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08 March 2005 <br /> AGE-NC Project No. 02-0962 <br /> Page 5 of 9 <br /> 3.2. DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance three pilot soil borings at the site for the installation of shallow ground <br /> water monitoring wells. Using a CME-75HT truck-mounted drill rig equipped with 8.25-inch <br /> hollow-stem augers,the pilot borings will be advanced to a depth of 60 feet bsg. The total depth of <br /> each well boring may vary according to geologic/hydrogeologic conditions encountered during <br /> drilling. Proposed locations of the pilot soil borings, illustrated on Figure 2, are as follows: <br /> • One boring will be advanced approximately 20 feet north of existing monitoring well MW-1; <br /> • One boring will be advanced approximately 25 feet south-southwest of monitoring well <br /> MW-1, near the property boundary; and <br /> • One boring will be advanced approximately 30 feet southeast of monitoring well MW-1. <br /> Selected soil samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified; <br /> • BTEX and fuel additives DIPE, ETBE, MTBE, TAME, TBA, EDB, and 1,2-DCA in <br /> accordance with EPA Method 826013; and <br /> • Total lead in accordance with EPA Method 6010. <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 of findings and recommendations. <br /> 3.3. MONITORING WELL INSTALLATION, DEVELOPMENT, AND SURVEY <br /> The three pilot soil borings will be completed as single-level ground water monitoring wells screened <br /> from 40 feet to 60 feet bsg. Following installation,each well will be developed to maximize water <br /> flow and minimize the amount of fine-grained sediment drawn into the well during pumping or <br /> bailing. The top of the existing and newly installed well casings (well heads) will be surveyed to <br /> determine their elevation relative to mean sea level. <br /> Advanced GeoEnvironmental,Inc. <br />