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Hunterwood Park-CS090722Page 1 of 1 Keith Marvin - Hunterwood Pocket Park From: "Kyle Whitis" <kwhitis(�pkce.com> To: <jelias(�'.&i.coppell.tx.us> Date: 7/22/2009 5:15 PM Subject: Hunterwood Pocket Park CC: <kmarvingci.coppell.tx.us >, "Jim Koch" <jkochgpkce.com >, "Bernard Brandon" <bbrandongpkce.com >, "Clark, Joel" <jclarkgcraigoldeninc.com> Attachments: Hunterwood prelim Details.pdf; Hunterwood prelim Sections.pdf; Hunterwood prelim .pdf Mr. Elias, wanted to follow up from my voice message that I left for you earlier, we are currently working on and should be completing our first draft of the erosion study late next week. I was wondering if you would like to sit down the week of August 3rd to go over the first draft of the study and our schematic design of the permanent erosion protection in the two areas near the park. I've attached copies of our current erosion protection schematic design for your review so you can get an idea what it is we are proposing right now. Please give me a call at your convenience and we can discuss, Kyle F. Whitis, PE, LEED® AP Senior Project Manager PACHECO KOCH Consulting Engineers 8350 N. Central Expressway, Suite 1000 Dallas, Texas 75206 -1612 (972) 235 -3031 — Office (214) 578 -2286 — Mobile kwhitis @pkce.com file: HC: \Documents and Settings \radloo \Local Settings\ Temp \XPgrpwise \4A674948City_o... 9/16/2010 1.0 DESCRIPTION: 1.1 Gabion structures consist of rectangular, compartmented, woven wire mesh baskets filled with stone used to build earth retaining and erosion control structures such as: retaining walls, channel linings, headwalls and flexible aprons for pipes, slope protection, bridge revetments and weirs. 2.0 MATERIALS: 2.1 Gabions shall be prefabricated in accordance with ASTM A975 -97 to the size called for on the plans, or as otherwise approved. Gabions shall consist of galvanized wire or galvanized wire with an additional PVC coating woven into a uniform, hexagonal- shaped double twist pattern with openings approximately 3 -1/4" x 4 -1/2 ". The mesh shall be fabricated in such a manner as to be non - raveling and to provide the required flexibility and strength. All wire used for gabions, including lacing wire, shall have a tensile strength of 54,039 P.S.I. to 68,259 P.S.I. in accordance with ASTM A641 -98, Class 3, soft temper. The zinc coating shall meet the requirements of ASTM A641 -98, Class 3, soft temper coating and shall be a minimum quantity of 0.70 oz /ft2 for wire 0.087' in diameter, 0.80 oz/ft2 for wire 0.106" in diameter, 0.85 oz/ft2 for wire 0.120" and 0.134" in diameter and 0.90 oz/ft2 for wire 0.150" in diameter. Wire used for galvanized overlapping rings shall be 0.120" diameter wire per ASTM A641 -98 with a tensile strength of 230,000 P.S.I. to 273,000 P.S.I. per ASTM A764 -95. Wire used for stainless steel overlapping rings shall be 0.120" diameter stainless steel wire per ASTM A313 -98, Type 302, Class I with a tensile strength of 222,000 P.S.I. to 253,000 P.S.I. Mesh wire, selvedge wire and lacing wire diameters for galvanized gabions and galvanized gabions with a PVC coating shall be in accordance with the nominal diameters as listed in Table 1. Tolerances of all wire diameters shown shall be +/- 0.004 ". All testing of wire diameters shall be prior to fabrication. TABLE 1- NOMINAL GABION WIRE DIAMETERS Galvanized Wire Galvanized Wire with PVC Coatin Mesh Wire 0.120" US 11 gauge) 0.106" US 12 gauge Selved a Wire 0.150" US 9 gauge) 0.134" US 10 gauge Lacing Wire 0.087" US 13 -1/2 gauge) 0.087" US 13 -1/2 gauge Polyvinyl Chloride (PVC) used to coat gabion wire shall meet the following specifications: Color - gray; Nominal Thickness - 0.020 inches; Minimum Thickness - 0.015 inches; UV Resistance - 3000 hours using apparatus Type E when tested according to ASTM D1499 and ASTM G23; Salt Spray Test - 3000 hours when tested according to ASTM B117; Abrasion Resistance - weight loss not more than 12% according to ASTM D1242. The PVC coating shall be uniformly applied and shall be