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I <br /> i <br /> James Tjosvold <br /> Page 3 <br /> February 7, 1990 <br /> i <br /> The PCP concentrations in dust from air emissions were compared <br /> to known soil concentrations at the facility (below) . This was <br /> calculated using the weight of PCP trapped on the filter and the <br /> weight of particulate collected (Tables 3 and 4) . Calculations <br /> .indicate that the concentrations are too high to be generated <br /> from PCP stripped off dust and that PCP vapor is the major <br /> source. <br /> Hypothetical Scenario - All PCP vapor is from particulate. <br /> Concentrations calculated from Tables 3 and 4 . <br /> PCP-Particulate concentration (mg/kg) <br /> Location 1-Parking Lot 26, 000 <br /> 42 ,000 <br /> 29, 000 <br /> Location 2-Covered Storage 79, 000 <br /> 170, 000 <br /> Location 3-Pump House 480,000 <br /> 260, 000 <br /> 23 , 000 <br /> Site Characteristics - Additional soil characteristic testing was <br /> conducted. Soil moisture content was measured at 0. 4% and 1. 1%. <br /> A grain size distribution of the soil shown only 3% of the soil <br /> is less than 10 mm (microns) . Wind speed and direction data was <br /> collected both on the site and at Stockton Airport. The data is <br /> similar, but do not correspond exactly. <br /> Metal concentrations in the dust (below) were similar or higher <br /> than concentrations in soil samples which would be an upwind <br /> source. <br /> Contaminant Concentration in Dust <br /> Arsenic (mg/kg) Chromium (mg/kg) <br /> Inhalable Total Inhalable Total <br /> Location 1- <br /> Parking Lot 479 374 61 76 <br /> 193 655 90 56 <br /> Location 2- <br /> Cover Storage 299 116 56 66 <br /> <122 91 136 51 <br /> 20 66 12 30 <br /> Location 3- <br /> Pump House 270 239 62 101 <br /> 65 102 90 93 <br /> 75 237 77 48 <br />