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05 July 2007 <br /> AGE-NC Project No.03-1100 <br /> Page 3 of 9 <br /> 2.3. SOIL BORING DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance four pilot soil borings at the site for installation of one ground water <br /> monitoring well and three ozone sparging points, using a truck-mounted, hollow-stem drill rig <br /> equipped with 8.25-inch hollow-stem augers to advance the well borings to approximately 50 feet <br /> bsg for the monitoring well and 6�feet bsg for the ozone sparging wells;the total depth of each well <br /> boring may vary according to by rogeologic/geologic conditions encountered during drilling. <br /> Well MW-8 will be installed east of monitoring well MW-2. Ozone sparge points OZ-4 will be <br /> installed southwest of MW-3,west of the former dispenser area,OZ-5 will be installed southeast of <br /> SVE-3, and OZ-6 will be installed east of the former dispenser area, west-southwest of MW-1. <br /> Proposed monitoring well locations are illustrated on Figure 2. <br /> Soil samples will be collected from within the 8.25-inch hollow-stem augers at five-foot intervals <br /> using a California split-spoon sampler and brass sleeves. Selected soil samples Ak k r ported <br /> under chain of custody procedures to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services (DHS)-certified laboratory and analyzed for: <br /> • TPH-g in accordance with EPA Method 8015 Modified; <br /> • Benzene, toluene, ethyl benzene and total xylene (BTEX) and oxygenated compounds: di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br /> (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260. <br /> Laboratory reports of both soil and ground water 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_ <br /> 2.4. MONITORING WELL INSTALLATION, DEVELOPMENT AND SURVEY <br /> One pilot boring will be completed as single-level ground water monitoring well using 20-feet of <br /> well screen; AGE anticipates the well at the site to be screened from 30 to 50 feet bsg. Following <br /> installation, the well will be developed to maximize water flow and minimize the amount of fine- <br /> grained sediment drawn into the well during pumping or bailing, and the top of each existing and <br /> newly installed well casing(well head) will be surveyed to determine its elevation relative to mean <br /> sea level.Procedures for well installation,development and survey are presented in Sections 3.2.and <br /> 3.3., respectively. <br /> Advanced GeoEnvironmental,Inc. <br />