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02 August 2018 <br /> AGE-NC Project No. 18-4471 <br /> Page 2 of 5 <br /> obtained through Underground Service Alert. The EHD will be contacted a minimum of <br /> 72-hours prior to conducting investigation activities to arrange for inspection. <br /> 2.2. DRILLING AND SAMPLING <br /> A total of five (5)-paired soil boring locations are proposed to assess potential <br /> contamination from off-site sources. Each sampling location will each consist of 3-paired <br /> soil borings that will be spaced less than 2-feet from each other (Figure 2). <br /> At each sampling location, the first soil boring will be advanced to 15 feet bsg for collection <br /> of 5-foot and 15-foot soil-vapor samples. The second soil boring will be advanced to 20 <br /> feet bsg for collection of 10-foot and 20-foot soil-vapor samples. The third soil boring will <br /> be advanced to a depth of approximately 50 feet for collection of a grab groundwater <br /> sample. <br /> Procedures for advancement of soil borings and sampling are presented in Section 3.0. <br /> 2.3. LABORATORY ANALYSIS <br /> Selected soil-vapor and grab groundwater samples will be analyzed by a California <br /> Department of Public Health (CDPH)-certified laboratory for the following constituents: <br /> • Total Petroleum Hydrocarbons (gasoline, diesel, motor oil) by EPA Methods <br /> 8015M or TO-15; and <br /> • Volatile organic compounds (VOCs) in accordance with EPA Methods 8260B or <br /> TO-15. <br /> • Per- and Polyfluoroalkyl substances (PFA's) in accordance with EPA Method 537. <br /> • Isopropyl Alcohol (IPA) in accordance with EPA Method TO-15. <br /> Laboratory reports for soil sample and groundwater 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 /> 2.4. REPORT PREPARATION <br /> Upon completion of initial field work and receipt of final laboratory analysis, a report will <br /> be prepared presenting findings of the investigation. The report of findings will include <br /> descriptions of work performed and results of sampling and analysis. Also, conclusions <br /> and applicable recommendations will be included in the report. Reports will be in a format <br /> Advanced GeoEnvironmental,Inc. <br />