free from cracks, splits, stretched or stressed areas. Assembled gabions will form a rectangular unit with a minimum thickness of twelve inches (12 "). The base and sides are to be woven into a single unit. The bottom of the end panels shall be factory connected to the body in such a manner that the strength and flexibility at the point of connection is approximately equal to that of the mesh. The lid for specially fabricated gabions may be separate construction. The gabion shall be divided into cells of approximately equal size by factory connected diaphragm panels using mesh of the same type and gauge as the body of the gabion. The diaphragm panels shall be secured in proper position on the base in such a manner that no additional tying is necessary. The length of the cell shall not exceed its horizontal width. All perimeter edges of the wire mesh forming the body, end and diaphragm panels shall have a heavier gauge selvedge wire woven into the edge of the mesh panel. All cut edges of the mesh panels forming the body, tops of ends and diaphragms shall be securely attached to a heavier gauge selvedge wire by a minimum of two complete turns of the wire mesh around the selvedge wire. Lacing wire shall be supplied for securely fastening the gabions during all steps of assembly and construction. Lacing wire shall be included with the gabions in sufficient quantity for tying gabions in accordance with the specifications. No other wire except of the type supplied with the gabions may be used. High tensile overlapping rings may be used as an alternate fastening method in place of the tie wire lacing method when used in accordance with these specifications. Galvanized rings shall be used for galvanized gabions; stainless steel rings shall be used for PVC coated gabions. Interlocking fasteners and spiral fasteners may not be used. Gabions furnished by a manufacturer shall be of uniform size and subject to dimension tolerance limits of +/- 5 %. The gabions shall be certified by a notarized, sworn affidavit from the manufacturer showing compliance with the specification requirements. 2.2 Gabion Rock used to fill the gabions shall be clean, hard, durable, 4" to 8" well - graded crushed limestone. Not more than 15% of the rock (by weight) shall pass a 4" opening. For 12" gabions, 4" to 6" well - graded crushed limestone may be used. The rock shall be clean and shall be stored and handled in a manner to prevent contamination. Prior to placing the rock, samples shall be delivered to site and shall be approved for gradation and appearance by the engineer. 2.3 Geotextile Fabric for use as a filter media, when specified on the plans, shall be placed along the gabion structure as shown in the plans. The fabric to be used shall be: Mirafi 140N or approved equal. 2.4 Granular Filter Media, when specified on the plans, shall be placed to the limits as shown on the plans. Granular filter media shall consist of crushed stone in accordance with ASTM C33, Size 57 (1" minus). 3.0 CONSTRUCTION: 3.1 General - The gabions shall be installed in accordance with the size, type, and alignment as shown on the plans. PVC coated gabions shall be used in the areas as specified and shown on the plans. The placement of the gabions shall be in close conformity to the lines and grades shown on the plans and shall be in strict accordance with these specifications. 3.2 Geotextile Fabric Placement - After excavation to the subgrade elevation has been performed, the geotextile fabric (when specified) shall be placed to the limits as shown on the plans. Care shall be taken not to place the fabric in a manner exceeding the limits shown on the plans. Where splices occur, adjacent pieces of geotextile shall be overlapped a minimum of eighteen inches (18 "). Fabric shall be secured, when necessary, by pins or other suitable means before placing the gabions. Excess fabric protruding past the finished gabions shall be cut off. 3.3 Gabion Assembly - Gabions are assembled in the following steps: (1.) Unfold the baskets on a hard, flat surface and stamp out all kinks. (2.) Fold up the front, back, and end panels and fasten the panels together with the projecting heavy gauge selvage wire by twisting the selvedge wire around the selvedge wire of the other panel two complete turns. (3.) Fold the inner diaphragm panels up and secure in the same manner. (4.) Tie all edges of the diaphragms and end panels to the sides of the gabion by the tying method as specified below. 