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.July 17, 1996 �"' "'w <br /> Paee 3 <br /> One mechanism for plume stabilization at the site may be natural biodegradation. In order <br /> to ascertain the presence of aerobic and anaerobic biodegradation, Chevron has submitted <br /> a request to initiate the collection of biodegradation indicator parameters at representative <br /> wells. Electric conductivity, pH, and temperature are currently recorded and will continue <br /> to be measured to determine whether favorable conditions exist for the occurrence of <br /> biodegradation. Dissolved oxygen will also be measured to determine the presence of <br /> aerobic biodegradation. <br /> Additionally, groundwater will be analyzed for oxidation reduction potential (field meter), <br /> sulfite (EPA Method 377.1), sulfate, nitrate, and nitrite (EPA Method 300.0); and ferrous <br /> iron (EPA Method 200.7). These constituents will be measured to determine whether <br /> anaerobic biodegradation is occurring. <br /> In summary, the parameters listed here will provide evidence as to the occurrence of <br /> aerobic and/or anaerobic biodegradation. Evidence of biodegradation would provide one <br /> mechanism for the stability of dissolved petroleum hydrocarbons beneath the site. <br /> If there are any questions regarding the contents of this letter report, please call. <br /> Sincerely, <br /> Pacific Environmental Group, Inc. <br /> Mark D. ullivan \S��RED 6Fp�Oc <br /> Project Engineer <br /> Q MICHAEL HURD <br /> No. 0068 <br /> CE,;fIFIED <br /> HYDROGLOLOGIST <br /> Michael Hulo <br /> 419 <br /> Senior Geologist J'j EXP' <br /> CHG 0068 4Tf of <br /> Attachments: Table I - Well Summary <br /> Figure 1 - Site Map <br /> 3201357C/CAPADD <br />