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Mr. Nuel Henderson, R.G January 31,2003 <br /> Installation of Ozone Injection System and Remediation Status Report <br /> Page 6 <br /> collected from this sampling event did not exhibit a consistent pattern of plate counts and <br /> nutrient concentrations, which correlate to petroleum hydrocarbon concentrations. <br /> Stratus will collect groundwater samples quarterly to evaluate the growth or reduction in <br /> microbial population corresponding to DO and petroleum hydrocarbon concentrations. <br /> Reporting <br /> The operation and maintenance details for the ozone injection system, which includes,but are not <br /> limited to, injection duration and cycle periods, field and analytical parameters, and evaluation of <br /> bioremediation parameters for petroleum hydrocarbon degradation will be presented in quarterly <br /> groundwater monitoring reports. The reports will also include standard groundwater monitoring <br /> data collected during quarterly groundwater sampling events. <br /> LIMITATIONS <br /> This report was prepared in general accordance with accepted standards of care that existed at the <br /> time this work was performed. No other warranty, expressed or implied is made. Conclusions <br /> and recommendations are based on field observations and data obtained from this work and <br /> previous investigations. It should be recognized that definition and evaluation of geologic <br /> conditions is a difficult an inexact art. Judgments leading to conclusions and recommendations <br /> are generally made with an incomplete knowledge of the subsurface conditions present. More <br /> extensive studies may be performed to reduce uncertainties. This report is solely for the use and <br /> information of our client unless otherwise noted. <br /> PABp-Arco for URS154691Reports\Arco 5469 Remediation Status Report.doc O TKArus <br />