 915 TEMPORARY SILT FENCE: 915- 1 Description: The work under this section shall consist of furnishing, installing, maintaining, and removing a geotextile barrier -fence designed to remove suspended particles from the water passing through it. The temporary silt fence shall be installed in accordance with the details and at the locations as shown on the proj ect plans. The installation shall be in accordance with the requirements of these specifications except as otherwise directed or approved by the Engineer. The quantity of temporary silt fence to be installed will be affected by the actual conditions which occur during the construction of the project. 915- 2 Materials: 915- 2.01 Geotextile Fabric: The silt fence geotextile fabric shall be supplied in accordance with the material requirements of Subsections 1014- 1 and 1014- 8 of the specifications. This specification provides criteria for wire supported geotextile silt fence as well as a self supporti ng geotextile silt fence. 915- 2.02 Fabric Packaging, Handling, and Storage: The identification, packaging, handling, and storage of the geotextile fabric shall be in accordance with ASTM D4873. Fabric rolls shall be furnished with suitable wrapping for pr otection against moisture and extended ultraviolet exposure prior to placement. Each roll shall be labeled or tagged to provide product identification sufficient to determine the product type, manufacturer, quantity, lot number, roll number, date of manuf acture, shipping date, and the project number and name to which it is assigned. Rolls will be stored on the site or at another identified storage location in a manner which protects them from the elements. If stored outdoors, they shall be elevated and protected with a waterproof, light colored, opaque cover. 915- 2.03 Posts: Posts shall be a minimum of 3 feet plus the burial depth in length and may be made of either wood or steel. Soft wood posts shall be at least 3 inches in diameter, or nominal 2 -inch by 4-inch and straight enough to provide a fence without noticeable misalignment. If oak posts are used, the size may be reduced to 1- 1/2 by 1- 1/2 inches with a minus tolerance of 1/8 inch, provided that the cross sectional area is a minimum of 2.25 squar e inches. Steel posts shall have a minimum weight of 1.3 pounds per foot, and have projections for fastening the wire and fabric to the fence. TABLE OF CONTENTS INDEX 1091 915- 2.04 Wire Support Fence: Wire support fence shall be a minimum of 32 inches high and shall be 12 gauge steel wire mesh. 915- 2.05 Fasteners for Wooden Posts: Wire staples shall be No. 17 gauge and shall have a crown at least 3/4- inch wide and legs at least 1/2- inch long. Staples shall be evenly spaced with at least five per post. Nails shall be 14 gauge, 1 inch long with 3/4 -inch button heads. Nails shall be evenly spaced with at least four per post. 915- 3 Construction Requirements: 915- 3.01 Silt Fence Installation: The contractor shall install a temporary silt fence as shown on the plans, and at other locations as directed or approved by the Engineer. Fence construction shall be adequate to handle the stress from sediment loading. Geotextile at the bottom of the fence shall be buried a minimum of 6 inches in a trench so that no flow can pass under the barrier. The trench shall be backfilled and the soil compacted over the geotextile. Fence height shall be as specified by the Engineer but in no case shall exceed 36 inches above ground surface. 915- 3.02 Post Installation: Posts shall be set a minimum of 18 inches into the ground and spaced a maximum of 6 feet apart. Where an 18- inch post depth is impossible to achieve, the posts should be adequately secured to prevent overturning of the fence due to sediment loading and ponding pressure. 915- 3.03 Wire Support Fence: When wire support fence is used, the wire mesh shall be fastened securely to the upstream side of the post. The wire shall extend into the trench a mini mum of 2 inches and extend a minimum of 32 inches above the original ground surface. 915- 3.04 Geotextile Fabric Post Attachment: The geotextile fabric shall be attached on the upstream side of the posts by wire, cord, button head nails, pockets, staples, or other acceptable means. The geotextile fabric shall be installed in such a manner that 8 to 10 inches of fabric is left at the bottom to be buried. The fabric shall be installed in the trench such that 6 inches of fabric is against the side of the trench and 2 to 4 inches of fabric is across the bottom of the TABLE OF CONTENTS INDEX 1092 trench in the upstream direction. The trench shall then be backfilled and compacted so that no flow can pass under the barrier. A minimum overlap of 18 inches shall be provided at all splice joints with posts at the ends of each fabric roll. At the time of installation, the fabric will be rejected if it has defects, rips, holes, flaws, deterioration, or damage incurred during manufacture, transportation, storage or installation. 915- 4 Maintenance Requirements: 915- 4.01 Silt Fence Maintenance: The contractor shall be responsible to maintain the integrity of silt fences as long as necessary to contain sediment runoff in accordance with Subsection 104.09 of the specifications, or as directed by the Engineer. 915- 4.02 Sediment Deposit Removal: Sediment deposits shall be removed when the deposit reaches approximately one -half the height of the silt fence. The Engineer may also direct the contractor to install an additional silt fence. 915- 4.03 Fence Removal: The silt fence shall remain in place until the Engineer directs that it be removed. Upon removal, the contractor shall remove and dispose of any excess silt accumulations, grade the area to leave a generally smooth appearance, and plant vegetation in the areas specified in the contract documents. The fence materials will remain the property of the contractor and may be used at other locations provided the materials are in a condition acceptable to the Engineer. 915- 5 Method of Measurement: Temporary silt fence will be measured per linear foot. No allowance will be made for extra material used in overlapping at splice joints. Removal of sediment will be measured by the cubic yard. 915- 6 Basis of Payment: The accepted quantity of temporary silt fence, measured as provided above, will be paid for at the contract unit price per linear foot, complete in place, including all labor, materials, and equipment connected with placing the temporary silt fence as shown on the project plans or as directed by the Engineer. No payment will be made for rejected TABLE OF CONTENTS INDEX