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I, <br /> 18 November 1998 <br /> AGE-NC Project No. 98-0483 <br /> Page 5 of 7 <br /> Soil samples collected at 20 and 30 feet bsg from each of the four borings were selected for <br /> 'L. laboratory analysis. Soil samples were selected for laboratory analysis based on field_ observations <br /> and organic vapor meter (OVM) readings. All soil samples selected for laboratoryanalysis were <br /> approved by on-site PHS-EHD staff. <br /> L. <br /> Soil samples were submitted to McCampbell Analytical Inc. (MAI) in Pacheco,California. MAI is <br /> a State of California Department of Health Services (DHS)-certified laboratory. Each sample was <br /> I•. analyzed for: <br /> { TPH-d by EPA Method 8015 Modified/5030; <br /> TPH-mo by EPA Method 8015 Modified/5030;. <br /> • BTEX by EPA Method 8020; and <br /> • Fuel oxygenating compounds, including methyl-tertiary butyl ether(MTBE), tertiary-butyl <br /> alcohol(TBA),di-isopropyl ether(RIPE),ethyl tertiary-butyl ether(ETRE)and tertiary-amyl <br /> 1 methyl ether(TAME), by'EPA Method 8260. <br /> 4.0. FINDINGS <br /> Discussion of the shallow subsurface soil profile observed at the site,as well as soil analytical results <br /> are presented below. <br /> 4.1. SHALLOW SUBSURFACE SOIL PROFILE <br /> t.. <br /> In general, shallow subsurface soil at the site consists of clayey silt, silt, sandy silt, silty sand, and <br /> sand deposits from ground surface to 31 bsg,the total depth of the soil probe borings. Additionally, <br /> L, disturbed native soil and/or fill.material consisting of grey to dark grey clayey silt was observed in <br /> soil probe boring B-3 at approximately five feet bsg. Soil moisture content appeared dry to moist and <br /> Lr ground water was not encountered in any of the borings. No petroleum hydrocarbon discoloration, <br /> odor,or"OVM readings above background level were observed for soil samples collected from the <br /> four soil probe borings. Logs of the soil probe borings are presented in Appendix B. <br /> 4.2. SOIL ANALYTICAL RESULTS <br /> f <br /> A total of eight discrete soil samples collected from the four soil probe.borings were analyzed for <br /> petroleum hydrocarbon constituents,as discussed in Section 3.2.No detections of TPH-d, TPH-mo, <br /> BTEX and fuel oxygenates were reported in any of the soil samples analyzed. The laboratory <br /> analytical report is presented in Appendix C. <br /> Advanced GeoEnvironmcntal,Inc. <br />