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Mr. Robert Doss <br /> June 20, 1997 <br /> page 2 <br /> conservative assumptions were used in the modeling approach, an inherent <br /> uncertainty is associated with the selected excavation intervals. Therefore, <br /> verification sampling will be an important component of soil remediation and <br /> should be briefly discussed in Section 6.1.1 - Soil Areas and volumes requiring <br /> remediation. In addition, modeling results of remaining soils should be presented <br /> to clearly demonstrate objectives would be met. Important information for <br /> remaining soil/polygons would include: concentrations, contaminant intervals, peak <br /> contaminant contributions to groundwater, time of arrival of peak contribution, <br /> etc. <br /> 5. Section 6.1.2.1 and Section 7 present retained soil and residue technologies and <br /> chnologies respectively for remediation. Retained <br /> retained groundwater te <br /> ess and use restrictions, excavation of soil treatment <br /> technologies include accbe implied, as a g and n <br /> of extracted groundwater. These appear to <br /> included in <br /> rrojecting a dsections theefo a must be included e plici lyhe FS. These e n the development, <br /> for the P applicable. All remaining <br /> discussion, and recommendation of alternatives where <br /> ail to <br /> nclude each of the technology <br /> alternatives should ou be discussed in h final dispositiontof thel <br /> through <br /> material. <br /> components thg <br /> a monitoring program consisting of two years of quarterly <br /> 6• page 7 5 proposes <br /> groundwater monitoring followed by semi-annual monitoring. This program <br /> event every year for five years to measure <br /> includes one enhanced ameters.monitoringThe adequacy of the proposed monitoring <br /> intrinsic remediation p ends quarterly <br /> program can only be determined after sufficient data has been collected and steady <br /> until sufficient data has been collected to support a reduced <br /> state conditions have been achieved. DTSC therefore reco handling, field/lab enhanced monitoring rotocols for collecting, <br /> monitoring program. The specific p parameters should be developed and <br /> testing, and interpreting intrinsic remediation n of page 7-5 refers to the DTSC <br /> submitted as part of the FS. The bottom p ro ram which would be more <br /> position on the intrinsic remediation monitoring p g <br /> accurately stated as: <br /> The <br /> of the intrinsic remediation monitoring <br /> he following are the goals and objective <br /> program• aterally and vertically) <br /> To provide documentation of the stability and reduction (l <br /> of the groundwater contaminant plume, eochemical conditions in <br /> biodegradation ntrinsic <br /> Provide additional evtdeand to demonstrate that i <br /> demonstrating 8 <br /> groundwater are appropriate <br /> ate for <br /> bioremediation is 0 groundwater plume is not eXpadilume expands. <br /> I Document the gr plan i the groundwater contaminant p <br /> Trigger'a contingency p f FAl <br /> Fge-f <br /> I FA law <br /> FgeG 1<t <br /> I <br /> FA-law <br /> P9.4-Jet <br />