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Page 2 <br /> Chromium <br /> Arsenic Copper (total) <br /> Monitoring Well mg/1 m 1 mg/1 <br /> 206 0 . 002 <0 . 001 20 - 990 <br /> 213 0 . 004 <0 . 001 84 - 140 <br /> 214 0 . 004 <0 . 001 8 . 7- 50 <br /> Additional samples from monitoring wells and lysimeters <br /> near the Pond will be analyzed for copper and arsenic the week of <br /> July 11, 1988 during the Quarterly Monitoring Program. These con- <br /> centrations found in the retort area wells are below the lowest <br /> NPDES permit limits for the Water Treatment Plant of 0 . 010 mg/1 <br /> for arsenic and 0 . 0065 mg/l for copper. <br /> These NPDES limits have been set primarily for those periods <br /> when storm waters are being treated since surface runoff contains <br /> these constituents to a measurable extent. <br /> The available soil data show attenuation of relatively in- <br /> soluble wood treating chemicals in the soils immediately beneath <br /> the Pond. Phase I data were graphically presented in our letter <br /> dated May 17 , 1988 . Certain archived Phase II soil samples will <br /> be analyzed to corroborate or supplement the existing database. <br /> The Surface Impoundment Closure Plan will be revised as <br /> necessary to reflect the recommended alternative resulting from <br /> the Analysis. The Plan will then be resubmitted for Agency re- <br /> view and public comment. Closure activities will commence after <br /> receipt of an approved closure plan. A milestone schedule suggest- <br /> ed by DHS for these activities is presented as follows: <br /> Engineering and Environmental Analysis August 1, 1988 <br /> report completed <br /> Surface Impoundment Closure Plan August 1, 1988 <br /> revisions completed <br /> Implementation of Closure Activities September 1, 1988 <br /> To follow such an ambitious and optimistic schedule will <br /> require close coordination of our technical advisors, our con- <br /> struction forces and all regulatory agencies. To accomplish this <br /> a draft copy of the Engineering and Environmental Analysis and <br /> a marked-up copy of the Closure Plan will be sent to you by July <br /> 22 . A meeting would need to be scheduled for July 26 to resolve <br /> any differences and the final draft on August 1 as shown. <br />