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� <br /> - G3IGROUP �� <br /> � ; <br /> diameter injection holes through the concrete without damaging the <br /> structural integrity of the existing concrete element(s)and capable of <br /> installing'/z"injection probes to the required depths without damage shall be � <br /> used. i <br /> 3.4 Laser levels or dial indicator devices capable of monitoring movement I <br /> at the surface of the concrete shall be used. <br /> I <br /> 3.5 A portable probe rod or hand cone penetrometer approved by the Engineer I <br /> with relative density dial for on-site soils investigation to assist in location � <br /> of weak sub-base soils and determination of the injection pattern. <br /> i <br /> 3.6 All necessary equipment and materials,including but not limited to;electric <br /> generators,compressors,heaters,hoses,containers,valves and gauges to � <br /> efficiently conduct and control the work and minimize the impact to the '� <br /> existing structure shall be used. I, <br /> 4.0 Injection Material Requirements <br /> 4.1 The material used for placement under the concrete or structure shall be a i <br /> closed cell,hydroinsensitive,high-density polyurethane. �, <br /> 4.2 The material shall have a minimum free rise density of 3.O lbs./cubic ft and a <br /> minimum compressive strength of 38.0 psi. <br /> 43 The material shall have a maximum free rise density of 5.0 lbs./cubic ft. <br /> 4.4 The material used shall be a high-density polyurethane material as approved <br /> by the engineer. <br /> The material shall be a polyurethane-forming mixture that reacts in both dry <br /> and wet environments without dilution. <br /> 5.0 Injection Point Installation/Extraction <br /> 5.1 Contractor shall lay out the injection point locations for review by the <br /> Engineer,or his site representative. <br /> 5.2 Contractor shall provide a concrete profile from laser level measurements <br /> of each area where the concrete structures require attention. Each profile <br /> shall be accepted by the Engineer or his representative prior to perfornung <br /> the work at the project location. <br /> 53 Hand cone penetrometer testing should be conducted in the presence of the <br /> Engineer or his representative prior to injection,in order to confirm existing <br /> base soil conditions at representative locations within the treatment area. <br /> 5.4 Contractor shall install injection points through a series of 5/8"—3/4"holes <br /> (as required for tube placement)drilled at approacimately 4-6 foot spaced <br /> intervals through or adjacent to the concrete where indicated by the Engineer � <br /> based on soil conditions. ' <br /> � <br /> I I <br /> Florida Office: Phone: 727.376.7833 Tennessee Office: , <br /> 2410 Success Drive, Suite 7 Fax: 727-376-7433 45 Oak Valley Drive <br /> Odessa, FL 33556 Email: David.Harr cr,�eo3�roup.com Spring Hill, TN 37174 ; <br />� Web: www.�eo3�roup.com i <br />