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27 October 2005 <br /> AGE-NC Project No. 96-0235 <br /> Page 9 of 11 <br /> 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 a California <br /> Registered Geologist. Procedures for well installations, well development and ozone sparging are <br /> described below. <br /> 3.1. DRILLING AND SAMPLING <br /> A total of four Ozone injection sparge wells will be installed to a depth of 35 feet bsg utilizing a <br /> truck-mounted, hollow-stem drill rig and 8-inch diameter hollow-stem augers. Soil cuttings and <br /> rinseate generated during drilling activities will be containerized in properly labeled DOT-approved <br /> 55-gallon drums or equivalent, and stored on-site in an area lacking public access. Disposal <br /> alternatives for rinseate and stockpiled soil will be selected based on results of a laboratory analysis. <br /> Soil samples will be collected at five-foot intervals for logging purposes, beginning at a depth of <br /> 5 feet bsg. Selected soil samples may be analyzed by a DHS-certified laboratory for the following <br /> constituents: <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method 8015 <br /> Modified; <br /> • Benzene, toluene, ethylbenzene and total xylene (BTEX compounds) and methyl tertiary <br /> butyl ether(MTBE) in accordance with EPA Method 8020; <br /> • 1,2-Dichloroehene (1,2-DCA) by EPA Method 8260 Modified and <br /> • General Mineral (metals and anions)by appropriate EPA Methods 700 and 6010. <br /> Laboratory reports for soil analysis, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> 3.2. WELL COMPLETION <br /> Four soil borings will be advanced for the installation of ozone injection points. Following <br /> advancement of the soil boring,one manufacturer-assembled 2-inch by 30-inch microporous sparge <br /> point and casing will be installed in each boring; the sparge points will be installed at depths of <br /> Advanced GeoEnvironmental,Inc. <br />