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' 04 April 1997 <br /> AGE-NC-95-0112 <br /> ' Page 2of5 <br /> 22 LOGGING <br /> ' <br /> Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br /> ' using a photo-ionization detector (PID Thermo Environmental 580A, 10 OeV, calibrated to <br /> isobutylene), and the readings were recorded on the boring logs Soil was described in accordance <br /> with the Unified Soil Classification System (see Boring Logs, Appendix A) <br /> 23 SAMPLE ANALYSIS <br /> ' A total of eleven soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and volatile aromatic compounds (benzene, toluene, ethylbenzene and xylenes BTE&X) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA methods 8015m and 8020, <br /> respectively Four soil samples were submitted to Cooper Testing Laboratory in Mountain View for <br /> physical/geotechnical analyses, samples P4-30 and P4-55 were analyzed for organic content <br /> ' Samples P4-35 and P4-50 were analyzed for dry weight density and porosity Due to the nature of <br /> the soil types and small sample tube diameter, permeability analysis could not be performed <br /> 24 PETROLEUM HYDROCARBONS IN SOIL <br />' The estimated mass of petroleum hydrocarbons in soil beneath the former UST location was <br /> calculated from data collected prior to and after remediation Cross section A-A' was plotted from <br />' near MW-5, southwest of the former UST location, to near MW-4, toward the northeast (Figure 2) <br /> A generalized stratigrapluc cross section was constructed using data from all borings advanced near <br /> the cross-sectional line Analytical results from soil samples collected prior to remediation were used <br /> to estimate the mass of hydrocarbons in soil before initiation of vapor extraction at the site (Figure <br /> 3) Analytical results of soil samples collected after remediation was initiated were used to estimated <br /> the remaining mass of hydrocarbons in soil at the site (Figure 4) <br />' Thelume was divided into section a <br /> p s based on analytical results of soil samples The soil volume and <br />' average TPH-g concentration for each section was then estimated A density of 1 83 grams per cubic <br /> centimeter or 1399 kilograms per cubic yard of soil was used in calculations (see section 3 3 } The <br /> total mass of hydrocarbons was calculated by adding the calculated mass from each section <br /> 1 <br /> 1 <br />