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Jeanine Jones 2 September 23, 1986 <br /> Removing the concrete sump should eliminate the source of <br /> groundwater contamination. Comments on cleaning and replacing <br /> the sump backfill material will be reserved until a detailed <br /> explanation is provided. There is always the option of removal <br /> and disposal of the backfill material at a Class 1 landfill. <br /> Confirmation sampling and analysis in the sump area must be done <br /> for CrVI, in addition to coppet and lead. The soil analyses for <br /> CrVI must be done in accordance with SW-846. After removal of <br /> the concrete sump, the monitoring wells must be maintained and <br /> sampled quarterly with results submitted to this office. <br /> Depending on these results, future abandonment of the wells will <br /> be considered. <br /> MAR:jka <br />