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Paul Franzia - 2 - 14 October 2003 <br /> Vadose Zone Monitoring Portion of the Workplan <br /> f <br /> • It is unclear why all the vadose monitoring data will be collected from LAA No. 5. The water <br /> balance presented in Table 2 includes all the LAAs. Please describe why vadose zone monitoring <br /> should only occur in LAA 5. <br /> • Please provide drawings of the basin lysimeter design and the suction lysimeter design. <br /> • Section 3.1.2 describes a sampling frequency that is adequate to provide data for the Effluent <br /> Limitation Determination Technical Report but does not state what the frequency will be. Please <br /> describe the sample collection frequency. <br /> • Section 3.1.3 describes installation of the backfill material at permeability values close to the original <br /> soil before excavation. Please describe how that will be accomplished. <br /> • Section 3.2 describes installation of suction lysimeters at various depths depending on soil texture <br /> changes. Please describe the type of soil that is targeted for the installation. <br /> • Table 3 presents the analyte list for samples collected from the suction lysimeters. Please provide an <br /> evaluation of the amount of sample that will be collected and the required sample volume for the <br /> analyses that are proposed. If inadequate sample volume is collected will additional sample be <br /> collected later or will some analyses be cancelled? <br /> In order to meet the proposed installation schedule, by 21 October 2003, please submit a workplan <br /> addendum addressing the above comments. If you have any questions on this information, please <br /> telephone me at (916) 255-3116. <br /> TIMOTHY f. 0'BRIEN <br /> Waste Discharge to Land Unit <br /> cc.: Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> Robert Chrobak, Kennedy Jenks Consultants, San Francisco <br /> VASan_Joaquin_Noal 5lSwfll0bricnTISan JoaquimBarrel Tcn Escalon WinffOranzia 9 Oct 03.doc <br />