1998-12-31_GENERAL DOCUMENTS - M1974052

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999 December 29, 1998 Glenn F. Mallory Colorado Department of Public Health and Environment (CDPHE) Hazardous Materials and Waste Management Division 4300 Cherry Creek Drive South RF_CENED Denver, CO 80246-1530 DEC 311998 RE: Varra Coal Ash Project Weld County Colorado wn of Minerals&Geology CGRS No. 1-135-2755 Dear Mr. Mallory: ti Enclosed please find the draft work plan for the Varra Coal Ash Burial Project. Please note that while the work plan describes in detail the laboratory testing methods and proposed field work, the work plan does not include analytical results or a discussion of analytical results as all of the results have not been received. When all results have been received and tabulated a final work plan will be submitted to all interested parties for review. The work plan is being submitted as a draft in hopes that the time required for review will be lessened once the final draft has been submitted. 'A' 1 have included a summary of analytical results available t this time (Table 2). The results are for water samples obtained form the Sequential Extraction Leaching Procedure (SELP), which is described in detail in the work plan. This test should represent the maximum leaching capability of a material, as it is an agitated extraction test. A review of analytical results shows that none of the samples exceeded hazardous waste characteristic levels. In addition, as a general trend, second extraction results were lower than initial extraction analyses. Aluminum and iron were the analytes most prevalent in exceeding primary or secondary drinking water standards. It is our belief that the non-agitated column leaching test will be most indicitative of field conditions and comparisons of pore volume Flow through verses concentration will be made to access possible adverse impacts to waters of the State.