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0 <br /> S CytoCulture international Inc. <br /> 249 Tewksbury Avenue, Pt RiChmonid, CA 94801 <br /> Lab 510-233-0102 Email lab c oculture corn <br /> Brian Pierskalla <br /> Clearwater Group <br /> 229 Tewksbury Avenue <br /> point Richmond, CA 94801 0 8,2003 <br /> Assessment of Intrinsic Bior+emediAt on Site Conditions at Barnes Trucking <br /> Facility <br />' 1817 S.Fresno Avenue, Stockton, <br /> Clearwater Project ZB 178C P.O.No 00008894 <br /> Site Conditions ? �� <br /> I <br /> The Barnes trucking facility site appears to have resid diesel el contamination in the <br /> vicinity of the former USTr,(removed in 1992)that co ' to leach petroleum <br /> Ihydrocarbons down-gradient. The steady source of dissolved phase petroleum <br /> hydrocarbons is kept in check by the growth of bacteria along the peripheral boundar1eS <br /> of the plume. In general, however,the TPH and BTEX concentrations have remained <br /> relatively stable within the confines of the plume as indicated from quarte dy <br /> data collected since the year 2000 Hence,the intrinsic bioremediation and other natural <br /> attenuation mechanisms appear to be keeping up with the source of hydrocarbons but the <br /> plume is not yet receding appreciably <br /> I Nutrient Levels <br /> 0 6 to 2.4 m and o-phosphate(0.1 to 2 8 mg1L) <br /> I <br /> Concentrations of ammonia nitrogen( are ��ng rapidly in monitoring wells are relatively low in most of the wells and they <br /> MW-1,MW-4 and MW-5B where hydrocarbon concentrations remain significant The <br /> nutrient depletion indicates biological activity(rates of metabolism)are now fast enough <br /> in these area that the utilization of these nutrients by bacteria may be overcoming the <br /> steady state recycling of the nitrogen and phosphorus within the biomass. In other words <br /> as air sparging and other site condition changes occur,the biological activity may <br /> contribute to the utilization or degradation of the available nutrients The pH of the <br /> Igroundwater was not measured <br /> Oxygen Levels <br /> Dissolved oxygen levels have varied considerably from year to year, and from quarter to <br /> quarter,but in general they consistently indicate <br /> et a groundwater <br /> match hose collected aerobic <br /> the <br /> concentrations measured in the laboratory do Y to <br /> field, lab measurements consistently indicated DO concentrations <br /> e monitoring e range <br /> ngeof ran 3 6 from <br /> 5 9 mg1L, where as field measurements(even <br /> 19 to 8 7 mg/L Field measurements should be lower(less atmospheric oxygen <br /> introduced)than lab measurements in general. <br /> I <br />