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19 March 2004 <br /> AGE-NC Project No. 02-0886 <br /> Page 4 of 8 <br /> clearance obtained through Underground Service Alert. <br /> 3.2. DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance up to three soil borings at the site for the collection of soil samples and <br /> completion of ground water monitoring wells.A truck-mounted,hollow-stem drill rig equipped with <br /> 8.25-inch hollow-stem augers will be utilized to advance the borings to approximately 70 feet bsg; <br /> the total depth of each well boring may vary according to hydrogeologic/geologic conditions <br /> encountered during drilling. Initially,one boring will be advanced immediately north of the former <br /> dispenser island area.If necessary,two additional borings will be advanced near the former UST area <br /> and southwest of the former dispenser area. <br /> During the first phase of work,one soil boring will be advanced,sampled and completed as a ground <br /> water monitoring well. Two additional soil borings will be completed as ground water monitoring <br /> wells if sampling of the first well indicates the presence of petroleum hydrocarbons in ground water. <br /> Soil samples for laboratory analysis will be selected based on visual observations of petroleum <br /> hydrocarbon impact, organic vapor meter (OVM) readings, changes in lithology, and/or at the <br /> capillary fringe. Selected soil samples will be analyzed by a State of California DHS-certified <br /> laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 3550/8015 Modified; and <br /> • Benzene, toluene, ethyl benzene and total xylene (BTEX) and di-isopropyl ether (DIPE), <br /> ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl <br /> ether (TAME), tertiary butanol (TBA), methanol, ethanol, ethylene dibromide (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260. <br /> Laboratory reports of soil analyses, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> 3.3. MONITORING WELL INSTALLATION, DEVELOPMENT AND SURVEY <br /> Each soil boring will be completed as a single-level ground water monitoring wells screened from <br /> approximately 50 to 70 feet bsg. Following installation, each well will be developed to maximize <br /> water flow and minimize the amount of fine-grained sediment drawn into the well during pumping <br /> or bailing,and the top of each existing and newly installed well casing(well head)will be surveyed <br /> to determine its elevation relative to mean sea level. Procedures for well installation, development <br /> Advanced GeoEnvironmental,Inc. <br />