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I. INTRoouCTION <br /> • Three soil samples from the Thorpe Oil site were received on November 11, 1881 and <br /> assessed for the feasibility of using biological treatment as an effective method for soil <br /> remediation The soil was subjected to tests which Included soil characterization, <br /> microbial enmeration, soil respirometno test and TPH analysle(both by IR method and <br /> GC/FID). <br /> II SOIL CHARACTSRISTICS <br /> Three representative soils from the site were analyzed for the various parameters which <br /> affect petroleum hydrocarbon degradation In the soil. These analysis Included water <br /> holding capacity, soil density, total organic matter, nitrogen, phosphorous, and sell pH. <br /> The results obtained are summarized in Table 1. <br /> The Thorpe Oil soil is a densely packed silty material, with signs of clay, of light to <br /> medium brown color with a high water holding capacity, The soil becomes very clay-like <br /> upon the addition of excess water (20-30%) and therefore, difficult to mlx. The soil <br /> shows no visible signs of contamination(le etatning) but has a strong odor of light <br /> petroleum hydrocarbons. The corresponding TPH readings were low Indicating either <br /> loss due to volatilization of contaminant, biodegradation or weathering. The results also <br /> Indicated that Thorpe Oil sod was phosphorous and nitrogen limited and further <br /> supplement of nutrients will be needed for bloremedlation. The soil samples have pH <br /> within the optimum range and no adjustment will be required Initlalty for bioremediation <br /> since most of the soil microorganisms are known to grow and actively metabolize <br /> • petroleum hydrocarbons at the range of pH detected. <br /> TABLE 1: NUTR15NT CHARACTERISTICS <br /> Parameters SMPL #1 SMPL #3 SMPL #5 <br /> Moisture Content(%) 970+005 10.67 10.87 <br /> Water Holding Cap. NA 29.87 NA <br /> N <br /> Soil Density (glcm� NA 1.13 NA <br /> Total Organic Matter 1.82 1,88 2.27 <br /> N <br /> pH 6.6 6.8 8.8 <br /> 1204-P(ppm-dry) 18112 20110 85114 <br /> average 16+42 1517.1 18.517.8 <br /> Total NEtrogen(ppm- 410 470 950 <br /> dry) <br /> NH4-N(ppm-dry) 44 48 36 <br /> . NOTE: NA = Not Available <br /> 1 <br /> T a _ H03J__I0 W3H3,= Wd60•b0 T6. TT 73Q <br />