1999-04-12_GENERAL DOCUMENTS - M1974052

• Permit No: M1974052
• IBM Index Class Name: General Documents
• Doc Date: 4/12/1999
• Doc Name: WORK PLAN VARRA COAL ASH BURIAL PROJECT WELD CNTY COLO CGRS 1-135-2755
• Media Type: D
• Archive: No

tCGRS,Inc. • •
WORK PLAN
' VARRA COAL ASH BURIAL PROJECT
WELD COUNTY, COLORADO
CGRS NO. 1-135-2755
t
' 1.0 INTRODUCTION
' This document presents the proposed work scope for the evaluation of coal ash burial in saturated
media. The field investigation will be performed in conjunction with a variety of laboratory studies
' in order to evaluate potential liabilities or benefits associated with coal ash burial. Specifically, this
project addresses issues associated with the reclamation of gravel quarries under saturated
conditions. A variety of laboratory experiments were conducted in order to evaluate coal ash
' leaching potentials for different pH ranges relative to effluent pore volume. The information ro
generated by this project will be invaluable to private companies or regulatory agencies insofar as
' evaluating under what conditions coal_ash can be placed without incurring significant liability. This
work is performed under the authorization of Varra Companies. The generation of this report was
' a joint effort between CGRS, Inc. and Colorado State University Groundwater Program (CSU).
' 1.1Obiectives
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The purpose of this project is to identify potential liabilities with the reclamation of gravel quarries I
' with coal ash and to determine if coal ash meets the criteria for classification as an inert fill I
Specific objectives for the Varra Coal Ash Burial Project are to determine:
' • Leaching characteristics of coal ash with respect to varying water quality conditions;
' • Permeabilities of various types of coal ash(bottom and fly ash);
• 0cts of coal ash burial on local hydrology and water quality;
• Hydrogeologic properties of coal ash; and
' • Physical characteristics of coal ash in saturated media.
1.2 Background Information
1.2.1 Local Geology/Hydrogeology
' The study area is an active gravel quarry located in the NW 1/4, Section 31, Township 3 North,
Range 68 West, 6" P.M., Weld County Colorado (Figure 1). The surficial geology of the area as
' I