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I1 I June 2004. ; • , ;AGE-NC Project No. 95-0106 ; :Page.4 of b - - .. : � _ .. ., . r • , Two soil samples,one from the uppermost,fine-grained layer and one from the underlying sand and- gravel layer, were collected from soil borings 'B 18 and'B 17, respectively, and analyzed for properties. The fine=grained sample,-collected from 5 feet bsg at boring B18, was , ',.geotechnical _ 'described as a mottled brown cla and cla e sand,.:with 40%, orosi acid'a low,organic content -`` I Y . Y Y ° P tY'' '(1:5%). The'sand sample, collected from 15 feet bsg'in boring B17, was described as a dark gray sand with 33.9% porosity and love organiccontent (0.5%). The geotechnical laboratory reports (Cooper Testing Lab.ID#255-031),and chain-of-custody forms are included in Appendix C. Lines ' of cross section,are illustrated on Figure 2 and geologic cross.sections'are depicted on Figures 3 and-4._ 1 " 3.2. ANALYTICAL RESULTS•OF SOIL SAMPLES' Irthe contaminants listed in S ection 2.4.TPH- and various Seventeen loll samples were analyzed for m� � g . BTEX compounds were detected in samples B 17-5,B 18-10 and B20-8,:at maximum concentrations of 15 milligrams per kilogram (mg/kg)TPH=g (B20--8), 0.52 mg/kg benzene (B 18-10), 0.18 mg/kg . ' ' toluene (B17-5), 0.24 mg/kg ethylbenzene (B17-5) and.2.15 mg/kg xylenes (B17-5); xylenes was ,also detected in sample B 1 b-5.5"at 0.006 mg/kg g tt The fuel additive MTBE was detected in the four soil samples analyzed from borings B17 and B181, at'a maximum concentration of 0.29'mgikg(B 17-5), MTBE was detected in soil samples collected' ' from total depth in both borings, at.a concentration of 0.012 mg/kg., No other target analytes were detected in the samples analyzed. Soil'samplc'analytical•results are summarized in ,Table 1. 'The laboratory ry .reports (CTEL Lab ,ID 'CT214-0308117 and CT214-0306069),quality assurance and quality control(QA/QC),and'chain-of-custody'are included in Appendix D. F, 3:3:" MASS-VOLUME CALCULATIONS: Based .ori'Figures 3 'through 5,.the mass.'and volume,for gasoline-impacted soil, equations was determined utilizing Autocad-drawing program-determined area multiplied by the thickness,which. ' -was averaged across- 5-foot-lateral increments on cross'sections: Theapparent Aotal volume of gasoline-impacted soil totaled approximately 6969allons of.gasoline,,or an estimated 4,352 pounds ' of gasoline.remaining in soil. Mass-volume calculations are included in Appendix E. �. Advanced Geolrnvironmental,Inc.