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09 October 2013 <br /> AGE- NC Project No , 11 - 1847 <br /> Page 2 of 5 <br /> (National Institute for Occupational Safety and Health Administration , U . S . Coast Guard <br /> and U .S . Environmental Protection Agency, 1985 ) . Prior to mobilization , each proposed <br /> boring/well locations will be clearly marked and a utility clearance obtained through <br /> Underground Service Alert, <br /> 2 .2 . DRILLING AND SAMPLE ANALYSIS <br /> AGE proposes to advance three pilot soil borings to depths of 45 feet bsg for the <br /> installation of a shallow groundwater monitoring well network. Soil borings will be advanced <br /> using a truck-mounted drill rig equipped with 8 .25-inch hollow-stem augers . The total depth <br /> of each well boring may vary according to geologic/hydrogeologic conditions encountered <br /> during drilling . Locations of the groundwater monitoring wells are as follows: <br /> • One pilot boring/monitoring well will be advanced 10 feet south of boring GW-6 and <br /> 15 feet west of currently installed well MW- 1 to evaluate the "core" area of the <br /> hydrocarbon plume ; <br /> • One pilot boring/monitoring well will be advanced in the presumed downgradient <br /> direction approximately 90 feet northeast of well Mto establish gradient <br /> direction and evaluate hydrocarbon impact to groundwater downgradie t of the <br /> source area ; and <br /> • One pilot boring/monitoring well will be advanced approximately 125 feet southeast <br /> of well MW- 1 and adjacent to boring GW- 10 to establish gradient direction and to <br /> j evaluate hydrocarbon impact to groundwater. <br /> The proposed soil boring and monitoring well locations are illustrated on Figure 2. <br /> Selected soil samples will be analyzed by a State of California Department of Public Health <br /> (CDPH )-certified laboratory for the following constituents : <br /> Total petroleum hydrocarbons quantified as gasoline(TPH-g ) in accordance with <br /> EPA Method 8015M ; and <br /> • Benzene , toluene , ethylbenzene , and total xylenes (BTEX) and fuel additives methyl <br /> tertiary-butyl ether (MTBE), tertiary-butyl alcohol (TBA) , di- isopropyl ether (DIPE), <br /> ethyl tertiary-butyl ether (ETBE) , tertiary-amyl methyl ether (TAME ), 1 ,2- <br /> dibromoethane ( EDB), and 1 ,2-dichloroethane ( 1 ,2-DCA) in accordance with EPA <br /> Method 8260B . <br /> Laboratory reports of soil analysis , testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in <br /> Advanced GeoEnvironmental, Inc. <br />