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19 November 2007 <br /> AGE-NC Project No. 05-1306 <br /> Page 3 of 7 <br /> 2.3. WELL INSTALLATION, DEVELOPMENT AND SURVEY <br /> Following drilling of the boreholes, a monitoring well will be installed in each borehole. After <br /> installation, the wells will be developed to maximize water flow and minimize the amount of fine- <br /> grained sediment drawn into the well during pumping, and the location and well-head elevation of <br /> each well will be surveyed by a state licensed surveyor. Procedures for well installation, <br /> development, and survey are presented in Sections 3.2 and 3.3, respectively. <br /> 2.4. GROUND WATER SAMPLING AND ANALYSIS <br /> Following installation,the new wells will be incorporated into ContiGroup Companies, Inc. ground <br /> water monitoring program; monitoring and sampling will be conducted on all the monitoring wells <br /> on a quarterly basis. Ground water sample collection and analytical protocols are described in AGE- <br /> prepared quarterly monitoring reports dating back to second quarter 2005,and are in accordance with <br /> the EHD's Recommended Groundwater Sampling Guidelines, dated 15 February 1995. <br /> 2.5. SOIL BORING AND SOIL-VAPOR SAMPLE COLLECTION <br /> AGE proposes to advance four soil-vapor probe borings to assess the potential for intrusion of <br /> petroleum hydrocarbon-impacted soil-vapor to indoor air. Each soil boring will be advanced to a <br /> depth of 5 feet bsg for collection of a soil-vapor sample. The soil-vapor samples will be analyzed <br /> by a State of California Department of Health Services(DHS)-certified laboratory for the following <br /> constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015M; <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX), and naphthalene in accordance with <br /> EPA Method 8260B; and <br /> • Isopropyl alcohol in accordance with EPA Method 8015M. <br /> Field procedures for advancement of borings and collection of soil vapor samples are presented in <br /> Section 3.4. Laboratory reports for soil vapor analyses, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be <br /> presented in a report with findings and recommendations. <br /> Advanced GeoEnvironmental,tne. <br />