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22 October 2021 <br />Project No. 21-6639 <br />Page 2 of 3 <br />through Underground Service Alert (USA/811). The EHD will be contacted at least 72 <br />hours prior to conducting investigation activities to coordinate a grout inspection. <br /> <br /> <br />2.2. SOIL BORING ADVANCEMENT AND SAMPLING <br /> <br />AGI proposes to advance four (4) soil borings at the site utilizing a van-mounted <br />Geoprobe 5400 direct-push probing unit (or equivalent) equipped with 1.45-inch diameter <br />probing rods. The Geoprobe advances soil probe borings using a hydraulic hammer to <br />drive sampling tools to specified depths. <br /> <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 /> <br />Grab groundwater samples will be collected from each boring. A Geoprobe (or similar) <br />push-driven water sampling device will be advanced into the water-bearing zone. <br />Samples will be collected using a Geoprobe water sampling assembly fitted with a pre- <br />cleaned, one-inch diameter 0.01-slotted temporary well screen. The screen will be <br />removed upon completion of sampling. <br /> <br /> <br />2.3. SOIL AND GROUNDWATER LABORATORY ANALYSIS <br /> <br />Selected soil and grab groundwater samples may be submitted to an appropriately <br />certified laboratory for analysis. Analysis shall be performed at the sole discretion of AGI. <br /> <br /> <br />2.4. BORING ABANDONMENT <br /> <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 72 hours prior to conducting grouting procedures. <br /> <br /> <br />2.5. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> <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