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31 August 2012 <br /> AGE Project No. 11 - 1847 <br /> Page 3 of 9 <br /> Based upon results of the initial investigation , additional borings may be advanced and <br /> sampled : <br /> i One boring will be advanced at the southern edge of the property to evaluate the <br /> potential upgradient lateral limits of adsorbed and dissolved hydrocarbon impact. <br /> • One boring will be advanced to the northeast of the former tank pit area to assess <br /> the potential downgradient lateral limits of adsorbed and dissolved impact. <br /> • One boring will be advanced northwest of the formertank excavation area to assess <br /> the potential downgradient/cross gradient lateral limits of adsorbed and dissolved <br /> i hydrocarbon impact. <br /> j Soil borings will be advanced to depths between 30 and 50 feet bsg or first-encountered <br /> groundwater; borings may be advanced to greater depths if contamination is encountered . <br /> Generally, soil samples will be collected from each boring at five-foot intervals . However, <br /> field personnel may adust the frequency and method of sampling in consultation with an <br /> AGE Professional Geologist. <br /> Grab groundwater samples will be collected from each soil boring during the initial phase <br /> of sampling . Grab groundwater will be collected from selected subsequent borings. <br /> Procedures for advancement of soil borings and sampling are presented in Section 3 . 0. <br /> 2 . 3 . LABORATORY ANALYSIS <br /> Selected soil samples and grab ground water samples will be analyzed by a California <br /> Department of Public Health (CDPH )-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with <br /> EPA Method 8015 Modified ; <br /> • Benzene , toluene, ethyl-benzene and total xylenes (BTEX) , di-isopropyl ether <br /> (DIPE) , ethyl tertiary-butyl ether (ETBE), methyl-tert-butyl-ether (MTBE), tertiary- <br /> amyl methyl ether (TAME), tertiary butanol (TBA) , ethylene dibromide (EDB) and <br /> 1 ,2-dichloroethane by EPA method 826013 ; <br />'I Total lead in accordance with EPA Method 60108 . <br /> Laboratory reports for soil sample and water analyses, testing methods , laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation <br />:i <br /> Advanced GeoEnvironmental, Inc. <br /> I <br /> lull <br /> 9 <br />