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05 July 2007 <br /> AGE-NC Project No.03-1100 <br /> Page 2 of 9 <br /> and safety plan will be prepared in accordance with Occupational Safety and Health Guidance <br /> Manual for Hazardous Waste Site Activities(National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to <br /> mobilization,the area of excavation will be clearly marked and a utility clearance obtained through <br /> Underground Service Alert. IVY"3 1 <br /> o <br /> 2.2. CPT DRILLING AND SAMPLE COLLECTION <br /> AGE proposes to advance a p aof adjacent soil borings at the site for CPT and selected ground <br /> water and soil sampling,for the purposes of characterizing lithology,modeling potential contaminant <br /> migration pathways and assessing the vertical extent of hydrocarbon-impacted ground water.Based <br /> on the distribution of dissolved hydrocarbons encountered to date during the ongoing investigation, <br /> AGE proposes to advance the paired soil borings near the northeast corner of the former dispenser <br /> area (Figure 2). The first boring will be a cone penetrometer (CPT) bore; the CPT will acquire a <br /> continuous lithologic record to define the hydrologic units. The second boring will be advanced <br /> immediately adjacent to the first bore to acquire soil and grab ground water samples in targeted <br /> zones based on interpreted lithologic data and assessment needs. 'Prf 4 'gym •o- <br /> ja� <br /> 5�- �' � <br /> The borings will be advanced to approximately 100 feet bsg;the total depth of the boring may vary f � <br /> according to hydrogeologic conditions encountered during drilling activities. <br /> Ground water and selected soil samples will be analyzed by a California Department of Health <br /> Services (DHS)-certified laboratory for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified and, <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 /> i <br /> Laboratory reports for soil and ground water analysis, 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 /> Advanced GcoEnvironmental,Inc. <br />