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05 March 2024 AdvancedGeo <br /> An Employee—owned Company <br /> Project No. 23-7172 <br /> Page 2 of 3 <br /> 2.2. SOIL BORING ADVANCEMENT AND SAMPLING <br /> AGI proposes to advance ten (10) soil borings at the site utilizing a truck-mounted <br /> Geoprobe 5400 direct-push probing unit equipped with 1 .45-inch diameter probing rods. <br /> The Geoprobe advances soil probe borings using a hydraulic hammer to drive sampling <br /> tools to specified depths. Soil Samples will be collected at 5-foot intervals bsg to total <br /> depth. Grab groundwater samples will be collected from three undetermined borings. <br /> Upon reaching total depth, all proposed soil sampling borings will be converted into dual- <br /> completed soil-vapor sampling points. Soil-vapor sampling points will be installed at <br /> depths of 5 and 15 feet bsg. All soil-vapor samples will be collected with Summa (vacuum) <br /> canisters. <br /> Soil samples will be collected at selected depths from each boring using a 1.45-inch <br /> Geoprobe soil sampling assembly. Field screening of soil samples shall be performed <br /> using an organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre- <br /> calibrated to isobutylene. <br /> 2.3. SOIL, GROUNDWATER, AND SOIL-VAPOR LABORATORY ANALYSIS <br /> Selected soil, groundwater, and soil-vapor samples may be submitted to an appropriately <br /> certified laboratory for analysis. Analysis shall be performed at the sole discretion of AGI. <br /> 2.4. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. The top three to six inches of the boring abandonments will <br /> be completed flush to surface grade with concrete or native material. The EHD will be <br /> notified for grout inspection at least 48 hours prior to conducting grouting procedures. <br /> 2.5. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. Any soil or water waste generated during <br /> field activities will be containerized in properly labeled DOT-approved drums and stored <br /> on-site in an area generally lacking public access. Disposal alternatives will be evaluated <br /> based on results of soil and/or water analysis. If you have any questions or require further <br /> information, please contact our office at (800) 511-9300. <br /> Sincerely, <br /> AdvancedGeo, Inc. <br /> �I <br />