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ATTACHMENT B <br /> MODIFICATIONS <br /> TO <br /> MARLEY COOLING TOWER COMPANY�S <br /> WORK PLAN FOR MITIGATION ACTIVITIES <br /> DATED <br /> MARCH 14, 1988 <br /> Page 2-2 First Paragraph; <br /> Comment- <br /> It is the Department' s view that installation <br /> of the Hypalon liner may have only reduced the <br /> infiltration of liquids into underlying soil rather <br /> than "prevent any further migration" as stated. <br /> The work plan should therefore lie revised to <br /> indicate this possibility and to note that the <br /> ultimate site remediation will require a permanent <br /> solution for the retort pit. <br /> Page 3-5 Add the following to list of potential <br /> exposure routes ; <br /> 4) Direct dermal contact with groundwater. <br /> Page 3-25 Add the following to bullet items ; <br /> o Potential leaching of contaminants into <br /> groundwater. <br /> Page 4-1 Section 4 . 1. 1; <br /> First paragraph, first sentence- <br /> Add zinc to list of constituents found to be above <br /> background levels. <br /> Second paragraph- <br /> Revise to include the following additional <br /> requirements for samples collected around the <br /> perimeter of the north yard. <br /> Excluding N-8 , locations N-5 through N-9 <br /> shall be sampled at 5 feet below land surface and <br /> every 5 feet thereafter until groundwater is <br /> encountered. These samples along with all north <br /> yard samples scheduled for analysis (Table 4-1) , <br /> shall be submitted for determination of total <br /> chromium, hexavalent chromium, copper, and arsenic <br /> concentrations . Sample moisture content must also <br />