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_ 'r ' 29 September,1998.... AGE-NC Project No. 98-0492 Page 3-of b Safety and Health Administration, U.S: Coast Guard d U.S. Environmental Protection Agency, 1985). Prior to mobilization,each soil probe location wi11-be clearly marked and an,utility clearance _ obtained through Underground Service Alert.' 3.2. SOIL SAMPLE-COLLECTION ANI)i ANALI SIS Initially,AGE proposes to advance six soil probe borin gs in the vicinity.of the fuel USTs-to evaluate if a release of petroleum hydrocarbon has,occurred oil the site in the past five years.The probe borings will be advanced at.a-.20 to 25 degree-angle un' er each'end of each UST. Proposed probe boring locations are illustrated in Figure 2.. All probe borings are proposed to be advanced'to 20 feet bs' _ However,-total depths ofprobe borings will be based on field observations and feld screening sing an organic vapor monitor(OVM). Soil samples will be collected from each probe-boring at fiv =foot intervals beginning at 5 feet bsg.to the total depth. Field procedures for advancement'of prob .borings and collection of soil samples are presented in Section 4.2. A_f.least one sample fiom each_. robe boring will be submitted for laboratory' . analysis. Selected soil samples will be analyzed by a State-ofCalifornia-Department of Toxic Substances Control (DTSC)-certified.laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015:Modified; • Volatile aromatics(benzene, toluene;ethyl.-be ne and xylenes; BTEX)in accordance with EPA Method 8020;'and Fuel oxygenates including methyl tertiary-butyl ther(MTBE);tertiary-butyl alcohol.(TBA) , di-isopropyl ether(DIPE), ethyl tertiary-butyl,a her (ETBE) and tertiary-amyl methyl ether (TAME) in accordance with EPA Method 8260. ;Laboratory reports'for soil analyses, testing methods, laboratory,quadity assurance/quality control . (QA/QC) reports,-.and.sample .chain of custody documentation will be presented in' a report with findings and recommendations. 3.3.. GROUND WATER-SAMPLE COLLECTION AND ANALYSI S- During the,soil assessment.activities, if groundwater is encountered, samples will be,collected. . ground water samples will be collected two orin soil bg will'be.used to collect ground water,at least : Advanced GcoEnvironmental;Inc.