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31 May 2023 AdvancedGeo <br /> Project No. 23-7208 An Employee-Owned Company <br /> Page 2 of 4 <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection <br /> Agency, 1985). Prior to mobilization, each soil probe boring location will be clearly <br /> marked, and a utility clearance obtained through Underground Service Alert (USA/811). <br /> The EHD will be contacted at least 72 hours prior to conducting investigation activities to <br /> coordinate a grout inspection. <br /> 2.2. SOIL BORING ADVANCEMENT, SAMPLING AND ANALYSIS <br /> All borings shall be advanced utilizing hand tooling or a truck-mounted Geoprobe 5400 <br /> direct-push probing unit equipped with 1.25-inch diameter probing rods. The Geoprobe <br /> advances soil probe borings using a hydraulic hammer to drive sampling tools to specified <br /> depths. <br /> Soil samples will be collected at selected depths from each boring using a 1.25-inch <br /> Geoprobe soil sampling assembly. Upon sample retrieval, a selected portion of the liner <br /> will be cut, and the ends will be covered with Teflon sheets, capped, and sealed with tape. <br /> Soil sample duplicates may be screened in the field using an organic vapor meter (OVM), <br /> equipped with photo-ionization detector (PID) pre-calibrated to isobutylene. Samples <br /> shall be transported under chain-of-custody procedure to a for analysis, where <br /> appropriate. <br /> Selected soil samples may be analyzed by a laboratory for Total Petroleum Hydrocarbons <br /> (TPH), RCRA 8 Metals, Volatile Organic Compounds (VOCs) and/or Polychlorinated <br /> Biphenyls (PCBs). The number of samples and analytes shall be at the sole discretion of <br /> AG I. <br /> 2.3. SOIL VAPOR POINT INSTALLATION, SAMPLING AND ANALYSIS <br /> A vapor probe shall be emplaced in each 5-foot boring for the collection of a soil vapor <br /> sample. Upon reaching total boring depth (5 feet bsg), approximately three (3) inches of <br /> #2/12 sand will be placed at the bottom of the borehole for a '/4-inch diameter, 2-inch-long <br /> polyethylene soil-vapor implant and 7 feet of '/4-inch Teflon® tubing to be placed upon. <br /> The filter pack of #2/12 sand will continue to be added to approximately 3.75 feet bsg. <br /> Following placement of the filter pack, approximately 12 inches of dry granulated <br /> bentonite will be placed atop the filter pack to 2.75 feet bsg. The remaining space will be <br /> sealed with hydrated bentonite to near surface grade. <br /> Following soil-vapor point installations, a minimum 2-hour stabilization period will be <br /> observed prior to sample collection. A one-liter Summa canister and 60ml purge syringe <br /> will be connected with a dedicated and serialized sampling inlet manifold to the vapor <br /> point tubing. The sampling inlet manifold will consist of an air/vapor-tight valve; a <br /> particulate filter; a flow restrictor calibrated to 150 milliliters per minute (ml/min), a <br /> stainless-steel tee-fitting, two vacuum gauges at either end of the controller and <br />