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Mr. Robert Mihalovich - 2 - 10 May 2001 <br /> 3. The,report states that for purposes of estimating the cost of enhanced in situ bioremediation ORC, <br /> Geomatrix assumed the following: (1)Annual groundwater monitoring would be performed and <br /> ORC.would be replaced an average of three times per year; and (2) Benzene concentrations in <br /> groundwater at the site are assumed to reach water quality objectives in about 15 years. <br /> The report should provide (1) the basis for the three times per year replacement of ORC and(2) <br /> justification for using 15 years as the time to remediate the site using ORC. <br /> Due to the uncertainties in the amount of ORC needed per year and the time to remediate in <br /> Alternative 3, Chevron should conduct a pilot study to obtain more concrete information so that a direct <br /> comparison with monitored NA can be made. Therefore, please submit by 8 June 2001, a work plan to <br /> conduct a pilot study using ORC. <br /> If you have any questions, you may call meat (916) 255-3398 or e-mail at isorenp@rb5s:swrcb.ca.gov. <br /> L , � <br /> -�Y-PHILIP ISORENA <br /> Associate Engineer <br /> cc: Ms!Margaret Lagorio, San Joaquin County Public Health Services, Stockton <br /> Mr.'James Simpson, Stanislaus County Department of Environmental Resources, Modesto <br /> Ms. Veenchee Foong, Geomatrix Consultants, Fresno, <br /> I. <br /> t <br /> i <br />