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Mr. Sam Orlando <br /> September 11, 1997 <br /> The soil sample composites were analyzed by California Laboratory Services, Inc. of Rancho <br /> Cordova, California, for total petroleum hydrocarbons in the range of diesel fuel (TPHd) and in the <br /> range of gasoline (TPHg) using Environmental Protection Agency (EPA) Method 8015 modified <br /> and for the volatile organic compounds benzene, toluene, ethylbenzene, and total xylene isomers <br /> (BTEX)using EPA Method 8020. <br /> The results of the laboratory analyses indicated that only a residual concentration of possibly diesel <br /> fuel remained in three of the 50 cubic yard units (Table 1). The laboratory stated that the compound <br /> reported as TPHd in the three soil composites did not match the typical chromatographic fingerprint <br /> for diesel fuel (Appendix A). TPHg and the associated BTEX compounds were not detected at <br /> concentrations greater than the detection limits of the laboratory methods (Table 1). <br /> TABLE 1 <br /> LABORATORY RESULTS OF SOIL SAMPLE COMPOSITES <br /> SOIL AERATION STOCKPILE <br /> 5611 EAST WATERLOO ROAD, STOCKTON, CALIFORNIA <br /> Stockpiled Soil <br /> SAP 1 a-d <1.0 <0.005 <0.005 <0.005 <0.010 <1.0 <br /> SAP2a-d <1.0 <0.005 <0.005 <0.005 <0.010 <1.0 <br /> SAP3a-d <1.0 <0.005 <0.005 <0.005 <0.010 <1.0 <br /> SAP4a-d <1.0 <0.005 <0.005 <0.005 <0.010 6.2 <br /> SAP5a-d <1.0 <0.005 <0.005 <0.005 <0.010 3.5 <br /> SAP6a-d <1.0 <0.005 <0.005 <0.005 <0.010 9.9 <br /> Laboratory results of soil samples reported in milligrams/kilogram (Parts per million) <br /> TPHg = Total Petroleum Hydrocarbons in the range of gasoline <br /> TPHd= Total Petroleum Hydrocarbons in the range of diesel fuel <br /> <=Less than the laboratory method reporting limits <br /> It is our contention that the slightly elevated concentrations of apparently "weathered" diesel fuel <br /> detected in the soil sample composites will not pose a public health threat, if the soil is left in place <br /> at the site. Furthermore, these residual concentrations of"weathered" diesel fuel will continue to <br /> diminish by biological degradation and physical weathering,if left exposed at the surface of the site. <br /> GRAYLAND ENVIRONMENTAL <br /> Gmyland 022-131.ssc 2 <br />