3.4 Tying Method -PROPER TYING OF GABIONS AT ALL STEPS IN THE ASSEMBLY AND CONSTRUCTION OF THE GABION STRUCTURE IS CRITICAL TO THE PERFORMANCE OF THE FINISHED GABION STRUCTURE. 1. Gabions must be tied in the specified manner at each step of construction: a) Initial assembly b) Tying to adjacent gabions along diaphragms all contacting edges c) Tying of lid to sides d) Tying of lid to top of e) Re -tying of cut gabions 2. All tying of gabions shall be performed in the following manner (See Figure 1 - attached): (1.) Cut a length of lacing wire approximately five feet long. (2.) Secure the lacing wire onto the gabion at the end by looping and twisting the tie wire together. (3.) Proceed tying with double loops (made at the same point) every five inches apart. The basket pieces should be pulled tightly together during the tying operation. (4.) Secure the other end of the lacing wire by again looping and twisting the wire around itself. No other wire except of the type supplied with the gabions may be used for tying the gabions. 3. Overlapping rings may be used as an alternate to the specified lacing wire method where at least one -half inch ( ") overlap of the rings can be made. Spacing of the rings shall not exceed six inches (6 "). In the event a one -half inch (�/2 ") overlap of the ring cannot be obtained, such as end -to -end attachment of gabions, the specified lacing wire method shall be used. 3.5 Gabion Placement - After each gabion has been assembled, it shall be placed in position empty and shall be tied to adjacent gabions along all contacting edges in order to form a continuously connected structural unit. 3.6 Filling Gabions -IT IS CRITICAL TO THE PERFORMANCE OF THE FINISHED GABION STRUCTURE THAT GABIONS ARE FILLED TO THEIR MAXIMUM DENSITY WITH VOIDS IN THE GABION MINIMIZED. When the assembled empty gabions have been installed and tied together, the gabions shall be filled in the following manner: 1. The gabions may be filled by machine, but shall be filled in layers or lifts not exceeding twelve inches (12 "). Care shall be taken when placing the rock into the gabions to insure that the gabions are not damaged or bent. Do not drop rock from a height greater than three feet (3'). Suitable sized and appropriate machinery will help prevent damage to the gabions during the filling operation. Edges of gabions and diaphragms may be protected when necessary by tying steel reinforcement to the edges of the gabions or other suitable guard mechanisms to prevent damage or deformation of the gabions. 2. After a twelve inch (12 ") layer of rock has been placed in the cell, sufficient hand manipulation for the rock shall be performed to minimize voids and result in a maximum density of rock in the gabion. 3. Gabions that are three feet (3') high shall have a looped inner tie wire installed in each cell connecting the front and back faces of any unsupported or exposed face at the vertical third points, or 12" and 24" from the base of the gabions (See Figure 2 - attached). Individual cells may not be filled to a height greater than twelve inches (12 ") above any adjacent cell unless looped inner tie wires are installed in both directions. Gabions that are eighteen inches (18 ") high that are installed with an exposed outer face such as a retaining wall shall have a looped inner tie wire installed connecting the front and back faces. The inner tie shall be installed at half the vertical height or 9" from the base of the gabion. Individual cells may not be filled to a height greater than nine inches (9 ") above an adjacent cell unless looped inner tie wires are installed in both directions. Inner tie wires are not required for 18" gabions installed as mattress applications. 