Laserfiche WebLink
Jeanine Jones 2 January 17, 1986 <br /> o The presence of contamination in the drainage ditches <br /> indicates that chromium, copper and arsenic have <br /> migrated off-site. This signifies the need to <br /> implement run-off control measures on-site. A workplan <br /> for providing drainage control must be submitted for <br /> our review. <br /> o The retort pit is the major source of contamination to <br /> the soil and to the groundwater under the Marley site. <br /> In the next phase of remedial investigation the soil <br /> and groundwater efforts should, be -coordinated, keeping <br /> in mind all possible remedial alternatives that may be <br /> considered for the retort pit area. All interim <br /> measures taken in the retort pit, such as the hypalon <br /> lining, are temporary measures only. The contaminated <br /> soil beneath the pit is a continuing source of <br /> contamination to the groundwater. <br /> Groundwater Report <br /> o A second phase groundwater investigation is necessary <br /> to define the full extent of contaminant migration, <br /> including off-site sampling which might require <br /> installation of off-site monitoring wells. The area to <br /> be investigated off-site is shown on the attached map. <br /> o Marley is installing 6 on-site wells in addition to <br /> those listed in the Groundwater Assessment Report. DHS <br /> should be provided with an update of this added <br /> activity, including sample results when they become <br /> available. <br /> o Copies of actual lab analysis results for groundwater <br /> samples should be provided, the same as for the soil <br /> sample results. <br /> The second phase of the remedial investigation should include a <br /> preliminary look at possible mitigation alternatives and the <br /> additional studies which may be required to consider those <br /> alternatives. <br /> MAR:jka <br /> Attachment <br />