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AdvancedGeo <br />Environmental <br />11 January 2019 <br />AGE Project No. 19-4606 <br />. Page 3 of 6 <br />Volatile organic compounds, including naphthalene, in accordance with EPA <br />method 8260B. <br />Laboratory reports for soil sample and water analyses, testing methods, laboratory <br />quality assurance/quality control (QA/QC) reports, and sample chain-of-custody <br />documentation will be presented in a report with the findings and recommendations. <br />2.3. SOIL-VAPOR SAMPLING & ANALYSIS <br />To evaluate vapor intrusion risk to the site building a total of four (4) borings will be <br />advanced in selection locations adjacent to borings advanced for soil and grab <br />groundwater sample collection. Borings will be advanced to total depths of 6.5 feet bsg. <br />Semi-permanent soil-vapor sampling wells will be installed and then later sampled <br />following a minimum two-hour stabilization period. Procedures for installation and <br />sampling of the proposed soil-vapor sampling wells are provided in Section 3.3. <br />Proposed boring locations are illustrated in Figure 1. <br />2.4. REPORT PREPARATION <br />Upon completion of field work and receipt of final laboratory analysis, a report will be <br />prepared presenting the findings of the investigation. The report will include a <br />description of the work performed and results of the sampling and analysis. <br />Conclusions, applicable recommendations and maps will be included in the report. The <br />report will be reviewed and signed by a California Professional Geologist. <br />3.0. FIELD PROCEDURES <br />All field procedures will be overseen by an AGE representative under the supervision of <br />a California Professional Geologist. Procedures for the advancement of the soil borings <br />and soil-vapor sampling well installation and sampling are outlined below. <br />3.1. SOIL BORING ADVANCEMENT AND SOIL SAMPLING <br />Soil borings will be advanced using a van mounted Geoprobe 5400 direct-push probing <br />unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings <br />using a hydraulic hammer to drive soil and groundwater sampling tools to specified <br />depths. Borings for soil-vapor sample collection will be advanced utilizing a four-inch <br />diameter hand auger. <br />Soil samples will be collected for laboratory analysis from all six proposed borings <br />during the investigation. Soil samples will be collected at discrete five-foot intervals