4. Each gabion shall be filled to its maximum density, which is slightly higher than the sides and the surface smoothly leveled minimizing voids. 3.7 Closing Gabions - After the rock has been leveled, the lids shall be pried down and over with a bar or lid closing tool until the edge of the lid and the edge of the gabion are together. Care shall be taken so that the mesh is not deformed. It should require a light stretching in order to bring the two gabion pieces together. The heavy projecting selvage wire of the lid shall then be twisted around the heavy selvage wire on the sides two (2) complete turns. The lid shall then be tied to the sides of the gabions and the tops of the diaphragms in the specified tying method. The lids of the gabions shall also be tied to adjacent gabions along all contacting edges to insure the formation of a continuous, connecting structural unit. Special attention shall be given that all projecting sharp ends of wire are turned in on the completed gabion structure. 3.8 Cutting Gabions - Gabions may be cut to form curves or bevels. Overlap the cut pieces and re -tie in the specified manner. Re -tying shall be in a manner so as to produce a closed cell when completed. Excess mesh wire shall be cut off or shall be tightly and neatly laced down. Care shall be taken that all projecting wire ends are turned inwards or cut off. 4.0 QUALITY CONTROL 4.1 Proper tying of gabions during all steps of construction and gabions being filled to their maximum density with a minimum amount of voids is critical to the performance of the finished gabion structure. Therefore, compliance with the technical specifications will be closely and thoroughly inspected. Any work not meeting the implied quality will be rejected. 5.0 MEASUREMENT AND PAYMENT 5.1 Measurement of gabion structures shall be based on the volume in cubic yards of gabions installed and filled to their maximum density with a minimum of voids and shall include the volume of embedded items when applicable. Gabion structures shall be paid for at the contract unit price per cubic yard. The unit price shall include full compensation for placing all materials (gabions, rock, geotextile and/or granular filter media) and for furnishing all tools, labor, equipment, and other incidentals necessary to complete and install the gabion structure in accordance with the intent of the plans and specifications. 5.2 Excavation and site preparation will be paid for separately. NOT FOR CONSTRUCTION GABIONS MUST BE TIED IN THIS MANNER AT EACH STEP OF CONSTRUCTION: 1. INITIAL ASSEMBLY 2. TYING TO ADJACENT GABIONS ALONG ALL CONTACTING EDGES 3. TYING OF LID TO SIDES 4. TYING OF LID TO ALL DIAPHRAGMS 5. RE -TYING OF THE CUT GABION FIGURE 1: TYING METHOD I TIE WIRES INNERTIE WIRES SHALL BE PLACED HORIZONTALLY IN EACH GABION CELL EVERY 12" OF VERTICAL HEIGHT CONNECTING THE FRONT (EXTERIOR) AND BACK (INTERIOR) FACES AND ANY UNSUPPORTED FACE LENGTHWISE. FIGURE 2: TIE WIRE INSTALLATION METHOD GABION TYING DETAILS SCALE: N.T.S. THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF INTERIM REVIEW UNDER THE AUTHORITY OF JOEL R. CLARK, P.E. 85414 ON 07/10/09. 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SCALE : 1 " = 5" PoK 6 GpN 14" CEDAR • w J WOOD BRIDGE ss, 0 RIM= 503.68' FL (SE)= 496.1' FL (NW)= 496.2' BM# 3 " ❑X " CUT SET ON A CURB INLET 470 FEET NORTH OF BETHEL ROAD, 50 FEET WEST OF THE CENTERLINE OF FREEPORT PARKWAY ELEV= 513.88 BM# A " ❑ "CUT SET ON THE SOUTHWEST CORNER OF A CURB INLET BEING ON THE EAST END OF CUL -DE -SAC ON HEATH LANE AND MOBLEY WAY. ELEV= 505.94 ANDERSON COURT • 18" PECAN 12" CEDAR 14 EDAR 12" PECAN \ 14" CEDAR \ / INLET= 503.16' / FL 18 "= 498.8' INLET / HUNTERWOOD PARK PLAN VIEW SCALE: V= 10' 9" BOIS D'ARC W cr - � NOT FOR CONSTRUCTION THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF INTERIM REVIEW UNDER THE AUTHORITY OF JOEL R. CLARK, P.E. 85414 ON 07/10/09. IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING OR PERMIT PURPOSES.